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->info.attrs[NFC_ATTR_DEVICE_INDEX])
 114                 return ERR_PTR(-EINVAL);
 115
 116         idx = nla_get_u32(info->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                 return -EINVAL;
 974
 975         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 976
 977         dev = nfc_get_device(idx);
 978         if (!dev)
 979                 return -ENODEV;
 980
 981         rc = nfc_dep_link_down(dev);
 982
 983         nfc_put_device(dev);
 984         return rc;
 985 }
 986
 987 static int nfc_genl_send_params(struct sk_buff *msg,
 988                                 struct nfc_llcp_local *local,
 989                                 u32 portid, u32 seq)
 990 {
 991         void *hdr;
 992
 993         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
 994                           NFC_CMD_LLC_GET_PARAMS);
 995         if (!hdr)
 996                 return -EMSGSIZE;
 997
 998         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
 999             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
1000             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1001             nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1002                 goto nla_put_failure;
1003
1004         genlmsg_end(msg, hdr);
1005         return 0;
1006
1007 nla_put_failure:
1008         genlmsg_cancel(msg, hdr);
1009         return -EMSGSIZE;
1010 }
1011
1012 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1013 {
1014         struct nfc_dev *dev;
1015         struct nfc_llcp_local *local;
1016         int rc = 0;
1017         struct sk_buff *msg = NULL;
1018         u32 idx;
1019
1020         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1021                 return -EINVAL;
1022
1023         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1024
1025         dev = nfc_get_device(idx);
1026         if (!dev)
1027                 return -ENODEV;
1028
1029         device_lock(&dev->dev);
1030
1031         local = nfc_llcp_find_local(dev);
1032         if (!local) {
1033                 rc = -ENODEV;
1034                 goto exit;
1035         }
1036
1037         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1038         if (!msg) {
1039                 rc = -ENOMEM;
1040                 goto put_local;
1041         }
1042
1043         rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1044
1045 put_local:
1046         nfc_llcp_local_put(local);
1047
1048 exit:
1049         device_unlock(&dev->dev);
1050
1051         nfc_put_device(dev);
1052
1053         if (rc < 0) {
1054                 if (msg)
1055                         nlmsg_free(msg);
1056
1057                 return rc;
1058         }
1059
1060         return genlmsg_reply(msg, info);
1061 }
1062
1063 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1064 {
1065         struct nfc_dev *dev;
1066         struct nfc_llcp_local *local;
1067         u8 rw = 0;
1068         u16 miux = 0;
1069         u32 idx;
1070         int rc = 0;
1071
1072         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1073             (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1074              !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1075              !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1076                 return -EINVAL;
1077
1078         if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1079                 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1080
1081                 if (rw > LLCP_MAX_RW)
1082                         return -EINVAL;
1083         }
1084
1085         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1086                 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1087
1088                 if (miux > LLCP_MAX_MIUX)
1089                         return -EINVAL;
1090         }
1091
1092         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1093
1094         dev = nfc_get_device(idx);
1095         if (!dev)
1096                 return -ENODEV;
1097
1098         device_lock(&dev->dev);
1099
1100         local = nfc_llcp_find_local(dev);
1101         if (!local) {
1102                 rc = -ENODEV;
1103                 goto exit;
1104         }
1105
1106         if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1107                 if (dev->dep_link_up) {
1108                         rc = -EINPROGRESS;
1109                         goto put_local;
1110                 }
1111
1112                 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1113         }
1114
1115         if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1116                 local->rw = rw;
1117
1118         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1119                 local->miux = cpu_to_be16(miux);
1120
1121 put_local:
1122         nfc_llcp_local_put(local);
1123
1124 exit:
1125         device_unlock(&dev->dev);
1126
1127         nfc_put_device(dev);
1128
1129         return rc;
1130 }
1131
1132 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1133 {
1134         struct nfc_dev *dev;
1135         struct nfc_llcp_local *local;
1136         struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1137         u32 idx;
1138         u8 tid;
1139         char *uri;
1140         int rc = 0, rem;
1141         size_t uri_len, tlvs_len;
1142         struct hlist_head sdreq_list;
1143         struct nfc_llcp_sdp_tlv *sdreq;
1144
1145         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1146             !info->attrs[NFC_ATTR_LLC_SDP])
1147                 return -EINVAL;
1148
1149         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1150
1151         dev = nfc_get_device(idx);
1152         if (!dev)
1153                 return -ENODEV;
1154
1155         device_lock(&dev->dev);
1156
1157         if (dev->dep_link_up == false) {
1158                 rc = -ENOLINK;
1159                 goto exit;
1160         }
1161
1162         local = nfc_llcp_find_local(dev);
1163         if (!local) {
1164                 rc = -ENODEV;
1165                 goto exit;
1166         }
1167
1168         INIT_HLIST_HEAD(&sdreq_list);
1169
1170         tlvs_len = 0;
1171
1172         nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1173                 rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX,
1174                                                  attr, nfc_sdp_genl_policy,
1175                                                  info->extack);
1176
1177                 if (rc != 0) {
1178                         rc = -EINVAL;
1179                         goto put_local;
1180                 }
1181
1182                 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1183                         continue;
1184
1185                 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1186                 if (uri_len == 0)
1187                         continue;
1188
1189                 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1190                 if (uri == NULL || *uri == 0)
1191                         continue;
1192
1193                 tid = local->sdreq_next_tid++;
1194
1195                 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1196                 if (sdreq == NULL) {
1197                         rc = -ENOMEM;
1198                         goto put_local;
1199                 }
1200
1201                 tlvs_len += sdreq->tlv_len;
1202
1203                 hlist_add_head(&sdreq->node, &sdreq_list);
1204         }
1205
1206         if (hlist_empty(&sdreq_list)) {
1207                 rc = -EINVAL;
1208                 goto put_local;
1209         }
1210
1211         rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1212
1213 put_local:
1214         nfc_llcp_local_put(local);
1215
1216 exit:
1217         device_unlock(&dev->dev);
1218
1219         nfc_put_device(dev);
1220
1221         return rc;
1222 }
1223
1224 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1225 {
1226         struct nfc_dev *dev;
1227         int rc;
1228         u32 idx;
1229         char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1230
1231         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1232                 return -EINVAL;
1233
1234         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1235
1236         dev = nfc_get_device(idx);
1237         if (!dev)
1238                 return -ENODEV;
1239
1240         nla_strscpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1241                     sizeof(firmware_name));
1242
1243         rc = nfc_fw_download(dev, firmware_name);
1244
1245         nfc_put_device(dev);
1246         return rc;
1247 }
1248
1249 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1250                               u32 result)
1251 {
1252         struct sk_buff *msg;
1253         void *hdr;
1254
1255         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1256         if (!msg)
1257                 return -ENOMEM;
1258
1259         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1260                           NFC_CMD_FW_DOWNLOAD);
1261         if (!hdr)
1262                 goto free_msg;
1263
1264         if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1265             nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1266             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1267                 goto nla_put_failure;
1268
1269         genlmsg_end(msg, hdr);
1270
1271         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
1272
1273         return 0;
1274
1275 nla_put_failure:
1276 free_msg:
1277         nlmsg_free(msg);
1278         return -EMSGSIZE;
1279 }
1280
1281 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1282 {
1283         struct nfc_dev *dev;
1284         int rc;
1285         u32 idx, se_idx;
1286
1287         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1288             !info->attrs[NFC_ATTR_SE_INDEX])
1289                 return -EINVAL;
1290
1291         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1292         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1293
1294         dev = nfc_get_device(idx);
1295         if (!dev)
1296                 return -ENODEV;
1297
1298         rc = nfc_enable_se(dev, se_idx);
1299
1300         nfc_put_device(dev);
1301         return rc;
1302 }
1303
1304 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1305 {
1306         struct nfc_dev *dev;
1307         int rc;
1308         u32 idx, se_idx;
1309
1310         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1311             !info->attrs[NFC_ATTR_SE_INDEX])
1312                 return -EINVAL;
1313
1314         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1315         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1316
1317         dev = nfc_get_device(idx);
1318         if (!dev)
1319                 return -ENODEV;
1320
1321         rc = nfc_disable_se(dev, se_idx);
1322
1323         nfc_put_device(dev);
1324         return rc;
1325 }
1326
1327 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1328                                 u32 portid, u32 seq,
1329                                 struct netlink_callback *cb,
1330                                 int flags)
1331 {
1332         void *hdr;
1333         struct nfc_se *se, *n;
1334
1335         list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1336                 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1337                                   NFC_CMD_GET_SE);
1338                 if (!hdr)
1339                         goto nla_put_failure;
1340
1341                 if (cb)
1342                         genl_dump_check_consistent(cb, hdr);
1343
1344                 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1345                     nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1346                     nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1347                         goto nla_put_failure;
1348
1349                 genlmsg_end(msg, hdr);
1350         }
1351
1352         return 0;
1353
1354 nla_put_failure:
1355         genlmsg_cancel(msg, hdr);
1356         return -EMSGSIZE;
1357 }
1358
1359 static int nfc_genl_dump_ses(struct sk_buff *skb,
1360                                  struct netlink_callback *cb)
1361 {
1362         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1363         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1364         bool first_call = false;
1365
1366         if (!iter) {
1367                 first_call = true;
1368                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1369                 if (!iter)
1370                         return -ENOMEM;
1371                 cb->args[0] = (long) iter;
1372         }
1373
1374         mutex_lock(&nfc_devlist_mutex);
1375
1376         cb->seq = nfc_devlist_generation;
1377
1378         if (first_call) {
1379                 nfc_device_iter_init(iter);
1380                 dev = nfc_device_iter_next(iter);
1381         }
1382
1383         while (dev) {
1384                 int rc;
1385
1386                 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1387                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1388                 if (rc < 0)
1389                         break;
1390
1391                 dev = nfc_device_iter_next(iter);
1392         }
1393
1394         mutex_unlock(&nfc_devlist_mutex);
1395
1396         cb->args[1] = (long) dev;
1397
1398         return skb->len;
1399 }
1400
1401 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1402 {
1403         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1404
1405         if (iter) {
1406                 nfc_device_iter_exit(iter);
1407                 kfree(iter);
1408         }
1409
1410         return 0;
1411 }
1412
1413 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1414                      u8 *apdu, size_t apdu_length,
1415                      se_io_cb_t cb, void *cb_context)
1416 {
1417         struct nfc_se *se;
1418         int rc;
1419
1420         pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1421
1422         device_lock(&dev->dev);
1423
1424         if (!device_is_registered(&dev->dev)) {
1425                 rc = -ENODEV;
1426                 goto error;
1427         }
1428
1429         if (!dev->dev_up) {
1430                 rc = -ENODEV;
1431                 goto error;
1432         }
1433
1434         if (!dev->ops->se_io) {
1435                 rc = -EOPNOTSUPP;
1436                 goto error;
1437         }
1438
1439         se = nfc_find_se(dev, se_idx);
1440         if (!se) {
1441                 rc = -EINVAL;
1442                 goto error;
1443         }
1444
1445         if (se->state != NFC_SE_ENABLED) {
1446                 rc = -ENODEV;
1447                 goto error;
1448         }
1449
1450         rc = dev->ops->se_io(dev, se_idx, apdu,
1451                         apdu_length, cb, cb_context);
1452
1453         device_unlock(&dev->dev);
1454         return rc;
1455
1456 error:
1457         device_unlock(&dev->dev);
1458         kfree(cb_context);
1459         return rc;
1460 }
1461
1462 struct se_io_ctx {
1463         u32 dev_idx;
1464         u32 se_idx;
1465 };
1466
1467 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1468 {
1469         struct se_io_ctx *ctx = context;
1470         struct sk_buff *msg;
1471         void *hdr;
1472
1473         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1474         if (!msg) {
1475                 kfree(ctx);
1476                 return;
1477         }
1478
1479         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1480                           NFC_CMD_SE_IO);
1481         if (!hdr)
1482                 goto free_msg;
1483
1484         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1485             nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1486             nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1487                 goto nla_put_failure;
1488
1489         genlmsg_end(msg, hdr);
1490
1491         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1492
1493         kfree(ctx);
1494
1495         return;
1496
1497 nla_put_failure:
1498 free_msg:
1499         nlmsg_free(msg);
1500         kfree(ctx);
1501
1502         return;
1503 }
1504
1505 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1506 {
1507         struct nfc_dev *dev;
1508         struct se_io_ctx *ctx;
1509         u32 dev_idx, se_idx;
1510         u8 *apdu;
1511         size_t apdu_len;
1512         int rc;
1513
1514         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1515             !info->attrs[NFC_ATTR_SE_INDEX] ||
1516             !info->attrs[NFC_ATTR_SE_APDU])
1517                 return -EINVAL;
1518
1519         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1520         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1521
1522         dev = nfc_get_device(dev_idx);
1523         if (!dev)
1524                 return -ENODEV;
1525
1526         if (!dev->ops || !dev->ops->se_io) {
1527                 rc = -EOPNOTSUPP;
1528                 goto put_dev;
1529         }
1530
1531         apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1532         if (apdu_len == 0) {
1533                 rc = -EINVAL;
1534                 goto put_dev;
1535         }
1536
1537         apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1538         if (!apdu) {
1539                 rc = -EINVAL;
1540                 goto put_dev;
1541         }
1542
1543         ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1544         if (!ctx) {
1545                 rc = -ENOMEM;
1546                 goto put_dev;
1547         }
1548
1549         ctx->dev_idx = dev_idx;
1550         ctx->se_idx = se_idx;
1551
1552         rc = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1553
1554 put_dev:
1555         nfc_put_device(dev);
1556         return rc;
1557 }
1558
1559 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1560                                struct genl_info *info)
1561 {
1562         struct nfc_dev *dev;
1563         const struct nfc_vendor_cmd *cmd;
1564         u32 dev_idx, vid, subcmd;
1565         u8 *data;
1566         size_t data_len;
1567         int i, err;
1568
1569         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1570             !info->attrs[NFC_ATTR_VENDOR_ID] ||
1571             !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1572                 return -EINVAL;
1573
1574         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1575         vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1576         subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1577
1578         dev = nfc_get_device(dev_idx);
1579         if (!dev)
1580                 return -ENODEV;
1581
1582         if (!dev->vendor_cmds || !dev->n_vendor_cmds) {
1583                 err = -ENODEV;
1584                 goto put_dev;
1585         }
1586
1587         if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1588                 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1589                 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1590                 if (data_len == 0) {
1591                         err = -EINVAL;
1592                         goto put_dev;
1593                 }
1594         } else {
1595                 data = NULL;
1596                 data_len = 0;
1597         }
1598
1599         for (i = 0; i < dev->n_vendor_cmds; i++) {
1600                 cmd = &dev->vendor_cmds[i];
1601
1602                 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1603                         continue;
1604
1605                 dev->cur_cmd_info = info;
1606                 err = cmd->doit(dev, data, data_len);
1607                 dev->cur_cmd_info = NULL;
1608                 goto put_dev;
1609         }
1610
1611         err = -EOPNOTSUPP;
1612
1613 put_dev:
1614         nfc_put_device(dev);
1615         return err;
1616 }
1617
1618 /* message building helper */
1619 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1620                                 int flags, u8 cmd)
1621 {
1622         /* since there is no private header just add the generic one */
1623         return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1624 }
1625
1626 static struct sk_buff *
1627 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1628                            u32 portid, u32 seq,
1629                            enum nfc_attrs attr,
1630                            u32 oui, u32 subcmd, gfp_t gfp)
1631 {
1632         struct sk_buff *skb;
1633         void *hdr;
1634
1635         skb = nlmsg_new(approxlen + 100, gfp);
1636         if (!skb)
1637                 return NULL;
1638
1639         hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1640         if (!hdr) {
1641                 kfree_skb(skb);
1642                 return NULL;
1643         }
1644
1645         if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1646                 goto nla_put_failure;
1647         if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1648                 goto nla_put_failure;
1649         if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1650                 goto nla_put_failure;
1651
1652         ((void **)skb->cb)[0] = dev;
1653         ((void **)skb->cb)[1] = hdr;
1654
1655         return skb;
1656
1657 nla_put_failure:
1658         kfree_skb(skb);
1659         return NULL;
1660 }
1661
1662 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1663                                                  enum nfc_attrs attr,
1664                                                  u32 oui, u32 subcmd,
1665                                                  int approxlen)
1666 {
1667         if (WARN_ON(!dev->cur_cmd_info))
1668                 return NULL;
1669
1670         return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1671                                           dev->cur_cmd_info->snd_portid,
1672                                           dev->cur_cmd_info->snd_seq, attr,
1673                                           oui, subcmd, GFP_KERNEL);
1674 }
1675 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1676
1677 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1678 {
1679         struct nfc_dev *dev = ((void **)skb->cb)[0];
1680         void *hdr = ((void **)skb->cb)[1];
1681
1682         /* clear CB data for netlink core to own from now on */
1683         memset(skb->cb, 0, sizeof(skb->cb));
1684
1685         if (WARN_ON(!dev->cur_cmd_info)) {
1686                 kfree_skb(skb);
1687                 return -EINVAL;
1688         }
1689
1690         genlmsg_end(skb, hdr);
1691         return genlmsg_reply(skb, dev->cur_cmd_info);
1692 }
1693 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1694
1695 static const struct genl_ops nfc_genl_ops[] = {
1696         {
1697                 .cmd = NFC_CMD_GET_DEVICE,
1698                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1699                 .doit = nfc_genl_get_device,
1700                 .dumpit = nfc_genl_dump_devices,
1701                 .done = nfc_genl_dump_devices_done,
1702         },
1703         {
1704                 .cmd = NFC_CMD_DEV_UP,
1705                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1706                 .doit = nfc_genl_dev_up,
1707                 .flags = GENL_ADMIN_PERM,
1708         },
1709         {
1710                 .cmd = NFC_CMD_DEV_DOWN,
1711                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1712                 .doit = nfc_genl_dev_down,
1713                 .flags = GENL_ADMIN_PERM,
1714         },
1715         {
1716                 .cmd = NFC_CMD_START_POLL,
1717                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1718                 .doit = nfc_genl_start_poll,
1719                 .flags = GENL_ADMIN_PERM,
1720         },
1721         {
1722                 .cmd = NFC_CMD_STOP_POLL,
1723                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1724                 .doit = nfc_genl_stop_poll,
1725                 .flags = GENL_ADMIN_PERM,
1726         },
1727         {
1728                 .cmd = NFC_CMD_DEP_LINK_UP,
1729                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1730                 .doit = nfc_genl_dep_link_up,
1731                 .flags = GENL_ADMIN_PERM,
1732         },
1733         {
1734                 .cmd = NFC_CMD_DEP_LINK_DOWN,
1735                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1736                 .doit = nfc_genl_dep_link_down,
1737                 .flags = GENL_ADMIN_PERM,
1738         },
1739         {
1740                 .cmd = NFC_CMD_GET_TARGET,
1741                 .validate = GENL_DONT_VALIDATE_STRICT |
1742                             GENL_DONT_VALIDATE_DUMP_STRICT,
1743                 .dumpit = nfc_genl_dump_targets,
1744                 .done = nfc_genl_dump_targets_done,
1745         },
1746         {
1747                 .cmd = NFC_CMD_LLC_GET_PARAMS,
1748                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1749                 .doit = nfc_genl_llc_get_params,
1750         },
1751         {
1752                 .cmd = NFC_CMD_LLC_SET_PARAMS,
1753                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1754                 .doit = nfc_genl_llc_set_params,
1755                 .flags = GENL_ADMIN_PERM,
1756         },
1757         {
1758                 .cmd = NFC_CMD_LLC_SDREQ,
1759                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1760                 .doit = nfc_genl_llc_sdreq,
1761                 .flags = GENL_ADMIN_PERM,
1762         },
1763         {
1764                 .cmd = NFC_CMD_FW_DOWNLOAD,
1765                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1766                 .doit = nfc_genl_fw_download,
1767                 .flags = GENL_ADMIN_PERM,
1768         },
1769         {
1770                 .cmd = NFC_CMD_ENABLE_SE,
1771                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1772                 .doit = nfc_genl_enable_se,
1773                 .flags = GENL_ADMIN_PERM,
1774         },
1775         {
1776                 .cmd = NFC_CMD_DISABLE_SE,
1777                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1778                 .doit = nfc_genl_disable_se,
1779                 .flags = GENL_ADMIN_PERM,
1780         },
1781         {
1782                 .cmd = NFC_CMD_GET_SE,
1783                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1784                 .dumpit = nfc_genl_dump_ses,
1785                 .done = nfc_genl_dump_ses_done,
1786         },
1787         {
1788                 .cmd = NFC_CMD_SE_IO,
1789                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1790                 .doit = nfc_genl_se_io,
1791                 .flags = GENL_ADMIN_PERM,
1792         },
1793         {
1794                 .cmd = NFC_CMD_ACTIVATE_TARGET,
1795                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1796                 .doit = nfc_genl_activate_target,
1797                 .flags = GENL_ADMIN_PERM,
1798         },
1799         {
1800                 .cmd = NFC_CMD_VENDOR,
1801                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1802                 .doit = nfc_genl_vendor_cmd,
1803                 .flags = GENL_ADMIN_PERM,
1804         },
1805         {
1806                 .cmd = NFC_CMD_DEACTIVATE_TARGET,
1807                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1808                 .doit = nfc_genl_deactivate_target,
1809                 .flags = GENL_ADMIN_PERM,
1810         },
1811 };
1812
1813 static struct genl_family nfc_genl_family __ro_after_init = {
1814         .hdrsize = 0,
1815         .name = NFC_GENL_NAME,
1816         .version = NFC_GENL_VERSION,
1817         .maxattr = NFC_ATTR_MAX,
1818         .policy = nfc_genl_policy,
1819         .module = THIS_MODULE,
1820         .ops = nfc_genl_ops,
1821         .n_ops = ARRAY_SIZE(nfc_genl_ops),
1822         .resv_start_op = NFC_CMD_DEACTIVATE_TARGET + 1,
1823         .mcgrps = nfc_genl_mcgrps,
1824         .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1825 };
1826
1827
1828 struct urelease_work {
1829         struct  work_struct w;
1830         u32     portid;
1831 };
1832
1833 static void nfc_urelease_event_work(struct work_struct *work)
1834 {
1835         struct urelease_work *w = container_of(work, struct urelease_work, w);
1836         struct class_dev_iter iter;
1837         struct nfc_dev *dev;
1838
1839         pr_debug("portid %d\n", w->portid);
1840
1841         mutex_lock(&nfc_devlist_mutex);
1842
1843         nfc_device_iter_init(&iter);
1844         dev = nfc_device_iter_next(&iter);
1845
1846         while (dev) {
1847                 mutex_lock(&dev->genl_data.genl_data_mutex);
1848
1849                 if (dev->genl_data.poll_req_portid == w->portid) {
1850                         nfc_stop_poll(dev);
1851                         dev->genl_data.poll_req_portid = 0;
1852                 }
1853
1854                 mutex_unlock(&dev->genl_data.genl_data_mutex);
1855
1856                 dev = nfc_device_iter_next(&iter);
1857         }
1858
1859         nfc_device_iter_exit(&iter);
1860
1861         mutex_unlock(&nfc_devlist_mutex);
1862
1863         kfree(w);
1864 }
1865
1866 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1867                                  unsigned long event, void *ptr)
1868 {
1869         struct netlink_notify *n = ptr;
1870         struct urelease_work *w;
1871
1872         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1873                 goto out;
1874
1875         pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1876
1877         w = kmalloc(sizeof(*w), GFP_ATOMIC);
1878         if (w) {
1879                 INIT_WORK(&w->w, nfc_urelease_event_work);
1880                 w->portid = n->portid;
1881                 schedule_work(&w->w);
1882         }
1883
1884 out:
1885         return NOTIFY_DONE;
1886 }
1887
1888 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1889 {
1890         genl_data->poll_req_portid = 0;
1891         mutex_init(&genl_data->genl_data_mutex);
1892 }
1893
1894 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1895 {
1896         mutex_destroy(&genl_data->genl_data_mutex);
1897 }
1898
1899 static struct notifier_block nl_notifier = {
1900         .notifier_call  = nfc_genl_rcv_nl_event,
1901 };
1902
1903 /**
1904  * nfc_genl_init() - Initialize netlink interface
1905  *
1906  * This initialization function registers the nfc netlink family.
1907  */
1908 int __init nfc_genl_init(void)
1909 {
1910         int rc;
1911
1912         rc = genl_register_family(&nfc_genl_family);
1913         if (rc)
1914                 return rc;
1915
1916         netlink_register_notifier(&nl_notifier);
1917
1918         return 0;
1919 }
1920
1921 /**
1922  * nfc_genl_exit() - Deinitialize netlink interface
1923  *
1924  * This exit function unregisters the nfc netlink family.
1925  */
1926 void nfc_genl_exit(void)
1927 {
1928         netlink_unregister_notifier(&nl_notifier);
1929         genl_unregister_family(&nfc_genl_family);
1930 }