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
  32 static struct genl_multicast_group nfc_genl_event_mcgrp = {
  33         .name = NFC_GENL_MCAST_EVENT_NAME,
  34 };
  35
  36 static struct genl_family nfc_genl_family = {
  37         .id = GENL_ID_GENERATE,
  38         .hdrsize = 0,
  39         .name = NFC_GENL_NAME,
  40         .version = NFC_GENL_VERSION,
  41         .maxattr = NFC_ATTR_MAX,
  42 };
  43
  44 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
  45         [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
  46         [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
  47                                 .len = NFC_DEVICE_NAME_MAXSIZE },
  48         [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
  49         [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
  50         [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
  51         [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
  52         [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
  53         [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
  54 };
  55
  56 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
  57                                 struct netlink_callback *cb, int flags)
  58 {
  59         void *hdr;
  60
  61         hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
  62                           &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
  63         if (!hdr)
  64                 return -EMSGSIZE;
  65
  66         genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
  67
  68         if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
  69             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
  70             nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
  71             nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
  72                 goto nla_put_failure;
  73         if (target->nfcid1_len > 0 &&
  74             nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
  75                     target->nfcid1))
  76                 goto nla_put_failure;
  77         if (target->sensb_res_len > 0 &&
  78             nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
  79                     target->sensb_res))
  80                 goto nla_put_failure;
  81         if (target->sensf_res_len > 0 &&
  82             nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
  83                     target->sensf_res))
  84                 goto nla_put_failure;
  85
  86         return genlmsg_end(msg, hdr);
  87
  88 nla_put_failure:
  89         genlmsg_cancel(msg, hdr);
  90         return -EMSGSIZE;
  91 }
  92
  93 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
  94 {
  95         struct nfc_dev *dev;
  96         int rc;
  97         u32 idx;
  98
  99         rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
 100                          nfc_genl_family.attrbuf,
 101                          nfc_genl_family.maxattr,
 102                          nfc_genl_policy);
 103         if (rc < 0)
 104                 return ERR_PTR(rc);
 105
 106         if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
 107                 return ERR_PTR(-EINVAL);
 108
 109         idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
 110
 111         dev = nfc_get_device(idx);
 112         if (!dev)
 113                 return ERR_PTR(-ENODEV);
 114
 115         return dev;
 116 }
 117
 118 static int nfc_genl_dump_targets(struct sk_buff *skb,
 119                                  struct netlink_callback *cb)
 120 {
 121         int i = cb->args[0];
 122         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 123         int rc;
 124
 125         if (!dev) {
 126                 dev = __get_device_from_cb(cb);
 127                 if (IS_ERR(dev))
 128                         return PTR_ERR(dev);
 129
 130                 cb->args[1] = (long) dev;
 131         }
 132
 133         device_lock(&dev->dev);
 134
 135         cb->seq = dev->targets_generation;
 136
 137         while (i < dev->n_targets) {
 138                 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
 139                                           NLM_F_MULTI);
 140                 if (rc < 0)
 141                         break;
 142
 143                 i++;
 144         }
 145
 146         device_unlock(&dev->dev);
 147
 148         cb->args[0] = i;
 149
 150         return skb->len;
 151 }
 152
 153 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 154 {
 155         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 156
 157         if (dev)
 158                 nfc_put_device(dev);
 159
 160         return 0;
 161 }
 162
 163 int nfc_genl_targets_found(struct nfc_dev *dev)
 164 {
 165         struct sk_buff *msg;
 166         void *hdr;
 167
 168         dev->genl_data.poll_req_pid = 0;
 169
 170         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 171         if (!msg)
 172                 return -ENOMEM;
 173
 174         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 175                           NFC_EVENT_TARGETS_FOUND);
 176         if (!hdr)
 177                 goto free_msg;
 178
 179         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 180                 goto nla_put_failure;
 181
 182         genlmsg_end(msg, hdr);
 183
 184         return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 185
 186 nla_put_failure:
 187         genlmsg_cancel(msg, hdr);
 188 free_msg:
 189         nlmsg_free(msg);
 190         return -EMSGSIZE;
 191 }
 192
 193 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
 194 {
 195         struct sk_buff *msg;
 196         void *hdr;
 197
 198         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 199         if (!msg)
 200                 return -ENOMEM;
 201
 202         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 203                           NFC_EVENT_TARGET_LOST);
 204         if (!hdr)
 205                 goto free_msg;
 206
 207         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 208             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 209                 goto nla_put_failure;
 210
 211         genlmsg_end(msg, hdr);
 212
 213         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 214
 215         return 0;
 216
 217 nla_put_failure:
 218         genlmsg_cancel(msg, hdr);
 219 free_msg:
 220         nlmsg_free(msg);
 221         return -EMSGSIZE;
 222 }
 223
 224 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
 225 {
 226         struct sk_buff *msg;
 227         void *hdr;
 228
 229         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 230         if (!msg)
 231                 return -ENOMEM;
 232
 233         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 234                           NFC_EVENT_TM_ACTIVATED);
 235         if (!hdr)
 236                 goto free_msg;
 237
 238         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 239                 goto nla_put_failure;
 240         if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
 241                 goto nla_put_failure;
 242
 243         genlmsg_end(msg, hdr);
 244
 245         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 246
 247         return 0;
 248
 249 nla_put_failure:
 250         genlmsg_cancel(msg, hdr);
 251 free_msg:
 252         nlmsg_free(msg);
 253         return -EMSGSIZE;
 254 }
 255
 256 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
 257 {
 258         struct sk_buff *msg;
 259         void *hdr;
 260
 261         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 262         if (!msg)
 263                 return -ENOMEM;
 264
 265         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 266                           NFC_EVENT_TM_DEACTIVATED);
 267         if (!hdr)
 268                 goto free_msg;
 269
 270         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 271                 goto nla_put_failure;
 272
 273         genlmsg_end(msg, hdr);
 274
 275         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 276
 277         return 0;
 278
 279 nla_put_failure:
 280         genlmsg_cancel(msg, hdr);
 281 free_msg:
 282         nlmsg_free(msg);
 283         return -EMSGSIZE;
 284 }
 285
 286 int nfc_genl_device_added(struct nfc_dev *dev)
 287 {
 288         struct sk_buff *msg;
 289         void *hdr;
 290
 291         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 292         if (!msg)
 293                 return -ENOMEM;
 294
 295         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 296                           NFC_EVENT_DEVICE_ADDED);
 297         if (!hdr)
 298                 goto free_msg;
 299
 300         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 301             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 302             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 303             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
 304                 goto nla_put_failure;
 305
 306         genlmsg_end(msg, hdr);
 307
 308         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 309
 310         return 0;
 311
 312 nla_put_failure:
 313         genlmsg_cancel(msg, hdr);
 314 free_msg:
 315         nlmsg_free(msg);
 316         return -EMSGSIZE;
 317 }
 318
 319 int nfc_genl_device_removed(struct nfc_dev *dev)
 320 {
 321         struct sk_buff *msg;
 322         void *hdr;
 323
 324         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 325         if (!msg)
 326                 return -ENOMEM;
 327
 328         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 329                           NFC_EVENT_DEVICE_REMOVED);
 330         if (!hdr)
 331                 goto free_msg;
 332
 333         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 334                 goto nla_put_failure;
 335
 336         genlmsg_end(msg, hdr);
 337
 338         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 339
 340         return 0;
 341
 342 nla_put_failure:
 343         genlmsg_cancel(msg, hdr);
 344 free_msg:
 345         nlmsg_free(msg);
 346         return -EMSGSIZE;
 347 }
 348
 349 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 350                                 u32 pid, u32 seq,
 351                                 struct netlink_callback *cb,
 352                                 int flags)
 353 {
 354         void *hdr;
 355
 356         hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
 357                           NFC_CMD_GET_DEVICE);
 358         if (!hdr)
 359                 return -EMSGSIZE;
 360
 361         if (cb)
 362                 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
 363
 364         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 365             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 366             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 367             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
 368                 goto nla_put_failure;
 369
 370         return genlmsg_end(msg, hdr);
 371
 372 nla_put_failure:
 373         genlmsg_cancel(msg, hdr);
 374         return -EMSGSIZE;
 375 }
 376
 377 static int nfc_genl_dump_devices(struct sk_buff *skb,
 378                                  struct netlink_callback *cb)
 379 {
 380         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 381         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 382         bool first_call = false;
 383
 384         if (!iter) {
 385                 first_call = true;
 386                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 387                 if (!iter)
 388                         return -ENOMEM;
 389                 cb->args[0] = (long) iter;
 390         }
 391
 392         mutex_lock(&nfc_devlist_mutex);
 393
 394         cb->seq = nfc_devlist_generation;
 395
 396         if (first_call) {
 397                 nfc_device_iter_init(iter);
 398                 dev = nfc_device_iter_next(iter);
 399         }
 400
 401         while (dev) {
 402                 int rc;
 403
 404                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
 405                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
 406                 if (rc < 0)
 407                         break;
 408
 409                 dev = nfc_device_iter_next(iter);
 410         }
 411
 412         mutex_unlock(&nfc_devlist_mutex);
 413
 414         cb->args[1] = (long) dev;
 415
 416         return skb->len;
 417 }
 418
 419 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 420 {
 421         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 422
 423         nfc_device_iter_exit(iter);
 424         kfree(iter);
 425
 426         return 0;
 427 }
 428
 429 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 430                                u8 comm_mode, u8 rf_mode)
 431 {
 432         struct sk_buff *msg;
 433         void *hdr;
 434
 435         pr_debug("DEP link is up\n");
 436
 437         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 438         if (!msg)
 439                 return -ENOMEM;
 440
 441         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
 442         if (!hdr)
 443                 goto free_msg;
 444
 445         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 446                 goto nla_put_failure;
 447         if (rf_mode == NFC_RF_INITIATOR &&
 448             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 449                 goto nla_put_failure;
 450         if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
 451             nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
 452                 goto nla_put_failure;
 453
 454         genlmsg_end(msg, hdr);
 455
 456         dev->dep_link_up = true;
 457
 458         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 459
 460         return 0;
 461
 462 nla_put_failure:
 463         genlmsg_cancel(msg, hdr);
 464 free_msg:
 465         nlmsg_free(msg);
 466         return -EMSGSIZE;
 467 }
 468
 469 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 470 {
 471         struct sk_buff *msg;
 472         void *hdr;
 473
 474         pr_debug("DEP link is down\n");
 475
 476         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 477         if (!msg)
 478                 return -ENOMEM;
 479
 480         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 481                           NFC_CMD_DEP_LINK_DOWN);
 482         if (!hdr)
 483                 goto free_msg;
 484
 485         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 486                 goto nla_put_failure;
 487
 488         genlmsg_end(msg, hdr);
 489
 490         genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
 491
 492         return 0;
 493
 494 nla_put_failure:
 495         genlmsg_cancel(msg, hdr);
 496 free_msg:
 497         nlmsg_free(msg);
 498         return -EMSGSIZE;
 499 }
 500
 501 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 502 {
 503         struct sk_buff *msg;
 504         struct nfc_dev *dev;
 505         u32 idx;
 506         int rc = -ENOBUFS;
 507
 508         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 509                 return -EINVAL;
 510
 511         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 512
 513         dev = nfc_get_device(idx);
 514         if (!dev)
 515                 return -ENODEV;
 516
 517         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 518         if (!msg) {
 519                 rc = -ENOMEM;
 520                 goto out_putdev;
 521         }
 522
 523         rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
 524                                   NULL, 0);
 525         if (rc < 0)
 526                 goto out_free;
 527
 528         nfc_put_device(dev);
 529
 530         return genlmsg_reply(msg, info);
 531
 532 out_free:
 533         nlmsg_free(msg);
 534 out_putdev:
 535         nfc_put_device(dev);
 536         return rc;
 537 }
 538
 539 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 540 {
 541         struct nfc_dev *dev;
 542         int rc;
 543         u32 idx;
 544
 545         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 546                 return -EINVAL;
 547
 548         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 549
 550         dev = nfc_get_device(idx);
 551         if (!dev)
 552                 return -ENODEV;
 553
 554         rc = nfc_dev_up(dev);
 555
 556         nfc_put_device(dev);
 557         return rc;
 558 }
 559
 560 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 561 {
 562         struct nfc_dev *dev;
 563         int rc;
 564         u32 idx;
 565
 566         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 567                 return -EINVAL;
 568
 569         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 570
 571         dev = nfc_get_device(idx);
 572         if (!dev)
 573                 return -ENODEV;
 574
 575         rc = nfc_dev_down(dev);
 576
 577         nfc_put_device(dev);
 578         return rc;
 579 }
 580
 581 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 582 {
 583         struct nfc_dev *dev;
 584         int rc;
 585         u32 idx;
 586         u32 im_protocols = 0, tm_protocols = 0;
 587
 588         pr_debug("Poll start\n");
 589
 590         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 591             ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
 592               !info->attrs[NFC_ATTR_PROTOCOLS]) &&
 593              !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
 594                 return -EINVAL;
 595
 596         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 597
 598         if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
 599                 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
 600
 601         if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
 602                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
 603         else if (info->attrs[NFC_ATTR_PROTOCOLS])
 604                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 605
 606         dev = nfc_get_device(idx);
 607         if (!dev)
 608                 return -ENODEV;
 609
 610         mutex_lock(&dev->genl_data.genl_data_mutex);
 611
 612         rc = nfc_start_poll(dev, im_protocols, tm_protocols);
 613         if (!rc)
 614                 dev->genl_data.poll_req_pid = info->snd_pid;
 615
 616         mutex_unlock(&dev->genl_data.genl_data_mutex);
 617
 618         nfc_put_device(dev);
 619         return rc;
 620 }
 621
 622 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 623 {
 624         struct nfc_dev *dev;
 625         int rc;
 626         u32 idx;
 627
 628         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 629                 return -EINVAL;
 630
 631         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 632
 633         dev = nfc_get_device(idx);
 634         if (!dev)
 635                 return -ENODEV;
 636
 637         device_lock(&dev->dev);
 638
 639         if (!dev->polling) {
 640                 device_unlock(&dev->dev);
 641                 return -EINVAL;
 642         }
 643
 644         device_unlock(&dev->dev);
 645
 646         mutex_lock(&dev->genl_data.genl_data_mutex);
 647
 648         if (dev->genl_data.poll_req_pid != info->snd_pid) {
 649                 rc = -EBUSY;
 650                 goto out;
 651         }
 652
 653         rc = nfc_stop_poll(dev);
 654         dev->genl_data.poll_req_pid = 0;
 655
 656 out:
 657         mutex_unlock(&dev->genl_data.genl_data_mutex);
 658         nfc_put_device(dev);
 659         return rc;
 660 }
 661
 662 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 663 {
 664         struct nfc_dev *dev;
 665         int rc, tgt_idx;
 666         u32 idx;
 667         u8 comm;
 668
 669         pr_debug("DEP link up\n");
 670
 671         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 672             !info->attrs[NFC_ATTR_COMM_MODE])
 673                 return -EINVAL;
 674
 675         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 676         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 677                 tgt_idx = NFC_TARGET_IDX_ANY;
 678         else
 679                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 680
 681         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 682
 683         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 684                 return -EINVAL;
 685
 686         dev = nfc_get_device(idx);
 687         if (!dev)
 688                 return -ENODEV;
 689
 690         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 691
 692         nfc_put_device(dev);
 693
 694         return rc;
 695 }
 696
 697 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 698 {
 699         struct nfc_dev *dev;
 700         int rc;
 701         u32 idx;
 702
 703         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 704                 return -EINVAL;
 705
 706         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 707
 708         dev = nfc_get_device(idx);
 709         if (!dev)
 710                 return -ENODEV;
 711
 712         rc = nfc_dep_link_down(dev);
 713
 714         nfc_put_device(dev);
 715         return rc;
 716 }
 717
 718 static struct genl_ops nfc_genl_ops[] = {
 719         {
 720                 .cmd = NFC_CMD_GET_DEVICE,
 721                 .doit = nfc_genl_get_device,
 722                 .dumpit = nfc_genl_dump_devices,
 723                 .done = nfc_genl_dump_devices_done,
 724                 .policy = nfc_genl_policy,
 725         },
 726         {
 727                 .cmd = NFC_CMD_DEV_UP,
 728                 .doit = nfc_genl_dev_up,
 729                 .policy = nfc_genl_policy,
 730         },
 731         {
 732                 .cmd = NFC_CMD_DEV_DOWN,
 733                 .doit = nfc_genl_dev_down,
 734                 .policy = nfc_genl_policy,
 735         },
 736         {
 737                 .cmd = NFC_CMD_START_POLL,
 738                 .doit = nfc_genl_start_poll,
 739                 .policy = nfc_genl_policy,
 740         },
 741         {
 742                 .cmd = NFC_CMD_STOP_POLL,
 743                 .doit = nfc_genl_stop_poll,
 744                 .policy = nfc_genl_policy,
 745         },
 746         {
 747                 .cmd = NFC_CMD_DEP_LINK_UP,
 748                 .doit = nfc_genl_dep_link_up,
 749                 .policy = nfc_genl_policy,
 750         },
 751         {
 752                 .cmd = NFC_CMD_DEP_LINK_DOWN,
 753                 .doit = nfc_genl_dep_link_down,
 754                 .policy = nfc_genl_policy,
 755         },
 756         {
 757                 .cmd = NFC_CMD_GET_TARGET,
 758                 .dumpit = nfc_genl_dump_targets,
 759                 .done = nfc_genl_dump_targets_done,
 760                 .policy = nfc_genl_policy,
 761         },
 762 };
 763
 764
 765 struct urelease_work {
 766         struct  work_struct w;
 767         int     pid;
 768 };
 769
 770 static void nfc_urelease_event_work(struct work_struct *work)
 771 {
 772         struct urelease_work *w = container_of(work, struct urelease_work, w);
 773         struct class_dev_iter iter;
 774         struct nfc_dev *dev;
 775
 776         pr_debug("pid %d\n", w->pid);
 777
 778         mutex_lock(&nfc_devlist_mutex);
 779
 780         nfc_device_iter_init(&iter);
 781         dev = nfc_device_iter_next(&iter);
 782
 783         while (dev) {
 784                 mutex_lock(&dev->genl_data.genl_data_mutex);
 785
 786                 if (dev->genl_data.poll_req_pid == w->pid) {
 787                         nfc_stop_poll(dev);
 788                         dev->genl_data.poll_req_pid = 0;
 789                 }
 790
 791                 mutex_unlock(&dev->genl_data.genl_data_mutex);
 792
 793                 dev = nfc_device_iter_next(&iter);
 794         }
 795
 796         nfc_device_iter_exit(&iter);
 797
 798         mutex_unlock(&nfc_devlist_mutex);
 799
 800         kfree(w);
 801 }
 802
 803 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
 804                                  unsigned long event, void *ptr)
 805 {
 806         struct netlink_notify *n = ptr;
 807         struct urelease_work *w;
 808
 809         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
 810                 goto out;
 811
 812         pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
 813
 814         w = kmalloc(sizeof(*w), GFP_ATOMIC);
 815         if (w) {
 816                 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
 817                 w->pid = n->pid;
 818                 schedule_work((struct work_struct *) w);
 819         }
 820
 821 out:
 822         return NOTIFY_DONE;
 823 }
 824
 825 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
 826 {
 827         genl_data->poll_req_pid = 0;
 828         mutex_init(&genl_data->genl_data_mutex);
 829 }
 830
 831 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
 832 {
 833         mutex_destroy(&genl_data->genl_data_mutex);
 834 }
 835
 836 static struct notifier_block nl_notifier = {
 837         .notifier_call  = nfc_genl_rcv_nl_event,
 838 };
 839
 840 /**
 841  * nfc_genl_init() - Initialize netlink interface
 842  *
 843  * This initialization function registers the nfc netlink family.
 844  */
 845 int __init nfc_genl_init(void)
 846 {
 847         int rc;
 848
 849         rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
 850                                            ARRAY_SIZE(nfc_genl_ops));
 851         if (rc)
 852                 return rc;
 853
 854         rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
 855
 856         netlink_register_notifier(&nl_notifier);
 857
 858         return rc;
 859 }
 860
 861 /**
 862  * nfc_genl_exit() - Deinitialize netlink interface
 863  *
 864  * This exit function unregisters the nfc netlink family.
 865  */
 866 void nfc_genl_exit(void)
 867 {
 868         netlink_unregister_notifier(&nl_notifier);
 869         genl_unregister_family(&nfc_genl_family);
 870 }