net/nfc/llcp/llcp.c

   1 /*
   2  * Copyright (C) 2011  Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the
  16  * Free Software Foundation, Inc.,
  17  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
  21
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/list.h>
  25 #include <linux/nfc.h>
  26
  27 #include "../nfc.h"
  28 #include "llcp.h"
  29
  30 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
  31
  32 static struct list_head llcp_devices;
  33
  34 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
  35 {
  36         write_lock(&l->lock);
  37         sk_add_node(sk, &l->head);
  38         write_unlock(&l->lock);
  39 }
  40
  41 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
  42 {
  43         write_lock(&l->lock);
  44         sk_del_node_init(sk);
  45         write_unlock(&l->lock);
  46 }
  47
  48 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
  49 {
  50         struct nfc_llcp_local *local = sock->local;
  51         struct sk_buff *s, *tmp;
  52
  53         pr_debug("%p\n", &sock->sk);
  54
  55         skb_queue_purge(&sock->tx_queue);
  56         skb_queue_purge(&sock->tx_pending_queue);
  57
  58         if (local == NULL)
  59                 return;
  60
  61         /* Search for local pending SKBs that are related to this socket */
  62         skb_queue_walk_safe(&local->tx_queue, s, tmp) {
  63                 if (s->sk != &sock->sk)
  64                         continue;
  65
  66                 skb_unlink(s, &local->tx_queue);
  67                 kfree_skb(s);
  68         }
  69 }
  70
  71 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen,
  72                                     int err)
  73 {
  74         struct sock *sk;
  75         struct hlist_node *tmp;
  76         struct nfc_llcp_sock *llcp_sock;
  77
  78         skb_queue_purge(&local->tx_queue);
  79
  80         write_lock(&local->sockets.lock);
  81
  82         sk_for_each_safe(sk, tmp, &local->sockets.head) {
  83                 llcp_sock = nfc_llcp_sock(sk);
  84
  85                 bh_lock_sock(sk);
  86
  87                 nfc_llcp_socket_purge(llcp_sock);
  88
  89                 if (sk->sk_state == LLCP_CONNECTED)
  90                         nfc_put_device(llcp_sock->dev);
  91
  92                 if (sk->sk_state == LLCP_LISTEN) {
  93                         struct nfc_llcp_sock *lsk, *n;
  94                         struct sock *accept_sk;
  95
  96                         list_for_each_entry_safe(lsk, n,
  97                                                  &llcp_sock->accept_queue,
  98                                                  accept_queue) {
  99                                 accept_sk = &lsk->sk;
 100                                 bh_lock_sock(accept_sk);
 101
 102                                 nfc_llcp_accept_unlink(accept_sk);
 103
 104                                 if (err)
 105                                         accept_sk->sk_err = err;
 106                                 accept_sk->sk_state = LLCP_CLOSED;
 107                                 accept_sk->sk_state_change(sk);
 108
 109                                 bh_unlock_sock(accept_sk);
 110                         }
 111
 112                         if (listen == true) {
 113                                 bh_unlock_sock(sk);
 114                                 continue;
 115                         }
 116                 }
 117
 118                 /*
 119                  * If we have a connection less socket bound, we keep it alive
 120                  * if the device is still present.
 121                  */
 122                 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
 123                     listen == true) {
 124                         bh_unlock_sock(sk);
 125                         continue;
 126                 }
 127
 128                 if (err)
 129                         sk->sk_err = err;
 130                 sk->sk_state = LLCP_CLOSED;
 131                 sk->sk_state_change(sk);
 132
 133                 bh_unlock_sock(sk);
 134
 135                 sk_del_node_init(sk);
 136         }
 137
 138         write_unlock(&local->sockets.lock);
 139
 140         /*
 141          * If we want to keep the listening sockets alive,
 142          * we don't touch the RAW ones.
 143          */
 144         if (listen == true)
 145                 return;
 146
 147         write_lock(&local->raw_sockets.lock);
 148
 149         sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
 150                 llcp_sock = nfc_llcp_sock(sk);
 151
 152                 bh_lock_sock(sk);
 153
 154                 nfc_llcp_socket_purge(llcp_sock);
 155
 156                 if (err)
 157                         sk->sk_err = err;
 158                 sk->sk_state = LLCP_CLOSED;
 159                 sk->sk_state_change(sk);
 160
 161                 bh_unlock_sock(sk);
 162
 163                 sk_del_node_init(sk);
 164         }
 165
 166         write_unlock(&local->raw_sockets.lock);
 167 }
 168
 169 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
 170 {
 171         kref_get(&local->ref);
 172
 173         return local;
 174 }
 175
 176 static void local_cleanup(struct nfc_llcp_local *local, bool listen)
 177 {
 178         nfc_llcp_socket_release(local, listen, ENXIO);
 179         del_timer_sync(&local->link_timer);
 180         skb_queue_purge(&local->tx_queue);
 181         cancel_work_sync(&local->tx_work);
 182         cancel_work_sync(&local->rx_work);
 183         cancel_work_sync(&local->timeout_work);
 184         kfree_skb(local->rx_pending);
 185         del_timer_sync(&local->sdreq_timer);
 186         cancel_work_sync(&local->sdreq_timeout_work);
 187         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
 188 }
 189
 190 static void local_release(struct kref *ref)
 191 {
 192         struct nfc_llcp_local *local;
 193
 194         local = container_of(ref, struct nfc_llcp_local, ref);
 195
 196         list_del(&local->list);
 197         local_cleanup(local, false);
 198         kfree(local);
 199 }
 200
 201 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 202 {
 203         if (local == NULL)
 204                 return 0;
 205
 206         return kref_put(&local->ref, local_release);
 207 }
 208
 209 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 210                                                u8 ssap, u8 dsap)
 211 {
 212         struct sock *sk;
 213         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 214
 215         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 216
 217         if (ssap == 0 && dsap == 0)
 218                 return NULL;
 219
 220         read_lock(&local->sockets.lock);
 221
 222         llcp_sock = NULL;
 223
 224         sk_for_each(sk, &local->sockets.head) {
 225                 tmp_sock = nfc_llcp_sock(sk);
 226
 227                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 228                         llcp_sock = tmp_sock;
 229                         break;
 230                 }
 231         }
 232
 233         read_unlock(&local->sockets.lock);
 234
 235         if (llcp_sock == NULL)
 236                 return NULL;
 237
 238         sock_hold(&llcp_sock->sk);
 239
 240         return llcp_sock;
 241 }
 242
 243 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 244 {
 245         sock_put(&sock->sk);
 246 }
 247
 248 static void nfc_llcp_timeout_work(struct work_struct *work)
 249 {
 250         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 251                                                     timeout_work);
 252
 253         nfc_dep_link_down(local->dev);
 254 }
 255
 256 static void nfc_llcp_symm_timer(unsigned long data)
 257 {
 258         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 259
 260         pr_err("SYMM timeout\n");
 261
 262         schedule_work(&local->timeout_work);
 263 }
 264
 265 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
 266 {
 267         unsigned long time;
 268         HLIST_HEAD(nl_sdres_list);
 269         struct hlist_node *n;
 270         struct nfc_llcp_sdp_tlv *sdp;
 271         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 272                                                     sdreq_timeout_work);
 273
 274         mutex_lock(&local->sdreq_lock);
 275
 276         time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
 277
 278         hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
 279                 if (time_after(sdp->time, time))
 280                         continue;
 281
 282                 sdp->sap = LLCP_SDP_UNBOUND;
 283
 284                 hlist_del(&sdp->node);
 285
 286                 hlist_add_head(&sdp->node, &nl_sdres_list);
 287         }
 288
 289         if (!hlist_empty(&local->pending_sdreqs))
 290                 mod_timer(&local->sdreq_timer,
 291                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
 292
 293         mutex_unlock(&local->sdreq_lock);
 294
 295         if (!hlist_empty(&nl_sdres_list))
 296                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
 297 }
 298
 299 static void nfc_llcp_sdreq_timer(unsigned long data)
 300 {
 301         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 302
 303         schedule_work(&local->sdreq_timeout_work);
 304 }
 305
 306 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 307 {
 308         struct nfc_llcp_local *local, *n;
 309
 310         list_for_each_entry_safe(local, n, &llcp_devices, list)
 311                 if (local->dev == dev)
 312                         return local;
 313
 314         pr_debug("No device found\n");
 315
 316         return NULL;
 317 }
 318
 319 static char *wks[] = {
 320         NULL,
 321         NULL, /* SDP */
 322         "urn:nfc:sn:ip",
 323         "urn:nfc:sn:obex",
 324         "urn:nfc:sn:snep",
 325 };
 326
 327 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
 328 {
 329         int sap, num_wks;
 330
 331         pr_debug("%s\n", service_name);
 332
 333         if (service_name == NULL)
 334                 return -EINVAL;
 335
 336         num_wks = ARRAY_SIZE(wks);
 337
 338         for (sap = 0; sap < num_wks; sap++) {
 339                 if (wks[sap] == NULL)
 340                         continue;
 341
 342                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 343                         return sap;
 344         }
 345
 346         return -EINVAL;
 347 }
 348
 349 static
 350 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 351                                             u8 *sn, size_t sn_len)
 352 {
 353         struct sock *sk;
 354         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 355
 356         pr_debug("sn %zd %p\n", sn_len, sn);
 357
 358         if (sn == NULL || sn_len == 0)
 359                 return NULL;
 360
 361         read_lock(&local->sockets.lock);
 362
 363         llcp_sock = NULL;
 364
 365         sk_for_each(sk, &local->sockets.head) {
 366                 tmp_sock = nfc_llcp_sock(sk);
 367
 368                 pr_debug("llcp sock %p\n", tmp_sock);
 369
 370                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 371                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 372                         continue;
 373
 374                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 375                     tmp_sock->sk.sk_state != LLCP_BOUND)
 376                         continue;
 377
 378                 if (tmp_sock->service_name == NULL ||
 379                     tmp_sock->service_name_len == 0)
 380                         continue;
 381
 382                 if (tmp_sock->service_name_len != sn_len)
 383                         continue;
 384
 385                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 386                         llcp_sock = tmp_sock;
 387                         break;
 388                 }
 389         }
 390
 391         read_unlock(&local->sockets.lock);
 392
 393         pr_debug("Found llcp sock %p\n", llcp_sock);
 394
 395         return llcp_sock;
 396 }
 397
 398 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 399                          struct nfc_llcp_sock *sock)
 400 {
 401         mutex_lock(&local->sdp_lock);
 402
 403         if (sock->service_name != NULL && sock->service_name_len > 0) {
 404                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 405                                             sock->service_name_len);
 406
 407                 if (ssap > 0) {
 408                         pr_debug("WKS %d\n", ssap);
 409
 410                         /* This is a WKS, let's check if it's free */
 411                         if (local->local_wks & BIT(ssap)) {
 412                                 mutex_unlock(&local->sdp_lock);
 413
 414                                 return LLCP_SAP_MAX;
 415                         }
 416
 417                         set_bit(ssap, &local->local_wks);
 418                         mutex_unlock(&local->sdp_lock);
 419
 420                         return ssap;
 421                 }
 422
 423                 /*
 424                  * Check if there already is a non WKS socket bound
 425                  * to this service name.
 426                  */
 427                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 428                                           sock->service_name_len) != NULL) {
 429                         mutex_unlock(&local->sdp_lock);
 430
 431                         return LLCP_SAP_MAX;
 432                 }
 433
 434                 mutex_unlock(&local->sdp_lock);
 435
 436                 return LLCP_SDP_UNBOUND;
 437
 438         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 439                 if (!test_bit(sock->ssap, &local->local_wks)) {
 440                         set_bit(sock->ssap, &local->local_wks);
 441                         mutex_unlock(&local->sdp_lock);
 442
 443                         return sock->ssap;
 444                 }
 445         }
 446
 447         mutex_unlock(&local->sdp_lock);
 448
 449         return LLCP_SAP_MAX;
 450 }
 451
 452 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 453 {
 454         u8 local_ssap;
 455
 456         mutex_lock(&local->sdp_lock);
 457
 458         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 459         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 460                 mutex_unlock(&local->sdp_lock);
 461                 return LLCP_SAP_MAX;
 462         }
 463
 464         set_bit(local_ssap, &local->local_sap);
 465
 466         mutex_unlock(&local->sdp_lock);
 467
 468         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 469 }
 470
 471 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 472 {
 473         u8 local_ssap;
 474         unsigned long *sdp;
 475
 476         if (ssap < LLCP_WKS_NUM_SAP) {
 477                 local_ssap = ssap;
 478                 sdp = &local->local_wks;
 479         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 480                 atomic_t *client_cnt;
 481
 482                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 483                 sdp = &local->local_sdp;
 484                 client_cnt = &local->local_sdp_cnt[local_ssap];
 485
 486                 pr_debug("%d clients\n", atomic_read(client_cnt));
 487
 488                 mutex_lock(&local->sdp_lock);
 489
 490                 if (atomic_dec_and_test(client_cnt)) {
 491                         struct nfc_llcp_sock *l_sock;
 492
 493                         pr_debug("No more clients for SAP %d\n", ssap);
 494
 495                         clear_bit(local_ssap, sdp);
 496
 497                         /* Find the listening sock and set it back to UNBOUND */
 498                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 499                         if (l_sock) {
 500                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 501                                 nfc_llcp_sock_put(l_sock);
 502                         }
 503                 }
 504
 505                 mutex_unlock(&local->sdp_lock);
 506
 507                 return;
 508         } else if (ssap < LLCP_MAX_SAP) {
 509                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 510                 sdp = &local->local_sap;
 511         } else {
 512                 return;
 513         }
 514
 515         mutex_lock(&local->sdp_lock);
 516
 517         clear_bit(local_ssap, sdp);
 518
 519         mutex_unlock(&local->sdp_lock);
 520 }
 521
 522 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 523 {
 524         u8 ssap;
 525
 526         mutex_lock(&local->sdp_lock);
 527
 528         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 529         if (ssap == LLCP_SDP_NUM_SAP) {
 530                 mutex_unlock(&local->sdp_lock);
 531
 532                 return LLCP_SAP_MAX;
 533         }
 534
 535         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 536
 537         set_bit(ssap, &local->local_sdp);
 538
 539         mutex_unlock(&local->sdp_lock);
 540
 541         return LLCP_WKS_NUM_SAP + ssap;
 542 }
 543
 544 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 545 {
 546         u8 *gb_cur, *version_tlv, version, version_length;
 547         u8 *lto_tlv, lto_length;
 548         u8 *wks_tlv, wks_length;
 549         u8 *miux_tlv, miux_length;
 550         u8 gb_len = 0;
 551         int ret = 0;
 552
 553         version = LLCP_VERSION_11;
 554         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 555                                          1, &version_length);
 556         gb_len += version_length;
 557
 558         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 559         gb_len += lto_length;
 560
 561         pr_debug("Local wks 0x%lx\n", local->local_wks);
 562         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
 563                                      &wks_length);
 564         gb_len += wks_length;
 565
 566         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 567                                       &miux_length);
 568         gb_len += miux_length;
 569
 570         gb_len += ARRAY_SIZE(llcp_magic);
 571
 572         if (gb_len > NFC_MAX_GT_LEN) {
 573                 ret = -EINVAL;
 574                 goto out;
 575         }
 576
 577         gb_cur = local->gb;
 578
 579         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 580         gb_cur += ARRAY_SIZE(llcp_magic);
 581
 582         memcpy(gb_cur, version_tlv, version_length);
 583         gb_cur += version_length;
 584
 585         memcpy(gb_cur, lto_tlv, lto_length);
 586         gb_cur += lto_length;
 587
 588         memcpy(gb_cur, wks_tlv, wks_length);
 589         gb_cur += wks_length;
 590
 591         memcpy(gb_cur, miux_tlv, miux_length);
 592         gb_cur += miux_length;
 593
 594         local->gb_len = gb_len;
 595
 596 out:
 597         kfree(version_tlv);
 598         kfree(lto_tlv);
 599         kfree(wks_tlv);
 600         kfree(miux_tlv);
 601
 602         return ret;
 603 }
 604
 605 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 606 {
 607         struct nfc_llcp_local *local;
 608
 609         local = nfc_llcp_find_local(dev);
 610         if (local == NULL) {
 611                 *general_bytes_len = 0;
 612                 return NULL;
 613         }
 614
 615         nfc_llcp_build_gb(local);
 616
 617         *general_bytes_len = local->gb_len;
 618
 619         return local->gb;
 620 }
 621
 622 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 623 {
 624         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
 625
 626         if (local == NULL) {
 627                 pr_err("No LLCP device\n");
 628                 return -ENODEV;
 629         }
 630         if (gb_len < 3)
 631                 return -EINVAL;
 632
 633         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 634         memcpy(local->remote_gb, gb, gb_len);
 635         local->remote_gb_len = gb_len;
 636
 637         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 638                 pr_err("MAC does not support LLCP\n");
 639                 return -EINVAL;
 640         }
 641
 642         return nfc_llcp_parse_gb_tlv(local,
 643                                      &local->remote_gb[3],
 644                                      local->remote_gb_len - 3);
 645 }
 646
 647 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
 648 {
 649         return (pdu->data[0] & 0xfc) >> 2;
 650 }
 651
 652 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
 653 {
 654         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 655 }
 656
 657 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
 658 {
 659         return pdu->data[1] & 0x3f;
 660 }
 661
 662 static u8 nfc_llcp_ns(struct sk_buff *pdu)
 663 {
 664         return pdu->data[2] >> 4;
 665 }
 666
 667 static u8 nfc_llcp_nr(struct sk_buff *pdu)
 668 {
 669         return pdu->data[2] & 0xf;
 670 }
 671
 672 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 673 {
 674         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 675         sock->send_n = (sock->send_n + 1) % 16;
 676         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 677 }
 678
 679 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 680                                struct sk_buff *skb, u8 direction)
 681 {
 682         struct sk_buff *skb_copy = NULL, *nskb;
 683         struct sock *sk;
 684         u8 *data;
 685
 686         read_lock(&local->raw_sockets.lock);
 687
 688         sk_for_each(sk, &local->raw_sockets.head) {
 689                 if (sk->sk_state != LLCP_BOUND)
 690                         continue;
 691
 692                 if (skb_copy == NULL) {
 693                         skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
 694                                                GFP_ATOMIC);
 695
 696                         if (skb_copy == NULL)
 697                                 continue;
 698
 699                         data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
 700
 701                         data[0] = local->dev ? local->dev->idx : 0xFF;
 702                         data[1] = direction;
 703                 }
 704
 705                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 706                 if (!nskb)
 707                         continue;
 708
 709                 if (sock_queue_rcv_skb(sk, nskb))
 710                         kfree_skb(nskb);
 711         }
 712
 713         read_unlock(&local->raw_sockets.lock);
 714
 715         kfree_skb(skb_copy);
 716 }
 717
 718 static void nfc_llcp_tx_work(struct work_struct *work)
 719 {
 720         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 721                                                     tx_work);
 722         struct sk_buff *skb;
 723         struct sock *sk;
 724         struct nfc_llcp_sock *llcp_sock;
 725
 726         skb = skb_dequeue(&local->tx_queue);
 727         if (skb != NULL) {
 728                 sk = skb->sk;
 729                 llcp_sock = nfc_llcp_sock(sk);
 730
 731                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 732                         nfc_llcp_send_symm(local->dev);
 733                 } else {
 734                         struct sk_buff *copy_skb = NULL;
 735                         u8 ptype = nfc_llcp_ptype(skb);
 736                         int ret;
 737
 738                         pr_debug("Sending pending skb\n");
 739                         print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
 740                                        DUMP_PREFIX_OFFSET, 16, 1,
 741                                        skb->data, skb->len, true);
 742
 743                         if (ptype == LLCP_PDU_I)
 744                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 745
 746                         __net_timestamp(skb);
 747
 748                         nfc_llcp_send_to_raw_sock(local, skb,
 749                                                   NFC_LLCP_DIRECTION_TX);
 750
 751                         ret = nfc_data_exchange(local->dev, local->target_idx,
 752                                                 skb, nfc_llcp_recv, local);
 753
 754                         if (ret) {
 755                                 kfree_skb(copy_skb);
 756                                 goto out;
 757                         }
 758
 759                         if (ptype == LLCP_PDU_I && copy_skb)
 760                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 761                                                copy_skb);
 762                 }
 763         } else {
 764                 nfc_llcp_send_symm(local->dev);
 765         }
 766
 767 out:
 768         mod_timer(&local->link_timer,
 769                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 770 }
 771
 772 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 773                                                           u8 ssap)
 774 {
 775         struct sock *sk;
 776         struct nfc_llcp_sock *llcp_sock;
 777
 778         read_lock(&local->connecting_sockets.lock);
 779
 780         sk_for_each(sk, &local->connecting_sockets.head) {
 781                 llcp_sock = nfc_llcp_sock(sk);
 782
 783                 if (llcp_sock->ssap == ssap) {
 784                         sock_hold(&llcp_sock->sk);
 785                         goto out;
 786                 }
 787         }
 788
 789         llcp_sock = NULL;
 790
 791 out:
 792         read_unlock(&local->connecting_sockets.lock);
 793
 794         return llcp_sock;
 795 }
 796
 797 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 798                                                   u8 *sn, size_t sn_len)
 799 {
 800         struct nfc_llcp_sock *llcp_sock;
 801
 802         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 803
 804         if (llcp_sock == NULL)
 805                 return NULL;
 806
 807         sock_hold(&llcp_sock->sk);
 808
 809         return llcp_sock;
 810 }
 811
 812 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
 813 {
 814         u8 *tlv = &skb->data[2], type, length;
 815         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 816
 817         while (offset < tlv_array_len) {
 818                 type = tlv[0];
 819                 length = tlv[1];
 820
 821                 pr_debug("type 0x%x length %d\n", type, length);
 822
 823                 if (type == LLCP_TLV_SN) {
 824                         *sn_len = length;
 825                         return &tlv[2];
 826                 }
 827
 828                 offset += length + 2;
 829                 tlv += length + 2;
 830         }
 831
 832         return NULL;
 833 }
 834
 835 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 836                              struct sk_buff *skb)
 837 {
 838         struct nfc_llcp_sock *llcp_sock;
 839         struct nfc_llcp_ui_cb *ui_cb;
 840         u8 dsap, ssap;
 841
 842         dsap = nfc_llcp_dsap(skb);
 843         ssap = nfc_llcp_ssap(skb);
 844
 845         ui_cb = nfc_llcp_ui_skb_cb(skb);
 846         ui_cb->dsap = dsap;
 847         ui_cb->ssap = ssap;
 848
 849         pr_debug("%d %d\n", dsap, ssap);
 850
 851         /* We're looking for a bound socket, not a client one */
 852         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 853         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 854                 return;
 855
 856         /* There is no sequence with UI frames */
 857         skb_pull(skb, LLCP_HEADER_SIZE);
 858         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 859                 /*
 860                  * UI frames will be freed from the socket layer, so we
 861                  * need to keep them alive until someone receives them.
 862                  */
 863                 skb_get(skb);
 864         } else {
 865                 pr_err("Receive queue is full\n");
 866         }
 867
 868         nfc_llcp_sock_put(llcp_sock);
 869 }
 870
 871 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 872                                   struct sk_buff *skb)
 873 {
 874         struct sock *new_sk, *parent;
 875         struct nfc_llcp_sock *sock, *new_sock;
 876         u8 dsap, ssap, reason;
 877
 878         dsap = nfc_llcp_dsap(skb);
 879         ssap = nfc_llcp_ssap(skb);
 880
 881         pr_debug("%d %d\n", dsap, ssap);
 882
 883         if (dsap != LLCP_SAP_SDP) {
 884                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 885                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 886                         reason = LLCP_DM_NOBOUND;
 887                         goto fail;
 888                 }
 889         } else {
 890                 u8 *sn;
 891                 size_t sn_len;
 892
 893                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 894                 if (sn == NULL) {
 895                         reason = LLCP_DM_NOBOUND;
 896                         goto fail;
 897                 }
 898
 899                 pr_debug("Service name length %zu\n", sn_len);
 900
 901                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 902                 if (sock == NULL) {
 903                         reason = LLCP_DM_NOBOUND;
 904                         goto fail;
 905                 }
 906         }
 907
 908         lock_sock(&sock->sk);
 909
 910         parent = &sock->sk;
 911
 912         if (sk_acceptq_is_full(parent)) {
 913                 reason = LLCP_DM_REJ;
 914                 release_sock(&sock->sk);
 915                 sock_put(&sock->sk);
 916                 goto fail;
 917         }
 918
 919         if (sock->ssap == LLCP_SDP_UNBOUND) {
 920                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 921
 922                 pr_debug("First client, reserving %d\n", ssap);
 923
 924                 if (ssap == LLCP_SAP_MAX) {
 925                         reason = LLCP_DM_REJ;
 926                         release_sock(&sock->sk);
 927                         sock_put(&sock->sk);
 928                         goto fail;
 929                 }
 930
 931                 sock->ssap = ssap;
 932         }
 933
 934         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
 935         if (new_sk == NULL) {
 936                 reason = LLCP_DM_REJ;
 937                 release_sock(&sock->sk);
 938                 sock_put(&sock->sk);
 939                 goto fail;
 940         }
 941
 942         new_sock = nfc_llcp_sock(new_sk);
 943         new_sock->dev = local->dev;
 944         new_sock->local = nfc_llcp_local_get(local);
 945         new_sock->rw = sock->rw;
 946         new_sock->miux = sock->miux;
 947         new_sock->remote_miu = local->remote_miu;
 948         new_sock->nfc_protocol = sock->nfc_protocol;
 949         new_sock->dsap = ssap;
 950         new_sock->target_idx = local->target_idx;
 951         new_sock->parent = parent;
 952         new_sock->ssap = sock->ssap;
 953         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 954                 atomic_t *client_count;
 955
 956                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 957
 958                 client_count =
 959                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 960
 961                 atomic_inc(client_count);
 962                 new_sock->reserved_ssap = sock->ssap;
 963         }
 964
 965         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 966                                       skb->len - LLCP_HEADER_SIZE);
 967
 968         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 969
 970         nfc_llcp_sock_link(&local->sockets, new_sk);
 971
 972         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 973
 974         nfc_get_device(local->dev->idx);
 975
 976         new_sk->sk_state = LLCP_CONNECTED;
 977
 978         /* Wake the listening processes */
 979         parent->sk_data_ready(parent, 0);
 980
 981         /* Send CC */
 982         nfc_llcp_send_cc(new_sock);
 983
 984         release_sock(&sock->sk);
 985         sock_put(&sock->sk);
 986
 987         return;
 988
 989 fail:
 990         /* Send DM */
 991         nfc_llcp_send_dm(local, dsap, ssap, reason);
 992 }
 993
 994 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
 995 {
 996         int nr_frames = 0;
 997         struct nfc_llcp_local *local = sock->local;
 998
 999         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1000                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1001                  sock->remote_rw);
1002
1003         /* Try to queue some I frames for transmission */
1004         while (sock->remote_ready &&
1005                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1006                 struct sk_buff *pdu;
1007
1008                 pdu = skb_dequeue(&sock->tx_queue);
1009                 if (pdu == NULL)
1010                         break;
1011
1012                 /* Update N(S)/N(R) */
1013                 nfc_llcp_set_nrns(sock, pdu);
1014
1015                 skb_queue_tail(&local->tx_queue, pdu);
1016                 nr_frames++;
1017         }
1018
1019         return nr_frames;
1020 }
1021
1022 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1023                                struct sk_buff *skb)
1024 {
1025         struct nfc_llcp_sock *llcp_sock;
1026         struct sock *sk;
1027         u8 dsap, ssap, ptype, ns, nr;
1028
1029         ptype = nfc_llcp_ptype(skb);
1030         dsap = nfc_llcp_dsap(skb);
1031         ssap = nfc_llcp_ssap(skb);
1032         ns = nfc_llcp_ns(skb);
1033         nr = nfc_llcp_nr(skb);
1034
1035         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1036
1037         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1038         if (llcp_sock == NULL) {
1039                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1040                 return;
1041         }
1042
1043         sk = &llcp_sock->sk;
1044         lock_sock(sk);
1045         if (sk->sk_state == LLCP_CLOSED) {
1046                 release_sock(sk);
1047                 nfc_llcp_sock_put(llcp_sock);
1048         }
1049
1050         /* Pass the payload upstream */
1051         if (ptype == LLCP_PDU_I) {
1052                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1053
1054                 if (ns == llcp_sock->recv_n)
1055                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1056                 else
1057                         pr_err("Received out of sequence I PDU\n");
1058
1059                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1060                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1061                         /*
1062                          * I frames will be freed from the socket layer, so we
1063                          * need to keep them alive until someone receives them.
1064                          */
1065                         skb_get(skb);
1066                 } else {
1067                         pr_err("Receive queue is full\n");
1068                 }
1069         }
1070
1071         /* Remove skbs from the pending queue */
1072         if (llcp_sock->send_ack_n != nr) {
1073                 struct sk_buff *s, *tmp;
1074                 u8 n;
1075
1076                 llcp_sock->send_ack_n = nr;
1077
1078                 /* Remove and free all skbs until ns == nr */
1079                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1080                         n = nfc_llcp_ns(s);
1081
1082                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1083                         kfree_skb(s);
1084
1085                         if (n == nr)
1086                                 break;
1087                 }
1088
1089                 /* Re-queue the remaining skbs for transmission */
1090                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1091                                             s, tmp) {
1092                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1093                         skb_queue_head(&local->tx_queue, s);
1094                 }
1095         }
1096
1097         if (ptype == LLCP_PDU_RR)
1098                 llcp_sock->remote_ready = true;
1099         else if (ptype == LLCP_PDU_RNR)
1100                 llcp_sock->remote_ready = false;
1101
1102         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1103                 nfc_llcp_send_rr(llcp_sock);
1104
1105         release_sock(sk);
1106         nfc_llcp_sock_put(llcp_sock);
1107 }
1108
1109 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1110                                struct sk_buff *skb)
1111 {
1112         struct nfc_llcp_sock *llcp_sock;
1113         struct sock *sk;
1114         u8 dsap, ssap;
1115
1116         dsap = nfc_llcp_dsap(skb);
1117         ssap = nfc_llcp_ssap(skb);
1118
1119         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1120         if (llcp_sock == NULL) {
1121                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1122                 return;
1123         }
1124
1125         sk = &llcp_sock->sk;
1126         lock_sock(sk);
1127
1128         nfc_llcp_socket_purge(llcp_sock);
1129
1130         if (sk->sk_state == LLCP_CLOSED) {
1131                 release_sock(sk);
1132                 nfc_llcp_sock_put(llcp_sock);
1133         }
1134
1135         if (sk->sk_state == LLCP_CONNECTED) {
1136                 nfc_put_device(local->dev);
1137                 sk->sk_state = LLCP_CLOSED;
1138                 sk->sk_state_change(sk);
1139         }
1140
1141         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1142
1143         release_sock(sk);
1144         nfc_llcp_sock_put(llcp_sock);
1145 }
1146
1147 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1148 {
1149         struct nfc_llcp_sock *llcp_sock;
1150         struct sock *sk;
1151         u8 dsap, ssap;
1152
1153         dsap = nfc_llcp_dsap(skb);
1154         ssap = nfc_llcp_ssap(skb);
1155
1156         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1157         if (llcp_sock == NULL) {
1158                 pr_err("Invalid CC\n");
1159                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1160
1161                 return;
1162         }
1163
1164         sk = &llcp_sock->sk;
1165
1166         /* Unlink from connecting and link to the client array */
1167         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1168         nfc_llcp_sock_link(&local->sockets, sk);
1169         llcp_sock->dsap = ssap;
1170
1171         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1172                                       skb->len - LLCP_HEADER_SIZE);
1173
1174         sk->sk_state = LLCP_CONNECTED;
1175         sk->sk_state_change(sk);
1176
1177         nfc_llcp_sock_put(llcp_sock);
1178 }
1179
1180 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1181 {
1182         struct nfc_llcp_sock *llcp_sock;
1183         struct sock *sk;
1184         u8 dsap, ssap, reason;
1185
1186         dsap = nfc_llcp_dsap(skb);
1187         ssap = nfc_llcp_ssap(skb);
1188         reason = skb->data[2];
1189
1190         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1191
1192         switch (reason) {
1193         case LLCP_DM_NOBOUND:
1194         case LLCP_DM_REJ:
1195                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1196                 break;
1197
1198         default:
1199                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1200                 break;
1201         }
1202
1203         if (llcp_sock == NULL) {
1204                 pr_debug("Already closed\n");
1205                 return;
1206         }
1207
1208         sk = &llcp_sock->sk;
1209
1210         sk->sk_err = ENXIO;
1211         sk->sk_state = LLCP_CLOSED;
1212         sk->sk_state_change(sk);
1213
1214         nfc_llcp_sock_put(llcp_sock);
1215 }
1216
1217 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1218                               struct sk_buff *skb)
1219 {
1220         struct nfc_llcp_sock *llcp_sock;
1221         u8 dsap, ssap, *tlv, type, length, tid, sap;
1222         u16 tlv_len, offset;
1223         char *service_name;
1224         size_t service_name_len;
1225         struct nfc_llcp_sdp_tlv *sdp;
1226         HLIST_HEAD(llc_sdres_list);
1227         size_t sdres_tlvs_len;
1228         HLIST_HEAD(nl_sdres_list);
1229
1230         dsap = nfc_llcp_dsap(skb);
1231         ssap = nfc_llcp_ssap(skb);
1232
1233         pr_debug("%d %d\n", dsap, ssap);
1234
1235         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1236                 pr_err("Wrong SNL SAP\n");
1237                 return;
1238         }
1239
1240         tlv = &skb->data[LLCP_HEADER_SIZE];
1241         tlv_len = skb->len - LLCP_HEADER_SIZE;
1242         offset = 0;
1243         sdres_tlvs_len = 0;
1244
1245         while (offset < tlv_len) {
1246                 type = tlv[0];
1247                 length = tlv[1];
1248
1249                 switch (type) {
1250                 case LLCP_TLV_SDREQ:
1251                         tid = tlv[2];
1252                         service_name = (char *) &tlv[3];
1253                         service_name_len = length - 1;
1254
1255                         pr_debug("Looking for %.16s\n", service_name);
1256
1257                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1258                             !strncmp(service_name, "urn:nfc:sn:sdp",
1259                                      service_name_len)) {
1260                                 sap = 1;
1261                                 goto add_snl;
1262                         }
1263
1264                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1265                                                           service_name_len);
1266                         if (!llcp_sock) {
1267                                 sap = 0;
1268                                 goto add_snl;
1269                         }
1270
1271                         /*
1272                          * We found a socket but its ssap has not been reserved
1273                          * yet. We need to assign it for good and send a reply.
1274                          * The ssap will be freed when the socket is closed.
1275                          */
1276                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1277                                 atomic_t *client_count;
1278
1279                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1280
1281                                 pr_debug("Reserving %d\n", sap);
1282
1283                                 if (sap == LLCP_SAP_MAX) {
1284                                         sap = 0;
1285                                         goto add_snl;
1286                                 }
1287
1288                                 client_count =
1289                                         &local->local_sdp_cnt[sap -
1290                                                               LLCP_WKS_NUM_SAP];
1291
1292                                 atomic_inc(client_count);
1293
1294                                 llcp_sock->ssap = sap;
1295                                 llcp_sock->reserved_ssap = sap;
1296                         } else {
1297                                 sap = llcp_sock->ssap;
1298                         }
1299
1300                         pr_debug("%p %d\n", llcp_sock, sap);
1301
1302 add_snl:
1303                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1304                         if (sdp == NULL)
1305                                 goto exit;
1306
1307                         sdres_tlvs_len += sdp->tlv_len;
1308                         hlist_add_head(&sdp->node, &llc_sdres_list);
1309                         break;
1310
1311                 case LLCP_TLV_SDRES:
1312                         mutex_lock(&local->sdreq_lock);
1313
1314                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1315
1316                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1317                                 if (sdp->tid != tlv[2])
1318                                         continue;
1319
1320                                 sdp->sap = tlv[3];
1321
1322                                 pr_debug("Found: uri=%s, sap=%d\n",
1323                                          sdp->uri, sdp->sap);
1324
1325                                 hlist_del(&sdp->node);
1326
1327                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1328
1329                                 break;
1330                         }
1331
1332                         mutex_unlock(&local->sdreq_lock);
1333                         break;
1334
1335                 default:
1336                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1337                         break;
1338                 }
1339
1340                 offset += length + 2;
1341                 tlv += length + 2;
1342         }
1343
1344 exit:
1345         if (!hlist_empty(&nl_sdres_list))
1346                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1347
1348         if (!hlist_empty(&llc_sdres_list))
1349                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1350 }
1351
1352 static void nfc_llcp_rx_work(struct work_struct *work)
1353 {
1354         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1355                                                     rx_work);
1356         u8 dsap, ssap, ptype;
1357         struct sk_buff *skb;
1358
1359         skb = local->rx_pending;
1360         if (skb == NULL) {
1361                 pr_debug("No pending SKB\n");
1362                 return;
1363         }
1364
1365         ptype = nfc_llcp_ptype(skb);
1366         dsap = nfc_llcp_dsap(skb);
1367         ssap = nfc_llcp_ssap(skb);
1368
1369         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1370
1371         if (ptype != LLCP_PDU_SYMM)
1372                 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1373                                16, 1, skb->data, skb->len, true);
1374
1375         __net_timestamp(skb);
1376
1377         nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1378
1379         switch (ptype) {
1380         case LLCP_PDU_SYMM:
1381                 pr_debug("SYMM\n");
1382                 break;
1383
1384         case LLCP_PDU_UI:
1385                 pr_debug("UI\n");
1386                 nfc_llcp_recv_ui(local, skb);
1387                 break;
1388
1389         case LLCP_PDU_CONNECT:
1390                 pr_debug("CONNECT\n");
1391                 nfc_llcp_recv_connect(local, skb);
1392                 break;
1393
1394         case LLCP_PDU_DISC:
1395                 pr_debug("DISC\n");
1396                 nfc_llcp_recv_disc(local, skb);
1397                 break;
1398
1399         case LLCP_PDU_CC:
1400                 pr_debug("CC\n");
1401                 nfc_llcp_recv_cc(local, skb);
1402                 break;
1403
1404         case LLCP_PDU_DM:
1405                 pr_debug("DM\n");
1406                 nfc_llcp_recv_dm(local, skb);
1407                 break;
1408
1409         case LLCP_PDU_SNL:
1410                 pr_debug("SNL\n");
1411                 nfc_llcp_recv_snl(local, skb);
1412                 break;
1413
1414         case LLCP_PDU_I:
1415         case LLCP_PDU_RR:
1416         case LLCP_PDU_RNR:
1417                 pr_debug("I frame\n");
1418                 nfc_llcp_recv_hdlc(local, skb);
1419                 break;
1420
1421         }
1422
1423         schedule_work(&local->tx_work);
1424         kfree_skb(local->rx_pending);
1425         local->rx_pending = NULL;
1426 }
1427
1428 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1429 {
1430         local->rx_pending = skb;
1431         del_timer(&local->link_timer);
1432         schedule_work(&local->rx_work);
1433 }
1434
1435 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1436 {
1437         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1438
1439         pr_debug("Received an LLCP PDU\n");
1440         if (err < 0) {
1441                 pr_err("err %d\n", err);
1442                 return;
1443         }
1444
1445         __nfc_llcp_recv(local, skb);
1446 }
1447
1448 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1449 {
1450         struct nfc_llcp_local *local;
1451
1452         local = nfc_llcp_find_local(dev);
1453         if (local == NULL)
1454                 return -ENODEV;
1455
1456         __nfc_llcp_recv(local, skb);
1457
1458         return 0;
1459 }
1460
1461 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1462 {
1463         struct nfc_llcp_local *local;
1464
1465         local = nfc_llcp_find_local(dev);
1466         if (local == NULL)
1467                 return;
1468
1469         /* Close and purge all existing sockets */
1470         nfc_llcp_socket_release(local, true, 0);
1471 }
1472
1473 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1474                         u8 comm_mode, u8 rf_mode)
1475 {
1476         struct nfc_llcp_local *local;
1477
1478         pr_debug("rf mode %d\n", rf_mode);
1479
1480         local = nfc_llcp_find_local(dev);
1481         if (local == NULL)
1482                 return;
1483
1484         local->target_idx = target_idx;
1485         local->comm_mode = comm_mode;
1486         local->rf_mode = rf_mode;
1487
1488         if (rf_mode == NFC_RF_INITIATOR) {
1489                 pr_debug("Queueing Tx work\n");
1490
1491                 schedule_work(&local->tx_work);
1492         } else {
1493                 mod_timer(&local->link_timer,
1494                           jiffies + msecs_to_jiffies(local->remote_lto));
1495         }
1496 }
1497
1498 int nfc_llcp_register_device(struct nfc_dev *ndev)
1499 {
1500         struct nfc_llcp_local *local;
1501
1502         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1503         if (local == NULL)
1504                 return -ENOMEM;
1505
1506         local->dev = ndev;
1507         INIT_LIST_HEAD(&local->list);
1508         kref_init(&local->ref);
1509         mutex_init(&local->sdp_lock);
1510         init_timer(&local->link_timer);
1511         local->link_timer.data = (unsigned long) local;
1512         local->link_timer.function = nfc_llcp_symm_timer;
1513
1514         skb_queue_head_init(&local->tx_queue);
1515         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1516
1517         local->rx_pending = NULL;
1518         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1519
1520         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1521
1522         rwlock_init(&local->sockets.lock);
1523         rwlock_init(&local->connecting_sockets.lock);
1524         rwlock_init(&local->raw_sockets.lock);
1525
1526         local->lto = 150; /* 1500 ms */
1527         local->rw = LLCP_MAX_RW;
1528         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1529
1530         nfc_llcp_build_gb(local);
1531
1532         local->remote_miu = LLCP_DEFAULT_MIU;
1533         local->remote_lto = LLCP_DEFAULT_LTO;
1534
1535         mutex_init(&local->sdreq_lock);
1536         INIT_HLIST_HEAD(&local->pending_sdreqs);
1537         init_timer(&local->sdreq_timer);
1538         local->sdreq_timer.data = (unsigned long) local;
1539         local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1540         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1541
1542         list_add(&local->list, &llcp_devices);
1543
1544         return 0;
1545 }
1546
1547 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1548 {
1549         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1550
1551         if (local == NULL) {
1552                 pr_debug("No such device\n");
1553                 return;
1554         }
1555
1556         local_cleanup(local, false);
1557
1558         nfc_llcp_local_put(local);
1559 }
1560
1561 int __init nfc_llcp_init(void)
1562 {
1563         INIT_LIST_HEAD(&llcp_devices);
1564
1565         return nfc_llcp_sock_init();
1566 }
1567
1568 void nfc_llcp_exit(void)
1569 {
1570         nfc_llcp_sock_exit();
1571 }