net/nfc/netlink.c

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