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 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the 20 * Free Software Foundation, Inc., 21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 22 */ 23 24 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 25 26 #include <net/genetlink.h> 27 #include <linux/nfc.h> 28 #include <linux/slab.h> 29 30 #include "nfc.h" 31 #include "llcp.h" 32 33 static struct genl_multicast_group nfc_genl_event_mcgrp = { 34 .name = NFC_GENL_MCAST_EVENT_NAME, 35 }; 36 37 static struct genl_family nfc_genl_family = { 38 .id = GENL_ID_GENERATE, 39 .hdrsize = 0, 40 .name = NFC_GENL_NAME, 41 .version = NFC_GENL_VERSION, 42 .maxattr = NFC_ATTR_MAX, 43 }; 44 45 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = { 46 [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 }, 47 [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING, 48 .len = NFC_DEVICE_NAME_MAXSIZE }, 49 [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 }, 50 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 }, 51 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 }, 52 [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 }, 53 [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 }, 54 [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 }, 55 [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 }, 56 [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 }, 57 [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 }, 58 [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED }, 59 [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING, 60 .len = NFC_FIRMWARE_NAME_MAXSIZE }, 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 return genlmsg_end(msg, hdr); 99 100 nla_put_failure: 101 genlmsg_cancel(msg, hdr); 102 return -EMSGSIZE; 103 } 104 105 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb) 106 { 107 struct nfc_dev *dev; 108 int rc; 109 u32 idx; 110 111 rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize, 112 nfc_genl_family.attrbuf, 113 nfc_genl_family.maxattr, 114 nfc_genl_policy); 115 if (rc < 0) 116 return ERR_PTR(rc); 117 118 if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]) 119 return ERR_PTR(-EINVAL); 120 121 idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]); 122 123 dev = nfc_get_device(idx); 124 if (!dev) 125 return ERR_PTR(-ENODEV); 126 127 return dev; 128 } 129 130 static int nfc_genl_dump_targets(struct sk_buff *skb, 131 struct netlink_callback *cb) 132 { 133 int i = cb->args[0]; 134 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; 135 int rc; 136 137 if (!dev) { 138 dev = __get_device_from_cb(cb); 139 if (IS_ERR(dev)) 140 return PTR_ERR(dev); 141 142 cb->args[1] = (long) dev; 143 } 144 145 device_lock(&dev->dev); 146 147 cb->seq = dev->targets_generation; 148 149 while (i < dev->n_targets) { 150 rc = nfc_genl_send_target(skb, &dev->targets[i], cb, 151 NLM_F_MULTI); 152 if (rc < 0) 153 break; 154 155 i++; 156 } 157 158 device_unlock(&dev->dev); 159 160 cb->args[0] = i; 161 162 return skb->len; 163 } 164 165 static int nfc_genl_dump_targets_done(struct netlink_callback *cb) 166 { 167 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; 168 169 if (dev) 170 nfc_put_device(dev); 171 172 return 0; 173 } 174 175 int nfc_genl_targets_found(struct nfc_dev *dev) 176 { 177 struct sk_buff *msg; 178 void *hdr; 179 180 dev->genl_data.poll_req_portid = 0; 181 182 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 183 if (!msg) 184 return -ENOMEM; 185 186 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 187 NFC_EVENT_TARGETS_FOUND); 188 if (!hdr) 189 goto free_msg; 190 191 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 192 goto nla_put_failure; 193 194 genlmsg_end(msg, hdr); 195 196 return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC); 197 198 nla_put_failure: 199 genlmsg_cancel(msg, hdr); 200 free_msg: 201 nlmsg_free(msg); 202 return -EMSGSIZE; 203 } 204 205 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx) 206 { 207 struct sk_buff *msg; 208 void *hdr; 209 210 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 211 if (!msg) 212 return -ENOMEM; 213 214 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 215 NFC_EVENT_TARGET_LOST); 216 if (!hdr) 217 goto free_msg; 218 219 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) || 220 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx)) 221 goto nla_put_failure; 222 223 genlmsg_end(msg, hdr); 224 225 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); 226 227 return 0; 228 229 nla_put_failure: 230 genlmsg_cancel(msg, hdr); 231 free_msg: 232 nlmsg_free(msg); 233 return -EMSGSIZE; 234 } 235 236 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol) 237 { 238 struct sk_buff *msg; 239 void *hdr; 240 241 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 242 if (!msg) 243 return -ENOMEM; 244 245 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 246 NFC_EVENT_TM_ACTIVATED); 247 if (!hdr) 248 goto free_msg; 249 250 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 251 goto nla_put_failure; 252 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol)) 253 goto nla_put_failure; 254 255 genlmsg_end(msg, hdr); 256 257 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); 258 259 return 0; 260 261 nla_put_failure: 262 genlmsg_cancel(msg, hdr); 263 free_msg: 264 nlmsg_free(msg); 265 return -EMSGSIZE; 266 } 267 268 int nfc_genl_tm_deactivated(struct nfc_dev *dev) 269 { 270 struct sk_buff *msg; 271 void *hdr; 272 273 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 274 if (!msg) 275 return -ENOMEM; 276 277 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 278 NFC_EVENT_TM_DEACTIVATED); 279 if (!hdr) 280 goto free_msg; 281 282 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 283 goto nla_put_failure; 284 285 genlmsg_end(msg, hdr); 286 287 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); 288 289 return 0; 290 291 nla_put_failure: 292 genlmsg_cancel(msg, hdr); 293 free_msg: 294 nlmsg_free(msg); 295 return -EMSGSIZE; 296 } 297 298 int nfc_genl_device_added(struct nfc_dev *dev) 299 { 300 struct sk_buff *msg; 301 void *hdr; 302 303 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 304 if (!msg) 305 return -ENOMEM; 306 307 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 308 NFC_EVENT_DEVICE_ADDED); 309 if (!hdr) 310 goto free_msg; 311 312 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) || 313 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 314 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) || 315 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up)) 316 goto nla_put_failure; 317 318 genlmsg_end(msg, hdr); 319 320 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); 321 322 return 0; 323 324 nla_put_failure: 325 genlmsg_cancel(msg, hdr); 326 free_msg: 327 nlmsg_free(msg); 328 return -EMSGSIZE; 329 } 330 331 int nfc_genl_device_removed(struct nfc_dev *dev) 332 { 333 struct sk_buff *msg; 334 void *hdr; 335 336 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 337 if (!msg) 338 return -ENOMEM; 339 340 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 341 NFC_EVENT_DEVICE_REMOVED); 342 if (!hdr) 343 goto free_msg; 344 345 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 346 goto nla_put_failure; 347 348 genlmsg_end(msg, hdr); 349 350 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); 351 352 return 0; 353 354 nla_put_failure: 355 genlmsg_cancel(msg, hdr); 356 free_msg: 357 nlmsg_free(msg); 358 return -EMSGSIZE; 359 } 360 361 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list) 362 { 363 struct sk_buff *msg; 364 struct nlattr *sdp_attr, *uri_attr; 365 struct nfc_llcp_sdp_tlv *sdres; 366 struct hlist_node *n; 367 void *hdr; 368 int rc = -EMSGSIZE; 369 int i; 370 371 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 372 if (!msg) 373 return -ENOMEM; 374 375 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 376 NFC_EVENT_LLC_SDRES); 377 if (!hdr) 378 goto free_msg; 379 380 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 381 goto nla_put_failure; 382 383 sdp_attr = nla_nest_start(msg, NFC_ATTR_LLC_SDP); 384 if (sdp_attr == NULL) { 385 rc = -ENOMEM; 386 goto nla_put_failure; 387 } 388 389 i = 1; 390 hlist_for_each_entry_safe(sdres, n, sdres_list, node) { 391 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap); 392 393 uri_attr = nla_nest_start(msg, i++); 394 if (uri_attr == NULL) { 395 rc = -ENOMEM; 396 goto nla_put_failure; 397 } 398 399 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap)) 400 goto nla_put_failure; 401 402 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri)) 403 goto nla_put_failure; 404 405 nla_nest_end(msg, uri_attr); 406 407 hlist_del(&sdres->node); 408 409 nfc_llcp_free_sdp_tlv(sdres); 410 } 411 412 nla_nest_end(msg, sdp_attr); 413 414 genlmsg_end(msg, hdr); 415 416 return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC); 417 418 nla_put_failure: 419 genlmsg_cancel(msg, hdr); 420 421 free_msg: 422 nlmsg_free(msg); 423 424 nfc_llcp_free_sdp_tlv_list(sdres_list); 425 426 return rc; 427 } 428 429 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type) 430 { 431 struct sk_buff *msg; 432 void *hdr; 433 434 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 435 if (!msg) 436 return -ENOMEM; 437 438 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 439 NFC_EVENT_SE_ADDED); 440 if (!hdr) 441 goto free_msg; 442 443 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 444 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) || 445 nla_put_u8(msg, NFC_ATTR_SE_TYPE, type)) 446 goto nla_put_failure; 447 448 genlmsg_end(msg, hdr); 449 450 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); 451 452 return 0; 453 454 nla_put_failure: 455 genlmsg_cancel(msg, hdr); 456 free_msg: 457 nlmsg_free(msg); 458 return -EMSGSIZE; 459 } 460 461 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx) 462 { 463 struct sk_buff *msg; 464 void *hdr; 465 466 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 467 if (!msg) 468 return -ENOMEM; 469 470 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 471 NFC_EVENT_SE_REMOVED); 472 if (!hdr) 473 goto free_msg; 474 475 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 476 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx)) 477 goto nla_put_failure; 478 479 genlmsg_end(msg, hdr); 480 481 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); 482 483 return 0; 484 485 nla_put_failure: 486 genlmsg_cancel(msg, hdr); 487 free_msg: 488 nlmsg_free(msg); 489 return -EMSGSIZE; 490 } 491 492 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev, 493 u32 portid, u32 seq, 494 struct netlink_callback *cb, 495 int flags) 496 { 497 void *hdr; 498 499 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags, 500 NFC_CMD_GET_DEVICE); 501 if (!hdr) 502 return -EMSGSIZE; 503 504 if (cb) 505 genl_dump_check_consistent(cb, hdr, &nfc_genl_family); 506 507 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) || 508 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 509 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) || 510 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) || 511 nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode)) 512 goto nla_put_failure; 513 514 return genlmsg_end(msg, hdr); 515 516 nla_put_failure: 517 genlmsg_cancel(msg, hdr); 518 return -EMSGSIZE; 519 } 520 521 static int nfc_genl_dump_devices(struct sk_buff *skb, 522 struct netlink_callback *cb) 523 { 524 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 525 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; 526 bool first_call = false; 527 528 if (!iter) { 529 first_call = true; 530 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL); 531 if (!iter) 532 return -ENOMEM; 533 cb->args[0] = (long) iter; 534 } 535 536 mutex_lock(&nfc_devlist_mutex); 537 538 cb->seq = nfc_devlist_generation; 539 540 if (first_call) { 541 nfc_device_iter_init(iter); 542 dev = nfc_device_iter_next(iter); 543 } 544 545 while (dev) { 546 int rc; 547 548 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid, 549 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI); 550 if (rc < 0) 551 break; 552 553 dev = nfc_device_iter_next(iter); 554 } 555 556 mutex_unlock(&nfc_devlist_mutex); 557 558 cb->args[1] = (long) dev; 559 560 return skb->len; 561 } 562 563 static int nfc_genl_dump_devices_done(struct netlink_callback *cb) 564 { 565 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 566 567 nfc_device_iter_exit(iter); 568 kfree(iter); 569 570 return 0; 571 } 572 573 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx, 574 u8 comm_mode, u8 rf_mode) 575 { 576 struct sk_buff *msg; 577 void *hdr; 578 579 pr_debug("DEP link is up\n"); 580 581 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 582 if (!msg) 583 return -ENOMEM; 584 585 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP); 586 if (!hdr) 587 goto free_msg; 588 589 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 590 goto nla_put_failure; 591 if (rf_mode == NFC_RF_INITIATOR && 592 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx)) 593 goto nla_put_failure; 594 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) || 595 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode)) 596 goto nla_put_failure; 597 598 genlmsg_end(msg, hdr); 599 600 dev->dep_link_up = true; 601 602 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC); 603 604 return 0; 605 606 nla_put_failure: 607 genlmsg_cancel(msg, hdr); 608 free_msg: 609 nlmsg_free(msg); 610 return -EMSGSIZE; 611 } 612 613 int nfc_genl_dep_link_down_event(struct nfc_dev *dev) 614 { 615 struct sk_buff *msg; 616 void *hdr; 617 618 pr_debug("DEP link is down\n"); 619 620 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 621 if (!msg) 622 return -ENOMEM; 623 624 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 625 NFC_CMD_DEP_LINK_DOWN); 626 if (!hdr) 627 goto free_msg; 628 629 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 630 goto nla_put_failure; 631 632 genlmsg_end(msg, hdr); 633 634 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC); 635 636 return 0; 637 638 nla_put_failure: 639 genlmsg_cancel(msg, hdr); 640 free_msg: 641 nlmsg_free(msg); 642 return -EMSGSIZE; 643 } 644 645 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info) 646 { 647 struct sk_buff *msg; 648 struct nfc_dev *dev; 649 u32 idx; 650 int rc = -ENOBUFS; 651 652 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 653 return -EINVAL; 654 655 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 656 657 dev = nfc_get_device(idx); 658 if (!dev) 659 return -ENODEV; 660 661 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 662 if (!msg) { 663 rc = -ENOMEM; 664 goto out_putdev; 665 } 666 667 rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq, 668 NULL, 0); 669 if (rc < 0) 670 goto out_free; 671 672 nfc_put_device(dev); 673 674 return genlmsg_reply(msg, info); 675 676 out_free: 677 nlmsg_free(msg); 678 out_putdev: 679 nfc_put_device(dev); 680 return rc; 681 } 682 683 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info) 684 { 685 struct nfc_dev *dev; 686 int rc; 687 u32 idx; 688 689 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 690 return -EINVAL; 691 692 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 693 694 dev = nfc_get_device(idx); 695 if (!dev) 696 return -ENODEV; 697 698 rc = nfc_dev_up(dev); 699 700 nfc_put_device(dev); 701 return rc; 702 } 703 704 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info) 705 { 706 struct nfc_dev *dev; 707 int rc; 708 u32 idx; 709 710 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 711 return -EINVAL; 712 713 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 714 715 dev = nfc_get_device(idx); 716 if (!dev) 717 return -ENODEV; 718 719 rc = nfc_dev_down(dev); 720 721 nfc_put_device(dev); 722 return rc; 723 } 724 725 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info) 726 { 727 struct nfc_dev *dev; 728 int rc; 729 u32 idx; 730 u32 im_protocols = 0, tm_protocols = 0; 731 732 pr_debug("Poll start\n"); 733 734 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 735 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] && 736 !info->attrs[NFC_ATTR_PROTOCOLS]) && 737 !info->attrs[NFC_ATTR_TM_PROTOCOLS])) 738 return -EINVAL; 739 740 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 741 742 if (info->attrs[NFC_ATTR_TM_PROTOCOLS]) 743 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]); 744 745 if (info->attrs[NFC_ATTR_IM_PROTOCOLS]) 746 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]); 747 else if (info->attrs[NFC_ATTR_PROTOCOLS]) 748 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]); 749 750 dev = nfc_get_device(idx); 751 if (!dev) 752 return -ENODEV; 753 754 mutex_lock(&dev->genl_data.genl_data_mutex); 755 756 rc = nfc_start_poll(dev, im_protocols, tm_protocols); 757 if (!rc) 758 dev->genl_data.poll_req_portid = info->snd_portid; 759 760 mutex_unlock(&dev->genl_data.genl_data_mutex); 761 762 nfc_put_device(dev); 763 return rc; 764 } 765 766 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info) 767 { 768 struct nfc_dev *dev; 769 int rc; 770 u32 idx; 771 772 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 773 return -EINVAL; 774 775 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 776 777 dev = nfc_get_device(idx); 778 if (!dev) 779 return -ENODEV; 780 781 device_lock(&dev->dev); 782 783 if (!dev->polling) { 784 device_unlock(&dev->dev); 785 return -EINVAL; 786 } 787 788 device_unlock(&dev->dev); 789 790 mutex_lock(&dev->genl_data.genl_data_mutex); 791 792 if (dev->genl_data.poll_req_portid != info->snd_portid) { 793 rc = -EBUSY; 794 goto out; 795 } 796 797 rc = nfc_stop_poll(dev); 798 dev->genl_data.poll_req_portid = 0; 799 800 out: 801 mutex_unlock(&dev->genl_data.genl_data_mutex); 802 nfc_put_device(dev); 803 return rc; 804 } 805 806 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info) 807 { 808 struct nfc_dev *dev; 809 int rc, tgt_idx; 810 u32 idx; 811 u8 comm; 812 813 pr_debug("DEP link up\n"); 814 815 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 816 !info->attrs[NFC_ATTR_COMM_MODE]) 817 return -EINVAL; 818 819 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 820 if (!info->attrs[NFC_ATTR_TARGET_INDEX]) 821 tgt_idx = NFC_TARGET_IDX_ANY; 822 else 823 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]); 824 825 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]); 826 827 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE) 828 return -EINVAL; 829 830 dev = nfc_get_device(idx); 831 if (!dev) 832 return -ENODEV; 833 834 rc = nfc_dep_link_up(dev, tgt_idx, comm); 835 836 nfc_put_device(dev); 837 838 return rc; 839 } 840 841 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info) 842 { 843 struct nfc_dev *dev; 844 int rc; 845 u32 idx; 846 847 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 848 return -EINVAL; 849 850 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 851 852 dev = nfc_get_device(idx); 853 if (!dev) 854 return -ENODEV; 855 856 rc = nfc_dep_link_down(dev); 857 858 nfc_put_device(dev); 859 return rc; 860 } 861 862 static int nfc_genl_send_params(struct sk_buff *msg, 863 struct nfc_llcp_local *local, 864 u32 portid, u32 seq) 865 { 866 void *hdr; 867 868 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0, 869 NFC_CMD_LLC_GET_PARAMS); 870 if (!hdr) 871 return -EMSGSIZE; 872 873 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) || 874 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) || 875 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) || 876 nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux))) 877 goto nla_put_failure; 878 879 return genlmsg_end(msg, hdr); 880 881 nla_put_failure: 882 883 genlmsg_cancel(msg, hdr); 884 return -EMSGSIZE; 885 } 886 887 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info) 888 { 889 struct nfc_dev *dev; 890 struct nfc_llcp_local *local; 891 int rc = 0; 892 struct sk_buff *msg = NULL; 893 u32 idx; 894 895 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 896 return -EINVAL; 897 898 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 899 900 dev = nfc_get_device(idx); 901 if (!dev) 902 return -ENODEV; 903 904 device_lock(&dev->dev); 905 906 local = nfc_llcp_find_local(dev); 907 if (!local) { 908 rc = -ENODEV; 909 goto exit; 910 } 911 912 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 913 if (!msg) { 914 rc = -ENOMEM; 915 goto exit; 916 } 917 918 rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq); 919 920 exit: 921 device_unlock(&dev->dev); 922 923 nfc_put_device(dev); 924 925 if (rc < 0) { 926 if (msg) 927 nlmsg_free(msg); 928 929 return rc; 930 } 931 932 return genlmsg_reply(msg, info); 933 } 934 935 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info) 936 { 937 struct nfc_dev *dev; 938 struct nfc_llcp_local *local; 939 u8 rw = 0; 940 u16 miux = 0; 941 u32 idx; 942 int rc = 0; 943 944 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 945 (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] && 946 !info->attrs[NFC_ATTR_LLC_PARAM_RW] && 947 !info->attrs[NFC_ATTR_LLC_PARAM_MIUX])) 948 return -EINVAL; 949 950 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) { 951 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]); 952 953 if (rw > LLCP_MAX_RW) 954 return -EINVAL; 955 } 956 957 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) { 958 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]); 959 960 if (miux > LLCP_MAX_MIUX) 961 return -EINVAL; 962 } 963 964 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 965 966 dev = nfc_get_device(idx); 967 if (!dev) 968 return -ENODEV; 969 970 device_lock(&dev->dev); 971 972 local = nfc_llcp_find_local(dev); 973 if (!local) { 974 nfc_put_device(dev); 975 rc = -ENODEV; 976 goto exit; 977 } 978 979 if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) { 980 if (dev->dep_link_up) { 981 rc = -EINPROGRESS; 982 goto exit; 983 } 984 985 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]); 986 } 987 988 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) 989 local->rw = rw; 990 991 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) 992 local->miux = cpu_to_be16(miux); 993 994 exit: 995 device_unlock(&dev->dev); 996 997 nfc_put_device(dev); 998 999 return rc; 1000 } 1001 1002 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info) 1003 { 1004 struct nfc_dev *dev; 1005 struct nfc_llcp_local *local; 1006 struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1]; 1007 u32 idx; 1008 u8 tid; 1009 char *uri; 1010 int rc = 0, rem; 1011 size_t uri_len, tlvs_len; 1012 struct hlist_head sdreq_list; 1013 struct nfc_llcp_sdp_tlv *sdreq; 1014 1015 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1016 !info->attrs[NFC_ATTR_LLC_SDP]) 1017 return -EINVAL; 1018 1019 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1020 1021 dev = nfc_get_device(idx); 1022 if (!dev) { 1023 rc = -ENODEV; 1024 goto exit; 1025 } 1026 1027 device_lock(&dev->dev); 1028 1029 if (dev->dep_link_up == false) { 1030 rc = -ENOLINK; 1031 goto exit; 1032 } 1033 1034 local = nfc_llcp_find_local(dev); 1035 if (!local) { 1036 nfc_put_device(dev); 1037 rc = -ENODEV; 1038 goto exit; 1039 } 1040 1041 INIT_HLIST_HEAD(&sdreq_list); 1042 1043 tlvs_len = 0; 1044 1045 nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) { 1046 rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr, 1047 nfc_sdp_genl_policy); 1048 1049 if (rc != 0) { 1050 rc = -EINVAL; 1051 goto exit; 1052 } 1053 1054 if (!sdp_attrs[NFC_SDP_ATTR_URI]) 1055 continue; 1056 1057 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]); 1058 if (uri_len == 0) 1059 continue; 1060 1061 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]); 1062 if (uri == NULL || *uri == 0) 1063 continue; 1064 1065 tid = local->sdreq_next_tid++; 1066 1067 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len); 1068 if (sdreq == NULL) { 1069 rc = -ENOMEM; 1070 goto exit; 1071 } 1072 1073 tlvs_len += sdreq->tlv_len; 1074 1075 hlist_add_head(&sdreq->node, &sdreq_list); 1076 } 1077 1078 if (hlist_empty(&sdreq_list)) { 1079 rc = -EINVAL; 1080 goto exit; 1081 } 1082 1083 rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len); 1084 exit: 1085 device_unlock(&dev->dev); 1086 1087 nfc_put_device(dev); 1088 1089 return rc; 1090 } 1091 1092 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info) 1093 { 1094 struct nfc_dev *dev; 1095 int rc; 1096 u32 idx; 1097 char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1]; 1098 1099 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 1100 return -EINVAL; 1101 1102 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1103 1104 dev = nfc_get_device(idx); 1105 if (!dev) 1106 return -ENODEV; 1107 1108 nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME], 1109 sizeof(firmware_name)); 1110 1111 rc = nfc_fw_download(dev, firmware_name); 1112 1113 nfc_put_device(dev); 1114 return rc; 1115 } 1116 1117 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name, 1118 u32 result) 1119 { 1120 struct sk_buff *msg; 1121 void *hdr; 1122 1123 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1124 if (!msg) 1125 return -ENOMEM; 1126 1127 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 1128 NFC_CMD_FW_DOWNLOAD); 1129 if (!hdr) 1130 goto free_msg; 1131 1132 if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) || 1133 nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) || 1134 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 1135 goto nla_put_failure; 1136 1137 genlmsg_end(msg, hdr); 1138 1139 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); 1140 1141 return 0; 1142 1143 nla_put_failure: 1144 genlmsg_cancel(msg, hdr); 1145 free_msg: 1146 nlmsg_free(msg); 1147 return -EMSGSIZE; 1148 } 1149 1150 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info) 1151 { 1152 struct nfc_dev *dev; 1153 int rc; 1154 u32 idx, se_idx; 1155 1156 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1157 !info->attrs[NFC_ATTR_SE_INDEX]) 1158 return -EINVAL; 1159 1160 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1161 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]); 1162 1163 dev = nfc_get_device(idx); 1164 if (!dev) 1165 return -ENODEV; 1166 1167 rc = nfc_enable_se(dev, se_idx); 1168 1169 nfc_put_device(dev); 1170 return rc; 1171 } 1172 1173 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info) 1174 { 1175 struct nfc_dev *dev; 1176 int rc; 1177 u32 idx, se_idx; 1178 1179 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1180 !info->attrs[NFC_ATTR_SE_INDEX]) 1181 return -EINVAL; 1182 1183 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1184 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]); 1185 1186 dev = nfc_get_device(idx); 1187 if (!dev) 1188 return -ENODEV; 1189 1190 rc = nfc_disable_se(dev, se_idx); 1191 1192 nfc_put_device(dev); 1193 return rc; 1194 } 1195 1196 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev, 1197 u32 portid, u32 seq, 1198 struct netlink_callback *cb, 1199 int flags) 1200 { 1201 void *hdr; 1202 struct nfc_se *se, *n; 1203 1204 list_for_each_entry_safe(se, n, &dev->secure_elements, list) { 1205 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags, 1206 NFC_CMD_GET_SE); 1207 if (!hdr) 1208 goto nla_put_failure; 1209 1210 if (cb) 1211 genl_dump_check_consistent(cb, hdr, &nfc_genl_family); 1212 1213 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 1214 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) || 1215 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type)) 1216 goto nla_put_failure; 1217 1218 if (genlmsg_end(msg, hdr) < 0) 1219 goto nla_put_failure; 1220 } 1221 1222 return 0; 1223 1224 nla_put_failure: 1225 genlmsg_cancel(msg, hdr); 1226 return -EMSGSIZE; 1227 } 1228 1229 static int nfc_genl_dump_ses(struct sk_buff *skb, 1230 struct netlink_callback *cb) 1231 { 1232 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 1233 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; 1234 bool first_call = false; 1235 1236 if (!iter) { 1237 first_call = true; 1238 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL); 1239 if (!iter) 1240 return -ENOMEM; 1241 cb->args[0] = (long) iter; 1242 } 1243 1244 mutex_lock(&nfc_devlist_mutex); 1245 1246 cb->seq = nfc_devlist_generation; 1247 1248 if (first_call) { 1249 nfc_device_iter_init(iter); 1250 dev = nfc_device_iter_next(iter); 1251 } 1252 1253 while (dev) { 1254 int rc; 1255 1256 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid, 1257 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI); 1258 if (rc < 0) 1259 break; 1260 1261 dev = nfc_device_iter_next(iter); 1262 } 1263 1264 mutex_unlock(&nfc_devlist_mutex); 1265 1266 cb->args[1] = (long) dev; 1267 1268 return skb->len; 1269 } 1270 1271 static int nfc_genl_dump_ses_done(struct netlink_callback *cb) 1272 { 1273 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 1274 1275 nfc_device_iter_exit(iter); 1276 kfree(iter); 1277 1278 return 0; 1279 } 1280 1281 static struct genl_ops nfc_genl_ops[] = { 1282 { 1283 .cmd = NFC_CMD_GET_DEVICE, 1284 .doit = nfc_genl_get_device, 1285 .dumpit = nfc_genl_dump_devices, 1286 .done = nfc_genl_dump_devices_done, 1287 .policy = nfc_genl_policy, 1288 }, 1289 { 1290 .cmd = NFC_CMD_DEV_UP, 1291 .doit = nfc_genl_dev_up, 1292 .policy = nfc_genl_policy, 1293 }, 1294 { 1295 .cmd = NFC_CMD_DEV_DOWN, 1296 .doit = nfc_genl_dev_down, 1297 .policy = nfc_genl_policy, 1298 }, 1299 { 1300 .cmd = NFC_CMD_START_POLL, 1301 .doit = nfc_genl_start_poll, 1302 .policy = nfc_genl_policy, 1303 }, 1304 { 1305 .cmd = NFC_CMD_STOP_POLL, 1306 .doit = nfc_genl_stop_poll, 1307 .policy = nfc_genl_policy, 1308 }, 1309 { 1310 .cmd = NFC_CMD_DEP_LINK_UP, 1311 .doit = nfc_genl_dep_link_up, 1312 .policy = nfc_genl_policy, 1313 }, 1314 { 1315 .cmd = NFC_CMD_DEP_LINK_DOWN, 1316 .doit = nfc_genl_dep_link_down, 1317 .policy = nfc_genl_policy, 1318 }, 1319 { 1320 .cmd = NFC_CMD_GET_TARGET, 1321 .dumpit = nfc_genl_dump_targets, 1322 .done = nfc_genl_dump_targets_done, 1323 .policy = nfc_genl_policy, 1324 }, 1325 { 1326 .cmd = NFC_CMD_LLC_GET_PARAMS, 1327 .doit = nfc_genl_llc_get_params, 1328 .policy = nfc_genl_policy, 1329 }, 1330 { 1331 .cmd = NFC_CMD_LLC_SET_PARAMS, 1332 .doit = nfc_genl_llc_set_params, 1333 .policy = nfc_genl_policy, 1334 }, 1335 { 1336 .cmd = NFC_CMD_LLC_SDREQ, 1337 .doit = nfc_genl_llc_sdreq, 1338 .policy = nfc_genl_policy, 1339 }, 1340 { 1341 .cmd = NFC_CMD_FW_DOWNLOAD, 1342 .doit = nfc_genl_fw_download, 1343 .policy = nfc_genl_policy, 1344 }, 1345 { 1346 .cmd = NFC_CMD_ENABLE_SE, 1347 .doit = nfc_genl_enable_se, 1348 .policy = nfc_genl_policy, 1349 }, 1350 { 1351 .cmd = NFC_CMD_DISABLE_SE, 1352 .doit = nfc_genl_disable_se, 1353 .policy = nfc_genl_policy, 1354 }, 1355 { 1356 .cmd = NFC_CMD_GET_SE, 1357 .dumpit = nfc_genl_dump_ses, 1358 .done = nfc_genl_dump_ses_done, 1359 .policy = nfc_genl_policy, 1360 }, 1361 }; 1362 1363 1364 struct urelease_work { 1365 struct work_struct w; 1366 int portid; 1367 }; 1368 1369 static void nfc_urelease_event_work(struct work_struct *work) 1370 { 1371 struct urelease_work *w = container_of(work, struct urelease_work, w); 1372 struct class_dev_iter iter; 1373 struct nfc_dev *dev; 1374 1375 pr_debug("portid %d\n", w->portid); 1376 1377 mutex_lock(&nfc_devlist_mutex); 1378 1379 nfc_device_iter_init(&iter); 1380 dev = nfc_device_iter_next(&iter); 1381 1382 while (dev) { 1383 mutex_lock(&dev->genl_data.genl_data_mutex); 1384 1385 if (dev->genl_data.poll_req_portid == w->portid) { 1386 nfc_stop_poll(dev); 1387 dev->genl_data.poll_req_portid = 0; 1388 } 1389 1390 mutex_unlock(&dev->genl_data.genl_data_mutex); 1391 1392 dev = nfc_device_iter_next(&iter); 1393 } 1394 1395 nfc_device_iter_exit(&iter); 1396 1397 mutex_unlock(&nfc_devlist_mutex); 1398 1399 kfree(w); 1400 } 1401 1402 static int nfc_genl_rcv_nl_event(struct notifier_block *this, 1403 unsigned long event, void *ptr) 1404 { 1405 struct netlink_notify *n = ptr; 1406 struct urelease_work *w; 1407 1408 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC) 1409 goto out; 1410 1411 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid); 1412 1413 w = kmalloc(sizeof(*w), GFP_ATOMIC); 1414 if (w) { 1415 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work); 1416 w->portid = n->portid; 1417 schedule_work((struct work_struct *) w); 1418 } 1419 1420 out: 1421 return NOTIFY_DONE; 1422 } 1423 1424 void nfc_genl_data_init(struct nfc_genl_data *genl_data) 1425 { 1426 genl_data->poll_req_portid = 0; 1427 mutex_init(&genl_data->genl_data_mutex); 1428 } 1429 1430 void nfc_genl_data_exit(struct nfc_genl_data *genl_data) 1431 { 1432 mutex_destroy(&genl_data->genl_data_mutex); 1433 } 1434 1435 static struct notifier_block nl_notifier = { 1436 .notifier_call = nfc_genl_rcv_nl_event, 1437 }; 1438 1439 /** 1440 * nfc_genl_init() - Initialize netlink interface 1441 * 1442 * This initialization function registers the nfc netlink family. 1443 */ 1444 int __init nfc_genl_init(void) 1445 { 1446 int rc; 1447 1448 rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops, 1449 ARRAY_SIZE(nfc_genl_ops)); 1450 if (rc) 1451 return rc; 1452 1453 rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp); 1454 1455 netlink_register_notifier(&nl_notifier); 1456 1457 return rc; 1458 } 1459 1460 /** 1461 * nfc_genl_exit() - Deinitialize netlink interface 1462 * 1463 * This exit function unregisters the nfc netlink family. 1464 */ 1465 void nfc_genl_exit(void) 1466 { 1467 netlink_unregister_notifier(&nl_notifier); 1468 genl_unregister_family(&nfc_genl_family); 1469 } 1470