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 }