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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 | ||
24 | #include <net/genetlink.h> | |
25 | #include <linux/nfc.h> | |
26 | #include <linux/slab.h> | |
27 | ||
28 | #include "nfc.h" | |
29 | ||
30 | static struct genl_multicast_group nfc_genl_event_mcgrp = { | |
31 | .name = NFC_GENL_MCAST_EVENT_NAME, | |
32 | }; | |
33 | ||
34 | struct 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 | ||
42 | static 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 | ||
49 | static 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 | ||
71 | nla_put_failure: | |
72 | genlmsg_cancel(msg, hdr); | |
73 | return -EMSGSIZE; | |
74 | } | |
75 | ||
76 | static 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 | ||
101 | static 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 | ||
138 | static 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 | ||
150 | int 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 | ||
174 | nla_put_failure: | |
175 | genlmsg_cancel(msg, hdr); | |
176 | free_msg: | |
177 | nlmsg_free(msg); | |
178 | return -EMSGSIZE; | |
179 | } | |
180 | ||
181 | int 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 | ||
207 | nla_put_failure: | |
208 | genlmsg_cancel(msg, hdr); | |
209 | free_msg: | |
210 | nlmsg_free(msg); | |
211 | return -EMSGSIZE; | |
212 | } | |
213 | ||
214 | int 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 | ||
238 | nla_put_failure: | |
239 | genlmsg_cancel(msg, hdr); | |
240 | free_msg: | |
241 | nlmsg_free(msg); | |
242 | return -EMSGSIZE; | |
243 | } | |
244 | ||
245 | static 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 | ||
268 | nla_put_failure: | |
269 | genlmsg_cancel(msg, hdr); | |
270 | return -EMSGSIZE; | |
271 | } | |
272 | ||
273 | static 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 | ||
318 | static 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 | ||
330 | static 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 | ||
363 | out_free: | |
364 | nlmsg_free(msg); | |
365 | out_putdev: | |
366 | nfc_put_device(dev); | |
367 | return rc; | |
368 | } | |
369 | ||
370 | static 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 | ||
402 | static 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 | ||
429 | out: | |
430 | mutex_unlock(&dev->genl_data.genl_data_mutex); | |
431 | nfc_put_device(dev); | |
432 | return rc; | |
433 | } | |
434 | ||
435 | static 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 | ||
461 | static 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 | ||
488 | out: | |
489 | return NOTIFY_DONE; | |
490 | } | |
491 | ||
492 | void 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 | ||
498 | void nfc_genl_data_exit(struct nfc_genl_data *genl_data) | |
499 | { | |
500 | mutex_destroy(&genl_data->genl_data_mutex); | |
501 | } | |
502 | ||
503 | static 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 | */ | |
512 | int __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 | */ | |
533 | void nfc_genl_exit(void) | |
534 | { | |
535 | netlink_unregister_notifier(&nl_notifier); | |
536 | genl_unregister_family(&nfc_genl_family); | |
537 | } |