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