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 !info->attrs[NFC_ATTR_TARGET_INDEX]) 974 return -EINVAL; 975 976 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 977 978 dev = nfc_get_device(idx); 979 if (!dev) 980 return -ENODEV; 981 982 rc = nfc_dep_link_down(dev); 983 984 nfc_put_device(dev); 985 return rc; 986 } 987 988 static int nfc_genl_send_params(struct sk_buff *msg, 989 struct nfc_llcp_local *local, 990 u32 portid, u32 seq) 991 { 992 void *hdr; 993 994 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0, 995 NFC_CMD_LLC_GET_PARAMS); 996 if (!hdr) 997 return -EMSGSIZE; 998 999 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) || 1000 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) || 1001 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) || 1002 nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux))) 1003 goto nla_put_failure; 1004 1005 genlmsg_end(msg, hdr); 1006 return 0; 1007 1008 nla_put_failure: 1009 genlmsg_cancel(msg, hdr); 1010 return -EMSGSIZE; 1011 } 1012 1013 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info) 1014 { 1015 struct nfc_dev *dev; 1016 struct nfc_llcp_local *local; 1017 int rc = 0; 1018 struct sk_buff *msg = NULL; 1019 u32 idx; 1020 1021 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1022 !info->attrs[NFC_ATTR_FIRMWARE_NAME]) 1023 return -EINVAL; 1024 1025 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1026 1027 dev = nfc_get_device(idx); 1028 if (!dev) 1029 return -ENODEV; 1030 1031 device_lock(&dev->dev); 1032 1033 local = nfc_llcp_find_local(dev); 1034 if (!local) { 1035 rc = -ENODEV; 1036 goto exit; 1037 } 1038 1039 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1040 if (!msg) { 1041 rc = -ENOMEM; 1042 goto put_local; 1043 } 1044 1045 rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq); 1046 1047 put_local: 1048 nfc_llcp_local_put(local); 1049 1050 exit: 1051 device_unlock(&dev->dev); 1052 1053 nfc_put_device(dev); 1054 1055 if (rc < 0) { 1056 if (msg) 1057 nlmsg_free(msg); 1058 1059 return rc; 1060 } 1061 1062 return genlmsg_reply(msg, info); 1063 } 1064 1065 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info) 1066 { 1067 struct nfc_dev *dev; 1068 struct nfc_llcp_local *local; 1069 u8 rw = 0; 1070 u16 miux = 0; 1071 u32 idx; 1072 int rc = 0; 1073 1074 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1075 (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] && 1076 !info->attrs[NFC_ATTR_LLC_PARAM_RW] && 1077 !info->attrs[NFC_ATTR_LLC_PARAM_MIUX])) 1078 return -EINVAL; 1079 1080 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) { 1081 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]); 1082 1083 if (rw > LLCP_MAX_RW) 1084 return -EINVAL; 1085 } 1086 1087 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) { 1088 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]); 1089 1090 if (miux > LLCP_MAX_MIUX) 1091 return -EINVAL; 1092 } 1093 1094 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1095 1096 dev = nfc_get_device(idx); 1097 if (!dev) 1098 return -ENODEV; 1099 1100 device_lock(&dev->dev); 1101 1102 local = nfc_llcp_find_local(dev); 1103 if (!local) { 1104 rc = -ENODEV; 1105 goto exit; 1106 } 1107 1108 if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) { 1109 if (dev->dep_link_up) { 1110 rc = -EINPROGRESS; 1111 goto put_local; 1112 } 1113 1114 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]); 1115 } 1116 1117 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) 1118 local->rw = rw; 1119 1120 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) 1121 local->miux = cpu_to_be16(miux); 1122 1123 put_local: 1124 nfc_llcp_local_put(local); 1125 1126 exit: 1127 device_unlock(&dev->dev); 1128 1129 nfc_put_device(dev); 1130 1131 return rc; 1132 } 1133 1134 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info) 1135 { 1136 struct nfc_dev *dev; 1137 struct nfc_llcp_local *local; 1138 struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1]; 1139 u32 idx; 1140 u8 tid; 1141 char *uri; 1142 int rc = 0, rem; 1143 size_t uri_len, tlvs_len; 1144 struct hlist_head sdreq_list; 1145 struct nfc_llcp_sdp_tlv *sdreq; 1146 1147 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1148 !info->attrs[NFC_ATTR_LLC_SDP]) 1149 return -EINVAL; 1150 1151 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1152 1153 dev = nfc_get_device(idx); 1154 if (!dev) 1155 return -ENODEV; 1156 1157 device_lock(&dev->dev); 1158 1159 if (dev->dep_link_up == false) { 1160 rc = -ENOLINK; 1161 goto exit; 1162 } 1163 1164 local = nfc_llcp_find_local(dev); 1165 if (!local) { 1166 rc = -ENODEV; 1167 goto exit; 1168 } 1169 1170 INIT_HLIST_HEAD(&sdreq_list); 1171 1172 tlvs_len = 0; 1173 1174 nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) { 1175 rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX, 1176 attr, nfc_sdp_genl_policy, 1177 info->extack); 1178 1179 if (rc != 0) { 1180 rc = -EINVAL; 1181 goto put_local; 1182 } 1183 1184 if (!sdp_attrs[NFC_SDP_ATTR_URI]) 1185 continue; 1186 1187 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]); 1188 if (uri_len == 0) 1189 continue; 1190 1191 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]); 1192 if (uri == NULL || *uri == 0) 1193 continue; 1194 1195 tid = local->sdreq_next_tid++; 1196 1197 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len); 1198 if (sdreq == NULL) { 1199 rc = -ENOMEM; 1200 goto put_local; 1201 } 1202 1203 tlvs_len += sdreq->tlv_len; 1204 1205 hlist_add_head(&sdreq->node, &sdreq_list); 1206 } 1207 1208 if (hlist_empty(&sdreq_list)) { 1209 rc = -EINVAL; 1210 goto put_local; 1211 } 1212 1213 rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len); 1214 1215 put_local: 1216 nfc_llcp_local_put(local); 1217 1218 exit: 1219 device_unlock(&dev->dev); 1220 1221 nfc_put_device(dev); 1222 1223 return rc; 1224 } 1225 1226 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info) 1227 { 1228 struct nfc_dev *dev; 1229 int rc; 1230 u32 idx; 1231 char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1]; 1232 1233 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME]) 1234 return -EINVAL; 1235 1236 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1237 1238 dev = nfc_get_device(idx); 1239 if (!dev) 1240 return -ENODEV; 1241 1242 nla_strscpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME], 1243 sizeof(firmware_name)); 1244 1245 rc = nfc_fw_download(dev, firmware_name); 1246 1247 nfc_put_device(dev); 1248 return rc; 1249 } 1250 1251 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name, 1252 u32 result) 1253 { 1254 struct sk_buff *msg; 1255 void *hdr; 1256 1257 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 1258 if (!msg) 1259 return -ENOMEM; 1260 1261 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 1262 NFC_CMD_FW_DOWNLOAD); 1263 if (!hdr) 1264 goto free_msg; 1265 1266 if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) || 1267 nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) || 1268 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) 1269 goto nla_put_failure; 1270 1271 genlmsg_end(msg, hdr); 1272 1273 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC); 1274 1275 return 0; 1276 1277 nla_put_failure: 1278 free_msg: 1279 nlmsg_free(msg); 1280 return -EMSGSIZE; 1281 } 1282 1283 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info) 1284 { 1285 struct nfc_dev *dev; 1286 int rc; 1287 u32 idx, se_idx; 1288 1289 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1290 !info->attrs[NFC_ATTR_SE_INDEX]) 1291 return -EINVAL; 1292 1293 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1294 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]); 1295 1296 dev = nfc_get_device(idx); 1297 if (!dev) 1298 return -ENODEV; 1299 1300 rc = nfc_enable_se(dev, se_idx); 1301 1302 nfc_put_device(dev); 1303 return rc; 1304 } 1305 1306 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info) 1307 { 1308 struct nfc_dev *dev; 1309 int rc; 1310 u32 idx, se_idx; 1311 1312 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1313 !info->attrs[NFC_ATTR_SE_INDEX]) 1314 return -EINVAL; 1315 1316 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1317 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]); 1318 1319 dev = nfc_get_device(idx); 1320 if (!dev) 1321 return -ENODEV; 1322 1323 rc = nfc_disable_se(dev, se_idx); 1324 1325 nfc_put_device(dev); 1326 return rc; 1327 } 1328 1329 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev, 1330 u32 portid, u32 seq, 1331 struct netlink_callback *cb, 1332 int flags) 1333 { 1334 void *hdr; 1335 struct nfc_se *se, *n; 1336 1337 list_for_each_entry_safe(se, n, &dev->secure_elements, list) { 1338 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags, 1339 NFC_CMD_GET_SE); 1340 if (!hdr) 1341 goto nla_put_failure; 1342 1343 if (cb) 1344 genl_dump_check_consistent(cb, hdr); 1345 1346 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || 1347 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) || 1348 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type)) 1349 goto nla_put_failure; 1350 1351 genlmsg_end(msg, hdr); 1352 } 1353 1354 return 0; 1355 1356 nla_put_failure: 1357 genlmsg_cancel(msg, hdr); 1358 return -EMSGSIZE; 1359 } 1360 1361 static int nfc_genl_dump_ses(struct sk_buff *skb, 1362 struct netlink_callback *cb) 1363 { 1364 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 1365 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; 1366 bool first_call = false; 1367 1368 if (!iter) { 1369 first_call = true; 1370 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL); 1371 if (!iter) 1372 return -ENOMEM; 1373 cb->args[0] = (long) iter; 1374 } 1375 1376 mutex_lock(&nfc_devlist_mutex); 1377 1378 cb->seq = nfc_devlist_generation; 1379 1380 if (first_call) { 1381 nfc_device_iter_init(iter); 1382 dev = nfc_device_iter_next(iter); 1383 } 1384 1385 while (dev) { 1386 int rc; 1387 1388 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid, 1389 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI); 1390 if (rc < 0) 1391 break; 1392 1393 dev = nfc_device_iter_next(iter); 1394 } 1395 1396 mutex_unlock(&nfc_devlist_mutex); 1397 1398 cb->args[1] = (long) dev; 1399 1400 return skb->len; 1401 } 1402 1403 static int nfc_genl_dump_ses_done(struct netlink_callback *cb) 1404 { 1405 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; 1406 1407 if (iter) { 1408 nfc_device_iter_exit(iter); 1409 kfree(iter); 1410 } 1411 1412 return 0; 1413 } 1414 1415 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx, 1416 u8 *apdu, size_t apdu_length, 1417 se_io_cb_t cb, void *cb_context) 1418 { 1419 struct nfc_se *se; 1420 int rc; 1421 1422 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx); 1423 1424 device_lock(&dev->dev); 1425 1426 if (!device_is_registered(&dev->dev)) { 1427 rc = -ENODEV; 1428 goto error; 1429 } 1430 1431 if (!dev->dev_up) { 1432 rc = -ENODEV; 1433 goto error; 1434 } 1435 1436 if (!dev->ops->se_io) { 1437 rc = -EOPNOTSUPP; 1438 goto error; 1439 } 1440 1441 se = nfc_find_se(dev, se_idx); 1442 if (!se) { 1443 rc = -EINVAL; 1444 goto error; 1445 } 1446 1447 if (se->state != NFC_SE_ENABLED) { 1448 rc = -ENODEV; 1449 goto error; 1450 } 1451 1452 rc = dev->ops->se_io(dev, se_idx, apdu, 1453 apdu_length, cb, cb_context); 1454 1455 device_unlock(&dev->dev); 1456 return rc; 1457 1458 error: 1459 device_unlock(&dev->dev); 1460 kfree(cb_context); 1461 return rc; 1462 } 1463 1464 struct se_io_ctx { 1465 u32 dev_idx; 1466 u32 se_idx; 1467 }; 1468 1469 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err) 1470 { 1471 struct se_io_ctx *ctx = context; 1472 struct sk_buff *msg; 1473 void *hdr; 1474 1475 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1476 if (!msg) { 1477 kfree(ctx); 1478 return; 1479 } 1480 1481 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, 1482 NFC_CMD_SE_IO); 1483 if (!hdr) 1484 goto free_msg; 1485 1486 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) || 1487 nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) || 1488 nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu)) 1489 goto nla_put_failure; 1490 1491 genlmsg_end(msg, hdr); 1492 1493 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL); 1494 1495 kfree(ctx); 1496 1497 return; 1498 1499 nla_put_failure: 1500 free_msg: 1501 nlmsg_free(msg); 1502 kfree(ctx); 1503 1504 return; 1505 } 1506 1507 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info) 1508 { 1509 struct nfc_dev *dev; 1510 struct se_io_ctx *ctx; 1511 u32 dev_idx, se_idx; 1512 u8 *apdu; 1513 size_t apdu_len; 1514 int rc; 1515 1516 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1517 !info->attrs[NFC_ATTR_SE_INDEX] || 1518 !info->attrs[NFC_ATTR_SE_APDU]) 1519 return -EINVAL; 1520 1521 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1522 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]); 1523 1524 dev = nfc_get_device(dev_idx); 1525 if (!dev) 1526 return -ENODEV; 1527 1528 if (!dev->ops || !dev->ops->se_io) { 1529 rc = -EOPNOTSUPP; 1530 goto put_dev; 1531 } 1532 1533 apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]); 1534 if (apdu_len == 0) { 1535 rc = -EINVAL; 1536 goto put_dev; 1537 } 1538 1539 apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]); 1540 if (!apdu) { 1541 rc = -EINVAL; 1542 goto put_dev; 1543 } 1544 1545 ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL); 1546 if (!ctx) { 1547 rc = -ENOMEM; 1548 goto put_dev; 1549 } 1550 1551 ctx->dev_idx = dev_idx; 1552 ctx->se_idx = se_idx; 1553 1554 rc = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx); 1555 1556 put_dev: 1557 nfc_put_device(dev); 1558 return rc; 1559 } 1560 1561 static int nfc_genl_vendor_cmd(struct sk_buff *skb, 1562 struct genl_info *info) 1563 { 1564 struct nfc_dev *dev; 1565 const struct nfc_vendor_cmd *cmd; 1566 u32 dev_idx, vid, subcmd; 1567 u8 *data; 1568 size_t data_len; 1569 int i, err; 1570 1571 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || 1572 !info->attrs[NFC_ATTR_VENDOR_ID] || 1573 !info->attrs[NFC_ATTR_VENDOR_SUBCMD]) 1574 return -EINVAL; 1575 1576 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); 1577 vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]); 1578 subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]); 1579 1580 dev = nfc_get_device(dev_idx); 1581 if (!dev) 1582 return -ENODEV; 1583 1584 if (!dev->vendor_cmds || !dev->n_vendor_cmds) { 1585 err = -ENODEV; 1586 goto put_dev; 1587 } 1588 1589 if (info->attrs[NFC_ATTR_VENDOR_DATA]) { 1590 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]); 1591 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]); 1592 if (data_len == 0) { 1593 err = -EINVAL; 1594 goto put_dev; 1595 } 1596 } else { 1597 data = NULL; 1598 data_len = 0; 1599 } 1600 1601 for (i = 0; i < dev->n_vendor_cmds; i++) { 1602 cmd = &dev->vendor_cmds[i]; 1603 1604 if (cmd->vendor_id != vid || cmd->subcmd != subcmd) 1605 continue; 1606 1607 dev->cur_cmd_info = info; 1608 err = cmd->doit(dev, data, data_len); 1609 dev->cur_cmd_info = NULL; 1610 goto put_dev; 1611 } 1612 1613 err = -EOPNOTSUPP; 1614 1615 put_dev: 1616 nfc_put_device(dev); 1617 return err; 1618 } 1619 1620 /* message building helper */ 1621 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq, 1622 int flags, u8 cmd) 1623 { 1624 /* since there is no private header just add the generic one */ 1625 return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd); 1626 } 1627 1628 static struct sk_buff * 1629 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen, 1630 u32 portid, u32 seq, 1631 enum nfc_attrs attr, 1632 u32 oui, u32 subcmd, gfp_t gfp) 1633 { 1634 struct sk_buff *skb; 1635 void *hdr; 1636 1637 skb = nlmsg_new(approxlen + 100, gfp); 1638 if (!skb) 1639 return NULL; 1640 1641 hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR); 1642 if (!hdr) { 1643 kfree_skb(skb); 1644 return NULL; 1645 } 1646 1647 if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx)) 1648 goto nla_put_failure; 1649 if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui)) 1650 goto nla_put_failure; 1651 if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd)) 1652 goto nla_put_failure; 1653 1654 ((void **)skb->cb)[0] = dev; 1655 ((void **)skb->cb)[1] = hdr; 1656 1657 return skb; 1658 1659 nla_put_failure: 1660 kfree_skb(skb); 1661 return NULL; 1662 } 1663 1664 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev, 1665 enum nfc_attrs attr, 1666 u32 oui, u32 subcmd, 1667 int approxlen) 1668 { 1669 if (WARN_ON(!dev->cur_cmd_info)) 1670 return NULL; 1671 1672 return __nfc_alloc_vendor_cmd_skb(dev, approxlen, 1673 dev->cur_cmd_info->snd_portid, 1674 dev->cur_cmd_info->snd_seq, attr, 1675 oui, subcmd, GFP_KERNEL); 1676 } 1677 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb); 1678 1679 int nfc_vendor_cmd_reply(struct sk_buff *skb) 1680 { 1681 struct nfc_dev *dev = ((void **)skb->cb)[0]; 1682 void *hdr = ((void **)skb->cb)[1]; 1683 1684 /* clear CB data for netlink core to own from now on */ 1685 memset(skb->cb, 0, sizeof(skb->cb)); 1686 1687 if (WARN_ON(!dev->cur_cmd_info)) { 1688 kfree_skb(skb); 1689 return -EINVAL; 1690 } 1691 1692 genlmsg_end(skb, hdr); 1693 return genlmsg_reply(skb, dev->cur_cmd_info); 1694 } 1695 EXPORT_SYMBOL(nfc_vendor_cmd_reply); 1696 1697 static const struct genl_ops nfc_genl_ops[] = { 1698 { 1699 .cmd = NFC_CMD_GET_DEVICE, 1700 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1701 .doit = nfc_genl_get_device, 1702 .dumpit = nfc_genl_dump_devices, 1703 .done = nfc_genl_dump_devices_done, 1704 }, 1705 { 1706 .cmd = NFC_CMD_DEV_UP, 1707 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1708 .doit = nfc_genl_dev_up, 1709 .flags = GENL_ADMIN_PERM, 1710 }, 1711 { 1712 .cmd = NFC_CMD_DEV_DOWN, 1713 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1714 .doit = nfc_genl_dev_down, 1715 .flags = GENL_ADMIN_PERM, 1716 }, 1717 { 1718 .cmd = NFC_CMD_START_POLL, 1719 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1720 .doit = nfc_genl_start_poll, 1721 .flags = GENL_ADMIN_PERM, 1722 }, 1723 { 1724 .cmd = NFC_CMD_STOP_POLL, 1725 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1726 .doit = nfc_genl_stop_poll, 1727 .flags = GENL_ADMIN_PERM, 1728 }, 1729 { 1730 .cmd = NFC_CMD_DEP_LINK_UP, 1731 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1732 .doit = nfc_genl_dep_link_up, 1733 .flags = GENL_ADMIN_PERM, 1734 }, 1735 { 1736 .cmd = NFC_CMD_DEP_LINK_DOWN, 1737 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1738 .doit = nfc_genl_dep_link_down, 1739 .flags = GENL_ADMIN_PERM, 1740 }, 1741 { 1742 .cmd = NFC_CMD_GET_TARGET, 1743 .validate = GENL_DONT_VALIDATE_STRICT | 1744 GENL_DONT_VALIDATE_DUMP_STRICT, 1745 .dumpit = nfc_genl_dump_targets, 1746 .done = nfc_genl_dump_targets_done, 1747 }, 1748 { 1749 .cmd = NFC_CMD_LLC_GET_PARAMS, 1750 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1751 .doit = nfc_genl_llc_get_params, 1752 }, 1753 { 1754 .cmd = NFC_CMD_LLC_SET_PARAMS, 1755 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1756 .doit = nfc_genl_llc_set_params, 1757 .flags = GENL_ADMIN_PERM, 1758 }, 1759 { 1760 .cmd = NFC_CMD_LLC_SDREQ, 1761 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1762 .doit = nfc_genl_llc_sdreq, 1763 .flags = GENL_ADMIN_PERM, 1764 }, 1765 { 1766 .cmd = NFC_CMD_FW_DOWNLOAD, 1767 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1768 .doit = nfc_genl_fw_download, 1769 .flags = GENL_ADMIN_PERM, 1770 }, 1771 { 1772 .cmd = NFC_CMD_ENABLE_SE, 1773 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1774 .doit = nfc_genl_enable_se, 1775 .flags = GENL_ADMIN_PERM, 1776 }, 1777 { 1778 .cmd = NFC_CMD_DISABLE_SE, 1779 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1780 .doit = nfc_genl_disable_se, 1781 .flags = GENL_ADMIN_PERM, 1782 }, 1783 { 1784 .cmd = NFC_CMD_GET_SE, 1785 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1786 .dumpit = nfc_genl_dump_ses, 1787 .done = nfc_genl_dump_ses_done, 1788 }, 1789 { 1790 .cmd = NFC_CMD_SE_IO, 1791 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1792 .doit = nfc_genl_se_io, 1793 .flags = GENL_ADMIN_PERM, 1794 }, 1795 { 1796 .cmd = NFC_CMD_ACTIVATE_TARGET, 1797 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1798 .doit = nfc_genl_activate_target, 1799 .flags = GENL_ADMIN_PERM, 1800 }, 1801 { 1802 .cmd = NFC_CMD_VENDOR, 1803 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1804 .doit = nfc_genl_vendor_cmd, 1805 .flags = GENL_ADMIN_PERM, 1806 }, 1807 { 1808 .cmd = NFC_CMD_DEACTIVATE_TARGET, 1809 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 1810 .doit = nfc_genl_deactivate_target, 1811 .flags = GENL_ADMIN_PERM, 1812 }, 1813 }; 1814 1815 static struct genl_family nfc_genl_family __ro_after_init = { 1816 .hdrsize = 0, 1817 .name = NFC_GENL_NAME, 1818 .version = NFC_GENL_VERSION, 1819 .maxattr = NFC_ATTR_MAX, 1820 .policy = nfc_genl_policy, 1821 .module = THIS_MODULE, 1822 .ops = nfc_genl_ops, 1823 .n_ops = ARRAY_SIZE(nfc_genl_ops), 1824 .resv_start_op = NFC_CMD_DEACTIVATE_TARGET + 1, 1825 .mcgrps = nfc_genl_mcgrps, 1826 .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps), 1827 }; 1828 1829 1830 struct urelease_work { 1831 struct work_struct w; 1832 u32 portid; 1833 }; 1834 1835 static void nfc_urelease_event_work(struct work_struct *work) 1836 { 1837 struct urelease_work *w = container_of(work, struct urelease_work, w); 1838 struct class_dev_iter iter; 1839 struct nfc_dev *dev; 1840 1841 pr_debug("portid %d\n", w->portid); 1842 1843 mutex_lock(&nfc_devlist_mutex); 1844 1845 nfc_device_iter_init(&iter); 1846 dev = nfc_device_iter_next(&iter); 1847 1848 while (dev) { 1849 mutex_lock(&dev->genl_data.genl_data_mutex); 1850 1851 if (dev->genl_data.poll_req_portid == w->portid) { 1852 nfc_stop_poll(dev); 1853 dev->genl_data.poll_req_portid = 0; 1854 } 1855 1856 mutex_unlock(&dev->genl_data.genl_data_mutex); 1857 1858 dev = nfc_device_iter_next(&iter); 1859 } 1860 1861 nfc_device_iter_exit(&iter); 1862 1863 mutex_unlock(&nfc_devlist_mutex); 1864 1865 kfree(w); 1866 } 1867 1868 static int nfc_genl_rcv_nl_event(struct notifier_block *this, 1869 unsigned long event, void *ptr) 1870 { 1871 struct netlink_notify *n = ptr; 1872 struct urelease_work *w; 1873 1874 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC) 1875 goto out; 1876 1877 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid); 1878 1879 w = kmalloc(sizeof(*w), GFP_ATOMIC); 1880 if (w) { 1881 INIT_WORK(&w->w, nfc_urelease_event_work); 1882 w->portid = n->portid; 1883 schedule_work(&w->w); 1884 } 1885 1886 out: 1887 return NOTIFY_DONE; 1888 } 1889 1890 void nfc_genl_data_init(struct nfc_genl_data *genl_data) 1891 { 1892 genl_data->poll_req_portid = 0; 1893 mutex_init(&genl_data->genl_data_mutex); 1894 } 1895 1896 void nfc_genl_data_exit(struct nfc_genl_data *genl_data) 1897 { 1898 mutex_destroy(&genl_data->genl_data_mutex); 1899 } 1900 1901 static struct notifier_block nl_notifier = { 1902 .notifier_call = nfc_genl_rcv_nl_event, 1903 }; 1904 1905 /** 1906 * nfc_genl_init() - Initialize netlink interface 1907 * 1908 * This initialization function registers the nfc netlink family. 1909 */ 1910 int __init nfc_genl_init(void) 1911 { 1912 int rc; 1913 1914 rc = genl_register_family(&nfc_genl_family); 1915 if (rc) 1916 return rc; 1917 1918 netlink_register_notifier(&nl_notifier); 1919 1920 return 0; 1921 } 1922 1923 /** 1924 * nfc_genl_exit() - Deinitialize netlink interface 1925 * 1926 * This exit function unregisters the nfc netlink family. 1927 */ 1928 void nfc_genl_exit(void) 1929 { 1930 netlink_unregister_notifier(&nl_notifier); 1931 genl_unregister_family(&nfc_genl_family); 1932 } 1933