net/nfc/llcp/llcp.c

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