tcp: cubic: fix overflow error in bictcp_update()
[linux-3.10.git] / net / nfc / netlink.c
1 /*
2  * Copyright (C) 2011 Instituto Nokia de Tecnologia
3  *
4  * Authors:
5  *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
6  *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the
20  * Free Software Foundation, Inc.,
21  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22  */
23
24 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
25
26 #include <net/genetlink.h>
27 #include <linux/nfc.h>
28 #include <linux/slab.h>
29
30 #include "nfc.h"
31 #include "llcp.h"
32
33 static struct genl_multicast_group nfc_genl_event_mcgrp = {
34         .name = NFC_GENL_MCAST_EVENT_NAME,
35 };
36
37 static struct genl_family nfc_genl_family = {
38         .id = GENL_ID_GENERATE,
39         .hdrsize = 0,
40         .name = NFC_GENL_NAME,
41         .version = NFC_GENL_VERSION,
42         .maxattr = NFC_ATTR_MAX,
43 };
44
45 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
46         [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
47         [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
48                                 .len = NFC_DEVICE_NAME_MAXSIZE },
49         [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
50         [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
51         [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
52         [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
53         [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
54         [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
55         [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
56         [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
57         [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
58         [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
59 };
60
61 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
62         [NFC_SDP_ATTR_URI] = { .type = NLA_STRING },
63         [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
64 };
65
66 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
67                                 struct netlink_callback *cb, int flags)
68 {
69         void *hdr;
70
71         hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
72                           &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
73         if (!hdr)
74                 return -EMSGSIZE;
75
76         genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
77
78         if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
79             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
80             nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
81             nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
82                 goto nla_put_failure;
83         if (target->nfcid1_len > 0 &&
84             nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
85                     target->nfcid1))
86                 goto nla_put_failure;
87         if (target->sensb_res_len > 0 &&
88             nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
89                     target->sensb_res))
90                 goto nla_put_failure;
91         if (target->sensf_res_len > 0 &&
92             nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
93                     target->sensf_res))
94                 goto nla_put_failure;
95
96         return genlmsg_end(msg, hdr);
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 nfc_dev *dev;
106         int rc;
107         u32 idx;
108
109         rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
110                          nfc_genl_family.attrbuf,
111                          nfc_genl_family.maxattr,
112                          nfc_genl_policy);
113         if (rc < 0)
114                 return ERR_PTR(rc);
115
116         if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
117                 return ERR_PTR(-EINVAL);
118
119         idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
120
121         dev = nfc_get_device(idx);
122         if (!dev)
123                 return ERR_PTR(-ENODEV);
124
125         return dev;
126 }
127
128 static int nfc_genl_dump_targets(struct sk_buff *skb,
129                                  struct netlink_callback *cb)
130 {
131         int i = cb->args[0];
132         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
133         int rc;
134
135         if (!dev) {
136                 dev = __get_device_from_cb(cb);
137                 if (IS_ERR(dev))
138                         return PTR_ERR(dev);
139
140                 cb->args[1] = (long) dev;
141         }
142
143         device_lock(&dev->dev);
144
145         cb->seq = dev->targets_generation;
146
147         while (i < dev->n_targets) {
148                 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
149                                           NLM_F_MULTI);
150                 if (rc < 0)
151                         break;
152
153                 i++;
154         }
155
156         device_unlock(&dev->dev);
157
158         cb->args[0] = i;
159
160         return skb->len;
161 }
162
163 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
164 {
165         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
166
167         if (dev)
168                 nfc_put_device(dev);
169
170         return 0;
171 }
172
173 int nfc_genl_targets_found(struct nfc_dev *dev)
174 {
175         struct sk_buff *msg;
176         void *hdr;
177
178         dev->genl_data.poll_req_portid = 0;
179
180         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
181         if (!msg)
182                 return -ENOMEM;
183
184         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
185                           NFC_EVENT_TARGETS_FOUND);
186         if (!hdr)
187                 goto free_msg;
188
189         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
190                 goto nla_put_failure;
191
192         genlmsg_end(msg, hdr);
193
194         return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
195
196 nla_put_failure:
197         genlmsg_cancel(msg, hdr);
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(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
224
225         return 0;
226
227 nla_put_failure:
228         genlmsg_cancel(msg, hdr);
229 free_msg:
230         nlmsg_free(msg);
231         return -EMSGSIZE;
232 }
233
234 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
235 {
236         struct sk_buff *msg;
237         void *hdr;
238
239         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
240         if (!msg)
241                 return -ENOMEM;
242
243         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
244                           NFC_EVENT_TM_ACTIVATED);
245         if (!hdr)
246                 goto free_msg;
247
248         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
249                 goto nla_put_failure;
250         if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
251                 goto nla_put_failure;
252
253         genlmsg_end(msg, hdr);
254
255         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
256
257         return 0;
258
259 nla_put_failure:
260         genlmsg_cancel(msg, hdr);
261 free_msg:
262         nlmsg_free(msg);
263         return -EMSGSIZE;
264 }
265
266 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
267 {
268         struct sk_buff *msg;
269         void *hdr;
270
271         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
272         if (!msg)
273                 return -ENOMEM;
274
275         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
276                           NFC_EVENT_TM_DEACTIVATED);
277         if (!hdr)
278                 goto free_msg;
279
280         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
281                 goto nla_put_failure;
282
283         genlmsg_end(msg, hdr);
284
285         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
286
287         return 0;
288
289 nla_put_failure:
290         genlmsg_cancel(msg, hdr);
291 free_msg:
292         nlmsg_free(msg);
293         return -EMSGSIZE;
294 }
295
296 int nfc_genl_device_added(struct nfc_dev *dev)
297 {
298         struct sk_buff *msg;
299         void *hdr;
300
301         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
302         if (!msg)
303                 return -ENOMEM;
304
305         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
306                           NFC_EVENT_DEVICE_ADDED);
307         if (!hdr)
308                 goto free_msg;
309
310         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
311             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
312             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
313             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
314                 goto nla_put_failure;
315
316         genlmsg_end(msg, hdr);
317
318         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
319
320         return 0;
321
322 nla_put_failure:
323         genlmsg_cancel(msg, hdr);
324 free_msg:
325         nlmsg_free(msg);
326         return -EMSGSIZE;
327 }
328
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(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
349
350         return 0;
351
352 nla_put_failure:
353         genlmsg_cancel(msg, hdr);
354 free_msg:
355         nlmsg_free(msg);
356         return -EMSGSIZE;
357 }
358
359 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
360 {
361         struct sk_buff *msg;
362         struct nlattr *sdp_attr, *uri_attr;
363         struct nfc_llcp_sdp_tlv *sdres;
364         struct hlist_node *n;
365         void *hdr;
366         int rc = -EMSGSIZE;
367         int i;
368
369         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
370         if (!msg)
371                 return -ENOMEM;
372
373         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
374                           NFC_EVENT_LLC_SDRES);
375         if (!hdr)
376                 goto free_msg;
377
378         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
379                 goto nla_put_failure;
380
381         sdp_attr = nla_nest_start(msg, NFC_ATTR_LLC_SDP);
382         if (sdp_attr == NULL) {
383                 rc = -ENOMEM;
384                 goto nla_put_failure;
385         }
386
387         i = 1;
388         hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
389                 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
390
391                 uri_attr = nla_nest_start(msg, i++);
392                 if (uri_attr == NULL) {
393                         rc = -ENOMEM;
394                         goto nla_put_failure;
395                 }
396
397                 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
398                         goto nla_put_failure;
399
400                 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
401                         goto nla_put_failure;
402
403                 nla_nest_end(msg, uri_attr);
404
405                 hlist_del(&sdres->node);
406
407                 nfc_llcp_free_sdp_tlv(sdres);
408         }
409
410         nla_nest_end(msg, sdp_attr);
411
412         genlmsg_end(msg, hdr);
413
414         return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
415
416 nla_put_failure:
417         genlmsg_cancel(msg, hdr);
418
419 free_msg:
420         nlmsg_free(msg);
421
422         nfc_llcp_free_sdp_tlv_list(sdres_list);
423
424         return rc;
425 }
426
427 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
428                                 u32 portid, u32 seq,
429                                 struct netlink_callback *cb,
430                                 int flags)
431 {
432         void *hdr;
433
434         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
435                           NFC_CMD_GET_DEVICE);
436         if (!hdr)
437                 return -EMSGSIZE;
438
439         if (cb)
440                 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
441
442         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
443             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
444             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
445             nla_put_u32(msg, NFC_ATTR_SE, dev->supported_se) ||
446             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
447             nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
448                 goto nla_put_failure;
449
450         return genlmsg_end(msg, hdr);
451
452 nla_put_failure:
453         genlmsg_cancel(msg, hdr);
454         return -EMSGSIZE;
455 }
456
457 static int nfc_genl_dump_devices(struct sk_buff *skb,
458                                  struct netlink_callback *cb)
459 {
460         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
461         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
462         bool first_call = false;
463
464         if (!iter) {
465                 first_call = true;
466                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
467                 if (!iter)
468                         return -ENOMEM;
469                 cb->args[0] = (long) iter;
470         }
471
472         mutex_lock(&nfc_devlist_mutex);
473
474         cb->seq = nfc_devlist_generation;
475
476         if (first_call) {
477                 nfc_device_iter_init(iter);
478                 dev = nfc_device_iter_next(iter);
479         }
480
481         while (dev) {
482                 int rc;
483
484                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
485                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
486                 if (rc < 0)
487                         break;
488
489                 dev = nfc_device_iter_next(iter);
490         }
491
492         mutex_unlock(&nfc_devlist_mutex);
493
494         cb->args[1] = (long) dev;
495
496         return skb->len;
497 }
498
499 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
500 {
501         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
502
503         nfc_device_iter_exit(iter);
504         kfree(iter);
505
506         return 0;
507 }
508
509 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
510                                u8 comm_mode, u8 rf_mode)
511 {
512         struct sk_buff *msg;
513         void *hdr;
514
515         pr_debug("DEP link is up\n");
516
517         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
518         if (!msg)
519                 return -ENOMEM;
520
521         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
522         if (!hdr)
523                 goto free_msg;
524
525         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
526                 goto nla_put_failure;
527         if (rf_mode == NFC_RF_INITIATOR &&
528             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
529                 goto nla_put_failure;
530         if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
531             nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
532                 goto nla_put_failure;
533
534         genlmsg_end(msg, hdr);
535
536         dev->dep_link_up = true;
537
538         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
539
540         return 0;
541
542 nla_put_failure:
543         genlmsg_cancel(msg, hdr);
544 free_msg:
545         nlmsg_free(msg);
546         return -EMSGSIZE;
547 }
548
549 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
550 {
551         struct sk_buff *msg;
552         void *hdr;
553
554         pr_debug("DEP link is down\n");
555
556         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
557         if (!msg)
558                 return -ENOMEM;
559
560         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
561                           NFC_CMD_DEP_LINK_DOWN);
562         if (!hdr)
563                 goto free_msg;
564
565         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
566                 goto nla_put_failure;
567
568         genlmsg_end(msg, hdr);
569
570         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
571
572         return 0;
573
574 nla_put_failure:
575         genlmsg_cancel(msg, hdr);
576 free_msg:
577         nlmsg_free(msg);
578         return -EMSGSIZE;
579 }
580
581 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
582 {
583         struct sk_buff *msg;
584         struct nfc_dev *dev;
585         u32 idx;
586         int rc = -ENOBUFS;
587
588         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
589                 return -EINVAL;
590
591         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
592
593         dev = nfc_get_device(idx);
594         if (!dev)
595                 return -ENODEV;
596
597         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
598         if (!msg) {
599                 rc = -ENOMEM;
600                 goto out_putdev;
601         }
602
603         rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
604                                   NULL, 0);
605         if (rc < 0)
606                 goto out_free;
607
608         nfc_put_device(dev);
609
610         return genlmsg_reply(msg, info);
611
612 out_free:
613         nlmsg_free(msg);
614 out_putdev:
615         nfc_put_device(dev);
616         return rc;
617 }
618
619 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
620 {
621         struct nfc_dev *dev;
622         int rc;
623         u32 idx;
624
625         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
626                 return -EINVAL;
627
628         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
629
630         dev = nfc_get_device(idx);
631         if (!dev)
632                 return -ENODEV;
633
634         rc = nfc_dev_up(dev);
635
636         nfc_put_device(dev);
637         return rc;
638 }
639
640 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
641 {
642         struct nfc_dev *dev;
643         int rc;
644         u32 idx;
645
646         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
647                 return -EINVAL;
648
649         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
650
651         dev = nfc_get_device(idx);
652         if (!dev)
653                 return -ENODEV;
654
655         rc = nfc_dev_down(dev);
656
657         nfc_put_device(dev);
658         return rc;
659 }
660
661 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
662 {
663         struct nfc_dev *dev;
664         int rc;
665         u32 idx;
666         u32 im_protocols = 0, tm_protocols = 0;
667
668         pr_debug("Poll start\n");
669
670         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
671             ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
672               !info->attrs[NFC_ATTR_PROTOCOLS]) &&
673               !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
674                 return -EINVAL;
675
676         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
677
678         if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
679                 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
680
681         if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
682                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
683         else if (info->attrs[NFC_ATTR_PROTOCOLS])
684                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
685
686         dev = nfc_get_device(idx);
687         if (!dev)
688                 return -ENODEV;
689
690         mutex_lock(&dev->genl_data.genl_data_mutex);
691
692         rc = nfc_start_poll(dev, im_protocols, tm_protocols);
693         if (!rc)
694                 dev->genl_data.poll_req_portid = info->snd_portid;
695
696         mutex_unlock(&dev->genl_data.genl_data_mutex);
697
698         nfc_put_device(dev);
699         return rc;
700 }
701
702 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
703 {
704         struct nfc_dev *dev;
705         int rc;
706         u32 idx;
707
708         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
709                 return -EINVAL;
710
711         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
712
713         dev = nfc_get_device(idx);
714         if (!dev)
715                 return -ENODEV;
716
717         device_lock(&dev->dev);
718
719         if (!dev->polling) {
720                 device_unlock(&dev->dev);
721                 return -EINVAL;
722         }
723
724         device_unlock(&dev->dev);
725
726         mutex_lock(&dev->genl_data.genl_data_mutex);
727
728         if (dev->genl_data.poll_req_portid != info->snd_portid) {
729                 rc = -EBUSY;
730                 goto out;
731         }
732
733         rc = nfc_stop_poll(dev);
734         dev->genl_data.poll_req_portid = 0;
735
736 out:
737         mutex_unlock(&dev->genl_data.genl_data_mutex);
738         nfc_put_device(dev);
739         return rc;
740 }
741
742 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
743 {
744         struct nfc_dev *dev;
745         int rc, tgt_idx;
746         u32 idx;
747         u8 comm;
748
749         pr_debug("DEP link up\n");
750
751         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
752             !info->attrs[NFC_ATTR_COMM_MODE])
753                 return -EINVAL;
754
755         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
756         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
757                 tgt_idx = NFC_TARGET_IDX_ANY;
758         else
759                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
760
761         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
762
763         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
764                 return -EINVAL;
765
766         dev = nfc_get_device(idx);
767         if (!dev)
768                 return -ENODEV;
769
770         rc = nfc_dep_link_up(dev, tgt_idx, comm);
771
772         nfc_put_device(dev);
773
774         return rc;
775 }
776
777 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
778 {
779         struct nfc_dev *dev;
780         int rc;
781         u32 idx;
782
783         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
784                 return -EINVAL;
785
786         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
787
788         dev = nfc_get_device(idx);
789         if (!dev)
790                 return -ENODEV;
791
792         rc = nfc_dep_link_down(dev);
793
794         nfc_put_device(dev);
795         return rc;
796 }
797
798 static int nfc_genl_send_params(struct sk_buff *msg,
799                                 struct nfc_llcp_local *local,
800                                 u32 portid, u32 seq)
801 {
802         void *hdr;
803
804         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
805                           NFC_CMD_LLC_GET_PARAMS);
806         if (!hdr)
807                 return -EMSGSIZE;
808
809         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
810             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
811             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
812             nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
813                 goto nla_put_failure;
814
815         return genlmsg_end(msg, hdr);
816
817 nla_put_failure:
818
819         genlmsg_cancel(msg, hdr);
820         return -EMSGSIZE;
821 }
822
823 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
824 {
825         struct nfc_dev *dev;
826         struct nfc_llcp_local *local;
827         int rc = 0;
828         struct sk_buff *msg = NULL;
829         u32 idx;
830
831         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
832                 return -EINVAL;
833
834         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
835
836         dev = nfc_get_device(idx);
837         if (!dev)
838                 return -ENODEV;
839
840         device_lock(&dev->dev);
841
842         local = nfc_llcp_find_local(dev);
843         if (!local) {
844                 rc = -ENODEV;
845                 goto exit;
846         }
847
848         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
849         if (!msg) {
850                 rc = -ENOMEM;
851                 goto exit;
852         }
853
854         rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
855
856 exit:
857         device_unlock(&dev->dev);
858
859         nfc_put_device(dev);
860
861         if (rc < 0) {
862                 if (msg)
863                         nlmsg_free(msg);
864
865                 return rc;
866         }
867
868         return genlmsg_reply(msg, info);
869 }
870
871 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
872 {
873         struct nfc_dev *dev;
874         struct nfc_llcp_local *local;
875         u8 rw = 0;
876         u16 miux = 0;
877         u32 idx;
878         int rc = 0;
879
880         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
881             (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
882              !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
883              !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
884                 return -EINVAL;
885
886         if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
887                 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
888
889                 if (rw > LLCP_MAX_RW)
890                         return -EINVAL;
891         }
892
893         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
894                 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
895
896                 if (miux > LLCP_MAX_MIUX)
897                         return -EINVAL;
898         }
899
900         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
901
902         dev = nfc_get_device(idx);
903         if (!dev)
904                 return -ENODEV;
905
906         device_lock(&dev->dev);
907
908         local = nfc_llcp_find_local(dev);
909         if (!local) {
910                 nfc_put_device(dev);
911                 rc = -ENODEV;
912                 goto exit;
913         }
914
915         if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
916                 if (dev->dep_link_up) {
917                         rc = -EINPROGRESS;
918                         goto exit;
919                 }
920
921                 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
922         }
923
924         if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
925                 local->rw = rw;
926
927         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
928                 local->miux = cpu_to_be16(miux);
929
930 exit:
931         device_unlock(&dev->dev);
932
933         nfc_put_device(dev);
934
935         return rc;
936 }
937
938 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
939 {
940         struct nfc_dev *dev;
941         struct nfc_llcp_local *local;
942         struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
943         u32 idx;
944         u8 tid;
945         char *uri;
946         int rc = 0, rem;
947         size_t uri_len, tlvs_len;
948         struct hlist_head sdreq_list;
949         struct nfc_llcp_sdp_tlv *sdreq;
950
951         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
952             !info->attrs[NFC_ATTR_LLC_SDP])
953                 return -EINVAL;
954
955         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
956
957         dev = nfc_get_device(idx);
958         if (!dev) {
959                 rc = -ENODEV;
960                 goto exit;
961         }
962
963         device_lock(&dev->dev);
964
965         if (dev->dep_link_up == false) {
966                 rc = -ENOLINK;
967                 goto exit;
968         }
969
970         local = nfc_llcp_find_local(dev);
971         if (!local) {
972                 nfc_put_device(dev);
973                 rc = -ENODEV;
974                 goto exit;
975         }
976
977         INIT_HLIST_HEAD(&sdreq_list);
978
979         tlvs_len = 0;
980
981         nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
982                 rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
983                                       nfc_sdp_genl_policy);
984
985                 if (rc != 0) {
986                         rc = -EINVAL;
987                         goto exit;
988                 }
989
990                 if (!sdp_attrs[NFC_SDP_ATTR_URI])
991                         continue;
992
993                 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
994                 if (uri_len == 0)
995                         continue;
996
997                 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
998                 if (uri == NULL || *uri == 0)
999                         continue;
1000
1001                 tid = local->sdreq_next_tid++;
1002
1003                 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1004                 if (sdreq == NULL) {
1005                         rc = -ENOMEM;
1006                         goto exit;
1007                 }
1008
1009                 tlvs_len += sdreq->tlv_len;
1010
1011                 hlist_add_head(&sdreq->node, &sdreq_list);
1012         }
1013
1014         if (hlist_empty(&sdreq_list)) {
1015                 rc = -EINVAL;
1016                 goto exit;
1017         }
1018
1019         rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1020 exit:
1021         device_unlock(&dev->dev);
1022
1023         nfc_put_device(dev);
1024
1025         return rc;
1026 }
1027
1028 static struct genl_ops nfc_genl_ops[] = {
1029         {
1030                 .cmd = NFC_CMD_GET_DEVICE,
1031                 .doit = nfc_genl_get_device,
1032                 .dumpit = nfc_genl_dump_devices,
1033                 .done = nfc_genl_dump_devices_done,
1034                 .policy = nfc_genl_policy,
1035         },
1036         {
1037                 .cmd = NFC_CMD_DEV_UP,
1038                 .doit = nfc_genl_dev_up,
1039                 .policy = nfc_genl_policy,
1040         },
1041         {
1042                 .cmd = NFC_CMD_DEV_DOWN,
1043                 .doit = nfc_genl_dev_down,
1044                 .policy = nfc_genl_policy,
1045         },
1046         {
1047                 .cmd = NFC_CMD_START_POLL,
1048                 .doit = nfc_genl_start_poll,
1049                 .policy = nfc_genl_policy,
1050         },
1051         {
1052                 .cmd = NFC_CMD_STOP_POLL,
1053                 .doit = nfc_genl_stop_poll,
1054                 .policy = nfc_genl_policy,
1055         },
1056         {
1057                 .cmd = NFC_CMD_DEP_LINK_UP,
1058                 .doit = nfc_genl_dep_link_up,
1059                 .policy = nfc_genl_policy,
1060         },
1061         {
1062                 .cmd = NFC_CMD_DEP_LINK_DOWN,
1063                 .doit = nfc_genl_dep_link_down,
1064                 .policy = nfc_genl_policy,
1065         },
1066         {
1067                 .cmd = NFC_CMD_GET_TARGET,
1068                 .dumpit = nfc_genl_dump_targets,
1069                 .done = nfc_genl_dump_targets_done,
1070                 .policy = nfc_genl_policy,
1071         },
1072         {
1073                 .cmd = NFC_CMD_LLC_GET_PARAMS,
1074                 .doit = nfc_genl_llc_get_params,
1075                 .policy = nfc_genl_policy,
1076         },
1077         {
1078                 .cmd = NFC_CMD_LLC_SET_PARAMS,
1079                 .doit = nfc_genl_llc_set_params,
1080                 .policy = nfc_genl_policy,
1081         },
1082         {
1083                 .cmd = NFC_CMD_LLC_SDREQ,
1084                 .doit = nfc_genl_llc_sdreq,
1085                 .policy = nfc_genl_policy,
1086         },
1087 };
1088
1089
1090 struct urelease_work {
1091         struct  work_struct w;
1092         int     portid;
1093 };
1094
1095 static void nfc_urelease_event_work(struct work_struct *work)
1096 {
1097         struct urelease_work *w = container_of(work, struct urelease_work, w);
1098         struct class_dev_iter iter;
1099         struct nfc_dev *dev;
1100
1101         pr_debug("portid %d\n", w->portid);
1102
1103         mutex_lock(&nfc_devlist_mutex);
1104
1105         nfc_device_iter_init(&iter);
1106         dev = nfc_device_iter_next(&iter);
1107
1108         while (dev) {
1109                 mutex_lock(&dev->genl_data.genl_data_mutex);
1110
1111                 if (dev->genl_data.poll_req_portid == w->portid) {
1112                         nfc_stop_poll(dev);
1113                         dev->genl_data.poll_req_portid = 0;
1114                 }
1115
1116                 mutex_unlock(&dev->genl_data.genl_data_mutex);
1117
1118                 dev = nfc_device_iter_next(&iter);
1119         }
1120
1121         nfc_device_iter_exit(&iter);
1122
1123         mutex_unlock(&nfc_devlist_mutex);
1124
1125         kfree(w);
1126 }
1127
1128 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1129                                  unsigned long event, void *ptr)
1130 {
1131         struct netlink_notify *n = ptr;
1132         struct urelease_work *w;
1133
1134         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1135                 goto out;
1136
1137         pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1138
1139         w = kmalloc(sizeof(*w), GFP_ATOMIC);
1140         if (w) {
1141                 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
1142                 w->portid = n->portid;
1143                 schedule_work((struct work_struct *) w);
1144         }
1145
1146 out:
1147         return NOTIFY_DONE;
1148 }
1149
1150 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1151 {
1152         genl_data->poll_req_portid = 0;
1153         mutex_init(&genl_data->genl_data_mutex);
1154 }
1155
1156 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1157 {
1158         mutex_destroy(&genl_data->genl_data_mutex);
1159 }
1160
1161 static struct notifier_block nl_notifier = {
1162         .notifier_call  = nfc_genl_rcv_nl_event,
1163 };
1164
1165 /**
1166  * nfc_genl_init() - Initialize netlink interface
1167  *
1168  * This initialization function registers the nfc netlink family.
1169  */
1170 int __init nfc_genl_init(void)
1171 {
1172         int rc;
1173
1174         rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
1175                                            ARRAY_SIZE(nfc_genl_ops));
1176         if (rc)
1177                 return rc;
1178
1179         rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
1180
1181         netlink_register_notifier(&nl_notifier);
1182
1183         return rc;
1184 }
1185
1186 /**
1187  * nfc_genl_exit() - Deinitialize netlink interface
1188  *
1189  * This exit function unregisters the nfc netlink family.
1190  */
1191 void nfc_genl_exit(void)
1192 {
1193         netlink_unregister_notifier(&nl_notifier);
1194         genl_unregister_family(&nfc_genl_family);
1195 }