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 timer_delete_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 timer_delete_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 = timer_container_of(local, t, 247 link_timer); 248 249 pr_err("SYMM timeout\n"); 250 251 schedule_work(&local->timeout_work); 252 } 253 254 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work) 255 { 256 unsigned long time; 257 HLIST_HEAD(nl_sdres_list); 258 struct hlist_node *n; 259 struct nfc_llcp_sdp_tlv *sdp; 260 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 261 sdreq_timeout_work); 262 263 mutex_lock(&local->sdreq_lock); 264 265 time = jiffies - msecs_to_jiffies(3 * local->remote_lto); 266 267 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) { 268 if (time_after(sdp->time, time)) 269 continue; 270 271 sdp->sap = LLCP_SDP_UNBOUND; 272 273 hlist_del(&sdp->node); 274 275 hlist_add_head(&sdp->node, &nl_sdres_list); 276 } 277 278 if (!hlist_empty(&local->pending_sdreqs)) 279 mod_timer(&local->sdreq_timer, 280 jiffies + msecs_to_jiffies(3 * local->remote_lto)); 281 282 mutex_unlock(&local->sdreq_lock); 283 284 if (!hlist_empty(&nl_sdres_list)) 285 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 286 } 287 288 static void nfc_llcp_sdreq_timer(struct timer_list *t) 289 { 290 struct nfc_llcp_local *local = timer_container_of(local, t, 291 sdreq_timer); 292 293 schedule_work(&local->sdreq_timeout_work); 294 } 295 296 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) 297 { 298 struct nfc_llcp_local *local; 299 struct nfc_llcp_local *res = NULL; 300 301 spin_lock(&llcp_devices_lock); 302 list_for_each_entry(local, &llcp_devices, list) 303 if (local->dev == dev) { 304 res = nfc_llcp_local_get(local); 305 break; 306 } 307 spin_unlock(&llcp_devices_lock); 308 309 return res; 310 } 311 312 static struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev) 313 { 314 struct nfc_llcp_local *local, *tmp; 315 316 spin_lock(&llcp_devices_lock); 317 list_for_each_entry_safe(local, tmp, &llcp_devices, list) 318 if (local->dev == dev) { 319 list_del(&local->list); 320 spin_unlock(&llcp_devices_lock); 321 return local; 322 } 323 spin_unlock(&llcp_devices_lock); 324 325 pr_warn("Shutting down device not found\n"); 326 327 return NULL; 328 } 329 330 static char *wks[] = { 331 NULL, 332 NULL, /* SDP */ 333 "urn:nfc:sn:ip", 334 "urn:nfc:sn:obex", 335 "urn:nfc:sn:snep", 336 }; 337 338 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len) 339 { 340 int sap, num_wks; 341 342 pr_debug("%s\n", service_name); 343 344 if (service_name == NULL) 345 return -EINVAL; 346 347 num_wks = ARRAY_SIZE(wks); 348 349 for (sap = 0; sap < num_wks; sap++) { 350 if (wks[sap] == NULL) 351 continue; 352 353 if (strncmp(wks[sap], service_name, service_name_len) == 0) 354 return sap; 355 } 356 357 return -EINVAL; 358 } 359 360 static 361 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local, 362 const u8 *sn, size_t sn_len, 363 bool needref) 364 { 365 struct sock *sk; 366 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 367 368 pr_debug("sn %zd %p\n", sn_len, sn); 369 370 if (sn == NULL || sn_len == 0) 371 return NULL; 372 373 read_lock(&local->sockets.lock); 374 375 llcp_sock = NULL; 376 377 sk_for_each(sk, &local->sockets.head) { 378 tmp_sock = nfc_llcp_sock(sk); 379 380 pr_debug("llcp sock %p\n", tmp_sock); 381 382 if (tmp_sock->sk.sk_type == SOCK_STREAM && 383 tmp_sock->sk.sk_state != LLCP_LISTEN) 384 continue; 385 386 if (tmp_sock->sk.sk_type == SOCK_DGRAM && 387 tmp_sock->sk.sk_state != LLCP_BOUND) 388 continue; 389 390 if (tmp_sock->service_name == NULL || 391 tmp_sock->service_name_len == 0) 392 continue; 393 394 if (tmp_sock->service_name_len != sn_len) 395 continue; 396 397 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { 398 llcp_sock = tmp_sock; 399 if (needref) 400 sock_hold(&llcp_sock->sk); 401 break; 402 } 403 } 404 405 read_unlock(&local->sockets.lock); 406 407 pr_debug("Found llcp sock %p\n", llcp_sock); 408 409 return llcp_sock; 410 } 411 412 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, 413 struct nfc_llcp_sock *sock) 414 { 415 mutex_lock(&local->sdp_lock); 416 417 if (sock->service_name != NULL && sock->service_name_len > 0) { 418 int ssap = nfc_llcp_wks_sap(sock->service_name, 419 sock->service_name_len); 420 421 if (ssap > 0) { 422 pr_debug("WKS %d\n", ssap); 423 424 /* This is a WKS, let's check if it's free */ 425 if (test_bit(ssap, &local->local_wks)) { 426 mutex_unlock(&local->sdp_lock); 427 428 return LLCP_SAP_MAX; 429 } 430 431 set_bit(ssap, &local->local_wks); 432 mutex_unlock(&local->sdp_lock); 433 434 return ssap; 435 } 436 437 /* 438 * Check if there already is a non WKS socket bound 439 * to this service name. 440 */ 441 if (nfc_llcp_sock_from_sn(local, sock->service_name, 442 sock->service_name_len, 443 false) != NULL) { 444 mutex_unlock(&local->sdp_lock); 445 446 return LLCP_SAP_MAX; 447 } 448 449 mutex_unlock(&local->sdp_lock); 450 451 return LLCP_SDP_UNBOUND; 452 453 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) { 454 if (!test_bit(sock->ssap, &local->local_wks)) { 455 set_bit(sock->ssap, &local->local_wks); 456 mutex_unlock(&local->sdp_lock); 457 458 return sock->ssap; 459 } 460 } 461 462 mutex_unlock(&local->sdp_lock); 463 464 return LLCP_SAP_MAX; 465 } 466 467 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) 468 { 469 u8 local_ssap; 470 471 mutex_lock(&local->sdp_lock); 472 473 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); 474 if (local_ssap == LLCP_LOCAL_NUM_SAP) { 475 mutex_unlock(&local->sdp_lock); 476 return LLCP_SAP_MAX; 477 } 478 479 set_bit(local_ssap, &local->local_sap); 480 481 mutex_unlock(&local->sdp_lock); 482 483 return local_ssap + LLCP_LOCAL_SAP_OFFSET; 484 } 485 486 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) 487 { 488 u8 local_ssap; 489 unsigned long *sdp; 490 491 if (ssap < LLCP_WKS_NUM_SAP) { 492 local_ssap = ssap; 493 sdp = &local->local_wks; 494 } else if (ssap < LLCP_LOCAL_NUM_SAP) { 495 atomic_t *client_cnt; 496 497 local_ssap = ssap - LLCP_WKS_NUM_SAP; 498 sdp = &local->local_sdp; 499 client_cnt = &local->local_sdp_cnt[local_ssap]; 500 501 pr_debug("%d clients\n", atomic_read(client_cnt)); 502 503 mutex_lock(&local->sdp_lock); 504 505 if (atomic_dec_and_test(client_cnt)) { 506 struct nfc_llcp_sock *l_sock; 507 508 pr_debug("No more clients for SAP %d\n", ssap); 509 510 clear_bit(local_ssap, sdp); 511 512 /* Find the listening sock and set it back to UNBOUND */ 513 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP); 514 if (l_sock) { 515 l_sock->ssap = LLCP_SDP_UNBOUND; 516 nfc_llcp_sock_put(l_sock); 517 } 518 } 519 520 mutex_unlock(&local->sdp_lock); 521 522 return; 523 } else if (ssap < LLCP_MAX_SAP) { 524 local_ssap = ssap - LLCP_LOCAL_NUM_SAP; 525 sdp = &local->local_sap; 526 } else { 527 return; 528 } 529 530 mutex_lock(&local->sdp_lock); 531 532 clear_bit(local_ssap, sdp); 533 534 mutex_unlock(&local->sdp_lock); 535 } 536 537 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local) 538 { 539 u8 ssap; 540 541 mutex_lock(&local->sdp_lock); 542 543 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); 544 if (ssap == LLCP_SDP_NUM_SAP) { 545 mutex_unlock(&local->sdp_lock); 546 547 return LLCP_SAP_MAX; 548 } 549 550 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); 551 552 set_bit(ssap, &local->local_sdp); 553 554 mutex_unlock(&local->sdp_lock); 555 556 return LLCP_WKS_NUM_SAP + ssap; 557 } 558 559 static int nfc_llcp_build_gb(struct nfc_llcp_local *local) 560 { 561 u8 *gb_cur, version, version_length; 562 u8 lto_length, wks_length, miux_length; 563 const u8 *version_tlv = NULL, *lto_tlv = NULL, 564 *wks_tlv = NULL, *miux_tlv = NULL; 565 __be16 wks = cpu_to_be16(local->local_wks); 566 u8 gb_len = 0; 567 int ret = 0; 568 569 version = LLCP_VERSION_11; 570 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, 571 1, &version_length); 572 if (!version_tlv) { 573 ret = -ENOMEM; 574 goto out; 575 } 576 gb_len += version_length; 577 578 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length); 579 if (!lto_tlv) { 580 ret = -ENOMEM; 581 goto out; 582 } 583 gb_len += lto_length; 584 585 pr_debug("Local wks 0x%lx\n", local->local_wks); 586 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length); 587 if (!wks_tlv) { 588 ret = -ENOMEM; 589 goto out; 590 } 591 gb_len += wks_length; 592 593 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, 594 &miux_length); 595 if (!miux_tlv) { 596 ret = -ENOMEM; 597 goto out; 598 } 599 gb_len += miux_length; 600 601 gb_len += ARRAY_SIZE(llcp_magic); 602 603 if (gb_len > NFC_MAX_GT_LEN) { 604 ret = -EINVAL; 605 goto out; 606 } 607 608 gb_cur = local->gb; 609 610 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); 611 gb_cur += ARRAY_SIZE(llcp_magic); 612 613 memcpy(gb_cur, version_tlv, version_length); 614 gb_cur += version_length; 615 616 memcpy(gb_cur, lto_tlv, lto_length); 617 gb_cur += lto_length; 618 619 memcpy(gb_cur, wks_tlv, wks_length); 620 gb_cur += wks_length; 621 622 memcpy(gb_cur, miux_tlv, miux_length); 623 gb_cur += miux_length; 624 625 local->gb_len = gb_len; 626 627 out: 628 kfree(version_tlv); 629 kfree(lto_tlv); 630 kfree(wks_tlv); 631 kfree(miux_tlv); 632 633 return ret; 634 } 635 636 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) 637 { 638 struct nfc_llcp_local *local; 639 640 local = nfc_llcp_find_local(dev); 641 if (local == NULL) { 642 *general_bytes_len = 0; 643 return NULL; 644 } 645 646 nfc_llcp_build_gb(local); 647 648 *general_bytes_len = local->gb_len; 649 650 nfc_llcp_local_put(local); 651 652 return local->gb; 653 } 654 655 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len) 656 { 657 struct nfc_llcp_local *local; 658 int err; 659 660 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN) 661 return -EINVAL; 662 663 local = nfc_llcp_find_local(dev); 664 if (local == NULL) { 665 pr_err("No LLCP device\n"); 666 return -ENODEV; 667 } 668 669 memset(local->remote_gb, 0, NFC_MAX_GT_LEN); 670 memcpy(local->remote_gb, gb, gb_len); 671 local->remote_gb_len = gb_len; 672 673 if (memcmp(local->remote_gb, llcp_magic, 3)) { 674 pr_err("MAC does not support LLCP\n"); 675 err = -EINVAL; 676 goto out; 677 } 678 679 err = nfc_llcp_parse_gb_tlv(local, 680 &local->remote_gb[3], 681 local->remote_gb_len - 3); 682 out: 683 nfc_llcp_local_put(local); 684 return err; 685 } 686 687 static u8 nfc_llcp_dsap(const struct sk_buff *pdu) 688 { 689 return (pdu->data[0] & 0xfc) >> 2; 690 } 691 692 static u8 nfc_llcp_ptype(const struct sk_buff *pdu) 693 { 694 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); 695 } 696 697 static u8 nfc_llcp_ssap(const struct sk_buff *pdu) 698 { 699 return pdu->data[1] & 0x3f; 700 } 701 702 static u8 nfc_llcp_ns(const struct sk_buff *pdu) 703 { 704 return pdu->data[2] >> 4; 705 } 706 707 static u8 nfc_llcp_nr(const struct sk_buff *pdu) 708 { 709 return pdu->data[2] & 0xf; 710 } 711 712 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) 713 { 714 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); 715 sock->send_n = (sock->send_n + 1) % 16; 716 sock->recv_ack_n = (sock->recv_n - 1) % 16; 717 } 718 719 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, 720 struct sk_buff *skb, u8 direction) 721 { 722 struct sk_buff *skb_copy = NULL, *nskb; 723 struct sock *sk; 724 u8 *data; 725 726 read_lock(&local->raw_sockets.lock); 727 728 sk_for_each(sk, &local->raw_sockets.head) { 729 if (sk->sk_state != LLCP_BOUND) 730 continue; 731 732 if (skb_copy == NULL) { 733 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE, 734 GFP_ATOMIC, true); 735 736 if (skb_copy == NULL) 737 continue; 738 739 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE); 740 741 data[0] = local->dev ? local->dev->idx : 0xFF; 742 data[1] = direction & 0x01; 743 data[1] |= (RAW_PAYLOAD_LLCP << 1); 744 } 745 746 nskb = skb_clone(skb_copy, GFP_ATOMIC); 747 if (!nskb) 748 continue; 749 750 if (sock_queue_rcv_skb(sk, nskb)) 751 kfree_skb(nskb); 752 } 753 754 read_unlock(&local->raw_sockets.lock); 755 756 kfree_skb(skb_copy); 757 } 758 759 static void nfc_llcp_tx_work(struct work_struct *work) 760 { 761 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 762 tx_work); 763 struct sk_buff *skb; 764 struct sock *sk; 765 struct nfc_llcp_sock *llcp_sock; 766 767 skb = skb_dequeue(&local->tx_queue); 768 if (skb != NULL) { 769 sk = skb->sk; 770 llcp_sock = nfc_llcp_sock(sk); 771 772 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { 773 kfree_skb(skb); 774 nfc_llcp_send_symm(local->dev); 775 } else if (llcp_sock && !llcp_sock->remote_ready) { 776 skb_queue_head(&local->tx_queue, skb); 777 nfc_llcp_send_symm(local->dev); 778 } else { 779 struct sk_buff *copy_skb = NULL; 780 u8 ptype = nfc_llcp_ptype(skb); 781 int ret; 782 783 pr_debug("Sending pending skb\n"); 784 print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET, 785 16, 1, skb->data, skb->len, true); 786 787 if (ptype == LLCP_PDU_I) 788 copy_skb = skb_copy(skb, GFP_ATOMIC); 789 790 __net_timestamp(skb); 791 792 nfc_llcp_send_to_raw_sock(local, skb, 793 NFC_DIRECTION_TX); 794 795 ret = nfc_data_exchange(local->dev, local->target_idx, 796 skb, nfc_llcp_recv, local); 797 798 if (ret) { 799 kfree_skb(copy_skb); 800 goto out; 801 } 802 803 if (ptype == LLCP_PDU_I && copy_skb) 804 skb_queue_tail(&llcp_sock->tx_pending_queue, 805 copy_skb); 806 } 807 } else { 808 nfc_llcp_send_symm(local->dev); 809 } 810 811 out: 812 mod_timer(&local->link_timer, 813 jiffies + msecs_to_jiffies(2 * local->remote_lto)); 814 } 815 816 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, 817 u8 ssap) 818 { 819 struct sock *sk; 820 struct nfc_llcp_sock *llcp_sock; 821 822 read_lock(&local->connecting_sockets.lock); 823 824 sk_for_each(sk, &local->connecting_sockets.head) { 825 llcp_sock = nfc_llcp_sock(sk); 826 827 if (llcp_sock->ssap == ssap) { 828 sock_hold(&llcp_sock->sk); 829 goto out; 830 } 831 } 832 833 llcp_sock = NULL; 834 835 out: 836 read_unlock(&local->connecting_sockets.lock); 837 838 return llcp_sock; 839 } 840 841 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, 842 const u8 *sn, size_t sn_len) 843 { 844 return nfc_llcp_sock_from_sn(local, sn, sn_len, true); 845 } 846 847 static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len) 848 { 849 u8 type, length; 850 const u8 *tlv = &skb->data[2]; 851 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; 852 853 while (offset < tlv_array_len) { 854 type = tlv[0]; 855 length = tlv[1]; 856 857 pr_debug("type 0x%x length %d\n", type, length); 858 859 if (type == LLCP_TLV_SN) { 860 *sn_len = length; 861 return &tlv[2]; 862 } 863 864 offset += length + 2; 865 tlv += length + 2; 866 } 867 868 return NULL; 869 } 870 871 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, 872 struct sk_buff *skb) 873 { 874 struct nfc_llcp_sock *llcp_sock; 875 struct nfc_llcp_ui_cb *ui_cb; 876 u8 dsap, ssap; 877 878 dsap = nfc_llcp_dsap(skb); 879 ssap = nfc_llcp_ssap(skb); 880 881 ui_cb = nfc_llcp_ui_skb_cb(skb); 882 ui_cb->dsap = dsap; 883 ui_cb->ssap = ssap; 884 885 pr_debug("%d %d\n", dsap, ssap); 886 887 /* We're looking for a bound socket, not a client one */ 888 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 889 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) 890 return; 891 892 /* There is no sequence with UI frames */ 893 skb_pull(skb, LLCP_HEADER_SIZE); 894 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 895 /* 896 * UI frames will be freed from the socket layer, so we 897 * need to keep them alive until someone receives them. 898 */ 899 skb_get(skb); 900 } else { 901 pr_err("Receive queue is full\n"); 902 } 903 904 nfc_llcp_sock_put(llcp_sock); 905 } 906 907 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, 908 const struct sk_buff *skb) 909 { 910 struct sock *new_sk, *parent; 911 struct nfc_llcp_sock *sock, *new_sock; 912 u8 dsap, ssap, reason; 913 914 dsap = nfc_llcp_dsap(skb); 915 ssap = nfc_llcp_ssap(skb); 916 917 pr_debug("%d %d\n", dsap, ssap); 918 919 if (dsap != LLCP_SAP_SDP) { 920 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 921 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { 922 reason = LLCP_DM_NOBOUND; 923 goto fail; 924 } 925 } else { 926 const u8 *sn; 927 size_t sn_len; 928 929 sn = nfc_llcp_connect_sn(skb, &sn_len); 930 if (sn == NULL) { 931 reason = LLCP_DM_NOBOUND; 932 goto fail; 933 } 934 935 pr_debug("Service name length %zu\n", sn_len); 936 937 sock = nfc_llcp_sock_get_sn(local, sn, sn_len); 938 if (sock == NULL) { 939 reason = LLCP_DM_NOBOUND; 940 goto fail; 941 } 942 } 943 944 lock_sock(&sock->sk); 945 946 parent = &sock->sk; 947 948 if (sk_acceptq_is_full(parent)) { 949 reason = LLCP_DM_REJ; 950 release_sock(&sock->sk); 951 sock_put(&sock->sk); 952 goto fail; 953 } 954 955 if (sock->ssap == LLCP_SDP_UNBOUND) { 956 u8 ssap = nfc_llcp_reserve_sdp_ssap(local); 957 958 pr_debug("First client, reserving %d\n", ssap); 959 960 if (ssap == LLCP_SAP_MAX) { 961 reason = LLCP_DM_REJ; 962 release_sock(&sock->sk); 963 sock_put(&sock->sk); 964 goto fail; 965 } 966 967 sock->ssap = ssap; 968 } 969 970 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0); 971 if (new_sk == NULL) { 972 reason = LLCP_DM_REJ; 973 release_sock(&sock->sk); 974 sock_put(&sock->sk); 975 goto fail; 976 } 977 978 new_sock = nfc_llcp_sock(new_sk); 979 980 new_sock->local = nfc_llcp_local_get(local); 981 if (!new_sock->local) { 982 reason = LLCP_DM_REJ; 983 sock_put(&new_sock->sk); 984 release_sock(&sock->sk); 985 sock_put(&sock->sk); 986 goto fail; 987 } 988 989 new_sock->dev = local->dev; 990 new_sock->rw = sock->rw; 991 new_sock->miux = sock->miux; 992 new_sock->nfc_protocol = sock->nfc_protocol; 993 new_sock->dsap = ssap; 994 new_sock->target_idx = local->target_idx; 995 new_sock->parent = parent; 996 new_sock->ssap = sock->ssap; 997 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { 998 atomic_t *client_count; 999 1000 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); 1001 1002 client_count = 1003 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; 1004 1005 atomic_inc(client_count); 1006 new_sock->reserved_ssap = sock->ssap; 1007 } 1008 1009 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], 1010 skb->len - LLCP_HEADER_SIZE); 1011 1012 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); 1013 1014 nfc_llcp_sock_link(&local->sockets, new_sk); 1015 1016 nfc_llcp_accept_enqueue(&sock->sk, new_sk); 1017 1018 nfc_get_device(local->dev->idx); 1019 1020 new_sk->sk_state = LLCP_CONNECTED; 1021 1022 /* Wake the listening processes */ 1023 parent->sk_data_ready(parent); 1024 1025 /* Send CC */ 1026 nfc_llcp_send_cc(new_sock); 1027 1028 release_sock(&sock->sk); 1029 sock_put(&sock->sk); 1030 1031 return; 1032 1033 fail: 1034 /* Send DM */ 1035 nfc_llcp_send_dm(local, dsap, ssap, reason); 1036 } 1037 1038 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 1039 { 1040 int nr_frames = 0; 1041 struct nfc_llcp_local *local = sock->local; 1042 1043 pr_debug("Remote ready %d tx queue len %d remote rw %d", 1044 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), 1045 sock->remote_rw); 1046 1047 /* Try to queue some I frames for transmission */ 1048 while (sock->remote_ready && 1049 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) { 1050 struct sk_buff *pdu; 1051 1052 pdu = skb_dequeue(&sock->tx_queue); 1053 if (pdu == NULL) 1054 break; 1055 1056 /* Update N(S)/N(R) */ 1057 nfc_llcp_set_nrns(sock, pdu); 1058 1059 skb_queue_tail(&local->tx_queue, pdu); 1060 nr_frames++; 1061 } 1062 1063 return nr_frames; 1064 } 1065 1066 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, 1067 struct sk_buff *skb) 1068 { 1069 struct nfc_llcp_sock *llcp_sock; 1070 struct sock *sk; 1071 u8 dsap, ssap, ptype, ns, nr; 1072 1073 ptype = nfc_llcp_ptype(skb); 1074 dsap = nfc_llcp_dsap(skb); 1075 ssap = nfc_llcp_ssap(skb); 1076 ns = nfc_llcp_ns(skb); 1077 nr = nfc_llcp_nr(skb); 1078 1079 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); 1080 1081 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1082 if (llcp_sock == NULL) { 1083 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1084 return; 1085 } 1086 1087 sk = &llcp_sock->sk; 1088 lock_sock(sk); 1089 if (sk->sk_state == LLCP_CLOSED) { 1090 release_sock(sk); 1091 nfc_llcp_sock_put(llcp_sock); 1092 } 1093 1094 /* Pass the payload upstream */ 1095 if (ptype == LLCP_PDU_I) { 1096 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); 1097 1098 if (ns == llcp_sock->recv_n) 1099 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; 1100 else 1101 pr_err("Received out of sequence I PDU\n"); 1102 1103 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); 1104 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 1105 /* 1106 * I frames will be freed from the socket layer, so we 1107 * need to keep them alive until someone receives them. 1108 */ 1109 skb_get(skb); 1110 } else { 1111 pr_err("Receive queue is full\n"); 1112 } 1113 } 1114 1115 /* Remove skbs from the pending queue */ 1116 if (llcp_sock->send_ack_n != nr) { 1117 struct sk_buff *s, *tmp; 1118 u8 n; 1119 1120 llcp_sock->send_ack_n = nr; 1121 1122 /* Remove and free all skbs until ns == nr */ 1123 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { 1124 n = nfc_llcp_ns(s); 1125 1126 skb_unlink(s, &llcp_sock->tx_pending_queue); 1127 kfree_skb(s); 1128 1129 if (n == nr) 1130 break; 1131 } 1132 1133 /* Re-queue the remaining skbs for transmission */ 1134 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, 1135 s, tmp) { 1136 skb_unlink(s, &llcp_sock->tx_pending_queue); 1137 skb_queue_head(&local->tx_queue, s); 1138 } 1139 } 1140 1141 if (ptype == LLCP_PDU_RR) 1142 llcp_sock->remote_ready = true; 1143 else if (ptype == LLCP_PDU_RNR) 1144 llcp_sock->remote_ready = false; 1145 1146 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) 1147 nfc_llcp_send_rr(llcp_sock); 1148 1149 release_sock(sk); 1150 nfc_llcp_sock_put(llcp_sock); 1151 } 1152 1153 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, 1154 const struct sk_buff *skb) 1155 { 1156 struct nfc_llcp_sock *llcp_sock; 1157 struct sock *sk; 1158 u8 dsap, ssap; 1159 1160 dsap = nfc_llcp_dsap(skb); 1161 ssap = nfc_llcp_ssap(skb); 1162 1163 if ((dsap == 0) && (ssap == 0)) { 1164 pr_debug("Connection termination"); 1165 nfc_dep_link_down(local->dev); 1166 return; 1167 } 1168 1169 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1170 if (llcp_sock == NULL) { 1171 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1172 return; 1173 } 1174 1175 sk = &llcp_sock->sk; 1176 lock_sock(sk); 1177 1178 nfc_llcp_socket_purge(llcp_sock); 1179 1180 if (sk->sk_state == LLCP_CLOSED) { 1181 release_sock(sk); 1182 nfc_llcp_sock_put(llcp_sock); 1183 } 1184 1185 if (sk->sk_state == LLCP_CONNECTED) { 1186 nfc_put_device(local->dev); 1187 sk->sk_state = LLCP_CLOSED; 1188 sk->sk_state_change(sk); 1189 } 1190 1191 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); 1192 1193 release_sock(sk); 1194 nfc_llcp_sock_put(llcp_sock); 1195 } 1196 1197 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, 1198 const struct sk_buff *skb) 1199 { 1200 struct nfc_llcp_sock *llcp_sock; 1201 struct sock *sk; 1202 u8 dsap, ssap; 1203 1204 dsap = nfc_llcp_dsap(skb); 1205 ssap = nfc_llcp_ssap(skb); 1206 1207 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1208 if (llcp_sock == NULL) { 1209 pr_err("Invalid CC\n"); 1210 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1211 1212 return; 1213 } 1214 1215 sk = &llcp_sock->sk; 1216 1217 /* Unlink from connecting and link to the client array */ 1218 nfc_llcp_sock_unlink(&local->connecting_sockets, sk); 1219 nfc_llcp_sock_link(&local->sockets, sk); 1220 llcp_sock->dsap = ssap; 1221 1222 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], 1223 skb->len - LLCP_HEADER_SIZE); 1224 1225 sk->sk_state = LLCP_CONNECTED; 1226 sk->sk_state_change(sk); 1227 1228 nfc_llcp_sock_put(llcp_sock); 1229 } 1230 1231 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, 1232 const struct sk_buff *skb) 1233 { 1234 struct nfc_llcp_sock *llcp_sock; 1235 struct sock *sk; 1236 u8 dsap, ssap, reason; 1237 1238 dsap = nfc_llcp_dsap(skb); 1239 ssap = nfc_llcp_ssap(skb); 1240 reason = skb->data[2]; 1241 1242 pr_debug("%d %d reason %d\n", ssap, dsap, reason); 1243 1244 switch (reason) { 1245 case LLCP_DM_NOBOUND: 1246 case LLCP_DM_REJ: 1247 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1248 break; 1249 1250 default: 1251 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1252 break; 1253 } 1254 1255 if (llcp_sock == NULL) { 1256 pr_debug("Already closed\n"); 1257 return; 1258 } 1259 1260 sk = &llcp_sock->sk; 1261 1262 sk->sk_err = ENXIO; 1263 sk->sk_state = LLCP_CLOSED; 1264 sk->sk_state_change(sk); 1265 1266 nfc_llcp_sock_put(llcp_sock); 1267 } 1268 1269 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, 1270 const struct sk_buff *skb) 1271 { 1272 struct nfc_llcp_sock *llcp_sock; 1273 u8 dsap, ssap, type, length, tid, sap; 1274 const u8 *tlv; 1275 u16 tlv_len, offset; 1276 const char *service_name; 1277 size_t service_name_len; 1278 struct nfc_llcp_sdp_tlv *sdp; 1279 HLIST_HEAD(llc_sdres_list); 1280 size_t sdres_tlvs_len; 1281 HLIST_HEAD(nl_sdres_list); 1282 1283 dsap = nfc_llcp_dsap(skb); 1284 ssap = nfc_llcp_ssap(skb); 1285 1286 pr_debug("%d %d\n", dsap, ssap); 1287 1288 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { 1289 pr_err("Wrong SNL SAP\n"); 1290 return; 1291 } 1292 1293 tlv = &skb->data[LLCP_HEADER_SIZE]; 1294 tlv_len = skb->len - LLCP_HEADER_SIZE; 1295 offset = 0; 1296 sdres_tlvs_len = 0; 1297 1298 while (offset < tlv_len) { 1299 type = tlv[0]; 1300 length = tlv[1]; 1301 1302 switch (type) { 1303 case LLCP_TLV_SDREQ: 1304 tid = tlv[2]; 1305 service_name = (char *) &tlv[3]; 1306 service_name_len = length - 1; 1307 1308 pr_debug("Looking for %.16s\n", service_name); 1309 1310 if (service_name_len == strlen("urn:nfc:sn:sdp") && 1311 !strncmp(service_name, "urn:nfc:sn:sdp", 1312 service_name_len)) { 1313 sap = 1; 1314 goto add_snl; 1315 } 1316 1317 llcp_sock = nfc_llcp_sock_from_sn(local, service_name, 1318 service_name_len, 1319 true); 1320 if (!llcp_sock) { 1321 sap = 0; 1322 goto add_snl; 1323 } 1324 1325 /* 1326 * We found a socket but its ssap has not been reserved 1327 * yet. We need to assign it for good and send a reply. 1328 * The ssap will be freed when the socket is closed. 1329 */ 1330 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { 1331 atomic_t *client_count; 1332 1333 sap = nfc_llcp_reserve_sdp_ssap(local); 1334 1335 pr_debug("Reserving %d\n", sap); 1336 1337 if (sap == LLCP_SAP_MAX) { 1338 sap = 0; 1339 nfc_llcp_sock_put(llcp_sock); 1340 goto add_snl; 1341 } 1342 1343 client_count = 1344 &local->local_sdp_cnt[sap - 1345 LLCP_WKS_NUM_SAP]; 1346 1347 atomic_inc(client_count); 1348 1349 llcp_sock->ssap = sap; 1350 llcp_sock->reserved_ssap = sap; 1351 } else { 1352 sap = llcp_sock->ssap; 1353 } 1354 1355 pr_debug("%p %d\n", llcp_sock, sap); 1356 1357 nfc_llcp_sock_put(llcp_sock); 1358 add_snl: 1359 sdp = nfc_llcp_build_sdres_tlv(tid, sap); 1360 if (sdp == NULL) 1361 goto exit; 1362 1363 sdres_tlvs_len += sdp->tlv_len; 1364 hlist_add_head(&sdp->node, &llc_sdres_list); 1365 break; 1366 1367 case LLCP_TLV_SDRES: 1368 mutex_lock(&local->sdreq_lock); 1369 1370 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]); 1371 1372 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) { 1373 if (sdp->tid != tlv[2]) 1374 continue; 1375 1376 sdp->sap = tlv[3]; 1377 1378 pr_debug("Found: uri=%s, sap=%d\n", 1379 sdp->uri, sdp->sap); 1380 1381 hlist_del(&sdp->node); 1382 1383 hlist_add_head(&sdp->node, &nl_sdres_list); 1384 1385 break; 1386 } 1387 1388 mutex_unlock(&local->sdreq_lock); 1389 break; 1390 1391 default: 1392 pr_err("Invalid SNL tlv value 0x%x\n", type); 1393 break; 1394 } 1395 1396 offset += length + 2; 1397 tlv += length + 2; 1398 } 1399 1400 exit: 1401 if (!hlist_empty(&nl_sdres_list)) 1402 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 1403 1404 if (!hlist_empty(&llc_sdres_list)) 1405 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len); 1406 } 1407 1408 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb) 1409 { 1410 u8 ptype; 1411 u16 pdu_len; 1412 struct sk_buff *new_skb; 1413 1414 if (skb->len <= LLCP_HEADER_SIZE) { 1415 pr_err("Malformed AGF PDU\n"); 1416 return; 1417 } 1418 1419 skb_pull(skb, LLCP_HEADER_SIZE); 1420 1421 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) { 1422 pdu_len = skb->data[0] << 8 | skb->data[1]; 1423 1424 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE); 1425 1426 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) { 1427 pr_err("Malformed AGF PDU\n"); 1428 return; 1429 } 1430 1431 ptype = nfc_llcp_ptype(skb); 1432 1433 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF) 1434 goto next; 1435 1436 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL); 1437 if (new_skb == NULL) { 1438 pr_err("Could not allocate PDU\n"); 1439 return; 1440 } 1441 1442 skb_put_data(new_skb, skb->data, pdu_len); 1443 1444 nfc_llcp_rx_skb(local, new_skb); 1445 1446 kfree_skb(new_skb); 1447 next: 1448 skb_pull(skb, pdu_len); 1449 } 1450 } 1451 1452 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb) 1453 { 1454 u8 dsap, ssap, ptype; 1455 1456 ptype = nfc_llcp_ptype(skb); 1457 dsap = nfc_llcp_dsap(skb); 1458 ssap = nfc_llcp_ssap(skb); 1459 1460 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); 1461 1462 if (ptype != LLCP_PDU_SYMM) 1463 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1, 1464 skb->data, skb->len, true); 1465 1466 switch (ptype) { 1467 case LLCP_PDU_SYMM: 1468 pr_debug("SYMM\n"); 1469 break; 1470 1471 case LLCP_PDU_UI: 1472 pr_debug("UI\n"); 1473 nfc_llcp_recv_ui(local, skb); 1474 break; 1475 1476 case LLCP_PDU_CONNECT: 1477 pr_debug("CONNECT\n"); 1478 nfc_llcp_recv_connect(local, skb); 1479 break; 1480 1481 case LLCP_PDU_DISC: 1482 pr_debug("DISC\n"); 1483 nfc_llcp_recv_disc(local, skb); 1484 break; 1485 1486 case LLCP_PDU_CC: 1487 pr_debug("CC\n"); 1488 nfc_llcp_recv_cc(local, skb); 1489 break; 1490 1491 case LLCP_PDU_DM: 1492 pr_debug("DM\n"); 1493 nfc_llcp_recv_dm(local, skb); 1494 break; 1495 1496 case LLCP_PDU_SNL: 1497 pr_debug("SNL\n"); 1498 nfc_llcp_recv_snl(local, skb); 1499 break; 1500 1501 case LLCP_PDU_I: 1502 case LLCP_PDU_RR: 1503 case LLCP_PDU_RNR: 1504 pr_debug("I frame\n"); 1505 nfc_llcp_recv_hdlc(local, skb); 1506 break; 1507 1508 case LLCP_PDU_AGF: 1509 pr_debug("AGF frame\n"); 1510 nfc_llcp_recv_agf(local, skb); 1511 break; 1512 } 1513 } 1514 1515 static void nfc_llcp_rx_work(struct work_struct *work) 1516 { 1517 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 1518 rx_work); 1519 struct sk_buff *skb; 1520 1521 skb = local->rx_pending; 1522 if (skb == NULL) { 1523 pr_debug("No pending SKB\n"); 1524 return; 1525 } 1526 1527 __net_timestamp(skb); 1528 1529 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX); 1530 1531 nfc_llcp_rx_skb(local, skb); 1532 1533 schedule_work(&local->tx_work); 1534 kfree_skb(local->rx_pending); 1535 local->rx_pending = NULL; 1536 } 1537 1538 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) 1539 { 1540 local->rx_pending = skb; 1541 timer_delete(&local->link_timer); 1542 schedule_work(&local->rx_work); 1543 } 1544 1545 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) 1546 { 1547 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 1548 1549 if (err < 0) { 1550 pr_err("LLCP PDU receive err %d\n", err); 1551 return; 1552 } 1553 1554 __nfc_llcp_recv(local, skb); 1555 } 1556 1557 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) 1558 { 1559 struct nfc_llcp_local *local; 1560 1561 local = nfc_llcp_find_local(dev); 1562 if (local == NULL) { 1563 kfree_skb(skb); 1564 return -ENODEV; 1565 } 1566 1567 __nfc_llcp_recv(local, skb); 1568 1569 nfc_llcp_local_put(local); 1570 1571 return 0; 1572 } 1573 1574 void nfc_llcp_mac_is_down(struct nfc_dev *dev) 1575 { 1576 struct nfc_llcp_local *local; 1577 1578 local = nfc_llcp_find_local(dev); 1579 if (local == NULL) 1580 return; 1581 1582 local->remote_miu = LLCP_DEFAULT_MIU; 1583 local->remote_lto = LLCP_DEFAULT_LTO; 1584 1585 /* Close and purge all existing sockets */ 1586 nfc_llcp_socket_release(local, true, 0); 1587 1588 nfc_llcp_local_put(local); 1589 } 1590 1591 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, 1592 u8 comm_mode, u8 rf_mode) 1593 { 1594 struct nfc_llcp_local *local; 1595 1596 pr_debug("rf mode %d\n", rf_mode); 1597 1598 local = nfc_llcp_find_local(dev); 1599 if (local == NULL) 1600 return; 1601 1602 local->target_idx = target_idx; 1603 local->comm_mode = comm_mode; 1604 local->rf_mode = rf_mode; 1605 1606 if (rf_mode == NFC_RF_INITIATOR) { 1607 pr_debug("Queueing Tx work\n"); 1608 1609 schedule_work(&local->tx_work); 1610 } else { 1611 mod_timer(&local->link_timer, 1612 jiffies + msecs_to_jiffies(local->remote_lto)); 1613 } 1614 1615 nfc_llcp_local_put(local); 1616 } 1617 1618 int nfc_llcp_register_device(struct nfc_dev *ndev) 1619 { 1620 struct nfc_llcp_local *local; 1621 1622 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); 1623 if (local == NULL) 1624 return -ENOMEM; 1625 1626 /* As we are going to initialize local's refcount, we need to get the 1627 * nfc_dev to avoid UAF, otherwise there is no point in continuing. 1628 * See nfc_llcp_local_get(). 1629 */ 1630 local->dev = nfc_get_device(ndev->idx); 1631 if (!local->dev) { 1632 kfree(local); 1633 return -ENODEV; 1634 } 1635 1636 INIT_LIST_HEAD(&local->list); 1637 kref_init(&local->ref); 1638 mutex_init(&local->sdp_lock); 1639 timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0); 1640 1641 skb_queue_head_init(&local->tx_queue); 1642 INIT_WORK(&local->tx_work, nfc_llcp_tx_work); 1643 1644 local->rx_pending = NULL; 1645 INIT_WORK(&local->rx_work, nfc_llcp_rx_work); 1646 1647 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); 1648 1649 rwlock_init(&local->sockets.lock); 1650 rwlock_init(&local->connecting_sockets.lock); 1651 rwlock_init(&local->raw_sockets.lock); 1652 1653 local->lto = 150; /* 1500 ms */ 1654 local->rw = LLCP_MAX_RW; 1655 local->miux = cpu_to_be16(LLCP_MAX_MIUX); 1656 local->local_wks = 0x1; /* LLC Link Management */ 1657 1658 nfc_llcp_build_gb(local); 1659 1660 local->remote_miu = LLCP_DEFAULT_MIU; 1661 local->remote_lto = LLCP_DEFAULT_LTO; 1662 1663 mutex_init(&local->sdreq_lock); 1664 INIT_HLIST_HEAD(&local->pending_sdreqs); 1665 timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0); 1666 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); 1667 1668 spin_lock(&llcp_devices_lock); 1669 list_add(&local->list, &llcp_devices); 1670 spin_unlock(&llcp_devices_lock); 1671 1672 return 0; 1673 } 1674 1675 void nfc_llcp_unregister_device(struct nfc_dev *dev) 1676 { 1677 struct nfc_llcp_local *local = nfc_llcp_remove_local(dev); 1678 1679 if (local == NULL) { 1680 pr_debug("No such device\n"); 1681 return; 1682 } 1683 1684 local_cleanup(local); 1685 1686 nfc_llcp_local_put(local); 1687 } 1688 1689 int __init nfc_llcp_init(void) 1690 { 1691 return nfc_llcp_sock_init(); 1692 } 1693 1694 void nfc_llcp_exit(void) 1695 { 1696 nfc_llcp_sock_exit(); 1697 } 1698