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Linux/net/nfc/netlink.c

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

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