net/nfc/llcp/llcp.c

   1 /*
   2  * Copyright (C) 2011  Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the
  16  * Free Software Foundation, Inc.,
  17  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
  21
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/list.h>
  25 #include <linux/nfc.h>
  26
  27 #include "../nfc.h"
  28 #include "llcp.h"
  29
  30 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
  31
  32 static struct list_head llcp_devices;
  33
  34 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
  35 {
  36         write_lock(&l->lock);
  37         sk_add_node(sk, &l->head);
  38         write_unlock(&l->lock);
  39 }
  40
  41 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
  42 {
  43         write_lock(&l->lock);
  44         sk_del_node_init(sk);
  45         write_unlock(&l->lock);
  46 }
  47
  48 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
  49 {
  50         struct nfc_llcp_local *local = sock->local;
  51         struct sk_buff *s, *tmp;
  52
  53         pr_debug("%p\n", &sock->sk);
  54
  55         skb_queue_purge(&sock->tx_queue);
  56         skb_queue_purge(&sock->tx_pending_queue);
  57
  58         if (local == NULL)
  59                 return;
  60
  61         /* Search for local pending SKBs that are related to this socket */
  62         skb_queue_walk_safe(&local->tx_queue, s, tmp) {
  63                 if (s->sk != &sock->sk)
  64                         continue;
  65
  66                 skb_unlink(s, &local->tx_queue);
  67                 kfree_skb(s);
  68         }
  69 }
  70
  71 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen)
  72 {
  73         struct sock *sk;
  74         struct hlist_node *tmp;
  75         struct nfc_llcp_sock *llcp_sock;
  76
  77         skb_queue_purge(&local->tx_queue);
  78
  79         write_lock(&local->sockets.lock);
  80
  81         sk_for_each_safe(sk, tmp, &local->sockets.head) {
  82                 llcp_sock = nfc_llcp_sock(sk);
  83
  84                 bh_lock_sock(sk);
  85
  86                 nfc_llcp_socket_purge(llcp_sock);
  87
  88                 if (sk->sk_state == LLCP_CONNECTED)
  89                         nfc_put_device(llcp_sock->dev);
  90
  91                 if (sk->sk_state == LLCP_LISTEN) {
  92                         struct nfc_llcp_sock *lsk, *n;
  93                         struct sock *accept_sk;
  94
  95                         list_for_each_entry_safe(lsk, n,
  96                                                  &llcp_sock->accept_queue,
  97                                                  accept_queue) {
  98                                 accept_sk = &lsk->sk;
  99                                 bh_lock_sock(accept_sk);
 100
 101                                 nfc_llcp_accept_unlink(accept_sk);
 102
 103                                 accept_sk->sk_state = LLCP_CLOSED;
 104
 105                                 bh_unlock_sock(accept_sk);
 106
 107                                 sock_orphan(accept_sk);
 108                         }
 109
 110                         if (listen == true) {
 111                                 bh_unlock_sock(sk);
 112                                 continue;
 113                         }
 114                 }
 115
 116                 /*
 117                  * If we have a connection less socket bound, we keep it alive
 118                  * if the device is still present.
 119                  */
 120                 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
 121                     listen == true) {
 122                         bh_unlock_sock(sk);
 123                         continue;
 124                 }
 125
 126                 sk->sk_state = LLCP_CLOSED;
 127
 128                 bh_unlock_sock(sk);
 129
 130                 sock_orphan(sk);
 131
 132                 sk_del_node_init(sk);
 133         }
 134
 135         write_unlock(&local->sockets.lock);
 136 }
 137
 138 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
 139 {
 140         kref_get(&local->ref);
 141
 142         return local;
 143 }
 144
 145 static void local_cleanup(struct nfc_llcp_local *local, bool listen)
 146 {
 147         nfc_llcp_socket_release(local, listen);
 148         del_timer_sync(&local->link_timer);
 149         skb_queue_purge(&local->tx_queue);
 150         cancel_work_sync(&local->tx_work);
 151         cancel_work_sync(&local->rx_work);
 152         cancel_work_sync(&local->timeout_work);
 153         kfree_skb(local->rx_pending);
 154 }
 155
 156 static void local_release(struct kref *ref)
 157 {
 158         struct nfc_llcp_local *local;
 159
 160         local = container_of(ref, struct nfc_llcp_local, ref);
 161
 162         list_del(&local->list);
 163         local_cleanup(local, false);
 164         kfree(local);
 165 }
 166
 167 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 168 {
 169         if (local == NULL)
 170                 return 0;
 171
 172         return kref_put(&local->ref, local_release);
 173 }
 174
 175 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 176                                                u8 ssap, u8 dsap)
 177 {
 178         struct sock *sk;
 179         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 180
 181         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 182
 183         if (ssap == 0 && dsap == 0)
 184                 return NULL;
 185
 186         read_lock(&local->sockets.lock);
 187
 188         llcp_sock = NULL;
 189
 190         sk_for_each(sk, &local->sockets.head) {
 191                 tmp_sock = nfc_llcp_sock(sk);
 192
 193                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 194                         llcp_sock = tmp_sock;
 195                         break;
 196                 }
 197         }
 198
 199         read_unlock(&local->sockets.lock);
 200
 201         if (llcp_sock == NULL)
 202                 return NULL;
 203
 204         sock_hold(&llcp_sock->sk);
 205
 206         return llcp_sock;
 207 }
 208
 209 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 210 {
 211         sock_put(&sock->sk);
 212 }
 213
 214 static void nfc_llcp_timeout_work(struct work_struct *work)
 215 {
 216         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 217                                                     timeout_work);
 218
 219         nfc_dep_link_down(local->dev);
 220 }
 221
 222 static void nfc_llcp_symm_timer(unsigned long data)
 223 {
 224         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 225
 226         pr_err("SYMM timeout\n");
 227
 228         schedule_work(&local->timeout_work);
 229 }
 230
 231 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 232 {
 233         struct nfc_llcp_local *local, *n;
 234
 235         list_for_each_entry_safe(local, n, &llcp_devices, list)
 236                 if (local->dev == dev)
 237                         return local;
 238
 239         pr_debug("No device found\n");
 240
 241         return NULL;
 242 }
 243
 244 static char *wks[] = {
 245         NULL,
 246         NULL, /* SDP */
 247         "urn:nfc:sn:ip",
 248         "urn:nfc:sn:obex",
 249         "urn:nfc:sn:snep",
 250 };
 251
 252 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
 253 {
 254         int sap, num_wks;
 255
 256         pr_debug("%s\n", service_name);
 257
 258         if (service_name == NULL)
 259                 return -EINVAL;
 260
 261         num_wks = ARRAY_SIZE(wks);
 262
 263         for (sap = 0; sap < num_wks; sap++) {
 264                 if (wks[sap] == NULL)
 265                         continue;
 266
 267                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 268                         return sap;
 269         }
 270
 271         return -EINVAL;
 272 }
 273
 274 static
 275 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 276                                             u8 *sn, size_t sn_len)
 277 {
 278         struct sock *sk;
 279         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 280
 281         pr_debug("sn %zd %p\n", sn_len, sn);
 282
 283         if (sn == NULL || sn_len == 0)
 284                 return NULL;
 285
 286         read_lock(&local->sockets.lock);
 287
 288         llcp_sock = NULL;
 289
 290         sk_for_each(sk, &local->sockets.head) {
 291                 tmp_sock = nfc_llcp_sock(sk);
 292
 293                 pr_debug("llcp sock %p\n", tmp_sock);
 294
 295                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 296                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 297                         continue;
 298
 299                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 300                     tmp_sock->sk.sk_state != LLCP_BOUND)
 301                         continue;
 302
 303                 if (tmp_sock->service_name == NULL ||
 304                     tmp_sock->service_name_len == 0)
 305                         continue;
 306
 307                 if (tmp_sock->service_name_len != sn_len)
 308                         continue;
 309
 310                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 311                         llcp_sock = tmp_sock;
 312                         break;
 313                 }
 314         }
 315
 316         read_unlock(&local->sockets.lock);
 317
 318         pr_debug("Found llcp sock %p\n", llcp_sock);
 319
 320         return llcp_sock;
 321 }
 322
 323 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 324                          struct nfc_llcp_sock *sock)
 325 {
 326         mutex_lock(&local->sdp_lock);
 327
 328         if (sock->service_name != NULL && sock->service_name_len > 0) {
 329                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 330                                             sock->service_name_len);
 331
 332                 if (ssap > 0) {
 333                         pr_debug("WKS %d\n", ssap);
 334
 335                         /* This is a WKS, let's check if it's free */
 336                         if (local->local_wks & BIT(ssap)) {
 337                                 mutex_unlock(&local->sdp_lock);
 338
 339                                 return LLCP_SAP_MAX;
 340                         }
 341
 342                         set_bit(ssap, &local->local_wks);
 343                         mutex_unlock(&local->sdp_lock);
 344
 345                         return ssap;
 346                 }
 347
 348                 /*
 349                  * Check if there already is a non WKS socket bound
 350                  * to this service name.
 351                  */
 352                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 353                                           sock->service_name_len) != NULL) {
 354                         mutex_unlock(&local->sdp_lock);
 355
 356                         return LLCP_SAP_MAX;
 357                 }
 358
 359                 mutex_unlock(&local->sdp_lock);
 360
 361                 return LLCP_SDP_UNBOUND;
 362
 363         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 364                 if (!test_bit(sock->ssap, &local->local_wks)) {
 365                         set_bit(sock->ssap, &local->local_wks);
 366                         mutex_unlock(&local->sdp_lock);
 367
 368                         return sock->ssap;
 369                 }
 370         }
 371
 372         mutex_unlock(&local->sdp_lock);
 373
 374         return LLCP_SAP_MAX;
 375 }
 376
 377 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 378 {
 379         u8 local_ssap;
 380
 381         mutex_lock(&local->sdp_lock);
 382
 383         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 384         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 385                 mutex_unlock(&local->sdp_lock);
 386                 return LLCP_SAP_MAX;
 387         }
 388
 389         set_bit(local_ssap, &local->local_sap);
 390
 391         mutex_unlock(&local->sdp_lock);
 392
 393         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 394 }
 395
 396 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 397 {
 398         u8 local_ssap;
 399         unsigned long *sdp;
 400
 401         if (ssap < LLCP_WKS_NUM_SAP) {
 402                 local_ssap = ssap;
 403                 sdp = &local->local_wks;
 404         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 405                 atomic_t *client_cnt;
 406
 407                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 408                 sdp = &local->local_sdp;
 409                 client_cnt = &local->local_sdp_cnt[local_ssap];
 410
 411                 pr_debug("%d clients\n", atomic_read(client_cnt));
 412
 413                 mutex_lock(&local->sdp_lock);
 414
 415                 if (atomic_dec_and_test(client_cnt)) {
 416                         struct nfc_llcp_sock *l_sock;
 417
 418                         pr_debug("No more clients for SAP %d\n", ssap);
 419
 420                         clear_bit(local_ssap, sdp);
 421
 422                         /* Find the listening sock and set it back to UNBOUND */
 423                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 424                         if (l_sock) {
 425                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 426                                 nfc_llcp_sock_put(l_sock);
 427                         }
 428                 }
 429
 430                 mutex_unlock(&local->sdp_lock);
 431
 432                 return;
 433         } else if (ssap < LLCP_MAX_SAP) {
 434                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 435                 sdp = &local->local_sap;
 436         } else {
 437                 return;
 438         }
 439
 440         mutex_lock(&local->sdp_lock);
 441
 442         clear_bit(local_ssap, sdp);
 443
 444         mutex_unlock(&local->sdp_lock);
 445 }
 446
 447 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 448 {
 449         u8 ssap;
 450
 451         mutex_lock(&local->sdp_lock);
 452
 453         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 454         if (ssap == LLCP_SDP_NUM_SAP) {
 455                 mutex_unlock(&local->sdp_lock);
 456
 457                 return LLCP_SAP_MAX;
 458         }
 459
 460         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 461
 462         set_bit(ssap, &local->local_sdp);
 463
 464         mutex_unlock(&local->sdp_lock);
 465
 466         return LLCP_WKS_NUM_SAP + ssap;
 467 }
 468
 469 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 470 {
 471         u8 *gb_cur, *version_tlv, version, version_length;
 472         u8 *lto_tlv, lto_length;
 473         u8 *wks_tlv, wks_length;
 474         u8 *miux_tlv, miux_length;
 475         u8 gb_len = 0;
 476         int ret = 0;
 477
 478         version = LLCP_VERSION_11;
 479         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 480                                          1, &version_length);
 481         gb_len += version_length;
 482
 483         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 484         gb_len += lto_length;
 485
 486         pr_debug("Local wks 0x%lx\n", local->local_wks);
 487         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
 488                                      &wks_length);
 489         gb_len += wks_length;
 490
 491         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 492                                       &miux_length);
 493         gb_len += miux_length;
 494
 495         gb_len += ARRAY_SIZE(llcp_magic);
 496
 497         if (gb_len > NFC_MAX_GT_LEN) {
 498                 ret = -EINVAL;
 499                 goto out;
 500         }
 501
 502         gb_cur = local->gb;
 503
 504         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 505         gb_cur += ARRAY_SIZE(llcp_magic);
 506
 507         memcpy(gb_cur, version_tlv, version_length);
 508         gb_cur += version_length;
 509
 510         memcpy(gb_cur, lto_tlv, lto_length);
 511         gb_cur += lto_length;
 512
 513         memcpy(gb_cur, wks_tlv, wks_length);
 514         gb_cur += wks_length;
 515
 516         memcpy(gb_cur, miux_tlv, miux_length);
 517         gb_cur += miux_length;
 518
 519         local->gb_len = gb_len;
 520
 521 out:
 522         kfree(version_tlv);
 523         kfree(lto_tlv);
 524         kfree(wks_tlv);
 525         kfree(miux_tlv);
 526
 527         return ret;
 528 }
 529
 530 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 531 {
 532         struct nfc_llcp_local *local;
 533
 534         local = nfc_llcp_find_local(dev);
 535         if (local == NULL) {
 536                 *general_bytes_len = 0;
 537                 return NULL;
 538         }
 539
 540         nfc_llcp_build_gb(local);
 541
 542         *general_bytes_len = local->gb_len;
 543
 544         return local->gb;
 545 }
 546
 547 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 548 {
 549         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
 550
 551         if (local == NULL) {
 552                 pr_err("No LLCP device\n");
 553                 return -ENODEV;
 554         }
 555         if (gb_len < 3)
 556                 return -EINVAL;
 557
 558         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 559         memcpy(local->remote_gb, gb, gb_len);
 560         local->remote_gb_len = gb_len;
 561
 562         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 563                 pr_err("MAC does not support LLCP\n");
 564                 return -EINVAL;
 565         }
 566
 567         return nfc_llcp_parse_gb_tlv(local,
 568                                      &local->remote_gb[3],
 569                                      local->remote_gb_len - 3);
 570 }
 571
 572 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
 573 {
 574         return (pdu->data[0] & 0xfc) >> 2;
 575 }
 576
 577 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
 578 {
 579         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 580 }
 581
 582 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
 583 {
 584         return pdu->data[1] & 0x3f;
 585 }
 586
 587 static u8 nfc_llcp_ns(struct sk_buff *pdu)
 588 {
 589         return pdu->data[2] >> 4;
 590 }
 591
 592 static u8 nfc_llcp_nr(struct sk_buff *pdu)
 593 {
 594         return pdu->data[2] & 0xf;
 595 }
 596
 597 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 598 {
 599         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 600         sock->send_n = (sock->send_n + 1) % 16;
 601         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 602 }
 603
 604 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 605                                struct sk_buff *skb, u8 direction)
 606 {
 607         struct sk_buff *skb_copy = NULL, *nskb;
 608         struct sock *sk;
 609         u8 *data;
 610
 611         read_lock(&local->raw_sockets.lock);
 612
 613         sk_for_each(sk, &local->raw_sockets.head) {
 614                 if (sk->sk_state != LLCP_BOUND)
 615                         continue;
 616
 617                 if (skb_copy == NULL) {
 618                         skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
 619                                                GFP_ATOMIC);
 620
 621                         if (skb_copy == NULL)
 622                                 continue;
 623
 624                         data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
 625
 626                         data[0] = local->dev ? local->dev->idx : 0xFF;
 627                         data[1] = direction;
 628                 }
 629
 630                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 631                 if (!nskb)
 632                         continue;
 633
 634                 if (sock_queue_rcv_skb(sk, nskb))
 635                         kfree_skb(nskb);
 636         }
 637
 638         read_unlock(&local->raw_sockets.lock);
 639
 640         kfree_skb(skb_copy);
 641 }
 642
 643 static void nfc_llcp_tx_work(struct work_struct *work)
 644 {
 645         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 646                                                     tx_work);
 647         struct sk_buff *skb;
 648         struct sock *sk;
 649         struct nfc_llcp_sock *llcp_sock;
 650
 651         skb = skb_dequeue(&local->tx_queue);
 652         if (skb != NULL) {
 653                 sk = skb->sk;
 654                 llcp_sock = nfc_llcp_sock(sk);
 655
 656                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 657                         nfc_llcp_send_symm(local->dev);
 658                 } else {
 659                         struct sk_buff *copy_skb = NULL;
 660                         u8 ptype = nfc_llcp_ptype(skb);
 661                         int ret;
 662
 663                         pr_debug("Sending pending skb\n");
 664                         print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
 665                                        DUMP_PREFIX_OFFSET, 16, 1,
 666                                        skb->data, skb->len, true);
 667
 668                         if (ptype == LLCP_PDU_I)
 669                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 670
 671                         __net_timestamp(skb);
 672
 673                         nfc_llcp_send_to_raw_sock(local, skb,
 674                                                   NFC_LLCP_DIRECTION_TX);
 675
 676                         ret = nfc_data_exchange(local->dev, local->target_idx,
 677                                                 skb, nfc_llcp_recv, local);
 678
 679                         if (ret) {
 680                                 kfree_skb(copy_skb);
 681                                 goto out;
 682                         }
 683
 684                         if (ptype == LLCP_PDU_I && copy_skb)
 685                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 686                                                copy_skb);
 687                 }
 688         } else {
 689                 nfc_llcp_send_symm(local->dev);
 690         }
 691
 692 out:
 693         mod_timer(&local->link_timer,
 694                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 695 }
 696
 697 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 698                                                           u8 ssap)
 699 {
 700         struct sock *sk;
 701         struct nfc_llcp_sock *llcp_sock;
 702
 703         read_lock(&local->connecting_sockets.lock);
 704
 705         sk_for_each(sk, &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         local_cleanup(local, false);
1436
1437         nfc_llcp_local_put(local);
1438 }
1439
1440 int __init nfc_llcp_init(void)
1441 {
1442         INIT_LIST_HEAD(&llcp_devices);
1443
1444         return nfc_llcp_sock_init();
1445 }
1446
1447 void nfc_llcp_exit(void)
1448 {
1449         nfc_llcp_sock_exit();
1450 }