net/nfc/netlink.c

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