1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2011 Instituto Nokia de Tecnologia
4 *
5 * Authors:
6 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
7 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
8 *
9 * Vendor commands implementation based on net/wireless/nl80211.c
10 * which is:
11 *
12 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
13 * Copyright 2013-2014 Intel Mobile Communications GmbH
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
17
18 #include <net/genetlink.h>
19 #include <linux/nfc.h>
20 #include <linux/slab.h>
21
22 #include "nfc.h"
23 #include "llcp.h"
24
25 static const struct genl_multicast_group nfc_genl_mcgrps[] = {
26 { .name = NFC_GENL_MCAST_EVENT_NAME, },
27 };
28
29 static struct genl_family nfc_genl_family;
30 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
31 [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
32 [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
33 .len = NFC_DEVICE_NAME_MAXSIZE },
34 [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
35 [NFC_ATTR_TARGET_INDEX] = { .type = NLA_U32 },
36 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
37 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
38 [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
39 [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
40 [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
41 [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
42 [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
43 [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
44 [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
45 [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
46 .len = NFC_FIRMWARE_NAME_MAXSIZE },
47 [NFC_ATTR_SE_INDEX] = { .type = NLA_U32 },
48 [NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
49 [NFC_ATTR_VENDOR_ID] = { .type = NLA_U32 },
50 [NFC_ATTR_VENDOR_SUBCMD] = { .type = NLA_U32 },
51 [NFC_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
52
53 };
54
55 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
56 [NFC_SDP_ATTR_URI] = { .type = NLA_STRING,
57 .len = U8_MAX - 4 },
58 [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
59 };
60
nfc_genl_send_target(struct sk_buff * msg,struct nfc_target * target,struct netlink_callback * cb,int flags)61 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
62 struct netlink_callback *cb, int flags)
63 {
64 void *hdr;
65
66 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
67 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
68 if (!hdr)
69 return -EMSGSIZE;
70
71 genl_dump_check_consistent(cb, hdr);
72
73 if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
74 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
75 nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
76 nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
77 goto nla_put_failure;
78 if (target->nfcid1_len > 0 &&
79 nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
80 target->nfcid1))
81 goto nla_put_failure;
82 if (target->sensb_res_len > 0 &&
83 nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
84 target->sensb_res))
85 goto nla_put_failure;
86 if (target->sensf_res_len > 0 &&
87 nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
88 target->sensf_res))
89 goto nla_put_failure;
90
91 if (target->is_iso15693) {
92 if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID,
93 target->iso15693_dsfid) ||
94 nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID,
95 sizeof(target->iso15693_uid), target->iso15693_uid))
96 goto nla_put_failure;
97 }
98
99 genlmsg_end(msg, hdr);
100 return 0;
101
102 nla_put_failure:
103 genlmsg_cancel(msg, hdr);
104 return -EMSGSIZE;
105 }
106
__get_device_from_cb(struct netlink_callback * cb)107 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
108 {
109 const struct genl_dumpit_info *info = genl_dumpit_info(cb);
110 struct nfc_dev *dev;
111 u32 idx;
112
113 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
114 return ERR_PTR(-EINVAL);
115
116 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
117
118 dev = nfc_get_device(idx);
119 if (!dev)
120 return ERR_PTR(-ENODEV);
121
122 return dev;
123 }
124
nfc_genl_dump_targets(struct sk_buff * skb,struct netlink_callback * cb)125 static int nfc_genl_dump_targets(struct sk_buff *skb,
126 struct netlink_callback *cb)
127 {
128 int i = cb->args[0];
129 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
130 int rc;
131
132 if (!dev) {
133 dev = __get_device_from_cb(cb);
134 if (IS_ERR(dev))
135 return PTR_ERR(dev);
136
137 cb->args[1] = (long) dev;
138 }
139
140 device_lock(&dev->dev);
141
142 cb->seq = dev->targets_generation;
143
144 while (i < dev->n_targets) {
145 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
146 NLM_F_MULTI);
147 if (rc < 0)
148 break;
149
150 i++;
151 }
152
153 device_unlock(&dev->dev);
154
155 cb->args[0] = i;
156
157 return skb->len;
158 }
159
nfc_genl_dump_targets_done(struct netlink_callback * cb)160 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
161 {
162 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
163
164 if (dev)
165 nfc_put_device(dev);
166
167 return 0;
168 }
169
nfc_genl_targets_found(struct nfc_dev * dev)170 int nfc_genl_targets_found(struct nfc_dev *dev)
171 {
172 struct sk_buff *msg;
173 void *hdr;
174
175 dev->genl_data.poll_req_portid = 0;
176
177 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
178 if (!msg)
179 return -ENOMEM;
180
181 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
182 NFC_EVENT_TARGETS_FOUND);
183 if (!hdr)
184 goto free_msg;
185
186 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
187 goto nla_put_failure;
188
189 genlmsg_end(msg, hdr);
190
191 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
192
193 nla_put_failure:
194 free_msg:
195 nlmsg_free(msg);
196 return -EMSGSIZE;
197 }
198
nfc_genl_target_lost(struct nfc_dev * dev,u32 target_idx)199 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
200 {
201 struct sk_buff *msg;
202 void *hdr;
203
204 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
205 if (!msg)
206 return -ENOMEM;
207
208 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
209 NFC_EVENT_TARGET_LOST);
210 if (!hdr)
211 goto free_msg;
212
213 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
214 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
215 goto nla_put_failure;
216
217 genlmsg_end(msg, hdr);
218
219 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
220
221 return 0;
222
223 nla_put_failure:
224 free_msg:
225 nlmsg_free(msg);
226 return -EMSGSIZE;
227 }
228
nfc_genl_tm_activated(struct nfc_dev * dev,u32 protocol)229 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
230 {
231 struct sk_buff *msg;
232 void *hdr;
233
234 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
235 if (!msg)
236 return -ENOMEM;
237
238 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
239 NFC_EVENT_TM_ACTIVATED);
240 if (!hdr)
241 goto free_msg;
242
243 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
244 goto nla_put_failure;
245 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
246 goto nla_put_failure;
247
248 genlmsg_end(msg, hdr);
249
250 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
251
252 return 0;
253
254 nla_put_failure:
255 free_msg:
256 nlmsg_free(msg);
257 return -EMSGSIZE;
258 }
259
nfc_genl_tm_deactivated(struct nfc_dev * dev)260 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
261 {
262 struct sk_buff *msg;
263 void *hdr;
264
265 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
266 if (!msg)
267 return -ENOMEM;
268
269 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
270 NFC_EVENT_TM_DEACTIVATED);
271 if (!hdr)
272 goto free_msg;
273
274 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
275 goto nla_put_failure;
276
277 genlmsg_end(msg, hdr);
278
279 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
280
281 return 0;
282
283 nla_put_failure:
284 free_msg:
285 nlmsg_free(msg);
286 return -EMSGSIZE;
287 }
288
nfc_genl_setup_device_added(struct nfc_dev * dev,struct sk_buff * msg)289 static int nfc_genl_setup_device_added(struct nfc_dev *dev, struct sk_buff *msg)
290 {
291 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
292 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
293 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
294 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
295 nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
296 return -1;
297 return 0;
298 }
299
nfc_genl_device_added(struct nfc_dev * dev)300 int nfc_genl_device_added(struct nfc_dev *dev)
301 {
302 struct sk_buff *msg;
303 void *hdr;
304
305 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
306 if (!msg)
307 return -ENOMEM;
308
309 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
310 NFC_EVENT_DEVICE_ADDED);
311 if (!hdr)
312 goto free_msg;
313
314 if (nfc_genl_setup_device_added(dev, msg))
315 goto nla_put_failure;
316
317 genlmsg_end(msg, hdr);
318
319 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
320
321 return 0;
322
323 nla_put_failure:
324 free_msg:
325 nlmsg_free(msg);
326 return -EMSGSIZE;
327 }
328
nfc_genl_device_removed(struct nfc_dev * dev)329 int nfc_genl_device_removed(struct nfc_dev *dev)
330 {
331 struct sk_buff *msg;
332 void *hdr;
333
334 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
335 if (!msg)
336 return -ENOMEM;
337
338 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
339 NFC_EVENT_DEVICE_REMOVED);
340 if (!hdr)
341 goto free_msg;
342
343 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
344 goto nla_put_failure;
345
346 genlmsg_end(msg, hdr);
347
348 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
349
350 return 0;
351
352 nla_put_failure:
353 free_msg:
354 nlmsg_free(msg);
355 return -EMSGSIZE;
356 }
357
nfc_genl_llc_send_sdres(struct nfc_dev * dev,struct hlist_head * sdres_list)358 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
359 {
360 struct sk_buff *msg;
361 struct nlattr *sdp_attr, *uri_attr;
362 struct nfc_llcp_sdp_tlv *sdres;
363 struct hlist_node *n;
364 void *hdr;
365 int rc = -EMSGSIZE;
366 int i;
367
368 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
369 if (!msg)
370 return -ENOMEM;
371
372 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
373 NFC_EVENT_LLC_SDRES);
374 if (!hdr)
375 goto free_msg;
376
377 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
378 goto nla_put_failure;
379
380 sdp_attr = nla_nest_start_noflag(msg, NFC_ATTR_LLC_SDP);
381 if (sdp_attr == NULL) {
382 rc = -ENOMEM;
383 goto nla_put_failure;
384 }
385
386 i = 1;
387 hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
388 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
389
390 uri_attr = nla_nest_start_noflag(msg, i++);
391 if (uri_attr == NULL) {
392 rc = -ENOMEM;
393 goto nla_put_failure;
394 }
395
396 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
397 goto nla_put_failure;
398
399 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
400 goto nla_put_failure;
401
402 nla_nest_end(msg, uri_attr);
403
404 hlist_del(&sdres->node);
405
406 nfc_llcp_free_sdp_tlv(sdres);
407 }
408
409 nla_nest_end(msg, sdp_attr);
410
411 genlmsg_end(msg, hdr);
412
413 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
414
415 nla_put_failure:
416 free_msg:
417 nlmsg_free(msg);
418
419 nfc_llcp_free_sdp_tlv_list(sdres_list);
420
421 return rc;
422 }
423
nfc_genl_se_added(struct nfc_dev * dev,u32 se_idx,u16 type)424 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
425 {
426 struct sk_buff *msg;
427 void *hdr;
428
429 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
430 if (!msg)
431 return -ENOMEM;
432
433 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
434 NFC_EVENT_SE_ADDED);
435 if (!hdr)
436 goto free_msg;
437
438 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
439 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
440 nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
441 goto nla_put_failure;
442
443 genlmsg_end(msg, hdr);
444
445 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
446
447 return 0;
448
449 nla_put_failure:
450 free_msg:
451 nlmsg_free(msg);
452 return -EMSGSIZE;
453 }
454
nfc_genl_se_removed(struct nfc_dev * dev,u32 se_idx)455 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
456 {
457 struct sk_buff *msg;
458 void *hdr;
459
460 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
461 if (!msg)
462 return -ENOMEM;
463
464 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
465 NFC_EVENT_SE_REMOVED);
466 if (!hdr)
467 goto free_msg;
468
469 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
470 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
471 goto nla_put_failure;
472
473 genlmsg_end(msg, hdr);
474
475 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
476
477 return 0;
478
479 nla_put_failure:
480 free_msg:
481 nlmsg_free(msg);
482 return -EMSGSIZE;
483 }
484
nfc_genl_se_transaction(struct nfc_dev * dev,u8 se_idx,struct nfc_evt_transaction * evt_transaction)485 int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
486 struct nfc_evt_transaction *evt_transaction)
487 {
488 struct nfc_se *se;
489 struct sk_buff *msg;
490 void *hdr;
491
492 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
493 if (!msg)
494 return -ENOMEM;
495
496 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
497 NFC_EVENT_SE_TRANSACTION);
498 if (!hdr)
499 goto free_msg;
500
501 se = nfc_find_se(dev, se_idx);
502 if (!se)
503 goto free_msg;
504
505 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
506 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
507 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||
508 nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,
509 evt_transaction->aid) ||
510 nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,
511 evt_transaction->params))
512 goto nla_put_failure;
513
514 /* evt_transaction is no more used */
515 devm_kfree(&dev->dev, evt_transaction);
516
517 genlmsg_end(msg, hdr);
518
519 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
520
521 return 0;
522
523 nla_put_failure:
524 free_msg:
525 /* evt_transaction is no more used */
526 devm_kfree(&dev->dev, evt_transaction);
527 nlmsg_free(msg);
528 return -EMSGSIZE;
529 }
530
nfc_genl_se_connectivity(struct nfc_dev * dev,u8 se_idx)531 int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
532 {
533 const struct nfc_se *se;
534 struct sk_buff *msg;
535 void *hdr;
536
537 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
538 if (!msg)
539 return -ENOMEM;
540
541 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
542 NFC_EVENT_SE_CONNECTIVITY);
543 if (!hdr)
544 goto free_msg;
545
546 se = nfc_find_se(dev, se_idx);
547 if (!se)
548 goto free_msg;
549
550 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
551 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
552 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
553 goto nla_put_failure;
554
555 genlmsg_end(msg, hdr);
556
557 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
558
559 return 0;
560
561 nla_put_failure:
562 free_msg:
563 nlmsg_free(msg);
564 return -EMSGSIZE;
565 }
566
nfc_genl_send_device(struct sk_buff * msg,struct nfc_dev * dev,u32 portid,u32 seq,struct netlink_callback * cb,int flags)567 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
568 u32 portid, u32 seq,
569 struct netlink_callback *cb,
570 int flags)
571 {
572 void *hdr;
573
574 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
575 NFC_CMD_GET_DEVICE);
576 if (!hdr)
577 return -EMSGSIZE;
578
579 if (cb)
580 genl_dump_check_consistent(cb, hdr);
581
582 if (nfc_genl_setup_device_added(dev, msg))
583 goto nla_put_failure;
584
585 genlmsg_end(msg, hdr);
586 return 0;
587
588 nla_put_failure:
589 genlmsg_cancel(msg, hdr);
590 return -EMSGSIZE;
591 }
592
nfc_genl_dump_devices(struct sk_buff * skb,struct netlink_callback * cb)593 static int nfc_genl_dump_devices(struct sk_buff *skb,
594 struct netlink_callback *cb)
595 {
596 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
597 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
598 bool first_call = false;
599
600 if (!iter) {
601 first_call = true;
602 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
603 if (!iter)
604 return -ENOMEM;
605 cb->args[0] = (long) iter;
606 }
607
608 mutex_lock(&nfc_devlist_mutex);
609
610 cb->seq = nfc_devlist_generation;
611
612 if (first_call) {
613 nfc_device_iter_init(iter);
614 dev = nfc_device_iter_next(iter);
615 }
616
617 while (dev) {
618 int rc;
619
620 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
621 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
622 if (rc < 0)
623 break;
624
625 dev = nfc_device_iter_next(iter);
626 }
627
628 mutex_unlock(&nfc_devlist_mutex);
629
630 cb->args[1] = (long) dev;
631
632 return skb->len;
633 }
634
nfc_genl_dump_devices_done(struct netlink_callback * cb)635 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
636 {
637 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
638
639 nfc_device_iter_exit(iter);
640 kfree(iter);
641
642 return 0;
643 }
644
nfc_genl_dep_link_up_event(struct nfc_dev * dev,u32 target_idx,u8 comm_mode,u8 rf_mode)645 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
646 u8 comm_mode, u8 rf_mode)
647 {
648 struct sk_buff *msg;
649 void *hdr;
650
651 pr_debug("DEP link is up\n");
652
653 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
654 if (!msg)
655 return -ENOMEM;
656
657 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
658 if (!hdr)
659 goto free_msg;
660
661 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
662 goto nla_put_failure;
663 if (rf_mode == NFC_RF_INITIATOR &&
664 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
665 goto nla_put_failure;
666 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
667 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
668 goto nla_put_failure;
669
670 genlmsg_end(msg, hdr);
671
672 dev->dep_link_up = true;
673
674 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
675
676 return 0;
677
678 nla_put_failure:
679 free_msg:
680 nlmsg_free(msg);
681 return -EMSGSIZE;
682 }
683
nfc_genl_dep_link_down_event(struct nfc_dev * dev)684 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
685 {
686 struct sk_buff *msg;
687 void *hdr;
688
689 pr_debug("DEP link is down\n");
690
691 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
692 if (!msg)
693 return -ENOMEM;
694
695 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
696 NFC_CMD_DEP_LINK_DOWN);
697 if (!hdr)
698 goto free_msg;
699
700 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
701 goto nla_put_failure;
702
703 genlmsg_end(msg, hdr);
704
705 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
706
707 return 0;
708
709 nla_put_failure:
710 free_msg:
711 nlmsg_free(msg);
712 return -EMSGSIZE;
713 }
714
nfc_genl_get_device(struct sk_buff * skb,struct genl_info * info)715 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
716 {
717 struct sk_buff *msg;
718 struct nfc_dev *dev;
719 u32 idx;
720 int rc = -ENOBUFS;
721
722 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
723 return -EINVAL;
724
725 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
726
727 dev = nfc_get_device(idx);
728 if (!dev)
729 return -ENODEV;
730
731 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
732 if (!msg) {
733 rc = -ENOMEM;
734 goto out_putdev;
735 }
736
737 rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
738 NULL, 0);
739 if (rc < 0)
740 goto out_free;
741
742 nfc_put_device(dev);
743
744 return genlmsg_reply(msg, info);
745
746 out_free:
747 nlmsg_free(msg);
748 out_putdev:
749 nfc_put_device(dev);
750 return rc;
751 }
752
nfc_genl_dev_up(struct sk_buff * skb,struct genl_info * info)753 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
754 {
755 struct nfc_dev *dev;
756 int rc;
757 u32 idx;
758
759 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
760 return -EINVAL;
761
762 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
763
764 dev = nfc_get_device(idx);
765 if (!dev)
766 return -ENODEV;
767
768 rc = nfc_dev_up(dev);
769
770 nfc_put_device(dev);
771 return rc;
772 }
773
nfc_genl_dev_down(struct sk_buff * skb,struct genl_info * info)774 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
775 {
776 struct nfc_dev *dev;
777 int rc;
778 u32 idx;
779
780 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
781 return -EINVAL;
782
783 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
784
785 dev = nfc_get_device(idx);
786 if (!dev)
787 return -ENODEV;
788
789 rc = nfc_dev_down(dev);
790
791 nfc_put_device(dev);
792 return rc;
793 }
794
nfc_genl_start_poll(struct sk_buff * skb,struct genl_info * info)795 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
796 {
797 struct nfc_dev *dev;
798 int rc;
799 u32 idx;
800 u32 im_protocols = 0, tm_protocols = 0;
801
802 pr_debug("Poll start\n");
803
804 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
805 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
806 !info->attrs[NFC_ATTR_PROTOCOLS]) &&
807 !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
808 return -EINVAL;
809
810 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
811
812 if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
813 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
814
815 if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
816 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
817 else if (info->attrs[NFC_ATTR_PROTOCOLS])
818 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
819
820 dev = nfc_get_device(idx);
821 if (!dev)
822 return -ENODEV;
823
824 mutex_lock(&dev->genl_data.genl_data_mutex);
825
826 rc = nfc_start_poll(dev, im_protocols, tm_protocols);
827 if (!rc)
828 dev->genl_data.poll_req_portid = info->snd_portid;
829
830 mutex_unlock(&dev->genl_data.genl_data_mutex);
831
832 nfc_put_device(dev);
833 return rc;
834 }
835
nfc_genl_stop_poll(struct sk_buff * skb,struct genl_info * info)836 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
837 {
838 struct nfc_dev *dev;
839 int rc;
840 u32 idx;
841
842 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
843 return -EINVAL;
844
845 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
846
847 dev = nfc_get_device(idx);
848 if (!dev)
849 return -ENODEV;
850
851 device_lock(&dev->dev);
852
853 if (!dev->polling) {
854 device_unlock(&dev->dev);
855 nfc_put_device(dev);
856 return -EINVAL;
857 }
858
859 device_unlock(&dev->dev);
860
861 mutex_lock(&dev->genl_data.genl_data_mutex);
862
863 if (dev->genl_data.poll_req_portid != info->snd_portid) {
864 rc = -EBUSY;
865 goto out;
866 }
867
868 rc = nfc_stop_poll(dev);
869 dev->genl_data.poll_req_portid = 0;
870
871 out:
872 mutex_unlock(&dev->genl_data.genl_data_mutex);
873 nfc_put_device(dev);
874 return rc;
875 }
876
nfc_genl_activate_target(struct sk_buff * skb,struct genl_info * info)877 static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
878 {
879 struct nfc_dev *dev;
880 u32 device_idx, target_idx, protocol;
881 int rc;
882
883 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
884 !info->attrs[NFC_ATTR_TARGET_INDEX] ||
885 !info->attrs[NFC_ATTR_PROTOCOLS])
886 return -EINVAL;
887
888 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
889
890 dev = nfc_get_device(device_idx);
891 if (!dev)
892 return -ENODEV;
893
894 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
895 protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
896
897 nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
898 rc = nfc_activate_target(dev, target_idx, protocol);
899
900 nfc_put_device(dev);
901 return rc;
902 }
903
nfc_genl_deactivate_target(struct sk_buff * skb,struct genl_info * info)904 static int nfc_genl_deactivate_target(struct sk_buff *skb,
905 struct genl_info *info)
906 {
907 struct nfc_dev *dev;
908 u32 device_idx, target_idx;
909 int rc;
910
911 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
912 !info->attrs[NFC_ATTR_TARGET_INDEX])
913 return -EINVAL;
914
915 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
916
917 dev = nfc_get_device(device_idx);
918 if (!dev)
919 return -ENODEV;
920
921 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
922
923 rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
924
925 nfc_put_device(dev);
926 return rc;
927 }
928
nfc_genl_dep_link_up(struct sk_buff * skb,struct genl_info * info)929 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
930 {
931 struct nfc_dev *dev;
932 int rc, tgt_idx;
933 u32 idx;
934 u8 comm;
935
936 pr_debug("DEP link up\n");
937
938 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
939 !info->attrs[NFC_ATTR_COMM_MODE])
940 return -EINVAL;
941
942 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
943 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
944 tgt_idx = NFC_TARGET_IDX_ANY;
945 else
946 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
947
948 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
949
950 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
951 return -EINVAL;
952
953 dev = nfc_get_device(idx);
954 if (!dev)
955 return -ENODEV;
956
957 rc = nfc_dep_link_up(dev, tgt_idx, comm);
958
959 nfc_put_device(dev);
960
961 return rc;
962 }
963
nfc_genl_dep_link_down(struct sk_buff * skb,struct genl_info * info)964 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
965 {
966 struct nfc_dev *dev;
967 int rc;
968 u32 idx;
969
970 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
971 !info->attrs[NFC_ATTR_TARGET_INDEX])
972 return -EINVAL;
973
974 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
975
976 dev = nfc_get_device(idx);
977 if (!dev)
978 return -ENODEV;
979
980 rc = nfc_dep_link_down(dev);
981
982 nfc_put_device(dev);
983 return rc;
984 }
985
nfc_genl_send_params(struct sk_buff * msg,struct nfc_llcp_local * local,u32 portid,u32 seq)986 static int nfc_genl_send_params(struct sk_buff *msg,
987 struct nfc_llcp_local *local,
988 u32 portid, u32 seq)
989 {
990 void *hdr;
991
992 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
993 NFC_CMD_LLC_GET_PARAMS);
994 if (!hdr)
995 return -EMSGSIZE;
996
997 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
998 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
999 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1000 nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1001 goto nla_put_failure;
1002
1003 genlmsg_end(msg, hdr);
1004 return 0;
1005
1006 nla_put_failure:
1007 genlmsg_cancel(msg, hdr);
1008 return -EMSGSIZE;
1009 }
1010
nfc_genl_llc_get_params(struct sk_buff * skb,struct genl_info * info)1011 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1012 {
1013 struct nfc_dev *dev;
1014 struct nfc_llcp_local *local;
1015 int rc = 0;
1016 struct sk_buff *msg = NULL;
1017 u32 idx;
1018
1019 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1020 !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1021 return -EINVAL;
1022
1023 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1024
1025 dev = nfc_get_device(idx);
1026 if (!dev)
1027 return -ENODEV;
1028
1029 device_lock(&dev->dev);
1030
1031 local = nfc_llcp_find_local(dev);
1032 if (!local) {
1033 rc = -ENODEV;
1034 goto exit;
1035 }
1036
1037 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1038 if (!msg) {
1039 rc = -ENOMEM;
1040 goto exit;
1041 }
1042
1043 rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1044
1045 exit:
1046 device_unlock(&dev->dev);
1047
1048 nfc_put_device(dev);
1049
1050 if (rc < 0) {
1051 if (msg)
1052 nlmsg_free(msg);
1053
1054 return rc;
1055 }
1056
1057 return genlmsg_reply(msg, info);
1058 }
1059
nfc_genl_llc_set_params(struct sk_buff * skb,struct genl_info * info)1060 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1061 {
1062 struct nfc_dev *dev;
1063 struct nfc_llcp_local *local;
1064 u8 rw = 0;
1065 u16 miux = 0;
1066 u32 idx;
1067 int rc = 0;
1068
1069 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1070 (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1071 !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1072 !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1073 return -EINVAL;
1074
1075 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1076 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1077
1078 if (rw > LLCP_MAX_RW)
1079 return -EINVAL;
1080 }
1081
1082 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1083 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1084
1085 if (miux > LLCP_MAX_MIUX)
1086 return -EINVAL;
1087 }
1088
1089 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1090
1091 dev = nfc_get_device(idx);
1092 if (!dev)
1093 return -ENODEV;
1094
1095 device_lock(&dev->dev);
1096
1097 local = nfc_llcp_find_local(dev);
1098 if (!local) {
1099 rc = -ENODEV;
1100 goto exit;
1101 }
1102
1103 if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1104 if (dev->dep_link_up) {
1105 rc = -EINPROGRESS;
1106 goto exit;
1107 }
1108
1109 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1110 }
1111
1112 if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1113 local->rw = rw;
1114
1115 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1116 local->miux = cpu_to_be16(miux);
1117
1118 exit:
1119 device_unlock(&dev->dev);
1120
1121 nfc_put_device(dev);
1122
1123 return rc;
1124 }
1125
nfc_genl_llc_sdreq(struct sk_buff * skb,struct genl_info * info)1126 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1127 {
1128 struct nfc_dev *dev;
1129 struct nfc_llcp_local *local;
1130 struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1131 u32 idx;
1132 u8 tid;
1133 char *uri;
1134 int rc = 0, rem;
1135 size_t uri_len, tlvs_len;
1136 struct hlist_head sdreq_list;
1137 struct nfc_llcp_sdp_tlv *sdreq;
1138
1139 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1140 !info->attrs[NFC_ATTR_LLC_SDP])
1141 return -EINVAL;
1142
1143 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1144
1145 dev = nfc_get_device(idx);
1146 if (!dev)
1147 return -ENODEV;
1148
1149 device_lock(&dev->dev);
1150
1151 if (dev->dep_link_up == false) {
1152 rc = -ENOLINK;
1153 goto exit;
1154 }
1155
1156 local = nfc_llcp_find_local(dev);
1157 if (!local) {
1158 rc = -ENODEV;
1159 goto exit;
1160 }
1161
1162 INIT_HLIST_HEAD(&sdreq_list);
1163
1164 tlvs_len = 0;
1165
1166 nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1167 rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX,
1168 attr, nfc_sdp_genl_policy,
1169 info->extack);
1170
1171 if (rc != 0) {
1172 rc = -EINVAL;
1173 goto exit;
1174 }
1175
1176 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1177 continue;
1178
1179 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1180 if (uri_len == 0)
1181 continue;
1182
1183 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1184 if (uri == NULL || *uri == 0)
1185 continue;
1186
1187 tid = local->sdreq_next_tid++;
1188
1189 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1190 if (sdreq == NULL) {
1191 rc = -ENOMEM;
1192 goto exit;
1193 }
1194
1195 tlvs_len += sdreq->tlv_len;
1196
1197 hlist_add_head(&sdreq->node, &sdreq_list);
1198 }
1199
1200 if (hlist_empty(&sdreq_list)) {
1201 rc = -EINVAL;
1202 goto exit;
1203 }
1204
1205 rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1206 exit:
1207 device_unlock(&dev->dev);
1208
1209 nfc_put_device(dev);
1210
1211 return rc;
1212 }
1213
nfc_genl_fw_download(struct sk_buff * skb,struct genl_info * info)1214 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1215 {
1216 struct nfc_dev *dev;
1217 int rc;
1218 u32 idx;
1219 char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1220
1221 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1222 return -EINVAL;
1223
1224 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1225
1226 dev = nfc_get_device(idx);
1227 if (!dev)
1228 return -ENODEV;
1229
1230 nla_strscpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1231 sizeof(firmware_name));
1232
1233 rc = nfc_fw_download(dev, firmware_name);
1234
1235 nfc_put_device(dev);
1236 return rc;
1237 }
1238
nfc_genl_fw_download_done(struct nfc_dev * dev,const char * firmware_name,u32 result)1239 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1240 u32 result)
1241 {
1242 struct sk_buff *msg;
1243 void *hdr;
1244
1245 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1246 if (!msg)
1247 return -ENOMEM;
1248
1249 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1250 NFC_CMD_FW_DOWNLOAD);
1251 if (!hdr)
1252 goto free_msg;
1253
1254 if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1255 nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1256 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1257 goto nla_put_failure;
1258
1259 genlmsg_end(msg, hdr);
1260
1261 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1262
1263 return 0;
1264
1265 nla_put_failure:
1266 free_msg:
1267 nlmsg_free(msg);
1268 return -EMSGSIZE;
1269 }
1270
nfc_genl_enable_se(struct sk_buff * skb,struct genl_info * info)1271 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1272 {
1273 struct nfc_dev *dev;
1274 int rc;
1275 u32 idx, se_idx;
1276
1277 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1278 !info->attrs[NFC_ATTR_SE_INDEX])
1279 return -EINVAL;
1280
1281 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1282 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1283
1284 dev = nfc_get_device(idx);
1285 if (!dev)
1286 return -ENODEV;
1287
1288 rc = nfc_enable_se(dev, se_idx);
1289
1290 nfc_put_device(dev);
1291 return rc;
1292 }
1293
nfc_genl_disable_se(struct sk_buff * skb,struct genl_info * info)1294 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1295 {
1296 struct nfc_dev *dev;
1297 int rc;
1298 u32 idx, se_idx;
1299
1300 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1301 !info->attrs[NFC_ATTR_SE_INDEX])
1302 return -EINVAL;
1303
1304 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1305 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1306
1307 dev = nfc_get_device(idx);
1308 if (!dev)
1309 return -ENODEV;
1310
1311 rc = nfc_disable_se(dev, se_idx);
1312
1313 nfc_put_device(dev);
1314 return rc;
1315 }
1316
nfc_genl_send_se(struct sk_buff * msg,struct nfc_dev * dev,u32 portid,u32 seq,struct netlink_callback * cb,int flags)1317 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1318 u32 portid, u32 seq,
1319 struct netlink_callback *cb,
1320 int flags)
1321 {
1322 void *hdr;
1323 struct nfc_se *se, *n;
1324
1325 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1326 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1327 NFC_CMD_GET_SE);
1328 if (!hdr)
1329 goto nla_put_failure;
1330
1331 if (cb)
1332 genl_dump_check_consistent(cb, hdr);
1333
1334 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1335 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1336 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1337 goto nla_put_failure;
1338
1339 genlmsg_end(msg, hdr);
1340 }
1341
1342 return 0;
1343
1344 nla_put_failure:
1345 genlmsg_cancel(msg, hdr);
1346 return -EMSGSIZE;
1347 }
1348
nfc_genl_dump_ses(struct sk_buff * skb,struct netlink_callback * cb)1349 static int nfc_genl_dump_ses(struct sk_buff *skb,
1350 struct netlink_callback *cb)
1351 {
1352 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1353 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1354 bool first_call = false;
1355
1356 if (!iter) {
1357 first_call = true;
1358 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1359 if (!iter)
1360 return -ENOMEM;
1361 cb->args[0] = (long) iter;
1362 }
1363
1364 mutex_lock(&nfc_devlist_mutex);
1365
1366 cb->seq = nfc_devlist_generation;
1367
1368 if (first_call) {
1369 nfc_device_iter_init(iter);
1370 dev = nfc_device_iter_next(iter);
1371 }
1372
1373 while (dev) {
1374 int rc;
1375
1376 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1377 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1378 if (rc < 0)
1379 break;
1380
1381 dev = nfc_device_iter_next(iter);
1382 }
1383
1384 mutex_unlock(&nfc_devlist_mutex);
1385
1386 cb->args[1] = (long) dev;
1387
1388 return skb->len;
1389 }
1390
nfc_genl_dump_ses_done(struct netlink_callback * cb)1391 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1392 {
1393 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1394
1395 nfc_device_iter_exit(iter);
1396 kfree(iter);
1397
1398 return 0;
1399 }
1400
nfc_se_io(struct nfc_dev * dev,u32 se_idx,u8 * apdu,size_t apdu_length,se_io_cb_t cb,void * cb_context)1401 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1402 u8 *apdu, size_t apdu_length,
1403 se_io_cb_t cb, void *cb_context)
1404 {
1405 struct nfc_se *se;
1406 int rc;
1407
1408 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1409
1410 device_lock(&dev->dev);
1411
1412 if (!device_is_registered(&dev->dev)) {
1413 rc = -ENODEV;
1414 goto error;
1415 }
1416
1417 if (!dev->dev_up) {
1418 rc = -ENODEV;
1419 goto error;
1420 }
1421
1422 if (!dev->ops->se_io) {
1423 rc = -EOPNOTSUPP;
1424 goto error;
1425 }
1426
1427 se = nfc_find_se(dev, se_idx);
1428 if (!se) {
1429 rc = -EINVAL;
1430 goto error;
1431 }
1432
1433 if (se->state != NFC_SE_ENABLED) {
1434 rc = -ENODEV;
1435 goto error;
1436 }
1437
1438 rc = dev->ops->se_io(dev, se_idx, apdu,
1439 apdu_length, cb, cb_context);
1440
1441 error:
1442 device_unlock(&dev->dev);
1443 return rc;
1444 }
1445
1446 struct se_io_ctx {
1447 u32 dev_idx;
1448 u32 se_idx;
1449 };
1450
se_io_cb(void * context,u8 * apdu,size_t apdu_len,int err)1451 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1452 {
1453 struct se_io_ctx *ctx = context;
1454 struct sk_buff *msg;
1455 void *hdr;
1456
1457 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1458 if (!msg) {
1459 kfree(ctx);
1460 return;
1461 }
1462
1463 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1464 NFC_CMD_SE_IO);
1465 if (!hdr)
1466 goto free_msg;
1467
1468 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1469 nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1470 nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1471 goto nla_put_failure;
1472
1473 genlmsg_end(msg, hdr);
1474
1475 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1476
1477 kfree(ctx);
1478
1479 return;
1480
1481 nla_put_failure:
1482 free_msg:
1483 nlmsg_free(msg);
1484 kfree(ctx);
1485
1486 return;
1487 }
1488
nfc_genl_se_io(struct sk_buff * skb,struct genl_info * info)1489 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1490 {
1491 struct nfc_dev *dev;
1492 struct se_io_ctx *ctx;
1493 u32 dev_idx, se_idx;
1494 u8 *apdu;
1495 size_t apdu_len;
1496
1497 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1498 !info->attrs[NFC_ATTR_SE_INDEX] ||
1499 !info->attrs[NFC_ATTR_SE_APDU])
1500 return -EINVAL;
1501
1502 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1503 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1504
1505 dev = nfc_get_device(dev_idx);
1506 if (!dev)
1507 return -ENODEV;
1508
1509 if (!dev->ops || !dev->ops->se_io)
1510 return -ENOTSUPP;
1511
1512 apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1513 if (apdu_len == 0)
1514 return -EINVAL;
1515
1516 apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1517 if (!apdu)
1518 return -EINVAL;
1519
1520 ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1521 if (!ctx)
1522 return -ENOMEM;
1523
1524 ctx->dev_idx = dev_idx;
1525 ctx->se_idx = se_idx;
1526
1527 return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1528 }
1529
nfc_genl_vendor_cmd(struct sk_buff * skb,struct genl_info * info)1530 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1531 struct genl_info *info)
1532 {
1533 struct nfc_dev *dev;
1534 const struct nfc_vendor_cmd *cmd;
1535 u32 dev_idx, vid, subcmd;
1536 u8 *data;
1537 size_t data_len;
1538 int i, err;
1539
1540 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1541 !info->attrs[NFC_ATTR_VENDOR_ID] ||
1542 !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1543 return -EINVAL;
1544
1545 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1546 vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1547 subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1548
1549 dev = nfc_get_device(dev_idx);
1550 if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
1551 return -ENODEV;
1552
1553 if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1554 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1555 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1556 if (data_len == 0)
1557 return -EINVAL;
1558 } else {
1559 data = NULL;
1560 data_len = 0;
1561 }
1562
1563 for (i = 0; i < dev->n_vendor_cmds; i++) {
1564 cmd = &dev->vendor_cmds[i];
1565
1566 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1567 continue;
1568
1569 dev->cur_cmd_info = info;
1570 err = cmd->doit(dev, data, data_len);
1571 dev->cur_cmd_info = NULL;
1572 return err;
1573 }
1574
1575 return -EOPNOTSUPP;
1576 }
1577
1578 /* message building helper */
nfc_hdr_put(struct sk_buff * skb,u32 portid,u32 seq,int flags,u8 cmd)1579 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1580 int flags, u8 cmd)
1581 {
1582 /* since there is no private header just add the generic one */
1583 return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1584 }
1585
1586 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)1587 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1588 u32 portid, u32 seq,
1589 enum nfc_attrs attr,
1590 u32 oui, u32 subcmd, gfp_t gfp)
1591 {
1592 struct sk_buff *skb;
1593 void *hdr;
1594
1595 skb = nlmsg_new(approxlen + 100, gfp);
1596 if (!skb)
1597 return NULL;
1598
1599 hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1600 if (!hdr) {
1601 kfree_skb(skb);
1602 return NULL;
1603 }
1604
1605 if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1606 goto nla_put_failure;
1607 if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1608 goto nla_put_failure;
1609 if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1610 goto nla_put_failure;
1611
1612 ((void **)skb->cb)[0] = dev;
1613 ((void **)skb->cb)[1] = hdr;
1614
1615 return skb;
1616
1617 nla_put_failure:
1618 kfree_skb(skb);
1619 return NULL;
1620 }
1621
__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev * dev,enum nfc_attrs attr,u32 oui,u32 subcmd,int approxlen)1622 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1623 enum nfc_attrs attr,
1624 u32 oui, u32 subcmd,
1625 int approxlen)
1626 {
1627 if (WARN_ON(!dev->cur_cmd_info))
1628 return NULL;
1629
1630 return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1631 dev->cur_cmd_info->snd_portid,
1632 dev->cur_cmd_info->snd_seq, attr,
1633 oui, subcmd, GFP_KERNEL);
1634 }
1635 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1636
nfc_vendor_cmd_reply(struct sk_buff * skb)1637 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1638 {
1639 struct nfc_dev *dev = ((void **)skb->cb)[0];
1640 void *hdr = ((void **)skb->cb)[1];
1641
1642 /* clear CB data for netlink core to own from now on */
1643 memset(skb->cb, 0, sizeof(skb->cb));
1644
1645 if (WARN_ON(!dev->cur_cmd_info)) {
1646 kfree_skb(skb);
1647 return -EINVAL;
1648 }
1649
1650 genlmsg_end(skb, hdr);
1651 return genlmsg_reply(skb, dev->cur_cmd_info);
1652 }
1653 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1654
1655 static const struct genl_ops nfc_genl_ops[] = {
1656 {
1657 .cmd = NFC_CMD_GET_DEVICE,
1658 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1659 .doit = nfc_genl_get_device,
1660 .dumpit = nfc_genl_dump_devices,
1661 .done = nfc_genl_dump_devices_done,
1662 },
1663 {
1664 .cmd = NFC_CMD_DEV_UP,
1665 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1666 .doit = nfc_genl_dev_up,
1667 },
1668 {
1669 .cmd = NFC_CMD_DEV_DOWN,
1670 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1671 .doit = nfc_genl_dev_down,
1672 },
1673 {
1674 .cmd = NFC_CMD_START_POLL,
1675 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1676 .doit = nfc_genl_start_poll,
1677 },
1678 {
1679 .cmd = NFC_CMD_STOP_POLL,
1680 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1681 .doit = nfc_genl_stop_poll,
1682 },
1683 {
1684 .cmd = NFC_CMD_DEP_LINK_UP,
1685 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1686 .doit = nfc_genl_dep_link_up,
1687 },
1688 {
1689 .cmd = NFC_CMD_DEP_LINK_DOWN,
1690 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1691 .doit = nfc_genl_dep_link_down,
1692 },
1693 {
1694 .cmd = NFC_CMD_GET_TARGET,
1695 .validate = GENL_DONT_VALIDATE_STRICT |
1696 GENL_DONT_VALIDATE_DUMP_STRICT,
1697 .dumpit = nfc_genl_dump_targets,
1698 .done = nfc_genl_dump_targets_done,
1699 },
1700 {
1701 .cmd = NFC_CMD_LLC_GET_PARAMS,
1702 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1703 .doit = nfc_genl_llc_get_params,
1704 },
1705 {
1706 .cmd = NFC_CMD_LLC_SET_PARAMS,
1707 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1708 .doit = nfc_genl_llc_set_params,
1709 },
1710 {
1711 .cmd = NFC_CMD_LLC_SDREQ,
1712 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1713 .doit = nfc_genl_llc_sdreq,
1714 },
1715 {
1716 .cmd = NFC_CMD_FW_DOWNLOAD,
1717 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1718 .doit = nfc_genl_fw_download,
1719 },
1720 {
1721 .cmd = NFC_CMD_ENABLE_SE,
1722 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1723 .doit = nfc_genl_enable_se,
1724 },
1725 {
1726 .cmd = NFC_CMD_DISABLE_SE,
1727 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1728 .doit = nfc_genl_disable_se,
1729 },
1730 {
1731 .cmd = NFC_CMD_GET_SE,
1732 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1733 .dumpit = nfc_genl_dump_ses,
1734 .done = nfc_genl_dump_ses_done,
1735 },
1736 {
1737 .cmd = NFC_CMD_SE_IO,
1738 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1739 .doit = nfc_genl_se_io,
1740 },
1741 {
1742 .cmd = NFC_CMD_ACTIVATE_TARGET,
1743 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1744 .doit = nfc_genl_activate_target,
1745 },
1746 {
1747 .cmd = NFC_CMD_VENDOR,
1748 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1749 .doit = nfc_genl_vendor_cmd,
1750 },
1751 {
1752 .cmd = NFC_CMD_DEACTIVATE_TARGET,
1753 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1754 .doit = nfc_genl_deactivate_target,
1755 },
1756 };
1757
1758 static struct genl_family nfc_genl_family __ro_after_init = {
1759 .hdrsize = 0,
1760 .name = NFC_GENL_NAME,
1761 .version = NFC_GENL_VERSION,
1762 .maxattr = NFC_ATTR_MAX,
1763 .policy = nfc_genl_policy,
1764 .module = THIS_MODULE,
1765 .ops = nfc_genl_ops,
1766 .n_ops = ARRAY_SIZE(nfc_genl_ops),
1767 .mcgrps = nfc_genl_mcgrps,
1768 .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1769 };
1770
1771
1772 struct urelease_work {
1773 struct work_struct w;
1774 u32 portid;
1775 };
1776
nfc_urelease_event_work(struct work_struct * work)1777 static void nfc_urelease_event_work(struct work_struct *work)
1778 {
1779 struct urelease_work *w = container_of(work, struct urelease_work, w);
1780 struct class_dev_iter iter;
1781 struct nfc_dev *dev;
1782
1783 pr_debug("portid %d\n", w->portid);
1784
1785 mutex_lock(&nfc_devlist_mutex);
1786
1787 nfc_device_iter_init(&iter);
1788 dev = nfc_device_iter_next(&iter);
1789
1790 while (dev) {
1791 mutex_lock(&dev->genl_data.genl_data_mutex);
1792
1793 if (dev->genl_data.poll_req_portid == w->portid) {
1794 nfc_stop_poll(dev);
1795 dev->genl_data.poll_req_portid = 0;
1796 }
1797
1798 mutex_unlock(&dev->genl_data.genl_data_mutex);
1799
1800 dev = nfc_device_iter_next(&iter);
1801 }
1802
1803 nfc_device_iter_exit(&iter);
1804
1805 mutex_unlock(&nfc_devlist_mutex);
1806
1807 kfree(w);
1808 }
1809
nfc_genl_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)1810 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1811 unsigned long event, void *ptr)
1812 {
1813 struct netlink_notify *n = ptr;
1814 struct urelease_work *w;
1815
1816 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1817 goto out;
1818
1819 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1820
1821 w = kmalloc(sizeof(*w), GFP_ATOMIC);
1822 if (w) {
1823 INIT_WORK(&w->w, nfc_urelease_event_work);
1824 w->portid = n->portid;
1825 schedule_work(&w->w);
1826 }
1827
1828 out:
1829 return NOTIFY_DONE;
1830 }
1831
nfc_genl_data_init(struct nfc_genl_data * genl_data)1832 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1833 {
1834 genl_data->poll_req_portid = 0;
1835 mutex_init(&genl_data->genl_data_mutex);
1836 }
1837
nfc_genl_data_exit(struct nfc_genl_data * genl_data)1838 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1839 {
1840 mutex_destroy(&genl_data->genl_data_mutex);
1841 }
1842
1843 static struct notifier_block nl_notifier = {
1844 .notifier_call = nfc_genl_rcv_nl_event,
1845 };
1846
1847 /**
1848 * nfc_genl_init() - Initialize netlink interface
1849 *
1850 * This initialization function registers the nfc netlink family.
1851 */
nfc_genl_init(void)1852 int __init nfc_genl_init(void)
1853 {
1854 int rc;
1855
1856 rc = genl_register_family(&nfc_genl_family);
1857 if (rc)
1858 return rc;
1859
1860 netlink_register_notifier(&nl_notifier);
1861
1862 return 0;
1863 }
1864
1865 /**
1866 * nfc_genl_exit() - Deinitialize netlink interface
1867 *
1868 * This exit function unregisters the nfc netlink family.
1869 */
nfc_genl_exit(void)1870 void nfc_genl_exit(void)
1871 {
1872 netlink_unregister_notifier(&nl_notifier);
1873 genl_unregister_family(&nfc_genl_family);
1874 }
1875
