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         del_timer_sync(&local->sdreq_timer);
 192         cancel_work_sync(&local->sdreq_timeout_work);
 193         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
 194 }
 195
 196 static void local_release(struct kref *ref)
 197 {
 198         struct nfc_llcp_local *local;
 199
 200         local = container_of(ref, struct nfc_llcp_local, ref);
 201
 202         list_del(&local->list);
 203         local_cleanup(local, false);
 204         kfree(local);
 205 }
 206
 207 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 208 {
 209         if (local == NULL)
 210                 return 0;
 211
 212         return kref_put(&local->ref, local_release);
 213 }
 214
 215 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 216                                                u8 ssap, u8 dsap)
 217 {
 218         struct sock *sk;
 219         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 220
 221         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 222
 223         if (ssap == 0 && dsap == 0)
 224                 return NULL;
 225
 226         read_lock(&local->sockets.lock);
 227
 228         llcp_sock = NULL;
 229
 230         sk_for_each(sk, &local->sockets.head) {
 231                 tmp_sock = nfc_llcp_sock(sk);
 232
 233                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 234                         llcp_sock = tmp_sock;
 235                         break;
 236                 }
 237         }
 238
 239         read_unlock(&local->sockets.lock);
 240
 241         if (llcp_sock == NULL)
 242                 return NULL;
 243
 244         sock_hold(&llcp_sock->sk);
 245
 246         return llcp_sock;
 247 }
 248
 249 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 250 {
 251         sock_put(&sock->sk);
 252 }
 253
 254 static void nfc_llcp_timeout_work(struct work_struct *work)
 255 {
 256         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 257                                                     timeout_work);
 258
 259         nfc_dep_link_down(local->dev);
 260 }
 261
 262 static void nfc_llcp_symm_timer(unsigned long data)
 263 {
 264         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 265
 266         pr_err("SYMM timeout\n");
 267
 268         schedule_work(&local->timeout_work);
 269 }
 270
 271 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
 272 {
 273         unsigned long time;
 274         HLIST_HEAD(nl_sdres_list);
 275         struct hlist_node *n;
 276         struct nfc_llcp_sdp_tlv *sdp;
 277         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 278                                                     sdreq_timeout_work);
 279
 280         mutex_lock(&local->sdreq_lock);
 281
 282         time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
 283
 284         hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
 285                 if (time_after(sdp->time, time))
 286                         continue;
 287
 288                 sdp->sap = LLCP_SDP_UNBOUND;
 289
 290                 hlist_del(&sdp->node);
 291
 292                 hlist_add_head(&sdp->node, &nl_sdres_list);
 293         }
 294
 295         if (!hlist_empty(&local->pending_sdreqs))
 296                 mod_timer(&local->sdreq_timer,
 297                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
 298
 299         mutex_unlock(&local->sdreq_lock);
 300
 301         if (!hlist_empty(&nl_sdres_list))
 302                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
 303 }
 304
 305 static void nfc_llcp_sdreq_timer(unsigned long data)
 306 {
 307         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 308
 309         schedule_work(&local->sdreq_timeout_work);
 310 }
 311
 312 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 313 {
 314         struct nfc_llcp_local *local, *n;
 315
 316         list_for_each_entry_safe(local, n, &llcp_devices, list)
 317                 if (local->dev == dev)
 318                         return local;
 319
 320         pr_debug("No device found\n");
 321
 322         return NULL;
 323 }
 324
 325 static char *wks[] = {
 326         NULL,
 327         NULL, /* SDP */
 328         "urn:nfc:sn:ip",
 329         "urn:nfc:sn:obex",
 330         "urn:nfc:sn:snep",
 331 };
 332
 333 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
 334 {
 335         int sap, num_wks;
 336
 337         pr_debug("%s\n", service_name);
 338
 339         if (service_name == NULL)
 340                 return -EINVAL;
 341
 342         num_wks = ARRAY_SIZE(wks);
 343
 344         for (sap = 0; sap < num_wks; sap++) {
 345                 if (wks[sap] == NULL)
 346                         continue;
 347
 348                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 349                         return sap;
 350         }
 351
 352         return -EINVAL;
 353 }
 354
 355 static
 356 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 357                                             u8 *sn, size_t sn_len)
 358 {
 359         struct sock *sk;
 360         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 361
 362         pr_debug("sn %zd %p\n", sn_len, sn);
 363
 364         if (sn == NULL || sn_len == 0)
 365                 return NULL;
 366
 367         read_lock(&local->sockets.lock);
 368
 369         llcp_sock = NULL;
 370
 371         sk_for_each(sk, &local->sockets.head) {
 372                 tmp_sock = nfc_llcp_sock(sk);
 373
 374                 pr_debug("llcp sock %p\n", tmp_sock);
 375
 376                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 377                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 378                         continue;
 379
 380                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 381                     tmp_sock->sk.sk_state != LLCP_BOUND)
 382                         continue;
 383
 384                 if (tmp_sock->service_name == NULL ||
 385                     tmp_sock->service_name_len == 0)
 386                         continue;
 387
 388                 if (tmp_sock->service_name_len != sn_len)
 389                         continue;
 390
 391                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 392                         llcp_sock = tmp_sock;
 393                         break;
 394                 }
 395         }
 396
 397         read_unlock(&local->sockets.lock);
 398
 399         pr_debug("Found llcp sock %p\n", llcp_sock);
 400
 401         return llcp_sock;
 402 }
 403
 404 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 405                          struct nfc_llcp_sock *sock)
 406 {
 407         mutex_lock(&local->sdp_lock);
 408
 409         if (sock->service_name != NULL && sock->service_name_len > 0) {
 410                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 411                                             sock->service_name_len);
 412
 413                 if (ssap > 0) {
 414                         pr_debug("WKS %d\n", ssap);
 415
 416                         /* This is a WKS, let's check if it's free */
 417                         if (local->local_wks & BIT(ssap)) {
 418                                 mutex_unlock(&local->sdp_lock);
 419
 420                                 return LLCP_SAP_MAX;
 421                         }
 422
 423                         set_bit(ssap, &local->local_wks);
 424                         mutex_unlock(&local->sdp_lock);
 425
 426                         return ssap;
 427                 }
 428
 429                 /*
 430                  * Check if there already is a non WKS socket bound
 431                  * to this service name.
 432                  */
 433                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 434                                           sock->service_name_len) != NULL) {
 435                         mutex_unlock(&local->sdp_lock);
 436
 437                         return LLCP_SAP_MAX;
 438                 }
 439
 440                 mutex_unlock(&local->sdp_lock);
 441
 442                 return LLCP_SDP_UNBOUND;
 443
 444         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 445                 if (!test_bit(sock->ssap, &local->local_wks)) {
 446                         set_bit(sock->ssap, &local->local_wks);
 447                         mutex_unlock(&local->sdp_lock);
 448
 449                         return sock->ssap;
 450                 }
 451         }
 452
 453         mutex_unlock(&local->sdp_lock);
 454
 455         return LLCP_SAP_MAX;
 456 }
 457
 458 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 459 {
 460         u8 local_ssap;
 461
 462         mutex_lock(&local->sdp_lock);
 463
 464         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 465         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 466                 mutex_unlock(&local->sdp_lock);
 467                 return LLCP_SAP_MAX;
 468         }
 469
 470         set_bit(local_ssap, &local->local_sap);
 471
 472         mutex_unlock(&local->sdp_lock);
 473
 474         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 475 }
 476
 477 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 478 {
 479         u8 local_ssap;
 480         unsigned long *sdp;
 481
 482         if (ssap < LLCP_WKS_NUM_SAP) {
 483                 local_ssap = ssap;
 484                 sdp = &local->local_wks;
 485         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 486                 atomic_t *client_cnt;
 487
 488                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 489                 sdp = &local->local_sdp;
 490                 client_cnt = &local->local_sdp_cnt[local_ssap];
 491
 492                 pr_debug("%d clients\n", atomic_read(client_cnt));
 493
 494                 mutex_lock(&local->sdp_lock);
 495
 496                 if (atomic_dec_and_test(client_cnt)) {
 497                         struct nfc_llcp_sock *l_sock;
 498
 499                         pr_debug("No more clients for SAP %d\n", ssap);
 500
 501                         clear_bit(local_ssap, sdp);
 502
 503                         /* Find the listening sock and set it back to UNBOUND */
 504                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 505                         if (l_sock) {
 506                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 507                                 nfc_llcp_sock_put(l_sock);
 508                         }
 509                 }
 510
 511                 mutex_unlock(&local->sdp_lock);
 512
 513                 return;
 514         } else if (ssap < LLCP_MAX_SAP) {
 515                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 516                 sdp = &local->local_sap;
 517         } else {
 518                 return;
 519         }
 520
 521         mutex_lock(&local->sdp_lock);
 522
 523         clear_bit(local_ssap, sdp);
 524
 525         mutex_unlock(&local->sdp_lock);
 526 }
 527
 528 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 529 {
 530         u8 ssap;
 531
 532         mutex_lock(&local->sdp_lock);
 533
 534         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 535         if (ssap == LLCP_SDP_NUM_SAP) {
 536                 mutex_unlock(&local->sdp_lock);
 537
 538                 return LLCP_SAP_MAX;
 539         }
 540
 541         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 542
 543         set_bit(ssap, &local->local_sdp);
 544
 545         mutex_unlock(&local->sdp_lock);
 546
 547         return LLCP_WKS_NUM_SAP + ssap;
 548 }
 549
 550 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 551 {
 552         u8 *gb_cur, *version_tlv, version, version_length;
 553         u8 *lto_tlv, lto_length;
 554         u8 *wks_tlv, wks_length;
 555         u8 *miux_tlv, miux_length;
 556         u8 gb_len = 0;
 557         int ret = 0;
 558
 559         version = LLCP_VERSION_11;
 560         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 561                                          1, &version_length);
 562         gb_len += version_length;
 563
 564         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 565         gb_len += lto_length;
 566
 567         pr_debug("Local wks 0x%lx\n", local->local_wks);
 568         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
 569                                      &wks_length);
 570         gb_len += wks_length;
 571
 572         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 573                                       &miux_length);
 574         gb_len += miux_length;
 575
 576         gb_len += ARRAY_SIZE(llcp_magic);
 577
 578         if (gb_len > NFC_MAX_GT_LEN) {
 579                 ret = -EINVAL;
 580                 goto out;
 581         }
 582
 583         gb_cur = local->gb;
 584
 585         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 586         gb_cur += ARRAY_SIZE(llcp_magic);
 587
 588         memcpy(gb_cur, version_tlv, version_length);
 589         gb_cur += version_length;
 590
 591         memcpy(gb_cur, lto_tlv, lto_length);
 592         gb_cur += lto_length;
 593
 594         memcpy(gb_cur, wks_tlv, wks_length);
 595         gb_cur += wks_length;
 596
 597         memcpy(gb_cur, miux_tlv, miux_length);
 598         gb_cur += miux_length;
 599
 600         local->gb_len = gb_len;
 601
 602 out:
 603         kfree(version_tlv);
 604         kfree(lto_tlv);
 605         kfree(wks_tlv);
 606         kfree(miux_tlv);
 607
 608         return ret;
 609 }
 610
 611 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 612 {
 613         struct nfc_llcp_local *local;
 614
 615         local = nfc_llcp_find_local(dev);
 616         if (local == NULL) {
 617                 *general_bytes_len = 0;
 618                 return NULL;
 619         }
 620
 621         nfc_llcp_build_gb(local);
 622
 623         *general_bytes_len = local->gb_len;
 624
 625         return local->gb;
 626 }
 627
 628 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 629 {
 630         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
 631
 632         if (local == NULL) {
 633                 pr_err("No LLCP device\n");
 634                 return -ENODEV;
 635         }
 636         if (gb_len < 3)
 637                 return -EINVAL;
 638
 639         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 640         memcpy(local->remote_gb, gb, gb_len);
 641         local->remote_gb_len = gb_len;
 642
 643         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 644                 pr_err("MAC does not support LLCP\n");
 645                 return -EINVAL;
 646         }
 647
 648         return nfc_llcp_parse_gb_tlv(local,
 649                                      &local->remote_gb[3],
 650                                      local->remote_gb_len - 3);
 651 }
 652
 653 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
 654 {
 655         return (pdu->data[0] & 0xfc) >> 2;
 656 }
 657
 658 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
 659 {
 660         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 661 }
 662
 663 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
 664 {
 665         return pdu->data[1] & 0x3f;
 666 }
 667
 668 static u8 nfc_llcp_ns(struct sk_buff *pdu)
 669 {
 670         return pdu->data[2] >> 4;
 671 }
 672
 673 static u8 nfc_llcp_nr(struct sk_buff *pdu)
 674 {
 675         return pdu->data[2] & 0xf;
 676 }
 677
 678 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 679 {
 680         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 681         sock->send_n = (sock->send_n + 1) % 16;
 682         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 683 }
 684
 685 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 686                                struct sk_buff *skb, u8 direction)
 687 {
 688         struct sk_buff *skb_copy = NULL, *nskb;
 689         struct sock *sk;
 690         u8 *data;
 691
 692         read_lock(&local->raw_sockets.lock);
 693
 694         sk_for_each(sk, &local->raw_sockets.head) {
 695                 if (sk->sk_state != LLCP_BOUND)
 696                         continue;
 697
 698                 if (skb_copy == NULL) {
 699                         skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
 700                                                GFP_ATOMIC);
 701
 702                         if (skb_copy == NULL)
 703                                 continue;
 704
 705                         data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
 706
 707                         data[0] = local->dev ? local->dev->idx : 0xFF;
 708                         data[1] = direction;
 709                 }
 710
 711                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 712                 if (!nskb)
 713                         continue;
 714
 715                 if (sock_queue_rcv_skb(sk, nskb))
 716                         kfree_skb(nskb);
 717         }
 718
 719         read_unlock(&local->raw_sockets.lock);
 720
 721         kfree_skb(skb_copy);
 722 }
 723
 724 static void nfc_llcp_tx_work(struct work_struct *work)
 725 {
 726         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 727                                                     tx_work);
 728         struct sk_buff *skb;
 729         struct sock *sk;
 730         struct nfc_llcp_sock *llcp_sock;
 731
 732         skb = skb_dequeue(&local->tx_queue);
 733         if (skb != NULL) {
 734                 sk = skb->sk;
 735                 llcp_sock = nfc_llcp_sock(sk);
 736
 737                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 738                         nfc_llcp_send_symm(local->dev);
 739                 } else {
 740                         struct sk_buff *copy_skb = NULL;
 741                         u8 ptype = nfc_llcp_ptype(skb);
 742                         int ret;
 743
 744                         pr_debug("Sending pending skb\n");
 745                         print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
 746                                        DUMP_PREFIX_OFFSET, 16, 1,
 747                                        skb->data, skb->len, true);
 748
 749                         if (ptype == LLCP_PDU_I)
 750                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 751
 752                         __net_timestamp(skb);
 753
 754                         nfc_llcp_send_to_raw_sock(local, skb,
 755                                                   NFC_LLCP_DIRECTION_TX);
 756
 757                         ret = nfc_data_exchange(local->dev, local->target_idx,
 758                                                 skb, nfc_llcp_recv, local);
 759
 760                         if (ret) {
 761                                 kfree_skb(copy_skb);
 762                                 goto out;
 763                         }
 764
 765                         if (ptype == LLCP_PDU_I && copy_skb)
 766                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 767                                                copy_skb);
 768                 }
 769         } else {
 770                 nfc_llcp_send_symm(local->dev);
 771         }
 772
 773 out:
 774         mod_timer(&local->link_timer,
 775                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 776 }
 777
 778 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 779                                                           u8 ssap)
 780 {
 781         struct sock *sk;
 782         struct nfc_llcp_sock *llcp_sock;
 783
 784         read_lock(&local->connecting_sockets.lock);
 785
 786         sk_for_each(sk, &local->connecting_sockets.head) {
 787                 llcp_sock = nfc_llcp_sock(sk);
 788
 789                 if (llcp_sock->ssap == ssap) {
 790                         sock_hold(&llcp_sock->sk);
 791                         goto out;
 792                 }
 793         }
 794
 795         llcp_sock = NULL;
 796
 797 out:
 798         read_unlock(&local->connecting_sockets.lock);
 799
 800         return llcp_sock;
 801 }
 802
 803 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 804                                                   u8 *sn, size_t sn_len)
 805 {
 806         struct nfc_llcp_sock *llcp_sock;
 807
 808         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 809
 810         if (llcp_sock == NULL)
 811                 return NULL;
 812
 813         sock_hold(&llcp_sock->sk);
 814
 815         return llcp_sock;
 816 }
 817
 818 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
 819 {
 820         u8 *tlv = &skb->data[2], type, length;
 821         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 822
 823         while (offset < tlv_array_len) {
 824                 type = tlv[0];
 825                 length = tlv[1];
 826
 827                 pr_debug("type 0x%x length %d\n", type, length);
 828
 829                 if (type == LLCP_TLV_SN) {
 830                         *sn_len = length;
 831                         return &tlv[2];
 832                 }
 833
 834                 offset += length + 2;
 835                 tlv += length + 2;
 836         }
 837
 838         return NULL;
 839 }
 840
 841 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 842                              struct sk_buff *skb)
 843 {
 844         struct nfc_llcp_sock *llcp_sock;
 845         struct nfc_llcp_ui_cb *ui_cb;
 846         u8 dsap, ssap;
 847
 848         dsap = nfc_llcp_dsap(skb);
 849         ssap = nfc_llcp_ssap(skb);
 850
 851         ui_cb = nfc_llcp_ui_skb_cb(skb);
 852         ui_cb->dsap = dsap;
 853         ui_cb->ssap = ssap;
 854
 855         pr_debug("%d %d\n", dsap, ssap);
 856
 857         /* We're looking for a bound socket, not a client one */
 858         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 859         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 860                 return;
 861
 862         /* There is no sequence with UI frames */
 863         skb_pull(skb, LLCP_HEADER_SIZE);
 864         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 865                 /*
 866                  * UI frames will be freed from the socket layer, so we
 867                  * need to keep them alive until someone receives them.
 868                  */
 869                 skb_get(skb);
 870         } else {
 871                 pr_err("Receive queue is full\n");
 872                 kfree_skb(skb);
 873         }
 874
 875         nfc_llcp_sock_put(llcp_sock);
 876 }
 877
 878 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 879                                   struct sk_buff *skb)
 880 {
 881         struct sock *new_sk, *parent;
 882         struct nfc_llcp_sock *sock, *new_sock;
 883         u8 dsap, ssap, reason;
 884
 885         dsap = nfc_llcp_dsap(skb);
 886         ssap = nfc_llcp_ssap(skb);
 887
 888         pr_debug("%d %d\n", dsap, ssap);
 889
 890         if (dsap != LLCP_SAP_SDP) {
 891                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 892                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 893                         reason = LLCP_DM_NOBOUND;
 894                         goto fail;
 895                 }
 896         } else {
 897                 u8 *sn;
 898                 size_t sn_len;
 899
 900                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 901                 if (sn == NULL) {
 902                         reason = LLCP_DM_NOBOUND;
 903                         goto fail;
 904                 }
 905
 906                 pr_debug("Service name length %zu\n", sn_len);
 907
 908                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 909                 if (sock == NULL) {
 910                         reason = LLCP_DM_NOBOUND;
 911                         goto fail;
 912                 }
 913         }
 914
 915         lock_sock(&sock->sk);
 916
 917         parent = &sock->sk;
 918
 919         if (sk_acceptq_is_full(parent)) {
 920                 reason = LLCP_DM_REJ;
 921                 release_sock(&sock->sk);
 922                 sock_put(&sock->sk);
 923                 goto fail;
 924         }
 925
 926         if (sock->ssap == LLCP_SDP_UNBOUND) {
 927                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 928
 929                 pr_debug("First client, reserving %d\n", ssap);
 930
 931                 if (ssap == LLCP_SAP_MAX) {
 932                         reason = LLCP_DM_REJ;
 933                         release_sock(&sock->sk);
 934                         sock_put(&sock->sk);
 935                         goto fail;
 936                 }
 937
 938                 sock->ssap = ssap;
 939         }
 940
 941         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
 942         if (new_sk == NULL) {
 943                 reason = LLCP_DM_REJ;
 944                 release_sock(&sock->sk);
 945                 sock_put(&sock->sk);
 946                 goto fail;
 947         }
 948
 949         new_sock = nfc_llcp_sock(new_sk);
 950         new_sock->dev = local->dev;
 951         new_sock->local = nfc_llcp_local_get(local);
 952         new_sock->rw = sock->rw;
 953         new_sock->miux = sock->miux;
 954         new_sock->remote_miu = local->remote_miu;
 955         new_sock->nfc_protocol = sock->nfc_protocol;
 956         new_sock->dsap = ssap;
 957         new_sock->target_idx = local->target_idx;
 958         new_sock->parent = parent;
 959         new_sock->ssap = sock->ssap;
 960         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 961                 atomic_t *client_count;
 962
 963                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 964
 965                 client_count =
 966                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 967
 968                 atomic_inc(client_count);
 969                 new_sock->reserved_ssap = sock->ssap;
 970         }
 971
 972         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 973                                       skb->len - LLCP_HEADER_SIZE);
 974
 975         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 976
 977         nfc_llcp_sock_link(&local->sockets, new_sk);
 978
 979         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 980
 981         nfc_get_device(local->dev->idx);
 982
 983         new_sk->sk_state = LLCP_CONNECTED;
 984
 985         /* Wake the listening processes */
 986         parent->sk_data_ready(parent, 0);
 987
 988         /* Send CC */
 989         nfc_llcp_send_cc(new_sock);
 990
 991         release_sock(&sock->sk);
 992         sock_put(&sock->sk);
 993
 994         return;
 995
 996 fail:
 997         /* Send DM */
 998         nfc_llcp_send_dm(local, dsap, ssap, reason);
 999 }
1000
1001 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1002 {
1003         int nr_frames = 0;
1004         struct nfc_llcp_local *local = sock->local;
1005
1006         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1007                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1008                  sock->remote_rw);
1009
1010         /* Try to queue some I frames for transmission */
1011         while (sock->remote_ready &&
1012                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1013                 struct sk_buff *pdu;
1014
1015                 pdu = skb_dequeue(&sock->tx_queue);
1016                 if (pdu == NULL)
1017                         break;
1018
1019                 /* Update N(S)/N(R) */
1020                 nfc_llcp_set_nrns(sock, pdu);
1021
1022                 skb_queue_tail(&local->tx_queue, pdu);
1023                 nr_frames++;
1024         }
1025
1026         return nr_frames;
1027 }
1028
1029 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1030                                struct sk_buff *skb)
1031 {
1032         struct nfc_llcp_sock *llcp_sock;
1033         struct sock *sk;
1034         u8 dsap, ssap, ptype, ns, nr;
1035
1036         ptype = nfc_llcp_ptype(skb);
1037         dsap = nfc_llcp_dsap(skb);
1038         ssap = nfc_llcp_ssap(skb);
1039         ns = nfc_llcp_ns(skb);
1040         nr = nfc_llcp_nr(skb);
1041
1042         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1043
1044         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1045         if (llcp_sock == NULL) {
1046                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1047                 return;
1048         }
1049
1050         sk = &llcp_sock->sk;
1051         lock_sock(sk);
1052         if (sk->sk_state == LLCP_CLOSED) {
1053                 release_sock(sk);
1054                 nfc_llcp_sock_put(llcp_sock);
1055         }
1056
1057         /* Pass the payload upstream */
1058         if (ptype == LLCP_PDU_I) {
1059                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1060
1061                 if (ns == llcp_sock->recv_n)
1062                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1063                 else
1064                         pr_err("Received out of sequence I PDU\n");
1065
1066                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1067                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1068                         /*
1069                          * I frames will be freed from the socket layer, so we
1070                          * need to keep them alive until someone receives them.
1071                          */
1072                         skb_get(skb);
1073                 } else {
1074                         pr_err("Receive queue is full\n");
1075                         kfree_skb(skb);
1076                 }
1077         }
1078
1079         /* Remove skbs from the pending queue */
1080         if (llcp_sock->send_ack_n != nr) {
1081                 struct sk_buff *s, *tmp;
1082                 u8 n;
1083
1084                 llcp_sock->send_ack_n = nr;
1085
1086                 /* Remove and free all skbs until ns == nr */
1087                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1088                         n = nfc_llcp_ns(s);
1089
1090                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1091                         kfree_skb(s);
1092
1093                         if (n == nr)
1094                                 break;
1095                 }
1096
1097                 /* Re-queue the remaining skbs for transmission */
1098                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1099                                             s, tmp) {
1100                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1101                         skb_queue_head(&local->tx_queue, s);
1102                 }
1103         }
1104
1105         if (ptype == LLCP_PDU_RR)
1106                 llcp_sock->remote_ready = true;
1107         else if (ptype == LLCP_PDU_RNR)
1108                 llcp_sock->remote_ready = false;
1109
1110         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1111                 nfc_llcp_send_rr(llcp_sock);
1112
1113         release_sock(sk);
1114         nfc_llcp_sock_put(llcp_sock);
1115 }
1116
1117 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1118                                struct sk_buff *skb)
1119 {
1120         struct nfc_llcp_sock *llcp_sock;
1121         struct sock *sk;
1122         u8 dsap, ssap;
1123
1124         dsap = nfc_llcp_dsap(skb);
1125         ssap = nfc_llcp_ssap(skb);
1126
1127         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1128         if (llcp_sock == NULL) {
1129                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1130                 return;
1131         }
1132
1133         sk = &llcp_sock->sk;
1134         lock_sock(sk);
1135
1136         nfc_llcp_socket_purge(llcp_sock);
1137
1138         if (sk->sk_state == LLCP_CLOSED) {
1139                 release_sock(sk);
1140                 nfc_llcp_sock_put(llcp_sock);
1141         }
1142
1143         if (sk->sk_state == LLCP_CONNECTED) {
1144                 nfc_put_device(local->dev);
1145                 sk->sk_state = LLCP_CLOSED;
1146                 sk->sk_state_change(sk);
1147         }
1148
1149         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1150
1151         release_sock(sk);
1152         nfc_llcp_sock_put(llcp_sock);
1153 }
1154
1155 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1156 {
1157         struct nfc_llcp_sock *llcp_sock;
1158         struct sock *sk;
1159         u8 dsap, ssap;
1160
1161         dsap = nfc_llcp_dsap(skb);
1162         ssap = nfc_llcp_ssap(skb);
1163
1164         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1165         if (llcp_sock == NULL) {
1166                 pr_err("Invalid CC\n");
1167                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1168
1169                 return;
1170         }
1171
1172         sk = &llcp_sock->sk;
1173
1174         /* Unlink from connecting and link to the client array */
1175         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1176         nfc_llcp_sock_link(&local->sockets, sk);
1177         llcp_sock->dsap = ssap;
1178
1179         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1180                                       skb->len - LLCP_HEADER_SIZE);
1181
1182         sk->sk_state = LLCP_CONNECTED;
1183         sk->sk_state_change(sk);
1184
1185         nfc_llcp_sock_put(llcp_sock);
1186 }
1187
1188 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1189 {
1190         struct nfc_llcp_sock *llcp_sock;
1191         struct sock *sk;
1192         u8 dsap, ssap, reason;
1193
1194         dsap = nfc_llcp_dsap(skb);
1195         ssap = nfc_llcp_ssap(skb);
1196         reason = skb->data[2];
1197
1198         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1199
1200         switch (reason) {
1201         case LLCP_DM_NOBOUND:
1202         case LLCP_DM_REJ:
1203                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1204                 break;
1205
1206         default:
1207                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1208                 break;
1209         }
1210
1211         if (llcp_sock == NULL) {
1212                 pr_debug("Already closed\n");
1213                 return;
1214         }
1215
1216         sk = &llcp_sock->sk;
1217
1218         sk->sk_err = ENXIO;
1219         sk->sk_state = LLCP_CLOSED;
1220         sk->sk_state_change(sk);
1221
1222         nfc_llcp_sock_put(llcp_sock);
1223 }
1224
1225 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1226                               struct sk_buff *skb)
1227 {
1228         struct nfc_llcp_sock *llcp_sock;
1229         u8 dsap, ssap, *tlv, type, length, tid, sap;
1230         u16 tlv_len, offset;
1231         char *service_name;
1232         size_t service_name_len;
1233         struct nfc_llcp_sdp_tlv *sdp;
1234         HLIST_HEAD(llc_sdres_list);
1235         size_t sdres_tlvs_len;
1236         HLIST_HEAD(nl_sdres_list);
1237
1238         dsap = nfc_llcp_dsap(skb);
1239         ssap = nfc_llcp_ssap(skb);
1240
1241         pr_debug("%d %d\n", dsap, ssap);
1242
1243         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1244                 pr_err("Wrong SNL SAP\n");
1245                 return;
1246         }
1247
1248         tlv = &skb->data[LLCP_HEADER_SIZE];
1249         tlv_len = skb->len - LLCP_HEADER_SIZE;
1250         offset = 0;
1251         sdres_tlvs_len = 0;
1252
1253         while (offset < tlv_len) {
1254                 type = tlv[0];
1255                 length = tlv[1];
1256
1257                 switch (type) {
1258                 case LLCP_TLV_SDREQ:
1259                         tid = tlv[2];
1260                         service_name = (char *) &tlv[3];
1261                         service_name_len = length - 1;
1262
1263                         pr_debug("Looking for %.16s\n", service_name);
1264
1265                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1266                             !strncmp(service_name, "urn:nfc:sn:sdp",
1267                                      service_name_len)) {
1268                                 sap = 1;
1269                                 goto add_snl;
1270                         }
1271
1272                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1273                                                           service_name_len);
1274                         if (!llcp_sock) {
1275                                 sap = 0;
1276                                 goto add_snl;
1277                         }
1278
1279                         /*
1280                          * We found a socket but its ssap has not been reserved
1281                          * yet. We need to assign it for good and send a reply.
1282                          * The ssap will be freed when the socket is closed.
1283                          */
1284                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1285                                 atomic_t *client_count;
1286
1287                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1288
1289                                 pr_debug("Reserving %d\n", sap);
1290
1291                                 if (sap == LLCP_SAP_MAX) {
1292                                         sap = 0;
1293                                         goto add_snl;
1294                                 }
1295
1296                                 client_count =
1297                                         &local->local_sdp_cnt[sap -
1298                                                               LLCP_WKS_NUM_SAP];
1299
1300                                 atomic_inc(client_count);
1301
1302                                 llcp_sock->ssap = sap;
1303                                 llcp_sock->reserved_ssap = sap;
1304                         } else {
1305                                 sap = llcp_sock->ssap;
1306                         }
1307
1308                         pr_debug("%p %d\n", llcp_sock, sap);
1309
1310 add_snl:
1311                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1312                         if (sdp == NULL)
1313                                 goto exit;
1314
1315                         sdres_tlvs_len += sdp->tlv_len;
1316                         hlist_add_head(&sdp->node, &llc_sdres_list);
1317                         break;
1318
1319                 case LLCP_TLV_SDRES:
1320                         mutex_lock(&local->sdreq_lock);
1321
1322                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1323
1324                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1325                                 if (sdp->tid != tlv[2])
1326                                         continue;
1327
1328                                 sdp->sap = tlv[3];
1329
1330                                 pr_debug("Found: uri=%s, sap=%d\n",
1331                                          sdp->uri, sdp->sap);
1332
1333                                 hlist_del(&sdp->node);
1334
1335                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1336
1337                                 break;
1338                         }
1339
1340                         mutex_unlock(&local->sdreq_lock);
1341                         break;
1342
1343                 default:
1344                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1345                         break;
1346                 }
1347
1348                 offset += length + 2;
1349                 tlv += length + 2;
1350         }
1351
1352 exit:
1353         if (!hlist_empty(&nl_sdres_list))
1354                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1355
1356         if (!hlist_empty(&llc_sdres_list))
1357                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1358 }
1359
1360 static void nfc_llcp_rx_work(struct work_struct *work)
1361 {
1362         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1363                                                     rx_work);
1364         u8 dsap, ssap, ptype;
1365         struct sk_buff *skb;
1366
1367         skb = local->rx_pending;
1368         if (skb == NULL) {
1369                 pr_debug("No pending SKB\n");
1370                 return;
1371         }
1372
1373         ptype = nfc_llcp_ptype(skb);
1374         dsap = nfc_llcp_dsap(skb);
1375         ssap = nfc_llcp_ssap(skb);
1376
1377         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1378
1379         if (ptype != LLCP_PDU_SYMM)
1380                 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1381                                16, 1, skb->data, skb->len, true);
1382
1383         __net_timestamp(skb);
1384
1385         nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1386
1387         switch (ptype) {
1388         case LLCP_PDU_SYMM:
1389                 pr_debug("SYMM\n");
1390                 break;
1391
1392         case LLCP_PDU_UI:
1393                 pr_debug("UI\n");
1394                 nfc_llcp_recv_ui(local, skb);
1395                 break;
1396
1397         case LLCP_PDU_CONNECT:
1398                 pr_debug("CONNECT\n");
1399                 nfc_llcp_recv_connect(local, skb);
1400                 break;
1401
1402         case LLCP_PDU_DISC:
1403                 pr_debug("DISC\n");
1404                 nfc_llcp_recv_disc(local, skb);
1405                 break;
1406
1407         case LLCP_PDU_CC:
1408                 pr_debug("CC\n");
1409                 nfc_llcp_recv_cc(local, skb);
1410                 break;
1411
1412         case LLCP_PDU_DM:
1413                 pr_debug("DM\n");
1414                 nfc_llcp_recv_dm(local, skb);
1415                 break;
1416
1417         case LLCP_PDU_SNL:
1418                 pr_debug("SNL\n");
1419                 nfc_llcp_recv_snl(local, skb);
1420                 break;
1421
1422         case LLCP_PDU_I:
1423         case LLCP_PDU_RR:
1424         case LLCP_PDU_RNR:
1425                 pr_debug("I frame\n");
1426                 nfc_llcp_recv_hdlc(local, skb);
1427                 break;
1428
1429         }
1430
1431         schedule_work(&local->tx_work);
1432         kfree_skb(local->rx_pending);
1433         local->rx_pending = NULL;
1434 }
1435
1436 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1437 {
1438         local->rx_pending = skb;
1439         del_timer(&local->link_timer);
1440         schedule_work(&local->rx_work);
1441 }
1442
1443 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1444 {
1445         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1446
1447         pr_debug("Received an LLCP PDU\n");
1448         if (err < 0) {
1449                 pr_err("err %d\n", err);
1450                 return;
1451         }
1452
1453         __nfc_llcp_recv(local, skb);
1454 }
1455
1456 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1457 {
1458         struct nfc_llcp_local *local;
1459
1460         local = nfc_llcp_find_local(dev);
1461         if (local == NULL)
1462                 return -ENODEV;
1463
1464         __nfc_llcp_recv(local, skb);
1465
1466         return 0;
1467 }
1468
1469 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1470 {
1471         struct nfc_llcp_local *local;
1472
1473         local = nfc_llcp_find_local(dev);
1474         if (local == NULL)
1475                 return;
1476
1477         /* Close and purge all existing sockets */
1478         nfc_llcp_socket_release(local, true, 0);
1479 }
1480
1481 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1482                         u8 comm_mode, u8 rf_mode)
1483 {
1484         struct nfc_llcp_local *local;
1485
1486         pr_debug("rf mode %d\n", rf_mode);
1487
1488         local = nfc_llcp_find_local(dev);
1489         if (local == NULL)
1490                 return;
1491
1492         local->target_idx = target_idx;
1493         local->comm_mode = comm_mode;
1494         local->rf_mode = rf_mode;
1495
1496         if (rf_mode == NFC_RF_INITIATOR) {
1497                 pr_debug("Queueing Tx work\n");
1498
1499                 schedule_work(&local->tx_work);
1500         } else {
1501                 mod_timer(&local->link_timer,
1502                           jiffies + msecs_to_jiffies(local->remote_lto));
1503         }
1504 }
1505
1506 int nfc_llcp_register_device(struct nfc_dev *ndev)
1507 {
1508         struct nfc_llcp_local *local;
1509
1510         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1511         if (local == NULL)
1512                 return -ENOMEM;
1513
1514         local->dev = ndev;
1515         INIT_LIST_HEAD(&local->list);
1516         kref_init(&local->ref);
1517         mutex_init(&local->sdp_lock);
1518         init_timer(&local->link_timer);
1519         local->link_timer.data = (unsigned long) local;
1520         local->link_timer.function = nfc_llcp_symm_timer;
1521
1522         skb_queue_head_init(&local->tx_queue);
1523         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1524
1525         local->rx_pending = NULL;
1526         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1527
1528         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1529
1530         rwlock_init(&local->sockets.lock);
1531         rwlock_init(&local->connecting_sockets.lock);
1532         rwlock_init(&local->raw_sockets.lock);
1533
1534         local->lto = 150; /* 1500 ms */
1535         local->rw = LLCP_MAX_RW;
1536         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1537
1538         nfc_llcp_build_gb(local);
1539
1540         local->remote_miu = LLCP_DEFAULT_MIU;
1541         local->remote_lto = LLCP_DEFAULT_LTO;
1542
1543         mutex_init(&local->sdreq_lock);
1544         INIT_HLIST_HEAD(&local->pending_sdreqs);
1545         init_timer(&local->sdreq_timer);
1546         local->sdreq_timer.data = (unsigned long) local;
1547         local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1548         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1549
1550         list_add(&local->list, &llcp_devices);
1551
1552         return 0;
1553 }
1554
1555 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1556 {
1557         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1558
1559         if (local == NULL) {
1560                 pr_debug("No such device\n");
1561                 return;
1562         }
1563
1564         local_cleanup(local, false);
1565
1566         nfc_llcp_local_put(local);
1567 }
1568
1569 int __init nfc_llcp_init(void)
1570 {
1571         INIT_LIST_HEAD(&llcp_devices);
1572
1573         return nfc_llcp_sock_init();
1574 }
1575
1576 void nfc_llcp_exit(void)
1577 {
1578         nfc_llcp_sock_exit();
1579 }