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 * Vendor commands implementation based on net/wireless/nl80211.c
9 * which is:
10 *
11 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
12 * Copyright 2013-2014 Intel Mobile Communications GmbH
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see <http://www.gnu.org/licenses/>.
26 */
27
28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
29
30 #include <net/genetlink.h>
31 #include <linux/nfc.h>
32 #include <linux/slab.h>
33
34 #include "nfc.h"
35 #include "llcp.h"
36
37 static const struct genl_multicast_group nfc_genl_mcgrps[] = {
38 { .name = NFC_GENL_MCAST_EVENT_NAME, },
39 };
40
41 static struct genl_family nfc_genl_family = {
42 .id = GENL_ID_GENERATE,
43 .hdrsize = 0,
44 .name = NFC_GENL_NAME,
45 .version = NFC_GENL_VERSION,
46 .maxattr = NFC_ATTR_MAX,
47 };
48
49 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
50 [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
51 [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
52 .len = NFC_DEVICE_NAME_MAXSIZE },
53 [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
54 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
55 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
56 [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
57 [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
58 [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
59 [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
60 [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
61 [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
62 [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
63 [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
64 .len = NFC_FIRMWARE_NAME_MAXSIZE },
65 [NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
66 [NFC_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
67
68 };
69
70 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
71 [NFC_SDP_ATTR_URI] = { .type = NLA_STRING },
72 [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
73 };
74
nfc_genl_send_target(struct sk_buff * msg,struct nfc_target * target,struct netlink_callback * cb,int flags)75 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
76 struct netlink_callback *cb, int flags)
77 {
78 void *hdr;
79
80 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
81 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
82 if (!hdr)
83 return -EMSGSIZE;
84
85 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
86
87 if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
88 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
89 nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
90 nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
91 goto nla_put_failure;
92 if (target->nfcid1_len > 0 &&
93 nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
94 target->nfcid1))
95 goto nla_put_failure;
96 if (target->sensb_res_len > 0 &&
97 nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
98 target->sensb_res))
99 goto nla_put_failure;
100 if (target->sensf_res_len > 0 &&
101 nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
102 target->sensf_res))
103 goto nla_put_failure;
104
105 if (target->is_iso15693) {
106 if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID,
107 target->iso15693_dsfid) ||
108 nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID,
109 sizeof(target->iso15693_uid), target->iso15693_uid))
110 goto nla_put_failure;
111 }
112
113 genlmsg_end(msg, hdr);
114 return 0;
115
116 nla_put_failure:
117 genlmsg_cancel(msg, hdr);
118 return -EMSGSIZE;
119 }
120
__get_device_from_cb(struct netlink_callback * cb)121 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
122 {
123 struct nfc_dev *dev;
124 int rc;
125 u32 idx;
126
127 rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
128 nfc_genl_family.attrbuf,
129 nfc_genl_family.maxattr,
130 nfc_genl_policy);
131 if (rc < 0)
132 return ERR_PTR(rc);
133
134 if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
135 return ERR_PTR(-EINVAL);
136
137 idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
138
139 dev = nfc_get_device(idx);
140 if (!dev)
141 return ERR_PTR(-ENODEV);
142
143 return dev;
144 }
145
nfc_genl_dump_targets(struct sk_buff * skb,struct netlink_callback * cb)146 static int nfc_genl_dump_targets(struct sk_buff *skb,
147 struct netlink_callback *cb)
148 {
149 int i = cb->args[0];
150 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
151 int rc;
152
153 if (!dev) {
154 dev = __get_device_from_cb(cb);
155 if (IS_ERR(dev))
156 return PTR_ERR(dev);
157
158 cb->args[1] = (long) dev;
159 }
160
161 device_lock(&dev->dev);
162
163 cb->seq = dev->targets_generation;
164
165 while (i < dev->n_targets) {
166 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
167 NLM_F_MULTI);
168 if (rc < 0)
169 break;
170
171 i++;
172 }
173
174 device_unlock(&dev->dev);
175
176 cb->args[0] = i;
177
178 return skb->len;
179 }
180
nfc_genl_dump_targets_done(struct netlink_callback * cb)181 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
182 {
183 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
184
185 if (dev)
186 nfc_put_device(dev);
187
188 return 0;
189 }
190
nfc_genl_targets_found(struct nfc_dev * dev)191 int nfc_genl_targets_found(struct nfc_dev *dev)
192 {
193 struct sk_buff *msg;
194 void *hdr;
195
196 dev->genl_data.poll_req_portid = 0;
197
198 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
199 if (!msg)
200 return -ENOMEM;
201
202 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
203 NFC_EVENT_TARGETS_FOUND);
204 if (!hdr)
205 goto free_msg;
206
207 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
208 goto nla_put_failure;
209
210 genlmsg_end(msg, hdr);
211
212 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
213
214 nla_put_failure:
215 genlmsg_cancel(msg, hdr);
216 free_msg:
217 nlmsg_free(msg);
218 return -EMSGSIZE;
219 }
220
nfc_genl_target_lost(struct nfc_dev * dev,u32 target_idx)221 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
222 {
223 struct sk_buff *msg;
224 void *hdr;
225
226 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
227 if (!msg)
228 return -ENOMEM;
229
230 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
231 NFC_EVENT_TARGET_LOST);
232 if (!hdr)
233 goto free_msg;
234
235 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
236 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
237 goto nla_put_failure;
238
239 genlmsg_end(msg, hdr);
240
241 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
242
243 return 0;
244
245 nla_put_failure:
246 genlmsg_cancel(msg, hdr);
247 free_msg:
248 nlmsg_free(msg);
249 return -EMSGSIZE;
250 }
251
nfc_genl_tm_activated(struct nfc_dev * dev,u32 protocol)252 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
253 {
254 struct sk_buff *msg;
255 void *hdr;
256
257 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
258 if (!msg)
259 return -ENOMEM;
260
261 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
262 NFC_EVENT_TM_ACTIVATED);
263 if (!hdr)
264 goto free_msg;
265
266 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
267 goto nla_put_failure;
268 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
269 goto nla_put_failure;
270
271 genlmsg_end(msg, hdr);
272
273 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
274
275 return 0;
276
277 nla_put_failure:
278 genlmsg_cancel(msg, hdr);
279 free_msg:
280 nlmsg_free(msg);
281 return -EMSGSIZE;
282 }
283
nfc_genl_tm_deactivated(struct nfc_dev * dev)284 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
285 {
286 struct sk_buff *msg;
287 void *hdr;
288
289 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
290 if (!msg)
291 return -ENOMEM;
292
293 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
294 NFC_EVENT_TM_DEACTIVATED);
295 if (!hdr)
296 goto free_msg;
297
298 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
299 goto nla_put_failure;
300
301 genlmsg_end(msg, hdr);
302
303 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
304
305 return 0;
306
307 nla_put_failure:
308 genlmsg_cancel(msg, hdr);
309 free_msg:
310 nlmsg_free(msg);
311 return -EMSGSIZE;
312 }
313
nfc_genl_device_added(struct nfc_dev * dev)314 int nfc_genl_device_added(struct nfc_dev *dev)
315 {
316 struct sk_buff *msg;
317 void *hdr;
318
319 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
320 if (!msg)
321 return -ENOMEM;
322
323 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
324 NFC_EVENT_DEVICE_ADDED);
325 if (!hdr)
326 goto free_msg;
327
328 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
329 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
330 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
331 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
332 goto nla_put_failure;
333
334 genlmsg_end(msg, hdr);
335
336 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
337
338 return 0;
339
340 nla_put_failure:
341 genlmsg_cancel(msg, hdr);
342 free_msg:
343 nlmsg_free(msg);
344 return -EMSGSIZE;
345 }
346
nfc_genl_device_removed(struct nfc_dev * dev)347 int nfc_genl_device_removed(struct nfc_dev *dev)
348 {
349 struct sk_buff *msg;
350 void *hdr;
351
352 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
353 if (!msg)
354 return -ENOMEM;
355
356 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
357 NFC_EVENT_DEVICE_REMOVED);
358 if (!hdr)
359 goto free_msg;
360
361 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
362 goto nla_put_failure;
363
364 genlmsg_end(msg, hdr);
365
366 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
367
368 return 0;
369
370 nla_put_failure:
371 genlmsg_cancel(msg, hdr);
372 free_msg:
373 nlmsg_free(msg);
374 return -EMSGSIZE;
375 }
376
nfc_genl_llc_send_sdres(struct nfc_dev * dev,struct hlist_head * sdres_list)377 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
378 {
379 struct sk_buff *msg;
380 struct nlattr *sdp_attr, *uri_attr;
381 struct nfc_llcp_sdp_tlv *sdres;
382 struct hlist_node *n;
383 void *hdr;
384 int rc = -EMSGSIZE;
385 int i;
386
387 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
388 if (!msg)
389 return -ENOMEM;
390
391 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
392 NFC_EVENT_LLC_SDRES);
393 if (!hdr)
394 goto free_msg;
395
396 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
397 goto nla_put_failure;
398
399 sdp_attr = nla_nest_start(msg, NFC_ATTR_LLC_SDP);
400 if (sdp_attr == NULL) {
401 rc = -ENOMEM;
402 goto nla_put_failure;
403 }
404
405 i = 1;
406 hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
407 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
408
409 uri_attr = nla_nest_start(msg, i++);
410 if (uri_attr == NULL) {
411 rc = -ENOMEM;
412 goto nla_put_failure;
413 }
414
415 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
416 goto nla_put_failure;
417
418 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
419 goto nla_put_failure;
420
421 nla_nest_end(msg, uri_attr);
422
423 hlist_del(&sdres->node);
424
425 nfc_llcp_free_sdp_tlv(sdres);
426 }
427
428 nla_nest_end(msg, sdp_attr);
429
430 genlmsg_end(msg, hdr);
431
432 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
433
434 nla_put_failure:
435 genlmsg_cancel(msg, hdr);
436
437 free_msg:
438 nlmsg_free(msg);
439
440 nfc_llcp_free_sdp_tlv_list(sdres_list);
441
442 return rc;
443 }
444
nfc_genl_se_added(struct nfc_dev * dev,u32 se_idx,u16 type)445 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
446 {
447 struct sk_buff *msg;
448 void *hdr;
449
450 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
451 if (!msg)
452 return -ENOMEM;
453
454 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
455 NFC_EVENT_SE_ADDED);
456 if (!hdr)
457 goto free_msg;
458
459 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
460 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
461 nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
462 goto nla_put_failure;
463
464 genlmsg_end(msg, hdr);
465
466 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
467
468 return 0;
469
470 nla_put_failure:
471 genlmsg_cancel(msg, hdr);
472 free_msg:
473 nlmsg_free(msg);
474 return -EMSGSIZE;
475 }
476
nfc_genl_se_removed(struct nfc_dev * dev,u32 se_idx)477 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
478 {
479 struct sk_buff *msg;
480 void *hdr;
481
482 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
483 if (!msg)
484 return -ENOMEM;
485
486 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
487 NFC_EVENT_SE_REMOVED);
488 if (!hdr)
489 goto free_msg;
490
491 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
492 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
493 goto nla_put_failure;
494
495 genlmsg_end(msg, hdr);
496
497 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
498
499 return 0;
500
501 nla_put_failure:
502 genlmsg_cancel(msg, hdr);
503 free_msg:
504 nlmsg_free(msg);
505 return -EMSGSIZE;
506 }
507
nfc_genl_se_transaction(struct nfc_dev * dev,u8 se_idx,struct nfc_evt_transaction * evt_transaction)508 int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
509 struct nfc_evt_transaction *evt_transaction)
510 {
511 struct nfc_se *se;
512 struct sk_buff *msg;
513 void *hdr;
514
515 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
516 if (!msg)
517 return -ENOMEM;
518
519 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
520 NFC_EVENT_SE_TRANSACTION);
521 if (!hdr)
522 goto free_msg;
523
524 se = nfc_find_se(dev, se_idx);
525 if (!se)
526 goto free_msg;
527
528 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
529 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
530 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||
531 nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,
532 evt_transaction->aid) ||
533 nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,
534 evt_transaction->params))
535 goto nla_put_failure;
536
537 /* evt_transaction is no more used */
538 devm_kfree(&dev->dev, evt_transaction);
539
540 genlmsg_end(msg, hdr);
541
542 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
543
544 return 0;
545
546 nla_put_failure:
547 genlmsg_cancel(msg, hdr);
548 free_msg:
549 /* evt_transaction is no more used */
550 devm_kfree(&dev->dev, evt_transaction);
551 nlmsg_free(msg);
552 return -EMSGSIZE;
553 }
554
nfc_genl_se_connectivity(struct nfc_dev * dev,u8 se_idx)555 int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
556 {
557 struct nfc_se *se;
558 struct sk_buff *msg;
559 void *hdr;
560
561 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
562 if (!msg)
563 return -ENOMEM;
564
565 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
566 NFC_EVENT_SE_CONNECTIVITY);
567 if (!hdr)
568 goto free_msg;
569
570 se = nfc_find_se(dev, se_idx);
571 if (!se)
572 goto free_msg;
573
574 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
575 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
576 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
577 goto nla_put_failure;
578
579 genlmsg_end(msg, hdr);
580
581 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
582
583 return 0;
584
585 nla_put_failure:
586 genlmsg_cancel(msg, hdr);
587 free_msg:
588 nlmsg_free(msg);
589 return -EMSGSIZE;
590 }
591
nfc_genl_send_device(struct sk_buff * msg,struct nfc_dev * dev,u32 portid,u32 seq,struct netlink_callback * cb,int flags)592 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
593 u32 portid, u32 seq,
594 struct netlink_callback *cb,
595 int flags)
596 {
597 void *hdr;
598
599 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
600 NFC_CMD_GET_DEVICE);
601 if (!hdr)
602 return -EMSGSIZE;
603
604 if (cb)
605 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
606
607 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
608 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
609 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
610 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
611 nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
612 goto nla_put_failure;
613
614 genlmsg_end(msg, hdr);
615 return 0;
616
617 nla_put_failure:
618 genlmsg_cancel(msg, hdr);
619 return -EMSGSIZE;
620 }
621
nfc_genl_dump_devices(struct sk_buff * skb,struct netlink_callback * cb)622 static int nfc_genl_dump_devices(struct sk_buff *skb,
623 struct netlink_callback *cb)
624 {
625 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
626 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
627 bool first_call = false;
628
629 if (!iter) {
630 first_call = true;
631 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
632 if (!iter)
633 return -ENOMEM;
634 cb->args[0] = (long) iter;
635 }
636
637 mutex_lock(&nfc_devlist_mutex);
638
639 cb->seq = nfc_devlist_generation;
640
641 if (first_call) {
642 nfc_device_iter_init(iter);
643 dev = nfc_device_iter_next(iter);
644 }
645
646 while (dev) {
647 int rc;
648
649 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
650 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
651 if (rc < 0)
652 break;
653
654 dev = nfc_device_iter_next(iter);
655 }
656
657 mutex_unlock(&nfc_devlist_mutex);
658
659 cb->args[1] = (long) dev;
660
661 return skb->len;
662 }
663
nfc_genl_dump_devices_done(struct netlink_callback * cb)664 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
665 {
666 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
667
668 nfc_device_iter_exit(iter);
669 kfree(iter);
670
671 return 0;
672 }
673
nfc_genl_dep_link_up_event(struct nfc_dev * dev,u32 target_idx,u8 comm_mode,u8 rf_mode)674 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
675 u8 comm_mode, u8 rf_mode)
676 {
677 struct sk_buff *msg;
678 void *hdr;
679
680 pr_debug("DEP link is up\n");
681
682 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
683 if (!msg)
684 return -ENOMEM;
685
686 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
687 if (!hdr)
688 goto free_msg;
689
690 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
691 goto nla_put_failure;
692 if (rf_mode == NFC_RF_INITIATOR &&
693 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
694 goto nla_put_failure;
695 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
696 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
697 goto nla_put_failure;
698
699 genlmsg_end(msg, hdr);
700
701 dev->dep_link_up = true;
702
703 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
704
705 return 0;
706
707 nla_put_failure:
708 genlmsg_cancel(msg, hdr);
709 free_msg:
710 nlmsg_free(msg);
711 return -EMSGSIZE;
712 }
713
nfc_genl_dep_link_down_event(struct nfc_dev * dev)714 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
715 {
716 struct sk_buff *msg;
717 void *hdr;
718
719 pr_debug("DEP link is down\n");
720
721 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
722 if (!msg)
723 return -ENOMEM;
724
725 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
726 NFC_CMD_DEP_LINK_DOWN);
727 if (!hdr)
728 goto free_msg;
729
730 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
731 goto nla_put_failure;
732
733 genlmsg_end(msg, hdr);
734
735 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
736
737 return 0;
738
739 nla_put_failure:
740 genlmsg_cancel(msg, hdr);
741 free_msg:
742 nlmsg_free(msg);
743 return -EMSGSIZE;
744 }
745
nfc_genl_get_device(struct sk_buff * skb,struct genl_info * info)746 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
747 {
748 struct sk_buff *msg;
749 struct nfc_dev *dev;
750 u32 idx;
751 int rc = -ENOBUFS;
752
753 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
754 return -EINVAL;
755
756 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
757
758 dev = nfc_get_device(idx);
759 if (!dev)
760 return -ENODEV;
761
762 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
763 if (!msg) {
764 rc = -ENOMEM;
765 goto out_putdev;
766 }
767
768 rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
769 NULL, 0);
770 if (rc < 0)
771 goto out_free;
772
773 nfc_put_device(dev);
774
775 return genlmsg_reply(msg, info);
776
777 out_free:
778 nlmsg_free(msg);
779 out_putdev:
780 nfc_put_device(dev);
781 return rc;
782 }
783
nfc_genl_dev_up(struct sk_buff * skb,struct genl_info * info)784 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
785 {
786 struct nfc_dev *dev;
787 int rc;
788 u32 idx;
789
790 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
791 return -EINVAL;
792
793 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
794
795 dev = nfc_get_device(idx);
796 if (!dev)
797 return -ENODEV;
798
799 rc = nfc_dev_up(dev);
800
801 nfc_put_device(dev);
802 return rc;
803 }
804
nfc_genl_dev_down(struct sk_buff * skb,struct genl_info * info)805 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
806 {
807 struct nfc_dev *dev;
808 int rc;
809 u32 idx;
810
811 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
812 return -EINVAL;
813
814 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
815
816 dev = nfc_get_device(idx);
817 if (!dev)
818 return -ENODEV;
819
820 rc = nfc_dev_down(dev);
821
822 nfc_put_device(dev);
823 return rc;
824 }
825
nfc_genl_start_poll(struct sk_buff * skb,struct genl_info * info)826 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
827 {
828 struct nfc_dev *dev;
829 int rc;
830 u32 idx;
831 u32 im_protocols = 0, tm_protocols = 0;
832
833 pr_debug("Poll start\n");
834
835 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
836 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
837 !info->attrs[NFC_ATTR_PROTOCOLS]) &&
838 !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
839 return -EINVAL;
840
841 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
842
843 if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
844 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
845
846 if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
847 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
848 else if (info->attrs[NFC_ATTR_PROTOCOLS])
849 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
850
851 dev = nfc_get_device(idx);
852 if (!dev)
853 return -ENODEV;
854
855 mutex_lock(&dev->genl_data.genl_data_mutex);
856
857 rc = nfc_start_poll(dev, im_protocols, tm_protocols);
858 if (!rc)
859 dev->genl_data.poll_req_portid = info->snd_portid;
860
861 mutex_unlock(&dev->genl_data.genl_data_mutex);
862
863 nfc_put_device(dev);
864 return rc;
865 }
866
nfc_genl_stop_poll(struct sk_buff * skb,struct genl_info * info)867 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
868 {
869 struct nfc_dev *dev;
870 int rc;
871 u32 idx;
872
873 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
874 return -EINVAL;
875
876 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
877
878 dev = nfc_get_device(idx);
879 if (!dev)
880 return -ENODEV;
881
882 device_lock(&dev->dev);
883
884 if (!dev->polling) {
885 device_unlock(&dev->dev);
886 return -EINVAL;
887 }
888
889 device_unlock(&dev->dev);
890
891 mutex_lock(&dev->genl_data.genl_data_mutex);
892
893 if (dev->genl_data.poll_req_portid != info->snd_portid) {
894 rc = -EBUSY;
895 goto out;
896 }
897
898 rc = nfc_stop_poll(dev);
899 dev->genl_data.poll_req_portid = 0;
900
901 out:
902 mutex_unlock(&dev->genl_data.genl_data_mutex);
903 nfc_put_device(dev);
904 return rc;
905 }
906
nfc_genl_activate_target(struct sk_buff * skb,struct genl_info * info)907 static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
908 {
909 struct nfc_dev *dev;
910 u32 device_idx, target_idx, protocol;
911 int rc;
912
913 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
914 !info->attrs[NFC_ATTR_TARGET_INDEX] ||
915 !info->attrs[NFC_ATTR_PROTOCOLS])
916 return -EINVAL;
917
918 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
919
920 dev = nfc_get_device(device_idx);
921 if (!dev)
922 return -ENODEV;
923
924 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
925 protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
926
927 nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
928 rc = nfc_activate_target(dev, target_idx, protocol);
929
930 nfc_put_device(dev);
931 return 0;
932 }
933
nfc_genl_dep_link_up(struct sk_buff * skb,struct genl_info * info)934 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
935 {
936 struct nfc_dev *dev;
937 int rc, tgt_idx;
938 u32 idx;
939 u8 comm;
940
941 pr_debug("DEP link up\n");
942
943 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
944 !info->attrs[NFC_ATTR_COMM_MODE])
945 return -EINVAL;
946
947 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
948 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
949 tgt_idx = NFC_TARGET_IDX_ANY;
950 else
951 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
952
953 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
954
955 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
956 return -EINVAL;
957
958 dev = nfc_get_device(idx);
959 if (!dev)
960 return -ENODEV;
961
962 rc = nfc_dep_link_up(dev, tgt_idx, comm);
963
964 nfc_put_device(dev);
965
966 return rc;
967 }
968
nfc_genl_dep_link_down(struct sk_buff * skb,struct genl_info * info)969 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
970 {
971 struct nfc_dev *dev;
972 int rc;
973 u32 idx;
974
975 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
976 return -EINVAL;
977
978 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
979
980 dev = nfc_get_device(idx);
981 if (!dev)
982 return -ENODEV;
983
984 rc = nfc_dep_link_down(dev);
985
986 nfc_put_device(dev);
987 return rc;
988 }
989
nfc_genl_send_params(struct sk_buff * msg,struct nfc_llcp_local * local,u32 portid,u32 seq)990 static int nfc_genl_send_params(struct sk_buff *msg,
991 struct nfc_llcp_local *local,
992 u32 portid, u32 seq)
993 {
994 void *hdr;
995
996 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
997 NFC_CMD_LLC_GET_PARAMS);
998 if (!hdr)
999 return -EMSGSIZE;
1000
1001 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
1002 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
1003 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1004 nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1005 goto nla_put_failure;
1006
1007 genlmsg_end(msg, hdr);
1008 return 0;
1009
1010 nla_put_failure:
1011
1012 genlmsg_cancel(msg, hdr);
1013 return -EMSGSIZE;
1014 }
1015
nfc_genl_llc_get_params(struct sk_buff * skb,struct genl_info * info)1016 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1017 {
1018 struct nfc_dev *dev;
1019 struct nfc_llcp_local *local;
1020 int rc = 0;
1021 struct sk_buff *msg = NULL;
1022 u32 idx;
1023
1024 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1025 return -EINVAL;
1026
1027 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1028
1029 dev = nfc_get_device(idx);
1030 if (!dev)
1031 return -ENODEV;
1032
1033 device_lock(&dev->dev);
1034
1035 local = nfc_llcp_find_local(dev);
1036 if (!local) {
1037 rc = -ENODEV;
1038 goto exit;
1039 }
1040
1041 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1042 if (!msg) {
1043 rc = -ENOMEM;
1044 goto exit;
1045 }
1046
1047 rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1048
1049 exit:
1050 device_unlock(&dev->dev);
1051
1052 nfc_put_device(dev);
1053
1054 if (rc < 0) {
1055 if (msg)
1056 nlmsg_free(msg);
1057
1058 return rc;
1059 }
1060
1061 return genlmsg_reply(msg, info);
1062 }
1063
nfc_genl_llc_set_params(struct sk_buff * skb,struct genl_info * info)1064 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1065 {
1066 struct nfc_dev *dev;
1067 struct nfc_llcp_local *local;
1068 u8 rw = 0;
1069 u16 miux = 0;
1070 u32 idx;
1071 int rc = 0;
1072
1073 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1074 (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1075 !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1076 !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1077 return -EINVAL;
1078
1079 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1080 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1081
1082 if (rw > LLCP_MAX_RW)
1083 return -EINVAL;
1084 }
1085
1086 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1087 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1088
1089 if (miux > LLCP_MAX_MIUX)
1090 return -EINVAL;
1091 }
1092
1093 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1094
1095 dev = nfc_get_device(idx);
1096 if (!dev)
1097 return -ENODEV;
1098
1099 device_lock(&dev->dev);
1100
1101 local = nfc_llcp_find_local(dev);
1102 if (!local) {
1103 nfc_put_device(dev);
1104 rc = -ENODEV;
1105 goto exit;
1106 }
1107
1108 if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1109 if (dev->dep_link_up) {
1110 rc = -EINPROGRESS;
1111 goto exit;
1112 }
1113
1114 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1115 }
1116
1117 if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1118 local->rw = rw;
1119
1120 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1121 local->miux = cpu_to_be16(miux);
1122
1123 exit:
1124 device_unlock(&dev->dev);
1125
1126 nfc_put_device(dev);
1127
1128 return rc;
1129 }
1130
nfc_genl_llc_sdreq(struct sk_buff * skb,struct genl_info * info)1131 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1132 {
1133 struct nfc_dev *dev;
1134 struct nfc_llcp_local *local;
1135 struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1136 u32 idx;
1137 u8 tid;
1138 char *uri;
1139 int rc = 0, rem;
1140 size_t uri_len, tlvs_len;
1141 struct hlist_head sdreq_list;
1142 struct nfc_llcp_sdp_tlv *sdreq;
1143
1144 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1145 !info->attrs[NFC_ATTR_LLC_SDP])
1146 return -EINVAL;
1147
1148 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1149
1150 dev = nfc_get_device(idx);
1151 if (!dev)
1152 return -ENODEV;
1153
1154 device_lock(&dev->dev);
1155
1156 if (dev->dep_link_up == false) {
1157 rc = -ENOLINK;
1158 goto exit;
1159 }
1160
1161 local = nfc_llcp_find_local(dev);
1162 if (!local) {
1163 nfc_put_device(dev);
1164 rc = -ENODEV;
1165 goto exit;
1166 }
1167
1168 INIT_HLIST_HEAD(&sdreq_list);
1169
1170 tlvs_len = 0;
1171
1172 nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1173 rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
1174 nfc_sdp_genl_policy);
1175
1176 if (rc != 0) {
1177 rc = -EINVAL;
1178 goto exit;
1179 }
1180
1181 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1182 continue;
1183
1184 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1185 if (uri_len == 0)
1186 continue;
1187
1188 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1189 if (uri == NULL || *uri == 0)
1190 continue;
1191
1192 tid = local->sdreq_next_tid++;
1193
1194 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1195 if (sdreq == NULL) {
1196 rc = -ENOMEM;
1197 goto exit;
1198 }
1199
1200 tlvs_len += sdreq->tlv_len;
1201
1202 hlist_add_head(&sdreq->node, &sdreq_list);
1203 }
1204
1205 if (hlist_empty(&sdreq_list)) {
1206 rc = -EINVAL;
1207 goto exit;
1208 }
1209
1210 rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1211 exit:
1212 device_unlock(&dev->dev);
1213
1214 nfc_put_device(dev);
1215
1216 return rc;
1217 }
1218
nfc_genl_fw_download(struct sk_buff * skb,struct genl_info * info)1219 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1220 {
1221 struct nfc_dev *dev;
1222 int rc;
1223 u32 idx;
1224 char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1225
1226 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1227 return -EINVAL;
1228
1229 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1230
1231 dev = nfc_get_device(idx);
1232 if (!dev)
1233 return -ENODEV;
1234
1235 nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1236 sizeof(firmware_name));
1237
1238 rc = nfc_fw_download(dev, firmware_name);
1239
1240 nfc_put_device(dev);
1241 return rc;
1242 }
1243
nfc_genl_fw_download_done(struct nfc_dev * dev,const char * firmware_name,u32 result)1244 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1245 u32 result)
1246 {
1247 struct sk_buff *msg;
1248 void *hdr;
1249
1250 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1251 if (!msg)
1252 return -ENOMEM;
1253
1254 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1255 NFC_CMD_FW_DOWNLOAD);
1256 if (!hdr)
1257 goto free_msg;
1258
1259 if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1260 nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1261 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1262 goto nla_put_failure;
1263
1264 genlmsg_end(msg, hdr);
1265
1266 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1267
1268 return 0;
1269
1270 nla_put_failure:
1271 genlmsg_cancel(msg, hdr);
1272 free_msg:
1273 nlmsg_free(msg);
1274 return -EMSGSIZE;
1275 }
1276
nfc_genl_enable_se(struct sk_buff * skb,struct genl_info * info)1277 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1278 {
1279 struct nfc_dev *dev;
1280 int rc;
1281 u32 idx, se_idx;
1282
1283 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1284 !info->attrs[NFC_ATTR_SE_INDEX])
1285 return -EINVAL;
1286
1287 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1288 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1289
1290 dev = nfc_get_device(idx);
1291 if (!dev)
1292 return -ENODEV;
1293
1294 rc = nfc_enable_se(dev, se_idx);
1295
1296 nfc_put_device(dev);
1297 return rc;
1298 }
1299
nfc_genl_disable_se(struct sk_buff * skb,struct genl_info * info)1300 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1301 {
1302 struct nfc_dev *dev;
1303 int rc;
1304 u32 idx, se_idx;
1305
1306 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1307 !info->attrs[NFC_ATTR_SE_INDEX])
1308 return -EINVAL;
1309
1310 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1311 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1312
1313 dev = nfc_get_device(idx);
1314 if (!dev)
1315 return -ENODEV;
1316
1317 rc = nfc_disable_se(dev, se_idx);
1318
1319 nfc_put_device(dev);
1320 return rc;
1321 }
1322
nfc_genl_send_se(struct sk_buff * msg,struct nfc_dev * dev,u32 portid,u32 seq,struct netlink_callback * cb,int flags)1323 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1324 u32 portid, u32 seq,
1325 struct netlink_callback *cb,
1326 int flags)
1327 {
1328 void *hdr;
1329 struct nfc_se *se, *n;
1330
1331 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1332 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1333 NFC_CMD_GET_SE);
1334 if (!hdr)
1335 goto nla_put_failure;
1336
1337 if (cb)
1338 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
1339
1340 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1341 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1342 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1343 goto nla_put_failure;
1344
1345 genlmsg_end(msg, hdr);
1346 }
1347
1348 return 0;
1349
1350 nla_put_failure:
1351 genlmsg_cancel(msg, hdr);
1352 return -EMSGSIZE;
1353 }
1354
nfc_genl_dump_ses(struct sk_buff * skb,struct netlink_callback * cb)1355 static int nfc_genl_dump_ses(struct sk_buff *skb,
1356 struct netlink_callback *cb)
1357 {
1358 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1359 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1360 bool first_call = false;
1361
1362 if (!iter) {
1363 first_call = true;
1364 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1365 if (!iter)
1366 return -ENOMEM;
1367 cb->args[0] = (long) iter;
1368 }
1369
1370 mutex_lock(&nfc_devlist_mutex);
1371
1372 cb->seq = nfc_devlist_generation;
1373
1374 if (first_call) {
1375 nfc_device_iter_init(iter);
1376 dev = nfc_device_iter_next(iter);
1377 }
1378
1379 while (dev) {
1380 int rc;
1381
1382 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1383 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1384 if (rc < 0)
1385 break;
1386
1387 dev = nfc_device_iter_next(iter);
1388 }
1389
1390 mutex_unlock(&nfc_devlist_mutex);
1391
1392 cb->args[1] = (long) dev;
1393
1394 return skb->len;
1395 }
1396
nfc_genl_dump_ses_done(struct netlink_callback * cb)1397 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1398 {
1399 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1400
1401 nfc_device_iter_exit(iter);
1402 kfree(iter);
1403
1404 return 0;
1405 }
1406
nfc_se_io(struct nfc_dev * dev,u32 se_idx,u8 * apdu,size_t apdu_length,se_io_cb_t cb,void * cb_context)1407 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1408 u8 *apdu, size_t apdu_length,
1409 se_io_cb_t cb, void *cb_context)
1410 {
1411 struct nfc_se *se;
1412 int rc;
1413
1414 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1415
1416 device_lock(&dev->dev);
1417
1418 if (!device_is_registered(&dev->dev)) {
1419 rc = -ENODEV;
1420 goto error;
1421 }
1422
1423 if (!dev->dev_up) {
1424 rc = -ENODEV;
1425 goto error;
1426 }
1427
1428 if (!dev->ops->se_io) {
1429 rc = -EOPNOTSUPP;
1430 goto error;
1431 }
1432
1433 se = nfc_find_se(dev, se_idx);
1434 if (!se) {
1435 rc = -EINVAL;
1436 goto error;
1437 }
1438
1439 if (se->state != NFC_SE_ENABLED) {
1440 rc = -ENODEV;
1441 goto error;
1442 }
1443
1444 rc = dev->ops->se_io(dev, se_idx, apdu,
1445 apdu_length, cb, cb_context);
1446
1447 error:
1448 device_unlock(&dev->dev);
1449 return rc;
1450 }
1451
1452 struct se_io_ctx {
1453 u32 dev_idx;
1454 u32 se_idx;
1455 };
1456
se_io_cb(void * context,u8 * apdu,size_t apdu_len,int err)1457 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1458 {
1459 struct se_io_ctx *ctx = context;
1460 struct sk_buff *msg;
1461 void *hdr;
1462
1463 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1464 if (!msg) {
1465 kfree(ctx);
1466 return;
1467 }
1468
1469 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1470 NFC_CMD_SE_IO);
1471 if (!hdr)
1472 goto free_msg;
1473
1474 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1475 nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1476 nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1477 goto nla_put_failure;
1478
1479 genlmsg_end(msg, hdr);
1480
1481 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1482
1483 kfree(ctx);
1484
1485 return;
1486
1487 nla_put_failure:
1488 genlmsg_cancel(msg, hdr);
1489 free_msg:
1490 nlmsg_free(msg);
1491 kfree(ctx);
1492
1493 return;
1494 }
1495
nfc_genl_se_io(struct sk_buff * skb,struct genl_info * info)1496 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1497 {
1498 struct nfc_dev *dev;
1499 struct se_io_ctx *ctx;
1500 u32 dev_idx, se_idx;
1501 u8 *apdu;
1502 size_t apdu_len;
1503
1504 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1505 !info->attrs[NFC_ATTR_SE_INDEX] ||
1506 !info->attrs[NFC_ATTR_SE_APDU])
1507 return -EINVAL;
1508
1509 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1510 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1511
1512 dev = nfc_get_device(dev_idx);
1513 if (!dev)
1514 return -ENODEV;
1515
1516 if (!dev->ops || !dev->ops->se_io)
1517 return -ENOTSUPP;
1518
1519 apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1520 if (apdu_len == 0)
1521 return -EINVAL;
1522
1523 apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1524 if (!apdu)
1525 return -EINVAL;
1526
1527 ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1528 if (!ctx)
1529 return -ENOMEM;
1530
1531 ctx->dev_idx = dev_idx;
1532 ctx->se_idx = se_idx;
1533
1534 return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1535 }
1536
nfc_genl_vendor_cmd(struct sk_buff * skb,struct genl_info * info)1537 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1538 struct genl_info *info)
1539 {
1540 struct nfc_dev *dev;
1541 struct nfc_vendor_cmd *cmd;
1542 u32 dev_idx, vid, subcmd;
1543 u8 *data;
1544 size_t data_len;
1545 int i, err;
1546
1547 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1548 !info->attrs[NFC_ATTR_VENDOR_ID] ||
1549 !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1550 return -EINVAL;
1551
1552 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1553 vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1554 subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1555
1556 dev = nfc_get_device(dev_idx);
1557 if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
1558 return -ENODEV;
1559
1560 if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1561 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1562 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1563 if (data_len == 0)
1564 return -EINVAL;
1565 } else {
1566 data = NULL;
1567 data_len = 0;
1568 }
1569
1570 for (i = 0; i < dev->n_vendor_cmds; i++) {
1571 cmd = &dev->vendor_cmds[i];
1572
1573 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1574 continue;
1575
1576 dev->cur_cmd_info = info;
1577 err = cmd->doit(dev, data, data_len);
1578 dev->cur_cmd_info = NULL;
1579 return err;
1580 }
1581
1582 return -EOPNOTSUPP;
1583 }
1584
1585 /* message building helper */
nfc_hdr_put(struct sk_buff * skb,u32 portid,u32 seq,int flags,u8 cmd)1586 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1587 int flags, u8 cmd)
1588 {
1589 /* since there is no private header just add the generic one */
1590 return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1591 }
1592
1593 static struct sk_buff *
__nfc_alloc_vendor_cmd_skb(struct nfc_dev * dev,int approxlen,u32 portid,u32 seq,enum nfc_attrs attr,u32 oui,u32 subcmd,gfp_t gfp)1594 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1595 u32 portid, u32 seq,
1596 enum nfc_attrs attr,
1597 u32 oui, u32 subcmd, gfp_t gfp)
1598 {
1599 struct sk_buff *skb;
1600 void *hdr;
1601
1602 skb = nlmsg_new(approxlen + 100, gfp);
1603 if (!skb)
1604 return NULL;
1605
1606 hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1607 if (!hdr) {
1608 kfree_skb(skb);
1609 return NULL;
1610 }
1611
1612 if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1613 goto nla_put_failure;
1614 if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1615 goto nla_put_failure;
1616 if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1617 goto nla_put_failure;
1618
1619 ((void **)skb->cb)[0] = dev;
1620 ((void **)skb->cb)[1] = hdr;
1621
1622 return skb;
1623
1624 nla_put_failure:
1625 kfree_skb(skb);
1626 return NULL;
1627 }
1628
__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev * dev,enum nfc_attrs attr,u32 oui,u32 subcmd,int approxlen)1629 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1630 enum nfc_attrs attr,
1631 u32 oui, u32 subcmd,
1632 int approxlen)
1633 {
1634 if (WARN_ON(!dev->cur_cmd_info))
1635 return NULL;
1636
1637 return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1638 dev->cur_cmd_info->snd_portid,
1639 dev->cur_cmd_info->snd_seq, attr,
1640 oui, subcmd, GFP_KERNEL);
1641 }
1642 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1643
nfc_vendor_cmd_reply(struct sk_buff * skb)1644 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1645 {
1646 struct nfc_dev *dev = ((void **)skb->cb)[0];
1647 void *hdr = ((void **)skb->cb)[1];
1648
1649 /* clear CB data for netlink core to own from now on */
1650 memset(skb->cb, 0, sizeof(skb->cb));
1651
1652 if (WARN_ON(!dev->cur_cmd_info)) {
1653 kfree_skb(skb);
1654 return -EINVAL;
1655 }
1656
1657 genlmsg_end(skb, hdr);
1658 return genlmsg_reply(skb, dev->cur_cmd_info);
1659 }
1660 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1661
1662 static const struct genl_ops nfc_genl_ops[] = {
1663 {
1664 .cmd = NFC_CMD_GET_DEVICE,
1665 .doit = nfc_genl_get_device,
1666 .dumpit = nfc_genl_dump_devices,
1667 .done = nfc_genl_dump_devices_done,
1668 .policy = nfc_genl_policy,
1669 },
1670 {
1671 .cmd = NFC_CMD_DEV_UP,
1672 .doit = nfc_genl_dev_up,
1673 .policy = nfc_genl_policy,
1674 },
1675 {
1676 .cmd = NFC_CMD_DEV_DOWN,
1677 .doit = nfc_genl_dev_down,
1678 .policy = nfc_genl_policy,
1679 },
1680 {
1681 .cmd = NFC_CMD_START_POLL,
1682 .doit = nfc_genl_start_poll,
1683 .policy = nfc_genl_policy,
1684 },
1685 {
1686 .cmd = NFC_CMD_STOP_POLL,
1687 .doit = nfc_genl_stop_poll,
1688 .policy = nfc_genl_policy,
1689 },
1690 {
1691 .cmd = NFC_CMD_DEP_LINK_UP,
1692 .doit = nfc_genl_dep_link_up,
1693 .policy = nfc_genl_policy,
1694 },
1695 {
1696 .cmd = NFC_CMD_DEP_LINK_DOWN,
1697 .doit = nfc_genl_dep_link_down,
1698 .policy = nfc_genl_policy,
1699 },
1700 {
1701 .cmd = NFC_CMD_GET_TARGET,
1702 .dumpit = nfc_genl_dump_targets,
1703 .done = nfc_genl_dump_targets_done,
1704 .policy = nfc_genl_policy,
1705 },
1706 {
1707 .cmd = NFC_CMD_LLC_GET_PARAMS,
1708 .doit = nfc_genl_llc_get_params,
1709 .policy = nfc_genl_policy,
1710 },
1711 {
1712 .cmd = NFC_CMD_LLC_SET_PARAMS,
1713 .doit = nfc_genl_llc_set_params,
1714 .policy = nfc_genl_policy,
1715 },
1716 {
1717 .cmd = NFC_CMD_LLC_SDREQ,
1718 .doit = nfc_genl_llc_sdreq,
1719 .policy = nfc_genl_policy,
1720 },
1721 {
1722 .cmd = NFC_CMD_FW_DOWNLOAD,
1723 .doit = nfc_genl_fw_download,
1724 .policy = nfc_genl_policy,
1725 },
1726 {
1727 .cmd = NFC_CMD_ENABLE_SE,
1728 .doit = nfc_genl_enable_se,
1729 .policy = nfc_genl_policy,
1730 },
1731 {
1732 .cmd = NFC_CMD_DISABLE_SE,
1733 .doit = nfc_genl_disable_se,
1734 .policy = nfc_genl_policy,
1735 },
1736 {
1737 .cmd = NFC_CMD_GET_SE,
1738 .dumpit = nfc_genl_dump_ses,
1739 .done = nfc_genl_dump_ses_done,
1740 .policy = nfc_genl_policy,
1741 },
1742 {
1743 .cmd = NFC_CMD_SE_IO,
1744 .doit = nfc_genl_se_io,
1745 .policy = nfc_genl_policy,
1746 },
1747 {
1748 .cmd = NFC_CMD_ACTIVATE_TARGET,
1749 .doit = nfc_genl_activate_target,
1750 .policy = nfc_genl_policy,
1751 },
1752 {
1753 .cmd = NFC_CMD_VENDOR,
1754 .doit = nfc_genl_vendor_cmd,
1755 .policy = nfc_genl_policy,
1756 },
1757 };
1758
1759
1760 struct urelease_work {
1761 struct work_struct w;
1762 u32 portid;
1763 };
1764
nfc_urelease_event_work(struct work_struct * work)1765 static void nfc_urelease_event_work(struct work_struct *work)
1766 {
1767 struct urelease_work *w = container_of(work, struct urelease_work, w);
1768 struct class_dev_iter iter;
1769 struct nfc_dev *dev;
1770
1771 pr_debug("portid %d\n", w->portid);
1772
1773 mutex_lock(&nfc_devlist_mutex);
1774
1775 nfc_device_iter_init(&iter);
1776 dev = nfc_device_iter_next(&iter);
1777
1778 while (dev) {
1779 mutex_lock(&dev->genl_data.genl_data_mutex);
1780
1781 if (dev->genl_data.poll_req_portid == w->portid) {
1782 nfc_stop_poll(dev);
1783 dev->genl_data.poll_req_portid = 0;
1784 }
1785
1786 mutex_unlock(&dev->genl_data.genl_data_mutex);
1787
1788 dev = nfc_device_iter_next(&iter);
1789 }
1790
1791 nfc_device_iter_exit(&iter);
1792
1793 mutex_unlock(&nfc_devlist_mutex);
1794
1795 kfree(w);
1796 }
1797
nfc_genl_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)1798 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1799 unsigned long event, void *ptr)
1800 {
1801 struct netlink_notify *n = ptr;
1802 struct urelease_work *w;
1803
1804 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1805 goto out;
1806
1807 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1808
1809 w = kmalloc(sizeof(*w), GFP_ATOMIC);
1810 if (w) {
1811 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
1812 w->portid = n->portid;
1813 schedule_work((struct work_struct *) w);
1814 }
1815
1816 out:
1817 return NOTIFY_DONE;
1818 }
1819
nfc_genl_data_init(struct nfc_genl_data * genl_data)1820 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1821 {
1822 genl_data->poll_req_portid = 0;
1823 mutex_init(&genl_data->genl_data_mutex);
1824 }
1825
nfc_genl_data_exit(struct nfc_genl_data * genl_data)1826 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1827 {
1828 mutex_destroy(&genl_data->genl_data_mutex);
1829 }
1830
1831 static struct notifier_block nl_notifier = {
1832 .notifier_call = nfc_genl_rcv_nl_event,
1833 };
1834
1835 /**
1836 * nfc_genl_init() - Initialize netlink interface
1837 *
1838 * This initialization function registers the nfc netlink family.
1839 */
nfc_genl_init(void)1840 int __init nfc_genl_init(void)
1841 {
1842 int rc;
1843
1844 rc = genl_register_family_with_ops_groups(&nfc_genl_family,
1845 nfc_genl_ops,
1846 nfc_genl_mcgrps);
1847 if (rc)
1848 return rc;
1849
1850 netlink_register_notifier(&nl_notifier);
1851
1852 return 0;
1853 }
1854
1855 /**
1856 * nfc_genl_exit() - Deinitialize netlink interface
1857 *
1858 * This exit function unregisters the nfc netlink family.
1859 */
nfc_genl_exit(void)1860 void nfc_genl_exit(void)
1861 {
1862 netlink_unregister_notifier(&nl_notifier);
1863 genl_unregister_family(&nfc_genl_family);
1864 }
1865