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         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         nfc_device_iter_exit(iter);
 640         kfree(iter);
 641
 642         return 0;
 643 }
 644
 645 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 646                                u8 comm_mode, u8 rf_mode)
 647 {
 648         struct sk_buff *msg;
 649         void *hdr;
 650
 651         pr_debug("DEP link is up\n");
 652
 653         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 654         if (!msg)
 655                 return -ENOMEM;
 656
 657         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
 658         if (!hdr)
 659                 goto free_msg;
 660
 661         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 662                 goto nla_put_failure;
 663         if (rf_mode == NFC_RF_INITIATOR &&
 664             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 665                 goto nla_put_failure;
 666         if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
 667             nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
 668                 goto nla_put_failure;
 669
 670         genlmsg_end(msg, hdr);
 671
 672         dev->dep_link_up = true;
 673
 674         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 675
 676         return 0;
 677
 678 nla_put_failure:
 679 free_msg:
 680         nlmsg_free(msg);
 681         return -EMSGSIZE;
 682 }
 683
 684 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 685 {
 686         struct sk_buff *msg;
 687         void *hdr;
 688
 689         pr_debug("DEP link is down\n");
 690
 691         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 692         if (!msg)
 693                 return -ENOMEM;
 694
 695         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 696                           NFC_CMD_DEP_LINK_DOWN);
 697         if (!hdr)
 698                 goto free_msg;
 699
 700         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 701                 goto nla_put_failure;
 702
 703         genlmsg_end(msg, hdr);
 704
 705         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 706
 707         return 0;
 708
 709 nla_put_failure:
 710 free_msg:
 711         nlmsg_free(msg);
 712         return -EMSGSIZE;
 713 }
 714
 715 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 716 {
 717         struct sk_buff *msg;
 718         struct nfc_dev *dev;
 719         u32 idx;
 720         int rc = -ENOBUFS;
 721
 722         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 723                 return -EINVAL;
 724
 725         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 726
 727         dev = nfc_get_device(idx);
 728         if (!dev)
 729                 return -ENODEV;
 730
 731         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 732         if (!msg) {
 733                 rc = -ENOMEM;
 734                 goto out_putdev;
 735         }
 736
 737         rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
 738                                   NULL, 0);
 739         if (rc < 0)
 740                 goto out_free;
 741
 742         nfc_put_device(dev);
 743
 744         return genlmsg_reply(msg, info);
 745
 746 out_free:
 747         nlmsg_free(msg);
 748 out_putdev:
 749         nfc_put_device(dev);
 750         return rc;
 751 }
 752
 753 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 754 {
 755         struct nfc_dev *dev;
 756         int rc;
 757         u32 idx;
 758
 759         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 760                 return -EINVAL;
 761
 762         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 763
 764         dev = nfc_get_device(idx);
 765         if (!dev)
 766                 return -ENODEV;
 767
 768         rc = nfc_dev_up(dev);
 769
 770         nfc_put_device(dev);
 771         return rc;
 772 }
 773
 774 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 775 {
 776         struct nfc_dev *dev;
 777         int rc;
 778         u32 idx;
 779
 780         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 781                 return -EINVAL;
 782
 783         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 784
 785         dev = nfc_get_device(idx);
 786         if (!dev)
 787                 return -ENODEV;
 788
 789         rc = nfc_dev_down(dev);
 790
 791         nfc_put_device(dev);
 792         return rc;
 793 }
 794
 795 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 796 {
 797         struct nfc_dev *dev;
 798         int rc;
 799         u32 idx;
 800         u32 im_protocols = 0, tm_protocols = 0;
 801
 802         pr_debug("Poll start\n");
 803
 804         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 805             ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
 806               !info->attrs[NFC_ATTR_PROTOCOLS]) &&
 807               !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
 808                 return -EINVAL;
 809
 810         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 811
 812         if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
 813                 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
 814
 815         if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
 816                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
 817         else if (info->attrs[NFC_ATTR_PROTOCOLS])
 818                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 819
 820         dev = nfc_get_device(idx);
 821         if (!dev)
 822                 return -ENODEV;
 823
 824         mutex_lock(&dev->genl_data.genl_data_mutex);
 825
 826         rc = nfc_start_poll(dev, im_protocols, tm_protocols);
 827         if (!rc)
 828                 dev->genl_data.poll_req_portid = info->snd_portid;
 829
 830         mutex_unlock(&dev->genl_data.genl_data_mutex);
 831
 832         nfc_put_device(dev);
 833         return rc;
 834 }
 835
 836 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 837 {
 838         struct nfc_dev *dev;
 839         int rc;
 840         u32 idx;
 841
 842         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 843                 return -EINVAL;
 844
 845         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 846
 847         dev = nfc_get_device(idx);
 848         if (!dev)
 849                 return -ENODEV;
 850
 851         device_lock(&dev->dev);
 852
 853         if (!dev->polling) {
 854                 device_unlock(&dev->dev);
 855                 return -EINVAL;
 856         }
 857
 858         device_unlock(&dev->dev);
 859
 860         mutex_lock(&dev->genl_data.genl_data_mutex);
 861
 862         if (dev->genl_data.poll_req_portid != info->snd_portid) {
 863                 rc = -EBUSY;
 864                 goto out;
 865         }
 866
 867         rc = nfc_stop_poll(dev);
 868         dev->genl_data.poll_req_portid = 0;
 869
 870 out:
 871         mutex_unlock(&dev->genl_data.genl_data_mutex);
 872         nfc_put_device(dev);
 873         return rc;
 874 }
 875
 876 static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
 877 {
 878         struct nfc_dev *dev;
 879         u32 device_idx, target_idx, protocol;
 880         int rc;
 881
 882         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 883             !info->attrs[NFC_ATTR_TARGET_INDEX] ||
 884             !info->attrs[NFC_ATTR_PROTOCOLS])
 885                 return -EINVAL;
 886
 887         device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 888
 889         dev = nfc_get_device(device_idx);
 890         if (!dev)
 891                 return -ENODEV;
 892
 893         target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 894         protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 895
 896         nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 897         rc = nfc_activate_target(dev, target_idx, protocol);
 898
 899         nfc_put_device(dev);
 900         return rc;
 901 }
 902
 903 static int nfc_genl_deactivate_target(struct sk_buff *skb,
 904                                       struct genl_info *info)
 905 {
 906         struct nfc_dev *dev;
 907         u32 device_idx, target_idx;
 908         int rc;
 909
 910         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 911             !info->attrs[NFC_ATTR_TARGET_INDEX])
 912                 return -EINVAL;
 913
 914         device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 915
 916         dev = nfc_get_device(device_idx);
 917         if (!dev)
 918                 return -ENODEV;
 919
 920         target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 921
 922         rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 923
 924         nfc_put_device(dev);
 925         return rc;
 926 }
 927
 928 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 929 {
 930         struct nfc_dev *dev;
 931         int rc, tgt_idx;
 932         u32 idx;
 933         u8 comm;
 934
 935         pr_debug("DEP link up\n");
 936
 937         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 938             !info->attrs[NFC_ATTR_COMM_MODE])
 939                 return -EINVAL;
 940
 941         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 942         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 943                 tgt_idx = NFC_TARGET_IDX_ANY;
 944         else
 945                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 946
 947         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 948
 949         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 950                 return -EINVAL;
 951
 952         dev = nfc_get_device(idx);
 953         if (!dev)
 954                 return -ENODEV;
 955
 956         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 957
 958         nfc_put_device(dev);
 959
 960         return rc;
 961 }
 962
 963 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 964 {
 965         struct nfc_dev *dev;
 966         int rc;
 967         u32 idx;
 968
 969         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 970             !info->attrs[NFC_ATTR_TARGET_INDEX])
 971                 return -EINVAL;
 972
 973         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 974
 975         dev = nfc_get_device(idx);
 976         if (!dev)
 977                 return -ENODEV;
 978
 979         rc = nfc_dep_link_down(dev);
 980
 981         nfc_put_device(dev);
 982         return rc;
 983 }
 984
 985 static int nfc_genl_send_params(struct sk_buff *msg,
 986                                 struct nfc_llcp_local *local,
 987                                 u32 portid, u32 seq)
 988 {
 989         void *hdr;
 990
 991         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
 992                           NFC_CMD_LLC_GET_PARAMS);
 993         if (!hdr)
 994                 return -EMSGSIZE;
 995
 996         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
 997             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
 998             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
 999             nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1000                 goto nla_put_failure;
1001
1002         genlmsg_end(msg, hdr);
1003         return 0;
1004
1005 nla_put_failure:
1006         genlmsg_cancel(msg, hdr);
1007         return -EMSGSIZE;
1008 }
1009
1010 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1011 {
1012         struct nfc_dev *dev;
1013         struct nfc_llcp_local *local;
1014         int rc = 0;
1015         struct sk_buff *msg = NULL;
1016         u32 idx;
1017
1018         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1019             !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1020                 return -EINVAL;
1021
1022         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1023
1024         dev = nfc_get_device(idx);
1025         if (!dev)
1026                 return -ENODEV;
1027
1028         device_lock(&dev->dev);
1029
1030         local = nfc_llcp_find_local(dev);
1031         if (!local) {
1032                 rc = -ENODEV;
1033                 goto exit;
1034         }
1035
1036         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1037         if (!msg) {
1038                 rc = -ENOMEM;
1039                 goto exit;
1040         }
1041
1042         rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1043
1044 exit:
1045         device_unlock(&dev->dev);
1046
1047         nfc_put_device(dev);
1048
1049         if (rc < 0) {
1050                 if (msg)
1051                         nlmsg_free(msg);
1052
1053                 return rc;
1054         }
1055
1056         return genlmsg_reply(msg, info);
1057 }
1058
1059 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1060 {
1061         struct nfc_dev *dev;
1062         struct nfc_llcp_local *local;
1063         u8 rw = 0;
1064         u16 miux = 0;
1065         u32 idx;
1066         int rc = 0;
1067
1068         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1069             (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1070              !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1071              !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1072                 return -EINVAL;
1073
1074         if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1075                 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1076
1077                 if (rw > LLCP_MAX_RW)
1078                         return -EINVAL;
1079         }
1080
1081         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1082                 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1083
1084                 if (miux > LLCP_MAX_MIUX)
1085                         return -EINVAL;
1086         }
1087
1088         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1089
1090         dev = nfc_get_device(idx);
1091         if (!dev)
1092                 return -ENODEV;
1093
1094         device_lock(&dev->dev);
1095
1096         local = nfc_llcp_find_local(dev);
1097         if (!local) {
1098                 rc = -ENODEV;
1099                 goto exit;
1100         }
1101
1102         if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1103                 if (dev->dep_link_up) {
1104                         rc = -EINPROGRESS;
1105                         goto exit;
1106                 }
1107
1108                 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1109         }
1110
1111         if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1112                 local->rw = rw;
1113
1114         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1115                 local->miux = cpu_to_be16(miux);
1116
1117 exit:
1118         device_unlock(&dev->dev);
1119
1120         nfc_put_device(dev);
1121
1122         return rc;
1123 }
1124
1125 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1126 {
1127         struct nfc_dev *dev;
1128         struct nfc_llcp_local *local;
1129         struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1130         u32 idx;
1131         u8 tid;
1132         char *uri;
1133         int rc = 0, rem;
1134         size_t uri_len, tlvs_len;
1135         struct hlist_head sdreq_list;
1136         struct nfc_llcp_sdp_tlv *sdreq;
1137
1138         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1139             !info->attrs[NFC_ATTR_LLC_SDP])
1140                 return -EINVAL;
1141
1142         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1143
1144         dev = nfc_get_device(idx);
1145         if (!dev)
1146                 return -ENODEV;
1147
1148         device_lock(&dev->dev);
1149
1150         if (dev->dep_link_up == false) {
1151                 rc = -ENOLINK;
1152                 goto exit;
1153         }
1154
1155         local = nfc_llcp_find_local(dev);
1156         if (!local) {
1157                 rc = -ENODEV;
1158                 goto exit;
1159         }
1160
1161         INIT_HLIST_HEAD(&sdreq_list);
1162
1163         tlvs_len = 0;
1164
1165         nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1166                 rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX,
1167                                                  attr, nfc_sdp_genl_policy,
1168                                                  info->extack);
1169
1170                 if (rc != 0) {
1171                         rc = -EINVAL;
1172                         goto exit;
1173                 }
1174
1175                 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1176                         continue;
1177
1178                 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1179                 if (uri_len == 0)
1180                         continue;
1181
1182                 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1183                 if (uri == NULL || *uri == 0)
1184                         continue;
1185
1186                 tid = local->sdreq_next_tid++;
1187
1188                 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1189                 if (sdreq == NULL) {
1190                         rc = -ENOMEM;
1191                         goto exit;
1192                 }
1193
1194                 tlvs_len += sdreq->tlv_len;
1195
1196                 hlist_add_head(&sdreq->node, &sdreq_list);
1197         }
1198
1199         if (hlist_empty(&sdreq_list)) {
1200                 rc = -EINVAL;
1201                 goto exit;
1202         }
1203
1204         rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1205 exit:
1206         device_unlock(&dev->dev);
1207
1208         nfc_put_device(dev);
1209
1210         return rc;
1211 }
1212
1213 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1214 {
1215         struct nfc_dev *dev;
1216         int rc;
1217         u32 idx;
1218         char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1219
1220         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1221                 return -EINVAL;
1222
1223         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1224
1225         dev = nfc_get_device(idx);
1226         if (!dev)
1227                 return -ENODEV;
1228
1229         nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1230                     sizeof(firmware_name));
1231
1232         rc = nfc_fw_download(dev, firmware_name);
1233
1234         nfc_put_device(dev);
1235         return rc;
1236 }
1237
1238 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1239                               u32 result)
1240 {
1241         struct sk_buff *msg;
1242         void *hdr;
1243
1244         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1245         if (!msg)
1246                 return -ENOMEM;
1247
1248         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1249                           NFC_CMD_FW_DOWNLOAD);
1250         if (!hdr)
1251                 goto free_msg;
1252
1253         if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1254             nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1255             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1256                 goto nla_put_failure;
1257
1258         genlmsg_end(msg, hdr);
1259
1260         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1261
1262         return 0;
1263
1264 nla_put_failure:
1265 free_msg:
1266         nlmsg_free(msg);
1267         return -EMSGSIZE;
1268 }
1269
1270 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1271 {
1272         struct nfc_dev *dev;
1273         int rc;
1274         u32 idx, se_idx;
1275
1276         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1277             !info->attrs[NFC_ATTR_SE_INDEX])
1278                 return -EINVAL;
1279
1280         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1281         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1282
1283         dev = nfc_get_device(idx);
1284         if (!dev)
1285                 return -ENODEV;
1286
1287         rc = nfc_enable_se(dev, se_idx);
1288
1289         nfc_put_device(dev);
1290         return rc;
1291 }
1292
1293 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1294 {
1295         struct nfc_dev *dev;
1296         int rc;
1297         u32 idx, se_idx;
1298
1299         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1300             !info->attrs[NFC_ATTR_SE_INDEX])
1301                 return -EINVAL;
1302
1303         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1304         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1305
1306         dev = nfc_get_device(idx);
1307         if (!dev)
1308                 return -ENODEV;
1309
1310         rc = nfc_disable_se(dev, se_idx);
1311
1312         nfc_put_device(dev);
1313         return rc;
1314 }
1315
1316 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1317                                 u32 portid, u32 seq,
1318                                 struct netlink_callback *cb,
1319                                 int flags)
1320 {
1321         void *hdr;
1322         struct nfc_se *se, *n;
1323
1324         list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1325                 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1326                                   NFC_CMD_GET_SE);
1327                 if (!hdr)
1328                         goto nla_put_failure;
1329
1330                 if (cb)
1331                         genl_dump_check_consistent(cb, hdr);
1332
1333                 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1334                     nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1335                     nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1336                         goto nla_put_failure;
1337
1338                 genlmsg_end(msg, hdr);
1339         }
1340
1341         return 0;
1342
1343 nla_put_failure:
1344         genlmsg_cancel(msg, hdr);
1345         return -EMSGSIZE;
1346 }
1347
1348 static int nfc_genl_dump_ses(struct sk_buff *skb,
1349                                  struct netlink_callback *cb)
1350 {
1351         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1352         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1353         bool first_call = false;
1354
1355         if (!iter) {
1356                 first_call = true;
1357                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1358                 if (!iter)
1359                         return -ENOMEM;
1360                 cb->args[0] = (long) iter;
1361         }
1362
1363         mutex_lock(&nfc_devlist_mutex);
1364
1365         cb->seq = nfc_devlist_generation;
1366
1367         if (first_call) {
1368                 nfc_device_iter_init(iter);
1369                 dev = nfc_device_iter_next(iter);
1370         }
1371
1372         while (dev) {
1373                 int rc;
1374
1375                 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1376                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1377                 if (rc < 0)
1378                         break;
1379
1380                 dev = nfc_device_iter_next(iter);
1381         }
1382
1383         mutex_unlock(&nfc_devlist_mutex);
1384
1385         cb->args[1] = (long) dev;
1386
1387         return skb->len;
1388 }
1389
1390 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1391 {
1392         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1393
1394         nfc_device_iter_exit(iter);
1395         kfree(iter);
1396
1397         return 0;
1398 }
1399
1400 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1401                      u8 *apdu, size_t apdu_length,
1402                      se_io_cb_t cb, void *cb_context)
1403 {
1404         struct nfc_se *se;
1405         int rc;
1406
1407         pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1408
1409         device_lock(&dev->dev);
1410
1411         if (!device_is_registered(&dev->dev)) {
1412                 rc = -ENODEV;
1413                 goto error;
1414         }
1415
1416         if (!dev->dev_up) {
1417                 rc = -ENODEV;
1418                 goto error;
1419         }
1420
1421         if (!dev->ops->se_io) {
1422                 rc = -EOPNOTSUPP;
1423                 goto error;
1424         }
1425
1426         se = nfc_find_se(dev, se_idx);
1427         if (!se) {
1428                 rc = -EINVAL;
1429                 goto error;
1430         }
1431
1432         if (se->state != NFC_SE_ENABLED) {
1433                 rc = -ENODEV;
1434                 goto error;
1435         }
1436
1437         rc = dev->ops->se_io(dev, se_idx, apdu,
1438                         apdu_length, cb, cb_context);
1439
1440 error:
1441         device_unlock(&dev->dev);
1442         return rc;
1443 }
1444
1445 struct se_io_ctx {
1446         u32 dev_idx;
1447         u32 se_idx;
1448 };
1449
1450 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1451 {
1452         struct se_io_ctx *ctx = context;
1453         struct sk_buff *msg;
1454         void *hdr;
1455
1456         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1457         if (!msg) {
1458                 kfree(ctx);
1459                 return;
1460         }
1461
1462         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1463                           NFC_CMD_SE_IO);
1464         if (!hdr)
1465                 goto free_msg;
1466
1467         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1468             nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1469             nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1470                 goto nla_put_failure;
1471
1472         genlmsg_end(msg, hdr);
1473
1474         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1475
1476         kfree(ctx);
1477
1478         return;
1479
1480 nla_put_failure:
1481 free_msg:
1482         nlmsg_free(msg);
1483         kfree(ctx);
1484
1485         return;
1486 }
1487
1488 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1489 {
1490         struct nfc_dev *dev;
1491         struct se_io_ctx *ctx;
1492         u32 dev_idx, se_idx;
1493         u8 *apdu;
1494         size_t apdu_len;
1495
1496         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1497             !info->attrs[NFC_ATTR_SE_INDEX] ||
1498             !info->attrs[NFC_ATTR_SE_APDU])
1499                 return -EINVAL;
1500
1501         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1502         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1503
1504         dev = nfc_get_device(dev_idx);
1505         if (!dev)
1506                 return -ENODEV;
1507
1508         if (!dev->ops || !dev->ops->se_io)
1509                 return -ENOTSUPP;
1510
1511         apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1512         if (apdu_len == 0)
1513                 return -EINVAL;
1514
1515         apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1516         if (!apdu)
1517                 return -EINVAL;
1518
1519         ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1520         if (!ctx)
1521                 return -ENOMEM;
1522
1523         ctx->dev_idx = dev_idx;
1524         ctx->se_idx = se_idx;
1525
1526         return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1527 }
1528
1529 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1530                                struct genl_info *info)
1531 {
1532         struct nfc_dev *dev;
1533         struct nfc_vendor_cmd *cmd;
1534         u32 dev_idx, vid, subcmd;
1535         u8 *data;
1536         size_t data_len;
1537         int i, err;
1538
1539         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1540             !info->attrs[NFC_ATTR_VENDOR_ID] ||
1541             !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1542                 return -EINVAL;
1543
1544         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1545         vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1546         subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1547
1548         dev = nfc_get_device(dev_idx);
1549         if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
1550                 return -ENODEV;
1551
1552         if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1553                 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1554                 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1555                 if (data_len == 0)
1556                         return -EINVAL;
1557         } else {
1558                 data = NULL;
1559                 data_len = 0;
1560         }
1561
1562         for (i = 0; i < dev->n_vendor_cmds; i++) {
1563                 cmd = &dev->vendor_cmds[i];
1564
1565                 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1566                         continue;
1567
1568                 dev->cur_cmd_info = info;
1569                 err = cmd->doit(dev, data, data_len);
1570                 dev->cur_cmd_info = NULL;
1571                 return err;
1572         }
1573
1574         return -EOPNOTSUPP;
1575 }
1576
1577 /* message building helper */
1578 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1579                                 int flags, u8 cmd)
1580 {
1581         /* since there is no private header just add the generic one */
1582         return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1583 }
1584
1585 static struct sk_buff *
1586 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1587                            u32 portid, u32 seq,
1588                            enum nfc_attrs attr,
1589                            u32 oui, u32 subcmd, gfp_t gfp)
1590 {
1591         struct sk_buff *skb;
1592         void *hdr;
1593
1594         skb = nlmsg_new(approxlen + 100, gfp);
1595         if (!skb)
1596                 return NULL;
1597
1598         hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1599         if (!hdr) {
1600                 kfree_skb(skb);
1601                 return NULL;
1602         }
1603
1604         if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1605                 goto nla_put_failure;
1606         if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1607                 goto nla_put_failure;
1608         if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1609                 goto nla_put_failure;
1610
1611         ((void **)skb->cb)[0] = dev;
1612         ((void **)skb->cb)[1] = hdr;
1613
1614         return skb;
1615
1616 nla_put_failure:
1617         kfree_skb(skb);
1618         return NULL;
1619 }
1620
1621 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1622                                                  enum nfc_attrs attr,
1623                                                  u32 oui, u32 subcmd,
1624                                                  int approxlen)
1625 {
1626         if (WARN_ON(!dev->cur_cmd_info))
1627                 return NULL;
1628
1629         return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1630                                           dev->cur_cmd_info->snd_portid,
1631                                           dev->cur_cmd_info->snd_seq, attr,
1632                                           oui, subcmd, GFP_KERNEL);
1633 }
1634 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1635
1636 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1637 {
1638         struct nfc_dev *dev = ((void **)skb->cb)[0];
1639         void *hdr = ((void **)skb->cb)[1];
1640
1641         /* clear CB data for netlink core to own from now on */
1642         memset(skb->cb, 0, sizeof(skb->cb));
1643
1644         if (WARN_ON(!dev->cur_cmd_info)) {
1645                 kfree_skb(skb);
1646                 return -EINVAL;
1647         }
1648
1649         genlmsg_end(skb, hdr);
1650         return genlmsg_reply(skb, dev->cur_cmd_info);
1651 }
1652 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1653
1654 static const struct genl_ops nfc_genl_ops[] = {
1655         {
1656                 .cmd = NFC_CMD_GET_DEVICE,
1657                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1658                 .doit = nfc_genl_get_device,
1659                 .dumpit = nfc_genl_dump_devices,
1660                 .done = nfc_genl_dump_devices_done,
1661         },
1662         {
1663                 .cmd = NFC_CMD_DEV_UP,
1664                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1665                 .doit = nfc_genl_dev_up,
1666         },
1667         {
1668                 .cmd = NFC_CMD_DEV_DOWN,
1669                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1670                 .doit = nfc_genl_dev_down,
1671         },
1672         {
1673                 .cmd = NFC_CMD_START_POLL,
1674                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1675                 .doit = nfc_genl_start_poll,
1676         },
1677         {
1678                 .cmd = NFC_CMD_STOP_POLL,
1679                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1680                 .doit = nfc_genl_stop_poll,
1681         },
1682         {
1683                 .cmd = NFC_CMD_DEP_LINK_UP,
1684                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1685                 .doit = nfc_genl_dep_link_up,
1686         },
1687         {
1688                 .cmd = NFC_CMD_DEP_LINK_DOWN,
1689                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1690                 .doit = nfc_genl_dep_link_down,
1691         },
1692         {
1693                 .cmd = NFC_CMD_GET_TARGET,
1694                 .validate = GENL_DONT_VALIDATE_STRICT |
1695                             GENL_DONT_VALIDATE_DUMP_STRICT,
1696                 .dumpit = nfc_genl_dump_targets,
1697                 .done = nfc_genl_dump_targets_done,
1698         },
1699         {
1700                 .cmd = NFC_CMD_LLC_GET_PARAMS,
1701                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1702                 .doit = nfc_genl_llc_get_params,
1703         },
1704         {
1705                 .cmd = NFC_CMD_LLC_SET_PARAMS,
1706                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1707                 .doit = nfc_genl_llc_set_params,
1708         },
1709         {
1710                 .cmd = NFC_CMD_LLC_SDREQ,
1711                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1712                 .doit = nfc_genl_llc_sdreq,
1713         },
1714         {
1715                 .cmd = NFC_CMD_FW_DOWNLOAD,
1716                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1717                 .doit = nfc_genl_fw_download,
1718         },
1719         {
1720                 .cmd = NFC_CMD_ENABLE_SE,
1721                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1722                 .doit = nfc_genl_enable_se,
1723         },
1724         {
1725                 .cmd = NFC_CMD_DISABLE_SE,
1726                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1727                 .doit = nfc_genl_disable_se,
1728         },
1729         {
1730                 .cmd = NFC_CMD_GET_SE,
1731                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1732                 .dumpit = nfc_genl_dump_ses,
1733                 .done = nfc_genl_dump_ses_done,
1734         },
1735         {
1736                 .cmd = NFC_CMD_SE_IO,
1737                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1738                 .doit = nfc_genl_se_io,
1739         },
1740         {
1741                 .cmd = NFC_CMD_ACTIVATE_TARGET,
1742                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1743                 .doit = nfc_genl_activate_target,
1744         },
1745         {
1746                 .cmd = NFC_CMD_VENDOR,
1747                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1748                 .doit = nfc_genl_vendor_cmd,
1749         },
1750         {
1751                 .cmd = NFC_CMD_DEACTIVATE_TARGET,
1752                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1753                 .doit = nfc_genl_deactivate_target,
1754         },
1755 };
1756
1757 static struct genl_family nfc_genl_family __ro_after_init = {
1758         .hdrsize = 0,
1759         .name = NFC_GENL_NAME,
1760         .version = NFC_GENL_VERSION,
1761         .maxattr = NFC_ATTR_MAX,
1762         .policy = nfc_genl_policy,
1763         .module = THIS_MODULE,
1764         .ops = nfc_genl_ops,
1765         .n_ops = ARRAY_SIZE(nfc_genl_ops),
1766         .mcgrps = nfc_genl_mcgrps,
1767         .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1768 };
1769
1770
1771 struct urelease_work {
1772         struct  work_struct w;
1773         u32     portid;
1774 };
1775
1776 static void nfc_urelease_event_work(struct work_struct *work)
1777 {
1778         struct urelease_work *w = container_of(work, struct urelease_work, w);
1779         struct class_dev_iter iter;
1780         struct nfc_dev *dev;
1781
1782         pr_debug("portid %d\n", w->portid);
1783
1784         mutex_lock(&nfc_devlist_mutex);
1785
1786         nfc_device_iter_init(&iter);
1787         dev = nfc_device_iter_next(&iter);
1788
1789         while (dev) {
1790                 mutex_lock(&dev->genl_data.genl_data_mutex);
1791
1792                 if (dev->genl_data.poll_req_portid == w->portid) {
1793                         nfc_stop_poll(dev);
1794                         dev->genl_data.poll_req_portid = 0;
1795                 }
1796
1797                 mutex_unlock(&dev->genl_data.genl_data_mutex);
1798
1799                 dev = nfc_device_iter_next(&iter);
1800         }
1801
1802         nfc_device_iter_exit(&iter);
1803
1804         mutex_unlock(&nfc_devlist_mutex);
1805
1806         kfree(w);
1807 }
1808
1809 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1810                                  unsigned long event, void *ptr)
1811 {
1812         struct netlink_notify *n = ptr;
1813         struct urelease_work *w;
1814
1815         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1816                 goto out;
1817
1818         pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1819
1820         w = kmalloc(sizeof(*w), GFP_ATOMIC);
1821         if (w) {
1822                 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
1823                 w->portid = n->portid;
1824                 schedule_work((struct work_struct *) w);
1825         }
1826
1827 out:
1828         return NOTIFY_DONE;
1829 }
1830
1831 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1832 {
1833         genl_data->poll_req_portid = 0;
1834         mutex_init(&genl_data->genl_data_mutex);
1835 }
1836
1837 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1838 {
1839         mutex_destroy(&genl_data->genl_data_mutex);
1840 }
1841
1842 static struct notifier_block nl_notifier = {
1843         .notifier_call  = nfc_genl_rcv_nl_event,
1844 };
1845
1846 /**
1847  * nfc_genl_init() - Initialize netlink interface
1848  *
1849  * This initialization function registers the nfc netlink family.
1850  */
1851 int __init nfc_genl_init(void)
1852 {
1853         int rc;
1854
1855         rc = genl_register_family(&nfc_genl_family);
1856         if (rc)
1857                 return rc;
1858
1859         netlink_register_notifier(&nl_notifier);
1860
1861         return 0;
1862 }
1863
1864 /**
1865  * nfc_genl_exit() - Deinitialize netlink interface
1866  *
1867  * This exit function unregisters the nfc netlink family.
1868  */
1869 void nfc_genl_exit(void)
1870 {
1871         netlink_unregister_notifier(&nl_notifier);
1872         genl_unregister_family(&nfc_genl_family);
1873 }