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