1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2011 Intel Corporation. All rights reserved. 4 * Copyright (C) 2014 Marvell International Ltd. 5 */ 6 7 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__ 8 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/list.h> 12 #include <linux/nfc.h> 13 14 #include "nfc.h" 15 #include "llcp.h" 16 17 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d}; 18 19 static LIST_HEAD(llcp_devices); 20 /* Protects llcp_devices list */ 21 static DEFINE_SPINLOCK(llcp_devices_lock); 22 23 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb); 24 25 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk) 26 { 27 write_lock(&l->lock); 28 sk_add_node(sk, &l->head); 29 write_unlock(&l->lock); 30 } 31 32 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk) 33 { 34 write_lock(&l->lock); 35 sk_del_node_init(sk); 36 write_unlock(&l->lock); 37 } 38 39 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock) 40 { 41 sock->remote_rw = LLCP_DEFAULT_RW; 42 sock->remote_miu = LLCP_MAX_MIU + 1; 43 } 44 45 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock) 46 { 47 struct nfc_llcp_local *local = sock->local; 48 struct sk_buff *s, *tmp; 49 50 skb_queue_purge(&sock->tx_queue); 51 skb_queue_purge(&sock->tx_pending_queue); 52 53 if (local == NULL) 54 return; 55 56 /* Search for local pending SKBs that are related to this socket */ 57 skb_queue_walk_safe(&local->tx_queue, s, tmp) { 58 if (s->sk != &sock->sk) 59 continue; 60 61 skb_unlink(s, &local->tx_queue); 62 kfree_skb(s); 63 } 64 } 65 66 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device, 67 int err) 68 { 69 struct sock *sk; 70 struct hlist_node *tmp; 71 struct nfc_llcp_sock *llcp_sock; 72 73 skb_queue_purge(&local->tx_queue); 74 75 write_lock(&local->sockets.lock); 76 77 sk_for_each_safe(sk, tmp, &local->sockets.head) { 78 llcp_sock = nfc_llcp_sock(sk); 79 80 bh_lock_sock(sk); 81 82 nfc_llcp_socket_purge(llcp_sock); 83 84 if (sk->sk_state == LLCP_CONNECTED) 85 nfc_put_device(llcp_sock->dev); 86 87 if (sk->sk_state == LLCP_LISTEN) { 88 struct nfc_llcp_sock *lsk, *n; 89 struct sock *accept_sk; 90 91 list_for_each_entry_safe(lsk, n, 92 &llcp_sock->accept_queue, 93 accept_queue) { 94 accept_sk = &lsk->sk; 95 bh_lock_sock(accept_sk); 96 97 nfc_llcp_accept_unlink(accept_sk); 98 99 if (err) 100 accept_sk->sk_err = err; 101 accept_sk->sk_state = LLCP_CLOSED; 102 accept_sk->sk_state_change(sk); 103 104 bh_unlock_sock(accept_sk); 105 } 106 } 107 108 if (err) 109 sk->sk_err = err; 110 sk->sk_state = LLCP_CLOSED; 111 sk->sk_state_change(sk); 112 113 bh_unlock_sock(sk); 114 115 sk_del_node_init(sk); 116 } 117 118 write_unlock(&local->sockets.lock); 119 120 /* If we still have a device, we keep the RAW sockets alive */ 121 if (device == true) 122 return; 123 124 write_lock(&local->raw_sockets.lock); 125 126 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) { 127 llcp_sock = nfc_llcp_sock(sk); 128 129 bh_lock_sock(sk); 130 131 nfc_llcp_socket_purge(llcp_sock); 132 133 if (err) 134 sk->sk_err = err; 135 sk->sk_state = LLCP_CLOSED; 136 sk->sk_state_change(sk); 137 138 bh_unlock_sock(sk); 139 140 sk_del_node_init(sk); 141 } 142 143 write_unlock(&local->raw_sockets.lock); 144 } 145 146 static struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local) 147 { 148 /* Since using nfc_llcp_local may result in usage of nfc_dev, whenever 149 * we hold a reference to local, we also need to hold a reference to 150 * the device to avoid UAF. 151 */ 152 if (!nfc_get_device(local->dev->idx)) 153 return NULL; 154 155 kref_get(&local->ref); 156 157 return local; 158 } 159 160 static void local_cleanup(struct nfc_llcp_local *local) 161 { 162 nfc_llcp_socket_release(local, false, ENXIO); 163 del_timer_sync(&local->link_timer); 164 skb_queue_purge(&local->tx_queue); 165 cancel_work_sync(&local->tx_work); 166 cancel_work_sync(&local->rx_work); 167 cancel_work_sync(&local->timeout_work); 168 kfree_skb(local->rx_pending); 169 local->rx_pending = NULL; 170 del_timer_sync(&local->sdreq_timer); 171 cancel_work_sync(&local->sdreq_timeout_work); 172 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs); 173 } 174 175 static void local_release(struct kref *ref) 176 { 177 struct nfc_llcp_local *local; 178 179 local = container_of(ref, struct nfc_llcp_local, ref); 180 181 local_cleanup(local); 182 kfree(local); 183 } 184 185 int nfc_llcp_local_put(struct nfc_llcp_local *local) 186 { 187 struct nfc_dev *dev; 188 int ret; 189 190 if (local == NULL) 191 return 0; 192 193 dev = local->dev; 194 195 ret = kref_put(&local->ref, local_release); 196 nfc_put_device(dev); 197 198 return ret; 199 } 200 201 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local, 202 u8 ssap, u8 dsap) 203 { 204 struct sock *sk; 205 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 206 207 pr_debug("ssap dsap %d %d\n", ssap, dsap); 208 209 if (ssap == 0 && dsap == 0) 210 return NULL; 211 212 read_lock(&local->sockets.lock); 213 214 llcp_sock = NULL; 215 216 sk_for_each(sk, &local->sockets.head) { 217 tmp_sock = nfc_llcp_sock(sk); 218 219 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) { 220 llcp_sock = tmp_sock; 221 sock_hold(&llcp_sock->sk); 222 break; 223 } 224 } 225 226 read_unlock(&local->sockets.lock); 227 228 return llcp_sock; 229 } 230 231 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) 232 { 233 sock_put(&sock->sk); 234 } 235 236 static void nfc_llcp_timeout_work(struct work_struct *work) 237 { 238 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 239 timeout_work); 240 241 nfc_dep_link_down(local->dev); 242 } 243 244 static void nfc_llcp_symm_timer(struct timer_list *t) 245 { 246 struct nfc_llcp_local *local = from_timer(local, t, link_timer); 247 248 pr_err("SYMM timeout\n"); 249 250 schedule_work(&local->timeout_work); 251 } 252 253 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work) 254 { 255 unsigned long time; 256 HLIST_HEAD(nl_sdres_list); 257 struct hlist_node *n; 258 struct nfc_llcp_sdp_tlv *sdp; 259 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 260 sdreq_timeout_work); 261 262 mutex_lock(&local->sdreq_lock); 263 264 time = jiffies - msecs_to_jiffies(3 * local->remote_lto); 265 266 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) { 267 if (time_after(sdp->time, time)) 268 continue; 269 270 sdp->sap = LLCP_SDP_UNBOUND; 271 272 hlist_del(&sdp->node); 273 274 hlist_add_head(&sdp->node, &nl_sdres_list); 275 } 276 277 if (!hlist_empty(&local->pending_sdreqs)) 278 mod_timer(&local->sdreq_timer, 279 jiffies + msecs_to_jiffies(3 * local->remote_lto)); 280 281 mutex_unlock(&local->sdreq_lock); 282 283 if (!hlist_empty(&nl_sdres_list)) 284 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 285 } 286 287 static void nfc_llcp_sdreq_timer(struct timer_list *t) 288 { 289 struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer); 290 291 schedule_work(&local->sdreq_timeout_work); 292 } 293 294 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) 295 { 296 struct nfc_llcp_local *local; 297 struct nfc_llcp_local *res = NULL; 298 299 spin_lock(&llcp_devices_lock); 300 list_for_each_entry(local, &llcp_devices, list) 301 if (local->dev == dev) { 302 res = nfc_llcp_local_get(local); 303 break; 304 } 305 spin_unlock(&llcp_devices_lock); 306 307 return res; 308 } 309 310 static struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev) 311 { 312 struct nfc_llcp_local *local, *tmp; 313 314 spin_lock(&llcp_devices_lock); 315 list_for_each_entry_safe(local, tmp, &llcp_devices, list) 316 if (local->dev == dev) { 317 list_del(&local->list); 318 spin_unlock(&llcp_devices_lock); 319 return local; 320 } 321 spin_unlock(&llcp_devices_lock); 322 323 pr_warn("Shutting down device not found\n"); 324 325 return NULL; 326 } 327 328 static char *wks[] = { 329 NULL, 330 NULL, /* SDP */ 331 "urn:nfc:sn:ip", 332 "urn:nfc:sn:obex", 333 "urn:nfc:sn:snep", 334 }; 335 336 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len) 337 { 338 int sap, num_wks; 339 340 pr_debug("%s\n", service_name); 341 342 if (service_name == NULL) 343 return -EINVAL; 344 345 num_wks = ARRAY_SIZE(wks); 346 347 for (sap = 0; sap < num_wks; sap++) { 348 if (wks[sap] == NULL) 349 continue; 350 351 if (strncmp(wks[sap], service_name, service_name_len) == 0) 352 return sap; 353 } 354 355 return -EINVAL; 356 } 357 358 static 359 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local, 360 const u8 *sn, size_t sn_len, 361 bool needref) 362 { 363 struct sock *sk; 364 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 365 366 pr_debug("sn %zd %p\n", sn_len, sn); 367 368 if (sn == NULL || sn_len == 0) 369 return NULL; 370 371 read_lock(&local->sockets.lock); 372 373 llcp_sock = NULL; 374 375 sk_for_each(sk, &local->sockets.head) { 376 tmp_sock = nfc_llcp_sock(sk); 377 378 pr_debug("llcp sock %p\n", tmp_sock); 379 380 if (tmp_sock->sk.sk_type == SOCK_STREAM && 381 tmp_sock->sk.sk_state != LLCP_LISTEN) 382 continue; 383 384 if (tmp_sock->sk.sk_type == SOCK_DGRAM && 385 tmp_sock->sk.sk_state != LLCP_BOUND) 386 continue; 387 388 if (tmp_sock->service_name == NULL || 389 tmp_sock->service_name_len == 0) 390 continue; 391 392 if (tmp_sock->service_name_len != sn_len) 393 continue; 394 395 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { 396 llcp_sock = tmp_sock; 397 if (needref) 398 sock_hold(&llcp_sock->sk); 399 break; 400 } 401 } 402 403 read_unlock(&local->sockets.lock); 404 405 pr_debug("Found llcp sock %p\n", llcp_sock); 406 407 return llcp_sock; 408 } 409 410 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, 411 struct nfc_llcp_sock *sock) 412 { 413 mutex_lock(&local->sdp_lock); 414 415 if (sock->service_name != NULL && sock->service_name_len > 0) { 416 int ssap = nfc_llcp_wks_sap(sock->service_name, 417 sock->service_name_len); 418 419 if (ssap > 0) { 420 pr_debug("WKS %d\n", ssap); 421 422 /* This is a WKS, let's check if it's free */ 423 if (test_bit(ssap, &local->local_wks)) { 424 mutex_unlock(&local->sdp_lock); 425 426 return LLCP_SAP_MAX; 427 } 428 429 set_bit(ssap, &local->local_wks); 430 mutex_unlock(&local->sdp_lock); 431 432 return ssap; 433 } 434 435 /* 436 * Check if there already is a non WKS socket bound 437 * to this service name. 438 */ 439 if (nfc_llcp_sock_from_sn(local, sock->service_name, 440 sock->service_name_len, 441 false) != NULL) { 442 mutex_unlock(&local->sdp_lock); 443 444 return LLCP_SAP_MAX; 445 } 446 447 mutex_unlock(&local->sdp_lock); 448 449 return LLCP_SDP_UNBOUND; 450 451 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) { 452 if (!test_bit(sock->ssap, &local->local_wks)) { 453 set_bit(sock->ssap, &local->local_wks); 454 mutex_unlock(&local->sdp_lock); 455 456 return sock->ssap; 457 } 458 } 459 460 mutex_unlock(&local->sdp_lock); 461 462 return LLCP_SAP_MAX; 463 } 464 465 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) 466 { 467 u8 local_ssap; 468 469 mutex_lock(&local->sdp_lock); 470 471 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); 472 if (local_ssap == LLCP_LOCAL_NUM_SAP) { 473 mutex_unlock(&local->sdp_lock); 474 return LLCP_SAP_MAX; 475 } 476 477 set_bit(local_ssap, &local->local_sap); 478 479 mutex_unlock(&local->sdp_lock); 480 481 return local_ssap + LLCP_LOCAL_SAP_OFFSET; 482 } 483 484 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) 485 { 486 u8 local_ssap; 487 unsigned long *sdp; 488 489 if (ssap < LLCP_WKS_NUM_SAP) { 490 local_ssap = ssap; 491 sdp = &local->local_wks; 492 } else if (ssap < LLCP_LOCAL_NUM_SAP) { 493 atomic_t *client_cnt; 494 495 local_ssap = ssap - LLCP_WKS_NUM_SAP; 496 sdp = &local->local_sdp; 497 client_cnt = &local->local_sdp_cnt[local_ssap]; 498 499 pr_debug("%d clients\n", atomic_read(client_cnt)); 500 501 mutex_lock(&local->sdp_lock); 502 503 if (atomic_dec_and_test(client_cnt)) { 504 struct nfc_llcp_sock *l_sock; 505 506 pr_debug("No more clients for SAP %d\n", ssap); 507 508 clear_bit(local_ssap, sdp); 509 510 /* Find the listening sock and set it back to UNBOUND */ 511 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP); 512 if (l_sock) { 513 l_sock->ssap = LLCP_SDP_UNBOUND; 514 nfc_llcp_sock_put(l_sock); 515 } 516 } 517 518 mutex_unlock(&local->sdp_lock); 519 520 return; 521 } else if (ssap < LLCP_MAX_SAP) { 522 local_ssap = ssap - LLCP_LOCAL_NUM_SAP; 523 sdp = &local->local_sap; 524 } else { 525 return; 526 } 527 528 mutex_lock(&local->sdp_lock); 529 530 clear_bit(local_ssap, sdp); 531 532 mutex_unlock(&local->sdp_lock); 533 } 534 535 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local) 536 { 537 u8 ssap; 538 539 mutex_lock(&local->sdp_lock); 540 541 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); 542 if (ssap == LLCP_SDP_NUM_SAP) { 543 mutex_unlock(&local->sdp_lock); 544 545 return LLCP_SAP_MAX; 546 } 547 548 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); 549 550 set_bit(ssap, &local->local_sdp); 551 552 mutex_unlock(&local->sdp_lock); 553 554 return LLCP_WKS_NUM_SAP + ssap; 555 } 556 557 static int nfc_llcp_build_gb(struct nfc_llcp_local *local) 558 { 559 u8 *gb_cur, version, version_length; 560 u8 lto_length, wks_length, miux_length; 561 const u8 *version_tlv = NULL, *lto_tlv = NULL, 562 *wks_tlv = NULL, *miux_tlv = NULL; 563 __be16 wks = cpu_to_be16(local->local_wks); 564 u8 gb_len = 0; 565 int ret = 0; 566 567 version = LLCP_VERSION_11; 568 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, 569 1, &version_length); 570 if (!version_tlv) { 571 ret = -ENOMEM; 572 goto out; 573 } 574 gb_len += version_length; 575 576 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length); 577 if (!lto_tlv) { 578 ret = -ENOMEM; 579 goto out; 580 } 581 gb_len += lto_length; 582 583 pr_debug("Local wks 0x%lx\n", local->local_wks); 584 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length); 585 if (!wks_tlv) { 586 ret = -ENOMEM; 587 goto out; 588 } 589 gb_len += wks_length; 590 591 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, 592 &miux_length); 593 if (!miux_tlv) { 594 ret = -ENOMEM; 595 goto out; 596 } 597 gb_len += miux_length; 598 599 gb_len += ARRAY_SIZE(llcp_magic); 600 601 if (gb_len > NFC_MAX_GT_LEN) { 602 ret = -EINVAL; 603 goto out; 604 } 605 606 gb_cur = local->gb; 607 608 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); 609 gb_cur += ARRAY_SIZE(llcp_magic); 610 611 memcpy(gb_cur, version_tlv, version_length); 612 gb_cur += version_length; 613 614 memcpy(gb_cur, lto_tlv, lto_length); 615 gb_cur += lto_length; 616 617 memcpy(gb_cur, wks_tlv, wks_length); 618 gb_cur += wks_length; 619 620 memcpy(gb_cur, miux_tlv, miux_length); 621 gb_cur += miux_length; 622 623 local->gb_len = gb_len; 624 625 out: 626 kfree(version_tlv); 627 kfree(lto_tlv); 628 kfree(wks_tlv); 629 kfree(miux_tlv); 630 631 return ret; 632 } 633 634 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) 635 { 636 struct nfc_llcp_local *local; 637 638 local = nfc_llcp_find_local(dev); 639 if (local == NULL) { 640 *general_bytes_len = 0; 641 return NULL; 642 } 643 644 nfc_llcp_build_gb(local); 645 646 *general_bytes_len = local->gb_len; 647 648 nfc_llcp_local_put(local); 649 650 return local->gb; 651 } 652 653 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len) 654 { 655 struct nfc_llcp_local *local; 656 int err; 657 658 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN) 659 return -EINVAL; 660 661 local = nfc_llcp_find_local(dev); 662 if (local == NULL) { 663 pr_err("No LLCP device\n"); 664 return -ENODEV; 665 } 666 667 memset(local->remote_gb, 0, NFC_MAX_GT_LEN); 668 memcpy(local->remote_gb, gb, gb_len); 669 local->remote_gb_len = gb_len; 670 671 if (memcmp(local->remote_gb, llcp_magic, 3)) { 672 pr_err("MAC does not support LLCP\n"); 673 err = -EINVAL; 674 goto out; 675 } 676 677 err = nfc_llcp_parse_gb_tlv(local, 678 &local->remote_gb[3], 679 local->remote_gb_len - 3); 680 out: 681 nfc_llcp_local_put(local); 682 return err; 683 } 684 685 static u8 nfc_llcp_dsap(const struct sk_buff *pdu) 686 { 687 return (pdu->data[0] & 0xfc) >> 2; 688 } 689 690 static u8 nfc_llcp_ptype(const struct sk_buff *pdu) 691 { 692 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); 693 } 694 695 static u8 nfc_llcp_ssap(const struct sk_buff *pdu) 696 { 697 return pdu->data[1] & 0x3f; 698 } 699 700 static u8 nfc_llcp_ns(const struct sk_buff *pdu) 701 { 702 return pdu->data[2] >> 4; 703 } 704 705 static u8 nfc_llcp_nr(const struct sk_buff *pdu) 706 { 707 return pdu->data[2] & 0xf; 708 } 709 710 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) 711 { 712 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); 713 sock->send_n = (sock->send_n + 1) % 16; 714 sock->recv_ack_n = (sock->recv_n - 1) % 16; 715 } 716 717 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, 718 struct sk_buff *skb, u8 direction) 719 { 720 struct sk_buff *skb_copy = NULL, *nskb; 721 struct sock *sk; 722 u8 *data; 723 724 read_lock(&local->raw_sockets.lock); 725 726 sk_for_each(sk, &local->raw_sockets.head) { 727 if (sk->sk_state != LLCP_BOUND) 728 continue; 729 730 if (skb_copy == NULL) { 731 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE, 732 GFP_ATOMIC, true); 733 734 if (skb_copy == NULL) 735 continue; 736 737 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE); 738 739 data[0] = local->dev ? local->dev->idx : 0xFF; 740 data[1] = direction & 0x01; 741 data[1] |= (RAW_PAYLOAD_LLCP << 1); 742 } 743 744 nskb = skb_clone(skb_copy, GFP_ATOMIC); 745 if (!nskb) 746 continue; 747 748 if (sock_queue_rcv_skb(sk, nskb)) 749 kfree_skb(nskb); 750 } 751 752 read_unlock(&local->raw_sockets.lock); 753 754 kfree_skb(skb_copy); 755 } 756 757 static void nfc_llcp_tx_work(struct work_struct *work) 758 { 759 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 760 tx_work); 761 struct sk_buff *skb; 762 struct sock *sk; 763 struct nfc_llcp_sock *llcp_sock; 764 765 skb = skb_dequeue(&local->tx_queue); 766 if (skb != NULL) { 767 sk = skb->sk; 768 llcp_sock = nfc_llcp_sock(sk); 769 770 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { 771 kfree_skb(skb); 772 nfc_llcp_send_symm(local->dev); 773 } else if (llcp_sock && !llcp_sock->remote_ready) { 774 skb_queue_head(&local->tx_queue, skb); 775 nfc_llcp_send_symm(local->dev); 776 } else { 777 struct sk_buff *copy_skb = NULL; 778 u8 ptype = nfc_llcp_ptype(skb); 779 int ret; 780 781 pr_debug("Sending pending skb\n"); 782 print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET, 783 16, 1, skb->data, skb->len, true); 784 785 if (ptype == LLCP_PDU_I) 786 copy_skb = skb_copy(skb, GFP_ATOMIC); 787 788 __net_timestamp(skb); 789 790 nfc_llcp_send_to_raw_sock(local, skb, 791 NFC_DIRECTION_TX); 792 793 ret = nfc_data_exchange(local->dev, local->target_idx, 794 skb, nfc_llcp_recv, local); 795 796 if (ret) { 797 kfree_skb(copy_skb); 798 goto out; 799 } 800 801 if (ptype == LLCP_PDU_I && copy_skb) 802 skb_queue_tail(&llcp_sock->tx_pending_queue, 803 copy_skb); 804 } 805 } else { 806 nfc_llcp_send_symm(local->dev); 807 } 808 809 out: 810 mod_timer(&local->link_timer, 811 jiffies + msecs_to_jiffies(2 * local->remote_lto)); 812 } 813 814 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, 815 u8 ssap) 816 { 817 struct sock *sk; 818 struct nfc_llcp_sock *llcp_sock; 819 820 read_lock(&local->connecting_sockets.lock); 821 822 sk_for_each(sk, &local->connecting_sockets.head) { 823 llcp_sock = nfc_llcp_sock(sk); 824 825 if (llcp_sock->ssap == ssap) { 826 sock_hold(&llcp_sock->sk); 827 goto out; 828 } 829 } 830 831 llcp_sock = NULL; 832 833 out: 834 read_unlock(&local->connecting_sockets.lock); 835 836 return llcp_sock; 837 } 838 839 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, 840 const u8 *sn, size_t sn_len) 841 { 842 return nfc_llcp_sock_from_sn(local, sn, sn_len, true); 843 } 844 845 static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len) 846 { 847 u8 type, length; 848 const u8 *tlv = &skb->data[2]; 849 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; 850 851 while (offset < tlv_array_len) { 852 type = tlv[0]; 853 length = tlv[1]; 854 855 pr_debug("type 0x%x length %d\n", type, length); 856 857 if (type == LLCP_TLV_SN) { 858 *sn_len = length; 859 return &tlv[2]; 860 } 861 862 offset += length + 2; 863 tlv += length + 2; 864 } 865 866 return NULL; 867 } 868 869 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, 870 struct sk_buff *skb) 871 { 872 struct nfc_llcp_sock *llcp_sock; 873 struct nfc_llcp_ui_cb *ui_cb; 874 u8 dsap, ssap; 875 876 dsap = nfc_llcp_dsap(skb); 877 ssap = nfc_llcp_ssap(skb); 878 879 ui_cb = nfc_llcp_ui_skb_cb(skb); 880 ui_cb->dsap = dsap; 881 ui_cb->ssap = ssap; 882 883 pr_debug("%d %d\n", dsap, ssap); 884 885 /* We're looking for a bound socket, not a client one */ 886 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 887 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) 888 return; 889 890 /* There is no sequence with UI frames */ 891 skb_pull(skb, LLCP_HEADER_SIZE); 892 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 893 /* 894 * UI frames will be freed from the socket layer, so we 895 * need to keep them alive until someone receives them. 896 */ 897 skb_get(skb); 898 } else { 899 pr_err("Receive queue is full\n"); 900 } 901 902 nfc_llcp_sock_put(llcp_sock); 903 } 904 905 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, 906 const struct sk_buff *skb) 907 { 908 struct sock *new_sk, *parent; 909 struct nfc_llcp_sock *sock, *new_sock; 910 u8 dsap, ssap, reason; 911 912 dsap = nfc_llcp_dsap(skb); 913 ssap = nfc_llcp_ssap(skb); 914 915 pr_debug("%d %d\n", dsap, ssap); 916 917 if (dsap != LLCP_SAP_SDP) { 918 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 919 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { 920 reason = LLCP_DM_NOBOUND; 921 goto fail; 922 } 923 } else { 924 const u8 *sn; 925 size_t sn_len; 926 927 sn = nfc_llcp_connect_sn(skb, &sn_len); 928 if (sn == NULL) { 929 reason = LLCP_DM_NOBOUND; 930 goto fail; 931 } 932 933 pr_debug("Service name length %zu\n", sn_len); 934 935 sock = nfc_llcp_sock_get_sn(local, sn, sn_len); 936 if (sock == NULL) { 937 reason = LLCP_DM_NOBOUND; 938 goto fail; 939 } 940 } 941 942 lock_sock(&sock->sk); 943 944 parent = &sock->sk; 945 946 if (sk_acceptq_is_full(parent)) { 947 reason = LLCP_DM_REJ; 948 release_sock(&sock->sk); 949 sock_put(&sock->sk); 950 goto fail; 951 } 952 953 if (sock->ssap == LLCP_SDP_UNBOUND) { 954 u8 ssap = nfc_llcp_reserve_sdp_ssap(local); 955 956 pr_debug("First client, reserving %d\n", ssap); 957 958 if (ssap == LLCP_SAP_MAX) { 959 reason = LLCP_DM_REJ; 960 release_sock(&sock->sk); 961 sock_put(&sock->sk); 962 goto fail; 963 } 964 965 sock->ssap = ssap; 966 } 967 968 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0); 969 if (new_sk == NULL) { 970 reason = LLCP_DM_REJ; 971 release_sock(&sock->sk); 972 sock_put(&sock->sk); 973 goto fail; 974 } 975 976 new_sock = nfc_llcp_sock(new_sk); 977 978 new_sock->local = nfc_llcp_local_get(local); 979 if (!new_sock->local) { 980 reason = LLCP_DM_REJ; 981 sock_put(&new_sock->sk); 982 release_sock(&sock->sk); 983 sock_put(&sock->sk); 984 goto fail; 985 } 986 987 new_sock->dev = local->dev; 988 new_sock->rw = sock->rw; 989 new_sock->miux = sock->miux; 990 new_sock->nfc_protocol = sock->nfc_protocol; 991 new_sock->dsap = ssap; 992 new_sock->target_idx = local->target_idx; 993 new_sock->parent = parent; 994 new_sock->ssap = sock->ssap; 995 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { 996 atomic_t *client_count; 997 998 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); 999 1000 client_count = 1001 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; 1002 1003 atomic_inc(client_count); 1004 new_sock->reserved_ssap = sock->ssap; 1005 } 1006 1007 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], 1008 skb->len - LLCP_HEADER_SIZE); 1009 1010 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); 1011 1012 nfc_llcp_sock_link(&local->sockets, new_sk); 1013 1014 nfc_llcp_accept_enqueue(&sock->sk, new_sk); 1015 1016 nfc_get_device(local->dev->idx); 1017 1018 new_sk->sk_state = LLCP_CONNECTED; 1019 1020 /* Wake the listening processes */ 1021 parent->sk_data_ready(parent); 1022 1023 /* Send CC */ 1024 nfc_llcp_send_cc(new_sock); 1025 1026 release_sock(&sock->sk); 1027 sock_put(&sock->sk); 1028 1029 return; 1030 1031 fail: 1032 /* Send DM */ 1033 nfc_llcp_send_dm(local, dsap, ssap, reason); 1034 } 1035 1036 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 1037 { 1038 int nr_frames = 0; 1039 struct nfc_llcp_local *local = sock->local; 1040 1041 pr_debug("Remote ready %d tx queue len %d remote rw %d", 1042 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), 1043 sock->remote_rw); 1044 1045 /* Try to queue some I frames for transmission */ 1046 while (sock->remote_ready && 1047 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) { 1048 struct sk_buff *pdu; 1049 1050 pdu = skb_dequeue(&sock->tx_queue); 1051 if (pdu == NULL) 1052 break; 1053 1054 /* Update N(S)/N(R) */ 1055 nfc_llcp_set_nrns(sock, pdu); 1056 1057 skb_queue_tail(&local->tx_queue, pdu); 1058 nr_frames++; 1059 } 1060 1061 return nr_frames; 1062 } 1063 1064 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, 1065 struct sk_buff *skb) 1066 { 1067 struct nfc_llcp_sock *llcp_sock; 1068 struct sock *sk; 1069 u8 dsap, ssap, ptype, ns, nr; 1070 1071 ptype = nfc_llcp_ptype(skb); 1072 dsap = nfc_llcp_dsap(skb); 1073 ssap = nfc_llcp_ssap(skb); 1074 ns = nfc_llcp_ns(skb); 1075 nr = nfc_llcp_nr(skb); 1076 1077 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); 1078 1079 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1080 if (llcp_sock == NULL) { 1081 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1082 return; 1083 } 1084 1085 sk = &llcp_sock->sk; 1086 lock_sock(sk); 1087 if (sk->sk_state == LLCP_CLOSED) { 1088 release_sock(sk); 1089 nfc_llcp_sock_put(llcp_sock); 1090 } 1091 1092 /* Pass the payload upstream */ 1093 if (ptype == LLCP_PDU_I) { 1094 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); 1095 1096 if (ns == llcp_sock->recv_n) 1097 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; 1098 else 1099 pr_err("Received out of sequence I PDU\n"); 1100 1101 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); 1102 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 1103 /* 1104 * I frames will be freed from the socket layer, so we 1105 * need to keep them alive until someone receives them. 1106 */ 1107 skb_get(skb); 1108 } else { 1109 pr_err("Receive queue is full\n"); 1110 } 1111 } 1112 1113 /* Remove skbs from the pending queue */ 1114 if (llcp_sock->send_ack_n != nr) { 1115 struct sk_buff *s, *tmp; 1116 u8 n; 1117 1118 llcp_sock->send_ack_n = nr; 1119 1120 /* Remove and free all skbs until ns == nr */ 1121 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { 1122 n = nfc_llcp_ns(s); 1123 1124 skb_unlink(s, &llcp_sock->tx_pending_queue); 1125 kfree_skb(s); 1126 1127 if (n == nr) 1128 break; 1129 } 1130 1131 /* Re-queue the remaining skbs for transmission */ 1132 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, 1133 s, tmp) { 1134 skb_unlink(s, &llcp_sock->tx_pending_queue); 1135 skb_queue_head(&local->tx_queue, s); 1136 } 1137 } 1138 1139 if (ptype == LLCP_PDU_RR) 1140 llcp_sock->remote_ready = true; 1141 else if (ptype == LLCP_PDU_RNR) 1142 llcp_sock->remote_ready = false; 1143 1144 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) 1145 nfc_llcp_send_rr(llcp_sock); 1146 1147 release_sock(sk); 1148 nfc_llcp_sock_put(llcp_sock); 1149 } 1150 1151 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, 1152 const struct sk_buff *skb) 1153 { 1154 struct nfc_llcp_sock *llcp_sock; 1155 struct sock *sk; 1156 u8 dsap, ssap; 1157 1158 dsap = nfc_llcp_dsap(skb); 1159 ssap = nfc_llcp_ssap(skb); 1160 1161 if ((dsap == 0) && (ssap == 0)) { 1162 pr_debug("Connection termination"); 1163 nfc_dep_link_down(local->dev); 1164 return; 1165 } 1166 1167 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1168 if (llcp_sock == NULL) { 1169 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1170 return; 1171 } 1172 1173 sk = &llcp_sock->sk; 1174 lock_sock(sk); 1175 1176 nfc_llcp_socket_purge(llcp_sock); 1177 1178 if (sk->sk_state == LLCP_CLOSED) { 1179 release_sock(sk); 1180 nfc_llcp_sock_put(llcp_sock); 1181 } 1182 1183 if (sk->sk_state == LLCP_CONNECTED) { 1184 nfc_put_device(local->dev); 1185 sk->sk_state = LLCP_CLOSED; 1186 sk->sk_state_change(sk); 1187 } 1188 1189 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); 1190 1191 release_sock(sk); 1192 nfc_llcp_sock_put(llcp_sock); 1193 } 1194 1195 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, 1196 const struct sk_buff *skb) 1197 { 1198 struct nfc_llcp_sock *llcp_sock; 1199 struct sock *sk; 1200 u8 dsap, ssap; 1201 1202 dsap = nfc_llcp_dsap(skb); 1203 ssap = nfc_llcp_ssap(skb); 1204 1205 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1206 if (llcp_sock == NULL) { 1207 pr_err("Invalid CC\n"); 1208 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1209 1210 return; 1211 } 1212 1213 sk = &llcp_sock->sk; 1214 1215 /* Unlink from connecting and link to the client array */ 1216 nfc_llcp_sock_unlink(&local->connecting_sockets, sk); 1217 nfc_llcp_sock_link(&local->sockets, sk); 1218 llcp_sock->dsap = ssap; 1219 1220 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], 1221 skb->len - LLCP_HEADER_SIZE); 1222 1223 sk->sk_state = LLCP_CONNECTED; 1224 sk->sk_state_change(sk); 1225 1226 nfc_llcp_sock_put(llcp_sock); 1227 } 1228 1229 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, 1230 const struct sk_buff *skb) 1231 { 1232 struct nfc_llcp_sock *llcp_sock; 1233 struct sock *sk; 1234 u8 dsap, ssap, reason; 1235 1236 dsap = nfc_llcp_dsap(skb); 1237 ssap = nfc_llcp_ssap(skb); 1238 reason = skb->data[2]; 1239 1240 pr_debug("%d %d reason %d\n", ssap, dsap, reason); 1241 1242 switch (reason) { 1243 case LLCP_DM_NOBOUND: 1244 case LLCP_DM_REJ: 1245 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1246 break; 1247 1248 default: 1249 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1250 break; 1251 } 1252 1253 if (llcp_sock == NULL) { 1254 pr_debug("Already closed\n"); 1255 return; 1256 } 1257 1258 sk = &llcp_sock->sk; 1259 1260 sk->sk_err = ENXIO; 1261 sk->sk_state = LLCP_CLOSED; 1262 sk->sk_state_change(sk); 1263 1264 nfc_llcp_sock_put(llcp_sock); 1265 } 1266 1267 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, 1268 const struct sk_buff *skb) 1269 { 1270 struct nfc_llcp_sock *llcp_sock; 1271 u8 dsap, ssap, type, length, tid, sap; 1272 const u8 *tlv; 1273 u16 tlv_len, offset; 1274 const char *service_name; 1275 size_t service_name_len; 1276 struct nfc_llcp_sdp_tlv *sdp; 1277 HLIST_HEAD(llc_sdres_list); 1278 size_t sdres_tlvs_len; 1279 HLIST_HEAD(nl_sdres_list); 1280 1281 dsap = nfc_llcp_dsap(skb); 1282 ssap = nfc_llcp_ssap(skb); 1283 1284 pr_debug("%d %d\n", dsap, ssap); 1285 1286 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { 1287 pr_err("Wrong SNL SAP\n"); 1288 return; 1289 } 1290 1291 tlv = &skb->data[LLCP_HEADER_SIZE]; 1292 tlv_len = skb->len - LLCP_HEADER_SIZE; 1293 offset = 0; 1294 sdres_tlvs_len = 0; 1295 1296 while (offset < tlv_len) { 1297 type = tlv[0]; 1298 length = tlv[1]; 1299 1300 switch (type) { 1301 case LLCP_TLV_SDREQ: 1302 tid = tlv[2]; 1303 service_name = (char *) &tlv[3]; 1304 service_name_len = length - 1; 1305 1306 pr_debug("Looking for %.16s\n", service_name); 1307 1308 if (service_name_len == strlen("urn:nfc:sn:sdp") && 1309 !strncmp(service_name, "urn:nfc:sn:sdp", 1310 service_name_len)) { 1311 sap = 1; 1312 goto add_snl; 1313 } 1314 1315 llcp_sock = nfc_llcp_sock_from_sn(local, service_name, 1316 service_name_len, 1317 true); 1318 if (!llcp_sock) { 1319 sap = 0; 1320 goto add_snl; 1321 } 1322 1323 /* 1324 * We found a socket but its ssap has not been reserved 1325 * yet. We need to assign it for good and send a reply. 1326 * The ssap will be freed when the socket is closed. 1327 */ 1328 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { 1329 atomic_t *client_count; 1330 1331 sap = nfc_llcp_reserve_sdp_ssap(local); 1332 1333 pr_debug("Reserving %d\n", sap); 1334 1335 if (sap == LLCP_SAP_MAX) { 1336 sap = 0; 1337 nfc_llcp_sock_put(llcp_sock); 1338 goto add_snl; 1339 } 1340 1341 client_count = 1342 &local->local_sdp_cnt[sap - 1343 LLCP_WKS_NUM_SAP]; 1344 1345 atomic_inc(client_count); 1346 1347 llcp_sock->ssap = sap; 1348 llcp_sock->reserved_ssap = sap; 1349 } else { 1350 sap = llcp_sock->ssap; 1351 } 1352 1353 pr_debug("%p %d\n", llcp_sock, sap); 1354 1355 nfc_llcp_sock_put(llcp_sock); 1356 add_snl: 1357 sdp = nfc_llcp_build_sdres_tlv(tid, sap); 1358 if (sdp == NULL) 1359 goto exit; 1360 1361 sdres_tlvs_len += sdp->tlv_len; 1362 hlist_add_head(&sdp->node, &llc_sdres_list); 1363 break; 1364 1365 case LLCP_TLV_SDRES: 1366 mutex_lock(&local->sdreq_lock); 1367 1368 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]); 1369 1370 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) { 1371 if (sdp->tid != tlv[2]) 1372 continue; 1373 1374 sdp->sap = tlv[3]; 1375 1376 pr_debug("Found: uri=%s, sap=%d\n", 1377 sdp->uri, sdp->sap); 1378 1379 hlist_del(&sdp->node); 1380 1381 hlist_add_head(&sdp->node, &nl_sdres_list); 1382 1383 break; 1384 } 1385 1386 mutex_unlock(&local->sdreq_lock); 1387 break; 1388 1389 default: 1390 pr_err("Invalid SNL tlv value 0x%x\n", type); 1391 break; 1392 } 1393 1394 offset += length + 2; 1395 tlv += length + 2; 1396 } 1397 1398 exit: 1399 if (!hlist_empty(&nl_sdres_list)) 1400 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 1401 1402 if (!hlist_empty(&llc_sdres_list)) 1403 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len); 1404 } 1405 1406 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb) 1407 { 1408 u8 ptype; 1409 u16 pdu_len; 1410 struct sk_buff *new_skb; 1411 1412 if (skb->len <= LLCP_HEADER_SIZE) { 1413 pr_err("Malformed AGF PDU\n"); 1414 return; 1415 } 1416 1417 skb_pull(skb, LLCP_HEADER_SIZE); 1418 1419 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) { 1420 pdu_len = skb->data[0] << 8 | skb->data[1]; 1421 1422 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE); 1423 1424 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) { 1425 pr_err("Malformed AGF PDU\n"); 1426 return; 1427 } 1428 1429 ptype = nfc_llcp_ptype(skb); 1430 1431 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF) 1432 goto next; 1433 1434 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL); 1435 if (new_skb == NULL) { 1436 pr_err("Could not allocate PDU\n"); 1437 return; 1438 } 1439 1440 skb_put_data(new_skb, skb->data, pdu_len); 1441 1442 nfc_llcp_rx_skb(local, new_skb); 1443 1444 kfree_skb(new_skb); 1445 next: 1446 skb_pull(skb, pdu_len); 1447 } 1448 } 1449 1450 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb) 1451 { 1452 u8 dsap, ssap, ptype; 1453 1454 ptype = nfc_llcp_ptype(skb); 1455 dsap = nfc_llcp_dsap(skb); 1456 ssap = nfc_llcp_ssap(skb); 1457 1458 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); 1459 1460 if (ptype != LLCP_PDU_SYMM) 1461 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1, 1462 skb->data, skb->len, true); 1463 1464 switch (ptype) { 1465 case LLCP_PDU_SYMM: 1466 pr_debug("SYMM\n"); 1467 break; 1468 1469 case LLCP_PDU_UI: 1470 pr_debug("UI\n"); 1471 nfc_llcp_recv_ui(local, skb); 1472 break; 1473 1474 case LLCP_PDU_CONNECT: 1475 pr_debug("CONNECT\n"); 1476 nfc_llcp_recv_connect(local, skb); 1477 break; 1478 1479 case LLCP_PDU_DISC: 1480 pr_debug("DISC\n"); 1481 nfc_llcp_recv_disc(local, skb); 1482 break; 1483 1484 case LLCP_PDU_CC: 1485 pr_debug("CC\n"); 1486 nfc_llcp_recv_cc(local, skb); 1487 break; 1488 1489 case LLCP_PDU_DM: 1490 pr_debug("DM\n"); 1491 nfc_llcp_recv_dm(local, skb); 1492 break; 1493 1494 case LLCP_PDU_SNL: 1495 pr_debug("SNL\n"); 1496 nfc_llcp_recv_snl(local, skb); 1497 break; 1498 1499 case LLCP_PDU_I: 1500 case LLCP_PDU_RR: 1501 case LLCP_PDU_RNR: 1502 pr_debug("I frame\n"); 1503 nfc_llcp_recv_hdlc(local, skb); 1504 break; 1505 1506 case LLCP_PDU_AGF: 1507 pr_debug("AGF frame\n"); 1508 nfc_llcp_recv_agf(local, skb); 1509 break; 1510 } 1511 } 1512 1513 static void nfc_llcp_rx_work(struct work_struct *work) 1514 { 1515 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 1516 rx_work); 1517 struct sk_buff *skb; 1518 1519 skb = local->rx_pending; 1520 if (skb == NULL) { 1521 pr_debug("No pending SKB\n"); 1522 return; 1523 } 1524 1525 __net_timestamp(skb); 1526 1527 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX); 1528 1529 nfc_llcp_rx_skb(local, skb); 1530 1531 schedule_work(&local->tx_work); 1532 kfree_skb(local->rx_pending); 1533 local->rx_pending = NULL; 1534 } 1535 1536 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) 1537 { 1538 local->rx_pending = skb; 1539 del_timer(&local->link_timer); 1540 schedule_work(&local->rx_work); 1541 } 1542 1543 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) 1544 { 1545 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 1546 1547 if (err < 0) { 1548 pr_err("LLCP PDU receive err %d\n", err); 1549 return; 1550 } 1551 1552 __nfc_llcp_recv(local, skb); 1553 } 1554 1555 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) 1556 { 1557 struct nfc_llcp_local *local; 1558 1559 local = nfc_llcp_find_local(dev); 1560 if (local == NULL) { 1561 kfree_skb(skb); 1562 return -ENODEV; 1563 } 1564 1565 __nfc_llcp_recv(local, skb); 1566 1567 nfc_llcp_local_put(local); 1568 1569 return 0; 1570 } 1571 1572 void nfc_llcp_mac_is_down(struct nfc_dev *dev) 1573 { 1574 struct nfc_llcp_local *local; 1575 1576 local = nfc_llcp_find_local(dev); 1577 if (local == NULL) 1578 return; 1579 1580 local->remote_miu = LLCP_DEFAULT_MIU; 1581 local->remote_lto = LLCP_DEFAULT_LTO; 1582 1583 /* Close and purge all existing sockets */ 1584 nfc_llcp_socket_release(local, true, 0); 1585 1586 nfc_llcp_local_put(local); 1587 } 1588 1589 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, 1590 u8 comm_mode, u8 rf_mode) 1591 { 1592 struct nfc_llcp_local *local; 1593 1594 pr_debug("rf mode %d\n", rf_mode); 1595 1596 local = nfc_llcp_find_local(dev); 1597 if (local == NULL) 1598 return; 1599 1600 local->target_idx = target_idx; 1601 local->comm_mode = comm_mode; 1602 local->rf_mode = rf_mode; 1603 1604 if (rf_mode == NFC_RF_INITIATOR) { 1605 pr_debug("Queueing Tx work\n"); 1606 1607 schedule_work(&local->tx_work); 1608 } else { 1609 mod_timer(&local->link_timer, 1610 jiffies + msecs_to_jiffies(local->remote_lto)); 1611 } 1612 1613 nfc_llcp_local_put(local); 1614 } 1615 1616 int nfc_llcp_register_device(struct nfc_dev *ndev) 1617 { 1618 struct nfc_llcp_local *local; 1619 1620 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); 1621 if (local == NULL) 1622 return -ENOMEM; 1623 1624 /* As we are going to initialize local's refcount, we need to get the 1625 * nfc_dev to avoid UAF, otherwise there is no point in continuing. 1626 * See nfc_llcp_local_get(). 1627 */ 1628 local->dev = nfc_get_device(ndev->idx); 1629 if (!local->dev) { 1630 kfree(local); 1631 return -ENODEV; 1632 } 1633 1634 INIT_LIST_HEAD(&local->list); 1635 kref_init(&local->ref); 1636 mutex_init(&local->sdp_lock); 1637 timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0); 1638 1639 skb_queue_head_init(&local->tx_queue); 1640 INIT_WORK(&local->tx_work, nfc_llcp_tx_work); 1641 1642 local->rx_pending = NULL; 1643 INIT_WORK(&local->rx_work, nfc_llcp_rx_work); 1644 1645 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); 1646 1647 rwlock_init(&local->sockets.lock); 1648 rwlock_init(&local->connecting_sockets.lock); 1649 rwlock_init(&local->raw_sockets.lock); 1650 1651 local->lto = 150; /* 1500 ms */ 1652 local->rw = LLCP_MAX_RW; 1653 local->miux = cpu_to_be16(LLCP_MAX_MIUX); 1654 local->local_wks = 0x1; /* LLC Link Management */ 1655 1656 nfc_llcp_build_gb(local); 1657 1658 local->remote_miu = LLCP_DEFAULT_MIU; 1659 local->remote_lto = LLCP_DEFAULT_LTO; 1660 1661 mutex_init(&local->sdreq_lock); 1662 INIT_HLIST_HEAD(&local->pending_sdreqs); 1663 timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0); 1664 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); 1665 1666 spin_lock(&llcp_devices_lock); 1667 list_add(&local->list, &llcp_devices); 1668 spin_unlock(&llcp_devices_lock); 1669 1670 return 0; 1671 } 1672 1673 void nfc_llcp_unregister_device(struct nfc_dev *dev) 1674 { 1675 struct nfc_llcp_local *local = nfc_llcp_remove_local(dev); 1676 1677 if (local == NULL) { 1678 pr_debug("No such device\n"); 1679 return; 1680 } 1681 1682 local_cleanup(local); 1683 1684 nfc_llcp_local_put(local); 1685 } 1686 1687 int __init nfc_llcp_init(void) 1688 { 1689 return nfc_llcp_sock_init(); 1690 } 1691 1692 void nfc_llcp_exit(void) 1693 { 1694 nfc_llcp_sock_exit(); 1695 } 1696