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                                 sock_orphan(accept_sk);
 112                         }
 113
 114                         if (listen == true) {
 115                                 bh_unlock_sock(sk);
 116                                 continue;
 117                         }
 118                 }
 119
 120                 /*
 121                  * If we have a connection less socket bound, we keep it alive
 122                  * if the device is still present.
 123                  */
 124                 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
 125                     listen == true) {
 126                         bh_unlock_sock(sk);
 127                         continue;
 128                 }
 129
 130                 if (err)
 131                         sk->sk_err = err;
 132                 sk->sk_state = LLCP_CLOSED;
 133                 sk->sk_state_change(sk);
 134
 135                 bh_unlock_sock(sk);
 136
 137                 sock_orphan(sk);
 138
 139                 sk_del_node_init(sk);
 140         }
 141
 142         write_unlock(&local->sockets.lock);
 143
 144         /*
 145          * If we want to keep the listening sockets alive,
 146          * we don't touch the RAW ones.
 147          */
 148         if (listen == true)
 149                 return;
 150
 151         write_lock(&local->raw_sockets.lock);
 152
 153         sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
 154                 llcp_sock = nfc_llcp_sock(sk);
 155
 156                 bh_lock_sock(sk);
 157
 158                 nfc_llcp_socket_purge(llcp_sock);
 159
 160                 if (err)
 161                         sk->sk_err = err;
 162                 sk->sk_state = LLCP_CLOSED;
 163                 sk->sk_state_change(sk);
 164
 165                 bh_unlock_sock(sk);
 166
 167                 sock_orphan(sk);
 168
 169                 sk_del_node_init(sk);
 170         }
 171
 172         write_unlock(&local->raw_sockets.lock);
 173 }
 174
 175 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
 176 {
 177         kref_get(&local->ref);
 178
 179         return local;
 180 }
 181
 182 static void local_cleanup(struct nfc_llcp_local *local, bool listen)
 183 {
 184         nfc_llcp_socket_release(local, listen, ENXIO);
 185         del_timer_sync(&local->link_timer);
 186         skb_queue_purge(&local->tx_queue);
 187         cancel_work_sync(&local->tx_work);
 188         cancel_work_sync(&local->rx_work);
 189         cancel_work_sync(&local->timeout_work);
 190         kfree_skb(local->rx_pending);
 191 }
 192
 193 static void local_release(struct kref *ref)
 194 {
 195         struct nfc_llcp_local *local;
 196
 197         local = container_of(ref, struct nfc_llcp_local, ref);
 198
 199         list_del(&local->list);
 200         local_cleanup(local, false);
 201         kfree(local);
 202 }
 203
 204 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 205 {
 206         if (local == NULL)
 207                 return 0;
 208
 209         return kref_put(&local->ref, local_release);
 210 }
 211
 212 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 213                                                u8 ssap, u8 dsap)
 214 {
 215         struct sock *sk;
 216         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 217
 218         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 219
 220         if (ssap == 0 && dsap == 0)
 221                 return NULL;
 222
 223         read_lock(&local->sockets.lock);
 224
 225         llcp_sock = NULL;
 226
 227         sk_for_each(sk, &local->sockets.head) {
 228                 tmp_sock = nfc_llcp_sock(sk);
 229
 230                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 231                         llcp_sock = tmp_sock;
 232                         break;
 233                 }
 234         }
 235
 236         read_unlock(&local->sockets.lock);
 237
 238         if (llcp_sock == NULL)
 239                 return NULL;
 240
 241         sock_hold(&llcp_sock->sk);
 242
 243         return llcp_sock;
 244 }
 245
 246 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 247 {
 248         sock_put(&sock->sk);
 249 }
 250
 251 static void nfc_llcp_timeout_work(struct work_struct *work)
 252 {
 253         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 254                                                     timeout_work);
 255
 256         nfc_dep_link_down(local->dev);
 257 }
 258
 259 static void nfc_llcp_symm_timer(unsigned long data)
 260 {
 261         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 262
 263         pr_err("SYMM timeout\n");
 264
 265         schedule_work(&local->timeout_work);
 266 }
 267
 268 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 269 {
 270         struct nfc_llcp_local *local, *n;
 271
 272         list_for_each_entry_safe(local, n, &llcp_devices, list)
 273                 if (local->dev == dev)
 274                         return local;
 275
 276         pr_debug("No device found\n");
 277
 278         return NULL;
 279 }
 280
 281 static char *wks[] = {
 282         NULL,
 283         NULL, /* SDP */
 284         "urn:nfc:sn:ip",
 285         "urn:nfc:sn:obex",
 286         "urn:nfc:sn:snep",
 287 };
 288
 289 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
 290 {
 291         int sap, num_wks;
 292
 293         pr_debug("%s\n", service_name);
 294
 295         if (service_name == NULL)
 296                 return -EINVAL;
 297
 298         num_wks = ARRAY_SIZE(wks);
 299
 300         for (sap = 0; sap < num_wks; sap++) {
 301                 if (wks[sap] == NULL)
 302                         continue;
 303
 304                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 305                         return sap;
 306         }
 307
 308         return -EINVAL;
 309 }
 310
 311 static
 312 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 313                                             u8 *sn, size_t sn_len)
 314 {
 315         struct sock *sk;
 316         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 317
 318         pr_debug("sn %zd %p\n", sn_len, sn);
 319
 320         if (sn == NULL || sn_len == 0)
 321                 return NULL;
 322
 323         read_lock(&local->sockets.lock);
 324
 325         llcp_sock = NULL;
 326
 327         sk_for_each(sk, &local->sockets.head) {
 328                 tmp_sock = nfc_llcp_sock(sk);
 329
 330                 pr_debug("llcp sock %p\n", tmp_sock);
 331
 332                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 333                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 334                         continue;
 335
 336                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 337                     tmp_sock->sk.sk_state != LLCP_BOUND)
 338                         continue;
 339
 340                 if (tmp_sock->service_name == NULL ||
 341                     tmp_sock->service_name_len == 0)
 342                         continue;
 343
 344                 if (tmp_sock->service_name_len != sn_len)
 345                         continue;
 346
 347                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 348                         llcp_sock = tmp_sock;
 349                         break;
 350                 }
 351         }
 352
 353         read_unlock(&local->sockets.lock);
 354
 355         pr_debug("Found llcp sock %p\n", llcp_sock);
 356
 357         return llcp_sock;
 358 }
 359
 360 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 361                          struct nfc_llcp_sock *sock)
 362 {
 363         mutex_lock(&local->sdp_lock);
 364
 365         if (sock->service_name != NULL && sock->service_name_len > 0) {
 366                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 367                                             sock->service_name_len);
 368
 369                 if (ssap > 0) {
 370                         pr_debug("WKS %d\n", ssap);
 371
 372                         /* This is a WKS, let's check if it's free */
 373                         if (local->local_wks & BIT(ssap)) {
 374                                 mutex_unlock(&local->sdp_lock);
 375
 376                                 return LLCP_SAP_MAX;
 377                         }
 378
 379                         set_bit(ssap, &local->local_wks);
 380                         mutex_unlock(&local->sdp_lock);
 381
 382                         return ssap;
 383                 }
 384
 385                 /*
 386                  * Check if there already is a non WKS socket bound
 387                  * to this service name.
 388                  */
 389                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 390                                           sock->service_name_len) != NULL) {
 391                         mutex_unlock(&local->sdp_lock);
 392
 393                         return LLCP_SAP_MAX;
 394                 }
 395
 396                 mutex_unlock(&local->sdp_lock);
 397
 398                 return LLCP_SDP_UNBOUND;
 399
 400         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 401                 if (!test_bit(sock->ssap, &local->local_wks)) {
 402                         set_bit(sock->ssap, &local->local_wks);
 403                         mutex_unlock(&local->sdp_lock);
 404
 405                         return sock->ssap;
 406                 }
 407         }
 408
 409         mutex_unlock(&local->sdp_lock);
 410
 411         return LLCP_SAP_MAX;
 412 }
 413
 414 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 415 {
 416         u8 local_ssap;
 417
 418         mutex_lock(&local->sdp_lock);
 419
 420         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 421         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 422                 mutex_unlock(&local->sdp_lock);
 423                 return LLCP_SAP_MAX;
 424         }
 425
 426         set_bit(local_ssap, &local->local_sap);
 427
 428         mutex_unlock(&local->sdp_lock);
 429
 430         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 431 }
 432
 433 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 434 {
 435         u8 local_ssap;
 436         unsigned long *sdp;
 437
 438         if (ssap < LLCP_WKS_NUM_SAP) {
 439                 local_ssap = ssap;
 440                 sdp = &local->local_wks;
 441         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 442                 atomic_t *client_cnt;
 443
 444                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 445                 sdp = &local->local_sdp;
 446                 client_cnt = &local->local_sdp_cnt[local_ssap];
 447
 448                 pr_debug("%d clients\n", atomic_read(client_cnt));
 449
 450                 mutex_lock(&local->sdp_lock);
 451
 452                 if (atomic_dec_and_test(client_cnt)) {
 453                         struct nfc_llcp_sock *l_sock;
 454
 455                         pr_debug("No more clients for SAP %d\n", ssap);
 456
 457                         clear_bit(local_ssap, sdp);
 458
 459                         /* Find the listening sock and set it back to UNBOUND */
 460                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 461                         if (l_sock) {
 462                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 463                                 nfc_llcp_sock_put(l_sock);
 464                         }
 465                 }
 466
 467                 mutex_unlock(&local->sdp_lock);
 468
 469                 return;
 470         } else if (ssap < LLCP_MAX_SAP) {
 471                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 472                 sdp = &local->local_sap;
 473         } else {
 474                 return;
 475         }
 476
 477         mutex_lock(&local->sdp_lock);
 478
 479         clear_bit(local_ssap, sdp);
 480
 481         mutex_unlock(&local->sdp_lock);
 482 }
 483
 484 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 485 {
 486         u8 ssap;
 487
 488         mutex_lock(&local->sdp_lock);
 489
 490         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 491         if (ssap == LLCP_SDP_NUM_SAP) {
 492                 mutex_unlock(&local->sdp_lock);
 493
 494                 return LLCP_SAP_MAX;
 495         }
 496
 497         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 498
 499         set_bit(ssap, &local->local_sdp);
 500
 501         mutex_unlock(&local->sdp_lock);
 502
 503         return LLCP_WKS_NUM_SAP + ssap;
 504 }
 505
 506 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 507 {
 508         u8 *gb_cur, *version_tlv, version, version_length;
 509         u8 *lto_tlv, lto_length;
 510         u8 *wks_tlv, wks_length;
 511         u8 *miux_tlv, miux_length;
 512         u8 gb_len = 0;
 513         int ret = 0;
 514
 515         version = LLCP_VERSION_11;
 516         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 517                                          1, &version_length);
 518         gb_len += version_length;
 519
 520         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 521         gb_len += lto_length;
 522
 523         pr_debug("Local wks 0x%lx\n", local->local_wks);
 524         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
 525                                      &wks_length);
 526         gb_len += wks_length;
 527
 528         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 529                                       &miux_length);
 530         gb_len += miux_length;
 531
 532         gb_len += ARRAY_SIZE(llcp_magic);
 533
 534         if (gb_len > NFC_MAX_GT_LEN) {
 535                 ret = -EINVAL;
 536                 goto out;
 537         }
 538
 539         gb_cur = local->gb;
 540
 541         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 542         gb_cur += ARRAY_SIZE(llcp_magic);
 543
 544         memcpy(gb_cur, version_tlv, version_length);
 545         gb_cur += version_length;
 546
 547         memcpy(gb_cur, lto_tlv, lto_length);
 548         gb_cur += lto_length;
 549
 550         memcpy(gb_cur, wks_tlv, wks_length);
 551         gb_cur += wks_length;
 552
 553         memcpy(gb_cur, miux_tlv, miux_length);
 554         gb_cur += miux_length;
 555
 556         local->gb_len = gb_len;
 557
 558 out:
 559         kfree(version_tlv);
 560         kfree(lto_tlv);
 561         kfree(wks_tlv);
 562         kfree(miux_tlv);
 563
 564         return ret;
 565 }
 566
 567 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 568 {
 569         struct nfc_llcp_local *local;
 570
 571         local = nfc_llcp_find_local(dev);
 572         if (local == NULL) {
 573                 *general_bytes_len = 0;
 574                 return NULL;
 575         }
 576
 577         nfc_llcp_build_gb(local);
 578
 579         *general_bytes_len = local->gb_len;
 580
 581         return local->gb;
 582 }
 583
 584 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 585 {
 586         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
 587
 588         if (local == NULL) {
 589                 pr_err("No LLCP device\n");
 590                 return -ENODEV;
 591         }
 592         if (gb_len < 3)
 593                 return -EINVAL;
 594
 595         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 596         memcpy(local->remote_gb, gb, gb_len);
 597         local->remote_gb_len = gb_len;
 598
 599         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 600                 pr_err("MAC does not support LLCP\n");
 601                 return -EINVAL;
 602         }
 603
 604         return nfc_llcp_parse_gb_tlv(local,
 605                                      &local->remote_gb[3],
 606                                      local->remote_gb_len - 3);
 607 }
 608
 609 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
 610 {
 611         return (pdu->data[0] & 0xfc) >> 2;
 612 }
 613
 614 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
 615 {
 616         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 617 }
 618
 619 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
 620 {
 621         return pdu->data[1] & 0x3f;
 622 }
 623
 624 static u8 nfc_llcp_ns(struct sk_buff *pdu)
 625 {
 626         return pdu->data[2] >> 4;
 627 }
 628
 629 static u8 nfc_llcp_nr(struct sk_buff *pdu)
 630 {
 631         return pdu->data[2] & 0xf;
 632 }
 633
 634 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 635 {
 636         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 637         sock->send_n = (sock->send_n + 1) % 16;
 638         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 639 }
 640
 641 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 642                                struct sk_buff *skb, u8 direction)
 643 {
 644         struct sk_buff *skb_copy = NULL, *nskb;
 645         struct sock *sk;
 646         u8 *data;
 647
 648         read_lock(&local->raw_sockets.lock);
 649
 650         sk_for_each(sk, &local->raw_sockets.head) {
 651                 if (sk->sk_state != LLCP_BOUND)
 652                         continue;
 653
 654                 if (skb_copy == NULL) {
 655                         skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
 656                                                GFP_ATOMIC);
 657
 658                         if (skb_copy == NULL)
 659                                 continue;
 660
 661                         data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
 662
 663                         data[0] = local->dev ? local->dev->idx : 0xFF;
 664                         data[1] = direction;
 665                 }
 666
 667                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 668                 if (!nskb)
 669                         continue;
 670
 671                 if (sock_queue_rcv_skb(sk, nskb))
 672                         kfree_skb(nskb);
 673         }
 674
 675         read_unlock(&local->raw_sockets.lock);
 676
 677         kfree_skb(skb_copy);
 678 }
 679
 680 static void nfc_llcp_tx_work(struct work_struct *work)
 681 {
 682         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 683                                                     tx_work);
 684         struct sk_buff *skb;
 685         struct sock *sk;
 686         struct nfc_llcp_sock *llcp_sock;
 687
 688         skb = skb_dequeue(&local->tx_queue);
 689         if (skb != NULL) {
 690                 sk = skb->sk;
 691                 llcp_sock = nfc_llcp_sock(sk);
 692
 693                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 694                         nfc_llcp_send_symm(local->dev);
 695                 } else {
 696                         struct sk_buff *copy_skb = NULL;
 697                         u8 ptype = nfc_llcp_ptype(skb);
 698                         int ret;
 699
 700                         pr_debug("Sending pending skb\n");
 701                         print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
 702                                        DUMP_PREFIX_OFFSET, 16, 1,
 703                                        skb->data, skb->len, true);
 704
 705                         if (ptype == LLCP_PDU_I)
 706                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 707
 708                         __net_timestamp(skb);
 709
 710                         nfc_llcp_send_to_raw_sock(local, skb,
 711                                                   NFC_LLCP_DIRECTION_TX);
 712
 713                         ret = nfc_data_exchange(local->dev, local->target_idx,
 714                                                 skb, nfc_llcp_recv, local);
 715
 716                         if (ret) {
 717                                 kfree_skb(copy_skb);
 718                                 goto out;
 719                         }
 720
 721                         if (ptype == LLCP_PDU_I && copy_skb)
 722                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 723                                                copy_skb);
 724                 }
 725         } else {
 726                 nfc_llcp_send_symm(local->dev);
 727         }
 728
 729 out:
 730         mod_timer(&local->link_timer,
 731                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 732 }
 733
 734 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 735                                                           u8 ssap)
 736 {
 737         struct sock *sk;
 738         struct nfc_llcp_sock *llcp_sock;
 739
 740         read_lock(&local->connecting_sockets.lock);
 741
 742         sk_for_each(sk, &local->connecting_sockets.head) {
 743                 llcp_sock = nfc_llcp_sock(sk);
 744
 745                 if (llcp_sock->ssap == ssap) {
 746                         sock_hold(&llcp_sock->sk);
 747                         goto out;
 748                 }
 749         }
 750
 751         llcp_sock = NULL;
 752
 753 out:
 754         read_unlock(&local->connecting_sockets.lock);
 755
 756         return llcp_sock;
 757 }
 758
 759 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 760                                                   u8 *sn, size_t sn_len)
 761 {
 762         struct nfc_llcp_sock *llcp_sock;
 763
 764         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 765
 766         if (llcp_sock == NULL)
 767                 return NULL;
 768
 769         sock_hold(&llcp_sock->sk);
 770
 771         return llcp_sock;
 772 }
 773
 774 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
 775 {
 776         u8 *tlv = &skb->data[2], type, length;
 777         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 778
 779         while (offset < tlv_array_len) {
 780                 type = tlv[0];
 781                 length = tlv[1];
 782
 783                 pr_debug("type 0x%x length %d\n", type, length);
 784
 785                 if (type == LLCP_TLV_SN) {
 786                         *sn_len = length;
 787                         return &tlv[2];
 788                 }
 789
 790                 offset += length + 2;
 791                 tlv += length + 2;
 792         }
 793
 794         return NULL;
 795 }
 796
 797 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 798                              struct sk_buff *skb)
 799 {
 800         struct nfc_llcp_sock *llcp_sock;
 801         struct nfc_llcp_ui_cb *ui_cb;
 802         u8 dsap, ssap;
 803
 804         dsap = nfc_llcp_dsap(skb);
 805         ssap = nfc_llcp_ssap(skb);
 806
 807         ui_cb = nfc_llcp_ui_skb_cb(skb);
 808         ui_cb->dsap = dsap;
 809         ui_cb->ssap = ssap;
 810
 811         printk("%s %d %d\n", __func__, dsap, ssap);
 812
 813         pr_debug("%d %d\n", dsap, ssap);
 814
 815         /* We're looking for a bound socket, not a client one */
 816         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 817         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 818                 return;
 819
 820         /* There is no sequence with UI frames */
 821         skb_pull(skb, LLCP_HEADER_SIZE);
 822         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 823                 /*
 824                  * UI frames will be freed from the socket layer, so we
 825                  * need to keep them alive until someone receives them.
 826                  */
 827                 skb_get(skb);
 828         } else {
 829                 pr_err("Receive queue is full\n");
 830                 kfree_skb(skb);
 831         }
 832
 833         nfc_llcp_sock_put(llcp_sock);
 834 }
 835
 836 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 837                                   struct sk_buff *skb)
 838 {
 839         struct sock *new_sk, *parent;
 840         struct nfc_llcp_sock *sock, *new_sock;
 841         u8 dsap, ssap, reason;
 842
 843         dsap = nfc_llcp_dsap(skb);
 844         ssap = nfc_llcp_ssap(skb);
 845
 846         pr_debug("%d %d\n", dsap, ssap);
 847
 848         if (dsap != LLCP_SAP_SDP) {
 849                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 850                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 851                         reason = LLCP_DM_NOBOUND;
 852                         goto fail;
 853                 }
 854         } else {
 855                 u8 *sn;
 856                 size_t sn_len;
 857
 858                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 859                 if (sn == NULL) {
 860                         reason = LLCP_DM_NOBOUND;
 861                         goto fail;
 862                 }
 863
 864                 pr_debug("Service name length %zu\n", sn_len);
 865
 866                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 867                 if (sock == NULL) {
 868                         reason = LLCP_DM_NOBOUND;
 869                         goto fail;
 870                 }
 871         }
 872
 873         lock_sock(&sock->sk);
 874
 875         parent = &sock->sk;
 876
 877         if (sk_acceptq_is_full(parent)) {
 878                 reason = LLCP_DM_REJ;
 879                 release_sock(&sock->sk);
 880                 sock_put(&sock->sk);
 881                 goto fail;
 882         }
 883
 884         if (sock->ssap == LLCP_SDP_UNBOUND) {
 885                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 886
 887                 pr_debug("First client, reserving %d\n", ssap);
 888
 889                 if (ssap == LLCP_SAP_MAX) {
 890                         reason = LLCP_DM_REJ;
 891                         release_sock(&sock->sk);
 892                         sock_put(&sock->sk);
 893                         goto fail;
 894                 }
 895
 896                 sock->ssap = ssap;
 897         }
 898
 899         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
 900         if (new_sk == NULL) {
 901                 reason = LLCP_DM_REJ;
 902                 release_sock(&sock->sk);
 903                 sock_put(&sock->sk);
 904                 goto fail;
 905         }
 906
 907         new_sock = nfc_llcp_sock(new_sk);
 908         new_sock->dev = local->dev;
 909         new_sock->local = nfc_llcp_local_get(local);
 910         new_sock->miu = local->remote_miu;
 911         new_sock->nfc_protocol = sock->nfc_protocol;
 912         new_sock->dsap = ssap;
 913         new_sock->target_idx = local->target_idx;
 914         new_sock->parent = parent;
 915         new_sock->ssap = sock->ssap;
 916         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 917                 atomic_t *client_count;
 918
 919                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 920
 921                 client_count =
 922                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 923
 924                 atomic_inc(client_count);
 925                 new_sock->reserved_ssap = sock->ssap;
 926         }
 927
 928         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 929                                       skb->len - LLCP_HEADER_SIZE);
 930
 931         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 932
 933         nfc_llcp_sock_link(&local->sockets, new_sk);
 934
 935         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 936
 937         nfc_get_device(local->dev->idx);
 938
 939         new_sk->sk_state = LLCP_CONNECTED;
 940
 941         /* Wake the listening processes */
 942         parent->sk_data_ready(parent, 0);
 943
 944         /* Send CC */
 945         nfc_llcp_send_cc(new_sock);
 946
 947         release_sock(&sock->sk);
 948         sock_put(&sock->sk);
 949
 950         return;
 951
 952 fail:
 953         /* Send DM */
 954         nfc_llcp_send_dm(local, dsap, ssap, reason);
 955 }
 956
 957 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
 958 {
 959         int nr_frames = 0;
 960         struct nfc_llcp_local *local = sock->local;
 961
 962         pr_debug("Remote ready %d tx queue len %d remote rw %d",
 963                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
 964                  sock->rw);
 965
 966         /* Try to queue some I frames for transmission */
 967         while (sock->remote_ready &&
 968                skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
 969                 struct sk_buff *pdu;
 970
 971                 pdu = skb_dequeue(&sock->tx_queue);
 972                 if (pdu == NULL)
 973                         break;
 974
 975                 /* Update N(S)/N(R) */
 976                 nfc_llcp_set_nrns(sock, pdu);
 977
 978                 skb_queue_tail(&local->tx_queue, pdu);
 979                 nr_frames++;
 980         }
 981
 982         return nr_frames;
 983 }
 984
 985 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
 986                                struct sk_buff *skb)
 987 {
 988         struct nfc_llcp_sock *llcp_sock;
 989         struct sock *sk;
 990         u8 dsap, ssap, ptype, ns, nr;
 991
 992         ptype = nfc_llcp_ptype(skb);
 993         dsap = nfc_llcp_dsap(skb);
 994         ssap = nfc_llcp_ssap(skb);
 995         ns = nfc_llcp_ns(skb);
 996         nr = nfc_llcp_nr(skb);
 997
 998         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
 999
1000         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1001         if (llcp_sock == NULL) {
1002                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1003                 return;
1004         }
1005
1006         sk = &llcp_sock->sk;
1007         lock_sock(sk);
1008         if (sk->sk_state == LLCP_CLOSED) {
1009                 release_sock(sk);
1010                 nfc_llcp_sock_put(llcp_sock);
1011         }
1012
1013         /* Pass the payload upstream */
1014         if (ptype == LLCP_PDU_I) {
1015                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1016
1017                 if (ns == llcp_sock->recv_n)
1018                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1019                 else
1020                         pr_err("Received out of sequence I PDU\n");
1021
1022                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1023                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1024                         /*
1025                          * I frames will be freed from the socket layer, so we
1026                          * need to keep them alive until someone receives them.
1027                          */
1028                         skb_get(skb);
1029                 } else {
1030                         pr_err("Receive queue is full\n");
1031                         kfree_skb(skb);
1032                 }
1033         }
1034
1035         /* Remove skbs from the pending queue */
1036         if (llcp_sock->send_ack_n != nr) {
1037                 struct sk_buff *s, *tmp;
1038                 u8 n;
1039
1040                 llcp_sock->send_ack_n = nr;
1041
1042                 /* Remove and free all skbs until ns == nr */
1043                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1044                         n = nfc_llcp_ns(s);
1045
1046                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1047                         kfree_skb(s);
1048
1049                         if (n == nr)
1050                                 break;
1051                 }
1052
1053                 /* Re-queue the remaining skbs for transmission */
1054                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1055                                             s, tmp) {
1056                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1057                         skb_queue_head(&local->tx_queue, s);
1058                 }
1059         }
1060
1061         if (ptype == LLCP_PDU_RR)
1062                 llcp_sock->remote_ready = true;
1063         else if (ptype == LLCP_PDU_RNR)
1064                 llcp_sock->remote_ready = false;
1065
1066         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1067                 nfc_llcp_send_rr(llcp_sock);
1068
1069         release_sock(sk);
1070         nfc_llcp_sock_put(llcp_sock);
1071 }
1072
1073 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1074                                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_sock_get(local, dsap, ssap);
1084         if (llcp_sock == NULL) {
1085                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1086                 return;
1087         }
1088
1089         sk = &llcp_sock->sk;
1090         lock_sock(sk);
1091
1092         nfc_llcp_socket_purge(llcp_sock);
1093
1094         if (sk->sk_state == LLCP_CLOSED) {
1095                 release_sock(sk);
1096                 nfc_llcp_sock_put(llcp_sock);
1097         }
1098
1099         if (sk->sk_state == LLCP_CONNECTED) {
1100                 nfc_put_device(local->dev);
1101                 sk->sk_state = LLCP_CLOSED;
1102                 sk->sk_state_change(sk);
1103         }
1104
1105         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1106
1107         release_sock(sk);
1108         nfc_llcp_sock_put(llcp_sock);
1109 }
1110
1111 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1112 {
1113         struct nfc_llcp_sock *llcp_sock;
1114         struct sock *sk;
1115         u8 dsap, ssap;
1116
1117         dsap = nfc_llcp_dsap(skb);
1118         ssap = nfc_llcp_ssap(skb);
1119
1120         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1121         if (llcp_sock == NULL) {
1122                 pr_err("Invalid CC\n");
1123                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1124
1125                 return;
1126         }
1127
1128         sk = &llcp_sock->sk;
1129
1130         /* Unlink from connecting and link to the client array */
1131         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1132         nfc_llcp_sock_link(&local->sockets, sk);
1133         llcp_sock->dsap = ssap;
1134
1135         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1136                                       skb->len - LLCP_HEADER_SIZE);
1137
1138         sk->sk_state = LLCP_CONNECTED;
1139         sk->sk_state_change(sk);
1140
1141         nfc_llcp_sock_put(llcp_sock);
1142 }
1143
1144 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1145 {
1146         struct nfc_llcp_sock *llcp_sock;
1147         struct sock *sk;
1148         u8 dsap, ssap, reason;
1149
1150         dsap = nfc_llcp_dsap(skb);
1151         ssap = nfc_llcp_ssap(skb);
1152         reason = skb->data[2];
1153
1154         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1155
1156         switch (reason) {
1157         case LLCP_DM_NOBOUND:
1158         case LLCP_DM_REJ:
1159                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1160                 break;
1161
1162         default:
1163                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1164                 break;
1165         }
1166
1167         if (llcp_sock == NULL) {
1168                 pr_debug("Already closed\n");
1169                 return;
1170         }
1171
1172         sk = &llcp_sock->sk;
1173
1174         sk->sk_err = ENXIO;
1175         sk->sk_state = LLCP_CLOSED;
1176         sk->sk_state_change(sk);
1177
1178         nfc_llcp_sock_put(llcp_sock);
1179 }
1180
1181 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1182                               struct sk_buff *skb)
1183 {
1184         struct nfc_llcp_sock *llcp_sock;
1185         u8 dsap, ssap, *tlv, type, length, tid, sap;
1186         u16 tlv_len, offset;
1187         char *service_name;
1188         size_t service_name_len;
1189
1190         dsap = nfc_llcp_dsap(skb);
1191         ssap = nfc_llcp_ssap(skb);
1192
1193         pr_debug("%d %d\n", dsap, ssap);
1194
1195         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1196                 pr_err("Wrong SNL SAP\n");
1197                 return;
1198         }
1199
1200         tlv = &skb->data[LLCP_HEADER_SIZE];
1201         tlv_len = skb->len - LLCP_HEADER_SIZE;
1202         offset = 0;
1203
1204         while (offset < tlv_len) {
1205                 type = tlv[0];
1206                 length = tlv[1];
1207
1208                 switch (type) {
1209                 case LLCP_TLV_SDREQ:
1210                         tid = tlv[2];
1211                         service_name = (char *) &tlv[3];
1212                         service_name_len = length - 1;
1213
1214                         pr_debug("Looking for %.16s\n", service_name);
1215
1216                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1217                             !strncmp(service_name, "urn:nfc:sn:sdp",
1218                                      service_name_len)) {
1219                                 sap = 1;
1220                                 goto send_snl;
1221                         }
1222
1223                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1224                                                           service_name_len);
1225                         if (!llcp_sock) {
1226                                 sap = 0;
1227                                 goto send_snl;
1228                         }
1229
1230                         /*
1231                          * We found a socket but its ssap has not been reserved
1232                          * yet. We need to assign it for good and send a reply.
1233                          * The ssap will be freed when the socket is closed.
1234                          */
1235                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1236                                 atomic_t *client_count;
1237
1238                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1239
1240                                 pr_debug("Reserving %d\n", sap);
1241
1242                                 if (sap == LLCP_SAP_MAX) {
1243                                         sap = 0;
1244                                         goto send_snl;
1245                                 }
1246
1247                                 client_count =
1248                                         &local->local_sdp_cnt[sap -
1249                                                               LLCP_WKS_NUM_SAP];
1250
1251                                 atomic_inc(client_count);
1252
1253                                 llcp_sock->ssap = sap;
1254                                 llcp_sock->reserved_ssap = sap;
1255                         } else {
1256                                 sap = llcp_sock->ssap;
1257                         }
1258
1259                         pr_debug("%p %d\n", llcp_sock, sap);
1260
1261 send_snl:
1262                         nfc_llcp_send_snl(local, tid, sap);
1263                         break;
1264
1265                 default:
1266                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1267                         break;
1268                 }
1269
1270                 offset += length + 2;
1271                 tlv += length + 2;
1272         }
1273 }
1274
1275 static void nfc_llcp_rx_work(struct work_struct *work)
1276 {
1277         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1278                                                     rx_work);
1279         u8 dsap, ssap, ptype;
1280         struct sk_buff *skb;
1281
1282         skb = local->rx_pending;
1283         if (skb == NULL) {
1284                 pr_debug("No pending SKB\n");
1285                 return;
1286         }
1287
1288         ptype = nfc_llcp_ptype(skb);
1289         dsap = nfc_llcp_dsap(skb);
1290         ssap = nfc_llcp_ssap(skb);
1291
1292         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1293
1294         if (ptype != LLCP_PDU_SYMM)
1295                 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1296                                16, 1, skb->data, skb->len, true);
1297
1298         __net_timestamp(skb);
1299
1300         nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1301
1302         switch (ptype) {
1303         case LLCP_PDU_SYMM:
1304                 pr_debug("SYMM\n");
1305                 break;
1306
1307         case LLCP_PDU_UI:
1308                 pr_debug("UI\n");
1309                 nfc_llcp_recv_ui(local, skb);
1310                 break;
1311
1312         case LLCP_PDU_CONNECT:
1313                 pr_debug("CONNECT\n");
1314                 nfc_llcp_recv_connect(local, skb);
1315                 break;
1316
1317         case LLCP_PDU_DISC:
1318                 pr_debug("DISC\n");
1319                 nfc_llcp_recv_disc(local, skb);
1320                 break;
1321
1322         case LLCP_PDU_CC:
1323                 pr_debug("CC\n");
1324                 nfc_llcp_recv_cc(local, skb);
1325                 break;
1326
1327         case LLCP_PDU_DM:
1328                 pr_debug("DM\n");
1329                 nfc_llcp_recv_dm(local, skb);
1330                 break;
1331
1332         case LLCP_PDU_SNL:
1333                 pr_debug("SNL\n");
1334                 nfc_llcp_recv_snl(local, skb);
1335                 break;
1336
1337         case LLCP_PDU_I:
1338         case LLCP_PDU_RR:
1339         case LLCP_PDU_RNR:
1340                 pr_debug("I frame\n");
1341                 nfc_llcp_recv_hdlc(local, skb);
1342                 break;
1343
1344         }
1345
1346         schedule_work(&local->tx_work);
1347         kfree_skb(local->rx_pending);
1348         local->rx_pending = NULL;
1349 }
1350
1351 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1352 {
1353         local->rx_pending = skb;
1354         del_timer(&local->link_timer);
1355         schedule_work(&local->rx_work);
1356 }
1357
1358 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1359 {
1360         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1361
1362         pr_debug("Received an LLCP PDU\n");
1363         if (err < 0) {
1364                 pr_err("err %d\n", err);
1365                 return;
1366         }
1367
1368         __nfc_llcp_recv(local, skb);
1369 }
1370
1371 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1372 {
1373         struct nfc_llcp_local *local;
1374
1375         local = nfc_llcp_find_local(dev);
1376         if (local == NULL)
1377                 return -ENODEV;
1378
1379         __nfc_llcp_recv(local, skb);
1380
1381         return 0;
1382 }
1383
1384 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1385 {
1386         struct nfc_llcp_local *local;
1387
1388         local = nfc_llcp_find_local(dev);
1389         if (local == NULL)
1390                 return;
1391
1392         /* Close and purge all existing sockets */
1393         nfc_llcp_socket_release(local, true, 0);
1394 }
1395
1396 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1397                         u8 comm_mode, u8 rf_mode)
1398 {
1399         struct nfc_llcp_local *local;
1400
1401         pr_debug("rf mode %d\n", rf_mode);
1402
1403         local = nfc_llcp_find_local(dev);
1404         if (local == NULL)
1405                 return;
1406
1407         local->target_idx = target_idx;
1408         local->comm_mode = comm_mode;
1409         local->rf_mode = rf_mode;
1410
1411         if (rf_mode == NFC_RF_INITIATOR) {
1412                 pr_debug("Queueing Tx work\n");
1413
1414                 schedule_work(&local->tx_work);
1415         } else {
1416                 mod_timer(&local->link_timer,
1417                           jiffies + msecs_to_jiffies(local->remote_lto));
1418         }
1419 }
1420
1421 int nfc_llcp_register_device(struct nfc_dev *ndev)
1422 {
1423         struct nfc_llcp_local *local;
1424
1425         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1426         if (local == NULL)
1427                 return -ENOMEM;
1428
1429         local->dev = ndev;
1430         INIT_LIST_HEAD(&local->list);
1431         kref_init(&local->ref);
1432         mutex_init(&local->sdp_lock);
1433         init_timer(&local->link_timer);
1434         local->link_timer.data = (unsigned long) local;
1435         local->link_timer.function = nfc_llcp_symm_timer;
1436
1437         skb_queue_head_init(&local->tx_queue);
1438         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1439
1440         local->rx_pending = NULL;
1441         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1442
1443         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1444
1445         rwlock_init(&local->sockets.lock);
1446         rwlock_init(&local->connecting_sockets.lock);
1447         rwlock_init(&local->raw_sockets.lock);
1448
1449         local->lto = 150; /* 1500 ms */
1450         local->rw = LLCP_MAX_RW;
1451         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1452
1453         nfc_llcp_build_gb(local);
1454
1455         local->remote_miu = LLCP_DEFAULT_MIU;
1456         local->remote_lto = LLCP_DEFAULT_LTO;
1457
1458         list_add(&local->list, &llcp_devices);
1459
1460         return 0;
1461 }
1462
1463 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1464 {
1465         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1466
1467         if (local == NULL) {
1468                 pr_debug("No such device\n");
1469                 return;
1470         }
1471
1472         local_cleanup(local, false);
1473
1474         nfc_llcp_local_put(local);
1475 }
1476
1477 int __init nfc_llcp_init(void)
1478 {
1479         INIT_LIST_HEAD(&llcp_devices);
1480
1481         return nfc_llcp_sock_init();
1482 }
1483
1484 void nfc_llcp_exit(void)
1485 {
1486         nfc_llcp_sock_exit();
1487 }