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                         struct sk_buff *copy_skb = NULL;
 660                         u8 ptype = nfc_llcp_ptype(skb);
 661                         int ret;
 662
 663                         pr_debug("Sending pending skb\n");
 664                         print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
 665                                        DUMP_PREFIX_OFFSET, 16, 1,
 666                                        skb->data, skb->len, true);
 667
 668                         if (ptype == LLCP_PDU_I)
 669                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 670
 671                         nfc_llcp_send_to_raw_sock(local, skb,
 672                                                   NFC_LLCP_DIRECTION_TX);
 673
 674                         ret = nfc_data_exchange(local->dev, local->target_idx,
 675                                                 skb, nfc_llcp_recv, local);
 676
 677                         if (ret) {
 678                                 kfree_skb(copy_skb);
 679                                 goto out;
 680                         }
 681
 682                         if (ptype == LLCP_PDU_I && copy_skb)
 683                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 684                                                copy_skb);
 685                 }
 686         } else {
 687                 nfc_llcp_send_symm(local->dev);
 688         }
 689
 690 out:
 691         mod_timer(&local->link_timer,
 692                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 693 }
 694
 695 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 696                                                           u8 ssap)
 697 {
 698         struct sock *sk;
 699         struct nfc_llcp_sock *llcp_sock;
 700         struct hlist_node *node;
 701
 702         read_lock(&local->connecting_sockets.lock);
 703
 704         sk_for_each(sk, node, &local->connecting_sockets.head) {
 705                 llcp_sock = nfc_llcp_sock(sk);
 706
 707                 if (llcp_sock->ssap == ssap) {
 708                         sock_hold(&llcp_sock->sk);
 709                         goto out;
 710                 }
 711         }
 712
 713         llcp_sock = NULL;
 714
 715 out:
 716         read_unlock(&local->connecting_sockets.lock);
 717
 718         return llcp_sock;
 719 }
 720
 721 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 722                                                   u8 *sn, size_t sn_len)
 723 {
 724         struct nfc_llcp_sock *llcp_sock;
 725
 726         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 727
 728         if (llcp_sock == NULL)
 729                 return NULL;
 730
 731         sock_hold(&llcp_sock->sk);
 732
 733         return llcp_sock;
 734 }
 735
 736 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
 737 {
 738         u8 *tlv = &skb->data[2], type, length;
 739         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 740
 741         while (offset < tlv_array_len) {
 742                 type = tlv[0];
 743                 length = tlv[1];
 744
 745                 pr_debug("type 0x%x length %d\n", type, length);
 746
 747                 if (type == LLCP_TLV_SN) {
 748                         *sn_len = length;
 749                         return &tlv[2];
 750                 }
 751
 752                 offset += length + 2;
 753                 tlv += length + 2;
 754         }
 755
 756         return NULL;
 757 }
 758
 759 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 760                              struct sk_buff *skb)
 761 {
 762         struct nfc_llcp_sock *llcp_sock;
 763         struct nfc_llcp_ui_cb *ui_cb;
 764         u8 dsap, ssap;
 765
 766         dsap = nfc_llcp_dsap(skb);
 767         ssap = nfc_llcp_ssap(skb);
 768
 769         ui_cb = nfc_llcp_ui_skb_cb(skb);
 770         ui_cb->dsap = dsap;
 771         ui_cb->ssap = ssap;
 772
 773         printk("%s %d %d\n", __func__, dsap, ssap);
 774
 775         pr_debug("%d %d\n", dsap, ssap);
 776
 777         /* We're looking for a bound socket, not a client one */
 778         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 779         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 780                 return;
 781
 782         /* There is no sequence with UI frames */
 783         skb_pull(skb, LLCP_HEADER_SIZE);
 784         if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 785                 pr_err("receive queue is full\n");
 786                 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
 787         }
 788
 789         nfc_llcp_sock_put(llcp_sock);
 790 }
 791
 792 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 793                                   struct sk_buff *skb)
 794 {
 795         struct sock *new_sk, *parent;
 796         struct nfc_llcp_sock *sock, *new_sock;
 797         u8 dsap, ssap, reason;
 798
 799         dsap = nfc_llcp_dsap(skb);
 800         ssap = nfc_llcp_ssap(skb);
 801
 802         pr_debug("%d %d\n", dsap, ssap);
 803
 804         if (dsap != LLCP_SAP_SDP) {
 805                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 806                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 807                         reason = LLCP_DM_NOBOUND;
 808                         goto fail;
 809                 }
 810         } else {
 811                 u8 *sn;
 812                 size_t sn_len;
 813
 814                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 815                 if (sn == NULL) {
 816                         reason = LLCP_DM_NOBOUND;
 817                         goto fail;
 818                 }
 819
 820                 pr_debug("Service name length %zu\n", sn_len);
 821
 822                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 823                 if (sock == NULL) {
 824                         reason = LLCP_DM_NOBOUND;
 825                         goto fail;
 826                 }
 827         }
 828
 829         lock_sock(&sock->sk);
 830
 831         parent = &sock->sk;
 832
 833         if (sk_acceptq_is_full(parent)) {
 834                 reason = LLCP_DM_REJ;
 835                 release_sock(&sock->sk);
 836                 sock_put(&sock->sk);
 837                 goto fail;
 838         }
 839
 840         if (sock->ssap == LLCP_SDP_UNBOUND) {
 841                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 842
 843                 pr_debug("First client, reserving %d\n", ssap);
 844
 845                 if (ssap == LLCP_SAP_MAX) {
 846                         reason = LLCP_DM_REJ;
 847                         release_sock(&sock->sk);
 848                         sock_put(&sock->sk);
 849                         goto fail;
 850                 }
 851
 852                 sock->ssap = ssap;
 853         }
 854
 855         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
 856         if (new_sk == NULL) {
 857                 reason = LLCP_DM_REJ;
 858                 release_sock(&sock->sk);
 859                 sock_put(&sock->sk);
 860                 goto fail;
 861         }
 862
 863         new_sock = nfc_llcp_sock(new_sk);
 864         new_sock->dev = local->dev;
 865         new_sock->local = nfc_llcp_local_get(local);
 866         new_sock->miu = local->remote_miu;
 867         new_sock->nfc_protocol = sock->nfc_protocol;
 868         new_sock->dsap = ssap;
 869         new_sock->target_idx = local->target_idx;
 870         new_sock->parent = parent;
 871         new_sock->ssap = sock->ssap;
 872         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 873                 atomic_t *client_count;
 874
 875                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 876
 877                 client_count =
 878                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 879
 880                 atomic_inc(client_count);
 881                 new_sock->reserved_ssap = sock->ssap;
 882         }
 883
 884         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 885                                       skb->len - LLCP_HEADER_SIZE);
 886
 887         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 888
 889         nfc_llcp_sock_link(&local->sockets, new_sk);
 890
 891         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 892
 893         nfc_get_device(local->dev->idx);
 894
 895         new_sk->sk_state = LLCP_CONNECTED;
 896
 897         /* Wake the listening processes */
 898         parent->sk_data_ready(parent, 0);
 899
 900         /* Send CC */
 901         nfc_llcp_send_cc(new_sock);
 902
 903         release_sock(&sock->sk);
 904         sock_put(&sock->sk);
 905
 906         return;
 907
 908 fail:
 909         /* Send DM */
 910         nfc_llcp_send_dm(local, dsap, ssap, reason);
 911 }
 912
 913 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
 914 {
 915         int nr_frames = 0;
 916         struct nfc_llcp_local *local = sock->local;
 917
 918         pr_debug("Remote ready %d tx queue len %d remote rw %d",
 919                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
 920                  sock->rw);
 921
 922         /* Try to queue some I frames for transmission */
 923         while (sock->remote_ready &&
 924                skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
 925                 struct sk_buff *pdu;
 926
 927                 pdu = skb_dequeue(&sock->tx_queue);
 928                 if (pdu == NULL)
 929                         break;
 930
 931                 /* Update N(S)/N(R) */
 932                 nfc_llcp_set_nrns(sock, pdu);
 933
 934                 skb_queue_tail(&local->tx_queue, pdu);
 935                 nr_frames++;
 936         }
 937
 938         return nr_frames;
 939 }
 940
 941 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
 942                                struct sk_buff *skb)
 943 {
 944         struct nfc_llcp_sock *llcp_sock;
 945         struct sock *sk;
 946         u8 dsap, ssap, ptype, ns, nr;
 947
 948         ptype = nfc_llcp_ptype(skb);
 949         dsap = nfc_llcp_dsap(skb);
 950         ssap = nfc_llcp_ssap(skb);
 951         ns = nfc_llcp_ns(skb);
 952         nr = nfc_llcp_nr(skb);
 953
 954         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
 955
 956         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
 957         if (llcp_sock == NULL) {
 958                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
 959                 return;
 960         }
 961
 962         sk = &llcp_sock->sk;
 963         lock_sock(sk);
 964         if (sk->sk_state == LLCP_CLOSED) {
 965                 release_sock(sk);
 966                 nfc_llcp_sock_put(llcp_sock);
 967         }
 968
 969         /* Pass the payload upstream */
 970         if (ptype == LLCP_PDU_I) {
 971                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
 972
 973                 if (ns == llcp_sock->recv_n)
 974                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
 975                 else
 976                         pr_err("Received out of sequence I PDU\n");
 977
 978                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
 979                 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 980                         pr_err("receive queue is full\n");
 981                         skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
 982                 }
 983         }
 984
 985         /* Remove skbs from the pending queue */
 986         if (llcp_sock->send_ack_n != nr) {
 987                 struct sk_buff *s, *tmp;
 988                 u8 n;
 989
 990                 llcp_sock->send_ack_n = nr;
 991
 992                 /* Remove and free all skbs until ns == nr */
 993                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
 994                         n = nfc_llcp_ns(s);
 995
 996                         skb_unlink(s, &llcp_sock->tx_pending_queue);
 997                         kfree_skb(s);
 998
 999                         if (n == nr)
1000                                 break;
1001                 }
1002
1003                 /* Re-queue the remaining skbs for transmission */
1004                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1005                                             s, tmp) {
1006                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1007                         skb_queue_head(&local->tx_queue, s);
1008                 }
1009         }
1010
1011         if (ptype == LLCP_PDU_RR)
1012                 llcp_sock->remote_ready = true;
1013         else if (ptype == LLCP_PDU_RNR)
1014                 llcp_sock->remote_ready = false;
1015
1016         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1017                 nfc_llcp_send_rr(llcp_sock);
1018
1019         release_sock(sk);
1020         nfc_llcp_sock_put(llcp_sock);
1021 }
1022
1023 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1024                                struct sk_buff *skb)
1025 {
1026         struct nfc_llcp_sock *llcp_sock;
1027         struct sock *sk;
1028         u8 dsap, ssap;
1029
1030         dsap = nfc_llcp_dsap(skb);
1031         ssap = nfc_llcp_ssap(skb);
1032
1033         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1034         if (llcp_sock == NULL) {
1035                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1036                 return;
1037         }
1038
1039         sk = &llcp_sock->sk;
1040         lock_sock(sk);
1041
1042         nfc_llcp_socket_purge(llcp_sock);
1043
1044         if (sk->sk_state == LLCP_CLOSED) {
1045                 release_sock(sk);
1046                 nfc_llcp_sock_put(llcp_sock);
1047         }
1048
1049         if (sk->sk_state == LLCP_CONNECTED) {
1050                 nfc_put_device(local->dev);
1051                 sk->sk_state = LLCP_CLOSED;
1052                 sk->sk_state_change(sk);
1053         }
1054
1055         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1056
1057         release_sock(sk);
1058         nfc_llcp_sock_put(llcp_sock);
1059 }
1060
1061 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1062 {
1063         struct nfc_llcp_sock *llcp_sock;
1064         struct sock *sk;
1065         u8 dsap, ssap;
1066
1067         dsap = nfc_llcp_dsap(skb);
1068         ssap = nfc_llcp_ssap(skb);
1069
1070         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1071         if (llcp_sock == NULL) {
1072                 pr_err("Invalid CC\n");
1073                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1074
1075                 return;
1076         }
1077
1078         sk = &llcp_sock->sk;
1079
1080         /* Unlink from connecting and link to the client array */
1081         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1082         nfc_llcp_sock_link(&local->sockets, sk);
1083         llcp_sock->dsap = ssap;
1084
1085         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1086                                       skb->len - LLCP_HEADER_SIZE);
1087
1088         sk->sk_state = LLCP_CONNECTED;
1089         sk->sk_state_change(sk);
1090
1091         nfc_llcp_sock_put(llcp_sock);
1092 }
1093
1094 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1095 {
1096         struct nfc_llcp_sock *llcp_sock;
1097         struct sock *sk;
1098         u8 dsap, ssap, reason;
1099
1100         dsap = nfc_llcp_dsap(skb);
1101         ssap = nfc_llcp_ssap(skb);
1102         reason = skb->data[2];
1103
1104         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1105
1106         switch (reason) {
1107         case LLCP_DM_NOBOUND:
1108         case LLCP_DM_REJ:
1109                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1110                 break;
1111
1112         default:
1113                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1114                 break;
1115         }
1116
1117         if (llcp_sock == NULL) {
1118                 pr_debug("Already closed\n");
1119                 return;
1120         }
1121
1122         sk = &llcp_sock->sk;
1123
1124         sk->sk_err = ENXIO;
1125         sk->sk_state = LLCP_CLOSED;
1126         sk->sk_state_change(sk);
1127
1128         nfc_llcp_sock_put(llcp_sock);
1129 }
1130
1131 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1132                               struct sk_buff *skb)
1133 {
1134         struct nfc_llcp_sock *llcp_sock;
1135         u8 dsap, ssap, *tlv, type, length, tid, sap;
1136         u16 tlv_len, offset;
1137         char *service_name;
1138         size_t service_name_len;
1139
1140         dsap = nfc_llcp_dsap(skb);
1141         ssap = nfc_llcp_ssap(skb);
1142
1143         pr_debug("%d %d\n", dsap, ssap);
1144
1145         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1146                 pr_err("Wrong SNL SAP\n");
1147                 return;
1148         }
1149
1150         tlv = &skb->data[LLCP_HEADER_SIZE];
1151         tlv_len = skb->len - LLCP_HEADER_SIZE;
1152         offset = 0;
1153
1154         while (offset < tlv_len) {
1155                 type = tlv[0];
1156                 length = tlv[1];
1157
1158                 switch (type) {
1159                 case LLCP_TLV_SDREQ:
1160                         tid = tlv[2];
1161                         service_name = (char *) &tlv[3];
1162                         service_name_len = length - 1;
1163
1164                         pr_debug("Looking for %.16s\n", service_name);
1165
1166                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1167                             !strncmp(service_name, "urn:nfc:sn:sdp",
1168                                      service_name_len)) {
1169                                 sap = 1;
1170                                 goto send_snl;
1171                         }
1172
1173                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1174                                                           service_name_len);
1175                         if (!llcp_sock) {
1176                                 sap = 0;
1177                                 goto send_snl;
1178                         }
1179
1180                         /*
1181                          * We found a socket but its ssap has not been reserved
1182                          * yet. We need to assign it for good and send a reply.
1183                          * The ssap will be freed when the socket is closed.
1184                          */
1185                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1186                                 atomic_t *client_count;
1187
1188                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1189
1190                                 pr_debug("Reserving %d\n", sap);
1191
1192                                 if (sap == LLCP_SAP_MAX) {
1193                                         sap = 0;
1194                                         goto send_snl;
1195                                 }
1196
1197                                 client_count =
1198                                         &local->local_sdp_cnt[sap -
1199                                                               LLCP_WKS_NUM_SAP];
1200
1201                                 atomic_inc(client_count);
1202
1203                                 llcp_sock->ssap = sap;
1204                                 llcp_sock->reserved_ssap = sap;
1205                         } else {
1206                                 sap = llcp_sock->ssap;
1207                         }
1208
1209                         pr_debug("%p %d\n", llcp_sock, sap);
1210
1211 send_snl:
1212                         nfc_llcp_send_snl(local, tid, sap);
1213                         break;
1214
1215                 default:
1216                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1217                         break;
1218                 }
1219
1220                 offset += length + 2;
1221                 tlv += length + 2;
1222         }
1223 }
1224
1225 static void nfc_llcp_rx_work(struct work_struct *work)
1226 {
1227         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1228                                                     rx_work);
1229         u8 dsap, ssap, ptype;
1230         struct sk_buff *skb;
1231
1232         skb = local->rx_pending;
1233         if (skb == NULL) {
1234                 pr_debug("No pending SKB\n");
1235                 return;
1236         }
1237
1238         ptype = nfc_llcp_ptype(skb);
1239         dsap = nfc_llcp_dsap(skb);
1240         ssap = nfc_llcp_ssap(skb);
1241
1242         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1243
1244         if (ptype != LLCP_PDU_SYMM)
1245                 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1246                                16, 1, skb->data, skb->len, true);
1247
1248         nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1249
1250         switch (ptype) {
1251         case LLCP_PDU_SYMM:
1252                 pr_debug("SYMM\n");
1253                 break;
1254
1255         case LLCP_PDU_UI:
1256                 pr_debug("UI\n");
1257                 nfc_llcp_recv_ui(local, skb);
1258                 break;
1259
1260         case LLCP_PDU_CONNECT:
1261                 pr_debug("CONNECT\n");
1262                 nfc_llcp_recv_connect(local, skb);
1263                 break;
1264
1265         case LLCP_PDU_DISC:
1266                 pr_debug("DISC\n");
1267                 nfc_llcp_recv_disc(local, skb);
1268                 break;
1269
1270         case LLCP_PDU_CC:
1271                 pr_debug("CC\n");
1272                 nfc_llcp_recv_cc(local, skb);
1273                 break;
1274
1275         case LLCP_PDU_DM:
1276                 pr_debug("DM\n");
1277                 nfc_llcp_recv_dm(local, skb);
1278                 break;
1279
1280         case LLCP_PDU_SNL:
1281                 pr_debug("SNL\n");
1282                 nfc_llcp_recv_snl(local, skb);
1283                 break;
1284
1285         case LLCP_PDU_I:
1286         case LLCP_PDU_RR:
1287         case LLCP_PDU_RNR:
1288                 pr_debug("I frame\n");
1289                 nfc_llcp_recv_hdlc(local, skb);
1290                 break;
1291
1292         }
1293
1294         schedule_work(&local->tx_work);
1295         kfree_skb(local->rx_pending);
1296         local->rx_pending = NULL;
1297 }
1298
1299 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1300 {
1301         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1302
1303         pr_debug("Received an LLCP PDU\n");
1304         if (err < 0) {
1305                 pr_err("err %d\n", err);
1306                 return;
1307         }
1308
1309         local->rx_pending = skb_get(skb);
1310         del_timer(&local->link_timer);
1311         schedule_work(&local->rx_work);
1312 }
1313
1314 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1315 {
1316         struct nfc_llcp_local *local;
1317
1318         local = nfc_llcp_find_local(dev);
1319         if (local == NULL)
1320                 return -ENODEV;
1321
1322         local->rx_pending = skb_get(skb);
1323         del_timer(&local->link_timer);
1324         schedule_work(&local->rx_work);
1325
1326         return 0;
1327 }
1328
1329 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1330 {
1331         struct nfc_llcp_local *local;
1332
1333         local = nfc_llcp_find_local(dev);
1334         if (local == NULL)
1335                 return;
1336
1337         /* Close and purge all existing sockets */
1338         nfc_llcp_socket_release(local, true);
1339 }
1340
1341 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1342                         u8 comm_mode, u8 rf_mode)
1343 {
1344         struct nfc_llcp_local *local;
1345
1346         pr_debug("rf mode %d\n", rf_mode);
1347
1348         local = nfc_llcp_find_local(dev);
1349         if (local == NULL)
1350                 return;
1351
1352         local->target_idx = target_idx;
1353         local->comm_mode = comm_mode;
1354         local->rf_mode = rf_mode;
1355
1356         if (rf_mode == NFC_RF_INITIATOR) {
1357                 pr_debug("Queueing Tx work\n");
1358
1359                 schedule_work(&local->tx_work);
1360         } else {
1361                 mod_timer(&local->link_timer,
1362                           jiffies + msecs_to_jiffies(local->remote_lto));
1363         }
1364 }
1365
1366 int nfc_llcp_register_device(struct nfc_dev *ndev)
1367 {
1368         struct nfc_llcp_local *local;
1369
1370         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1371         if (local == NULL)
1372                 return -ENOMEM;
1373
1374         local->dev = ndev;
1375         INIT_LIST_HEAD(&local->list);
1376         kref_init(&local->ref);
1377         mutex_init(&local->sdp_lock);
1378         init_timer(&local->link_timer);
1379         local->link_timer.data = (unsigned long) local;
1380         local->link_timer.function = nfc_llcp_symm_timer;
1381
1382         skb_queue_head_init(&local->tx_queue);
1383         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1384
1385         local->rx_pending = NULL;
1386         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1387
1388         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1389
1390         rwlock_init(&local->sockets.lock);
1391         rwlock_init(&local->connecting_sockets.lock);
1392         rwlock_init(&local->raw_sockets.lock);
1393
1394         local->lto = 150; /* 1500 ms */
1395         local->rw = LLCP_MAX_RW;
1396         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1397
1398         nfc_llcp_build_gb(local);
1399
1400         local->remote_miu = LLCP_DEFAULT_MIU;
1401         local->remote_lto = LLCP_DEFAULT_LTO;
1402
1403         list_add(&local->list, &llcp_devices);
1404
1405         return 0;
1406 }
1407
1408 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1409 {
1410         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1411
1412         if (local == NULL) {
1413                 pr_debug("No such device\n");
1414                 return;
1415         }
1416
1417         nfc_llcp_local_put(local);
1418 }
1419
1420 int __init nfc_llcp_init(void)
1421 {
1422         INIT_LIST_HEAD(&llcp_devices);
1423
1424         return nfc_llcp_sock_init();
1425 }
1426
1427 void nfc_llcp_exit(void)
1428 {
1429         nfc_llcp_sock_exit();
1430 }