1/* 2 * Copyright (C) 2011 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the 16 * Free Software Foundation, Inc., 17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 */ 19 20#define pr_fmt(fmt) "llcp: %s: " fmt, __func__ 21 22#include <linux/init.h> 23#include <linux/kernel.h> 24#include <linux/list.h> 25#include <linux/nfc.h> 26 27#include "nfc.h" 28#include "llcp.h" 29 30static u8 llcp_magic[3] = {0x46, 0x66, 0x6d}; 31 32static struct list_head llcp_devices; 33 34static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb); 35 36void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk) 37{ 38 write_lock(&l->lock); 39 sk_add_node(sk, &l->head); 40 write_unlock(&l->lock); 41} 42 43void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk) 44{ 45 write_lock(&l->lock); 46 sk_del_node_init(sk); 47 write_unlock(&l->lock); 48} 49 50void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock) 51{ 52 sock->remote_rw = LLCP_DEFAULT_RW; 53 sock->remote_miu = LLCP_MAX_MIU + 1; 54} 55 56static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock) 57{ 58 struct nfc_llcp_local *local = sock->local; 59 struct sk_buff *s, *tmp; 60 61 pr_debug("%p\n", &sock->sk); 62 63 skb_queue_purge(&sock->tx_queue); 64 skb_queue_purge(&sock->tx_pending_queue); 65 66 if (local == NULL) 67 return; 68 69 /* Search for local pending SKBs that are related to this socket */ 70 skb_queue_walk_safe(&local->tx_queue, s, tmp) { 71 if (s->sk != &sock->sk) 72 continue; 73 74 skb_unlink(s, &local->tx_queue); 75 kfree_skb(s); 76 } 77} 78 79static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device, 80 int err) 81{ 82 struct sock *sk; 83 struct hlist_node *tmp; 84 struct nfc_llcp_sock *llcp_sock; 85 86 skb_queue_purge(&local->tx_queue); 87 88 write_lock(&local->sockets.lock); 89 90 sk_for_each_safe(sk, tmp, &local->sockets.head) { 91 llcp_sock = nfc_llcp_sock(sk); 92 93 bh_lock_sock(sk); 94 95 nfc_llcp_socket_purge(llcp_sock); 96 97 if (sk->sk_state == LLCP_CONNECTED) 98 nfc_put_device(llcp_sock->dev); 99 100 if (sk->sk_state == LLCP_LISTEN) { 101 struct nfc_llcp_sock *lsk, *n; 102 struct sock *accept_sk; 103 104 list_for_each_entry_safe(lsk, n, 105 &llcp_sock->accept_queue, 106 accept_queue) { 107 accept_sk = &lsk->sk; 108 bh_lock_sock(accept_sk); 109 110 nfc_llcp_accept_unlink(accept_sk); 111 112 if (err) 113 accept_sk->sk_err = err; 114 accept_sk->sk_state = LLCP_CLOSED; 115 accept_sk->sk_state_change(sk); 116 117 bh_unlock_sock(accept_sk); 118 } 119 } 120 121 if (err) 122 sk->sk_err = err; 123 sk->sk_state = LLCP_CLOSED; 124 sk->sk_state_change(sk); 125 126 bh_unlock_sock(sk); 127 128 sk_del_node_init(sk); 129 } 130 131 write_unlock(&local->sockets.lock); 132 133 /* If we still have a device, we keep the RAW sockets alive */ 134 if (device == true) 135 return; 136 137 write_lock(&local->raw_sockets.lock); 138 139 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) { 140 llcp_sock = nfc_llcp_sock(sk); 141 142 bh_lock_sock(sk); 143 144 nfc_llcp_socket_purge(llcp_sock); 145 146 if (err) 147 sk->sk_err = err; 148 sk->sk_state = LLCP_CLOSED; 149 sk->sk_state_change(sk); 150 151 bh_unlock_sock(sk); 152 153 sk_del_node_init(sk); 154 } 155 156 write_unlock(&local->raw_sockets.lock); 157} 158 159struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local) 160{ 161 kref_get(&local->ref); 162 163 return local; 164} 165 166static void local_cleanup(struct nfc_llcp_local *local) 167{ 168 nfc_llcp_socket_release(local, false, ENXIO); 169 del_timer_sync(&local->link_timer); 170 skb_queue_purge(&local->tx_queue); 171 cancel_work_sync(&local->tx_work); 172 cancel_work_sync(&local->rx_work); 173 cancel_work_sync(&local->timeout_work); 174 kfree_skb(local->rx_pending); 175 del_timer_sync(&local->sdreq_timer); 176 cancel_work_sync(&local->sdreq_timeout_work); 177 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs); 178} 179 180static void local_release(struct kref *ref) 181{ 182 struct nfc_llcp_local *local; 183 184 local = container_of(ref, struct nfc_llcp_local, ref); 185 186 list_del(&local->list); 187 local_cleanup(local); 188 kfree(local); 189} 190 191int nfc_llcp_local_put(struct nfc_llcp_local *local) 192{ 193 if (local == NULL) 194 return 0; 195 196 return kref_put(&local->ref, local_release); 197} 198 199static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local, 200 u8 ssap, u8 dsap) 201{ 202 struct sock *sk; 203 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 204 205 pr_debug("ssap dsap %d %d\n", ssap, dsap); 206 207 if (ssap == 0 && dsap == 0) 208 return NULL; 209 210 read_lock(&local->sockets.lock); 211 212 llcp_sock = NULL; 213 214 sk_for_each(sk, &local->sockets.head) { 215 tmp_sock = nfc_llcp_sock(sk); 216 217 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) { 218 llcp_sock = tmp_sock; 219 break; 220 } 221 } 222 223 read_unlock(&local->sockets.lock); 224 225 if (llcp_sock == NULL) 226 return NULL; 227 228 sock_hold(&llcp_sock->sk); 229 230 return llcp_sock; 231} 232 233static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) 234{ 235 sock_put(&sock->sk); 236} 237 238static void nfc_llcp_timeout_work(struct work_struct *work) 239{ 240 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 241 timeout_work); 242 243 nfc_dep_link_down(local->dev); 244} 245 246static void nfc_llcp_symm_timer(unsigned long data) 247{ 248 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 249 250 pr_err("SYMM timeout\n"); 251 252 schedule_work(&local->timeout_work); 253} 254 255static void nfc_llcp_sdreq_timeout_work(struct work_struct *work) 256{ 257 unsigned long time; 258 HLIST_HEAD(nl_sdres_list); 259 struct hlist_node *n; 260 struct nfc_llcp_sdp_tlv *sdp; 261 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 262 sdreq_timeout_work); 263 264 mutex_lock(&local->sdreq_lock); 265 266 time = jiffies - msecs_to_jiffies(3 * local->remote_lto); 267 268 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) { 269 if (time_after(sdp->time, time)) 270 continue; 271 272 sdp->sap = LLCP_SDP_UNBOUND; 273 274 hlist_del(&sdp->node); 275 276 hlist_add_head(&sdp->node, &nl_sdres_list); 277 } 278 279 if (!hlist_empty(&local->pending_sdreqs)) 280 mod_timer(&local->sdreq_timer, 281 jiffies + msecs_to_jiffies(3 * local->remote_lto)); 282 283 mutex_unlock(&local->sdreq_lock); 284 285 if (!hlist_empty(&nl_sdres_list)) 286 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 287} 288 289static void nfc_llcp_sdreq_timer(unsigned long data) 290{ 291 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 292 293 schedule_work(&local->sdreq_timeout_work); 294} 295 296struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) 297{ 298 struct nfc_llcp_local *local, *n; 299 300 list_for_each_entry_safe(local, n, &llcp_devices, list) 301 if (local->dev == dev) 302 return local; 303 304 pr_debug("No device found\n"); 305 306 return NULL; 307} 308 309static char *wks[] = { 310 NULL, 311 NULL, /* SDP */ 312 "urn:nfc:sn:ip", 313 "urn:nfc:sn:obex", 314 "urn:nfc:sn:snep", 315}; 316 317static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len) 318{ 319 int sap, num_wks; 320 321 pr_debug("%s\n", service_name); 322 323 if (service_name == NULL) 324 return -EINVAL; 325 326 num_wks = ARRAY_SIZE(wks); 327 328 for (sap = 0; sap < num_wks; sap++) { 329 if (wks[sap] == NULL) 330 continue; 331 332 if (strncmp(wks[sap], service_name, service_name_len) == 0) 333 return sap; 334 } 335 336 return -EINVAL; 337} 338 339static 340struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local, 341 u8 *sn, size_t sn_len) 342{ 343 struct sock *sk; 344 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 345 346 pr_debug("sn %zd %p\n", sn_len, sn); 347 348 if (sn == NULL || sn_len == 0) 349 return NULL; 350 351 read_lock(&local->sockets.lock); 352 353 llcp_sock = NULL; 354 355 sk_for_each(sk, &local->sockets.head) { 356 tmp_sock = nfc_llcp_sock(sk); 357 358 pr_debug("llcp sock %p\n", tmp_sock); 359 360 if (tmp_sock->sk.sk_type == SOCK_STREAM && 361 tmp_sock->sk.sk_state != LLCP_LISTEN) 362 continue; 363 364 if (tmp_sock->sk.sk_type == SOCK_DGRAM && 365 tmp_sock->sk.sk_state != LLCP_BOUND) 366 continue; 367 368 if (tmp_sock->service_name == NULL || 369 tmp_sock->service_name_len == 0) 370 continue; 371 372 if (tmp_sock->service_name_len != sn_len) 373 continue; 374 375 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { 376 llcp_sock = tmp_sock; 377 break; 378 } 379 } 380 381 read_unlock(&local->sockets.lock); 382 383 pr_debug("Found llcp sock %p\n", llcp_sock); 384 385 return llcp_sock; 386} 387 388u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, 389 struct nfc_llcp_sock *sock) 390{ 391 mutex_lock(&local->sdp_lock); 392 393 if (sock->service_name != NULL && sock->service_name_len > 0) { 394 int ssap = nfc_llcp_wks_sap(sock->service_name, 395 sock->service_name_len); 396 397 if (ssap > 0) { 398 pr_debug("WKS %d\n", ssap); 399 400 /* This is a WKS, let's check if it's free */ 401 if (local->local_wks & BIT(ssap)) { 402 mutex_unlock(&local->sdp_lock); 403 404 return LLCP_SAP_MAX; 405 } 406 407 set_bit(ssap, &local->local_wks); 408 mutex_unlock(&local->sdp_lock); 409 410 return ssap; 411 } 412 413 /* 414 * Check if there already is a non WKS socket bound 415 * to this service name. 416 */ 417 if (nfc_llcp_sock_from_sn(local, sock->service_name, 418 sock->service_name_len) != NULL) { 419 mutex_unlock(&local->sdp_lock); 420 421 return LLCP_SAP_MAX; 422 } 423 424 mutex_unlock(&local->sdp_lock); 425 426 return LLCP_SDP_UNBOUND; 427 428 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) { 429 if (!test_bit(sock->ssap, &local->local_wks)) { 430 set_bit(sock->ssap, &local->local_wks); 431 mutex_unlock(&local->sdp_lock); 432 433 return sock->ssap; 434 } 435 } 436 437 mutex_unlock(&local->sdp_lock); 438 439 return LLCP_SAP_MAX; 440} 441 442u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) 443{ 444 u8 local_ssap; 445 446 mutex_lock(&local->sdp_lock); 447 448 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); 449 if (local_ssap == LLCP_LOCAL_NUM_SAP) { 450 mutex_unlock(&local->sdp_lock); 451 return LLCP_SAP_MAX; 452 } 453 454 set_bit(local_ssap, &local->local_sap); 455 456 mutex_unlock(&local->sdp_lock); 457 458 return local_ssap + LLCP_LOCAL_SAP_OFFSET; 459} 460 461void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) 462{ 463 u8 local_ssap; 464 unsigned long *sdp; 465 466 if (ssap < LLCP_WKS_NUM_SAP) { 467 local_ssap = ssap; 468 sdp = &local->local_wks; 469 } else if (ssap < LLCP_LOCAL_NUM_SAP) { 470 atomic_t *client_cnt; 471 472 local_ssap = ssap - LLCP_WKS_NUM_SAP; 473 sdp = &local->local_sdp; 474 client_cnt = &local->local_sdp_cnt[local_ssap]; 475 476 pr_debug("%d clients\n", atomic_read(client_cnt)); 477 478 mutex_lock(&local->sdp_lock); 479 480 if (atomic_dec_and_test(client_cnt)) { 481 struct nfc_llcp_sock *l_sock; 482 483 pr_debug("No more clients for SAP %d\n", ssap); 484 485 clear_bit(local_ssap, sdp); 486 487 /* Find the listening sock and set it back to UNBOUND */ 488 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP); 489 if (l_sock) { 490 l_sock->ssap = LLCP_SDP_UNBOUND; 491 nfc_llcp_sock_put(l_sock); 492 } 493 } 494 495 mutex_unlock(&local->sdp_lock); 496 497 return; 498 } else if (ssap < LLCP_MAX_SAP) { 499 local_ssap = ssap - LLCP_LOCAL_NUM_SAP; 500 sdp = &local->local_sap; 501 } else { 502 return; 503 } 504 505 mutex_lock(&local->sdp_lock); 506 507 clear_bit(local_ssap, sdp); 508 509 mutex_unlock(&local->sdp_lock); 510} 511 512static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local) 513{ 514 u8 ssap; 515 516 mutex_lock(&local->sdp_lock); 517 518 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); 519 if (ssap == LLCP_SDP_NUM_SAP) { 520 mutex_unlock(&local->sdp_lock); 521 522 return LLCP_SAP_MAX; 523 } 524 525 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); 526 527 set_bit(ssap, &local->local_sdp); 528 529 mutex_unlock(&local->sdp_lock); 530 531 return LLCP_WKS_NUM_SAP + ssap; 532} 533 534static int nfc_llcp_build_gb(struct nfc_llcp_local *local) 535{ 536 u8 *gb_cur, *version_tlv, version, version_length; 537 u8 *lto_tlv, lto_length; 538 u8 *wks_tlv, wks_length; 539 u8 *miux_tlv, miux_length; 540 u8 gb_len = 0; 541 int ret = 0; 542 543 version = LLCP_VERSION_11; 544 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, 545 1, &version_length); 546 gb_len += version_length; 547 548 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length); 549 gb_len += lto_length; 550 551 pr_debug("Local wks 0x%lx\n", local->local_wks); 552 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2, 553 &wks_length); 554 gb_len += wks_length; 555 556 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, 557 &miux_length); 558 gb_len += miux_length; 559 560 gb_len += ARRAY_SIZE(llcp_magic); 561 562 if (gb_len > NFC_MAX_GT_LEN) { 563 ret = -EINVAL; 564 goto out; 565 } 566 567 gb_cur = local->gb; 568 569 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); 570 gb_cur += ARRAY_SIZE(llcp_magic); 571 572 memcpy(gb_cur, version_tlv, version_length); 573 gb_cur += version_length; 574 575 memcpy(gb_cur, lto_tlv, lto_length); 576 gb_cur += lto_length; 577 578 memcpy(gb_cur, wks_tlv, wks_length); 579 gb_cur += wks_length; 580 581 memcpy(gb_cur, miux_tlv, miux_length); 582 gb_cur += miux_length; 583 584 local->gb_len = gb_len; 585 586out: 587 kfree(version_tlv); 588 kfree(lto_tlv); 589 kfree(wks_tlv); 590 kfree(miux_tlv); 591 592 return ret; 593} 594 595u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) 596{ 597 struct nfc_llcp_local *local; 598 599 local = nfc_llcp_find_local(dev); 600 if (local == NULL) { 601 *general_bytes_len = 0; 602 return NULL; 603 } 604 605 nfc_llcp_build_gb(local); 606 607 *general_bytes_len = local->gb_len; 608 609 return local->gb; 610} 611 612int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) 613{ 614 struct nfc_llcp_local *local = nfc_llcp_find_local(dev); 615 616 if (local == NULL) { 617 pr_err("No LLCP device\n"); 618 return -ENODEV; 619 } 620 if (gb_len < 3) 621 return -EINVAL; 622 623 memset(local->remote_gb, 0, NFC_MAX_GT_LEN); 624 memcpy(local->remote_gb, gb, gb_len); 625 local->remote_gb_len = gb_len; 626 627 if (memcmp(local->remote_gb, llcp_magic, 3)) { 628 pr_err("MAC does not support LLCP\n"); 629 return -EINVAL; 630 } 631 632 return nfc_llcp_parse_gb_tlv(local, 633 &local->remote_gb[3], 634 local->remote_gb_len - 3); 635} 636 637static u8 nfc_llcp_dsap(struct sk_buff *pdu) 638{ 639 return (pdu->data[0] & 0xfc) >> 2; 640} 641 642static u8 nfc_llcp_ptype(struct sk_buff *pdu) 643{ 644 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); 645} 646 647static u8 nfc_llcp_ssap(struct sk_buff *pdu) 648{ 649 return pdu->data[1] & 0x3f; 650} 651 652static u8 nfc_llcp_ns(struct sk_buff *pdu) 653{ 654 return pdu->data[2] >> 4; 655} 656 657static u8 nfc_llcp_nr(struct sk_buff *pdu) 658{ 659 return pdu->data[2] & 0xf; 660} 661 662static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) 663{ 664 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); 665 sock->send_n = (sock->send_n + 1) % 16; 666 sock->recv_ack_n = (sock->recv_n - 1) % 16; 667} 668 669void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, 670 struct sk_buff *skb, u8 direction) 671{ 672 struct sk_buff *skb_copy = NULL, *nskb; 673 struct sock *sk; 674 u8 *data; 675 676 read_lock(&local->raw_sockets.lock); 677 678 sk_for_each(sk, &local->raw_sockets.head) { 679 if (sk->sk_state != LLCP_BOUND) 680 continue; 681 682 if (skb_copy == NULL) { 683 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE, 684 GFP_ATOMIC); 685 686 if (skb_copy == NULL) 687 continue; 688 689 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE); 690 691 data[0] = local->dev ? local->dev->idx : 0xFF; 692 data[1] = direction; 693 } 694 695 nskb = skb_clone(skb_copy, GFP_ATOMIC); 696 if (!nskb) 697 continue; 698 699 if (sock_queue_rcv_skb(sk, nskb)) 700 kfree_skb(nskb); 701 } 702 703 read_unlock(&local->raw_sockets.lock); 704 705 kfree_skb(skb_copy); 706} 707 708static void nfc_llcp_tx_work(struct work_struct *work) 709{ 710 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 711 tx_work); 712 struct sk_buff *skb; 713 struct sock *sk; 714 struct nfc_llcp_sock *llcp_sock; 715 716 skb = skb_dequeue(&local->tx_queue); 717 if (skb != NULL) { 718 sk = skb->sk; 719 llcp_sock = nfc_llcp_sock(sk); 720 721 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { 722 nfc_llcp_send_symm(local->dev); 723 } else { 724 struct sk_buff *copy_skb = NULL; 725 u8 ptype = nfc_llcp_ptype(skb); 726 int ret; 727 728 pr_debug("Sending pending skb\n"); 729 print_hex_dump(KERN_DEBUG, "LLCP Tx: ", 730 DUMP_PREFIX_OFFSET, 16, 1, 731 skb->data, skb->len, true); 732 733 if (ptype == LLCP_PDU_I) 734 copy_skb = skb_copy(skb, GFP_ATOMIC); 735 736 __net_timestamp(skb); 737 738 nfc_llcp_send_to_raw_sock(local, skb, 739 NFC_LLCP_DIRECTION_TX); 740 741 ret = nfc_data_exchange(local->dev, local->target_idx, 742 skb, nfc_llcp_recv, local); 743 744 if (ret) { 745 kfree_skb(copy_skb); 746 goto out; 747 } 748 749 if (ptype == LLCP_PDU_I && copy_skb) 750 skb_queue_tail(&llcp_sock->tx_pending_queue, 751 copy_skb); 752 } 753 } else { 754 nfc_llcp_send_symm(local->dev); 755 } 756 757out: 758 mod_timer(&local->link_timer, 759 jiffies + msecs_to_jiffies(2 * local->remote_lto)); 760} 761 762static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, 763 u8 ssap) 764{ 765 struct sock *sk; 766 struct nfc_llcp_sock *llcp_sock; 767 768 read_lock(&local->connecting_sockets.lock); 769 770 sk_for_each(sk, &local->connecting_sockets.head) { 771 llcp_sock = nfc_llcp_sock(sk); 772 773 if (llcp_sock->ssap == ssap) { 774 sock_hold(&llcp_sock->sk); 775 goto out; 776 } 777 } 778 779 llcp_sock = NULL; 780 781out: 782 read_unlock(&local->connecting_sockets.lock); 783 784 return llcp_sock; 785} 786 787static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, 788 u8 *sn, size_t sn_len) 789{ 790 struct nfc_llcp_sock *llcp_sock; 791 792 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len); 793 794 if (llcp_sock == NULL) 795 return NULL; 796 797 sock_hold(&llcp_sock->sk); 798 799 return llcp_sock; 800} 801 802static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) 803{ 804 u8 *tlv = &skb->data[2], type, length; 805 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; 806 807 while (offset < tlv_array_len) { 808 type = tlv[0]; 809 length = tlv[1]; 810 811 pr_debug("type 0x%x length %d\n", type, length); 812 813 if (type == LLCP_TLV_SN) { 814 *sn_len = length; 815 return &tlv[2]; 816 } 817 818 offset += length + 2; 819 tlv += length + 2; 820 } 821 822 return NULL; 823} 824 825static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, 826 struct sk_buff *skb) 827{ 828 struct nfc_llcp_sock *llcp_sock; 829 struct nfc_llcp_ui_cb *ui_cb; 830 u8 dsap, ssap; 831 832 dsap = nfc_llcp_dsap(skb); 833 ssap = nfc_llcp_ssap(skb); 834 835 ui_cb = nfc_llcp_ui_skb_cb(skb); 836 ui_cb->dsap = dsap; 837 ui_cb->ssap = ssap; 838 839 pr_debug("%d %d\n", dsap, ssap); 840 841 /* We're looking for a bound socket, not a client one */ 842 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 843 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) 844 return; 845 846 /* There is no sequence with UI frames */ 847 skb_pull(skb, LLCP_HEADER_SIZE); 848 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 849 /* 850 * UI frames will be freed from the socket layer, so we 851 * need to keep them alive until someone receives them. 852 */ 853 skb_get(skb); 854 } else { 855 pr_err("Receive queue is full\n"); 856 } 857 858 nfc_llcp_sock_put(llcp_sock); 859} 860 861static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, 862 struct sk_buff *skb) 863{ 864 struct sock *new_sk, *parent; 865 struct nfc_llcp_sock *sock, *new_sock; 866 u8 dsap, ssap, reason; 867 868 dsap = nfc_llcp_dsap(skb); 869 ssap = nfc_llcp_ssap(skb); 870 871 pr_debug("%d %d\n", dsap, ssap); 872 873 if (dsap != LLCP_SAP_SDP) { 874 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 875 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { 876 reason = LLCP_DM_NOBOUND; 877 goto fail; 878 } 879 } else { 880 u8 *sn; 881 size_t sn_len; 882 883 sn = nfc_llcp_connect_sn(skb, &sn_len); 884 if (sn == NULL) { 885 reason = LLCP_DM_NOBOUND; 886 goto fail; 887 } 888 889 pr_debug("Service name length %zu\n", sn_len); 890 891 sock = nfc_llcp_sock_get_sn(local, sn, sn_len); 892 if (sock == NULL) { 893 reason = LLCP_DM_NOBOUND; 894 goto fail; 895 } 896 } 897 898 lock_sock(&sock->sk); 899 900 parent = &sock->sk; 901 902 if (sk_acceptq_is_full(parent)) { 903 reason = LLCP_DM_REJ; 904 release_sock(&sock->sk); 905 sock_put(&sock->sk); 906 goto fail; 907 } 908 909 if (sock->ssap == LLCP_SDP_UNBOUND) { 910 u8 ssap = nfc_llcp_reserve_sdp_ssap(local); 911 912 pr_debug("First client, reserving %d\n", ssap); 913 914 if (ssap == LLCP_SAP_MAX) { 915 reason = LLCP_DM_REJ; 916 release_sock(&sock->sk); 917 sock_put(&sock->sk); 918 goto fail; 919 } 920 921 sock->ssap = ssap; 922 } 923 924 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC); 925 if (new_sk == NULL) { 926 reason = LLCP_DM_REJ; 927 release_sock(&sock->sk); 928 sock_put(&sock->sk); 929 goto fail; 930 } 931 932 new_sock = nfc_llcp_sock(new_sk); 933 new_sock->dev = local->dev; 934 new_sock->local = nfc_llcp_local_get(local); 935 new_sock->rw = sock->rw; 936 new_sock->miux = sock->miux; 937 new_sock->remote_miu = local->remote_miu; 938 new_sock->nfc_protocol = sock->nfc_protocol; 939 new_sock->dsap = ssap; 940 new_sock->target_idx = local->target_idx; 941 new_sock->parent = parent; 942 new_sock->ssap = sock->ssap; 943 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { 944 atomic_t *client_count; 945 946 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); 947 948 client_count = 949 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; 950 951 atomic_inc(client_count); 952 new_sock->reserved_ssap = sock->ssap; 953 } 954 955 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], 956 skb->len - LLCP_HEADER_SIZE); 957 958 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); 959 960 nfc_llcp_sock_link(&local->sockets, new_sk); 961 962 nfc_llcp_accept_enqueue(&sock->sk, new_sk); 963 964 nfc_get_device(local->dev->idx); 965 966 new_sk->sk_state = LLCP_CONNECTED; 967 968 /* Wake the listening processes */ 969 parent->sk_data_ready(parent, 0); 970 971 /* Send CC */ 972 nfc_llcp_send_cc(new_sock); 973 974 release_sock(&sock->sk); 975 sock_put(&sock->sk); 976 977 return; 978 979fail: 980 /* Send DM */ 981 nfc_llcp_send_dm(local, dsap, ssap, reason); 982} 983 984int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 985{ 986 int nr_frames = 0; 987 struct nfc_llcp_local *local = sock->local; 988 989 pr_debug("Remote ready %d tx queue len %d remote rw %d", 990 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), 991 sock->remote_rw); 992 993 /* Try to queue some I frames for transmission */ 994 while (sock->remote_ready && 995 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) { 996 struct sk_buff *pdu; 997 998 pdu = skb_dequeue(&sock->tx_queue); 999 if (pdu == NULL) 1000 break; 1001 1002 /* Update N(S)/N(R) */ 1003 nfc_llcp_set_nrns(sock, pdu); 1004 1005 skb_queue_tail(&local->tx_queue, pdu); 1006 nr_frames++; 1007 } 1008 1009 return nr_frames; 1010} 1011 1012static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, 1013 struct sk_buff *skb) 1014{ 1015 struct nfc_llcp_sock *llcp_sock; 1016 struct sock *sk; 1017 u8 dsap, ssap, ptype, ns, nr; 1018 1019 ptype = nfc_llcp_ptype(skb); 1020 dsap = nfc_llcp_dsap(skb); 1021 ssap = nfc_llcp_ssap(skb); 1022 ns = nfc_llcp_ns(skb); 1023 nr = nfc_llcp_nr(skb); 1024 1025 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); 1026 1027 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1028 if (llcp_sock == NULL) { 1029 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1030 return; 1031 } 1032 1033 sk = &llcp_sock->sk; 1034 lock_sock(sk); 1035 if (sk->sk_state == LLCP_CLOSED) { 1036 release_sock(sk); 1037 nfc_llcp_sock_put(llcp_sock); 1038 } 1039 1040 /* Pass the payload upstream */ 1041 if (ptype == LLCP_PDU_I) { 1042 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); 1043 1044 if (ns == llcp_sock->recv_n) 1045 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; 1046 else 1047 pr_err("Received out of sequence I PDU\n"); 1048 1049 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); 1050 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 1051 /* 1052 * I frames will be freed from the socket layer, so we 1053 * need to keep them alive until someone receives them. 1054 */ 1055 skb_get(skb); 1056 } else { 1057 pr_err("Receive queue is full\n"); 1058 } 1059 } 1060 1061 /* Remove skbs from the pending queue */ 1062 if (llcp_sock->send_ack_n != nr) { 1063 struct sk_buff *s, *tmp; 1064 u8 n; 1065 1066 llcp_sock->send_ack_n = nr; 1067 1068 /* Remove and free all skbs until ns == nr */ 1069 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { 1070 n = nfc_llcp_ns(s); 1071 1072 skb_unlink(s, &llcp_sock->tx_pending_queue); 1073 kfree_skb(s); 1074 1075 if (n == nr) 1076 break; 1077 } 1078 1079 /* Re-queue the remaining skbs for transmission */ 1080 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, 1081 s, tmp) { 1082 skb_unlink(s, &llcp_sock->tx_pending_queue); 1083 skb_queue_head(&local->tx_queue, s); 1084 } 1085 } 1086 1087 if (ptype == LLCP_PDU_RR) 1088 llcp_sock->remote_ready = true; 1089 else if (ptype == LLCP_PDU_RNR) 1090 llcp_sock->remote_ready = false; 1091 1092 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) 1093 nfc_llcp_send_rr(llcp_sock); 1094 1095 release_sock(sk); 1096 nfc_llcp_sock_put(llcp_sock); 1097} 1098 1099static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, 1100 struct sk_buff *skb) 1101{ 1102 struct nfc_llcp_sock *llcp_sock; 1103 struct sock *sk; 1104 u8 dsap, ssap; 1105 1106 dsap = nfc_llcp_dsap(skb); 1107 ssap = nfc_llcp_ssap(skb); 1108 1109 if ((dsap == 0) && (ssap == 0)) { 1110 pr_debug("Connection termination"); 1111 nfc_dep_link_down(local->dev); 1112 return; 1113 } 1114 1115 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1116 if (llcp_sock == NULL) { 1117 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1118 return; 1119 } 1120 1121 sk = &llcp_sock->sk; 1122 lock_sock(sk); 1123 1124 nfc_llcp_socket_purge(llcp_sock); 1125 1126 if (sk->sk_state == LLCP_CLOSED) { 1127 release_sock(sk); 1128 nfc_llcp_sock_put(llcp_sock); 1129 } 1130 1131 if (sk->sk_state == LLCP_CONNECTED) { 1132 nfc_put_device(local->dev); 1133 sk->sk_state = LLCP_CLOSED; 1134 sk->sk_state_change(sk); 1135 } 1136 1137 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); 1138 1139 release_sock(sk); 1140 nfc_llcp_sock_put(llcp_sock); 1141} 1142 1143static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) 1144{ 1145 struct nfc_llcp_sock *llcp_sock; 1146 struct sock *sk; 1147 u8 dsap, ssap; 1148 1149 dsap = nfc_llcp_dsap(skb); 1150 ssap = nfc_llcp_ssap(skb); 1151 1152 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1153 if (llcp_sock == NULL) { 1154 pr_err("Invalid CC\n"); 1155 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1156 1157 return; 1158 } 1159 1160 sk = &llcp_sock->sk; 1161 1162 /* Unlink from connecting and link to the client array */ 1163 nfc_llcp_sock_unlink(&local->connecting_sockets, sk); 1164 nfc_llcp_sock_link(&local->sockets, sk); 1165 llcp_sock->dsap = ssap; 1166 1167 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], 1168 skb->len - LLCP_HEADER_SIZE); 1169 1170 sk->sk_state = LLCP_CONNECTED; 1171 sk->sk_state_change(sk); 1172 1173 nfc_llcp_sock_put(llcp_sock); 1174} 1175 1176static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb) 1177{ 1178 struct nfc_llcp_sock *llcp_sock; 1179 struct sock *sk; 1180 u8 dsap, ssap, reason; 1181 1182 dsap = nfc_llcp_dsap(skb); 1183 ssap = nfc_llcp_ssap(skb); 1184 reason = skb->data[2]; 1185 1186 pr_debug("%d %d reason %d\n", ssap, dsap, reason); 1187 1188 switch (reason) { 1189 case LLCP_DM_NOBOUND: 1190 case LLCP_DM_REJ: 1191 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1192 break; 1193 1194 default: 1195 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1196 break; 1197 } 1198 1199 if (llcp_sock == NULL) { 1200 pr_debug("Already closed\n"); 1201 return; 1202 } 1203 1204 sk = &llcp_sock->sk; 1205 1206 sk->sk_err = ENXIO; 1207 sk->sk_state = LLCP_CLOSED; 1208 sk->sk_state_change(sk); 1209 1210 nfc_llcp_sock_put(llcp_sock); 1211} 1212 1213static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, 1214 struct sk_buff *skb) 1215{ 1216 struct nfc_llcp_sock *llcp_sock; 1217 u8 dsap, ssap, *tlv, type, length, tid, sap; 1218 u16 tlv_len, offset; 1219 char *service_name; 1220 size_t service_name_len; 1221 struct nfc_llcp_sdp_tlv *sdp; 1222 HLIST_HEAD(llc_sdres_list); 1223 size_t sdres_tlvs_len; 1224 HLIST_HEAD(nl_sdres_list); 1225 1226 dsap = nfc_llcp_dsap(skb); 1227 ssap = nfc_llcp_ssap(skb); 1228 1229 pr_debug("%d %d\n", dsap, ssap); 1230 1231 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { 1232 pr_err("Wrong SNL SAP\n"); 1233 return; 1234 } 1235 1236 tlv = &skb->data[LLCP_HEADER_SIZE]; 1237 tlv_len = skb->len - LLCP_HEADER_SIZE; 1238 offset = 0; 1239 sdres_tlvs_len = 0; 1240 1241 while (offset < tlv_len) { 1242 type = tlv[0]; 1243 length = tlv[1]; 1244 1245 switch (type) { 1246 case LLCP_TLV_SDREQ: 1247 tid = tlv[2]; 1248 service_name = (char *) &tlv[3]; 1249 service_name_len = length - 1; 1250 1251 pr_debug("Looking for %.16s\n", service_name); 1252 1253 if (service_name_len == strlen("urn:nfc:sn:sdp") && 1254 !strncmp(service_name, "urn:nfc:sn:sdp", 1255 service_name_len)) { 1256 sap = 1; 1257 goto add_snl; 1258 } 1259 1260 llcp_sock = nfc_llcp_sock_from_sn(local, service_name, 1261 service_name_len); 1262 if (!llcp_sock) { 1263 sap = 0; 1264 goto add_snl; 1265 } 1266 1267 /* 1268 * We found a socket but its ssap has not been reserved 1269 * yet. We need to assign it for good and send a reply. 1270 * The ssap will be freed when the socket is closed. 1271 */ 1272 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { 1273 atomic_t *client_count; 1274 1275 sap = nfc_llcp_reserve_sdp_ssap(local); 1276 1277 pr_debug("Reserving %d\n", sap); 1278 1279 if (sap == LLCP_SAP_MAX) { 1280 sap = 0; 1281 goto add_snl; 1282 } 1283 1284 client_count = 1285 &local->local_sdp_cnt[sap - 1286 LLCP_WKS_NUM_SAP]; 1287 1288 atomic_inc(client_count); 1289 1290 llcp_sock->ssap = sap; 1291 llcp_sock->reserved_ssap = sap; 1292 } else { 1293 sap = llcp_sock->ssap; 1294 } 1295 1296 pr_debug("%p %d\n", llcp_sock, sap); 1297 1298add_snl: 1299 sdp = nfc_llcp_build_sdres_tlv(tid, sap); 1300 if (sdp == NULL) 1301 goto exit; 1302 1303 sdres_tlvs_len += sdp->tlv_len; 1304 hlist_add_head(&sdp->node, &llc_sdres_list); 1305 break; 1306 1307 case LLCP_TLV_SDRES: 1308 mutex_lock(&local->sdreq_lock); 1309 1310 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]); 1311 1312 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) { 1313 if (sdp->tid != tlv[2]) 1314 continue; 1315 1316 sdp->sap = tlv[3]; 1317 1318 pr_debug("Found: uri=%s, sap=%d\n", 1319 sdp->uri, sdp->sap); 1320 1321 hlist_del(&sdp->node); 1322 1323 hlist_add_head(&sdp->node, &nl_sdres_list); 1324 1325 break; 1326 } 1327 1328 mutex_unlock(&local->sdreq_lock); 1329 break; 1330 1331 default: 1332 pr_err("Invalid SNL tlv value 0x%x\n", type); 1333 break; 1334 } 1335 1336 offset += length + 2; 1337 tlv += length + 2; 1338 } 1339 1340exit: 1341 if (!hlist_empty(&nl_sdres_list)) 1342 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 1343 1344 if (!hlist_empty(&llc_sdres_list)) 1345 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len); 1346} 1347 1348static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb) 1349{ 1350 u8 ptype; 1351 u16 pdu_len; 1352 struct sk_buff *new_skb; 1353 1354 if (skb->len <= LLCP_HEADER_SIZE) { 1355 pr_err("Malformed AGF PDU\n"); 1356 return; 1357 } 1358 1359 skb_pull(skb, LLCP_HEADER_SIZE); 1360 1361 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) { 1362 pdu_len = skb->data[0] << 8 | skb->data[1]; 1363 1364 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE); 1365 1366 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) { 1367 pr_err("Malformed AGF PDU\n"); 1368 return; 1369 } 1370 1371 ptype = nfc_llcp_ptype(skb); 1372 1373 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF) 1374 goto next; 1375 1376 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL); 1377 if (new_skb == NULL) { 1378 pr_err("Could not allocate PDU\n"); 1379 return; 1380 } 1381 1382 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len); 1383 1384 nfc_llcp_rx_skb(local, new_skb); 1385 1386 kfree_skb(new_skb); 1387next: 1388 skb_pull(skb, pdu_len); 1389 } 1390} 1391 1392static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb) 1393{ 1394 u8 dsap, ssap, ptype; 1395 1396 ptype = nfc_llcp_ptype(skb); 1397 dsap = nfc_llcp_dsap(skb); 1398 ssap = nfc_llcp_ssap(skb); 1399 1400 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); 1401 1402 if (ptype != LLCP_PDU_SYMM) 1403 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET, 1404 16, 1, skb->data, skb->len, true); 1405 1406 switch (ptype) { 1407 case LLCP_PDU_SYMM: 1408 pr_debug("SYMM\n"); 1409 break; 1410 1411 case LLCP_PDU_UI: 1412 pr_debug("UI\n"); 1413 nfc_llcp_recv_ui(local, skb); 1414 break; 1415 1416 case LLCP_PDU_CONNECT: 1417 pr_debug("CONNECT\n"); 1418 nfc_llcp_recv_connect(local, skb); 1419 break; 1420 1421 case LLCP_PDU_DISC: 1422 pr_debug("DISC\n"); 1423 nfc_llcp_recv_disc(local, skb); 1424 break; 1425 1426 case LLCP_PDU_CC: 1427 pr_debug("CC\n"); 1428 nfc_llcp_recv_cc(local, skb); 1429 break; 1430 1431 case LLCP_PDU_DM: 1432 pr_debug("DM\n"); 1433 nfc_llcp_recv_dm(local, skb); 1434 break; 1435 1436 case LLCP_PDU_SNL: 1437 pr_debug("SNL\n"); 1438 nfc_llcp_recv_snl(local, skb); 1439 break; 1440 1441 case LLCP_PDU_I: 1442 case LLCP_PDU_RR: 1443 case LLCP_PDU_RNR: 1444 pr_debug("I frame\n"); 1445 nfc_llcp_recv_hdlc(local, skb); 1446 break; 1447 1448 case LLCP_PDU_AGF: 1449 pr_debug("AGF frame\n"); 1450 nfc_llcp_recv_agf(local, skb); 1451 break; 1452 } 1453} 1454 1455static void nfc_llcp_rx_work(struct work_struct *work) 1456{ 1457 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 1458 rx_work); 1459 struct sk_buff *skb; 1460 1461 skb = local->rx_pending; 1462 if (skb == NULL) { 1463 pr_debug("No pending SKB\n"); 1464 return; 1465 } 1466 1467 __net_timestamp(skb); 1468 1469 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX); 1470 1471 nfc_llcp_rx_skb(local, skb); 1472 1473 schedule_work(&local->tx_work); 1474 kfree_skb(local->rx_pending); 1475 local->rx_pending = NULL; 1476} 1477 1478static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) 1479{ 1480 local->rx_pending = skb; 1481 del_timer(&local->link_timer); 1482 schedule_work(&local->rx_work); 1483} 1484 1485void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) 1486{ 1487 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 1488 1489 pr_debug("Received an LLCP PDU\n"); 1490 if (err < 0) { 1491 pr_err("err %d\n", err); 1492 return; 1493 } 1494 1495 __nfc_llcp_recv(local, skb); 1496} 1497 1498int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) 1499{ 1500 struct nfc_llcp_local *local; 1501 1502 local = nfc_llcp_find_local(dev); 1503 if (local == NULL) 1504 return -ENODEV; 1505 1506 __nfc_llcp_recv(local, skb); 1507 1508 return 0; 1509} 1510 1511void nfc_llcp_mac_is_down(struct nfc_dev *dev) 1512{ 1513 struct nfc_llcp_local *local; 1514 1515 local = nfc_llcp_find_local(dev); 1516 if (local == NULL) 1517 return; 1518 1519 local->remote_miu = LLCP_DEFAULT_MIU; 1520 local->remote_lto = LLCP_DEFAULT_LTO; 1521 1522 /* Close and purge all existing sockets */ 1523 nfc_llcp_socket_release(local, true, 0); 1524} 1525 1526void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, 1527 u8 comm_mode, u8 rf_mode) 1528{ 1529 struct nfc_llcp_local *local; 1530 1531 pr_debug("rf mode %d\n", rf_mode); 1532 1533 local = nfc_llcp_find_local(dev); 1534 if (local == NULL) 1535 return; 1536 1537 local->target_idx = target_idx; 1538 local->comm_mode = comm_mode; 1539 local->rf_mode = rf_mode; 1540 1541 if (rf_mode == NFC_RF_INITIATOR) { 1542 pr_debug("Queueing Tx work\n"); 1543 1544 schedule_work(&local->tx_work); 1545 } else { 1546 mod_timer(&local->link_timer, 1547 jiffies + msecs_to_jiffies(local->remote_lto)); 1548 } 1549} 1550 1551int nfc_llcp_register_device(struct nfc_dev *ndev) 1552{ 1553 struct nfc_llcp_local *local; 1554 1555 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); 1556 if (local == NULL) 1557 return -ENOMEM; 1558 1559 local->dev = ndev; 1560 INIT_LIST_HEAD(&local->list); 1561 kref_init(&local->ref); 1562 mutex_init(&local->sdp_lock); 1563 init_timer(&local->link_timer); 1564 local->link_timer.data = (unsigned long) local; 1565 local->link_timer.function = nfc_llcp_symm_timer; 1566 1567 skb_queue_head_init(&local->tx_queue); 1568 INIT_WORK(&local->tx_work, nfc_llcp_tx_work); 1569 1570 local->rx_pending = NULL; 1571 INIT_WORK(&local->rx_work, nfc_llcp_rx_work); 1572 1573 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); 1574 1575 rwlock_init(&local->sockets.lock); 1576 rwlock_init(&local->connecting_sockets.lock); 1577 rwlock_init(&local->raw_sockets.lock); 1578 1579 local->lto = 150; /* 1500 ms */ 1580 local->rw = LLCP_MAX_RW; 1581 local->miux = cpu_to_be16(LLCP_MAX_MIUX); 1582 1583 nfc_llcp_build_gb(local); 1584 1585 local->remote_miu = LLCP_DEFAULT_MIU; 1586 local->remote_lto = LLCP_DEFAULT_LTO; 1587 1588 mutex_init(&local->sdreq_lock); 1589 INIT_HLIST_HEAD(&local->pending_sdreqs); 1590 init_timer(&local->sdreq_timer); 1591 local->sdreq_timer.data = (unsigned long) local; 1592 local->sdreq_timer.function = nfc_llcp_sdreq_timer; 1593 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); 1594 1595 list_add(&local->list, &llcp_devices); 1596 1597 return 0; 1598} 1599 1600void nfc_llcp_unregister_device(struct nfc_dev *dev) 1601{ 1602 struct nfc_llcp_local *local = nfc_llcp_find_local(dev); 1603 1604 if (local == NULL) { 1605 pr_debug("No such device\n"); 1606 return; 1607 } 1608 1609 local_cleanup(local); 1610 1611 nfc_llcp_local_put(local); 1612} 1613 1614int __init nfc_llcp_init(void) 1615{ 1616 INIT_LIST_HEAD(&llcp_devices); 1617 1618 return nfc_llcp_sock_init(); 1619} 1620 1621void nfc_llcp_exit(void) 1622{ 1623 nfc_llcp_sock_exit(); 1624} 1625