net/nfc/netlink.c

   1 /*
   2  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   3  *
   4  * Authors:
   5  *    Lauro Ramos Venancio <[email protected]>
   6  *    Aloisio Almeida Jr <[email protected]>
   7  *
   8  * Vendor commands implementation based on net/wireless/nl80211.c
   9  * which is:
  10  *
  11  * Copyright 2006-2010  Johannes Berg <[email protected]>
  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);
  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);
 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_deactivate_target(struct sk_buff *skb,
 932                                       struct genl_info *info)
 933 {
 934         struct nfc_dev *dev;
 935         u32 device_idx, target_idx;
 936         int rc;
 937
 938         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 939                 return -EINVAL;
 940
 941         device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 942
 943         dev = nfc_get_device(device_idx);
 944         if (!dev)
 945                 return -ENODEV;
 946
 947         target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 948
 949         rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 950
 951         nfc_put_device(dev);
 952         return rc;
 953 }
 954
 955 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 956 {
 957         struct nfc_dev *dev;
 958         int rc, tgt_idx;
 959         u32 idx;
 960         u8 comm;
 961
 962         pr_debug("DEP link up\n");
 963
 964         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 965             !info->attrs[NFC_ATTR_COMM_MODE])
 966                 return -EINVAL;
 967
 968         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 969         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 970                 tgt_idx = NFC_TARGET_IDX_ANY;
 971         else
 972                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 973
 974         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 975
 976         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 977                 return -EINVAL;
 978
 979         dev = nfc_get_device(idx);
 980         if (!dev)
 981                 return -ENODEV;
 982
 983         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 984
 985         nfc_put_device(dev);
 986
 987         return rc;
 988 }
 989
 990 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 991 {
 992         struct nfc_dev *dev;
 993         int rc;
 994         u32 idx;
 995
 996         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 997                 return -EINVAL;
 998
 999         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1000
1001         dev = nfc_get_device(idx);
1002         if (!dev)
1003                 return -ENODEV;
1004
1005         rc = nfc_dep_link_down(dev);
1006
1007         nfc_put_device(dev);
1008         return rc;
1009 }
1010
1011 static int nfc_genl_send_params(struct sk_buff *msg,
1012                                 struct nfc_llcp_local *local,
1013                                 u32 portid, u32 seq)
1014 {
1015         void *hdr;
1016
1017         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
1018                           NFC_CMD_LLC_GET_PARAMS);
1019         if (!hdr)
1020                 return -EMSGSIZE;
1021
1022         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
1023             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
1024             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1025             nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1026                 goto nla_put_failure;
1027
1028         genlmsg_end(msg, hdr);
1029         return 0;
1030
1031 nla_put_failure:
1032
1033         genlmsg_cancel(msg, hdr);
1034         return -EMSGSIZE;
1035 }
1036
1037 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1038 {
1039         struct nfc_dev *dev;
1040         struct nfc_llcp_local *local;
1041         int rc = 0;
1042         struct sk_buff *msg = NULL;
1043         u32 idx;
1044
1045         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1046                 return -EINVAL;
1047
1048         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1049
1050         dev = nfc_get_device(idx);
1051         if (!dev)
1052                 return -ENODEV;
1053
1054         device_lock(&dev->dev);
1055
1056         local = nfc_llcp_find_local(dev);
1057         if (!local) {
1058                 rc = -ENODEV;
1059                 goto exit;
1060         }
1061
1062         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1063         if (!msg) {
1064                 rc = -ENOMEM;
1065                 goto exit;
1066         }
1067
1068         rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1069
1070 exit:
1071         device_unlock(&dev->dev);
1072
1073         nfc_put_device(dev);
1074
1075         if (rc < 0) {
1076                 if (msg)
1077                         nlmsg_free(msg);
1078
1079                 return rc;
1080         }
1081
1082         return genlmsg_reply(msg, info);
1083 }
1084
1085 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1086 {
1087         struct nfc_dev *dev;
1088         struct nfc_llcp_local *local;
1089         u8 rw = 0;
1090         u16 miux = 0;
1091         u32 idx;
1092         int rc = 0;
1093
1094         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1095             (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1096              !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1097              !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1098                 return -EINVAL;
1099
1100         if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1101                 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1102
1103                 if (rw > LLCP_MAX_RW)
1104                         return -EINVAL;
1105         }
1106
1107         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1108                 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1109
1110                 if (miux > LLCP_MAX_MIUX)
1111                         return -EINVAL;
1112         }
1113
1114         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1115
1116         dev = nfc_get_device(idx);
1117         if (!dev)
1118                 return -ENODEV;
1119
1120         device_lock(&dev->dev);
1121
1122         local = nfc_llcp_find_local(dev);
1123         if (!local) {
1124                 nfc_put_device(dev);
1125                 rc = -ENODEV;
1126                 goto exit;
1127         }
1128
1129         if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1130                 if (dev->dep_link_up) {
1131                         rc = -EINPROGRESS;
1132                         goto exit;
1133                 }
1134
1135                 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1136         }
1137
1138         if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1139                 local->rw = rw;
1140
1141         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1142                 local->miux = cpu_to_be16(miux);
1143
1144 exit:
1145         device_unlock(&dev->dev);
1146
1147         nfc_put_device(dev);
1148
1149         return rc;
1150 }
1151
1152 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1153 {
1154         struct nfc_dev *dev;
1155         struct nfc_llcp_local *local;
1156         struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1157         u32 idx;
1158         u8 tid;
1159         char *uri;
1160         int rc = 0, rem;
1161         size_t uri_len, tlvs_len;
1162         struct hlist_head sdreq_list;
1163         struct nfc_llcp_sdp_tlv *sdreq;
1164
1165         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1166             !info->attrs[NFC_ATTR_LLC_SDP])
1167                 return -EINVAL;
1168
1169         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1170
1171         dev = nfc_get_device(idx);
1172         if (!dev)
1173                 return -ENODEV;
1174
1175         device_lock(&dev->dev);
1176
1177         if (dev->dep_link_up == false) {
1178                 rc = -ENOLINK;
1179                 goto exit;
1180         }
1181
1182         local = nfc_llcp_find_local(dev);
1183         if (!local) {
1184                 nfc_put_device(dev);
1185                 rc = -ENODEV;
1186                 goto exit;
1187         }
1188
1189         INIT_HLIST_HEAD(&sdreq_list);
1190
1191         tlvs_len = 0;
1192
1193         nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1194                 rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
1195                                       nfc_sdp_genl_policy, info->extack);
1196
1197                 if (rc != 0) {
1198                         rc = -EINVAL;
1199                         goto exit;
1200                 }
1201
1202                 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1203                         continue;
1204
1205                 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1206                 if (uri_len == 0)
1207                         continue;
1208
1209                 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1210                 if (uri == NULL || *uri == 0)
1211                         continue;
1212
1213                 tid = local->sdreq_next_tid++;
1214
1215                 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1216                 if (sdreq == NULL) {
1217                         rc = -ENOMEM;
1218                         goto exit;
1219                 }
1220
1221                 tlvs_len += sdreq->tlv_len;
1222
1223                 hlist_add_head(&sdreq->node, &sdreq_list);
1224         }
1225
1226         if (hlist_empty(&sdreq_list)) {
1227                 rc = -EINVAL;
1228                 goto exit;
1229         }
1230
1231         rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1232 exit:
1233         device_unlock(&dev->dev);
1234
1235         nfc_put_device(dev);
1236
1237         return rc;
1238 }
1239
1240 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1241 {
1242         struct nfc_dev *dev;
1243         int rc;
1244         u32 idx;
1245         char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1246
1247         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1248                 return -EINVAL;
1249
1250         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1251
1252         dev = nfc_get_device(idx);
1253         if (!dev)
1254                 return -ENODEV;
1255
1256         nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1257                     sizeof(firmware_name));
1258
1259         rc = nfc_fw_download(dev, firmware_name);
1260
1261         nfc_put_device(dev);
1262         return rc;
1263 }
1264
1265 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1266                               u32 result)
1267 {
1268         struct sk_buff *msg;
1269         void *hdr;
1270
1271         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1272         if (!msg)
1273                 return -ENOMEM;
1274
1275         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1276                           NFC_CMD_FW_DOWNLOAD);
1277         if (!hdr)
1278                 goto free_msg;
1279
1280         if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1281             nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1282             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1283                 goto nla_put_failure;
1284
1285         genlmsg_end(msg, hdr);
1286
1287         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1288
1289         return 0;
1290
1291 nla_put_failure:
1292         genlmsg_cancel(msg, hdr);
1293 free_msg:
1294         nlmsg_free(msg);
1295         return -EMSGSIZE;
1296 }
1297
1298 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1299 {
1300         struct nfc_dev *dev;
1301         int rc;
1302         u32 idx, se_idx;
1303
1304         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1305             !info->attrs[NFC_ATTR_SE_INDEX])
1306                 return -EINVAL;
1307
1308         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1309         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1310
1311         dev = nfc_get_device(idx);
1312         if (!dev)
1313                 return -ENODEV;
1314
1315         rc = nfc_enable_se(dev, se_idx);
1316
1317         nfc_put_device(dev);
1318         return rc;
1319 }
1320
1321 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1322 {
1323         struct nfc_dev *dev;
1324         int rc;
1325         u32 idx, se_idx;
1326
1327         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1328             !info->attrs[NFC_ATTR_SE_INDEX])
1329                 return -EINVAL;
1330
1331         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1332         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1333
1334         dev = nfc_get_device(idx);
1335         if (!dev)
1336                 return -ENODEV;
1337
1338         rc = nfc_disable_se(dev, se_idx);
1339
1340         nfc_put_device(dev);
1341         return rc;
1342 }
1343
1344 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1345                                 u32 portid, u32 seq,
1346                                 struct netlink_callback *cb,
1347                                 int flags)
1348 {
1349         void *hdr;
1350         struct nfc_se *se, *n;
1351
1352         list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1353                 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1354                                   NFC_CMD_GET_SE);
1355                 if (!hdr)
1356                         goto nla_put_failure;
1357
1358                 if (cb)
1359                         genl_dump_check_consistent(cb, hdr);
1360
1361                 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1362                     nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1363                     nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1364                         goto nla_put_failure;
1365
1366                 genlmsg_end(msg, hdr);
1367         }
1368
1369         return 0;
1370
1371 nla_put_failure:
1372         genlmsg_cancel(msg, hdr);
1373         return -EMSGSIZE;
1374 }
1375
1376 static int nfc_genl_dump_ses(struct sk_buff *skb,
1377                                  struct netlink_callback *cb)
1378 {
1379         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1380         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1381         bool first_call = false;
1382
1383         if (!iter) {
1384                 first_call = true;
1385                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1386                 if (!iter)
1387                         return -ENOMEM;
1388                 cb->args[0] = (long) iter;
1389         }
1390
1391         mutex_lock(&nfc_devlist_mutex);
1392
1393         cb->seq = nfc_devlist_generation;
1394
1395         if (first_call) {
1396                 nfc_device_iter_init(iter);
1397                 dev = nfc_device_iter_next(iter);
1398         }
1399
1400         while (dev) {
1401                 int rc;
1402
1403                 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1404                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1405                 if (rc < 0)
1406                         break;
1407
1408                 dev = nfc_device_iter_next(iter);
1409         }
1410
1411         mutex_unlock(&nfc_devlist_mutex);
1412
1413         cb->args[1] = (long) dev;
1414
1415         return skb->len;
1416 }
1417
1418 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1419 {
1420         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1421
1422         nfc_device_iter_exit(iter);
1423         kfree(iter);
1424
1425         return 0;
1426 }
1427
1428 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1429                      u8 *apdu, size_t apdu_length,
1430                      se_io_cb_t cb, void *cb_context)
1431 {
1432         struct nfc_se *se;
1433         int rc;
1434
1435         pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1436
1437         device_lock(&dev->dev);
1438
1439         if (!device_is_registered(&dev->dev)) {
1440                 rc = -ENODEV;
1441                 goto error;
1442         }
1443
1444         if (!dev->dev_up) {
1445                 rc = -ENODEV;
1446                 goto error;
1447         }
1448
1449         if (!dev->ops->se_io) {
1450                 rc = -EOPNOTSUPP;
1451                 goto error;
1452         }
1453
1454         se = nfc_find_se(dev, se_idx);
1455         if (!se) {
1456                 rc = -EINVAL;
1457                 goto error;
1458         }
1459
1460         if (se->state != NFC_SE_ENABLED) {
1461                 rc = -ENODEV;
1462                 goto error;
1463         }
1464
1465         rc = dev->ops->se_io(dev, se_idx, apdu,
1466                         apdu_length, cb, cb_context);
1467
1468 error:
1469         device_unlock(&dev->dev);
1470         return rc;
1471 }
1472
1473 struct se_io_ctx {
1474         u32 dev_idx;
1475         u32 se_idx;
1476 };
1477
1478 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1479 {
1480         struct se_io_ctx *ctx = context;
1481         struct sk_buff *msg;
1482         void *hdr;
1483
1484         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1485         if (!msg) {
1486                 kfree(ctx);
1487                 return;
1488         }
1489
1490         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1491                           NFC_CMD_SE_IO);
1492         if (!hdr)
1493                 goto free_msg;
1494
1495         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1496             nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1497             nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1498                 goto nla_put_failure;
1499
1500         genlmsg_end(msg, hdr);
1501
1502         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1503
1504         kfree(ctx);
1505
1506         return;
1507
1508 nla_put_failure:
1509         genlmsg_cancel(msg, hdr);
1510 free_msg:
1511         nlmsg_free(msg);
1512         kfree(ctx);
1513
1514         return;
1515 }
1516
1517 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1518 {
1519         struct nfc_dev *dev;
1520         struct se_io_ctx *ctx;
1521         u32 dev_idx, se_idx;
1522         u8 *apdu;
1523         size_t apdu_len;
1524
1525         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1526             !info->attrs[NFC_ATTR_SE_INDEX] ||
1527             !info->attrs[NFC_ATTR_SE_APDU])
1528                 return -EINVAL;
1529
1530         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1531         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1532
1533         dev = nfc_get_device(dev_idx);
1534         if (!dev)
1535                 return -ENODEV;
1536
1537         if (!dev->ops || !dev->ops->se_io)
1538                 return -ENOTSUPP;
1539
1540         apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1541         if (apdu_len == 0)
1542                 return -EINVAL;
1543
1544         apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1545         if (!apdu)
1546                 return -EINVAL;
1547
1548         ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1549         if (!ctx)
1550                 return -ENOMEM;
1551
1552         ctx->dev_idx = dev_idx;
1553         ctx->se_idx = se_idx;
1554
1555         return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1556 }
1557
1558 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1559                                struct genl_info *info)
1560 {
1561         struct nfc_dev *dev;
1562         struct nfc_vendor_cmd *cmd;
1563         u32 dev_idx, vid, subcmd;
1564         u8 *data;
1565         size_t data_len;
1566         int i, err;
1567
1568         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1569             !info->attrs[NFC_ATTR_VENDOR_ID] ||
1570             !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1571                 return -EINVAL;
1572
1573         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1574         vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1575         subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1576
1577         dev = nfc_get_device(dev_idx);
1578         if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
1579                 return -ENODEV;
1580
1581         if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1582                 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1583                 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1584                 if (data_len == 0)
1585                         return -EINVAL;
1586         } else {
1587                 data = NULL;
1588                 data_len = 0;
1589         }
1590
1591         for (i = 0; i < dev->n_vendor_cmds; i++) {
1592                 cmd = &dev->vendor_cmds[i];
1593
1594                 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1595                         continue;
1596
1597                 dev->cur_cmd_info = info;
1598                 err = cmd->doit(dev, data, data_len);
1599                 dev->cur_cmd_info = NULL;
1600                 return err;
1601         }
1602
1603         return -EOPNOTSUPP;
1604 }
1605
1606 /* message building helper */
1607 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1608                                 int flags, u8 cmd)
1609 {
1610         /* since there is no private header just add the generic one */
1611         return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1612 }
1613
1614 static struct sk_buff *
1615 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1616                            u32 portid, u32 seq,
1617                            enum nfc_attrs attr,
1618                            u32 oui, u32 subcmd, gfp_t gfp)
1619 {
1620         struct sk_buff *skb;
1621         void *hdr;
1622
1623         skb = nlmsg_new(approxlen + 100, gfp);
1624         if (!skb)
1625                 return NULL;
1626
1627         hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1628         if (!hdr) {
1629                 kfree_skb(skb);
1630                 return NULL;
1631         }
1632
1633         if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1634                 goto nla_put_failure;
1635         if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1636                 goto nla_put_failure;
1637         if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1638                 goto nla_put_failure;
1639
1640         ((void **)skb->cb)[0] = dev;
1641         ((void **)skb->cb)[1] = hdr;
1642
1643         return skb;
1644
1645 nla_put_failure:
1646         kfree_skb(skb);
1647         return NULL;
1648 }
1649
1650 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1651                                                  enum nfc_attrs attr,
1652                                                  u32 oui, u32 subcmd,
1653                                                  int approxlen)
1654 {
1655         if (WARN_ON(!dev->cur_cmd_info))
1656                 return NULL;
1657
1658         return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1659                                           dev->cur_cmd_info->snd_portid,
1660                                           dev->cur_cmd_info->snd_seq, attr,
1661                                           oui, subcmd, GFP_KERNEL);
1662 }
1663 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1664
1665 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1666 {
1667         struct nfc_dev *dev = ((void **)skb->cb)[0];
1668         void *hdr = ((void **)skb->cb)[1];
1669
1670         /* clear CB data for netlink core to own from now on */
1671         memset(skb->cb, 0, sizeof(skb->cb));
1672
1673         if (WARN_ON(!dev->cur_cmd_info)) {
1674                 kfree_skb(skb);
1675                 return -EINVAL;
1676         }
1677
1678         genlmsg_end(skb, hdr);
1679         return genlmsg_reply(skb, dev->cur_cmd_info);
1680 }
1681 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1682
1683 static const struct genl_ops nfc_genl_ops[] = {
1684         {
1685                 .cmd = NFC_CMD_GET_DEVICE,
1686                 .doit = nfc_genl_get_device,
1687                 .dumpit = nfc_genl_dump_devices,
1688                 .done = nfc_genl_dump_devices_done,
1689                 .policy = nfc_genl_policy,
1690         },
1691         {
1692                 .cmd = NFC_CMD_DEV_UP,
1693                 .doit = nfc_genl_dev_up,
1694                 .policy = nfc_genl_policy,
1695         },
1696         {
1697                 .cmd = NFC_CMD_DEV_DOWN,
1698                 .doit = nfc_genl_dev_down,
1699                 .policy = nfc_genl_policy,
1700         },
1701         {
1702                 .cmd = NFC_CMD_START_POLL,
1703                 .doit = nfc_genl_start_poll,
1704                 .policy = nfc_genl_policy,
1705         },
1706         {
1707                 .cmd = NFC_CMD_STOP_POLL,
1708                 .doit = nfc_genl_stop_poll,
1709                 .policy = nfc_genl_policy,
1710         },
1711         {
1712                 .cmd = NFC_CMD_DEP_LINK_UP,
1713                 .doit = nfc_genl_dep_link_up,
1714                 .policy = nfc_genl_policy,
1715         },
1716         {
1717                 .cmd = NFC_CMD_DEP_LINK_DOWN,
1718                 .doit = nfc_genl_dep_link_down,
1719                 .policy = nfc_genl_policy,
1720         },
1721         {
1722                 .cmd = NFC_CMD_GET_TARGET,
1723                 .dumpit = nfc_genl_dump_targets,
1724                 .done = nfc_genl_dump_targets_done,
1725                 .policy = nfc_genl_policy,
1726         },
1727         {
1728                 .cmd = NFC_CMD_LLC_GET_PARAMS,
1729                 .doit = nfc_genl_llc_get_params,
1730                 .policy = nfc_genl_policy,
1731         },
1732         {
1733                 .cmd = NFC_CMD_LLC_SET_PARAMS,
1734                 .doit = nfc_genl_llc_set_params,
1735                 .policy = nfc_genl_policy,
1736         },
1737         {
1738                 .cmd = NFC_CMD_LLC_SDREQ,
1739                 .doit = nfc_genl_llc_sdreq,
1740                 .policy = nfc_genl_policy,
1741         },
1742         {
1743                 .cmd = NFC_CMD_FW_DOWNLOAD,
1744                 .doit = nfc_genl_fw_download,
1745                 .policy = nfc_genl_policy,
1746         },
1747         {
1748                 .cmd = NFC_CMD_ENABLE_SE,
1749                 .doit = nfc_genl_enable_se,
1750                 .policy = nfc_genl_policy,
1751         },
1752         {
1753                 .cmd = NFC_CMD_DISABLE_SE,
1754                 .doit = nfc_genl_disable_se,
1755                 .policy = nfc_genl_policy,
1756         },
1757         {
1758                 .cmd = NFC_CMD_GET_SE,
1759                 .dumpit = nfc_genl_dump_ses,
1760                 .done = nfc_genl_dump_ses_done,
1761                 .policy = nfc_genl_policy,
1762         },
1763         {
1764                 .cmd = NFC_CMD_SE_IO,
1765                 .doit = nfc_genl_se_io,
1766                 .policy = nfc_genl_policy,
1767         },
1768         {
1769                 .cmd = NFC_CMD_ACTIVATE_TARGET,
1770                 .doit = nfc_genl_activate_target,
1771                 .policy = nfc_genl_policy,
1772         },
1773         {
1774                 .cmd = NFC_CMD_VENDOR,
1775                 .doit = nfc_genl_vendor_cmd,
1776                 .policy = nfc_genl_policy,
1777         },
1778         {
1779                 .cmd = NFC_CMD_DEACTIVATE_TARGET,
1780                 .doit = nfc_genl_deactivate_target,
1781                 .policy = nfc_genl_policy,
1782         },
1783 };
1784
1785 static struct genl_family nfc_genl_family __ro_after_init = {
1786         .hdrsize = 0,
1787         .name = NFC_GENL_NAME,
1788         .version = NFC_GENL_VERSION,
1789         .maxattr = NFC_ATTR_MAX,
1790         .module = THIS_MODULE,
1791         .ops = nfc_genl_ops,
1792         .n_ops = ARRAY_SIZE(nfc_genl_ops),
1793         .mcgrps = nfc_genl_mcgrps,
1794         .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1795 };
1796
1797
1798 struct urelease_work {
1799         struct  work_struct w;
1800         u32     portid;
1801 };
1802
1803 static void nfc_urelease_event_work(struct work_struct *work)
1804 {
1805         struct urelease_work *w = container_of(work, struct urelease_work, w);
1806         struct class_dev_iter iter;
1807         struct nfc_dev *dev;
1808
1809         pr_debug("portid %d\n", w->portid);
1810
1811         mutex_lock(&nfc_devlist_mutex);
1812
1813         nfc_device_iter_init(&iter);
1814         dev = nfc_device_iter_next(&iter);
1815
1816         while (dev) {
1817                 mutex_lock(&dev->genl_data.genl_data_mutex);
1818
1819                 if (dev->genl_data.poll_req_portid == w->portid) {
1820                         nfc_stop_poll(dev);
1821                         dev->genl_data.poll_req_portid = 0;
1822                 }
1823
1824                 mutex_unlock(&dev->genl_data.genl_data_mutex);
1825
1826                 dev = nfc_device_iter_next(&iter);
1827         }
1828
1829         nfc_device_iter_exit(&iter);
1830
1831         mutex_unlock(&nfc_devlist_mutex);
1832
1833         kfree(w);
1834 }
1835
1836 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1837                                  unsigned long event, void *ptr)
1838 {
1839         struct netlink_notify *n = ptr;
1840         struct urelease_work *w;
1841
1842         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1843                 goto out;
1844
1845         pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1846
1847         w = kmalloc(sizeof(*w), GFP_ATOMIC);
1848         if (w) {
1849                 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
1850                 w->portid = n->portid;
1851                 schedule_work((struct work_struct *) w);
1852         }
1853
1854 out:
1855         return NOTIFY_DONE;
1856 }
1857
1858 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1859 {
1860         genl_data->poll_req_portid = 0;
1861         mutex_init(&genl_data->genl_data_mutex);
1862 }
1863
1864 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1865 {
1866         mutex_destroy(&genl_data->genl_data_mutex);
1867 }
1868
1869 static struct notifier_block nl_notifier = {
1870         .notifier_call  = nfc_genl_rcv_nl_event,
1871 };
1872
1873 /**
1874  * nfc_genl_init() - Initialize netlink interface
1875  *
1876  * This initialization function registers the nfc netlink family.
1877  */
1878 int __init nfc_genl_init(void)
1879 {
1880         int rc;
1881
1882         rc = genl_register_family(&nfc_genl_family);
1883         if (rc)
1884                 return rc;
1885
1886         netlink_register_notifier(&nl_notifier);
1887
1888         return 0;
1889 }
1890
1891 /**
1892  * nfc_genl_exit() - Deinitialize netlink interface
1893  *
1894  * This exit function unregisters the nfc netlink family.
1895  */
1896 void nfc_genl_exit(void)
1897 {
1898         netlink_unregister_notifier(&nl_notifier);
1899         genl_unregister_family(&nfc_genl_family);
1900 }