net/nfc/netlink.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   4  *
   5  * Authors:
   6  *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
   7  *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
   8  *
   9  * Vendor commands implementation based on net/wireless/nl80211.c
  10  * which is:
  11  *
  12  * Copyright 2006-2010  Johannes Berg <johannes@sipsolutions.net>
  13  * Copyright 2013-2014  Intel Mobile Communications GmbH
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  17
  18 #include <net/genetlink.h>
  19 #include <linux/nfc.h>
  20 #include <linux/slab.h>
  21
  22 #include "nfc.h"
  23 #include "llcp.h"
  24
  25 static const struct genl_multicast_group nfc_genl_mcgrps[] = {
  26         { .name = NFC_GENL_MCAST_EVENT_NAME, },
  27 };
  28
  29 static struct genl_family nfc_genl_family;
  30 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
  31         [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
  32         [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
  33                                 .len = NFC_DEVICE_NAME_MAXSIZE },
  34         [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
  35         [NFC_ATTR_TARGET_INDEX] = { .type = NLA_U32 },
  36         [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
  37         [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
  38         [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
  39         [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
  40         [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
  41         [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
  42         [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
  43         [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
  44         [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
  45         [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
  46                                      .len = NFC_FIRMWARE_NAME_MAXSIZE },
  47         [NFC_ATTR_SE_INDEX] = { .type = NLA_U32 },
  48         [NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
  49         [NFC_ATTR_VENDOR_ID] = { .type = NLA_U32 },
  50         [NFC_ATTR_VENDOR_SUBCMD] = { .type = NLA_U32 },
  51         [NFC_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
  52
  53 };
  54
  55 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
  56         [NFC_SDP_ATTR_URI] = { .type = NLA_STRING,
  57                                .len = U8_MAX - 4 },
  58         [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
  59 };
  60
  61 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
  62                                 struct netlink_callback *cb, int flags)
  63 {
  64         void *hdr;
  65
  66         hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  67                           &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
  68         if (!hdr)
  69                 return -EMSGSIZE;
  70
  71         genl_dump_check_consistent(cb, hdr);
  72
  73         if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
  74             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
  75             nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
  76             nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
  77                 goto nla_put_failure;
  78         if (target->nfcid1_len > 0 &&
  79             nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
  80                     target->nfcid1))
  81                 goto nla_put_failure;
  82         if (target->sensb_res_len > 0 &&
  83             nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
  84                     target->sensb_res))
  85                 goto nla_put_failure;
  86         if (target->sensf_res_len > 0 &&
  87             nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
  88                     target->sensf_res))
  89                 goto nla_put_failure;
  90
  91         if (target->is_iso15693) {
  92                 if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID,
  93                                target->iso15693_dsfid) ||
  94                     nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID,
  95                             sizeof(target->iso15693_uid), target->iso15693_uid))
  96                         goto nla_put_failure;
  97         }
  98
  99         genlmsg_end(msg, hdr);
 100         return 0;
 101
 102 nla_put_failure:
 103         genlmsg_cancel(msg, hdr);
 104         return -EMSGSIZE;
 105 }
 106
 107 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
 108 {
 109         const struct genl_dumpit_info *info = genl_dumpit_info(cb);
 110         struct nfc_dev *dev;
 111         u32 idx;
 112
 113         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 114                 return ERR_PTR(-EINVAL);
 115
 116         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 117
 118         dev = nfc_get_device(idx);
 119         if (!dev)
 120                 return ERR_PTR(-ENODEV);
 121
 122         return dev;
 123 }
 124
 125 static int nfc_genl_dump_targets(struct sk_buff *skb,
 126                                  struct netlink_callback *cb)
 127 {
 128         int i = cb->args[0];
 129         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 130         int rc;
 131
 132         if (!dev) {
 133                 dev = __get_device_from_cb(cb);
 134                 if (IS_ERR(dev))
 135                         return PTR_ERR(dev);
 136
 137                 cb->args[1] = (long) dev;
 138         }
 139
 140         device_lock(&dev->dev);
 141
 142         cb->seq = dev->targets_generation;
 143
 144         while (i < dev->n_targets) {
 145                 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
 146                                           NLM_F_MULTI);
 147                 if (rc < 0)
 148                         break;
 149
 150                 i++;
 151         }
 152
 153         device_unlock(&dev->dev);
 154
 155         cb->args[0] = i;
 156
 157         return skb->len;
 158 }
 159
 160 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 161 {
 162         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 163
 164         if (dev)
 165                 nfc_put_device(dev);
 166
 167         return 0;
 168 }
 169
 170 int nfc_genl_targets_found(struct nfc_dev *dev)
 171 {
 172         struct sk_buff *msg;
 173         void *hdr;
 174
 175         dev->genl_data.poll_req_portid = 0;
 176
 177         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 178         if (!msg)
 179                 return -ENOMEM;
 180
 181         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 182                           NFC_EVENT_TARGETS_FOUND);
 183         if (!hdr)
 184                 goto free_msg;
 185
 186         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 187                 goto nla_put_failure;
 188
 189         genlmsg_end(msg, hdr);
 190
 191         return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 192
 193 nla_put_failure:
 194 free_msg:
 195         nlmsg_free(msg);
 196         return -EMSGSIZE;
 197 }
 198
 199 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
 200 {
 201         struct sk_buff *msg;
 202         void *hdr;
 203
 204         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 205         if (!msg)
 206                 return -ENOMEM;
 207
 208         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 209                           NFC_EVENT_TARGET_LOST);
 210         if (!hdr)
 211                 goto free_msg;
 212
 213         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 214             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 215                 goto nla_put_failure;
 216
 217         genlmsg_end(msg, hdr);
 218
 219         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 220
 221         return 0;
 222
 223 nla_put_failure:
 224 free_msg:
 225         nlmsg_free(msg);
 226         return -EMSGSIZE;
 227 }
 228
 229 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
 230 {
 231         struct sk_buff *msg;
 232         void *hdr;
 233
 234         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 235         if (!msg)
 236                 return -ENOMEM;
 237
 238         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 239                           NFC_EVENT_TM_ACTIVATED);
 240         if (!hdr)
 241                 goto free_msg;
 242
 243         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 244                 goto nla_put_failure;
 245         if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
 246                 goto nla_put_failure;
 247
 248         genlmsg_end(msg, hdr);
 249
 250         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 251
 252         return 0;
 253
 254 nla_put_failure:
 255 free_msg:
 256         nlmsg_free(msg);
 257         return -EMSGSIZE;
 258 }
 259
 260 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
 261 {
 262         struct sk_buff *msg;
 263         void *hdr;
 264
 265         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 266         if (!msg)
 267                 return -ENOMEM;
 268
 269         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 270                           NFC_EVENT_TM_DEACTIVATED);
 271         if (!hdr)
 272                 goto free_msg;
 273
 274         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 275                 goto nla_put_failure;
 276
 277         genlmsg_end(msg, hdr);
 278
 279         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 280
 281         return 0;
 282
 283 nla_put_failure:
 284 free_msg:
 285         nlmsg_free(msg);
 286         return -EMSGSIZE;
 287 }
 288
 289 static int nfc_genl_setup_device_added(struct nfc_dev *dev, struct sk_buff *msg)
 290 {
 291         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 292             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 293             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 294             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
 295             nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
 296                 return -1;
 297         return 0;
 298 }
 299
 300 int nfc_genl_device_added(struct nfc_dev *dev)
 301 {
 302         struct sk_buff *msg;
 303         void *hdr;
 304
 305         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 306         if (!msg)
 307                 return -ENOMEM;
 308
 309         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 310                           NFC_EVENT_DEVICE_ADDED);
 311         if (!hdr)
 312                 goto free_msg;
 313
 314         if (nfc_genl_setup_device_added(dev, msg))
 315                 goto nla_put_failure;
 316
 317         genlmsg_end(msg, hdr);
 318
 319         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 320
 321         return 0;
 322
 323 nla_put_failure:
 324 free_msg:
 325         nlmsg_free(msg);
 326         return -EMSGSIZE;
 327 }
 328
 329 int nfc_genl_device_removed(struct nfc_dev *dev)
 330 {
 331         struct sk_buff *msg;
 332         void *hdr;
 333
 334         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 335         if (!msg)
 336                 return -ENOMEM;
 337
 338         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 339                           NFC_EVENT_DEVICE_REMOVED);
 340         if (!hdr)
 341                 goto free_msg;
 342
 343         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 344                 goto nla_put_failure;
 345
 346         genlmsg_end(msg, hdr);
 347
 348         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 349
 350         return 0;
 351
 352 nla_put_failure:
 353 free_msg:
 354         nlmsg_free(msg);
 355         return -EMSGSIZE;
 356 }
 357
 358 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
 359 {
 360         struct sk_buff *msg;
 361         struct nlattr *sdp_attr, *uri_attr;
 362         struct nfc_llcp_sdp_tlv *sdres;
 363         struct hlist_node *n;
 364         void *hdr;
 365         int rc = -EMSGSIZE;
 366         int i;
 367
 368         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 369         if (!msg)
 370                 return -ENOMEM;
 371
 372         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 373                           NFC_EVENT_LLC_SDRES);
 374         if (!hdr)
 375                 goto free_msg;
 376
 377         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 378                 goto nla_put_failure;
 379
 380         sdp_attr = nla_nest_start_noflag(msg, NFC_ATTR_LLC_SDP);
 381         if (sdp_attr == NULL) {
 382                 rc = -ENOMEM;
 383                 goto nla_put_failure;
 384         }
 385
 386         i = 1;
 387         hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
 388                 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
 389
 390                 uri_attr = nla_nest_start_noflag(msg, i++);
 391                 if (uri_attr == NULL) {
 392                         rc = -ENOMEM;
 393                         goto nla_put_failure;
 394                 }
 395
 396                 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
 397                         goto nla_put_failure;
 398
 399                 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
 400                         goto nla_put_failure;
 401
 402                 nla_nest_end(msg, uri_attr);
 403
 404                 hlist_del(&sdres->node);
 405
 406                 nfc_llcp_free_sdp_tlv(sdres);
 407         }
 408
 409         nla_nest_end(msg, sdp_attr);
 410
 411         genlmsg_end(msg, hdr);
 412
 413         return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 414
 415 nla_put_failure:
 416 free_msg:
 417         nlmsg_free(msg);
 418
 419         nfc_llcp_free_sdp_tlv_list(sdres_list);
 420
 421         return rc;
 422 }
 423
 424 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
 425 {
 426         struct sk_buff *msg;
 427         void *hdr;
 428
 429         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 430         if (!msg)
 431                 return -ENOMEM;
 432
 433         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 434                           NFC_EVENT_SE_ADDED);
 435         if (!hdr)
 436                 goto free_msg;
 437
 438         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 439             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 440             nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
 441                 goto nla_put_failure;
 442
 443         genlmsg_end(msg, hdr);
 444
 445         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 446
 447         return 0;
 448
 449 nla_put_failure:
 450 free_msg:
 451         nlmsg_free(msg);
 452         return -EMSGSIZE;
 453 }
 454
 455 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
 456 {
 457         struct sk_buff *msg;
 458         void *hdr;
 459
 460         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 461         if (!msg)
 462                 return -ENOMEM;
 463
 464         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 465                           NFC_EVENT_SE_REMOVED);
 466         if (!hdr)
 467                 goto free_msg;
 468
 469         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 470             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
 471                 goto nla_put_failure;
 472
 473         genlmsg_end(msg, hdr);
 474
 475         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 476
 477         return 0;
 478
 479 nla_put_failure:
 480 free_msg:
 481         nlmsg_free(msg);
 482         return -EMSGSIZE;
 483 }
 484
 485 int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
 486                             struct nfc_evt_transaction *evt_transaction)
 487 {
 488         struct nfc_se *se;
 489         struct sk_buff *msg;
 490         void *hdr;
 491
 492         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 493         if (!msg)
 494                 return -ENOMEM;
 495
 496         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 497                           NFC_EVENT_SE_TRANSACTION);
 498         if (!hdr)
 499                 goto free_msg;
 500
 501         se = nfc_find_se(dev, se_idx);
 502         if (!se)
 503                 goto free_msg;
 504
 505         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 506             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 507             nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||
 508             nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,
 509                     evt_transaction->aid) ||
 510             nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,
 511                     evt_transaction->params))
 512                 goto nla_put_failure;
 513
 514         /* evt_transaction is no more used */
 515         devm_kfree(&dev->dev, evt_transaction);
 516
 517         genlmsg_end(msg, hdr);
 518
 519         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 520
 521         return 0;
 522
 523 nla_put_failure:
 524 free_msg:
 525         /* evt_transaction is no more used */
 526         devm_kfree(&dev->dev, evt_transaction);
 527         nlmsg_free(msg);
 528         return -EMSGSIZE;
 529 }
 530
 531 int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
 532 {
 533         const struct nfc_se *se;
 534         struct sk_buff *msg;
 535         void *hdr;
 536
 537         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 538         if (!msg)
 539                 return -ENOMEM;
 540
 541         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 542                           NFC_EVENT_SE_CONNECTIVITY);
 543         if (!hdr)
 544                 goto free_msg;
 545
 546         se = nfc_find_se(dev, se_idx);
 547         if (!se)
 548                 goto free_msg;
 549
 550         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 551             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 552             nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
 553                 goto nla_put_failure;
 554
 555         genlmsg_end(msg, hdr);
 556
 557         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 558
 559         return 0;
 560
 561 nla_put_failure:
 562 free_msg:
 563         nlmsg_free(msg);
 564         return -EMSGSIZE;
 565 }
 566
 567 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 568                                 u32 portid, u32 seq,
 569                                 struct netlink_callback *cb,
 570                                 int flags)
 571 {
 572         void *hdr;
 573
 574         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
 575                           NFC_CMD_GET_DEVICE);
 576         if (!hdr)
 577                 return -EMSGSIZE;
 578
 579         if (cb)
 580                 genl_dump_check_consistent(cb, hdr);
 581
 582         if (nfc_genl_setup_device_added(dev, msg))
 583                 goto nla_put_failure;
 584
 585         genlmsg_end(msg, hdr);
 586         return 0;
 587
 588 nla_put_failure:
 589         genlmsg_cancel(msg, hdr);
 590         return -EMSGSIZE;
 591 }
 592
 593 static int nfc_genl_dump_devices(struct sk_buff *skb,
 594                                  struct netlink_callback *cb)
 595 {
 596         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 597         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 598         bool first_call = false;
 599
 600         if (!iter) {
 601                 first_call = true;
 602                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 603                 if (!iter)
 604                         return -ENOMEM;
 605                 cb->args[0] = (long) iter;
 606         }
 607
 608         mutex_lock(&nfc_devlist_mutex);
 609
 610         cb->seq = nfc_devlist_generation;
 611
 612         if (first_call) {
 613                 nfc_device_iter_init(iter);
 614                 dev = nfc_device_iter_next(iter);
 615         }
 616
 617         while (dev) {
 618                 int rc;
 619
 620                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
 621                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
 622                 if (rc < 0)
 623                         break;
 624
 625                 dev = nfc_device_iter_next(iter);
 626         }
 627
 628         mutex_unlock(&nfc_devlist_mutex);
 629
 630         cb->args[1] = (long) dev;
 631
 632         return skb->len;
 633 }
 634
 635 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 636 {
 637         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 638
 639         if (iter) {
 640                 nfc_device_iter_exit(iter);
 641                 kfree(iter);
 642         }
 643
 644         return 0;
 645 }
 646
 647 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 648                                u8 comm_mode, u8 rf_mode)
 649 {
 650         struct sk_buff *msg;
 651         void *hdr;
 652
 653         pr_debug("DEP link is up\n");
 654
 655         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 656         if (!msg)
 657                 return -ENOMEM;
 658
 659         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
 660         if (!hdr)
 661                 goto free_msg;
 662
 663         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 664                 goto nla_put_failure;
 665         if (rf_mode == NFC_RF_INITIATOR &&
 666             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 667                 goto nla_put_failure;
 668         if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
 669             nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
 670                 goto nla_put_failure;
 671
 672         genlmsg_end(msg, hdr);
 673
 674         dev->dep_link_up = true;
 675
 676         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 677
 678         return 0;
 679
 680 nla_put_failure:
 681 free_msg:
 682         nlmsg_free(msg);
 683         return -EMSGSIZE;
 684 }
 685
 686 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 687 {
 688         struct sk_buff *msg;
 689         void *hdr;
 690
 691         pr_debug("DEP link is down\n");
 692
 693         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 694         if (!msg)
 695                 return -ENOMEM;
 696
 697         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 698                           NFC_CMD_DEP_LINK_DOWN);
 699         if (!hdr)
 700                 goto free_msg;
 701
 702         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 703                 goto nla_put_failure;
 704
 705         genlmsg_end(msg, hdr);
 706
 707         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 708
 709         return 0;
 710
 711 nla_put_failure:
 712 free_msg:
 713         nlmsg_free(msg);
 714         return -EMSGSIZE;
 715 }
 716
 717 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 718 {
 719         struct sk_buff *msg;
 720         struct nfc_dev *dev;
 721         u32 idx;
 722         int rc = -ENOBUFS;
 723
 724         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 725                 return -EINVAL;
 726
 727         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 728
 729         dev = nfc_get_device(idx);
 730         if (!dev)
 731                 return -ENODEV;
 732
 733         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 734         if (!msg) {
 735                 rc = -ENOMEM;
 736                 goto out_putdev;
 737         }
 738
 739         rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
 740                                   NULL, 0);
 741         if (rc < 0)
 742                 goto out_free;
 743
 744         nfc_put_device(dev);
 745
 746         return genlmsg_reply(msg, info);
 747
 748 out_free:
 749         nlmsg_free(msg);
 750 out_putdev:
 751         nfc_put_device(dev);
 752         return rc;
 753 }
 754
 755 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 756 {
 757         struct nfc_dev *dev;
 758         int rc;
 759         u32 idx;
 760
 761         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 762                 return -EINVAL;
 763
 764         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 765
 766         dev = nfc_get_device(idx);
 767         if (!dev)
 768                 return -ENODEV;
 769
 770         rc = nfc_dev_up(dev);
 771
 772         nfc_put_device(dev);
 773         return rc;
 774 }
 775
 776 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 777 {
 778         struct nfc_dev *dev;
 779         int rc;
 780         u32 idx;
 781
 782         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 783                 return -EINVAL;
 784
 785         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 786
 787         dev = nfc_get_device(idx);
 788         if (!dev)
 789                 return -ENODEV;
 790
 791         rc = nfc_dev_down(dev);
 792
 793         nfc_put_device(dev);
 794         return rc;
 795 }
 796
 797 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 798 {
 799         struct nfc_dev *dev;
 800         int rc;
 801         u32 idx;
 802         u32 im_protocols = 0, tm_protocols = 0;
 803
 804         pr_debug("Poll start\n");
 805
 806         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 807             ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
 808               !info->attrs[NFC_ATTR_PROTOCOLS]) &&
 809               !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
 810                 return -EINVAL;
 811
 812         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 813
 814         if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
 815                 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
 816
 817         if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
 818                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
 819         else if (info->attrs[NFC_ATTR_PROTOCOLS])
 820                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 821
 822         dev = nfc_get_device(idx);
 823         if (!dev)
 824                 return -ENODEV;
 825
 826         mutex_lock(&dev->genl_data.genl_data_mutex);
 827
 828         rc = nfc_start_poll(dev, im_protocols, tm_protocols);
 829         if (!rc)
 830                 dev->genl_data.poll_req_portid = info->snd_portid;
 831
 832         mutex_unlock(&dev->genl_data.genl_data_mutex);
 833
 834         nfc_put_device(dev);
 835         return rc;
 836 }
 837
 838 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 839 {
 840         struct nfc_dev *dev;
 841         int rc;
 842         u32 idx;
 843
 844         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 845                 return -EINVAL;
 846
 847         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 848
 849         dev = nfc_get_device(idx);
 850         if (!dev)
 851                 return -ENODEV;
 852
 853         device_lock(&dev->dev);
 854
 855         if (!dev->polling) {
 856                 device_unlock(&dev->dev);
 857                 nfc_put_device(dev);
 858                 return -EINVAL;
 859         }
 860
 861         device_unlock(&dev->dev);
 862
 863         mutex_lock(&dev->genl_data.genl_data_mutex);
 864
 865         if (dev->genl_data.poll_req_portid != info->snd_portid) {
 866                 rc = -EBUSY;
 867                 goto out;
 868         }
 869
 870         rc = nfc_stop_poll(dev);
 871         dev->genl_data.poll_req_portid = 0;
 872
 873 out:
 874         mutex_unlock(&dev->genl_data.genl_data_mutex);
 875         nfc_put_device(dev);
 876         return rc;
 877 }
 878
 879 static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
 880 {
 881         struct nfc_dev *dev;
 882         u32 device_idx, target_idx, protocol;
 883         int rc;
 884
 885         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 886             !info->attrs[NFC_ATTR_TARGET_INDEX] ||
 887             !info->attrs[NFC_ATTR_PROTOCOLS])
 888                 return -EINVAL;
 889
 890         device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 891
 892         dev = nfc_get_device(device_idx);
 893         if (!dev)
 894                 return -ENODEV;
 895
 896         target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 897         protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 898
 899         nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 900         rc = nfc_activate_target(dev, target_idx, protocol);
 901
 902         nfc_put_device(dev);
 903         return rc;
 904 }
 905
 906 static int nfc_genl_deactivate_target(struct sk_buff *skb,
 907                                       struct genl_info *info)
 908 {
 909         struct nfc_dev *dev;
 910         u32 device_idx, target_idx;
 911         int rc;
 912
 913         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 914             !info->attrs[NFC_ATTR_TARGET_INDEX])
 915                 return -EINVAL;
 916
 917         device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 918
 919         dev = nfc_get_device(device_idx);
 920         if (!dev)
 921                 return -ENODEV;
 922
 923         target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 924
 925         rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 926
 927         nfc_put_device(dev);
 928         return rc;
 929 }
 930
 931 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 932 {
 933         struct nfc_dev *dev;
 934         int rc, tgt_idx;
 935         u32 idx;
 936         u8 comm;
 937
 938         pr_debug("DEP link up\n");
 939
 940         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 941             !info->attrs[NFC_ATTR_COMM_MODE])
 942                 return -EINVAL;
 943
 944         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 945         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 946                 tgt_idx = NFC_TARGET_IDX_ANY;
 947         else
 948                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 949
 950         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 951
 952         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 953                 return -EINVAL;
 954
 955         dev = nfc_get_device(idx);
 956         if (!dev)
 957                 return -ENODEV;
 958
 959         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 960
 961         nfc_put_device(dev);
 962
 963         return rc;
 964 }
 965
 966 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 967 {
 968         struct nfc_dev *dev;
 969         int rc;
 970         u32 idx;
 971
 972         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 973             !info->attrs[NFC_ATTR_TARGET_INDEX])
 974                 return -EINVAL;
 975
 976         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 977
 978         dev = nfc_get_device(idx);
 979         if (!dev)
 980                 return -ENODEV;
 981
 982         rc = nfc_dep_link_down(dev);
 983
 984         nfc_put_device(dev);
 985         return rc;
 986 }
 987
 988 static int nfc_genl_send_params(struct sk_buff *msg,
 989                                 struct nfc_llcp_local *local,
 990                                 u32 portid, u32 seq)
 991 {
 992         void *hdr;
 993
 994         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
 995                           NFC_CMD_LLC_GET_PARAMS);
 996         if (!hdr)
 997                 return -EMSGSIZE;
 998
 999         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
1000             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
1001             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1002             nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1003                 goto nla_put_failure;
1004
1005         genlmsg_end(msg, hdr);
1006         return 0;
1007
1008 nla_put_failure:
1009         genlmsg_cancel(msg, hdr);
1010         return -EMSGSIZE;
1011 }
1012
1013 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1014 {
1015         struct nfc_dev *dev;
1016         struct nfc_llcp_local *local;
1017         int rc = 0;
1018         struct sk_buff *msg = NULL;
1019         u32 idx;
1020
1021         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1022             !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1023                 return -EINVAL;
1024
1025         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1026
1027         dev = nfc_get_device(idx);
1028         if (!dev)
1029                 return -ENODEV;
1030
1031         device_lock(&dev->dev);
1032
1033         local = nfc_llcp_find_local(dev);
1034         if (!local) {
1035                 rc = -ENODEV;
1036                 goto exit;
1037         }
1038
1039         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1040         if (!msg) {
1041                 rc = -ENOMEM;
1042                 goto exit;
1043         }
1044
1045         rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1046
1047 exit:
1048         device_unlock(&dev->dev);
1049
1050         nfc_put_device(dev);
1051
1052         if (rc < 0) {
1053                 if (msg)
1054                         nlmsg_free(msg);
1055
1056                 return rc;
1057         }
1058
1059         return genlmsg_reply(msg, info);
1060 }
1061
1062 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1063 {
1064         struct nfc_dev *dev;
1065         struct nfc_llcp_local *local;
1066         u8 rw = 0;
1067         u16 miux = 0;
1068         u32 idx;
1069         int rc = 0;
1070
1071         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1072             (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1073              !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1074              !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1075                 return -EINVAL;
1076
1077         if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1078                 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1079
1080                 if (rw > LLCP_MAX_RW)
1081                         return -EINVAL;
1082         }
1083
1084         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1085                 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1086
1087                 if (miux > LLCP_MAX_MIUX)
1088                         return -EINVAL;
1089         }
1090
1091         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1092
1093         dev = nfc_get_device(idx);
1094         if (!dev)
1095                 return -ENODEV;
1096
1097         device_lock(&dev->dev);
1098
1099         local = nfc_llcp_find_local(dev);
1100         if (!local) {
1101                 rc = -ENODEV;
1102                 goto exit;
1103         }
1104
1105         if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1106                 if (dev->dep_link_up) {
1107                         rc = -EINPROGRESS;
1108                         goto exit;
1109                 }
1110
1111                 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1112         }
1113
1114         if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1115                 local->rw = rw;
1116
1117         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1118                 local->miux = cpu_to_be16(miux);
1119
1120 exit:
1121         device_unlock(&dev->dev);
1122
1123         nfc_put_device(dev);
1124
1125         return rc;
1126 }
1127
1128 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1129 {
1130         struct nfc_dev *dev;
1131         struct nfc_llcp_local *local;
1132         struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1133         u32 idx;
1134         u8 tid;
1135         char *uri;
1136         int rc = 0, rem;
1137         size_t uri_len, tlvs_len;
1138         struct hlist_head sdreq_list;
1139         struct nfc_llcp_sdp_tlv *sdreq;
1140
1141         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1142             !info->attrs[NFC_ATTR_LLC_SDP])
1143                 return -EINVAL;
1144
1145         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1146
1147         dev = nfc_get_device(idx);
1148         if (!dev)
1149                 return -ENODEV;
1150
1151         device_lock(&dev->dev);
1152
1153         if (dev->dep_link_up == false) {
1154                 rc = -ENOLINK;
1155                 goto exit;
1156         }
1157
1158         local = nfc_llcp_find_local(dev);
1159         if (!local) {
1160                 rc = -ENODEV;
1161                 goto exit;
1162         }
1163
1164         INIT_HLIST_HEAD(&sdreq_list);
1165
1166         tlvs_len = 0;
1167
1168         nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1169                 rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX,
1170                                                  attr, nfc_sdp_genl_policy,
1171                                                  info->extack);
1172
1173                 if (rc != 0) {
1174                         rc = -EINVAL;
1175                         goto exit;
1176                 }
1177
1178                 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1179                         continue;
1180
1181                 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1182                 if (uri_len == 0)
1183                         continue;
1184
1185                 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1186                 if (uri == NULL || *uri == 0)
1187                         continue;
1188
1189                 tid = local->sdreq_next_tid++;
1190
1191                 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1192                 if (sdreq == NULL) {
1193                         rc = -ENOMEM;
1194                         goto exit;
1195                 }
1196
1197                 tlvs_len += sdreq->tlv_len;
1198
1199                 hlist_add_head(&sdreq->node, &sdreq_list);
1200         }
1201
1202         if (hlist_empty(&sdreq_list)) {
1203                 rc = -EINVAL;
1204                 goto exit;
1205         }
1206
1207         rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1208 exit:
1209         device_unlock(&dev->dev);
1210
1211         nfc_put_device(dev);
1212
1213         return rc;
1214 }
1215
1216 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1217 {
1218         struct nfc_dev *dev;
1219         int rc;
1220         u32 idx;
1221         char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1222
1223         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1224                 return -EINVAL;
1225
1226         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1227
1228         dev = nfc_get_device(idx);
1229         if (!dev)
1230                 return -ENODEV;
1231
1232         nla_strscpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1233                     sizeof(firmware_name));
1234
1235         rc = nfc_fw_download(dev, firmware_name);
1236
1237         nfc_put_device(dev);
1238         return rc;
1239 }
1240
1241 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1242                               u32 result)
1243 {
1244         struct sk_buff *msg;
1245         void *hdr;
1246
1247         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1248         if (!msg)
1249                 return -ENOMEM;
1250
1251         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1252                           NFC_CMD_FW_DOWNLOAD);
1253         if (!hdr)
1254                 goto free_msg;
1255
1256         if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1257             nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1258             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1259                 goto nla_put_failure;
1260
1261         genlmsg_end(msg, hdr);
1262
1263         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
1264
1265         return 0;
1266
1267 nla_put_failure:
1268 free_msg:
1269         nlmsg_free(msg);
1270         return -EMSGSIZE;
1271 }
1272
1273 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1274 {
1275         struct nfc_dev *dev;
1276         int rc;
1277         u32 idx, se_idx;
1278
1279         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1280             !info->attrs[NFC_ATTR_SE_INDEX])
1281                 return -EINVAL;
1282
1283         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1284         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1285
1286         dev = nfc_get_device(idx);
1287         if (!dev)
1288                 return -ENODEV;
1289
1290         rc = nfc_enable_se(dev, se_idx);
1291
1292         nfc_put_device(dev);
1293         return rc;
1294 }
1295
1296 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1297 {
1298         struct nfc_dev *dev;
1299         int rc;
1300         u32 idx, se_idx;
1301
1302         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1303             !info->attrs[NFC_ATTR_SE_INDEX])
1304                 return -EINVAL;
1305
1306         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1307         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1308
1309         dev = nfc_get_device(idx);
1310         if (!dev)
1311                 return -ENODEV;
1312
1313         rc = nfc_disable_se(dev, se_idx);
1314
1315         nfc_put_device(dev);
1316         return rc;
1317 }
1318
1319 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1320                                 u32 portid, u32 seq,
1321                                 struct netlink_callback *cb,
1322                                 int flags)
1323 {
1324         void *hdr;
1325         struct nfc_se *se, *n;
1326
1327         list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1328                 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1329                                   NFC_CMD_GET_SE);
1330                 if (!hdr)
1331                         goto nla_put_failure;
1332
1333                 if (cb)
1334                         genl_dump_check_consistent(cb, hdr);
1335
1336                 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1337                     nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1338                     nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1339                         goto nla_put_failure;
1340
1341                 genlmsg_end(msg, hdr);
1342         }
1343
1344         return 0;
1345
1346 nla_put_failure:
1347         genlmsg_cancel(msg, hdr);
1348         return -EMSGSIZE;
1349 }
1350
1351 static int nfc_genl_dump_ses(struct sk_buff *skb,
1352                                  struct netlink_callback *cb)
1353 {
1354         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1355         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1356         bool first_call = false;
1357
1358         if (!iter) {
1359                 first_call = true;
1360                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1361                 if (!iter)
1362                         return -ENOMEM;
1363                 cb->args[0] = (long) iter;
1364         }
1365
1366         mutex_lock(&nfc_devlist_mutex);
1367
1368         cb->seq = nfc_devlist_generation;
1369
1370         if (first_call) {
1371                 nfc_device_iter_init(iter);
1372                 dev = nfc_device_iter_next(iter);
1373         }
1374
1375         while (dev) {
1376                 int rc;
1377
1378                 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1379                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1380                 if (rc < 0)
1381                         break;
1382
1383                 dev = nfc_device_iter_next(iter);
1384         }
1385
1386         mutex_unlock(&nfc_devlist_mutex);
1387
1388         cb->args[1] = (long) dev;
1389
1390         return skb->len;
1391 }
1392
1393 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1394 {
1395         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1396
1397         if (iter) {
1398                 nfc_device_iter_exit(iter);
1399                 kfree(iter);
1400         }
1401
1402         return 0;
1403 }
1404
1405 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1406                      u8 *apdu, size_t apdu_length,
1407                      se_io_cb_t cb, void *cb_context)
1408 {
1409         struct nfc_se *se;
1410         int rc;
1411
1412         pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1413
1414         device_lock(&dev->dev);
1415
1416         if (!device_is_registered(&dev->dev)) {
1417                 rc = -ENODEV;
1418                 goto error;
1419         }
1420
1421         if (!dev->dev_up) {
1422                 rc = -ENODEV;
1423                 goto error;
1424         }
1425
1426         if (!dev->ops->se_io) {
1427                 rc = -EOPNOTSUPP;
1428                 goto error;
1429         }
1430
1431         se = nfc_find_se(dev, se_idx);
1432         if (!se) {
1433                 rc = -EINVAL;
1434                 goto error;
1435         }
1436
1437         if (se->state != NFC_SE_ENABLED) {
1438                 rc = -ENODEV;
1439                 goto error;
1440         }
1441
1442         rc = dev->ops->se_io(dev, se_idx, apdu,
1443                         apdu_length, cb, cb_context);
1444
1445         device_unlock(&dev->dev);
1446         return rc;
1447
1448 error:
1449         device_unlock(&dev->dev);
1450         kfree(cb_context);
1451         return rc;
1452 }
1453
1454 struct se_io_ctx {
1455         u32 dev_idx;
1456         u32 se_idx;
1457 };
1458
1459 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1460 {
1461         struct se_io_ctx *ctx = context;
1462         struct sk_buff *msg;
1463         void *hdr;
1464
1465         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1466         if (!msg) {
1467                 kfree(ctx);
1468                 return;
1469         }
1470
1471         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1472                           NFC_CMD_SE_IO);
1473         if (!hdr)
1474                 goto free_msg;
1475
1476         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1477             nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1478             nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1479                 goto nla_put_failure;
1480
1481         genlmsg_end(msg, hdr);
1482
1483         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1484
1485         kfree(ctx);
1486
1487         return;
1488
1489 nla_put_failure:
1490 free_msg:
1491         nlmsg_free(msg);
1492         kfree(ctx);
1493
1494         return;
1495 }
1496
1497 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1498 {
1499         struct nfc_dev *dev;
1500         struct se_io_ctx *ctx;
1501         u32 dev_idx, se_idx;
1502         u8 *apdu;
1503         size_t apdu_len;
1504         int rc;
1505
1506         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1507             !info->attrs[NFC_ATTR_SE_INDEX] ||
1508             !info->attrs[NFC_ATTR_SE_APDU])
1509                 return -EINVAL;
1510
1511         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1512         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1513
1514         dev = nfc_get_device(dev_idx);
1515         if (!dev)
1516                 return -ENODEV;
1517
1518         if (!dev->ops || !dev->ops->se_io) {
1519                 rc = -EOPNOTSUPP;
1520                 goto put_dev;
1521         }
1522
1523         apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1524         if (apdu_len == 0) {
1525                 rc = -EINVAL;
1526                 goto put_dev;
1527         }
1528
1529         apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1530         if (!apdu) {
1531                 rc = -EINVAL;
1532                 goto put_dev;
1533         }
1534
1535         ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1536         if (!ctx) {
1537                 rc = -ENOMEM;
1538                 goto put_dev;
1539         }
1540
1541         ctx->dev_idx = dev_idx;
1542         ctx->se_idx = se_idx;
1543
1544         rc = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1545
1546 put_dev:
1547         nfc_put_device(dev);
1548         return rc;
1549 }
1550
1551 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1552                                struct genl_info *info)
1553 {
1554         struct nfc_dev *dev;
1555         const struct nfc_vendor_cmd *cmd;
1556         u32 dev_idx, vid, subcmd;
1557         u8 *data;
1558         size_t data_len;
1559         int i, err;
1560
1561         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1562             !info->attrs[NFC_ATTR_VENDOR_ID] ||
1563             !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1564                 return -EINVAL;
1565
1566         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1567         vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1568         subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1569
1570         dev = nfc_get_device(dev_idx);
1571         if (!dev)
1572                 return -ENODEV;
1573
1574         if (!dev->vendor_cmds || !dev->n_vendor_cmds) {
1575                 err = -ENODEV;
1576                 goto put_dev;
1577         }
1578
1579         if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1580                 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1581                 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1582                 if (data_len == 0) {
1583                         err = -EINVAL;
1584                         goto put_dev;
1585                 }
1586         } else {
1587                 data = NULL;
1588                 data_len = 0;
1589         }
1590
1591         for (i = 0; i < dev->n_vendor_cmds; i++) {
1592                 cmd = &dev->vendor_cmds[i];
1593
1594                 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1595                         continue;
1596
1597                 dev->cur_cmd_info = info;
1598                 err = cmd->doit(dev, data, data_len);
1599                 dev->cur_cmd_info = NULL;
1600                 goto put_dev;
1601         }
1602
1603         err = -EOPNOTSUPP;
1604
1605 put_dev:
1606         nfc_put_device(dev);
1607         return err;
1608 }
1609
1610 /* message building helper */
1611 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1612                                 int flags, u8 cmd)
1613 {
1614         /* since there is no private header just add the generic one */
1615         return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1616 }
1617
1618 static struct sk_buff *
1619 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1620                            u32 portid, u32 seq,
1621                            enum nfc_attrs attr,
1622                            u32 oui, u32 subcmd, gfp_t gfp)
1623 {
1624         struct sk_buff *skb;
1625         void *hdr;
1626
1627         skb = nlmsg_new(approxlen + 100, gfp);
1628         if (!skb)
1629                 return NULL;
1630
1631         hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1632         if (!hdr) {
1633                 kfree_skb(skb);
1634                 return NULL;
1635         }
1636
1637         if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1638                 goto nla_put_failure;
1639         if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1640                 goto nla_put_failure;
1641         if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1642                 goto nla_put_failure;
1643
1644         ((void **)skb->cb)[0] = dev;
1645         ((void **)skb->cb)[1] = hdr;
1646
1647         return skb;
1648
1649 nla_put_failure:
1650         kfree_skb(skb);
1651         return NULL;
1652 }
1653
1654 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1655                                                  enum nfc_attrs attr,
1656                                                  u32 oui, u32 subcmd,
1657                                                  int approxlen)
1658 {
1659         if (WARN_ON(!dev->cur_cmd_info))
1660                 return NULL;
1661
1662         return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1663                                           dev->cur_cmd_info->snd_portid,
1664                                           dev->cur_cmd_info->snd_seq, attr,
1665                                           oui, subcmd, GFP_KERNEL);
1666 }
1667 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1668
1669 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1670 {
1671         struct nfc_dev *dev = ((void **)skb->cb)[0];
1672         void *hdr = ((void **)skb->cb)[1];
1673
1674         /* clear CB data for netlink core to own from now on */
1675         memset(skb->cb, 0, sizeof(skb->cb));
1676
1677         if (WARN_ON(!dev->cur_cmd_info)) {
1678                 kfree_skb(skb);
1679                 return -EINVAL;
1680         }
1681
1682         genlmsg_end(skb, hdr);
1683         return genlmsg_reply(skb, dev->cur_cmd_info);
1684 }
1685 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1686
1687 static const struct genl_ops nfc_genl_ops[] = {
1688         {
1689                 .cmd = NFC_CMD_GET_DEVICE,
1690                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1691                 .doit = nfc_genl_get_device,
1692                 .dumpit = nfc_genl_dump_devices,
1693                 .done = nfc_genl_dump_devices_done,
1694         },
1695         {
1696                 .cmd = NFC_CMD_DEV_UP,
1697                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1698                 .doit = nfc_genl_dev_up,
1699                 .flags = GENL_ADMIN_PERM,
1700         },
1701         {
1702                 .cmd = NFC_CMD_DEV_DOWN,
1703                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1704                 .doit = nfc_genl_dev_down,
1705                 .flags = GENL_ADMIN_PERM,
1706         },
1707         {
1708                 .cmd = NFC_CMD_START_POLL,
1709                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1710                 .doit = nfc_genl_start_poll,
1711                 .flags = GENL_ADMIN_PERM,
1712         },
1713         {
1714                 .cmd = NFC_CMD_STOP_POLL,
1715                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1716                 .doit = nfc_genl_stop_poll,
1717                 .flags = GENL_ADMIN_PERM,
1718         },
1719         {
1720                 .cmd = NFC_CMD_DEP_LINK_UP,
1721                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1722                 .doit = nfc_genl_dep_link_up,
1723                 .flags = GENL_ADMIN_PERM,
1724         },
1725         {
1726                 .cmd = NFC_CMD_DEP_LINK_DOWN,
1727                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1728                 .doit = nfc_genl_dep_link_down,
1729                 .flags = GENL_ADMIN_PERM,
1730         },
1731         {
1732                 .cmd = NFC_CMD_GET_TARGET,
1733                 .validate = GENL_DONT_VALIDATE_STRICT |
1734                             GENL_DONT_VALIDATE_DUMP_STRICT,
1735                 .dumpit = nfc_genl_dump_targets,
1736                 .done = nfc_genl_dump_targets_done,
1737         },
1738         {
1739                 .cmd = NFC_CMD_LLC_GET_PARAMS,
1740                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1741                 .doit = nfc_genl_llc_get_params,
1742         },
1743         {
1744                 .cmd = NFC_CMD_LLC_SET_PARAMS,
1745                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1746                 .doit = nfc_genl_llc_set_params,
1747                 .flags = GENL_ADMIN_PERM,
1748         },
1749         {
1750                 .cmd = NFC_CMD_LLC_SDREQ,
1751                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1752                 .doit = nfc_genl_llc_sdreq,
1753                 .flags = GENL_ADMIN_PERM,
1754         },
1755         {
1756                 .cmd = NFC_CMD_FW_DOWNLOAD,
1757                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1758                 .doit = nfc_genl_fw_download,
1759                 .flags = GENL_ADMIN_PERM,
1760         },
1761         {
1762                 .cmd = NFC_CMD_ENABLE_SE,
1763                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1764                 .doit = nfc_genl_enable_se,
1765                 .flags = GENL_ADMIN_PERM,
1766         },
1767         {
1768                 .cmd = NFC_CMD_DISABLE_SE,
1769                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1770                 .doit = nfc_genl_disable_se,
1771                 .flags = GENL_ADMIN_PERM,
1772         },
1773         {
1774                 .cmd = NFC_CMD_GET_SE,
1775                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1776                 .dumpit = nfc_genl_dump_ses,
1777                 .done = nfc_genl_dump_ses_done,
1778         },
1779         {
1780                 .cmd = NFC_CMD_SE_IO,
1781                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1782                 .doit = nfc_genl_se_io,
1783                 .flags = GENL_ADMIN_PERM,
1784         },
1785         {
1786                 .cmd = NFC_CMD_ACTIVATE_TARGET,
1787                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1788                 .doit = nfc_genl_activate_target,
1789                 .flags = GENL_ADMIN_PERM,
1790         },
1791         {
1792                 .cmd = NFC_CMD_VENDOR,
1793                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1794                 .doit = nfc_genl_vendor_cmd,
1795                 .flags = GENL_ADMIN_PERM,
1796         },
1797         {
1798                 .cmd = NFC_CMD_DEACTIVATE_TARGET,
1799                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1800                 .doit = nfc_genl_deactivate_target,
1801                 .flags = GENL_ADMIN_PERM,
1802         },
1803 };
1804
1805 static struct genl_family nfc_genl_family __ro_after_init = {
1806         .hdrsize = 0,
1807         .name = NFC_GENL_NAME,
1808         .version = NFC_GENL_VERSION,
1809         .maxattr = NFC_ATTR_MAX,
1810         .policy = nfc_genl_policy,
1811         .module = THIS_MODULE,
1812         .ops = nfc_genl_ops,
1813         .n_ops = ARRAY_SIZE(nfc_genl_ops),
1814         .resv_start_op = NFC_CMD_DEACTIVATE_TARGET + 1,
1815         .mcgrps = nfc_genl_mcgrps,
1816         .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1817 };
1818
1819
1820 struct urelease_work {
1821         struct  work_struct w;
1822         u32     portid;
1823 };
1824
1825 static void nfc_urelease_event_work(struct work_struct *work)
1826 {
1827         struct urelease_work *w = container_of(work, struct urelease_work, w);
1828         struct class_dev_iter iter;
1829         struct nfc_dev *dev;
1830
1831         pr_debug("portid %d\n", w->portid);
1832
1833         mutex_lock(&nfc_devlist_mutex);
1834
1835         nfc_device_iter_init(&iter);
1836         dev = nfc_device_iter_next(&iter);
1837
1838         while (dev) {
1839                 mutex_lock(&dev->genl_data.genl_data_mutex);
1840
1841                 if (dev->genl_data.poll_req_portid == w->portid) {
1842                         nfc_stop_poll(dev);
1843                         dev->genl_data.poll_req_portid = 0;
1844                 }
1845
1846                 mutex_unlock(&dev->genl_data.genl_data_mutex);
1847
1848                 dev = nfc_device_iter_next(&iter);
1849         }
1850
1851         nfc_device_iter_exit(&iter);
1852
1853         mutex_unlock(&nfc_devlist_mutex);
1854
1855         kfree(w);
1856 }
1857
1858 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1859                                  unsigned long event, void *ptr)
1860 {
1861         struct netlink_notify *n = ptr;
1862         struct urelease_work *w;
1863
1864         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1865                 goto out;
1866
1867         pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1868
1869         w = kmalloc(sizeof(*w), GFP_ATOMIC);
1870         if (w) {
1871                 INIT_WORK(&w->w, nfc_urelease_event_work);
1872                 w->portid = n->portid;
1873                 schedule_work(&w->w);
1874         }
1875
1876 out:
1877         return NOTIFY_DONE;
1878 }
1879
1880 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1881 {
1882         genl_data->poll_req_portid = 0;
1883         mutex_init(&genl_data->genl_data_mutex);
1884 }
1885
1886 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1887 {
1888         mutex_destroy(&genl_data->genl_data_mutex);
1889 }
1890
1891 static struct notifier_block nl_notifier = {
1892         .notifier_call  = nfc_genl_rcv_nl_event,
1893 };
1894
1895 /**
1896  * nfc_genl_init() - Initialize netlink interface
1897  *
1898  * This initialization function registers the nfc netlink family.
1899  */
1900 int __init nfc_genl_init(void)
1901 {
1902         int rc;
1903
1904         rc = genl_register_family(&nfc_genl_family);
1905         if (rc)
1906                 return rc;
1907
1908         netlink_register_notifier(&nl_notifier);
1909
1910         return 0;
1911 }
1912
1913 /**
1914  * nfc_genl_exit() - Deinitialize netlink interface
1915  *
1916  * This exit function unregisters the nfc netlink family.
1917  */
1918 void nfc_genl_exit(void)
1919 {
1920         netlink_unregister_notifier(&nl_notifier);
1921         genl_unregister_family(&nfc_genl_family);
1922 }