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