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 sock_hold(&llcp_sock->sk); 207 break; 208 } 209 } 210 211 read_unlock(&local->sockets.lock); 212 213 return llcp_sock; 214 } 215 216 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) 217 { 218 sock_put(&sock->sk); 219 } 220 221 static void nfc_llcp_timeout_work(struct work_struct *work) 222 { 223 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 224 timeout_work); 225 226 nfc_dep_link_down(local->dev); 227 } 228 229 static void nfc_llcp_symm_timer(struct timer_list *t) 230 { 231 struct nfc_llcp_local *local = from_timer(local, t, link_timer); 232 233 pr_err("SYMM timeout\n"); 234 235 schedule_work(&local->timeout_work); 236 } 237 238 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work) 239 { 240 unsigned long time; 241 HLIST_HEAD(nl_sdres_list); 242 struct hlist_node *n; 243 struct nfc_llcp_sdp_tlv *sdp; 244 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 245 sdreq_timeout_work); 246 247 mutex_lock(&local->sdreq_lock); 248 249 time = jiffies - msecs_to_jiffies(3 * local->remote_lto); 250 251 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) { 252 if (time_after(sdp->time, time)) 253 continue; 254 255 sdp->sap = LLCP_SDP_UNBOUND; 256 257 hlist_del(&sdp->node); 258 259 hlist_add_head(&sdp->node, &nl_sdres_list); 260 } 261 262 if (!hlist_empty(&local->pending_sdreqs)) 263 mod_timer(&local->sdreq_timer, 264 jiffies + msecs_to_jiffies(3 * local->remote_lto)); 265 266 mutex_unlock(&local->sdreq_lock); 267 268 if (!hlist_empty(&nl_sdres_list)) 269 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 270 } 271 272 static void nfc_llcp_sdreq_timer(struct timer_list *t) 273 { 274 struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer); 275 276 schedule_work(&local->sdreq_timeout_work); 277 } 278 279 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) 280 { 281 struct nfc_llcp_local *local; 282 struct nfc_llcp_local *res = NULL; 283 284 spin_lock(&llcp_devices_lock); 285 list_for_each_entry(local, &llcp_devices, list) 286 if (local->dev == dev) { 287 res = nfc_llcp_local_get(local); 288 break; 289 } 290 spin_unlock(&llcp_devices_lock); 291 292 return res; 293 } 294 295 static struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev) 296 { 297 struct nfc_llcp_local *local, *tmp; 298 299 spin_lock(&llcp_devices_lock); 300 list_for_each_entry_safe(local, tmp, &llcp_devices, list) 301 if (local->dev == dev) { 302 list_del(&local->list); 303 spin_unlock(&llcp_devices_lock); 304 return local; 305 } 306 spin_unlock(&llcp_devices_lock); 307 308 pr_warn("Shutting down device not found\n"); 309 310 return NULL; 311 } 312 313 static char *wks[] = { 314 NULL, 315 NULL, /* SDP */ 316 "urn:nfc:sn:ip", 317 "urn:nfc:sn:obex", 318 "urn:nfc:sn:snep", 319 }; 320 321 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len) 322 { 323 int sap, num_wks; 324 325 pr_debug("%s\n", service_name); 326 327 if (service_name == NULL) 328 return -EINVAL; 329 330 num_wks = ARRAY_SIZE(wks); 331 332 for (sap = 0; sap < num_wks; sap++) { 333 if (wks[sap] == NULL) 334 continue; 335 336 if (strncmp(wks[sap], service_name, service_name_len) == 0) 337 return sap; 338 } 339 340 return -EINVAL; 341 } 342 343 static 344 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local, 345 const u8 *sn, size_t sn_len, 346 bool needref) 347 { 348 struct sock *sk; 349 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 350 351 pr_debug("sn %zd %p\n", sn_len, sn); 352 353 if (sn == NULL || sn_len == 0) 354 return NULL; 355 356 read_lock(&local->sockets.lock); 357 358 llcp_sock = NULL; 359 360 sk_for_each(sk, &local->sockets.head) { 361 tmp_sock = nfc_llcp_sock(sk); 362 363 pr_debug("llcp sock %p\n", tmp_sock); 364 365 if (tmp_sock->sk.sk_type == SOCK_STREAM && 366 tmp_sock->sk.sk_state != LLCP_LISTEN) 367 continue; 368 369 if (tmp_sock->sk.sk_type == SOCK_DGRAM && 370 tmp_sock->sk.sk_state != LLCP_BOUND) 371 continue; 372 373 if (tmp_sock->service_name == NULL || 374 tmp_sock->service_name_len == 0) 375 continue; 376 377 if (tmp_sock->service_name_len != sn_len) 378 continue; 379 380 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { 381 llcp_sock = tmp_sock; 382 if (needref) 383 sock_hold(&llcp_sock->sk); 384 break; 385 } 386 } 387 388 read_unlock(&local->sockets.lock); 389 390 pr_debug("Found llcp sock %p\n", llcp_sock); 391 392 return llcp_sock; 393 } 394 395 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, 396 struct nfc_llcp_sock *sock) 397 { 398 mutex_lock(&local->sdp_lock); 399 400 if (sock->service_name != NULL && sock->service_name_len > 0) { 401 int ssap = nfc_llcp_wks_sap(sock->service_name, 402 sock->service_name_len); 403 404 if (ssap > 0) { 405 pr_debug("WKS %d\n", ssap); 406 407 /* This is a WKS, let's check if it's free */ 408 if (test_bit(ssap, &local->local_wks)) { 409 mutex_unlock(&local->sdp_lock); 410 411 return LLCP_SAP_MAX; 412 } 413 414 set_bit(ssap, &local->local_wks); 415 mutex_unlock(&local->sdp_lock); 416 417 return ssap; 418 } 419 420 /* 421 * Check if there already is a non WKS socket bound 422 * to this service name. 423 */ 424 if (nfc_llcp_sock_from_sn(local, sock->service_name, 425 sock->service_name_len, 426 false) != 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 return nfc_llcp_sock_from_sn(local, sn, sn_len, true); 828 } 829 830 static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len) 831 { 832 u8 type, length; 833 const u8 *tlv = &skb->data[2]; 834 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; 835 836 while (offset < tlv_array_len) { 837 type = tlv[0]; 838 length = tlv[1]; 839 840 pr_debug("type 0x%x length %d\n", type, length); 841 842 if (type == LLCP_TLV_SN) { 843 *sn_len = length; 844 return &tlv[2]; 845 } 846 847 offset += length + 2; 848 tlv += length + 2; 849 } 850 851 return NULL; 852 } 853 854 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, 855 struct sk_buff *skb) 856 { 857 struct nfc_llcp_sock *llcp_sock; 858 struct nfc_llcp_ui_cb *ui_cb; 859 u8 dsap, ssap; 860 861 dsap = nfc_llcp_dsap(skb); 862 ssap = nfc_llcp_ssap(skb); 863 864 ui_cb = nfc_llcp_ui_skb_cb(skb); 865 ui_cb->dsap = dsap; 866 ui_cb->ssap = ssap; 867 868 pr_debug("%d %d\n", dsap, ssap); 869 870 /* We're looking for a bound socket, not a client one */ 871 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 872 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) 873 return; 874 875 /* There is no sequence with UI frames */ 876 skb_pull(skb, LLCP_HEADER_SIZE); 877 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 878 /* 879 * UI frames will be freed from the socket layer, so we 880 * need to keep them alive until someone receives them. 881 */ 882 skb_get(skb); 883 } else { 884 pr_err("Receive queue is full\n"); 885 } 886 887 nfc_llcp_sock_put(llcp_sock); 888 } 889 890 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, 891 const struct sk_buff *skb) 892 { 893 struct sock *new_sk, *parent; 894 struct nfc_llcp_sock *sock, *new_sock; 895 u8 dsap, ssap, reason; 896 897 dsap = nfc_llcp_dsap(skb); 898 ssap = nfc_llcp_ssap(skb); 899 900 pr_debug("%d %d\n", dsap, ssap); 901 902 if (dsap != LLCP_SAP_SDP) { 903 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 904 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { 905 reason = LLCP_DM_NOBOUND; 906 goto fail; 907 } 908 } else { 909 const u8 *sn; 910 size_t sn_len; 911 912 sn = nfc_llcp_connect_sn(skb, &sn_len); 913 if (sn == NULL) { 914 reason = LLCP_DM_NOBOUND; 915 goto fail; 916 } 917 918 pr_debug("Service name length %zu\n", sn_len); 919 920 sock = nfc_llcp_sock_get_sn(local, sn, sn_len); 921 if (sock == NULL) { 922 reason = LLCP_DM_NOBOUND; 923 goto fail; 924 } 925 } 926 927 lock_sock(&sock->sk); 928 929 parent = &sock->sk; 930 931 if (sk_acceptq_is_full(parent)) { 932 reason = LLCP_DM_REJ; 933 release_sock(&sock->sk); 934 sock_put(&sock->sk); 935 goto fail; 936 } 937 938 if (sock->ssap == LLCP_SDP_UNBOUND) { 939 u8 ssap = nfc_llcp_reserve_sdp_ssap(local); 940 941 pr_debug("First client, reserving %d\n", ssap); 942 943 if (ssap == LLCP_SAP_MAX) { 944 reason = LLCP_DM_REJ; 945 release_sock(&sock->sk); 946 sock_put(&sock->sk); 947 goto fail; 948 } 949 950 sock->ssap = ssap; 951 } 952 953 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0); 954 if (new_sk == NULL) { 955 reason = LLCP_DM_REJ; 956 release_sock(&sock->sk); 957 sock_put(&sock->sk); 958 goto fail; 959 } 960 961 new_sock = nfc_llcp_sock(new_sk); 962 new_sock->dev = local->dev; 963 new_sock->local = nfc_llcp_local_get(local); 964 new_sock->rw = sock->rw; 965 new_sock->miux = sock->miux; 966 new_sock->nfc_protocol = sock->nfc_protocol; 967 new_sock->dsap = ssap; 968 new_sock->target_idx = local->target_idx; 969 new_sock->parent = parent; 970 new_sock->ssap = sock->ssap; 971 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { 972 atomic_t *client_count; 973 974 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); 975 976 client_count = 977 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; 978 979 atomic_inc(client_count); 980 new_sock->reserved_ssap = sock->ssap; 981 } 982 983 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], 984 skb->len - LLCP_HEADER_SIZE); 985 986 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); 987 988 nfc_llcp_sock_link(&local->sockets, new_sk); 989 990 nfc_llcp_accept_enqueue(&sock->sk, new_sk); 991 992 nfc_get_device(local->dev->idx); 993 994 new_sk->sk_state = LLCP_CONNECTED; 995 996 /* Wake the listening processes */ 997 parent->sk_data_ready(parent); 998 999 /* Send CC */ 1000 nfc_llcp_send_cc(new_sock); 1001 1002 release_sock(&sock->sk); 1003 sock_put(&sock->sk); 1004 1005 return; 1006 1007 fail: 1008 /* Send DM */ 1009 nfc_llcp_send_dm(local, dsap, ssap, reason); 1010 } 1011 1012 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 1013 { 1014 int nr_frames = 0; 1015 struct nfc_llcp_local *local = sock->local; 1016 1017 pr_debug("Remote ready %d tx queue len %d remote rw %d", 1018 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), 1019 sock->remote_rw); 1020 1021 /* Try to queue some I frames for transmission */ 1022 while (sock->remote_ready && 1023 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) { 1024 struct sk_buff *pdu; 1025 1026 pdu = skb_dequeue(&sock->tx_queue); 1027 if (pdu == NULL) 1028 break; 1029 1030 /* Update N(S)/N(R) */ 1031 nfc_llcp_set_nrns(sock, pdu); 1032 1033 skb_queue_tail(&local->tx_queue, pdu); 1034 nr_frames++; 1035 } 1036 1037 return nr_frames; 1038 } 1039 1040 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, 1041 struct sk_buff *skb) 1042 { 1043 struct nfc_llcp_sock *llcp_sock; 1044 struct sock *sk; 1045 u8 dsap, ssap, ptype, ns, nr; 1046 1047 ptype = nfc_llcp_ptype(skb); 1048 dsap = nfc_llcp_dsap(skb); 1049 ssap = nfc_llcp_ssap(skb); 1050 ns = nfc_llcp_ns(skb); 1051 nr = nfc_llcp_nr(skb); 1052 1053 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); 1054 1055 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1056 if (llcp_sock == NULL) { 1057 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1058 return; 1059 } 1060 1061 sk = &llcp_sock->sk; 1062 lock_sock(sk); 1063 if (sk->sk_state == LLCP_CLOSED) { 1064 release_sock(sk); 1065 nfc_llcp_sock_put(llcp_sock); 1066 } 1067 1068 /* Pass the payload upstream */ 1069 if (ptype == LLCP_PDU_I) { 1070 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); 1071 1072 if (ns == llcp_sock->recv_n) 1073 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; 1074 else 1075 pr_err("Received out of sequence I PDU\n"); 1076 1077 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); 1078 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 1079 /* 1080 * I frames will be freed from the socket layer, so we 1081 * need to keep them alive until someone receives them. 1082 */ 1083 skb_get(skb); 1084 } else { 1085 pr_err("Receive queue is full\n"); 1086 } 1087 } 1088 1089 /* Remove skbs from the pending queue */ 1090 if (llcp_sock->send_ack_n != nr) { 1091 struct sk_buff *s, *tmp; 1092 u8 n; 1093 1094 llcp_sock->send_ack_n = nr; 1095 1096 /* Remove and free all skbs until ns == nr */ 1097 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { 1098 n = nfc_llcp_ns(s); 1099 1100 skb_unlink(s, &llcp_sock->tx_pending_queue); 1101 kfree_skb(s); 1102 1103 if (n == nr) 1104 break; 1105 } 1106 1107 /* Re-queue the remaining skbs for transmission */ 1108 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, 1109 s, tmp) { 1110 skb_unlink(s, &llcp_sock->tx_pending_queue); 1111 skb_queue_head(&local->tx_queue, s); 1112 } 1113 } 1114 1115 if (ptype == LLCP_PDU_RR) 1116 llcp_sock->remote_ready = true; 1117 else if (ptype == LLCP_PDU_RNR) 1118 llcp_sock->remote_ready = false; 1119 1120 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) 1121 nfc_llcp_send_rr(llcp_sock); 1122 1123 release_sock(sk); 1124 nfc_llcp_sock_put(llcp_sock); 1125 } 1126 1127 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, 1128 const struct sk_buff *skb) 1129 { 1130 struct nfc_llcp_sock *llcp_sock; 1131 struct sock *sk; 1132 u8 dsap, ssap; 1133 1134 dsap = nfc_llcp_dsap(skb); 1135 ssap = nfc_llcp_ssap(skb); 1136 1137 if ((dsap == 0) && (ssap == 0)) { 1138 pr_debug("Connection termination"); 1139 nfc_dep_link_down(local->dev); 1140 return; 1141 } 1142 1143 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1144 if (llcp_sock == NULL) { 1145 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1146 return; 1147 } 1148 1149 sk = &llcp_sock->sk; 1150 lock_sock(sk); 1151 1152 nfc_llcp_socket_purge(llcp_sock); 1153 1154 if (sk->sk_state == LLCP_CLOSED) { 1155 release_sock(sk); 1156 nfc_llcp_sock_put(llcp_sock); 1157 } 1158 1159 if (sk->sk_state == LLCP_CONNECTED) { 1160 nfc_put_device(local->dev); 1161 sk->sk_state = LLCP_CLOSED; 1162 sk->sk_state_change(sk); 1163 } 1164 1165 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); 1166 1167 release_sock(sk); 1168 nfc_llcp_sock_put(llcp_sock); 1169 } 1170 1171 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, 1172 const struct sk_buff *skb) 1173 { 1174 struct nfc_llcp_sock *llcp_sock; 1175 struct sock *sk; 1176 u8 dsap, ssap; 1177 1178 dsap = nfc_llcp_dsap(skb); 1179 ssap = nfc_llcp_ssap(skb); 1180 1181 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1182 if (llcp_sock == NULL) { 1183 pr_err("Invalid CC\n"); 1184 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1185 1186 return; 1187 } 1188 1189 sk = &llcp_sock->sk; 1190 1191 /* Unlink from connecting and link to the client array */ 1192 nfc_llcp_sock_unlink(&local->connecting_sockets, sk); 1193 nfc_llcp_sock_link(&local->sockets, sk); 1194 llcp_sock->dsap = ssap; 1195 1196 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], 1197 skb->len - LLCP_HEADER_SIZE); 1198 1199 sk->sk_state = LLCP_CONNECTED; 1200 sk->sk_state_change(sk); 1201 1202 nfc_llcp_sock_put(llcp_sock); 1203 } 1204 1205 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, 1206 const struct sk_buff *skb) 1207 { 1208 struct nfc_llcp_sock *llcp_sock; 1209 struct sock *sk; 1210 u8 dsap, ssap, reason; 1211 1212 dsap = nfc_llcp_dsap(skb); 1213 ssap = nfc_llcp_ssap(skb); 1214 reason = skb->data[2]; 1215 1216 pr_debug("%d %d reason %d\n", ssap, dsap, reason); 1217 1218 switch (reason) { 1219 case LLCP_DM_NOBOUND: 1220 case LLCP_DM_REJ: 1221 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1222 break; 1223 1224 default: 1225 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1226 break; 1227 } 1228 1229 if (llcp_sock == NULL) { 1230 pr_debug("Already closed\n"); 1231 return; 1232 } 1233 1234 sk = &llcp_sock->sk; 1235 1236 sk->sk_err = ENXIO; 1237 sk->sk_state = LLCP_CLOSED; 1238 sk->sk_state_change(sk); 1239 1240 nfc_llcp_sock_put(llcp_sock); 1241 } 1242 1243 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, 1244 const struct sk_buff *skb) 1245 { 1246 struct nfc_llcp_sock *llcp_sock; 1247 u8 dsap, ssap, type, length, tid, sap; 1248 const u8 *tlv; 1249 u16 tlv_len, offset; 1250 const char *service_name; 1251 size_t service_name_len; 1252 struct nfc_llcp_sdp_tlv *sdp; 1253 HLIST_HEAD(llc_sdres_list); 1254 size_t sdres_tlvs_len; 1255 HLIST_HEAD(nl_sdres_list); 1256 1257 dsap = nfc_llcp_dsap(skb); 1258 ssap = nfc_llcp_ssap(skb); 1259 1260 pr_debug("%d %d\n", dsap, ssap); 1261 1262 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { 1263 pr_err("Wrong SNL SAP\n"); 1264 return; 1265 } 1266 1267 tlv = &skb->data[LLCP_HEADER_SIZE]; 1268 tlv_len = skb->len - LLCP_HEADER_SIZE; 1269 offset = 0; 1270 sdres_tlvs_len = 0; 1271 1272 while (offset < tlv_len) { 1273 type = tlv[0]; 1274 length = tlv[1]; 1275 1276 switch (type) { 1277 case LLCP_TLV_SDREQ: 1278 tid = tlv[2]; 1279 service_name = (char *) &tlv[3]; 1280 service_name_len = length - 1; 1281 1282 pr_debug("Looking for %.16s\n", service_name); 1283 1284 if (service_name_len == strlen("urn:nfc:sn:sdp") && 1285 !strncmp(service_name, "urn:nfc:sn:sdp", 1286 service_name_len)) { 1287 sap = 1; 1288 goto add_snl; 1289 } 1290 1291 llcp_sock = nfc_llcp_sock_from_sn(local, service_name, 1292 service_name_len, 1293 true); 1294 if (!llcp_sock) { 1295 sap = 0; 1296 goto add_snl; 1297 } 1298 1299 /* 1300 * We found a socket but its ssap has not been reserved 1301 * yet. We need to assign it for good and send a reply. 1302 * The ssap will be freed when the socket is closed. 1303 */ 1304 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { 1305 atomic_t *client_count; 1306 1307 sap = nfc_llcp_reserve_sdp_ssap(local); 1308 1309 pr_debug("Reserving %d\n", sap); 1310 1311 if (sap == LLCP_SAP_MAX) { 1312 sap = 0; 1313 nfc_llcp_sock_put(llcp_sock); 1314 goto add_snl; 1315 } 1316 1317 client_count = 1318 &local->local_sdp_cnt[sap - 1319 LLCP_WKS_NUM_SAP]; 1320 1321 atomic_inc(client_count); 1322 1323 llcp_sock->ssap = sap; 1324 llcp_sock->reserved_ssap = sap; 1325 } else { 1326 sap = llcp_sock->ssap; 1327 } 1328 1329 pr_debug("%p %d\n", llcp_sock, sap); 1330 1331 nfc_llcp_sock_put(llcp_sock); 1332 add_snl: 1333 sdp = nfc_llcp_build_sdres_tlv(tid, sap); 1334 if (sdp == NULL) 1335 goto exit; 1336 1337 sdres_tlvs_len += sdp->tlv_len; 1338 hlist_add_head(&sdp->node, &llc_sdres_list); 1339 break; 1340 1341 case LLCP_TLV_SDRES: 1342 mutex_lock(&local->sdreq_lock); 1343 1344 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]); 1345 1346 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) { 1347 if (sdp->tid != tlv[2]) 1348 continue; 1349 1350 sdp->sap = tlv[3]; 1351 1352 pr_debug("Found: uri=%s, sap=%d\n", 1353 sdp->uri, sdp->sap); 1354 1355 hlist_del(&sdp->node); 1356 1357 hlist_add_head(&sdp->node, &nl_sdres_list); 1358 1359 break; 1360 } 1361 1362 mutex_unlock(&local->sdreq_lock); 1363 break; 1364 1365 default: 1366 pr_err("Invalid SNL tlv value 0x%x\n", type); 1367 break; 1368 } 1369 1370 offset += length + 2; 1371 tlv += length + 2; 1372 } 1373 1374 exit: 1375 if (!hlist_empty(&nl_sdres_list)) 1376 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 1377 1378 if (!hlist_empty(&llc_sdres_list)) 1379 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len); 1380 } 1381 1382 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb) 1383 { 1384 u8 ptype; 1385 u16 pdu_len; 1386 struct sk_buff *new_skb; 1387 1388 if (skb->len <= LLCP_HEADER_SIZE) { 1389 pr_err("Malformed AGF PDU\n"); 1390 return; 1391 } 1392 1393 skb_pull(skb, LLCP_HEADER_SIZE); 1394 1395 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) { 1396 pdu_len = skb->data[0] << 8 | skb->data[1]; 1397 1398 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE); 1399 1400 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) { 1401 pr_err("Malformed AGF PDU\n"); 1402 return; 1403 } 1404 1405 ptype = nfc_llcp_ptype(skb); 1406 1407 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF) 1408 goto next; 1409 1410 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL); 1411 if (new_skb == NULL) { 1412 pr_err("Could not allocate PDU\n"); 1413 return; 1414 } 1415 1416 skb_put_data(new_skb, skb->data, pdu_len); 1417 1418 nfc_llcp_rx_skb(local, new_skb); 1419 1420 kfree_skb(new_skb); 1421 next: 1422 skb_pull(skb, pdu_len); 1423 } 1424 } 1425 1426 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb) 1427 { 1428 u8 dsap, ssap, ptype; 1429 1430 ptype = nfc_llcp_ptype(skb); 1431 dsap = nfc_llcp_dsap(skb); 1432 ssap = nfc_llcp_ssap(skb); 1433 1434 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); 1435 1436 if (ptype != LLCP_PDU_SYMM) 1437 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1, 1438 skb->data, skb->len, true); 1439 1440 switch (ptype) { 1441 case LLCP_PDU_SYMM: 1442 pr_debug("SYMM\n"); 1443 break; 1444 1445 case LLCP_PDU_UI: 1446 pr_debug("UI\n"); 1447 nfc_llcp_recv_ui(local, skb); 1448 break; 1449 1450 case LLCP_PDU_CONNECT: 1451 pr_debug("CONNECT\n"); 1452 nfc_llcp_recv_connect(local, skb); 1453 break; 1454 1455 case LLCP_PDU_DISC: 1456 pr_debug("DISC\n"); 1457 nfc_llcp_recv_disc(local, skb); 1458 break; 1459 1460 case LLCP_PDU_CC: 1461 pr_debug("CC\n"); 1462 nfc_llcp_recv_cc(local, skb); 1463 break; 1464 1465 case LLCP_PDU_DM: 1466 pr_debug("DM\n"); 1467 nfc_llcp_recv_dm(local, skb); 1468 break; 1469 1470 case LLCP_PDU_SNL: 1471 pr_debug("SNL\n"); 1472 nfc_llcp_recv_snl(local, skb); 1473 break; 1474 1475 case LLCP_PDU_I: 1476 case LLCP_PDU_RR: 1477 case LLCP_PDU_RNR: 1478 pr_debug("I frame\n"); 1479 nfc_llcp_recv_hdlc(local, skb); 1480 break; 1481 1482 case LLCP_PDU_AGF: 1483 pr_debug("AGF frame\n"); 1484 nfc_llcp_recv_agf(local, skb); 1485 break; 1486 } 1487 } 1488 1489 static void nfc_llcp_rx_work(struct work_struct *work) 1490 { 1491 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 1492 rx_work); 1493 struct sk_buff *skb; 1494 1495 skb = local->rx_pending; 1496 if (skb == NULL) { 1497 pr_debug("No pending SKB\n"); 1498 return; 1499 } 1500 1501 __net_timestamp(skb); 1502 1503 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX); 1504 1505 nfc_llcp_rx_skb(local, skb); 1506 1507 schedule_work(&local->tx_work); 1508 kfree_skb(local->rx_pending); 1509 local->rx_pending = NULL; 1510 } 1511 1512 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) 1513 { 1514 local->rx_pending = skb; 1515 del_timer(&local->link_timer); 1516 schedule_work(&local->rx_work); 1517 } 1518 1519 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) 1520 { 1521 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 1522 1523 if (err < 0) { 1524 pr_err("LLCP PDU receive err %d\n", err); 1525 return; 1526 } 1527 1528 __nfc_llcp_recv(local, skb); 1529 } 1530 1531 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) 1532 { 1533 struct nfc_llcp_local *local; 1534 1535 local = nfc_llcp_find_local(dev); 1536 if (local == NULL) { 1537 kfree_skb(skb); 1538 return -ENODEV; 1539 } 1540 1541 __nfc_llcp_recv(local, skb); 1542 1543 nfc_llcp_local_put(local); 1544 1545 return 0; 1546 } 1547 1548 void nfc_llcp_mac_is_down(struct nfc_dev *dev) 1549 { 1550 struct nfc_llcp_local *local; 1551 1552 local = nfc_llcp_find_local(dev); 1553 if (local == NULL) 1554 return; 1555 1556 local->remote_miu = LLCP_DEFAULT_MIU; 1557 local->remote_lto = LLCP_DEFAULT_LTO; 1558 1559 /* Close and purge all existing sockets */ 1560 nfc_llcp_socket_release(local, true, 0); 1561 1562 nfc_llcp_local_put(local); 1563 } 1564 1565 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, 1566 u8 comm_mode, u8 rf_mode) 1567 { 1568 struct nfc_llcp_local *local; 1569 1570 pr_debug("rf mode %d\n", rf_mode); 1571 1572 local = nfc_llcp_find_local(dev); 1573 if (local == NULL) 1574 return; 1575 1576 local->target_idx = target_idx; 1577 local->comm_mode = comm_mode; 1578 local->rf_mode = rf_mode; 1579 1580 if (rf_mode == NFC_RF_INITIATOR) { 1581 pr_debug("Queueing Tx work\n"); 1582 1583 schedule_work(&local->tx_work); 1584 } else { 1585 mod_timer(&local->link_timer, 1586 jiffies + msecs_to_jiffies(local->remote_lto)); 1587 } 1588 1589 nfc_llcp_local_put(local); 1590 } 1591 1592 int nfc_llcp_register_device(struct nfc_dev *ndev) 1593 { 1594 struct nfc_llcp_local *local; 1595 1596 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); 1597 if (local == NULL) 1598 return -ENOMEM; 1599 1600 local->dev = ndev; 1601 INIT_LIST_HEAD(&local->list); 1602 kref_init(&local->ref); 1603 mutex_init(&local->sdp_lock); 1604 timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0); 1605 1606 skb_queue_head_init(&local->tx_queue); 1607 INIT_WORK(&local->tx_work, nfc_llcp_tx_work); 1608 1609 local->rx_pending = NULL; 1610 INIT_WORK(&local->rx_work, nfc_llcp_rx_work); 1611 1612 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); 1613 1614 rwlock_init(&local->sockets.lock); 1615 rwlock_init(&local->connecting_sockets.lock); 1616 rwlock_init(&local->raw_sockets.lock); 1617 1618 local->lto = 150; /* 1500 ms */ 1619 local->rw = LLCP_MAX_RW; 1620 local->miux = cpu_to_be16(LLCP_MAX_MIUX); 1621 local->local_wks = 0x1; /* LLC Link Management */ 1622 1623 nfc_llcp_build_gb(local); 1624 1625 local->remote_miu = LLCP_DEFAULT_MIU; 1626 local->remote_lto = LLCP_DEFAULT_LTO; 1627 1628 mutex_init(&local->sdreq_lock); 1629 INIT_HLIST_HEAD(&local->pending_sdreqs); 1630 timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0); 1631 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); 1632 1633 spin_lock(&llcp_devices_lock); 1634 list_add(&local->list, &llcp_devices); 1635 spin_unlock(&llcp_devices_lock); 1636 1637 return 0; 1638 } 1639 1640 void nfc_llcp_unregister_device(struct nfc_dev *dev) 1641 { 1642 struct nfc_llcp_local *local = nfc_llcp_remove_local(dev); 1643 1644 if (local == NULL) { 1645 pr_debug("No such device\n"); 1646 return; 1647 } 1648 1649 local_cleanup(local); 1650 1651 nfc_llcp_local_put(local); 1652 } 1653 1654 int __init nfc_llcp_init(void) 1655 { 1656 return nfc_llcp_sock_init(); 1657 } 1658 1659 void nfc_llcp_exit(void) 1660 { 1661 nfc_llcp_sock_exit(); 1662 } 1663