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