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 *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, node, 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 hlist_node *node;
 175         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 176
 177         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 178
 179         if (ssap == 0 && dsap == 0)
 180                 return NULL;
 181
 182         read_lock(&local->sockets.lock);
 183
 184         llcp_sock = NULL;
 185
 186         sk_for_each(sk, node, &local->sockets.head) {
 187                 tmp_sock = nfc_llcp_sock(sk);
 188
 189                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 190                         llcp_sock = tmp_sock;
 191                         break;
 192                 }
 193         }
 194
 195         read_unlock(&local->sockets.lock);
 196
 197         if (llcp_sock == NULL)
 198                 return NULL;
 199
 200         sock_hold(&llcp_sock->sk);
 201
 202         return llcp_sock;
 203 }
 204
 205 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 206 {
 207         sock_put(&sock->sk);
 208 }
 209
 210 static void nfc_llcp_timeout_work(struct work_struct *work)
 211 {
 212         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 213                                                     timeout_work);
 214
 215         nfc_dep_link_down(local->dev);
 216 }
 217
 218 static void nfc_llcp_symm_timer(unsigned long data)
 219 {
 220         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 221
 222         pr_err("SYMM timeout\n");
 223
 224         schedule_work(&local->timeout_work);
 225 }
 226
 227 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 228 {
 229         struct nfc_llcp_local *local, *n;
 230
 231         list_for_each_entry_safe(local, n, &llcp_devices, list)
 232                 if (local->dev == dev)
 233                         return local;
 234
 235         pr_debug("No device found\n");
 236
 237         return NULL;
 238 }
 239
 240 static char *wks[] = {
 241         NULL,
 242         NULL, /* SDP */
 243         "urn:nfc:sn:ip",
 244         "urn:nfc:sn:obex",
 245         "urn:nfc:sn:snep",
 246 };
 247
 248 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
 249 {
 250         int sap, num_wks;
 251
 252         pr_debug("%s\n", service_name);
 253
 254         if (service_name == NULL)
 255                 return -EINVAL;
 256
 257         num_wks = ARRAY_SIZE(wks);
 258
 259         for (sap = 0; sap < num_wks; sap++) {
 260                 if (wks[sap] == NULL)
 261                         continue;
 262
 263                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 264                         return sap;
 265         }
 266
 267         return -EINVAL;
 268 }
 269
 270 static
 271 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 272                                             u8 *sn, size_t sn_len)
 273 {
 274         struct sock *sk;
 275         struct hlist_node *node;
 276         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 277
 278         pr_debug("sn %zd %p\n", sn_len, sn);
 279
 280         if (sn == NULL || sn_len == 0)
 281                 return NULL;
 282
 283         read_lock(&local->sockets.lock);
 284
 285         llcp_sock = NULL;
 286
 287         sk_for_each(sk, node, &local->sockets.head) {
 288                 tmp_sock = nfc_llcp_sock(sk);
 289
 290                 pr_debug("llcp sock %p\n", tmp_sock);
 291
 292                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 293                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 294                         continue;
 295
 296                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 297                     tmp_sock->sk.sk_state != LLCP_BOUND)
 298                         continue;
 299
 300                 if (tmp_sock->service_name == NULL ||
 301                     tmp_sock->service_name_len == 0)
 302                         continue;
 303
 304                 if (tmp_sock->service_name_len != sn_len)
 305                         continue;
 306
 307                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 308                         llcp_sock = tmp_sock;
 309                         break;
 310                 }
 311         }
 312
 313         read_unlock(&local->sockets.lock);
 314
 315         pr_debug("Found llcp sock %p\n", llcp_sock);
 316
 317         return llcp_sock;
 318 }
 319
 320 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 321                          struct nfc_llcp_sock *sock)
 322 {
 323         mutex_lock(&local->sdp_lock);
 324
 325         if (sock->service_name != NULL && sock->service_name_len > 0) {
 326                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 327                                             sock->service_name_len);
 328
 329                 if (ssap > 0) {
 330                         pr_debug("WKS %d\n", ssap);
 331
 332                         /* This is a WKS, let's check if it's free */
 333                         if (local->local_wks & BIT(ssap)) {
 334                                 mutex_unlock(&local->sdp_lock);
 335
 336                                 return LLCP_SAP_MAX;
 337                         }
 338
 339                         set_bit(ssap, &local->local_wks);
 340                         mutex_unlock(&local->sdp_lock);
 341
 342                         return ssap;
 343                 }
 344
 345                 /*
 346                  * Check if there already is a non WKS socket bound
 347                  * to this service name.
 348                  */
 349                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 350                                           sock->service_name_len) != NULL) {
 351                         mutex_unlock(&local->sdp_lock);
 352
 353                         return LLCP_SAP_MAX;
 354                 }
 355
 356                 mutex_unlock(&local->sdp_lock);
 357
 358                 return LLCP_SDP_UNBOUND;
 359
 360         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 361                 if (!test_bit(sock->ssap, &local->local_wks)) {
 362                         set_bit(sock->ssap, &local->local_wks);
 363                         mutex_unlock(&local->sdp_lock);
 364
 365                         return sock->ssap;
 366                 }
 367         }
 368
 369         mutex_unlock(&local->sdp_lock);
 370
 371         return LLCP_SAP_MAX;
 372 }
 373
 374 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 375 {
 376         u8 local_ssap;
 377
 378         mutex_lock(&local->sdp_lock);
 379
 380         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 381         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 382                 mutex_unlock(&local->sdp_lock);
 383                 return LLCP_SAP_MAX;
 384         }
 385
 386         set_bit(local_ssap, &local->local_sap);
 387
 388         mutex_unlock(&local->sdp_lock);
 389
 390         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 391 }
 392
 393 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 394 {
 395         u8 local_ssap;
 396         unsigned long *sdp;
 397
 398         if (ssap < LLCP_WKS_NUM_SAP) {
 399                 local_ssap = ssap;
 400                 sdp = &local->local_wks;
 401         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 402                 atomic_t *client_cnt;
 403
 404                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 405                 sdp = &local->local_sdp;
 406                 client_cnt = &local->local_sdp_cnt[local_ssap];
 407
 408                 pr_debug("%d clients\n", atomic_read(client_cnt));
 409
 410                 mutex_lock(&local->sdp_lock);
 411
 412                 if (atomic_dec_and_test(client_cnt)) {
 413                         struct nfc_llcp_sock *l_sock;
 414
 415                         pr_debug("No more clients for SAP %d\n", ssap);
 416
 417                         clear_bit(local_ssap, sdp);
 418
 419                         /* Find the listening sock and set it back to UNBOUND */
 420                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 421                         if (l_sock) {
 422                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 423                                 nfc_llcp_sock_put(l_sock);
 424                         }
 425                 }
 426
 427                 mutex_unlock(&local->sdp_lock);
 428
 429                 return;
 430         } else if (ssap < LLCP_MAX_SAP) {
 431                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 432                 sdp = &local->local_sap;
 433         } else {
 434                 return;
 435         }
 436
 437         mutex_lock(&local->sdp_lock);
 438
 439         clear_bit(local_ssap, sdp);
 440
 441         mutex_unlock(&local->sdp_lock);
 442 }
 443
 444 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 445 {
 446         u8 ssap;
 447
 448         mutex_lock(&local->sdp_lock);
 449
 450         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 451         if (ssap == LLCP_SDP_NUM_SAP) {
 452                 mutex_unlock(&local->sdp_lock);
 453
 454                 return LLCP_SAP_MAX;
 455         }
 456
 457         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 458
 459         set_bit(ssap, &local->local_sdp);
 460
 461         mutex_unlock(&local->sdp_lock);
 462
 463         return LLCP_WKS_NUM_SAP + ssap;
 464 }
 465
 466 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 467 {
 468         u8 *gb_cur, *version_tlv, version, version_length;
 469         u8 *lto_tlv, lto_length;
 470         u8 *wks_tlv, wks_length;
 471         u8 *miux_tlv, miux_length;
 472         u8 gb_len = 0;
 473         int ret = 0;
 474
 475         version = LLCP_VERSION_11;
 476         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 477                                          1, &version_length);
 478         gb_len += version_length;
 479
 480         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 481         gb_len += lto_length;
 482
 483         pr_debug("Local wks 0x%lx\n", local->local_wks);
 484         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
 485                                      &wks_length);
 486         gb_len += wks_length;
 487
 488         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 489                                       &miux_length);
 490         gb_len += miux_length;
 491
 492         gb_len += ARRAY_SIZE(llcp_magic);
 493
 494         if (gb_len > NFC_MAX_GT_LEN) {
 495                 ret = -EINVAL;
 496                 goto out;
 497         }
 498
 499         gb_cur = local->gb;
 500
 501         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 502         gb_cur += ARRAY_SIZE(llcp_magic);
 503
 504         memcpy(gb_cur, version_tlv, version_length);
 505         gb_cur += version_length;
 506
 507         memcpy(gb_cur, lto_tlv, lto_length);
 508         gb_cur += lto_length;
 509
 510         memcpy(gb_cur, wks_tlv, wks_length);
 511         gb_cur += wks_length;
 512
 513         memcpy(gb_cur, miux_tlv, miux_length);
 514         gb_cur += miux_length;
 515
 516         local->gb_len = gb_len;
 517
 518 out:
 519         kfree(version_tlv);
 520         kfree(lto_tlv);
 521         kfree(wks_tlv);
 522         kfree(miux_tlv);
 523
 524         return ret;
 525 }
 526
 527 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 528 {
 529         struct nfc_llcp_local *local;
 530
 531         local = nfc_llcp_find_local(dev);
 532         if (local == NULL) {
 533                 *general_bytes_len = 0;
 534                 return NULL;
 535         }
 536
 537         nfc_llcp_build_gb(local);
 538
 539         *general_bytes_len = local->gb_len;
 540
 541         return local->gb;
 542 }
 543
 544 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 545 {
 546         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
 547
 548         if (local == NULL) {
 549                 pr_err("No LLCP device\n");
 550                 return -ENODEV;
 551         }
 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 (local->remote_gb == NULL || local->remote_gb_len == 0)
 558                 return -ENODEV;
 559
 560         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 561                 pr_err("MAC does not support LLCP\n");
 562                 return -EINVAL;
 563         }
 564
 565         return nfc_llcp_parse_gb_tlv(local,
 566                                      &local->remote_gb[3],
 567                                      local->remote_gb_len - 3);
 568 }
 569
 570 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
 571 {
 572         return (pdu->data[0] & 0xfc) >> 2;
 573 }
 574
 575 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
 576 {
 577         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 578 }
 579
 580 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
 581 {
 582         return pdu->data[1] & 0x3f;
 583 }
 584
 585 static u8 nfc_llcp_ns(struct sk_buff *pdu)
 586 {
 587         return pdu->data[2] >> 4;
 588 }
 589
 590 static u8 nfc_llcp_nr(struct sk_buff *pdu)
 591 {
 592         return pdu->data[2] & 0xf;
 593 }
 594
 595 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 596 {
 597         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 598         sock->send_n = (sock->send_n + 1) % 16;
 599         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 600 }
 601
 602 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 603                                struct sk_buff *skb, u8 direction)
 604 {
 605         struct hlist_node *node;
 606         struct sk_buff *skb_copy = NULL, *nskb;
 607         struct sock *sk;
 608         u8 *data;
 609
 610         read_lock(&local->raw_sockets.lock);
 611
 612         sk_for_each(sk, node, &local->raw_sockets.head) {
 613                 if (sk->sk_state != LLCP_BOUND)
 614                         continue;
 615
 616                 if (skb_copy == NULL) {
 617                         skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
 618                                                GFP_ATOMIC);
 619
 620                         if (skb_copy == NULL)
 621                                 continue;
 622
 623                         data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
 624
 625                         data[0] = local->dev ? local->dev->idx : 0xFF;
 626                         data[1] = direction;
 627                 }
 628
 629                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 630                 if (!nskb)
 631                         continue;
 632
 633                 if (sock_queue_rcv_skb(sk, nskb))
 634                         kfree_skb(nskb);
 635         }
 636
 637         read_unlock(&local->raw_sockets.lock);
 638
 639         kfree_skb(skb_copy);
 640 }
 641
 642 static void nfc_llcp_tx_work(struct work_struct *work)
 643 {
 644         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 645                                                     tx_work);
 646         struct sk_buff *skb;
 647         struct sock *sk;
 648         struct nfc_llcp_sock *llcp_sock;
 649
 650         skb = skb_dequeue(&local->tx_queue);
 651         if (skb != NULL) {
 652                 sk = skb->sk;
 653                 llcp_sock = nfc_llcp_sock(sk);
 654
 655                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 656                         nfc_llcp_send_symm(local->dev);
 657                 } else {
 658                         struct sk_buff *copy_skb = NULL;
 659                         u8 ptype = nfc_llcp_ptype(skb);
 660                         int ret;
 661
 662                         pr_debug("Sending pending skb\n");
 663                         print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
 664                                        DUMP_PREFIX_OFFSET, 16, 1,
 665                                        skb->data, skb->len, true);
 666
 667                         if (ptype == LLCP_PDU_I)
 668                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 669
 670                         __net_timestamp(skb);
 671
 672                         nfc_llcp_send_to_raw_sock(local, skb,
 673                                                   NFC_LLCP_DIRECTION_TX);
 674
 675                         ret = nfc_data_exchange(local->dev, local->target_idx,
 676                                                 skb, nfc_llcp_recv, local);
 677
 678                         if (ret) {
 679                                 kfree_skb(copy_skb);
 680                                 goto out;
 681                         }
 682
 683                         if (ptype == LLCP_PDU_I && copy_skb)
 684                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 685                                                copy_skb);
 686                 }
 687         } else {
 688                 nfc_llcp_send_symm(local->dev);
 689         }
 690
 691 out:
 692         mod_timer(&local->link_timer,
 693                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 694 }
 695
 696 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 697                                                           u8 ssap)
 698 {
 699         struct sock *sk;
 700         struct nfc_llcp_sock *llcp_sock;
 701         struct hlist_node *node;
 702
 703         read_lock(&local->connecting_sockets.lock);
 704
 705         sk_for_each(sk, node, &local->connecting_sockets.head) {
 706                 llcp_sock = nfc_llcp_sock(sk);
 707
 708                 if (llcp_sock->ssap == ssap) {
 709                         sock_hold(&llcp_sock->sk);
 710                         goto out;
 711                 }
 712         }
 713
 714         llcp_sock = NULL;
 715
 716 out:
 717         read_unlock(&local->connecting_sockets.lock);
 718
 719         return llcp_sock;
 720 }
 721
 722 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 723                                                   u8 *sn, size_t sn_len)
 724 {
 725         struct nfc_llcp_sock *llcp_sock;
 726
 727         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 728
 729         if (llcp_sock == NULL)
 730                 return NULL;
 731
 732         sock_hold(&llcp_sock->sk);
 733
 734         return llcp_sock;
 735 }
 736
 737 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
 738 {
 739         u8 *tlv = &skb->data[2], type, length;
 740         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 741
 742         while (offset < tlv_array_len) {
 743                 type = tlv[0];
 744                 length = tlv[1];
 745
 746                 pr_debug("type 0x%x length %d\n", type, length);
 747
 748                 if (type == LLCP_TLV_SN) {
 749                         *sn_len = length;
 750                         return &tlv[2];
 751                 }
 752
 753                 offset += length + 2;
 754                 tlv += length + 2;
 755         }
 756
 757         return NULL;
 758 }
 759
 760 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 761                              struct sk_buff *skb)
 762 {
 763         struct nfc_llcp_sock *llcp_sock;
 764         struct nfc_llcp_ui_cb *ui_cb;
 765         u8 dsap, ssap;
 766
 767         dsap = nfc_llcp_dsap(skb);
 768         ssap = nfc_llcp_ssap(skb);
 769
 770         ui_cb = nfc_llcp_ui_skb_cb(skb);
 771         ui_cb->dsap = dsap;
 772         ui_cb->ssap = ssap;
 773
 774         printk("%s %d %d\n", __func__, dsap, ssap);
 775
 776         pr_debug("%d %d\n", dsap, ssap);
 777
 778         /* We're looking for a bound socket, not a client one */
 779         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 780         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 781                 return;
 782
 783         /* There is no sequence with UI frames */
 784         skb_pull(skb, LLCP_HEADER_SIZE);
 785         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 786                 /*
 787                  * UI frames will be freed from the socket layer, so we
 788                  * need to keep them alive until someone receives them.
 789                  */
 790                 skb_get(skb);
 791         } else {
 792                 pr_err("Receive queue is full\n");
 793                 kfree_skb(skb);
 794         }
 795
 796         nfc_llcp_sock_put(llcp_sock);
 797 }
 798
 799 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 800                                   struct sk_buff *skb)
 801 {
 802         struct sock *new_sk, *parent;
 803         struct nfc_llcp_sock *sock, *new_sock;
 804         u8 dsap, ssap, reason;
 805
 806         dsap = nfc_llcp_dsap(skb);
 807         ssap = nfc_llcp_ssap(skb);
 808
 809         pr_debug("%d %d\n", dsap, ssap);
 810
 811         if (dsap != LLCP_SAP_SDP) {
 812                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 813                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 814                         reason = LLCP_DM_NOBOUND;
 815                         goto fail;
 816                 }
 817         } else {
 818                 u8 *sn;
 819                 size_t sn_len;
 820
 821                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 822                 if (sn == NULL) {
 823                         reason = LLCP_DM_NOBOUND;
 824                         goto fail;
 825                 }
 826
 827                 pr_debug("Service name length %zu\n", sn_len);
 828
 829                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 830                 if (sock == NULL) {
 831                         reason = LLCP_DM_NOBOUND;
 832                         goto fail;
 833                 }
 834         }
 835
 836         lock_sock(&sock->sk);
 837
 838         parent = &sock->sk;
 839
 840         if (sk_acceptq_is_full(parent)) {
 841                 reason = LLCP_DM_REJ;
 842                 release_sock(&sock->sk);
 843                 sock_put(&sock->sk);
 844                 goto fail;
 845         }
 846
 847         if (sock->ssap == LLCP_SDP_UNBOUND) {
 848                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 849
 850                 pr_debug("First client, reserving %d\n", ssap);
 851
 852                 if (ssap == LLCP_SAP_MAX) {
 853                         reason = LLCP_DM_REJ;
 854                         release_sock(&sock->sk);
 855                         sock_put(&sock->sk);
 856                         goto fail;
 857                 }
 858
 859                 sock->ssap = ssap;
 860         }
 861
 862         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
 863         if (new_sk == NULL) {
 864                 reason = LLCP_DM_REJ;
 865                 release_sock(&sock->sk);
 866                 sock_put(&sock->sk);
 867                 goto fail;
 868         }
 869
 870         new_sock = nfc_llcp_sock(new_sk);
 871         new_sock->dev = local->dev;
 872         new_sock->local = nfc_llcp_local_get(local);
 873         new_sock->miu = local->remote_miu;
 874         new_sock->nfc_protocol = sock->nfc_protocol;
 875         new_sock->dsap = ssap;
 876         new_sock->target_idx = local->target_idx;
 877         new_sock->parent = parent;
 878         new_sock->ssap = sock->ssap;
 879         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 880                 atomic_t *client_count;
 881
 882                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 883
 884                 client_count =
 885                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 886
 887                 atomic_inc(client_count);
 888                 new_sock->reserved_ssap = sock->ssap;
 889         }
 890
 891         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 892                                       skb->len - LLCP_HEADER_SIZE);
 893
 894         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 895
 896         nfc_llcp_sock_link(&local->sockets, new_sk);
 897
 898         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 899
 900         nfc_get_device(local->dev->idx);
 901
 902         new_sk->sk_state = LLCP_CONNECTED;
 903
 904         /* Wake the listening processes */
 905         parent->sk_data_ready(parent, 0);
 906
 907         /* Send CC */
 908         nfc_llcp_send_cc(new_sock);
 909
 910         release_sock(&sock->sk);
 911         sock_put(&sock->sk);
 912
 913         return;
 914
 915 fail:
 916         /* Send DM */
 917         nfc_llcp_send_dm(local, dsap, ssap, reason);
 918 }
 919
 920 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
 921 {
 922         int nr_frames = 0;
 923         struct nfc_llcp_local *local = sock->local;
 924
 925         pr_debug("Remote ready %d tx queue len %d remote rw %d",
 926                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
 927                  sock->rw);
 928
 929         /* Try to queue some I frames for transmission */
 930         while (sock->remote_ready &&
 931                skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
 932                 struct sk_buff *pdu;
 933
 934                 pdu = skb_dequeue(&sock->tx_queue);
 935                 if (pdu == NULL)
 936                         break;
 937
 938                 /* Update N(S)/N(R) */
 939                 nfc_llcp_set_nrns(sock, pdu);
 940
 941                 skb_queue_tail(&local->tx_queue, pdu);
 942                 nr_frames++;
 943         }
 944
 945         return nr_frames;
 946 }
 947
 948 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
 949                                struct sk_buff *skb)
 950 {
 951         struct nfc_llcp_sock *llcp_sock;
 952         struct sock *sk;
 953         u8 dsap, ssap, ptype, ns, nr;
 954
 955         ptype = nfc_llcp_ptype(skb);
 956         dsap = nfc_llcp_dsap(skb);
 957         ssap = nfc_llcp_ssap(skb);
 958         ns = nfc_llcp_ns(skb);
 959         nr = nfc_llcp_nr(skb);
 960
 961         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
 962
 963         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
 964         if (llcp_sock == NULL) {
 965                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
 966                 return;
 967         }
 968
 969         sk = &llcp_sock->sk;
 970         lock_sock(sk);
 971         if (sk->sk_state == LLCP_CLOSED) {
 972                 release_sock(sk);
 973                 nfc_llcp_sock_put(llcp_sock);
 974         }
 975
 976         /* Pass the payload upstream */
 977         if (ptype == LLCP_PDU_I) {
 978                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
 979
 980                 if (ns == llcp_sock->recv_n)
 981                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
 982                 else
 983                         pr_err("Received out of sequence I PDU\n");
 984
 985                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
 986                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 987                         /*
 988                          * I frames will be freed from the socket layer, so we
 989                          * need to keep them alive until someone receives them.
 990                          */
 991                         skb_get(skb);
 992                 } else {
 993                         pr_err("Receive queue is full\n");
 994                         kfree_skb(skb);
 995                 }
 996         }
 997
 998         /* Remove skbs from the pending queue */
 999         if (llcp_sock->send_ack_n != nr) {
1000                 struct sk_buff *s, *tmp;
1001                 u8 n;
1002
1003                 llcp_sock->send_ack_n = nr;
1004
1005                 /* Remove and free all skbs until ns == nr */
1006                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1007                         n = nfc_llcp_ns(s);
1008
1009                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1010                         kfree_skb(s);
1011
1012                         if (n == nr)
1013                                 break;
1014                 }
1015
1016                 /* Re-queue the remaining skbs for transmission */
1017                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1018                                             s, tmp) {
1019                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1020                         skb_queue_head(&local->tx_queue, s);
1021                 }
1022         }
1023
1024         if (ptype == LLCP_PDU_RR)
1025                 llcp_sock->remote_ready = true;
1026         else if (ptype == LLCP_PDU_RNR)
1027                 llcp_sock->remote_ready = false;
1028
1029         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1030                 nfc_llcp_send_rr(llcp_sock);
1031
1032         release_sock(sk);
1033         nfc_llcp_sock_put(llcp_sock);
1034 }
1035
1036 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1037                                struct sk_buff *skb)
1038 {
1039         struct nfc_llcp_sock *llcp_sock;
1040         struct sock *sk;
1041         u8 dsap, ssap;
1042
1043         dsap = nfc_llcp_dsap(skb);
1044         ssap = nfc_llcp_ssap(skb);
1045
1046         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1047         if (llcp_sock == NULL) {
1048                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1049                 return;
1050         }
1051
1052         sk = &llcp_sock->sk;
1053         lock_sock(sk);
1054
1055         nfc_llcp_socket_purge(llcp_sock);
1056
1057         if (sk->sk_state == LLCP_CLOSED) {
1058                 release_sock(sk);
1059                 nfc_llcp_sock_put(llcp_sock);
1060         }
1061
1062         if (sk->sk_state == LLCP_CONNECTED) {
1063                 nfc_put_device(local->dev);
1064                 sk->sk_state = LLCP_CLOSED;
1065                 sk->sk_state_change(sk);
1066         }
1067
1068         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1069
1070         release_sock(sk);
1071         nfc_llcp_sock_put(llcp_sock);
1072 }
1073
1074 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1075 {
1076         struct nfc_llcp_sock *llcp_sock;
1077         struct sock *sk;
1078         u8 dsap, ssap;
1079
1080         dsap = nfc_llcp_dsap(skb);
1081         ssap = nfc_llcp_ssap(skb);
1082
1083         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1084         if (llcp_sock == NULL) {
1085                 pr_err("Invalid CC\n");
1086                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1087
1088                 return;
1089         }
1090
1091         sk = &llcp_sock->sk;
1092
1093         /* Unlink from connecting and link to the client array */
1094         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1095         nfc_llcp_sock_link(&local->sockets, sk);
1096         llcp_sock->dsap = ssap;
1097
1098         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1099                                       skb->len - LLCP_HEADER_SIZE);
1100
1101         sk->sk_state = LLCP_CONNECTED;
1102         sk->sk_state_change(sk);
1103
1104         nfc_llcp_sock_put(llcp_sock);
1105 }
1106
1107 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1108 {
1109         struct nfc_llcp_sock *llcp_sock;
1110         struct sock *sk;
1111         u8 dsap, ssap, reason;
1112
1113         dsap = nfc_llcp_dsap(skb);
1114         ssap = nfc_llcp_ssap(skb);
1115         reason = skb->data[2];
1116
1117         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1118
1119         switch (reason) {
1120         case LLCP_DM_NOBOUND:
1121         case LLCP_DM_REJ:
1122                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1123                 break;
1124
1125         default:
1126                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1127                 break;
1128         }
1129
1130         if (llcp_sock == NULL) {
1131                 pr_debug("Already closed\n");
1132                 return;
1133         }
1134
1135         sk = &llcp_sock->sk;
1136
1137         sk->sk_err = ENXIO;
1138         sk->sk_state = LLCP_CLOSED;
1139         sk->sk_state_change(sk);
1140
1141         nfc_llcp_sock_put(llcp_sock);
1142 }
1143
1144 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1145                               struct sk_buff *skb)
1146 {
1147         struct nfc_llcp_sock *llcp_sock;
1148         u8 dsap, ssap, *tlv, type, length, tid, sap;
1149         u16 tlv_len, offset;
1150         char *service_name;
1151         size_t service_name_len;
1152
1153         dsap = nfc_llcp_dsap(skb);
1154         ssap = nfc_llcp_ssap(skb);
1155
1156         pr_debug("%d %d\n", dsap, ssap);
1157
1158         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1159                 pr_err("Wrong SNL SAP\n");
1160                 return;
1161         }
1162
1163         tlv = &skb->data[LLCP_HEADER_SIZE];
1164         tlv_len = skb->len - LLCP_HEADER_SIZE;
1165         offset = 0;
1166
1167         while (offset < tlv_len) {
1168                 type = tlv[0];
1169                 length = tlv[1];
1170
1171                 switch (type) {
1172                 case LLCP_TLV_SDREQ:
1173                         tid = tlv[2];
1174                         service_name = (char *) &tlv[3];
1175                         service_name_len = length - 1;
1176
1177                         pr_debug("Looking for %.16s\n", service_name);
1178
1179                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1180                             !strncmp(service_name, "urn:nfc:sn:sdp",
1181                                      service_name_len)) {
1182                                 sap = 1;
1183                                 goto send_snl;
1184                         }
1185
1186                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1187                                                           service_name_len);
1188                         if (!llcp_sock) {
1189                                 sap = 0;
1190                                 goto send_snl;
1191                         }
1192
1193                         /*
1194                          * We found a socket but its ssap has not been reserved
1195                          * yet. We need to assign it for good and send a reply.
1196                          * The ssap will be freed when the socket is closed.
1197                          */
1198                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1199                                 atomic_t *client_count;
1200
1201                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1202
1203                                 pr_debug("Reserving %d\n", sap);
1204
1205                                 if (sap == LLCP_SAP_MAX) {
1206                                         sap = 0;
1207                                         goto send_snl;
1208                                 }
1209
1210                                 client_count =
1211                                         &local->local_sdp_cnt[sap -
1212                                                               LLCP_WKS_NUM_SAP];
1213
1214                                 atomic_inc(client_count);
1215
1216                                 llcp_sock->ssap = sap;
1217                                 llcp_sock->reserved_ssap = sap;
1218                         } else {
1219                                 sap = llcp_sock->ssap;
1220                         }
1221
1222                         pr_debug("%p %d\n", llcp_sock, sap);
1223
1224 send_snl:
1225                         nfc_llcp_send_snl(local, tid, sap);
1226                         break;
1227
1228                 default:
1229                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1230                         break;
1231                 }
1232
1233                 offset += length + 2;
1234                 tlv += length + 2;
1235         }
1236 }
1237
1238 static void nfc_llcp_rx_work(struct work_struct *work)
1239 {
1240         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1241                                                     rx_work);
1242         u8 dsap, ssap, ptype;
1243         struct sk_buff *skb;
1244
1245         skb = local->rx_pending;
1246         if (skb == NULL) {
1247                 pr_debug("No pending SKB\n");
1248                 return;
1249         }
1250
1251         ptype = nfc_llcp_ptype(skb);
1252         dsap = nfc_llcp_dsap(skb);
1253         ssap = nfc_llcp_ssap(skb);
1254
1255         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1256
1257         if (ptype != LLCP_PDU_SYMM)
1258                 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1259                                16, 1, skb->data, skb->len, true);
1260
1261         __net_timestamp(skb);
1262
1263         nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1264
1265         switch (ptype) {
1266         case LLCP_PDU_SYMM:
1267                 pr_debug("SYMM\n");
1268                 break;
1269
1270         case LLCP_PDU_UI:
1271                 pr_debug("UI\n");
1272                 nfc_llcp_recv_ui(local, skb);
1273                 break;
1274
1275         case LLCP_PDU_CONNECT:
1276                 pr_debug("CONNECT\n");
1277                 nfc_llcp_recv_connect(local, skb);
1278                 break;
1279
1280         case LLCP_PDU_DISC:
1281                 pr_debug("DISC\n");
1282                 nfc_llcp_recv_disc(local, skb);
1283                 break;
1284
1285         case LLCP_PDU_CC:
1286                 pr_debug("CC\n");
1287                 nfc_llcp_recv_cc(local, skb);
1288                 break;
1289
1290         case LLCP_PDU_DM:
1291                 pr_debug("DM\n");
1292                 nfc_llcp_recv_dm(local, skb);
1293                 break;
1294
1295         case LLCP_PDU_SNL:
1296                 pr_debug("SNL\n");
1297                 nfc_llcp_recv_snl(local, skb);
1298                 break;
1299
1300         case LLCP_PDU_I:
1301         case LLCP_PDU_RR:
1302         case LLCP_PDU_RNR:
1303                 pr_debug("I frame\n");
1304                 nfc_llcp_recv_hdlc(local, skb);
1305                 break;
1306
1307         }
1308
1309         schedule_work(&local->tx_work);
1310         kfree_skb(local->rx_pending);
1311         local->rx_pending = NULL;
1312 }
1313
1314 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1315 {
1316         local->rx_pending = skb;
1317         del_timer(&local->link_timer);
1318         schedule_work(&local->rx_work);
1319 }
1320
1321 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1322 {
1323         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1324
1325         pr_debug("Received an LLCP PDU\n");
1326         if (err < 0) {
1327                 pr_err("err %d\n", err);
1328                 return;
1329         }
1330
1331         __nfc_llcp_recv(local, skb);
1332 }
1333
1334 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1335 {
1336         struct nfc_llcp_local *local;
1337
1338         local = nfc_llcp_find_local(dev);
1339         if (local == NULL)
1340                 return -ENODEV;
1341
1342         __nfc_llcp_recv(local, skb);
1343
1344         return 0;
1345 }
1346
1347 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1348 {
1349         struct nfc_llcp_local *local;
1350
1351         local = nfc_llcp_find_local(dev);
1352         if (local == NULL)
1353                 return;
1354
1355         /* Close and purge all existing sockets */
1356         nfc_llcp_socket_release(local, true);
1357 }
1358
1359 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1360                         u8 comm_mode, u8 rf_mode)
1361 {
1362         struct nfc_llcp_local *local;
1363
1364         pr_debug("rf mode %d\n", rf_mode);
1365
1366         local = nfc_llcp_find_local(dev);
1367         if (local == NULL)
1368                 return;
1369
1370         local->target_idx = target_idx;
1371         local->comm_mode = comm_mode;
1372         local->rf_mode = rf_mode;
1373
1374         if (rf_mode == NFC_RF_INITIATOR) {
1375                 pr_debug("Queueing Tx work\n");
1376
1377                 schedule_work(&local->tx_work);
1378         } else {
1379                 mod_timer(&local->link_timer,
1380                           jiffies + msecs_to_jiffies(local->remote_lto));
1381         }
1382 }
1383
1384 int nfc_llcp_register_device(struct nfc_dev *ndev)
1385 {
1386         struct nfc_llcp_local *local;
1387
1388         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1389         if (local == NULL)
1390                 return -ENOMEM;
1391
1392         local->dev = ndev;
1393         INIT_LIST_HEAD(&local->list);
1394         kref_init(&local->ref);
1395         mutex_init(&local->sdp_lock);
1396         init_timer(&local->link_timer);
1397         local->link_timer.data = (unsigned long) local;
1398         local->link_timer.function = nfc_llcp_symm_timer;
1399
1400         skb_queue_head_init(&local->tx_queue);
1401         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1402
1403         local->rx_pending = NULL;
1404         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1405
1406         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1407
1408         rwlock_init(&local->sockets.lock);
1409         rwlock_init(&local->connecting_sockets.lock);
1410         rwlock_init(&local->raw_sockets.lock);
1411
1412         local->lto = 150; /* 1500 ms */
1413         local->rw = LLCP_MAX_RW;
1414         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1415
1416         nfc_llcp_build_gb(local);
1417
1418         local->remote_miu = LLCP_DEFAULT_MIU;
1419         local->remote_lto = LLCP_DEFAULT_LTO;
1420
1421         list_add(&local->list, &llcp_devices);
1422
1423         return 0;
1424 }
1425
1426 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1427 {
1428         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1429
1430         if (local == NULL) {
1431                 pr_debug("No such device\n");
1432                 return;
1433         }
1434
1435         nfc_llcp_local_put(local);
1436 }
1437
1438 int __init nfc_llcp_init(void)
1439 {
1440         INIT_LIST_HEAD(&llcp_devices);
1441
1442         return nfc_llcp_sock_init();
1443 }
1444
1445 void nfc_llcp_exit(void)
1446 {
1447         nfc_llcp_sock_exit();
1448 }