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_APDU] = { .type = NLA_BINARY },
  59         [NFC_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
  60
  61 };
  62
  63 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
  64         [NFC_SDP_ATTR_URI] = { .type = NLA_STRING },
  65         [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
  66 };
  67
  68 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
  69                                 struct netlink_callback *cb, int flags)
  70 {
  71         void *hdr;
  72
  73         hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  74                           &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
  75         if (!hdr)
  76                 return -EMSGSIZE;
  77
  78         genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
  79
  80         if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
  81             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
  82             nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
  83             nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
  84                 goto nla_put_failure;
  85         if (target->nfcid1_len > 0 &&
  86             nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
  87                     target->nfcid1))
  88                 goto nla_put_failure;
  89         if (target->sensb_res_len > 0 &&
  90             nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
  91                     target->sensb_res))
  92                 goto nla_put_failure;
  93         if (target->sensf_res_len > 0 &&
  94             nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
  95                     target->sensf_res))
  96                 goto nla_put_failure;
  97
  98         if (target->is_iso15693) {
  99                 if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID,
 100                                target->iso15693_dsfid) ||
 101                     nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID,
 102                             sizeof(target->iso15693_uid), target->iso15693_uid))
 103                         goto nla_put_failure;
 104         }
 105
 106         genlmsg_end(msg, hdr);
 107         return 0;
 108
 109 nla_put_failure:
 110         genlmsg_cancel(msg, hdr);
 111         return -EMSGSIZE;
 112 }
 113
 114 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
 115 {
 116         struct nlattr **attrbuf = genl_family_attrbuf(&nfc_genl_family);
 117         struct nfc_dev *dev;
 118         int rc;
 119         u32 idx;
 120
 121         rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
 122                          attrbuf, nfc_genl_family.maxattr, nfc_genl_policy,
 123                          NULL);
 124         if (rc < 0)
 125                 return ERR_PTR(rc);
 126
 127         if (!attrbuf[NFC_ATTR_DEVICE_INDEX])
 128                 return ERR_PTR(-EINVAL);
 129
 130         idx = nla_get_u32(attrbuf[NFC_ATTR_DEVICE_INDEX]);
 131
 132         dev = nfc_get_device(idx);
 133         if (!dev)
 134                 return ERR_PTR(-ENODEV);
 135
 136         return dev;
 137 }
 138
 139 static int nfc_genl_dump_targets(struct sk_buff *skb,
 140                                  struct netlink_callback *cb)
 141 {
 142         int i = cb->args[0];
 143         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 144         int rc;
 145
 146         if (!dev) {
 147                 dev = __get_device_from_cb(cb);
 148                 if (IS_ERR(dev))
 149                         return PTR_ERR(dev);
 150
 151                 cb->args[1] = (long) dev;
 152         }
 153
 154         device_lock(&dev->dev);
 155
 156         cb->seq = dev->targets_generation;
 157
 158         while (i < dev->n_targets) {
 159                 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
 160                                           NLM_F_MULTI);
 161                 if (rc < 0)
 162                         break;
 163
 164                 i++;
 165         }
 166
 167         device_unlock(&dev->dev);
 168
 169         cb->args[0] = i;
 170
 171         return skb->len;
 172 }
 173
 174 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 175 {
 176         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 177
 178         if (dev)
 179                 nfc_put_device(dev);
 180
 181         return 0;
 182 }
 183
 184 int nfc_genl_targets_found(struct nfc_dev *dev)
 185 {
 186         struct sk_buff *msg;
 187         void *hdr;
 188
 189         dev->genl_data.poll_req_portid = 0;
 190
 191         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 192         if (!msg)
 193                 return -ENOMEM;
 194
 195         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 196                           NFC_EVENT_TARGETS_FOUND);
 197         if (!hdr)
 198                 goto free_msg;
 199
 200         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 201                 goto nla_put_failure;
 202
 203         genlmsg_end(msg, hdr);
 204
 205         return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 206
 207 nla_put_failure:
 208         genlmsg_cancel(msg, hdr);
 209 free_msg:
 210         nlmsg_free(msg);
 211         return -EMSGSIZE;
 212 }
 213
 214 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
 215 {
 216         struct sk_buff *msg;
 217         void *hdr;
 218
 219         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 220         if (!msg)
 221                 return -ENOMEM;
 222
 223         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 224                           NFC_EVENT_TARGET_LOST);
 225         if (!hdr)
 226                 goto free_msg;
 227
 228         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 229             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 230                 goto nla_put_failure;
 231
 232         genlmsg_end(msg, hdr);
 233
 234         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 235
 236         return 0;
 237
 238 nla_put_failure:
 239         genlmsg_cancel(msg, hdr);
 240 free_msg:
 241         nlmsg_free(msg);
 242         return -EMSGSIZE;
 243 }
 244
 245 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
 246 {
 247         struct sk_buff *msg;
 248         void *hdr;
 249
 250         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 251         if (!msg)
 252                 return -ENOMEM;
 253
 254         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 255                           NFC_EVENT_TM_ACTIVATED);
 256         if (!hdr)
 257                 goto free_msg;
 258
 259         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 260                 goto nla_put_failure;
 261         if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
 262                 goto nla_put_failure;
 263
 264         genlmsg_end(msg, hdr);
 265
 266         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 267
 268         return 0;
 269
 270 nla_put_failure:
 271         genlmsg_cancel(msg, hdr);
 272 free_msg:
 273         nlmsg_free(msg);
 274         return -EMSGSIZE;
 275 }
 276
 277 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
 278 {
 279         struct sk_buff *msg;
 280         void *hdr;
 281
 282         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 283         if (!msg)
 284                 return -ENOMEM;
 285
 286         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 287                           NFC_EVENT_TM_DEACTIVATED);
 288         if (!hdr)
 289                 goto free_msg;
 290
 291         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 292                 goto nla_put_failure;
 293
 294         genlmsg_end(msg, hdr);
 295
 296         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 297
 298         return 0;
 299
 300 nla_put_failure:
 301         genlmsg_cancel(msg, hdr);
 302 free_msg:
 303         nlmsg_free(msg);
 304         return -EMSGSIZE;
 305 }
 306
 307 static int nfc_genl_setup_device_added(struct nfc_dev *dev, struct sk_buff *msg)
 308 {
 309         if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 310             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 311             nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 312             nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
 313             nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
 314                 return -1;
 315         return 0;
 316 }
 317
 318 int nfc_genl_device_added(struct nfc_dev *dev)
 319 {
 320         struct sk_buff *msg;
 321         void *hdr;
 322
 323         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 324         if (!msg)
 325                 return -ENOMEM;
 326
 327         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 328                           NFC_EVENT_DEVICE_ADDED);
 329         if (!hdr)
 330                 goto free_msg;
 331
 332         if (nfc_genl_setup_device_added(dev, msg))
 333                 goto nla_put_failure;
 334
 335         genlmsg_end(msg, hdr);
 336
 337         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 338
 339         return 0;
 340
 341 nla_put_failure:
 342         genlmsg_cancel(msg, hdr);
 343 free_msg:
 344         nlmsg_free(msg);
 345         return -EMSGSIZE;
 346 }
 347
 348 int nfc_genl_device_removed(struct nfc_dev *dev)
 349 {
 350         struct sk_buff *msg;
 351         void *hdr;
 352
 353         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 354         if (!msg)
 355                 return -ENOMEM;
 356
 357         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 358                           NFC_EVENT_DEVICE_REMOVED);
 359         if (!hdr)
 360                 goto free_msg;
 361
 362         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 363                 goto nla_put_failure;
 364
 365         genlmsg_end(msg, hdr);
 366
 367         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 368
 369         return 0;
 370
 371 nla_put_failure:
 372         genlmsg_cancel(msg, hdr);
 373 free_msg:
 374         nlmsg_free(msg);
 375         return -EMSGSIZE;
 376 }
 377
 378 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
 379 {
 380         struct sk_buff *msg;
 381         struct nlattr *sdp_attr, *uri_attr;
 382         struct nfc_llcp_sdp_tlv *sdres;
 383         struct hlist_node *n;
 384         void *hdr;
 385         int rc = -EMSGSIZE;
 386         int i;
 387
 388         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 389         if (!msg)
 390                 return -ENOMEM;
 391
 392         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 393                           NFC_EVENT_LLC_SDRES);
 394         if (!hdr)
 395                 goto free_msg;
 396
 397         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 398                 goto nla_put_failure;
 399
 400         sdp_attr = nla_nest_start(msg, NFC_ATTR_LLC_SDP);
 401         if (sdp_attr == NULL) {
 402                 rc = -ENOMEM;
 403                 goto nla_put_failure;
 404         }
 405
 406         i = 1;
 407         hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
 408                 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
 409
 410                 uri_attr = nla_nest_start(msg, i++);
 411                 if (uri_attr == NULL) {
 412                         rc = -ENOMEM;
 413                         goto nla_put_failure;
 414                 }
 415
 416                 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
 417                         goto nla_put_failure;
 418
 419                 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
 420                         goto nla_put_failure;
 421
 422                 nla_nest_end(msg, uri_attr);
 423
 424                 hlist_del(&sdres->node);
 425
 426                 nfc_llcp_free_sdp_tlv(sdres);
 427         }
 428
 429         nla_nest_end(msg, sdp_attr);
 430
 431         genlmsg_end(msg, hdr);
 432
 433         return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 434
 435 nla_put_failure:
 436         genlmsg_cancel(msg, hdr);
 437
 438 free_msg:
 439         nlmsg_free(msg);
 440
 441         nfc_llcp_free_sdp_tlv_list(sdres_list);
 442
 443         return rc;
 444 }
 445
 446 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
 447 {
 448         struct sk_buff *msg;
 449         void *hdr;
 450
 451         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 452         if (!msg)
 453                 return -ENOMEM;
 454
 455         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 456                           NFC_EVENT_SE_ADDED);
 457         if (!hdr)
 458                 goto free_msg;
 459
 460         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 461             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 462             nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
 463                 goto nla_put_failure;
 464
 465         genlmsg_end(msg, hdr);
 466
 467         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 468
 469         return 0;
 470
 471 nla_put_failure:
 472         genlmsg_cancel(msg, hdr);
 473 free_msg:
 474         nlmsg_free(msg);
 475         return -EMSGSIZE;
 476 }
 477
 478 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
 479 {
 480         struct sk_buff *msg;
 481         void *hdr;
 482
 483         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 484         if (!msg)
 485                 return -ENOMEM;
 486
 487         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 488                           NFC_EVENT_SE_REMOVED);
 489         if (!hdr)
 490                 goto free_msg;
 491
 492         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 493             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
 494                 goto nla_put_failure;
 495
 496         genlmsg_end(msg, hdr);
 497
 498         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 499
 500         return 0;
 501
 502 nla_put_failure:
 503         genlmsg_cancel(msg, hdr);
 504 free_msg:
 505         nlmsg_free(msg);
 506         return -EMSGSIZE;
 507 }
 508
 509 int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
 510                             struct nfc_evt_transaction *evt_transaction)
 511 {
 512         struct nfc_se *se;
 513         struct sk_buff *msg;
 514         void *hdr;
 515
 516         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 517         if (!msg)
 518                 return -ENOMEM;
 519
 520         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 521                           NFC_EVENT_SE_TRANSACTION);
 522         if (!hdr)
 523                 goto free_msg;
 524
 525         se = nfc_find_se(dev, se_idx);
 526         if (!se)
 527                 goto free_msg;
 528
 529         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 530             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 531             nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||
 532             nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,
 533                     evt_transaction->aid) ||
 534             nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,
 535                     evt_transaction->params))
 536                 goto nla_put_failure;
 537
 538         /* evt_transaction is no more used */
 539         devm_kfree(&dev->dev, evt_transaction);
 540
 541         genlmsg_end(msg, hdr);
 542
 543         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 544
 545         return 0;
 546
 547 nla_put_failure:
 548         genlmsg_cancel(msg, hdr);
 549 free_msg:
 550         /* evt_transaction is no more used */
 551         devm_kfree(&dev->dev, evt_transaction);
 552         nlmsg_free(msg);
 553         return -EMSGSIZE;
 554 }
 555
 556 int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
 557 {
 558         struct nfc_se *se;
 559         struct sk_buff *msg;
 560         void *hdr;
 561
 562         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 563         if (!msg)
 564                 return -ENOMEM;
 565
 566         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 567                           NFC_EVENT_SE_CONNECTIVITY);
 568         if (!hdr)
 569                 goto free_msg;
 570
 571         se = nfc_find_se(dev, se_idx);
 572         if (!se)
 573                 goto free_msg;
 574
 575         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 576             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 577             nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
 578                 goto nla_put_failure;
 579
 580         genlmsg_end(msg, hdr);
 581
 582         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 583
 584         return 0;
 585
 586 nla_put_failure:
 587         genlmsg_cancel(msg, hdr);
 588 free_msg:
 589         nlmsg_free(msg);
 590         return -EMSGSIZE;
 591 }
 592
 593 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 594                                 u32 portid, u32 seq,
 595                                 struct netlink_callback *cb,
 596                                 int flags)
 597 {
 598         void *hdr;
 599
 600         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
 601                           NFC_CMD_GET_DEVICE);
 602         if (!hdr)
 603                 return -EMSGSIZE;
 604
 605         if (cb)
 606                 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
 607
 608         if (nfc_genl_setup_device_added(dev, msg))
 609                 goto nla_put_failure;
 610
 611         genlmsg_end(msg, hdr);
 612         return 0;
 613
 614 nla_put_failure:
 615         genlmsg_cancel(msg, hdr);
 616         return -EMSGSIZE;
 617 }
 618
 619 static int nfc_genl_dump_devices(struct sk_buff *skb,
 620                                  struct netlink_callback *cb)
 621 {
 622         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 623         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 624         bool first_call = false;
 625
 626         if (!iter) {
 627                 first_call = true;
 628                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 629                 if (!iter)
 630                         return -ENOMEM;
 631                 cb->args[0] = (long) iter;
 632         }
 633
 634         mutex_lock(&nfc_devlist_mutex);
 635
 636         cb->seq = nfc_devlist_generation;
 637
 638         if (first_call) {
 639                 nfc_device_iter_init(iter);
 640                 dev = nfc_device_iter_next(iter);
 641         }
 642
 643         while (dev) {
 644                 int rc;
 645
 646                 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
 647                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
 648                 if (rc < 0)
 649                         break;
 650
 651                 dev = nfc_device_iter_next(iter);
 652         }
 653
 654         mutex_unlock(&nfc_devlist_mutex);
 655
 656         cb->args[1] = (long) dev;
 657
 658         return skb->len;
 659 }
 660
 661 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 662 {
 663         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 664
 665         nfc_device_iter_exit(iter);
 666         kfree(iter);
 667
 668         return 0;
 669 }
 670
 671 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 672                                u8 comm_mode, u8 rf_mode)
 673 {
 674         struct sk_buff *msg;
 675         void *hdr;
 676
 677         pr_debug("DEP link is up\n");
 678
 679         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 680         if (!msg)
 681                 return -ENOMEM;
 682
 683         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
 684         if (!hdr)
 685                 goto free_msg;
 686
 687         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 688                 goto nla_put_failure;
 689         if (rf_mode == NFC_RF_INITIATOR &&
 690             nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 691                 goto nla_put_failure;
 692         if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
 693             nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
 694                 goto nla_put_failure;
 695
 696         genlmsg_end(msg, hdr);
 697
 698         dev->dep_link_up = true;
 699
 700         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 701
 702         return 0;
 703
 704 nla_put_failure:
 705         genlmsg_cancel(msg, hdr);
 706 free_msg:
 707         nlmsg_free(msg);
 708         return -EMSGSIZE;
 709 }
 710
 711 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 712 {
 713         struct sk_buff *msg;
 714         void *hdr;
 715
 716         pr_debug("DEP link is down\n");
 717
 718         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 719         if (!msg)
 720                 return -ENOMEM;
 721
 722         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 723                           NFC_CMD_DEP_LINK_DOWN);
 724         if (!hdr)
 725                 goto free_msg;
 726
 727         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 728                 goto nla_put_failure;
 729
 730         genlmsg_end(msg, hdr);
 731
 732         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 733
 734         return 0;
 735
 736 nla_put_failure:
 737         genlmsg_cancel(msg, hdr);
 738 free_msg:
 739         nlmsg_free(msg);
 740         return -EMSGSIZE;
 741 }
 742
 743 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 744 {
 745         struct sk_buff *msg;
 746         struct nfc_dev *dev;
 747         u32 idx;
 748         int rc = -ENOBUFS;
 749
 750         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 751                 return -EINVAL;
 752
 753         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 754
 755         dev = nfc_get_device(idx);
 756         if (!dev)
 757                 return -ENODEV;
 758
 759         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 760         if (!msg) {
 761                 rc = -ENOMEM;
 762                 goto out_putdev;
 763         }
 764
 765         rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
 766                                   NULL, 0);
 767         if (rc < 0)
 768                 goto out_free;
 769
 770         nfc_put_device(dev);
 771
 772         return genlmsg_reply(msg, info);
 773
 774 out_free:
 775         nlmsg_free(msg);
 776 out_putdev:
 777         nfc_put_device(dev);
 778         return rc;
 779 }
 780
 781 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 782 {
 783         struct nfc_dev *dev;
 784         int rc;
 785         u32 idx;
 786
 787         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 788                 return -EINVAL;
 789
 790         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 791
 792         dev = nfc_get_device(idx);
 793         if (!dev)
 794                 return -ENODEV;
 795
 796         rc = nfc_dev_up(dev);
 797
 798         nfc_put_device(dev);
 799         return rc;
 800 }
 801
 802 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 803 {
 804         struct nfc_dev *dev;
 805         int rc;
 806         u32 idx;
 807
 808         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 809                 return -EINVAL;
 810
 811         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 812
 813         dev = nfc_get_device(idx);
 814         if (!dev)
 815                 return -ENODEV;
 816
 817         rc = nfc_dev_down(dev);
 818
 819         nfc_put_device(dev);
 820         return rc;
 821 }
 822
 823 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 824 {
 825         struct nfc_dev *dev;
 826         int rc;
 827         u32 idx;
 828         u32 im_protocols = 0, tm_protocols = 0;
 829
 830         pr_debug("Poll start\n");
 831
 832         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 833             ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
 834               !info->attrs[NFC_ATTR_PROTOCOLS]) &&
 835               !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
 836                 return -EINVAL;
 837
 838         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 839
 840         if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
 841                 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
 842
 843         if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
 844                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
 845         else if (info->attrs[NFC_ATTR_PROTOCOLS])
 846                 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 847
 848         dev = nfc_get_device(idx);
 849         if (!dev)
 850                 return -ENODEV;
 851
 852         mutex_lock(&dev->genl_data.genl_data_mutex);
 853
 854         rc = nfc_start_poll(dev, im_protocols, tm_protocols);
 855         if (!rc)
 856                 dev->genl_data.poll_req_portid = info->snd_portid;
 857
 858         mutex_unlock(&dev->genl_data.genl_data_mutex);
 859
 860         nfc_put_device(dev);
 861         return rc;
 862 }
 863
 864 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 865 {
 866         struct nfc_dev *dev;
 867         int rc;
 868         u32 idx;
 869
 870         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 871                 return -EINVAL;
 872
 873         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 874
 875         dev = nfc_get_device(idx);
 876         if (!dev)
 877                 return -ENODEV;
 878
 879         device_lock(&dev->dev);
 880
 881         if (!dev->polling) {
 882                 device_unlock(&dev->dev);
 883                 return -EINVAL;
 884         }
 885
 886         device_unlock(&dev->dev);
 887
 888         mutex_lock(&dev->genl_data.genl_data_mutex);
 889
 890         if (dev->genl_data.poll_req_portid != info->snd_portid) {
 891                 rc = -EBUSY;
 892                 goto out;
 893         }
 894
 895         rc = nfc_stop_poll(dev);
 896         dev->genl_data.poll_req_portid = 0;
 897
 898 out:
 899         mutex_unlock(&dev->genl_data.genl_data_mutex);
 900         nfc_put_device(dev);
 901         return rc;
 902 }
 903
 904 static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
 905 {
 906         struct nfc_dev *dev;
 907         u32 device_idx, target_idx, protocol;
 908         int rc;
 909
 910         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 911             !info->attrs[NFC_ATTR_TARGET_INDEX] ||
 912             !info->attrs[NFC_ATTR_PROTOCOLS])
 913                 return -EINVAL;
 914
 915         device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 916
 917         dev = nfc_get_device(device_idx);
 918         if (!dev)
 919                 return -ENODEV;
 920
 921         target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 922         protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 923
 924         nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 925         rc = nfc_activate_target(dev, target_idx, protocol);
 926
 927         nfc_put_device(dev);
 928         return rc;
 929 }
 930
 931 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 932 {
 933         struct nfc_dev *dev;
 934         int rc, tgt_idx;
 935         u32 idx;
 936         u8 comm;
 937
 938         pr_debug("DEP link up\n");
 939
 940         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 941             !info->attrs[NFC_ATTR_COMM_MODE])
 942                 return -EINVAL;
 943
 944         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 945         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 946                 tgt_idx = NFC_TARGET_IDX_ANY;
 947         else
 948                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 949
 950         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 951
 952         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 953                 return -EINVAL;
 954
 955         dev = nfc_get_device(idx);
 956         if (!dev)
 957                 return -ENODEV;
 958
 959         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 960
 961         nfc_put_device(dev);
 962
 963         return rc;
 964 }
 965
 966 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 967 {
 968         struct nfc_dev *dev;
 969         int rc;
 970         u32 idx;
 971
 972         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 973                 return -EINVAL;
 974
 975         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 976
 977         dev = nfc_get_device(idx);
 978         if (!dev)
 979                 return -ENODEV;
 980
 981         rc = nfc_dep_link_down(dev);
 982
 983         nfc_put_device(dev);
 984         return rc;
 985 }
 986
 987 static int nfc_genl_send_params(struct sk_buff *msg,
 988                                 struct nfc_llcp_local *local,
 989                                 u32 portid, u32 seq)
 990 {
 991         void *hdr;
 992
 993         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
 994                           NFC_CMD_LLC_GET_PARAMS);
 995         if (!hdr)
 996                 return -EMSGSIZE;
 997
 998         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
 999             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
1000             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1001             nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1002                 goto nla_put_failure;
1003
1004         genlmsg_end(msg, hdr);
1005         return 0;
1006
1007 nla_put_failure:
1008
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(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
1171                                       nfc_sdp_genl_policy, info->extack);
1172
1173                 if (rc != 0) {
1174                         rc = -EINVAL;
1175                         goto exit;
1176                 }
1177
1178                 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1179                         continue;
1180
1181                 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1182                 if (uri_len == 0)
1183                         continue;
1184
1185                 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1186                 if (uri == NULL || *uri == 0)
1187                         continue;
1188
1189                 tid = local->sdreq_next_tid++;
1190
1191                 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1192                 if (sdreq == NULL) {
1193                         rc = -ENOMEM;
1194                         goto exit;
1195                 }
1196
1197                 tlvs_len += sdreq->tlv_len;
1198
1199                 hlist_add_head(&sdreq->node, &sdreq_list);
1200         }
1201
1202         if (hlist_empty(&sdreq_list)) {
1203                 rc = -EINVAL;
1204                 goto exit;
1205         }
1206
1207         rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1208 exit:
1209         device_unlock(&dev->dev);
1210
1211         nfc_put_device(dev);
1212
1213         return rc;
1214 }
1215
1216 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1217 {
1218         struct nfc_dev *dev;
1219         int rc;
1220         u32 idx;
1221         char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1222
1223         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1224                 return -EINVAL;
1225
1226         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1227
1228         dev = nfc_get_device(idx);
1229         if (!dev)
1230                 return -ENODEV;
1231
1232         nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1233                     sizeof(firmware_name));
1234
1235         rc = nfc_fw_download(dev, firmware_name);
1236
1237         nfc_put_device(dev);
1238         return rc;
1239 }
1240
1241 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1242                               u32 result)
1243 {
1244         struct sk_buff *msg;
1245         void *hdr;
1246
1247         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1248         if (!msg)
1249                 return -ENOMEM;
1250
1251         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1252                           NFC_CMD_FW_DOWNLOAD);
1253         if (!hdr)
1254                 goto free_msg;
1255
1256         if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1257             nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1258             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1259                 goto nla_put_failure;
1260
1261         genlmsg_end(msg, hdr);
1262
1263         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1264
1265         return 0;
1266
1267 nla_put_failure:
1268         genlmsg_cancel(msg, hdr);
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, &nfc_genl_family);
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         genlmsg_cancel(msg, hdr);
1486 free_msg:
1487         nlmsg_free(msg);
1488         kfree(ctx);
1489
1490         return;
1491 }
1492
1493 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1494 {
1495         struct nfc_dev *dev;
1496         struct se_io_ctx *ctx;
1497         u32 dev_idx, se_idx;
1498         u8 *apdu;
1499         size_t apdu_len;
1500
1501         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1502             !info->attrs[NFC_ATTR_SE_INDEX] ||
1503             !info->attrs[NFC_ATTR_SE_APDU])
1504                 return -EINVAL;
1505
1506         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1507         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1508
1509         dev = nfc_get_device(dev_idx);
1510         if (!dev)
1511                 return -ENODEV;
1512
1513         if (!dev->ops || !dev->ops->se_io)
1514                 return -ENOTSUPP;
1515
1516         apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1517         if (apdu_len == 0)
1518                 return -EINVAL;
1519
1520         apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1521         if (!apdu)
1522                 return -EINVAL;
1523
1524         ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1525         if (!ctx)
1526                 return -ENOMEM;
1527
1528         ctx->dev_idx = dev_idx;
1529         ctx->se_idx = se_idx;
1530
1531         return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1532 }
1533
1534 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1535                                struct genl_info *info)
1536 {
1537         struct nfc_dev *dev;
1538         struct nfc_vendor_cmd *cmd;
1539         u32 dev_idx, vid, subcmd;
1540         u8 *data;
1541         size_t data_len;
1542         int i, err;
1543
1544         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1545             !info->attrs[NFC_ATTR_VENDOR_ID] ||
1546             !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1547                 return -EINVAL;
1548
1549         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1550         vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1551         subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1552
1553         dev = nfc_get_device(dev_idx);
1554         if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
1555                 return -ENODEV;
1556
1557         if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1558                 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1559                 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1560                 if (data_len == 0)
1561                         return -EINVAL;
1562         } else {
1563                 data = NULL;
1564                 data_len = 0;
1565         }
1566
1567         for (i = 0; i < dev->n_vendor_cmds; i++) {
1568                 cmd = &dev->vendor_cmds[i];
1569
1570                 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1571                         continue;
1572
1573                 dev->cur_cmd_info = info;
1574                 err = cmd->doit(dev, data, data_len);
1575                 dev->cur_cmd_info = NULL;
1576                 return err;
1577         }
1578
1579         return -EOPNOTSUPP;
1580 }
1581
1582 /* message building helper */
1583 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1584                                 int flags, u8 cmd)
1585 {
1586         /* since there is no private header just add the generic one */
1587         return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1588 }
1589
1590 static struct sk_buff *
1591 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1592                            u32 portid, u32 seq,
1593                            enum nfc_attrs attr,
1594                            u32 oui, u32 subcmd, gfp_t gfp)
1595 {
1596         struct sk_buff *skb;
1597         void *hdr;
1598
1599         skb = nlmsg_new(approxlen + 100, gfp);
1600         if (!skb)
1601                 return NULL;
1602
1603         hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1604         if (!hdr) {
1605                 kfree_skb(skb);
1606                 return NULL;
1607         }
1608
1609         if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1610                 goto nla_put_failure;
1611         if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1612                 goto nla_put_failure;
1613         if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1614                 goto nla_put_failure;
1615
1616         ((void **)skb->cb)[0] = dev;
1617         ((void **)skb->cb)[1] = hdr;
1618
1619         return skb;
1620
1621 nla_put_failure:
1622         kfree_skb(skb);
1623         return NULL;
1624 }
1625
1626 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1627                                                  enum nfc_attrs attr,
1628                                                  u32 oui, u32 subcmd,
1629                                                  int approxlen)
1630 {
1631         if (WARN_ON(!dev->cur_cmd_info))
1632                 return NULL;
1633
1634         return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1635                                           dev->cur_cmd_info->snd_portid,
1636                                           dev->cur_cmd_info->snd_seq, attr,
1637                                           oui, subcmd, GFP_KERNEL);
1638 }
1639 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1640
1641 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1642 {
1643         struct nfc_dev *dev = ((void **)skb->cb)[0];
1644         void *hdr = ((void **)skb->cb)[1];
1645
1646         /* clear CB data for netlink core to own from now on */
1647         memset(skb->cb, 0, sizeof(skb->cb));
1648
1649         if (WARN_ON(!dev->cur_cmd_info)) {
1650                 kfree_skb(skb);
1651                 return -EINVAL;
1652         }
1653
1654         genlmsg_end(skb, hdr);
1655         return genlmsg_reply(skb, dev->cur_cmd_info);
1656 }
1657 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1658
1659 static const struct genl_ops nfc_genl_ops[] = {
1660         {
1661                 .cmd = NFC_CMD_GET_DEVICE,
1662                 .doit = nfc_genl_get_device,
1663                 .dumpit = nfc_genl_dump_devices,
1664                 .done = nfc_genl_dump_devices_done,
1665                 .policy = nfc_genl_policy,
1666         },
1667         {
1668                 .cmd = NFC_CMD_DEV_UP,
1669                 .doit = nfc_genl_dev_up,
1670                 .policy = nfc_genl_policy,
1671         },
1672         {
1673                 .cmd = NFC_CMD_DEV_DOWN,
1674                 .doit = nfc_genl_dev_down,
1675                 .policy = nfc_genl_policy,
1676         },
1677         {
1678                 .cmd = NFC_CMD_START_POLL,
1679                 .doit = nfc_genl_start_poll,
1680                 .policy = nfc_genl_policy,
1681         },
1682         {
1683                 .cmd = NFC_CMD_STOP_POLL,
1684                 .doit = nfc_genl_stop_poll,
1685                 .policy = nfc_genl_policy,
1686         },
1687         {
1688                 .cmd = NFC_CMD_DEP_LINK_UP,
1689                 .doit = nfc_genl_dep_link_up,
1690                 .policy = nfc_genl_policy,
1691         },
1692         {
1693                 .cmd = NFC_CMD_DEP_LINK_DOWN,
1694                 .doit = nfc_genl_dep_link_down,
1695                 .policy = nfc_genl_policy,
1696         },
1697         {
1698                 .cmd = NFC_CMD_GET_TARGET,
1699                 .dumpit = nfc_genl_dump_targets,
1700                 .done = nfc_genl_dump_targets_done,
1701                 .policy = nfc_genl_policy,
1702         },
1703         {
1704                 .cmd = NFC_CMD_LLC_GET_PARAMS,
1705                 .doit = nfc_genl_llc_get_params,
1706                 .policy = nfc_genl_policy,
1707         },
1708         {
1709                 .cmd = NFC_CMD_LLC_SET_PARAMS,
1710                 .doit = nfc_genl_llc_set_params,
1711                 .policy = nfc_genl_policy,
1712         },
1713         {
1714                 .cmd = NFC_CMD_LLC_SDREQ,
1715                 .doit = nfc_genl_llc_sdreq,
1716                 .policy = nfc_genl_policy,
1717         },
1718         {
1719                 .cmd = NFC_CMD_FW_DOWNLOAD,
1720                 .doit = nfc_genl_fw_download,
1721                 .policy = nfc_genl_policy,
1722         },
1723         {
1724                 .cmd = NFC_CMD_ENABLE_SE,
1725                 .doit = nfc_genl_enable_se,
1726                 .policy = nfc_genl_policy,
1727         },
1728         {
1729                 .cmd = NFC_CMD_DISABLE_SE,
1730                 .doit = nfc_genl_disable_se,
1731                 .policy = nfc_genl_policy,
1732         },
1733         {
1734                 .cmd = NFC_CMD_GET_SE,
1735                 .dumpit = nfc_genl_dump_ses,
1736                 .done = nfc_genl_dump_ses_done,
1737                 .policy = nfc_genl_policy,
1738         },
1739         {
1740                 .cmd = NFC_CMD_SE_IO,
1741                 .doit = nfc_genl_se_io,
1742                 .policy = nfc_genl_policy,
1743         },
1744         {
1745                 .cmd = NFC_CMD_ACTIVATE_TARGET,
1746                 .doit = nfc_genl_activate_target,
1747                 .policy = nfc_genl_policy,
1748         },
1749         {
1750                 .cmd = NFC_CMD_VENDOR,
1751                 .doit = nfc_genl_vendor_cmd,
1752                 .policy = nfc_genl_policy,
1753         },
1754 };
1755
1756 static struct genl_family nfc_genl_family __ro_after_init = {
1757         .hdrsize = 0,
1758         .name = NFC_GENL_NAME,
1759         .version = NFC_GENL_VERSION,
1760         .maxattr = NFC_ATTR_MAX,
1761         .module = THIS_MODULE,
1762         .ops = nfc_genl_ops,
1763         .n_ops = ARRAY_SIZE(nfc_genl_ops),
1764         .mcgrps = nfc_genl_mcgrps,
1765         .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1766 };
1767
1768
1769 struct urelease_work {
1770         struct  work_struct w;
1771         u32     portid;
1772 };
1773
1774 static void nfc_urelease_event_work(struct work_struct *work)
1775 {
1776         struct urelease_work *w = container_of(work, struct urelease_work, w);
1777         struct class_dev_iter iter;
1778         struct nfc_dev *dev;
1779
1780         pr_debug("portid %d\n", w->portid);
1781
1782         mutex_lock(&nfc_devlist_mutex);
1783
1784         nfc_device_iter_init(&iter);
1785         dev = nfc_device_iter_next(&iter);
1786
1787         while (dev) {
1788                 mutex_lock(&dev->genl_data.genl_data_mutex);
1789
1790                 if (dev->genl_data.poll_req_portid == w->portid) {
1791                         nfc_stop_poll(dev);
1792                         dev->genl_data.poll_req_portid = 0;
1793                 }
1794
1795                 mutex_unlock(&dev->genl_data.genl_data_mutex);
1796
1797                 dev = nfc_device_iter_next(&iter);
1798         }
1799
1800         nfc_device_iter_exit(&iter);
1801
1802         mutex_unlock(&nfc_devlist_mutex);
1803
1804         kfree(w);
1805 }
1806
1807 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1808                                  unsigned long event, void *ptr)
1809 {
1810         struct netlink_notify *n = ptr;
1811         struct urelease_work *w;
1812
1813         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1814                 goto out;
1815
1816         pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1817
1818         w = kmalloc(sizeof(*w), GFP_ATOMIC);
1819         if (w) {
1820                 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
1821                 w->portid = n->portid;
1822                 schedule_work((struct work_struct *) w);
1823         }
1824
1825 out:
1826         return NOTIFY_DONE;
1827 }
1828
1829 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1830 {
1831         genl_data->poll_req_portid = 0;
1832         mutex_init(&genl_data->genl_data_mutex);
1833 }
1834
1835 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1836 {
1837         mutex_destroy(&genl_data->genl_data_mutex);
1838 }
1839
1840 static struct notifier_block nl_notifier = {
1841         .notifier_call  = nfc_genl_rcv_nl_event,
1842 };
1843
1844 /**
1845  * nfc_genl_init() - Initialize netlink interface
1846  *
1847  * This initialization function registers the nfc netlink family.
1848  */
1849 int __init nfc_genl_init(void)
1850 {
1851         int rc;
1852
1853         rc = genl_register_family(&nfc_genl_family);
1854         if (rc)
1855                 return rc;
1856
1857         netlink_register_notifier(&nl_notifier);
1858
1859         return 0;
1860 }
1861
1862 /**
1863  * nfc_genl_exit() - Deinitialize netlink interface
1864  *
1865  * This exit function unregisters the nfc netlink family.
1866  */
1867 void nfc_genl_exit(void)
1868 {
1869         netlink_unregister_notifier(&nl_notifier);
1870         genl_unregister_family(&nfc_genl_family);
1871 }