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 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 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
48 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
49 [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
50 [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
51 [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
52 [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
53 [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
54 [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
55 [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
56 [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
57 .len = NFC_FIRMWARE_NAME_MAXSIZE },
58 [NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
59 [NFC_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
60
61 };
62
63 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
64 [NFC_SDP_ATTR_URI] = { .type = NLA_STRING,
65 .len = U8_MAX - 4 },
66 [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
67 };
68
nfc_genl_send_target(struct sk_buff * msg,struct nfc_target * target,struct netlink_callback * cb,int flags)69 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
70 struct netlink_callback *cb, int flags)
71 {
72 void *hdr;
73
74 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
75 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
76 if (!hdr)
77 return -EMSGSIZE;
78
79 genl_dump_check_consistent(cb, hdr);
80
81 if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
82 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
83 nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
84 nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
85 goto nla_put_failure;
86 if (target->nfcid1_len > 0 &&
87 nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
88 target->nfcid1))
89 goto nla_put_failure;
90 if (target->sensb_res_len > 0 &&
91 nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
92 target->sensb_res))
93 goto nla_put_failure;
94 if (target->sensf_res_len > 0 &&
95 nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
96 target->sensf_res))
97 goto nla_put_failure;
98
99 if (target->is_iso15693) {
100 if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID,
101 target->iso15693_dsfid) ||
102 nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID,
103 sizeof(target->iso15693_uid), target->iso15693_uid))
104 goto nla_put_failure;
105 }
106
107 genlmsg_end(msg, hdr);
108 return 0;
109
110 nla_put_failure:
111 genlmsg_cancel(msg, hdr);
112 return -EMSGSIZE;
113 }
114
__get_device_from_cb(struct netlink_callback * cb)115 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
116 {
117 struct nlattr **attrbuf = genl_family_attrbuf(&nfc_genl_family);
118 struct nfc_dev *dev;
119 int rc;
120 u32 idx;
121
122 rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
123 attrbuf, nfc_genl_family.maxattr, nfc_genl_policy,
124 NULL);
125 if (rc < 0)
126 return ERR_PTR(rc);
127
128 if (!attrbuf[NFC_ATTR_DEVICE_INDEX])
129 return ERR_PTR(-EINVAL);
130
131 idx = nla_get_u32(attrbuf[NFC_ATTR_DEVICE_INDEX]);
132
133 dev = nfc_get_device(idx);
134 if (!dev)
135 return ERR_PTR(-ENODEV);
136
137 return dev;
138 }
139
nfc_genl_dump_targets(struct sk_buff * skb,struct netlink_callback * cb)140 static int nfc_genl_dump_targets(struct sk_buff *skb,
141 struct netlink_callback *cb)
142 {
143 int i = cb->args[0];
144 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
145 int rc;
146
147 if (!dev) {
148 dev = __get_device_from_cb(cb);
149 if (IS_ERR(dev))
150 return PTR_ERR(dev);
151
152 cb->args[1] = (long) dev;
153 }
154
155 device_lock(&dev->dev);
156
157 cb->seq = dev->targets_generation;
158
159 while (i < dev->n_targets) {
160 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
161 NLM_F_MULTI);
162 if (rc < 0)
163 break;
164
165 i++;
166 }
167
168 device_unlock(&dev->dev);
169
170 cb->args[0] = i;
171
172 return skb->len;
173 }
174
nfc_genl_dump_targets_done(struct netlink_callback * cb)175 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
176 {
177 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
178
179 if (dev)
180 nfc_put_device(dev);
181
182 return 0;
183 }
184
nfc_genl_targets_found(struct nfc_dev * dev)185 int nfc_genl_targets_found(struct nfc_dev *dev)
186 {
187 struct sk_buff *msg;
188 void *hdr;
189
190 dev->genl_data.poll_req_portid = 0;
191
192 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
193 if (!msg)
194 return -ENOMEM;
195
196 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
197 NFC_EVENT_TARGETS_FOUND);
198 if (!hdr)
199 goto free_msg;
200
201 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
202 goto nla_put_failure;
203
204 genlmsg_end(msg, hdr);
205
206 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
207
208 nla_put_failure:
209 free_msg:
210 nlmsg_free(msg);
211 return -EMSGSIZE;
212 }
213
nfc_genl_target_lost(struct nfc_dev * dev,u32 target_idx)214 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
215 {
216 struct sk_buff *msg;
217 void *hdr;
218
219 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
220 if (!msg)
221 return -ENOMEM;
222
223 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
224 NFC_EVENT_TARGET_LOST);
225 if (!hdr)
226 goto free_msg;
227
228 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
229 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
230 goto nla_put_failure;
231
232 genlmsg_end(msg, hdr);
233
234 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
235
236 return 0;
237
238 nla_put_failure:
239 free_msg:
240 nlmsg_free(msg);
241 return -EMSGSIZE;
242 }
243
nfc_genl_tm_activated(struct nfc_dev * dev,u32 protocol)244 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
245 {
246 struct sk_buff *msg;
247 void *hdr;
248
249 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
250 if (!msg)
251 return -ENOMEM;
252
253 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
254 NFC_EVENT_TM_ACTIVATED);
255 if (!hdr)
256 goto free_msg;
257
258 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
259 goto nla_put_failure;
260 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
261 goto nla_put_failure;
262
263 genlmsg_end(msg, hdr);
264
265 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
266
267 return 0;
268
269 nla_put_failure:
270 free_msg:
271 nlmsg_free(msg);
272 return -EMSGSIZE;
273 }
274
nfc_genl_tm_deactivated(struct nfc_dev * dev)275 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
276 {
277 struct sk_buff *msg;
278 void *hdr;
279
280 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
281 if (!msg)
282 return -ENOMEM;
283
284 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
285 NFC_EVENT_TM_DEACTIVATED);
286 if (!hdr)
287 goto free_msg;
288
289 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
290 goto nla_put_failure;
291
292 genlmsg_end(msg, hdr);
293
294 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
295
296 return 0;
297
298 nla_put_failure:
299 free_msg:
300 nlmsg_free(msg);
301 return -EMSGSIZE;
302 }
303
nfc_genl_setup_device_added(struct nfc_dev * dev,struct sk_buff * msg)304 static int nfc_genl_setup_device_added(struct nfc_dev *dev, struct sk_buff *msg)
305 {
306 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
307 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
308 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
309 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
310 nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
311 return -1;
312 return 0;
313 }
314
nfc_genl_device_added(struct nfc_dev * dev)315 int nfc_genl_device_added(struct nfc_dev *dev)
316 {
317 struct sk_buff *msg;
318 void *hdr;
319
320 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
321 if (!msg)
322 return -ENOMEM;
323
324 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
325 NFC_EVENT_DEVICE_ADDED);
326 if (!hdr)
327 goto free_msg;
328
329 if (nfc_genl_setup_device_added(dev, msg))
330 goto nla_put_failure;
331
332 genlmsg_end(msg, hdr);
333
334 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
335
336 return 0;
337
338 nla_put_failure:
339 free_msg:
340 nlmsg_free(msg);
341 return -EMSGSIZE;
342 }
343
nfc_genl_device_removed(struct nfc_dev * dev)344 int nfc_genl_device_removed(struct nfc_dev *dev)
345 {
346 struct sk_buff *msg;
347 void *hdr;
348
349 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
350 if (!msg)
351 return -ENOMEM;
352
353 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
354 NFC_EVENT_DEVICE_REMOVED);
355 if (!hdr)
356 goto free_msg;
357
358 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
359 goto nla_put_failure;
360
361 genlmsg_end(msg, hdr);
362
363 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
364
365 return 0;
366
367 nla_put_failure:
368 free_msg:
369 nlmsg_free(msg);
370 return -EMSGSIZE;
371 }
372
nfc_genl_llc_send_sdres(struct nfc_dev * dev,struct hlist_head * sdres_list)373 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
374 {
375 struct sk_buff *msg;
376 struct nlattr *sdp_attr, *uri_attr;
377 struct nfc_llcp_sdp_tlv *sdres;
378 struct hlist_node *n;
379 void *hdr;
380 int rc = -EMSGSIZE;
381 int i;
382
383 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
384 if (!msg)
385 return -ENOMEM;
386
387 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
388 NFC_EVENT_LLC_SDRES);
389 if (!hdr)
390 goto free_msg;
391
392 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
393 goto nla_put_failure;
394
395 sdp_attr = nla_nest_start(msg, NFC_ATTR_LLC_SDP);
396 if (sdp_attr == NULL) {
397 rc = -ENOMEM;
398 goto nla_put_failure;
399 }
400
401 i = 1;
402 hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
403 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
404
405 uri_attr = nla_nest_start(msg, i++);
406 if (uri_attr == NULL) {
407 rc = -ENOMEM;
408 goto nla_put_failure;
409 }
410
411 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
412 goto nla_put_failure;
413
414 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
415 goto nla_put_failure;
416
417 nla_nest_end(msg, uri_attr);
418
419 hlist_del(&sdres->node);
420
421 nfc_llcp_free_sdp_tlv(sdres);
422 }
423
424 nla_nest_end(msg, sdp_attr);
425
426 genlmsg_end(msg, hdr);
427
428 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
429
430 nla_put_failure:
431 free_msg:
432 nlmsg_free(msg);
433
434 nfc_llcp_free_sdp_tlv_list(sdres_list);
435
436 return rc;
437 }
438
nfc_genl_se_added(struct nfc_dev * dev,u32 se_idx,u16 type)439 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
440 {
441 struct sk_buff *msg;
442 void *hdr;
443
444 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
445 if (!msg)
446 return -ENOMEM;
447
448 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
449 NFC_EVENT_SE_ADDED);
450 if (!hdr)
451 goto free_msg;
452
453 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
454 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
455 nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
456 goto nla_put_failure;
457
458 genlmsg_end(msg, hdr);
459
460 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
461
462 return 0;
463
464 nla_put_failure:
465 free_msg:
466 nlmsg_free(msg);
467 return -EMSGSIZE;
468 }
469
nfc_genl_se_removed(struct nfc_dev * dev,u32 se_idx)470 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
471 {
472 struct sk_buff *msg;
473 void *hdr;
474
475 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
476 if (!msg)
477 return -ENOMEM;
478
479 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
480 NFC_EVENT_SE_REMOVED);
481 if (!hdr)
482 goto free_msg;
483
484 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
485 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
486 goto nla_put_failure;
487
488 genlmsg_end(msg, hdr);
489
490 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
491
492 return 0;
493
494 nla_put_failure:
495 free_msg:
496 nlmsg_free(msg);
497 return -EMSGSIZE;
498 }
499
nfc_genl_se_transaction(struct nfc_dev * dev,u8 se_idx,struct nfc_evt_transaction * evt_transaction)500 int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
501 struct nfc_evt_transaction *evt_transaction)
502 {
503 struct nfc_se *se;
504 struct sk_buff *msg;
505 void *hdr;
506
507 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
508 if (!msg)
509 return -ENOMEM;
510
511 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
512 NFC_EVENT_SE_TRANSACTION);
513 if (!hdr)
514 goto free_msg;
515
516 se = nfc_find_se(dev, se_idx);
517 if (!se)
518 goto free_msg;
519
520 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
521 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
522 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||
523 nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,
524 evt_transaction->aid) ||
525 nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,
526 evt_transaction->params))
527 goto nla_put_failure;
528
529 /* evt_transaction is no more used */
530 devm_kfree(&dev->dev, evt_transaction);
531
532 genlmsg_end(msg, hdr);
533
534 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
535
536 return 0;
537
538 nla_put_failure:
539 free_msg:
540 /* evt_transaction is no more used */
541 devm_kfree(&dev->dev, evt_transaction);
542 nlmsg_free(msg);
543 return -EMSGSIZE;
544 }
545
nfc_genl_se_connectivity(struct nfc_dev * dev,u8 se_idx)546 int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
547 {
548 struct nfc_se *se;
549 struct sk_buff *msg;
550 void *hdr;
551
552 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
553 if (!msg)
554 return -ENOMEM;
555
556 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
557 NFC_EVENT_SE_CONNECTIVITY);
558 if (!hdr)
559 goto free_msg;
560
561 se = nfc_find_se(dev, se_idx);
562 if (!se)
563 goto free_msg;
564
565 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
566 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
567 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
568 goto nla_put_failure;
569
570 genlmsg_end(msg, hdr);
571
572 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
573
574 return 0;
575
576 nla_put_failure:
577 free_msg:
578 nlmsg_free(msg);
579 return -EMSGSIZE;
580 }
581
nfc_genl_send_device(struct sk_buff * msg,struct nfc_dev * dev,u32 portid,u32 seq,struct netlink_callback * cb,int flags)582 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
583 u32 portid, u32 seq,
584 struct netlink_callback *cb,
585 int flags)
586 {
587 void *hdr;
588
589 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
590 NFC_CMD_GET_DEVICE);
591 if (!hdr)
592 return -EMSGSIZE;
593
594 if (cb)
595 genl_dump_check_consistent(cb, hdr);
596
597 if (nfc_genl_setup_device_added(dev, msg))
598 goto nla_put_failure;
599
600 genlmsg_end(msg, hdr);
601 return 0;
602
603 nla_put_failure:
604 genlmsg_cancel(msg, hdr);
605 return -EMSGSIZE;
606 }
607
nfc_genl_dump_devices(struct sk_buff * skb,struct netlink_callback * cb)608 static int nfc_genl_dump_devices(struct sk_buff *skb,
609 struct netlink_callback *cb)
610 {
611 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
612 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
613 bool first_call = false;
614
615 if (!iter) {
616 first_call = true;
617 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
618 if (!iter)
619 return -ENOMEM;
620 cb->args[0] = (long) iter;
621 }
622
623 mutex_lock(&nfc_devlist_mutex);
624
625 cb->seq = nfc_devlist_generation;
626
627 if (first_call) {
628 nfc_device_iter_init(iter);
629 dev = nfc_device_iter_next(iter);
630 }
631
632 while (dev) {
633 int rc;
634
635 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
637 if (rc < 0)
638 break;
639
640 dev = nfc_device_iter_next(iter);
641 }
642
643 mutex_unlock(&nfc_devlist_mutex);
644
645 cb->args[1] = (long) dev;
646
647 return skb->len;
648 }
649
nfc_genl_dump_devices_done(struct netlink_callback * cb)650 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
651 {
652 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
653
654 nfc_device_iter_exit(iter);
655 kfree(iter);
656
657 return 0;
658 }
659
nfc_genl_dep_link_up_event(struct nfc_dev * dev,u32 target_idx,u8 comm_mode,u8 rf_mode)660 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
661 u8 comm_mode, u8 rf_mode)
662 {
663 struct sk_buff *msg;
664 void *hdr;
665
666 pr_debug("DEP link is up\n");
667
668 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
669 if (!msg)
670 return -ENOMEM;
671
672 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
673 if (!hdr)
674 goto free_msg;
675
676 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
677 goto nla_put_failure;
678 if (rf_mode == NFC_RF_INITIATOR &&
679 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
680 goto nla_put_failure;
681 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
682 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
683 goto nla_put_failure;
684
685 genlmsg_end(msg, hdr);
686
687 dev->dep_link_up = true;
688
689 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
690
691 return 0;
692
693 nla_put_failure:
694 free_msg:
695 nlmsg_free(msg);
696 return -EMSGSIZE;
697 }
698
nfc_genl_dep_link_down_event(struct nfc_dev * dev)699 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
700 {
701 struct sk_buff *msg;
702 void *hdr;
703
704 pr_debug("DEP link is down\n");
705
706 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
707 if (!msg)
708 return -ENOMEM;
709
710 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
711 NFC_CMD_DEP_LINK_DOWN);
712 if (!hdr)
713 goto free_msg;
714
715 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
716 goto nla_put_failure;
717
718 genlmsg_end(msg, hdr);
719
720 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
721
722 return 0;
723
724 nla_put_failure:
725 free_msg:
726 nlmsg_free(msg);
727 return -EMSGSIZE;
728 }
729
nfc_genl_get_device(struct sk_buff * skb,struct genl_info * info)730 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
731 {
732 struct sk_buff *msg;
733 struct nfc_dev *dev;
734 u32 idx;
735 int rc = -ENOBUFS;
736
737 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
738 return -EINVAL;
739
740 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
741
742 dev = nfc_get_device(idx);
743 if (!dev)
744 return -ENODEV;
745
746 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
747 if (!msg) {
748 rc = -ENOMEM;
749 goto out_putdev;
750 }
751
752 rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
753 NULL, 0);
754 if (rc < 0)
755 goto out_free;
756
757 nfc_put_device(dev);
758
759 return genlmsg_reply(msg, info);
760
761 out_free:
762 nlmsg_free(msg);
763 out_putdev:
764 nfc_put_device(dev);
765 return rc;
766 }
767
nfc_genl_dev_up(struct sk_buff * skb,struct genl_info * info)768 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
769 {
770 struct nfc_dev *dev;
771 int rc;
772 u32 idx;
773
774 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
775 return -EINVAL;
776
777 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
778
779 dev = nfc_get_device(idx);
780 if (!dev)
781 return -ENODEV;
782
783 rc = nfc_dev_up(dev);
784
785 nfc_put_device(dev);
786 return rc;
787 }
788
nfc_genl_dev_down(struct sk_buff * skb,struct genl_info * info)789 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
790 {
791 struct nfc_dev *dev;
792 int rc;
793 u32 idx;
794
795 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
796 return -EINVAL;
797
798 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
799
800 dev = nfc_get_device(idx);
801 if (!dev)
802 return -ENODEV;
803
804 rc = nfc_dev_down(dev);
805
806 nfc_put_device(dev);
807 return rc;
808 }
809
nfc_genl_start_poll(struct sk_buff * skb,struct genl_info * info)810 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
811 {
812 struct nfc_dev *dev;
813 int rc;
814 u32 idx;
815 u32 im_protocols = 0, tm_protocols = 0;
816
817 pr_debug("Poll start\n");
818
819 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
820 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
821 !info->attrs[NFC_ATTR_PROTOCOLS]) &&
822 !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
823 return -EINVAL;
824
825 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
826
827 if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
828 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
829
830 if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
831 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
832 else if (info->attrs[NFC_ATTR_PROTOCOLS])
833 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
834
835 dev = nfc_get_device(idx);
836 if (!dev)
837 return -ENODEV;
838
839 mutex_lock(&dev->genl_data.genl_data_mutex);
840
841 rc = nfc_start_poll(dev, im_protocols, tm_protocols);
842 if (!rc)
843 dev->genl_data.poll_req_portid = info->snd_portid;
844
845 mutex_unlock(&dev->genl_data.genl_data_mutex);
846
847 nfc_put_device(dev);
848 return rc;
849 }
850
nfc_genl_stop_poll(struct sk_buff * skb,struct genl_info * info)851 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
852 {
853 struct nfc_dev *dev;
854 int rc;
855 u32 idx;
856
857 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
858 return -EINVAL;
859
860 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
861
862 dev = nfc_get_device(idx);
863 if (!dev)
864 return -ENODEV;
865
866 device_lock(&dev->dev);
867
868 if (!dev->polling) {
869 device_unlock(&dev->dev);
870 return -EINVAL;
871 }
872
873 device_unlock(&dev->dev);
874
875 mutex_lock(&dev->genl_data.genl_data_mutex);
876
877 if (dev->genl_data.poll_req_portid != info->snd_portid) {
878 rc = -EBUSY;
879 goto out;
880 }
881
882 rc = nfc_stop_poll(dev);
883 dev->genl_data.poll_req_portid = 0;
884
885 out:
886 mutex_unlock(&dev->genl_data.genl_data_mutex);
887 nfc_put_device(dev);
888 return rc;
889 }
890
nfc_genl_activate_target(struct sk_buff * skb,struct genl_info * info)891 static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
892 {
893 struct nfc_dev *dev;
894 u32 device_idx, target_idx, protocol;
895 int rc;
896
897 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
898 !info->attrs[NFC_ATTR_TARGET_INDEX] ||
899 !info->attrs[NFC_ATTR_PROTOCOLS])
900 return -EINVAL;
901
902 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
903
904 dev = nfc_get_device(device_idx);
905 if (!dev)
906 return -ENODEV;
907
908 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
909 protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
910
911 nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
912 rc = nfc_activate_target(dev, target_idx, protocol);
913
914 nfc_put_device(dev);
915 return rc;
916 }
917
nfc_genl_deactivate_target(struct sk_buff * skb,struct genl_info * info)918 static int nfc_genl_deactivate_target(struct sk_buff *skb,
919 struct genl_info *info)
920 {
921 struct nfc_dev *dev;
922 u32 device_idx, target_idx;
923 int rc;
924
925 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
926 return -EINVAL;
927
928 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
929
930 dev = nfc_get_device(device_idx);
931 if (!dev)
932 return -ENODEV;
933
934 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
935
936 rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
937
938 nfc_put_device(dev);
939 return rc;
940 }
941
nfc_genl_dep_link_up(struct sk_buff * skb,struct genl_info * info)942 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
943 {
944 struct nfc_dev *dev;
945 int rc, tgt_idx;
946 u32 idx;
947 u8 comm;
948
949 pr_debug("DEP link up\n");
950
951 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
952 !info->attrs[NFC_ATTR_COMM_MODE])
953 return -EINVAL;
954
955 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
956 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
957 tgt_idx = NFC_TARGET_IDX_ANY;
958 else
959 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
960
961 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
962
963 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
964 return -EINVAL;
965
966 dev = nfc_get_device(idx);
967 if (!dev)
968 return -ENODEV;
969
970 rc = nfc_dep_link_up(dev, tgt_idx, comm);
971
972 nfc_put_device(dev);
973
974 return rc;
975 }
976
nfc_genl_dep_link_down(struct sk_buff * skb,struct genl_info * info)977 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
978 {
979 struct nfc_dev *dev;
980 int rc;
981 u32 idx;
982
983 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
984 return -EINVAL;
985
986 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
987
988 dev = nfc_get_device(idx);
989 if (!dev)
990 return -ENODEV;
991
992 rc = nfc_dep_link_down(dev);
993
994 nfc_put_device(dev);
995 return rc;
996 }
997
nfc_genl_send_params(struct sk_buff * msg,struct nfc_llcp_local * local,u32 portid,u32 seq)998 static int nfc_genl_send_params(struct sk_buff *msg,
999 struct nfc_llcp_local *local,
1000 u32 portid, u32 seq)
1001 {
1002 void *hdr;
1003
1004 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
1005 NFC_CMD_LLC_GET_PARAMS);
1006 if (!hdr)
1007 return -EMSGSIZE;
1008
1009 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
1010 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
1011 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1012 nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1013 goto nla_put_failure;
1014
1015 genlmsg_end(msg, hdr);
1016 return 0;
1017
1018 nla_put_failure:
1019 genlmsg_cancel(msg, hdr);
1020 return -EMSGSIZE;
1021 }
1022
nfc_genl_llc_get_params(struct sk_buff * skb,struct genl_info * info)1023 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1024 {
1025 struct nfc_dev *dev;
1026 struct nfc_llcp_local *local;
1027 int rc = 0;
1028 struct sk_buff *msg = NULL;
1029 u32 idx;
1030
1031 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1032 return -EINVAL;
1033
1034 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1035
1036 dev = nfc_get_device(idx);
1037 if (!dev)
1038 return -ENODEV;
1039
1040 device_lock(&dev->dev);
1041
1042 local = nfc_llcp_find_local(dev);
1043 if (!local) {
1044 rc = -ENODEV;
1045 goto exit;
1046 }
1047
1048 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1049 if (!msg) {
1050 rc = -ENOMEM;
1051 goto exit;
1052 }
1053
1054 rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1055
1056 exit:
1057 device_unlock(&dev->dev);
1058
1059 nfc_put_device(dev);
1060
1061 if (rc < 0) {
1062 if (msg)
1063 nlmsg_free(msg);
1064
1065 return rc;
1066 }
1067
1068 return genlmsg_reply(msg, info);
1069 }
1070
nfc_genl_llc_set_params(struct sk_buff * skb,struct genl_info * info)1071 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1072 {
1073 struct nfc_dev *dev;
1074 struct nfc_llcp_local *local;
1075 u8 rw = 0;
1076 u16 miux = 0;
1077 u32 idx;
1078 int rc = 0;
1079
1080 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1081 (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1082 !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1083 !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1084 return -EINVAL;
1085
1086 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1087 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1088
1089 if (rw > LLCP_MAX_RW)
1090 return -EINVAL;
1091 }
1092
1093 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1094 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1095
1096 if (miux > LLCP_MAX_MIUX)
1097 return -EINVAL;
1098 }
1099
1100 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1101
1102 dev = nfc_get_device(idx);
1103 if (!dev)
1104 return -ENODEV;
1105
1106 device_lock(&dev->dev);
1107
1108 local = nfc_llcp_find_local(dev);
1109 if (!local) {
1110 nfc_put_device(dev);
1111 rc = -ENODEV;
1112 goto exit;
1113 }
1114
1115 if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1116 if (dev->dep_link_up) {
1117 rc = -EINPROGRESS;
1118 goto exit;
1119 }
1120
1121 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1122 }
1123
1124 if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1125 local->rw = rw;
1126
1127 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1128 local->miux = cpu_to_be16(miux);
1129
1130 exit:
1131 device_unlock(&dev->dev);
1132
1133 nfc_put_device(dev);
1134
1135 return rc;
1136 }
1137
nfc_genl_llc_sdreq(struct sk_buff * skb,struct genl_info * info)1138 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1139 {
1140 struct nfc_dev *dev;
1141 struct nfc_llcp_local *local;
1142 struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1143 u32 idx;
1144 u8 tid;
1145 char *uri;
1146 int rc = 0, rem;
1147 size_t uri_len, tlvs_len;
1148 struct hlist_head sdreq_list;
1149 struct nfc_llcp_sdp_tlv *sdreq;
1150
1151 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1152 !info->attrs[NFC_ATTR_LLC_SDP])
1153 return -EINVAL;
1154
1155 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1156
1157 dev = nfc_get_device(idx);
1158 if (!dev)
1159 return -ENODEV;
1160
1161 device_lock(&dev->dev);
1162
1163 if (dev->dep_link_up == false) {
1164 rc = -ENOLINK;
1165 goto exit;
1166 }
1167
1168 local = nfc_llcp_find_local(dev);
1169 if (!local) {
1170 nfc_put_device(dev);
1171 rc = -ENODEV;
1172 goto exit;
1173 }
1174
1175 INIT_HLIST_HEAD(&sdreq_list);
1176
1177 tlvs_len = 0;
1178
1179 nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1180 rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
1181 nfc_sdp_genl_policy, info->extack);
1182
1183 if (rc != 0) {
1184 rc = -EINVAL;
1185 goto exit;
1186 }
1187
1188 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1189 continue;
1190
1191 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1192 if (uri_len == 0)
1193 continue;
1194
1195 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1196 if (uri == NULL || *uri == 0)
1197 continue;
1198
1199 tid = local->sdreq_next_tid++;
1200
1201 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1202 if (sdreq == NULL) {
1203 rc = -ENOMEM;
1204 goto exit;
1205 }
1206
1207 tlvs_len += sdreq->tlv_len;
1208
1209 hlist_add_head(&sdreq->node, &sdreq_list);
1210 }
1211
1212 if (hlist_empty(&sdreq_list)) {
1213 rc = -EINVAL;
1214 goto exit;
1215 }
1216
1217 rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1218 exit:
1219 device_unlock(&dev->dev);
1220
1221 nfc_put_device(dev);
1222
1223 return rc;
1224 }
1225
nfc_genl_fw_download(struct sk_buff * skb,struct genl_info * info)1226 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1227 {
1228 struct nfc_dev *dev;
1229 int rc;
1230 u32 idx;
1231 char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1232
1233 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1234 return -EINVAL;
1235
1236 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1237
1238 dev = nfc_get_device(idx);
1239 if (!dev)
1240 return -ENODEV;
1241
1242 nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1243 sizeof(firmware_name));
1244
1245 rc = nfc_fw_download(dev, firmware_name);
1246
1247 nfc_put_device(dev);
1248 return rc;
1249 }
1250
nfc_genl_fw_download_done(struct nfc_dev * dev,const char * firmware_name,u32 result)1251 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1252 u32 result)
1253 {
1254 struct sk_buff *msg;
1255 void *hdr;
1256
1257 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1258 if (!msg)
1259 return -ENOMEM;
1260
1261 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1262 NFC_CMD_FW_DOWNLOAD);
1263 if (!hdr)
1264 goto free_msg;
1265
1266 if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1267 nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1268 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1269 goto nla_put_failure;
1270
1271 genlmsg_end(msg, hdr);
1272
1273 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1274
1275 return 0;
1276
1277 nla_put_failure:
1278 free_msg:
1279 nlmsg_free(msg);
1280 return -EMSGSIZE;
1281 }
1282
nfc_genl_enable_se(struct sk_buff * skb,struct genl_info * info)1283 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1284 {
1285 struct nfc_dev *dev;
1286 int rc;
1287 u32 idx, se_idx;
1288
1289 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1290 !info->attrs[NFC_ATTR_SE_INDEX])
1291 return -EINVAL;
1292
1293 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1294 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1295
1296 dev = nfc_get_device(idx);
1297 if (!dev)
1298 return -ENODEV;
1299
1300 rc = nfc_enable_se(dev, se_idx);
1301
1302 nfc_put_device(dev);
1303 return rc;
1304 }
1305
nfc_genl_disable_se(struct sk_buff * skb,struct genl_info * info)1306 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1307 {
1308 struct nfc_dev *dev;
1309 int rc;
1310 u32 idx, se_idx;
1311
1312 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1313 !info->attrs[NFC_ATTR_SE_INDEX])
1314 return -EINVAL;
1315
1316 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1317 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1318
1319 dev = nfc_get_device(idx);
1320 if (!dev)
1321 return -ENODEV;
1322
1323 rc = nfc_disable_se(dev, se_idx);
1324
1325 nfc_put_device(dev);
1326 return rc;
1327 }
1328
nfc_genl_send_se(struct sk_buff * msg,struct nfc_dev * dev,u32 portid,u32 seq,struct netlink_callback * cb,int flags)1329 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1330 u32 portid, u32 seq,
1331 struct netlink_callback *cb,
1332 int flags)
1333 {
1334 void *hdr;
1335 struct nfc_se *se, *n;
1336
1337 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1338 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1339 NFC_CMD_GET_SE);
1340 if (!hdr)
1341 goto nla_put_failure;
1342
1343 if (cb)
1344 genl_dump_check_consistent(cb, hdr);
1345
1346 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1347 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1348 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1349 goto nla_put_failure;
1350
1351 genlmsg_end(msg, hdr);
1352 }
1353
1354 return 0;
1355
1356 nla_put_failure:
1357 genlmsg_cancel(msg, hdr);
1358 return -EMSGSIZE;
1359 }
1360
nfc_genl_dump_ses(struct sk_buff * skb,struct netlink_callback * cb)1361 static int nfc_genl_dump_ses(struct sk_buff *skb,
1362 struct netlink_callback *cb)
1363 {
1364 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1365 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1366 bool first_call = false;
1367
1368 if (!iter) {
1369 first_call = true;
1370 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1371 if (!iter)
1372 return -ENOMEM;
1373 cb->args[0] = (long) iter;
1374 }
1375
1376 mutex_lock(&nfc_devlist_mutex);
1377
1378 cb->seq = nfc_devlist_generation;
1379
1380 if (first_call) {
1381 nfc_device_iter_init(iter);
1382 dev = nfc_device_iter_next(iter);
1383 }
1384
1385 while (dev) {
1386 int rc;
1387
1388 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1389 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1390 if (rc < 0)
1391 break;
1392
1393 dev = nfc_device_iter_next(iter);
1394 }
1395
1396 mutex_unlock(&nfc_devlist_mutex);
1397
1398 cb->args[1] = (long) dev;
1399
1400 return skb->len;
1401 }
1402
nfc_genl_dump_ses_done(struct netlink_callback * cb)1403 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1404 {
1405 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1406
1407 nfc_device_iter_exit(iter);
1408 kfree(iter);
1409
1410 return 0;
1411 }
1412
nfc_se_io(struct nfc_dev * dev,u32 se_idx,u8 * apdu,size_t apdu_length,se_io_cb_t cb,void * cb_context)1413 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1414 u8 *apdu, size_t apdu_length,
1415 se_io_cb_t cb, void *cb_context)
1416 {
1417 struct nfc_se *se;
1418 int rc;
1419
1420 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1421
1422 device_lock(&dev->dev);
1423
1424 if (!device_is_registered(&dev->dev)) {
1425 rc = -ENODEV;
1426 goto error;
1427 }
1428
1429 if (!dev->dev_up) {
1430 rc = -ENODEV;
1431 goto error;
1432 }
1433
1434 if (!dev->ops->se_io) {
1435 rc = -EOPNOTSUPP;
1436 goto error;
1437 }
1438
1439 se = nfc_find_se(dev, se_idx);
1440 if (!se) {
1441 rc = -EINVAL;
1442 goto error;
1443 }
1444
1445 if (se->state != NFC_SE_ENABLED) {
1446 rc = -ENODEV;
1447 goto error;
1448 }
1449
1450 rc = dev->ops->se_io(dev, se_idx, apdu,
1451 apdu_length, cb, cb_context);
1452
1453 error:
1454 device_unlock(&dev->dev);
1455 return rc;
1456 }
1457
1458 struct se_io_ctx {
1459 u32 dev_idx;
1460 u32 se_idx;
1461 };
1462
se_io_cb(void * context,u8 * apdu,size_t apdu_len,int err)1463 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1464 {
1465 struct se_io_ctx *ctx = context;
1466 struct sk_buff *msg;
1467 void *hdr;
1468
1469 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1470 if (!msg) {
1471 kfree(ctx);
1472 return;
1473 }
1474
1475 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1476 NFC_CMD_SE_IO);
1477 if (!hdr)
1478 goto free_msg;
1479
1480 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1481 nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1482 nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1483 goto nla_put_failure;
1484
1485 genlmsg_end(msg, hdr);
1486
1487 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1488
1489 kfree(ctx);
1490
1491 return;
1492
1493 nla_put_failure:
1494 free_msg:
1495 nlmsg_free(msg);
1496 kfree(ctx);
1497
1498 return;
1499 }
1500
nfc_genl_se_io(struct sk_buff * skb,struct genl_info * info)1501 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1502 {
1503 struct nfc_dev *dev;
1504 struct se_io_ctx *ctx;
1505 u32 dev_idx, se_idx;
1506 u8 *apdu;
1507 size_t apdu_len;
1508
1509 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1510 !info->attrs[NFC_ATTR_SE_INDEX] ||
1511 !info->attrs[NFC_ATTR_SE_APDU])
1512 return -EINVAL;
1513
1514 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1515 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1516
1517 dev = nfc_get_device(dev_idx);
1518 if (!dev)
1519 return -ENODEV;
1520
1521 if (!dev->ops || !dev->ops->se_io)
1522 return -ENOTSUPP;
1523
1524 apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1525 if (apdu_len == 0)
1526 return -EINVAL;
1527
1528 apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1529 if (!apdu)
1530 return -EINVAL;
1531
1532 ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1533 if (!ctx)
1534 return -ENOMEM;
1535
1536 ctx->dev_idx = dev_idx;
1537 ctx->se_idx = se_idx;
1538
1539 return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1540 }
1541
nfc_genl_vendor_cmd(struct sk_buff * skb,struct genl_info * info)1542 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1543 struct genl_info *info)
1544 {
1545 struct nfc_dev *dev;
1546 struct nfc_vendor_cmd *cmd;
1547 u32 dev_idx, vid, subcmd;
1548 u8 *data;
1549 size_t data_len;
1550 int i, err;
1551
1552 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1553 !info->attrs[NFC_ATTR_VENDOR_ID] ||
1554 !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1555 return -EINVAL;
1556
1557 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1558 vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1559 subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1560
1561 dev = nfc_get_device(dev_idx);
1562 if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
1563 return -ENODEV;
1564
1565 if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1566 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1567 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1568 if (data_len == 0)
1569 return -EINVAL;
1570 } else {
1571 data = NULL;
1572 data_len = 0;
1573 }
1574
1575 for (i = 0; i < dev->n_vendor_cmds; i++) {
1576 cmd = &dev->vendor_cmds[i];
1577
1578 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1579 continue;
1580
1581 dev->cur_cmd_info = info;
1582 err = cmd->doit(dev, data, data_len);
1583 dev->cur_cmd_info = NULL;
1584 return err;
1585 }
1586
1587 return -EOPNOTSUPP;
1588 }
1589
1590 /* message building helper */
nfc_hdr_put(struct sk_buff * skb,u32 portid,u32 seq,int flags,u8 cmd)1591 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1592 int flags, u8 cmd)
1593 {
1594 /* since there is no private header just add the generic one */
1595 return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1596 }
1597
1598 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)1599 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1600 u32 portid, u32 seq,
1601 enum nfc_attrs attr,
1602 u32 oui, u32 subcmd, gfp_t gfp)
1603 {
1604 struct sk_buff *skb;
1605 void *hdr;
1606
1607 skb = nlmsg_new(approxlen + 100, gfp);
1608 if (!skb)
1609 return NULL;
1610
1611 hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1612 if (!hdr) {
1613 kfree_skb(skb);
1614 return NULL;
1615 }
1616
1617 if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1618 goto nla_put_failure;
1619 if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1620 goto nla_put_failure;
1621 if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1622 goto nla_put_failure;
1623
1624 ((void **)skb->cb)[0] = dev;
1625 ((void **)skb->cb)[1] = hdr;
1626
1627 return skb;
1628
1629 nla_put_failure:
1630 kfree_skb(skb);
1631 return NULL;
1632 }
1633
__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev * dev,enum nfc_attrs attr,u32 oui,u32 subcmd,int approxlen)1634 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1635 enum nfc_attrs attr,
1636 u32 oui, u32 subcmd,
1637 int approxlen)
1638 {
1639 if (WARN_ON(!dev->cur_cmd_info))
1640 return NULL;
1641
1642 return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1643 dev->cur_cmd_info->snd_portid,
1644 dev->cur_cmd_info->snd_seq, attr,
1645 oui, subcmd, GFP_KERNEL);
1646 }
1647 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1648
nfc_vendor_cmd_reply(struct sk_buff * skb)1649 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1650 {
1651 struct nfc_dev *dev = ((void **)skb->cb)[0];
1652 void *hdr = ((void **)skb->cb)[1];
1653
1654 /* clear CB data for netlink core to own from now on */
1655 memset(skb->cb, 0, sizeof(skb->cb));
1656
1657 if (WARN_ON(!dev->cur_cmd_info)) {
1658 kfree_skb(skb);
1659 return -EINVAL;
1660 }
1661
1662 genlmsg_end(skb, hdr);
1663 return genlmsg_reply(skb, dev->cur_cmd_info);
1664 }
1665 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1666
1667 static const struct genl_ops nfc_genl_ops[] = {
1668 {
1669 .cmd = NFC_CMD_GET_DEVICE,
1670 .doit = nfc_genl_get_device,
1671 .dumpit = nfc_genl_dump_devices,
1672 .done = nfc_genl_dump_devices_done,
1673 .policy = nfc_genl_policy,
1674 },
1675 {
1676 .cmd = NFC_CMD_DEV_UP,
1677 .doit = nfc_genl_dev_up,
1678 .policy = nfc_genl_policy,
1679 },
1680 {
1681 .cmd = NFC_CMD_DEV_DOWN,
1682 .doit = nfc_genl_dev_down,
1683 .policy = nfc_genl_policy,
1684 },
1685 {
1686 .cmd = NFC_CMD_START_POLL,
1687 .doit = nfc_genl_start_poll,
1688 .policy = nfc_genl_policy,
1689 },
1690 {
1691 .cmd = NFC_CMD_STOP_POLL,
1692 .doit = nfc_genl_stop_poll,
1693 .policy = nfc_genl_policy,
1694 },
1695 {
1696 .cmd = NFC_CMD_DEP_LINK_UP,
1697 .doit = nfc_genl_dep_link_up,
1698 .policy = nfc_genl_policy,
1699 },
1700 {
1701 .cmd = NFC_CMD_DEP_LINK_DOWN,
1702 .doit = nfc_genl_dep_link_down,
1703 .policy = nfc_genl_policy,
1704 },
1705 {
1706 .cmd = NFC_CMD_GET_TARGET,
1707 .dumpit = nfc_genl_dump_targets,
1708 .done = nfc_genl_dump_targets_done,
1709 .policy = nfc_genl_policy,
1710 },
1711 {
1712 .cmd = NFC_CMD_LLC_GET_PARAMS,
1713 .doit = nfc_genl_llc_get_params,
1714 .policy = nfc_genl_policy,
1715 },
1716 {
1717 .cmd = NFC_CMD_LLC_SET_PARAMS,
1718 .doit = nfc_genl_llc_set_params,
1719 .policy = nfc_genl_policy,
1720 },
1721 {
1722 .cmd = NFC_CMD_LLC_SDREQ,
1723 .doit = nfc_genl_llc_sdreq,
1724 .policy = nfc_genl_policy,
1725 },
1726 {
1727 .cmd = NFC_CMD_FW_DOWNLOAD,
1728 .doit = nfc_genl_fw_download,
1729 .policy = nfc_genl_policy,
1730 },
1731 {
1732 .cmd = NFC_CMD_ENABLE_SE,
1733 .doit = nfc_genl_enable_se,
1734 .policy = nfc_genl_policy,
1735 },
1736 {
1737 .cmd = NFC_CMD_DISABLE_SE,
1738 .doit = nfc_genl_disable_se,
1739 .policy = nfc_genl_policy,
1740 },
1741 {
1742 .cmd = NFC_CMD_GET_SE,
1743 .dumpit = nfc_genl_dump_ses,
1744 .done = nfc_genl_dump_ses_done,
1745 .policy = nfc_genl_policy,
1746 },
1747 {
1748 .cmd = NFC_CMD_SE_IO,
1749 .doit = nfc_genl_se_io,
1750 .policy = nfc_genl_policy,
1751 },
1752 {
1753 .cmd = NFC_CMD_ACTIVATE_TARGET,
1754 .doit = nfc_genl_activate_target,
1755 .policy = nfc_genl_policy,
1756 },
1757 {
1758 .cmd = NFC_CMD_VENDOR,
1759 .doit = nfc_genl_vendor_cmd,
1760 .policy = nfc_genl_policy,
1761 },
1762 {
1763 .cmd = NFC_CMD_DEACTIVATE_TARGET,
1764 .doit = nfc_genl_deactivate_target,
1765 .policy = nfc_genl_policy,
1766 },
1767 };
1768
1769 static struct genl_family nfc_genl_family __ro_after_init = {
1770 .hdrsize = 0,
1771 .name = NFC_GENL_NAME,
1772 .version = NFC_GENL_VERSION,
1773 .maxattr = NFC_ATTR_MAX,
1774 .module = THIS_MODULE,
1775 .ops = nfc_genl_ops,
1776 .n_ops = ARRAY_SIZE(nfc_genl_ops),
1777 .mcgrps = nfc_genl_mcgrps,
1778 .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1779 };
1780
1781
1782 struct urelease_work {
1783 struct work_struct w;
1784 u32 portid;
1785 };
1786
nfc_urelease_event_work(struct work_struct * work)1787 static void nfc_urelease_event_work(struct work_struct *work)
1788 {
1789 struct urelease_work *w = container_of(work, struct urelease_work, w);
1790 struct class_dev_iter iter;
1791 struct nfc_dev *dev;
1792
1793 pr_debug("portid %d\n", w->portid);
1794
1795 mutex_lock(&nfc_devlist_mutex);
1796
1797 nfc_device_iter_init(&iter);
1798 dev = nfc_device_iter_next(&iter);
1799
1800 while (dev) {
1801 mutex_lock(&dev->genl_data.genl_data_mutex);
1802
1803 if (dev->genl_data.poll_req_portid == w->portid) {
1804 nfc_stop_poll(dev);
1805 dev->genl_data.poll_req_portid = 0;
1806 }
1807
1808 mutex_unlock(&dev->genl_data.genl_data_mutex);
1809
1810 dev = nfc_device_iter_next(&iter);
1811 }
1812
1813 nfc_device_iter_exit(&iter);
1814
1815 mutex_unlock(&nfc_devlist_mutex);
1816
1817 kfree(w);
1818 }
1819
nfc_genl_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)1820 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1821 unsigned long event, void *ptr)
1822 {
1823 struct netlink_notify *n = ptr;
1824 struct urelease_work *w;
1825
1826 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1827 goto out;
1828
1829 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1830
1831 w = kmalloc(sizeof(*w), GFP_ATOMIC);
1832 if (w) {
1833 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
1834 w->portid = n->portid;
1835 schedule_work((struct work_struct *) w);
1836 }
1837
1838 out:
1839 return NOTIFY_DONE;
1840 }
1841
nfc_genl_data_init(struct nfc_genl_data * genl_data)1842 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1843 {
1844 genl_data->poll_req_portid = 0;
1845 mutex_init(&genl_data->genl_data_mutex);
1846 }
1847
nfc_genl_data_exit(struct nfc_genl_data * genl_data)1848 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1849 {
1850 mutex_destroy(&genl_data->genl_data_mutex);
1851 }
1852
1853 static struct notifier_block nl_notifier = {
1854 .notifier_call = nfc_genl_rcv_nl_event,
1855 };
1856
1857 /**
1858 * nfc_genl_init() - Initialize netlink interface
1859 *
1860 * This initialization function registers the nfc netlink family.
1861 */
nfc_genl_init(void)1862 int __init nfc_genl_init(void)
1863 {
1864 int rc;
1865
1866 rc = genl_register_family(&nfc_genl_family);
1867 if (rc)
1868 return rc;
1869
1870 netlink_register_notifier(&nl_notifier);
1871
1872 return 0;
1873 }
1874
1875 /**
1876 * nfc_genl_exit() - Deinitialize netlink interface
1877 *
1878 * This exit function unregisters the nfc netlink family.
1879 */
nfc_genl_exit(void)1880 void nfc_genl_exit(void)
1881 {
1882 netlink_unregister_notifier(&nl_notifier);
1883 genl_unregister_family(&nfc_genl_family);
1884 }
1885
