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                 return -EINVAL;
 912
 913         device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 914
 915         dev = nfc_get_device(device_idx);
 916         if (!dev)
 917                 return -ENODEV;
 918
 919         target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 920         protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 921
 922         nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 923         rc = nfc_activate_target(dev, target_idx, protocol);
 924
 925         nfc_put_device(dev);
 926         return rc;
 927 }
 928
 929 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 930 {
 931         struct nfc_dev *dev;
 932         int rc, tgt_idx;
 933         u32 idx;
 934         u8 comm;
 935
 936         pr_debug("DEP link up\n");
 937
 938         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 939             !info->attrs[NFC_ATTR_COMM_MODE])
 940                 return -EINVAL;
 941
 942         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 943         if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 944                 tgt_idx = NFC_TARGET_IDX_ANY;
 945         else
 946                 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 947
 948         comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 949
 950         if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 951                 return -EINVAL;
 952
 953         dev = nfc_get_device(idx);
 954         if (!dev)
 955                 return -ENODEV;
 956
 957         rc = nfc_dep_link_up(dev, tgt_idx, comm);
 958
 959         nfc_put_device(dev);
 960
 961         return rc;
 962 }
 963
 964 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 965 {
 966         struct nfc_dev *dev;
 967         int rc;
 968         u32 idx;
 969
 970         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 971                 return -EINVAL;
 972
 973         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 974
 975         dev = nfc_get_device(idx);
 976         if (!dev)
 977                 return -ENODEV;
 978
 979         rc = nfc_dep_link_down(dev);
 980
 981         nfc_put_device(dev);
 982         return rc;
 983 }
 984
 985 static int nfc_genl_send_params(struct sk_buff *msg,
 986                                 struct nfc_llcp_local *local,
 987                                 u32 portid, u32 seq)
 988 {
 989         void *hdr;
 990
 991         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
 992                           NFC_CMD_LLC_GET_PARAMS);
 993         if (!hdr)
 994                 return -EMSGSIZE;
 995
 996         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
 997             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
 998             nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
 999             nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1000                 goto nla_put_failure;
1001
1002         genlmsg_end(msg, hdr);
1003         return 0;
1004
1005 nla_put_failure:
1006
1007         genlmsg_cancel(msg, hdr);
1008         return -EMSGSIZE;
1009 }
1010
1011 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1012 {
1013         struct nfc_dev *dev;
1014         struct nfc_llcp_local *local;
1015         int rc = 0;
1016         struct sk_buff *msg = NULL;
1017         u32 idx;
1018
1019         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1020                 return -EINVAL;
1021
1022         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1023
1024         dev = nfc_get_device(idx);
1025         if (!dev)
1026                 return -ENODEV;
1027
1028         device_lock(&dev->dev);
1029
1030         local = nfc_llcp_find_local(dev);
1031         if (!local) {
1032                 rc = -ENODEV;
1033                 goto exit;
1034         }
1035
1036         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1037         if (!msg) {
1038                 rc = -ENOMEM;
1039                 goto exit;
1040         }
1041
1042         rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1043
1044 exit:
1045         device_unlock(&dev->dev);
1046
1047         nfc_put_device(dev);
1048
1049         if (rc < 0) {
1050                 if (msg)
1051                         nlmsg_free(msg);
1052
1053                 return rc;
1054         }
1055
1056         return genlmsg_reply(msg, info);
1057 }
1058
1059 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1060 {
1061         struct nfc_dev *dev;
1062         struct nfc_llcp_local *local;
1063         u8 rw = 0;
1064         u16 miux = 0;
1065         u32 idx;
1066         int rc = 0;
1067
1068         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1069             (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1070              !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1071              !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1072                 return -EINVAL;
1073
1074         if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1075                 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1076
1077                 if (rw > LLCP_MAX_RW)
1078                         return -EINVAL;
1079         }
1080
1081         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1082                 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1083
1084                 if (miux > LLCP_MAX_MIUX)
1085                         return -EINVAL;
1086         }
1087
1088         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1089
1090         dev = nfc_get_device(idx);
1091         if (!dev)
1092                 return -ENODEV;
1093
1094         device_lock(&dev->dev);
1095
1096         local = nfc_llcp_find_local(dev);
1097         if (!local) {
1098                 nfc_put_device(dev);
1099                 rc = -ENODEV;
1100                 goto exit;
1101         }
1102
1103         if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1104                 if (dev->dep_link_up) {
1105                         rc = -EINPROGRESS;
1106                         goto exit;
1107                 }
1108
1109                 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1110         }
1111
1112         if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1113                 local->rw = rw;
1114
1115         if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1116                 local->miux = cpu_to_be16(miux);
1117
1118 exit:
1119         device_unlock(&dev->dev);
1120
1121         nfc_put_device(dev);
1122
1123         return rc;
1124 }
1125
1126 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1127 {
1128         struct nfc_dev *dev;
1129         struct nfc_llcp_local *local;
1130         struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1131         u32 idx;
1132         u8 tid;
1133         char *uri;
1134         int rc = 0, rem;
1135         size_t uri_len, tlvs_len;
1136         struct hlist_head sdreq_list;
1137         struct nfc_llcp_sdp_tlv *sdreq;
1138
1139         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1140             !info->attrs[NFC_ATTR_LLC_SDP])
1141                 return -EINVAL;
1142
1143         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1144
1145         dev = nfc_get_device(idx);
1146         if (!dev)
1147                 return -ENODEV;
1148
1149         device_lock(&dev->dev);
1150
1151         if (dev->dep_link_up == false) {
1152                 rc = -ENOLINK;
1153                 goto exit;
1154         }
1155
1156         local = nfc_llcp_find_local(dev);
1157         if (!local) {
1158                 nfc_put_device(dev);
1159                 rc = -ENODEV;
1160                 goto exit;
1161         }
1162
1163         INIT_HLIST_HEAD(&sdreq_list);
1164
1165         tlvs_len = 0;
1166
1167         nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1168                 rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
1169                                       nfc_sdp_genl_policy, info->extack);
1170
1171                 if (rc != 0) {
1172                         rc = -EINVAL;
1173                         goto exit;
1174                 }
1175
1176                 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1177                         continue;
1178
1179                 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1180                 if (uri_len == 0)
1181                         continue;
1182
1183                 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1184                 if (uri == NULL || *uri == 0)
1185                         continue;
1186
1187                 tid = local->sdreq_next_tid++;
1188
1189                 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1190                 if (sdreq == NULL) {
1191                         rc = -ENOMEM;
1192                         goto exit;
1193                 }
1194
1195                 tlvs_len += sdreq->tlv_len;
1196
1197                 hlist_add_head(&sdreq->node, &sdreq_list);
1198         }
1199
1200         if (hlist_empty(&sdreq_list)) {
1201                 rc = -EINVAL;
1202                 goto exit;
1203         }
1204
1205         rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1206 exit:
1207         device_unlock(&dev->dev);
1208
1209         nfc_put_device(dev);
1210
1211         return rc;
1212 }
1213
1214 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1215 {
1216         struct nfc_dev *dev;
1217         int rc;
1218         u32 idx;
1219         char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1220
1221         if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1222                 return -EINVAL;
1223
1224         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1225
1226         dev = nfc_get_device(idx);
1227         if (!dev)
1228                 return -ENODEV;
1229
1230         nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1231                     sizeof(firmware_name));
1232
1233         rc = nfc_fw_download(dev, firmware_name);
1234
1235         nfc_put_device(dev);
1236         return rc;
1237 }
1238
1239 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1240                               u32 result)
1241 {
1242         struct sk_buff *msg;
1243         void *hdr;
1244
1245         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1246         if (!msg)
1247                 return -ENOMEM;
1248
1249         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1250                           NFC_CMD_FW_DOWNLOAD);
1251         if (!hdr)
1252                 goto free_msg;
1253
1254         if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1255             nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1256             nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1257                 goto nla_put_failure;
1258
1259         genlmsg_end(msg, hdr);
1260
1261         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1262
1263         return 0;
1264
1265 nla_put_failure:
1266         genlmsg_cancel(msg, hdr);
1267 free_msg:
1268         nlmsg_free(msg);
1269         return -EMSGSIZE;
1270 }
1271
1272 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1273 {
1274         struct nfc_dev *dev;
1275         int rc;
1276         u32 idx, se_idx;
1277
1278         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1279             !info->attrs[NFC_ATTR_SE_INDEX])
1280                 return -EINVAL;
1281
1282         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1283         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1284
1285         dev = nfc_get_device(idx);
1286         if (!dev)
1287                 return -ENODEV;
1288
1289         rc = nfc_enable_se(dev, se_idx);
1290
1291         nfc_put_device(dev);
1292         return rc;
1293 }
1294
1295 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1296 {
1297         struct nfc_dev *dev;
1298         int rc;
1299         u32 idx, se_idx;
1300
1301         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1302             !info->attrs[NFC_ATTR_SE_INDEX])
1303                 return -EINVAL;
1304
1305         idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1306         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1307
1308         dev = nfc_get_device(idx);
1309         if (!dev)
1310                 return -ENODEV;
1311
1312         rc = nfc_disable_se(dev, se_idx);
1313
1314         nfc_put_device(dev);
1315         return rc;
1316 }
1317
1318 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1319                                 u32 portid, u32 seq,
1320                                 struct netlink_callback *cb,
1321                                 int flags)
1322 {
1323         void *hdr;
1324         struct nfc_se *se, *n;
1325
1326         list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1327                 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1328                                   NFC_CMD_GET_SE);
1329                 if (!hdr)
1330                         goto nla_put_failure;
1331
1332                 if (cb)
1333                         genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
1334
1335                 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1336                     nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1337                     nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1338                         goto nla_put_failure;
1339
1340                 genlmsg_end(msg, hdr);
1341         }
1342
1343         return 0;
1344
1345 nla_put_failure:
1346         genlmsg_cancel(msg, hdr);
1347         return -EMSGSIZE;
1348 }
1349
1350 static int nfc_genl_dump_ses(struct sk_buff *skb,
1351                                  struct netlink_callback *cb)
1352 {
1353         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1354         struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1355         bool first_call = false;
1356
1357         if (!iter) {
1358                 first_call = true;
1359                 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1360                 if (!iter)
1361                         return -ENOMEM;
1362                 cb->args[0] = (long) iter;
1363         }
1364
1365         mutex_lock(&nfc_devlist_mutex);
1366
1367         cb->seq = nfc_devlist_generation;
1368
1369         if (first_call) {
1370                 nfc_device_iter_init(iter);
1371                 dev = nfc_device_iter_next(iter);
1372         }
1373
1374         while (dev) {
1375                 int rc;
1376
1377                 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1378                                           cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1379                 if (rc < 0)
1380                         break;
1381
1382                 dev = nfc_device_iter_next(iter);
1383         }
1384
1385         mutex_unlock(&nfc_devlist_mutex);
1386
1387         cb->args[1] = (long) dev;
1388
1389         return skb->len;
1390 }
1391
1392 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1393 {
1394         struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1395
1396         nfc_device_iter_exit(iter);
1397         kfree(iter);
1398
1399         return 0;
1400 }
1401
1402 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1403                      u8 *apdu, size_t apdu_length,
1404                      se_io_cb_t cb, void *cb_context)
1405 {
1406         struct nfc_se *se;
1407         int rc;
1408
1409         pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1410
1411         device_lock(&dev->dev);
1412
1413         if (!device_is_registered(&dev->dev)) {
1414                 rc = -ENODEV;
1415                 goto error;
1416         }
1417
1418         if (!dev->dev_up) {
1419                 rc = -ENODEV;
1420                 goto error;
1421         }
1422
1423         if (!dev->ops->se_io) {
1424                 rc = -EOPNOTSUPP;
1425                 goto error;
1426         }
1427
1428         se = nfc_find_se(dev, se_idx);
1429         if (!se) {
1430                 rc = -EINVAL;
1431                 goto error;
1432         }
1433
1434         if (se->state != NFC_SE_ENABLED) {
1435                 rc = -ENODEV;
1436                 goto error;
1437         }
1438
1439         rc = dev->ops->se_io(dev, se_idx, apdu,
1440                         apdu_length, cb, cb_context);
1441
1442 error:
1443         device_unlock(&dev->dev);
1444         return rc;
1445 }
1446
1447 struct se_io_ctx {
1448         u32 dev_idx;
1449         u32 se_idx;
1450 };
1451
1452 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1453 {
1454         struct se_io_ctx *ctx = context;
1455         struct sk_buff *msg;
1456         void *hdr;
1457
1458         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1459         if (!msg) {
1460                 kfree(ctx);
1461                 return;
1462         }
1463
1464         hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1465                           NFC_CMD_SE_IO);
1466         if (!hdr)
1467                 goto free_msg;
1468
1469         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1470             nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1471             nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1472                 goto nla_put_failure;
1473
1474         genlmsg_end(msg, hdr);
1475
1476         genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1477
1478         kfree(ctx);
1479
1480         return;
1481
1482 nla_put_failure:
1483         genlmsg_cancel(msg, hdr);
1484 free_msg:
1485         nlmsg_free(msg);
1486         kfree(ctx);
1487
1488         return;
1489 }
1490
1491 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1492 {
1493         struct nfc_dev *dev;
1494         struct se_io_ctx *ctx;
1495         u32 dev_idx, se_idx;
1496         u8 *apdu;
1497         size_t apdu_len;
1498
1499         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1500             !info->attrs[NFC_ATTR_SE_INDEX] ||
1501             !info->attrs[NFC_ATTR_SE_APDU])
1502                 return -EINVAL;
1503
1504         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1505         se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1506
1507         dev = nfc_get_device(dev_idx);
1508         if (!dev)
1509                 return -ENODEV;
1510
1511         if (!dev->ops || !dev->ops->se_io)
1512                 return -ENOTSUPP;
1513
1514         apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1515         if (apdu_len == 0)
1516                 return -EINVAL;
1517
1518         apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1519         if (!apdu)
1520                 return -EINVAL;
1521
1522         ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1523         if (!ctx)
1524                 return -ENOMEM;
1525
1526         ctx->dev_idx = dev_idx;
1527         ctx->se_idx = se_idx;
1528
1529         return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1530 }
1531
1532 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1533                                struct genl_info *info)
1534 {
1535         struct nfc_dev *dev;
1536         struct nfc_vendor_cmd *cmd;
1537         u32 dev_idx, vid, subcmd;
1538         u8 *data;
1539         size_t data_len;
1540         int i, err;
1541
1542         if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1543             !info->attrs[NFC_ATTR_VENDOR_ID] ||
1544             !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1545                 return -EINVAL;
1546
1547         dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1548         vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1549         subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1550
1551         dev = nfc_get_device(dev_idx);
1552         if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
1553                 return -ENODEV;
1554
1555         if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1556                 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1557                 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1558                 if (data_len == 0)
1559                         return -EINVAL;
1560         } else {
1561                 data = NULL;
1562                 data_len = 0;
1563         }
1564
1565         for (i = 0; i < dev->n_vendor_cmds; i++) {
1566                 cmd = &dev->vendor_cmds[i];
1567
1568                 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1569                         continue;
1570
1571                 dev->cur_cmd_info = info;
1572                 err = cmd->doit(dev, data, data_len);
1573                 dev->cur_cmd_info = NULL;
1574                 return err;
1575         }
1576
1577         return -EOPNOTSUPP;
1578 }
1579
1580 /* message building helper */
1581 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1582                                 int flags, u8 cmd)
1583 {
1584         /* since there is no private header just add the generic one */
1585         return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1586 }
1587
1588 static struct sk_buff *
1589 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1590                            u32 portid, u32 seq,
1591                            enum nfc_attrs attr,
1592                            u32 oui, u32 subcmd, gfp_t gfp)
1593 {
1594         struct sk_buff *skb;
1595         void *hdr;
1596
1597         skb = nlmsg_new(approxlen + 100, gfp);
1598         if (!skb)
1599                 return NULL;
1600
1601         hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1602         if (!hdr) {
1603                 kfree_skb(skb);
1604                 return NULL;
1605         }
1606
1607         if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1608                 goto nla_put_failure;
1609         if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1610                 goto nla_put_failure;
1611         if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1612                 goto nla_put_failure;
1613
1614         ((void **)skb->cb)[0] = dev;
1615         ((void **)skb->cb)[1] = hdr;
1616
1617         return skb;
1618
1619 nla_put_failure:
1620         kfree_skb(skb);
1621         return NULL;
1622 }
1623
1624 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1625                                                  enum nfc_attrs attr,
1626                                                  u32 oui, u32 subcmd,
1627                                                  int approxlen)
1628 {
1629         if (WARN_ON(!dev->cur_cmd_info))
1630                 return NULL;
1631
1632         return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1633                                           dev->cur_cmd_info->snd_portid,
1634                                           dev->cur_cmd_info->snd_seq, attr,
1635                                           oui, subcmd, GFP_KERNEL);
1636 }
1637 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1638
1639 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1640 {
1641         struct nfc_dev *dev = ((void **)skb->cb)[0];
1642         void *hdr = ((void **)skb->cb)[1];
1643
1644         /* clear CB data for netlink core to own from now on */
1645         memset(skb->cb, 0, sizeof(skb->cb));
1646
1647         if (WARN_ON(!dev->cur_cmd_info)) {
1648                 kfree_skb(skb);
1649                 return -EINVAL;
1650         }
1651
1652         genlmsg_end(skb, hdr);
1653         return genlmsg_reply(skb, dev->cur_cmd_info);
1654 }
1655 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1656
1657 static const struct genl_ops nfc_genl_ops[] = {
1658         {
1659                 .cmd = NFC_CMD_GET_DEVICE,
1660                 .doit = nfc_genl_get_device,
1661                 .dumpit = nfc_genl_dump_devices,
1662                 .done = nfc_genl_dump_devices_done,
1663                 .policy = nfc_genl_policy,
1664         },
1665         {
1666                 .cmd = NFC_CMD_DEV_UP,
1667                 .doit = nfc_genl_dev_up,
1668                 .policy = nfc_genl_policy,
1669         },
1670         {
1671                 .cmd = NFC_CMD_DEV_DOWN,
1672                 .doit = nfc_genl_dev_down,
1673                 .policy = nfc_genl_policy,
1674         },
1675         {
1676                 .cmd = NFC_CMD_START_POLL,
1677                 .doit = nfc_genl_start_poll,
1678                 .policy = nfc_genl_policy,
1679         },
1680         {
1681                 .cmd = NFC_CMD_STOP_POLL,
1682                 .doit = nfc_genl_stop_poll,
1683                 .policy = nfc_genl_policy,
1684         },
1685         {
1686                 .cmd = NFC_CMD_DEP_LINK_UP,
1687                 .doit = nfc_genl_dep_link_up,
1688                 .policy = nfc_genl_policy,
1689         },
1690         {
1691                 .cmd = NFC_CMD_DEP_LINK_DOWN,
1692                 .doit = nfc_genl_dep_link_down,
1693                 .policy = nfc_genl_policy,
1694         },
1695         {
1696                 .cmd = NFC_CMD_GET_TARGET,
1697                 .dumpit = nfc_genl_dump_targets,
1698                 .done = nfc_genl_dump_targets_done,
1699                 .policy = nfc_genl_policy,
1700         },
1701         {
1702                 .cmd = NFC_CMD_LLC_GET_PARAMS,
1703                 .doit = nfc_genl_llc_get_params,
1704                 .policy = nfc_genl_policy,
1705         },
1706         {
1707                 .cmd = NFC_CMD_LLC_SET_PARAMS,
1708                 .doit = nfc_genl_llc_set_params,
1709                 .policy = nfc_genl_policy,
1710         },
1711         {
1712                 .cmd = NFC_CMD_LLC_SDREQ,
1713                 .doit = nfc_genl_llc_sdreq,
1714                 .policy = nfc_genl_policy,
1715         },
1716         {
1717                 .cmd = NFC_CMD_FW_DOWNLOAD,
1718                 .doit = nfc_genl_fw_download,
1719                 .policy = nfc_genl_policy,
1720         },
1721         {
1722                 .cmd = NFC_CMD_ENABLE_SE,
1723                 .doit = nfc_genl_enable_se,
1724                 .policy = nfc_genl_policy,
1725         },
1726         {
1727                 .cmd = NFC_CMD_DISABLE_SE,
1728                 .doit = nfc_genl_disable_se,
1729                 .policy = nfc_genl_policy,
1730         },
1731         {
1732                 .cmd = NFC_CMD_GET_SE,
1733                 .dumpit = nfc_genl_dump_ses,
1734                 .done = nfc_genl_dump_ses_done,
1735                 .policy = nfc_genl_policy,
1736         },
1737         {
1738                 .cmd = NFC_CMD_SE_IO,
1739                 .doit = nfc_genl_se_io,
1740                 .policy = nfc_genl_policy,
1741         },
1742         {
1743                 .cmd = NFC_CMD_ACTIVATE_TARGET,
1744                 .doit = nfc_genl_activate_target,
1745                 .policy = nfc_genl_policy,
1746         },
1747         {
1748                 .cmd = NFC_CMD_VENDOR,
1749                 .doit = nfc_genl_vendor_cmd,
1750                 .policy = nfc_genl_policy,
1751         },
1752 };
1753
1754 static struct genl_family nfc_genl_family __ro_after_init = {
1755         .hdrsize = 0,
1756         .name = NFC_GENL_NAME,
1757         .version = NFC_GENL_VERSION,
1758         .maxattr = NFC_ATTR_MAX,
1759         .module = THIS_MODULE,
1760         .ops = nfc_genl_ops,
1761         .n_ops = ARRAY_SIZE(nfc_genl_ops),
1762         .mcgrps = nfc_genl_mcgrps,
1763         .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1764 };
1765
1766
1767 struct urelease_work {
1768         struct  work_struct w;
1769         u32     portid;
1770 };
1771
1772 static void nfc_urelease_event_work(struct work_struct *work)
1773 {
1774         struct urelease_work *w = container_of(work, struct urelease_work, w);
1775         struct class_dev_iter iter;
1776         struct nfc_dev *dev;
1777
1778         pr_debug("portid %d\n", w->portid);
1779
1780         mutex_lock(&nfc_devlist_mutex);
1781
1782         nfc_device_iter_init(&iter);
1783         dev = nfc_device_iter_next(&iter);
1784
1785         while (dev) {
1786                 mutex_lock(&dev->genl_data.genl_data_mutex);
1787
1788                 if (dev->genl_data.poll_req_portid == w->portid) {
1789                         nfc_stop_poll(dev);
1790                         dev->genl_data.poll_req_portid = 0;
1791                 }
1792
1793                 mutex_unlock(&dev->genl_data.genl_data_mutex);
1794
1795                 dev = nfc_device_iter_next(&iter);
1796         }
1797
1798         nfc_device_iter_exit(&iter);
1799
1800         mutex_unlock(&nfc_devlist_mutex);
1801
1802         kfree(w);
1803 }
1804
1805 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1806                                  unsigned long event, void *ptr)
1807 {
1808         struct netlink_notify *n = ptr;
1809         struct urelease_work *w;
1810
1811         if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1812                 goto out;
1813
1814         pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1815
1816         w = kmalloc(sizeof(*w), GFP_ATOMIC);
1817         if (w) {
1818                 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
1819                 w->portid = n->portid;
1820                 schedule_work((struct work_struct *) w);
1821         }
1822
1823 out:
1824         return NOTIFY_DONE;
1825 }
1826
1827 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1828 {
1829         genl_data->poll_req_portid = 0;
1830         mutex_init(&genl_data->genl_data_mutex);
1831 }
1832
1833 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1834 {
1835         mutex_destroy(&genl_data->genl_data_mutex);
1836 }
1837
1838 static struct notifier_block nl_notifier = {
1839         .notifier_call  = nfc_genl_rcv_nl_event,
1840 };
1841
1842 /**
1843  * nfc_genl_init() - Initialize netlink interface
1844  *
1845  * This initialization function registers the nfc netlink family.
1846  */
1847 int __init nfc_genl_init(void)
1848 {
1849         int rc;
1850
1851         rc = genl_register_family(&nfc_genl_family);
1852         if (rc)
1853                 return rc;
1854
1855         netlink_register_notifier(&nl_notifier);
1856
1857         return 0;
1858 }
1859
1860 /**
1861  * nfc_genl_exit() - Deinitialize netlink interface
1862  *
1863  * This exit function unregisters the nfc netlink family.
1864  */
1865 void nfc_genl_exit(void)
1866 {
1867         netlink_unregister_notifier(&nl_notifier);
1868         genl_unregister_family(&nfc_genl_family);
1869 }