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