1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2011 Instituto Nokia de Tecnologia 4 * 5 * Authors: 6 * Lauro Ramos Venancio <lauro.venancio@openbossa.org> 7 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org> 8 * 9 * Vendor commands implementation based on net/wireless/nl80211.c 10 * which is: 11 * 12 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> 13 * Copyright 2013-2014 Intel Mobile Communications GmbH 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 17 18 #include <net/genetlink.h> 19 #include <linux/nfc.h> 20 #include <linux/slab.h> 21 22 #include "nfc.h" 23 #include "llcp.h" 24 25 static const struct genl_multicast_group nfc_genl_mcgrps[] = { 26 { .name = NFC_GENL_MCAST_EVENT_NAME, }, 27 }; 28 29 static struct genl_family nfc_genl_family; 30 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = { 31 [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 }, 32 [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING, 33 .len = NFC_DEVICE_NAME_MAXSIZE }, 34 [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 }, 35 [NFC_ATTR_TARGET_INDEX] = { .type = NLA_U32 }, 36 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 }, 37 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 }, 38 [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 }, 39 [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 }, 40 [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 }, 41 [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 }, 42 [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 }, 43 [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 }, 44 [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED }, 45 [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING, 46 .len = NFC_FIRMWARE_NAME_MAXSIZE }, 47 [NFC_ATTR_SE_INDEX] = { .type = NLA_U32 }, 48 [NFC_ATTR_SE_APDU] = { .type = NLA_BINARY }, 49 [NFC_ATTR_VENDOR_ID] = { .type = NLA_U32 }, 50 [NFC_ATTR_VENDOR_SUBCMD] = { .type = NLA_U32 }, 51 [NFC_ATTR_VENDOR_DATA] = { .type = NLA_BINARY }, 52 53 }; 54 55 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = { 56 [NFC_SDP_ATTR_URI] = { .type = NLA_STRING, 57 .len = U8_MAX - 4 }, 58 [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 }, 59 }; 60 61 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target, 62 struct netlink_callback *cb, int flags) 63 { 64 void *hdr; 65 66 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 67 &nfc_genl_family, flags, NFC_CMD_GET_TARGET); 68 if (!hdr) 69 return -EMSGSIZE; 70 71 genl_dump_check_consistent(cb, hdr); 72 73 if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) || 74 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) || 75 nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) || 76 nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res)) 77 goto nla_put_failure; 78 if (target->nfcid1_len > 0 && 79 nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len, 80 target->nfcid1)) 81 goto nla_put_failure; 82 if (target->sensb_res_len > 0 && 83 nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len, 84 target->sensb_res)) 85 goto nla_put_failure; 86 if (target->sensf_res_len > 0 && 87 nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len, 88 target->sensf_res)) 89 goto nla_put_failure; 90 91 if (target->is_iso15693) { 92 if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID, 93 target->iso15693_dsfid) || 94 nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID, 95 sizeof(target->iso15693_uid), target->iso15693_uid)) 96 goto nla_put_failure; 97 } 98 99 genlmsg_end(msg, hdr); 100 return 0; 101 102 nla_put_failure: 103 genlmsg_cancel(msg, hdr); 104 return -EMSGSIZE; 105 } 106 107 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb) 108 { 109 const struct genl_dumpit_info *info = genl_dumpit_info(cb); 110 struct nfc_dev *dev; 111 u32 idx; 112 113 if (!info->info.attrs[NFC_ATTR_DEVICE_INDEX]) 114 return ERR_PTR(-EINVAL); 115 116 idx = nla_get_u32(info->info.attrs[NFC_ATTR_DEVICE_INDEX]); 117 118 dev = nfc_get_device(idx); 119 if (!dev) 120 return ERR_PTR(-ENODEV); 121 122 return dev; 123 } 124 125 static int nfc_genl_dump_targets(struct sk_buff *skb, 126 struct netlink_callback *cb) 127 { 128 int i = cb->args[0]; 129 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; 130 int rc; 131 132 if (!dev) { 133 dev = __get_device_from_cb(cb); 134 if (IS_ERR(dev)) 135 return PTR_ERR(dev); 136 137 cb->args[1] = (long) dev; 138 } 139 140 device_lock(&dev->dev); 141 142 cb->seq = dev->targets_generation; 143 144 while (i < dev->n_targets) { 145 rc = nfc_genl_send_target(skb, &dev->targets[i], cb, 146 NLM_F_MULTI); 147 if (rc < 0) 148 break; 149 150 i++; 151 } 152 153 device_unlock(&dev->dev); 154 155 cb->args[0] = i; 156 157 return skb->len; 158 } 159 160 static int nfc_genl_dump_targets_done(struct netlink_callback *cb) 161 { 162 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; 163 164 if (dev) 165 nfc_put_device(dev); 166 167 return 0; 168 } 169 170 int nfc_genl_targets_found(struct nfc_dev *dev) 171 { 172 struct sk_buff *msg; 173 void *hdr; 174 175 dev->genl_data.poll_req_portid = 0; 176 177 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 178 if (!msg) 179 return -ENOMEM; 180 181 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 182 NFC_EVENT_TARGETS_FOUND); 183 if (!hdr) 184 goto free_msg; 185 186 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 187 goto nla_put_failure; 188 189 genlmsg_end(msg, hdr); 190 191 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC); 192 193 nla_put_failure: 194 free_msg: 195 nlmsg_free(msg); 196 return -EMSGSIZE; 197 } 198 199 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx) 200 { 201 struct sk_buff *msg; 202 void *hdr; 203 204 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 205 if (!msg) 206 return -ENOMEM; 207 208 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 209 NFC_EVENT_TARGET_LOST); 210 if (!hdr) 211 goto free_msg; 212 213 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) || 214 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx)) 215 goto nla_put_failure; 216 217 genlmsg_end(msg, hdr); 218 219 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 220 221 return 0; 222 223 nla_put_failure: 224 free_msg: 225 nlmsg_free(msg); 226 return -EMSGSIZE; 227 } 228 229 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol) 230 { 231 struct sk_buff *msg; 232 void *hdr; 233 234 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 235 if (!msg) 236 return -ENOMEM; 237 238 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 239 NFC_EVENT_TM_ACTIVATED); 240 if (!hdr) 241 goto free_msg; 242 243 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 244 goto nla_put_failure; 245 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol)) 246 goto nla_put_failure; 247 248 genlmsg_end(msg, hdr); 249 250 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 251 252 return 0; 253 254 nla_put_failure: 255 free_msg: 256 nlmsg_free(msg); 257 return -EMSGSIZE; 258 } 259 260 int nfc_genl_tm_deactivated(struct nfc_dev *dev) 261 { 262 struct sk_buff *msg; 263 void *hdr; 264 265 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 266 if (!msg) 267 return -ENOMEM; 268 269 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 270 NFC_EVENT_TM_DEACTIVATED); 271 if (!hdr) 272 goto free_msg; 273 274 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 275 goto nla_put_failure; 276 277 genlmsg_end(msg, hdr); 278 279 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 280 281 return 0; 282 283 nla_put_failure: 284 free_msg: 285 nlmsg_free(msg); 286 return -EMSGSIZE; 287 } 288 289 static int nfc_genl_setup_device_added(struct nfc_dev *dev, struct sk_buff *msg) 290 { 291 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) || 292 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 293 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) || 294 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) || 295 nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode)) 296 return -1; 297 return 0; 298 } 299 300 int nfc_genl_device_added(struct nfc_dev *dev) 301 { 302 struct sk_buff *msg; 303 void *hdr; 304 305 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 306 if (!msg) 307 return -ENOMEM; 308 309 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 310 NFC_EVENT_DEVICE_ADDED); 311 if (!hdr) 312 goto free_msg; 313 314 if (nfc_genl_setup_device_added(dev, msg)) 315 goto nla_put_failure; 316 317 genlmsg_end(msg, hdr); 318 319 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 320 321 return 0; 322 323 nla_put_failure: 324 free_msg: 325 nlmsg_free(msg); 326 return -EMSGSIZE; 327 } 328 329 int nfc_genl_device_removed(struct nfc_dev *dev) 330 { 331 struct sk_buff *msg; 332 void *hdr; 333 334 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 335 if (!msg) 336 return -ENOMEM; 337 338 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 339 NFC_EVENT_DEVICE_REMOVED); 340 if (!hdr) 341 goto free_msg; 342 343 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 344 goto nla_put_failure; 345 346 genlmsg_end(msg, hdr); 347 348 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 349 350 return 0; 351 352 nla_put_failure: 353 free_msg: 354 nlmsg_free(msg); 355 return -EMSGSIZE; 356 } 357 358 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list) 359 { 360 struct sk_buff *msg; 361 struct nlattr *sdp_attr, *uri_attr; 362 struct nfc_llcp_sdp_tlv *sdres; 363 struct hlist_node *n; 364 void *hdr; 365 int rc = -EMSGSIZE; 366 int i; 367 368 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 369 if (!msg) 370 return -ENOMEM; 371 372 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 373 NFC_EVENT_LLC_SDRES); 374 if (!hdr) 375 goto free_msg; 376 377 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 378 goto nla_put_failure; 379 380 sdp_attr = nla_nest_start_noflag(msg, NFC_ATTR_LLC_SDP); 381 if (sdp_attr == NULL) { 382 rc = -ENOMEM; 383 goto nla_put_failure; 384 } 385 386 i = 1; 387 hlist_for_each_entry_safe(sdres, n, sdres_list, node) { 388 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap); 389 390 uri_attr = nla_nest_start_noflag(msg, i++); 391 if (uri_attr == NULL) { 392 rc = -ENOMEM; 393 goto nla_put_failure; 394 } 395 396 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap)) 397 goto nla_put_failure; 398 399 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri)) 400 goto nla_put_failure; 401 402 nla_nest_end(msg, uri_attr); 403 404 hlist_del(&sdres->node); 405 406 nfc_llcp_free_sdp_tlv(sdres); 407 } 408 409 nla_nest_end(msg, sdp_attr); 410 411 genlmsg_end(msg, hdr); 412 413 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC); 414 415 nla_put_failure: 416 free_msg: 417 nlmsg_free(msg); 418 419 nfc_llcp_free_sdp_tlv_list(sdres_list); 420 421 return rc; 422 } 423 424 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type) 425 { 426 struct sk_buff *msg; 427 void *hdr; 428 429 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 430 if (!msg) 431 return -ENOMEM; 432 433 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 434 NFC_EVENT_SE_ADDED); 435 if (!hdr) 436 goto free_msg; 437 438 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 439 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) || 440 nla_put_u8(msg, NFC_ATTR_SE_TYPE, type)) 441 goto nla_put_failure; 442 443 genlmsg_end(msg, hdr); 444 445 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 446 447 return 0; 448 449 nla_put_failure: 450 free_msg: 451 nlmsg_free(msg); 452 return -EMSGSIZE; 453 } 454 455 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx) 456 { 457 struct sk_buff *msg; 458 void *hdr; 459 460 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 461 if (!msg) 462 return -ENOMEM; 463 464 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 465 NFC_EVENT_SE_REMOVED); 466 if (!hdr) 467 goto free_msg; 468 469 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 470 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx)) 471 goto nla_put_failure; 472 473 genlmsg_end(msg, hdr); 474 475 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 476 477 return 0; 478 479 nla_put_failure: 480 free_msg: 481 nlmsg_free(msg); 482 return -EMSGSIZE; 483 } 484 485 int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx, 486 struct nfc_evt_transaction *evt_transaction) 487 { 488 struct nfc_se *se; 489 struct sk_buff *msg; 490 void *hdr; 491 492 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 493 if (!msg) 494 return -ENOMEM; 495 496 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 497 NFC_EVENT_SE_TRANSACTION); 498 if (!hdr) 499 goto free_msg; 500 501 se = nfc_find_se(dev, se_idx); 502 if (!se) 503 goto free_msg; 504 505 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 506 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) || 507 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) || 508 nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len, 509 evt_transaction->aid) || 510 nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len, 511 evt_transaction->params)) 512 goto nla_put_failure; 513 514 /* evt_transaction is no more used */ 515 devm_kfree(&dev->dev, evt_transaction); 516 517 genlmsg_end(msg, hdr); 518 519 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 520 521 return 0; 522 523 nla_put_failure: 524 free_msg: 525 /* evt_transaction is no more used */ 526 devm_kfree(&dev->dev, evt_transaction); 527 nlmsg_free(msg); 528 return -EMSGSIZE; 529 } 530 531 int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx) 532 { 533 const struct nfc_se *se; 534 struct sk_buff *msg; 535 void *hdr; 536 537 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 538 if (!msg) 539 return -ENOMEM; 540 541 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 542 NFC_EVENT_SE_CONNECTIVITY); 543 if (!hdr) 544 goto free_msg; 545 546 se = nfc_find_se(dev, se_idx); 547 if (!se) 548 goto free_msg; 549 550 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 551 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) || 552 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type)) 553 goto nla_put_failure; 554 555 genlmsg_end(msg, hdr); 556 557 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 558 559 return 0; 560 561 nla_put_failure: 562 free_msg: 563 nlmsg_free(msg); 564 return -EMSGSIZE; 565 } 566 567 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev, 568 u32 portid, u32 seq, 569 struct netlink_callback *cb, 570 int flags) 571 { 572 void *hdr; 573 574 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags, 575 NFC_CMD_GET_DEVICE); 576 if (!hdr) 577 return -EMSGSIZE; 578 579 if (cb) 580 genl_dump_check_consistent(cb, hdr); 581 582 if (nfc_genl_setup_device_added(dev, msg)) 583 goto nla_put_failure; 584 585 genlmsg_end(msg, hdr); 586 return 0; 587 588 nla_put_failure: 589 genlmsg_cancel(msg, hdr); 590 return -EMSGSIZE; 591 } 592 593 static int nfc_genl_dump_devices(struct sk_buff *skb, 594 struct netlink_callback *cb) 595 { 596 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 597 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; 598 bool first_call = false; 599 600 if (!iter) { 601 first_call = true; 602 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL); 603 if (!iter) 604 return -ENOMEM; 605 cb->args[0] = (long) iter; 606 } 607 608 mutex_lock(&nfc_devlist_mutex); 609 610 cb->seq = nfc_devlist_generation; 611 612 if (first_call) { 613 nfc_device_iter_init(iter); 614 dev = nfc_device_iter_next(iter); 615 } 616 617 while (dev) { 618 int rc; 619 620 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid, 621 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI); 622 if (rc < 0) 623 break; 624 625 dev = nfc_device_iter_next(iter); 626 } 627 628 mutex_unlock(&nfc_devlist_mutex); 629 630 cb->args[1] = (long) dev; 631 632 return skb->len; 633 } 634 635 static int nfc_genl_dump_devices_done(struct netlink_callback *cb) 636 { 637 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 638 639 if (iter) { 640 nfc_device_iter_exit(iter); 641 kfree(iter); 642 } 643 644 return 0; 645 } 646 647 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx, 648 u8 comm_mode, u8 rf_mode) 649 { 650 struct sk_buff *msg; 651 void *hdr; 652 653 pr_debug("DEP link is up\n"); 654 655 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 656 if (!msg) 657 return -ENOMEM; 658 659 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP); 660 if (!hdr) 661 goto free_msg; 662 663 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 664 goto nla_put_failure; 665 if (rf_mode == NFC_RF_INITIATOR && 666 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx)) 667 goto nla_put_failure; 668 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) || 669 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode)) 670 goto nla_put_failure; 671 672 genlmsg_end(msg, hdr); 673 674 dev->dep_link_up = true; 675 676 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC); 677 678 return 0; 679 680 nla_put_failure: 681 free_msg: 682 nlmsg_free(msg); 683 return -EMSGSIZE; 684 } 685 686 int nfc_genl_dep_link_down_event(struct nfc_dev *dev) 687 { 688 struct sk_buff *msg; 689 void *hdr; 690 691 pr_debug("DEP link is down\n"); 692 693 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 694 if (!msg) 695 return -ENOMEM; 696 697 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 698 NFC_CMD_DEP_LINK_DOWN); 699 if (!hdr) 700 goto free_msg; 701 702 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 703 goto nla_put_failure; 704 705 genlmsg_end(msg, hdr); 706 707 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC); 708 709 return 0; 710 711 nla_put_failure: 712 free_msg: 713 nlmsg_free(msg); 714 return -EMSGSIZE; 715 } 716 717 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info) 718 { 719 struct sk_buff *msg; 720 struct nfc_dev *dev; 721 u32 idx; 722 int rc = -ENOBUFS; 723 724 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 725 return -EINVAL; 726 727 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 728 729 dev = nfc_get_device(idx); 730 if (!dev) 731 return -ENODEV; 732 733 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 734 if (!msg) { 735 rc = -ENOMEM; 736 goto out_putdev; 737 } 738 739 rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq, 740 NULL, 0); 741 if (rc < 0) 742 goto out_free; 743 744 nfc_put_device(dev); 745 746 return genlmsg_reply(msg, info); 747 748 out_free: 749 nlmsg_free(msg); 750 out_putdev: 751 nfc_put_device(dev); 752 return rc; 753 } 754 755 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info) 756 { 757 struct nfc_dev *dev; 758 int rc; 759 u32 idx; 760 761 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 762 return -EINVAL; 763 764 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 765 766 dev = nfc_get_device(idx); 767 if (!dev) 768 return -ENODEV; 769 770 rc = nfc_dev_up(dev); 771 772 nfc_put_device(dev); 773 return rc; 774 } 775 776 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info) 777 { 778 struct nfc_dev *dev; 779 int rc; 780 u32 idx; 781 782 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 783 return -EINVAL; 784 785 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 786 787 dev = nfc_get_device(idx); 788 if (!dev) 789 return -ENODEV; 790 791 rc = nfc_dev_down(dev); 792 793 nfc_put_device(dev); 794 return rc; 795 } 796 797 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info) 798 { 799 struct nfc_dev *dev; 800 int rc; 801 u32 idx; 802 u32 im_protocols = 0, tm_protocols = 0; 803 804 pr_debug("Poll start\n"); 805 806 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 807 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] && 808 !info->attrs[NFC_ATTR_PROTOCOLS]) && 809 !info->attrs[NFC_ATTR_TM_PROTOCOLS])) 810 return -EINVAL; 811 812 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 813 814 if (info->attrs[NFC_ATTR_TM_PROTOCOLS]) 815 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]); 816 817 if (info->attrs[NFC_ATTR_IM_PROTOCOLS]) 818 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]); 819 else if (info->attrs[NFC_ATTR_PROTOCOLS]) 820 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]); 821 822 dev = nfc_get_device(idx); 823 if (!dev) 824 return -ENODEV; 825 826 mutex_lock(&dev->genl_data.genl_data_mutex); 827 828 rc = nfc_start_poll(dev, im_protocols, tm_protocols); 829 if (!rc) 830 dev->genl_data.poll_req_portid = info->snd_portid; 831 832 mutex_unlock(&dev->genl_data.genl_data_mutex); 833 834 nfc_put_device(dev); 835 return rc; 836 } 837 838 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info) 839 { 840 struct nfc_dev *dev; 841 int rc; 842 u32 idx; 843 844 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 845 return -EINVAL; 846 847 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 848 849 dev = nfc_get_device(idx); 850 if (!dev) 851 return -ENODEV; 852 853 device_lock(&dev->dev); 854 855 if (!dev->polling) { 856 device_unlock(&dev->dev); 857 nfc_put_device(dev); 858 return -EINVAL; 859 } 860 861 device_unlock(&dev->dev); 862 863 mutex_lock(&dev->genl_data.genl_data_mutex); 864 865 if (dev->genl_data.poll_req_portid != info->snd_portid) { 866 rc = -EBUSY; 867 goto out; 868 } 869 870 rc = nfc_stop_poll(dev); 871 dev->genl_data.poll_req_portid = 0; 872 873 out: 874 mutex_unlock(&dev->genl_data.genl_data_mutex); 875 nfc_put_device(dev); 876 return rc; 877 } 878 879 static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info) 880 { 881 struct nfc_dev *dev; 882 u32 device_idx, target_idx, protocol; 883 int rc; 884 885 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 886 !info->attrs[NFC_ATTR_TARGET_INDEX] || 887 !info->attrs[NFC_ATTR_PROTOCOLS]) 888 return -EINVAL; 889 890 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 891 892 dev = nfc_get_device(device_idx); 893 if (!dev) 894 return -ENODEV; 895 896 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]); 897 protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]); 898 899 nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP); 900 rc = nfc_activate_target(dev, target_idx, protocol); 901 902 nfc_put_device(dev); 903 return rc; 904 } 905 906 static int nfc_genl_deactivate_target(struct sk_buff *skb, 907 struct genl_info *info) 908 { 909 struct nfc_dev *dev; 910 u32 device_idx, target_idx; 911 int rc; 912 913 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 914 !info->attrs[NFC_ATTR_TARGET_INDEX]) 915 return -EINVAL; 916 917 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 918 919 dev = nfc_get_device(device_idx); 920 if (!dev) 921 return -ENODEV; 922 923 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]); 924 925 rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP); 926 927 nfc_put_device(dev); 928 return rc; 929 } 930 931 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info) 932 { 933 struct nfc_dev *dev; 934 int rc, tgt_idx; 935 u32 idx; 936 u8 comm; 937 938 pr_debug("DEP link up\n"); 939 940 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 941 !info->attrs[NFC_ATTR_COMM_MODE]) 942 return -EINVAL; 943 944 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 945 if (!info->attrs[NFC_ATTR_TARGET_INDEX]) 946 tgt_idx = NFC_TARGET_IDX_ANY; 947 else 948 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]); 949 950 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]); 951 952 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE) 953 return -EINVAL; 954 955 dev = nfc_get_device(idx); 956 if (!dev) 957 return -ENODEV; 958 959 rc = nfc_dep_link_up(dev, tgt_idx, comm); 960 961 nfc_put_device(dev); 962 963 return rc; 964 } 965 966 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info) 967 { 968 struct nfc_dev *dev; 969 int rc; 970 u32 idx; 971 972 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 973 return -EINVAL; 974 975 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 976 977 dev = nfc_get_device(idx); 978 if (!dev) 979 return -ENODEV; 980 981 rc = nfc_dep_link_down(dev); 982 983 nfc_put_device(dev); 984 return rc; 985 } 986 987 static int nfc_genl_send_params(struct sk_buff *msg, 988 struct nfc_llcp_local *local, 989 u32 portid, u32 seq) 990 { 991 void *hdr; 992 993 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0, 994 NFC_CMD_LLC_GET_PARAMS); 995 if (!hdr) 996 return -EMSGSIZE; 997 998 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) || 999 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) || 1000 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) || 1001 nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux))) 1002 goto nla_put_failure; 1003 1004 genlmsg_end(msg, hdr); 1005 return 0; 1006 1007 nla_put_failure: 1008 genlmsg_cancel(msg, hdr); 1009 return -EMSGSIZE; 1010 } 1011 1012 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info) 1013 { 1014 struct nfc_dev *dev; 1015 struct nfc_llcp_local *local; 1016 int rc = 0; 1017 struct sk_buff *msg = NULL; 1018 u32 idx; 1019 1020 if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) 1021 return -EINVAL; 1022 1023 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1024 1025 dev = nfc_get_device(idx); 1026 if (!dev) 1027 return -ENODEV; 1028 1029 device_lock(&dev->dev); 1030 1031 local = nfc_llcp_find_local(dev); 1032 if (!local) { 1033 rc = -ENODEV; 1034 goto exit; 1035 } 1036 1037 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1038 if (!msg) { 1039 rc = -ENOMEM; 1040 goto put_local; 1041 } 1042 1043 rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq); 1044 1045 put_local: 1046 nfc_llcp_local_put(local); 1047 1048 exit: 1049 device_unlock(&dev->dev); 1050 1051 nfc_put_device(dev); 1052 1053 if (rc < 0) { 1054 if (msg) 1055 nlmsg_free(msg); 1056 1057 return rc; 1058 } 1059 1060 return genlmsg_reply(msg, info); 1061 } 1062 1063 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info) 1064 { 1065 struct nfc_dev *dev; 1066 struct nfc_llcp_local *local; 1067 u8 rw = 0; 1068 u16 miux = 0; 1069 u32 idx; 1070 int rc = 0; 1071 1072 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1073 (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] && 1074 !info->attrs[NFC_ATTR_LLC_PARAM_RW] && 1075 !info->attrs[NFC_ATTR_LLC_PARAM_MIUX])) 1076 return -EINVAL; 1077 1078 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) { 1079 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]); 1080 1081 if (rw > LLCP_MAX_RW) 1082 return -EINVAL; 1083 } 1084 1085 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) { 1086 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]); 1087 1088 if (miux > LLCP_MAX_MIUX) 1089 return -EINVAL; 1090 } 1091 1092 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1093 1094 dev = nfc_get_device(idx); 1095 if (!dev) 1096 return -ENODEV; 1097 1098 device_lock(&dev->dev); 1099 1100 local = nfc_llcp_find_local(dev); 1101 if (!local) { 1102 rc = -ENODEV; 1103 goto exit; 1104 } 1105 1106 if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) { 1107 if (dev->dep_link_up) { 1108 rc = -EINPROGRESS; 1109 goto put_local; 1110 } 1111 1112 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]); 1113 } 1114 1115 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) 1116 local->rw = rw; 1117 1118 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) 1119 local->miux = cpu_to_be16(miux); 1120 1121 put_local: 1122 nfc_llcp_local_put(local); 1123 1124 exit: 1125 device_unlock(&dev->dev); 1126 1127 nfc_put_device(dev); 1128 1129 return rc; 1130 } 1131 1132 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info) 1133 { 1134 struct nfc_dev *dev; 1135 struct nfc_llcp_local *local; 1136 struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1]; 1137 u32 idx; 1138 u8 tid; 1139 char *uri; 1140 int rc = 0, rem; 1141 size_t uri_len, tlvs_len; 1142 struct hlist_head sdreq_list; 1143 struct nfc_llcp_sdp_tlv *sdreq; 1144 1145 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1146 !info->attrs[NFC_ATTR_LLC_SDP]) 1147 return -EINVAL; 1148 1149 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1150 1151 dev = nfc_get_device(idx); 1152 if (!dev) 1153 return -ENODEV; 1154 1155 device_lock(&dev->dev); 1156 1157 if (dev->dep_link_up == false) { 1158 rc = -ENOLINK; 1159 goto exit; 1160 } 1161 1162 local = nfc_llcp_find_local(dev); 1163 if (!local) { 1164 rc = -ENODEV; 1165 goto exit; 1166 } 1167 1168 INIT_HLIST_HEAD(&sdreq_list); 1169 1170 tlvs_len = 0; 1171 1172 nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) { 1173 rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX, 1174 attr, nfc_sdp_genl_policy, 1175 info->extack); 1176 1177 if (rc != 0) { 1178 rc = -EINVAL; 1179 goto put_local; 1180 } 1181 1182 if (!sdp_attrs[NFC_SDP_ATTR_URI]) 1183 continue; 1184 1185 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]); 1186 if (uri_len == 0) 1187 continue; 1188 1189 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]); 1190 if (uri == NULL || *uri == 0) 1191 continue; 1192 1193 tid = local->sdreq_next_tid++; 1194 1195 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len); 1196 if (sdreq == NULL) { 1197 rc = -ENOMEM; 1198 goto put_local; 1199 } 1200 1201 tlvs_len += sdreq->tlv_len; 1202 1203 hlist_add_head(&sdreq->node, &sdreq_list); 1204 } 1205 1206 if (hlist_empty(&sdreq_list)) { 1207 rc = -EINVAL; 1208 goto put_local; 1209 } 1210 1211 rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len); 1212 1213 put_local: 1214 nfc_llcp_local_put(local); 1215 1216 exit: 1217 device_unlock(&dev->dev); 1218 1219 nfc_put_device(dev); 1220 1221 return rc; 1222 } 1223 1224 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info) 1225 { 1226 struct nfc_dev *dev; 1227 int rc; 1228 u32 idx; 1229 char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1]; 1230 1231 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME]) 1232 return -EINVAL; 1233 1234 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1235 1236 dev = nfc_get_device(idx); 1237 if (!dev) 1238 return -ENODEV; 1239 1240 nla_strscpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME], 1241 sizeof(firmware_name)); 1242 1243 rc = nfc_fw_download(dev, firmware_name); 1244 1245 nfc_put_device(dev); 1246 return rc; 1247 } 1248 1249 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name, 1250 u32 result) 1251 { 1252 struct sk_buff *msg; 1253 void *hdr; 1254 1255 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1256 if (!msg) 1257 return -ENOMEM; 1258 1259 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 1260 NFC_CMD_FW_DOWNLOAD); 1261 if (!hdr) 1262 goto free_msg; 1263 1264 if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) || 1265 nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) || 1266 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 1267 goto nla_put_failure; 1268 1269 genlmsg_end(msg, hdr); 1270 1271 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC); 1272 1273 return 0; 1274 1275 nla_put_failure: 1276 free_msg: 1277 nlmsg_free(msg); 1278 return -EMSGSIZE; 1279 } 1280 1281 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info) 1282 { 1283 struct nfc_dev *dev; 1284 int rc; 1285 u32 idx, se_idx; 1286 1287 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1288 !info->attrs[NFC_ATTR_SE_INDEX]) 1289 return -EINVAL; 1290 1291 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1292 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]); 1293 1294 dev = nfc_get_device(idx); 1295 if (!dev) 1296 return -ENODEV; 1297 1298 rc = nfc_enable_se(dev, se_idx); 1299 1300 nfc_put_device(dev); 1301 return rc; 1302 } 1303 1304 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info) 1305 { 1306 struct nfc_dev *dev; 1307 int rc; 1308 u32 idx, se_idx; 1309 1310 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1311 !info->attrs[NFC_ATTR_SE_INDEX]) 1312 return -EINVAL; 1313 1314 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1315 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]); 1316 1317 dev = nfc_get_device(idx); 1318 if (!dev) 1319 return -ENODEV; 1320 1321 rc = nfc_disable_se(dev, se_idx); 1322 1323 nfc_put_device(dev); 1324 return rc; 1325 } 1326 1327 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev, 1328 u32 portid, u32 seq, 1329 struct netlink_callback *cb, 1330 int flags) 1331 { 1332 void *hdr; 1333 struct nfc_se *se, *n; 1334 1335 list_for_each_entry_safe(se, n, &dev->secure_elements, list) { 1336 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags, 1337 NFC_CMD_GET_SE); 1338 if (!hdr) 1339 goto nla_put_failure; 1340 1341 if (cb) 1342 genl_dump_check_consistent(cb, hdr); 1343 1344 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 1345 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) || 1346 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type)) 1347 goto nla_put_failure; 1348 1349 genlmsg_end(msg, hdr); 1350 } 1351 1352 return 0; 1353 1354 nla_put_failure: 1355 genlmsg_cancel(msg, hdr); 1356 return -EMSGSIZE; 1357 } 1358 1359 static int nfc_genl_dump_ses(struct sk_buff *skb, 1360 struct netlink_callback *cb) 1361 { 1362 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 1363 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; 1364 bool first_call = false; 1365 1366 if (!iter) { 1367 first_call = true; 1368 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL); 1369 if (!iter) 1370 return -ENOMEM; 1371 cb->args[0] = (long) iter; 1372 } 1373 1374 mutex_lock(&nfc_devlist_mutex); 1375 1376 cb->seq = nfc_devlist_generation; 1377 1378 if (first_call) { 1379 nfc_device_iter_init(iter); 1380 dev = nfc_device_iter_next(iter); 1381 } 1382 1383 while (dev) { 1384 int rc; 1385 1386 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid, 1387 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI); 1388 if (rc < 0) 1389 break; 1390 1391 dev = nfc_device_iter_next(iter); 1392 } 1393 1394 mutex_unlock(&nfc_devlist_mutex); 1395 1396 cb->args[1] = (long) dev; 1397 1398 return skb->len; 1399 } 1400 1401 static int nfc_genl_dump_ses_done(struct netlink_callback *cb) 1402 { 1403 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 1404 1405 if (iter) { 1406 nfc_device_iter_exit(iter); 1407 kfree(iter); 1408 } 1409 1410 return 0; 1411 } 1412 1413 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx, 1414 u8 *apdu, size_t apdu_length, 1415 se_io_cb_t cb, void *cb_context) 1416 { 1417 struct nfc_se *se; 1418 int rc; 1419 1420 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx); 1421 1422 device_lock(&dev->dev); 1423 1424 if (!device_is_registered(&dev->dev)) { 1425 rc = -ENODEV; 1426 goto error; 1427 } 1428 1429 if (!dev->dev_up) { 1430 rc = -ENODEV; 1431 goto error; 1432 } 1433 1434 if (!dev->ops->se_io) { 1435 rc = -EOPNOTSUPP; 1436 goto error; 1437 } 1438 1439 se = nfc_find_se(dev, se_idx); 1440 if (!se) { 1441 rc = -EINVAL; 1442 goto error; 1443 } 1444 1445 if (se->state != NFC_SE_ENABLED) { 1446 rc = -ENODEV; 1447 goto error; 1448 } 1449 1450 rc = dev->ops->se_io(dev, se_idx, apdu, 1451 apdu_length, cb, cb_context); 1452 1453 device_unlock(&dev->dev); 1454 return rc; 1455 1456 error: 1457 device_unlock(&dev->dev); 1458 kfree(cb_context); 1459 return rc; 1460 } 1461 1462 struct se_io_ctx { 1463 u32 dev_idx; 1464 u32 se_idx; 1465 }; 1466 1467 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err) 1468 { 1469 struct se_io_ctx *ctx = context; 1470 struct sk_buff *msg; 1471 void *hdr; 1472 1473 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1474 if (!msg) { 1475 kfree(ctx); 1476 return; 1477 } 1478 1479 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 1480 NFC_CMD_SE_IO); 1481 if (!hdr) 1482 goto free_msg; 1483 1484 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) || 1485 nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) || 1486 nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu)) 1487 goto nla_put_failure; 1488 1489 genlmsg_end(msg, hdr); 1490 1491 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 1492 1493 kfree(ctx); 1494 1495 return; 1496 1497 nla_put_failure: 1498 free_msg: 1499 nlmsg_free(msg); 1500 kfree(ctx); 1501 1502 return; 1503 } 1504 1505 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info) 1506 { 1507 struct nfc_dev *dev; 1508 struct se_io_ctx *ctx; 1509 u32 dev_idx, se_idx; 1510 u8 *apdu; 1511 size_t apdu_len; 1512 int rc; 1513 1514 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1515 !info->attrs[NFC_ATTR_SE_INDEX] || 1516 !info->attrs[NFC_ATTR_SE_APDU]) 1517 return -EINVAL; 1518 1519 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1520 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]); 1521 1522 dev = nfc_get_device(dev_idx); 1523 if (!dev) 1524 return -ENODEV; 1525 1526 if (!dev->ops || !dev->ops->se_io) { 1527 rc = -EOPNOTSUPP; 1528 goto put_dev; 1529 } 1530 1531 apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]); 1532 if (apdu_len == 0) { 1533 rc = -EINVAL; 1534 goto put_dev; 1535 } 1536 1537 apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]); 1538 if (!apdu) { 1539 rc = -EINVAL; 1540 goto put_dev; 1541 } 1542 1543 ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL); 1544 if (!ctx) { 1545 rc = -ENOMEM; 1546 goto put_dev; 1547 } 1548 1549 ctx->dev_idx = dev_idx; 1550 ctx->se_idx = se_idx; 1551 1552 rc = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx); 1553 1554 put_dev: 1555 nfc_put_device(dev); 1556 return rc; 1557 } 1558 1559 static int nfc_genl_vendor_cmd(struct sk_buff *skb, 1560 struct genl_info *info) 1561 { 1562 struct nfc_dev *dev; 1563 const struct nfc_vendor_cmd *cmd; 1564 u32 dev_idx, vid, subcmd; 1565 u8 *data; 1566 size_t data_len; 1567 int i, err; 1568 1569 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1570 !info->attrs[NFC_ATTR_VENDOR_ID] || 1571 !info->attrs[NFC_ATTR_VENDOR_SUBCMD]) 1572 return -EINVAL; 1573 1574 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1575 vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]); 1576 subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]); 1577 1578 dev = nfc_get_device(dev_idx); 1579 if (!dev) 1580 return -ENODEV; 1581 1582 if (!dev->vendor_cmds || !dev->n_vendor_cmds) { 1583 err = -ENODEV; 1584 goto put_dev; 1585 } 1586 1587 if (info->attrs[NFC_ATTR_VENDOR_DATA]) { 1588 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]); 1589 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]); 1590 if (data_len == 0) { 1591 err = -EINVAL; 1592 goto put_dev; 1593 } 1594 } else { 1595 data = NULL; 1596 data_len = 0; 1597 } 1598 1599 for (i = 0; i < dev->n_vendor_cmds; i++) { 1600 cmd = &dev->vendor_cmds[i]; 1601 1602 if (cmd->vendor_id != vid || cmd->subcmd != subcmd) 1603 continue; 1604 1605 dev->cur_cmd_info = info; 1606 err = cmd->doit(dev, data, data_len); 1607 dev->cur_cmd_info = NULL; 1608 goto put_dev; 1609 } 1610 1611 err = -EOPNOTSUPP; 1612 1613 put_dev: 1614 nfc_put_device(dev); 1615 return err; 1616 } 1617 1618 /* message building helper */ 1619 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq, 1620 int flags, u8 cmd) 1621 { 1622 /* since there is no private header just add the generic one */ 1623 return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd); 1624 } 1625 1626 static struct sk_buff * 1627 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen, 1628 u32 portid, u32 seq, 1629 enum nfc_attrs attr, 1630 u32 oui, u32 subcmd, gfp_t gfp) 1631 { 1632 struct sk_buff *skb; 1633 void *hdr; 1634 1635 skb = nlmsg_new(approxlen + 100, gfp); 1636 if (!skb) 1637 return NULL; 1638 1639 hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR); 1640 if (!hdr) { 1641 kfree_skb(skb); 1642 return NULL; 1643 } 1644 1645 if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx)) 1646 goto nla_put_failure; 1647 if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui)) 1648 goto nla_put_failure; 1649 if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd)) 1650 goto nla_put_failure; 1651 1652 ((void **)skb->cb)[0] = dev; 1653 ((void **)skb->cb)[1] = hdr; 1654 1655 return skb; 1656 1657 nla_put_failure: 1658 kfree_skb(skb); 1659 return NULL; 1660 } 1661 1662 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev, 1663 enum nfc_attrs attr, 1664 u32 oui, u32 subcmd, 1665 int approxlen) 1666 { 1667 if (WARN_ON(!dev->cur_cmd_info)) 1668 return NULL; 1669 1670 return __nfc_alloc_vendor_cmd_skb(dev, approxlen, 1671 dev->cur_cmd_info->snd_portid, 1672 dev->cur_cmd_info->snd_seq, attr, 1673 oui, subcmd, GFP_KERNEL); 1674 } 1675 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb); 1676 1677 int nfc_vendor_cmd_reply(struct sk_buff *skb) 1678 { 1679 struct nfc_dev *dev = ((void **)skb->cb)[0]; 1680 void *hdr = ((void **)skb->cb)[1]; 1681 1682 /* clear CB data for netlink core to own from now on */ 1683 memset(skb->cb, 0, sizeof(skb->cb)); 1684 1685 if (WARN_ON(!dev->cur_cmd_info)) { 1686 kfree_skb(skb); 1687 return -EINVAL; 1688 } 1689 1690 genlmsg_end(skb, hdr); 1691 return genlmsg_reply(skb, dev->cur_cmd_info); 1692 } 1693 EXPORT_SYMBOL(nfc_vendor_cmd_reply); 1694 1695 static const struct genl_ops nfc_genl_ops[] = { 1696 { 1697 .cmd = NFC_CMD_GET_DEVICE, 1698 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1699 .doit = nfc_genl_get_device, 1700 .dumpit = nfc_genl_dump_devices, 1701 .done = nfc_genl_dump_devices_done, 1702 }, 1703 { 1704 .cmd = NFC_CMD_DEV_UP, 1705 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1706 .doit = nfc_genl_dev_up, 1707 .flags = GENL_ADMIN_PERM, 1708 }, 1709 { 1710 .cmd = NFC_CMD_DEV_DOWN, 1711 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1712 .doit = nfc_genl_dev_down, 1713 .flags = GENL_ADMIN_PERM, 1714 }, 1715 { 1716 .cmd = NFC_CMD_START_POLL, 1717 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1718 .doit = nfc_genl_start_poll, 1719 .flags = GENL_ADMIN_PERM, 1720 }, 1721 { 1722 .cmd = NFC_CMD_STOP_POLL, 1723 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1724 .doit = nfc_genl_stop_poll, 1725 .flags = GENL_ADMIN_PERM, 1726 }, 1727 { 1728 .cmd = NFC_CMD_DEP_LINK_UP, 1729 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1730 .doit = nfc_genl_dep_link_up, 1731 .flags = GENL_ADMIN_PERM, 1732 }, 1733 { 1734 .cmd = NFC_CMD_DEP_LINK_DOWN, 1735 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1736 .doit = nfc_genl_dep_link_down, 1737 .flags = GENL_ADMIN_PERM, 1738 }, 1739 { 1740 .cmd = NFC_CMD_GET_TARGET, 1741 .validate = GENL_DONT_VALIDATE_STRICT | 1742 GENL_DONT_VALIDATE_DUMP_STRICT, 1743 .dumpit = nfc_genl_dump_targets, 1744 .done = nfc_genl_dump_targets_done, 1745 }, 1746 { 1747 .cmd = NFC_CMD_LLC_GET_PARAMS, 1748 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1749 .doit = nfc_genl_llc_get_params, 1750 }, 1751 { 1752 .cmd = NFC_CMD_LLC_SET_PARAMS, 1753 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1754 .doit = nfc_genl_llc_set_params, 1755 .flags = GENL_ADMIN_PERM, 1756 }, 1757 { 1758 .cmd = NFC_CMD_LLC_SDREQ, 1759 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1760 .doit = nfc_genl_llc_sdreq, 1761 .flags = GENL_ADMIN_PERM, 1762 }, 1763 { 1764 .cmd = NFC_CMD_FW_DOWNLOAD, 1765 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1766 .doit = nfc_genl_fw_download, 1767 .flags = GENL_ADMIN_PERM, 1768 }, 1769 { 1770 .cmd = NFC_CMD_ENABLE_SE, 1771 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1772 .doit = nfc_genl_enable_se, 1773 .flags = GENL_ADMIN_PERM, 1774 }, 1775 { 1776 .cmd = NFC_CMD_DISABLE_SE, 1777 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1778 .doit = nfc_genl_disable_se, 1779 .flags = GENL_ADMIN_PERM, 1780 }, 1781 { 1782 .cmd = NFC_CMD_GET_SE, 1783 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1784 .dumpit = nfc_genl_dump_ses, 1785 .done = nfc_genl_dump_ses_done, 1786 }, 1787 { 1788 .cmd = NFC_CMD_SE_IO, 1789 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1790 .doit = nfc_genl_se_io, 1791 .flags = GENL_ADMIN_PERM, 1792 }, 1793 { 1794 .cmd = NFC_CMD_ACTIVATE_TARGET, 1795 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1796 .doit = nfc_genl_activate_target, 1797 .flags = GENL_ADMIN_PERM, 1798 }, 1799 { 1800 .cmd = NFC_CMD_VENDOR, 1801 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1802 .doit = nfc_genl_vendor_cmd, 1803 .flags = GENL_ADMIN_PERM, 1804 }, 1805 { 1806 .cmd = NFC_CMD_DEACTIVATE_TARGET, 1807 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1808 .doit = nfc_genl_deactivate_target, 1809 .flags = GENL_ADMIN_PERM, 1810 }, 1811 }; 1812 1813 static struct genl_family nfc_genl_family __ro_after_init = { 1814 .hdrsize = 0, 1815 .name = NFC_GENL_NAME, 1816 .version = NFC_GENL_VERSION, 1817 .maxattr = NFC_ATTR_MAX, 1818 .policy = nfc_genl_policy, 1819 .module = THIS_MODULE, 1820 .ops = nfc_genl_ops, 1821 .n_ops = ARRAY_SIZE(nfc_genl_ops), 1822 .resv_start_op = NFC_CMD_DEACTIVATE_TARGET + 1, 1823 .mcgrps = nfc_genl_mcgrps, 1824 .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps), 1825 }; 1826 1827 1828 struct urelease_work { 1829 struct work_struct w; 1830 u32 portid; 1831 }; 1832 1833 static void nfc_urelease_event_work(struct work_struct *work) 1834 { 1835 struct urelease_work *w = container_of(work, struct urelease_work, w); 1836 struct class_dev_iter iter; 1837 struct nfc_dev *dev; 1838 1839 pr_debug("portid %d\n", w->portid); 1840 1841 mutex_lock(&nfc_devlist_mutex); 1842 1843 nfc_device_iter_init(&iter); 1844 dev = nfc_device_iter_next(&iter); 1845 1846 while (dev) { 1847 mutex_lock(&dev->genl_data.genl_data_mutex); 1848 1849 if (dev->genl_data.poll_req_portid == w->portid) { 1850 nfc_stop_poll(dev); 1851 dev->genl_data.poll_req_portid = 0; 1852 } 1853 1854 mutex_unlock(&dev->genl_data.genl_data_mutex); 1855 1856 dev = nfc_device_iter_next(&iter); 1857 } 1858 1859 nfc_device_iter_exit(&iter); 1860 1861 mutex_unlock(&nfc_devlist_mutex); 1862 1863 kfree(w); 1864 } 1865 1866 static int nfc_genl_rcv_nl_event(struct notifier_block *this, 1867 unsigned long event, void *ptr) 1868 { 1869 struct netlink_notify *n = ptr; 1870 struct urelease_work *w; 1871 1872 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC) 1873 goto out; 1874 1875 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid); 1876 1877 w = kmalloc(sizeof(*w), GFP_ATOMIC); 1878 if (w) { 1879 INIT_WORK(&w->w, nfc_urelease_event_work); 1880 w->portid = n->portid; 1881 schedule_work(&w->w); 1882 } 1883 1884 out: 1885 return NOTIFY_DONE; 1886 } 1887 1888 void nfc_genl_data_init(struct nfc_genl_data *genl_data) 1889 { 1890 genl_data->poll_req_portid = 0; 1891 mutex_init(&genl_data->genl_data_mutex); 1892 } 1893 1894 void nfc_genl_data_exit(struct nfc_genl_data *genl_data) 1895 { 1896 mutex_destroy(&genl_data->genl_data_mutex); 1897 } 1898 1899 static struct notifier_block nl_notifier = { 1900 .notifier_call = nfc_genl_rcv_nl_event, 1901 }; 1902 1903 /** 1904 * nfc_genl_init() - Initialize netlink interface 1905 * 1906 * This initialization function registers the nfc netlink family. 1907 */ 1908 int __init nfc_genl_init(void) 1909 { 1910 int rc; 1911 1912 rc = genl_register_family(&nfc_genl_family); 1913 if (rc) 1914 return rc; 1915 1916 netlink_register_notifier(&nl_notifier); 1917 1918 return 0; 1919 } 1920 1921 /** 1922 * nfc_genl_exit() - Deinitialize netlink interface 1923 * 1924 * This exit function unregisters the nfc netlink family. 1925 */ 1926 void nfc_genl_exit(void) 1927 { 1928 netlink_unregister_notifier(&nl_notifier); 1929 genl_unregister_family(&nfc_genl_family); 1930 } 1931