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