net/nfc/llcp_core.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 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
  35
  36 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
  37 {
  38         write_lock(&l->lock);
  39         sk_add_node(sk, &l->head);
  40         write_unlock(&l->lock);
  41 }
  42
  43 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
  44 {
  45         write_lock(&l->lock);
  46         sk_del_node_init(sk);
  47         write_unlock(&l->lock);
  48 }
  49
  50 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
  51 {
  52         sock->remote_rw = LLCP_DEFAULT_RW;
  53         sock->remote_miu = LLCP_MAX_MIU + 1;
  54 }
  55
  56 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
  57 {
  58         struct nfc_llcp_local *local = sock->local;
  59         struct sk_buff *s, *tmp;
  60
  61         pr_debug("%p\n", &sock->sk);
  62
  63         skb_queue_purge(&sock->tx_queue);
  64         skb_queue_purge(&sock->tx_pending_queue);
  65
  66         if (local == NULL)
  67                 return;
  68
  69         /* Search for local pending SKBs that are related to this socket */
  70         skb_queue_walk_safe(&local->tx_queue, s, tmp) {
  71                 if (s->sk != &sock->sk)
  72                         continue;
  73
  74                 skb_unlink(s, &local->tx_queue);
  75                 kfree_skb(s);
  76         }
  77 }
  78
  79 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
  80                                     int err)
  81 {
  82         struct sock *sk;
  83         struct hlist_node *tmp;
  84         struct nfc_llcp_sock *llcp_sock;
  85
  86         skb_queue_purge(&local->tx_queue);
  87
  88         write_lock(&local->sockets.lock);
  89
  90         sk_for_each_safe(sk, tmp, &local->sockets.head) {
  91                 llcp_sock = nfc_llcp_sock(sk);
  92
  93                 bh_lock_sock(sk);
  94
  95                 nfc_llcp_socket_purge(llcp_sock);
  96
  97                 if (sk->sk_state == LLCP_CONNECTED)
  98                         nfc_put_device(llcp_sock->dev);
  99
 100                 if (sk->sk_state == LLCP_LISTEN) {
 101                         struct nfc_llcp_sock *lsk, *n;
 102                         struct sock *accept_sk;
 103
 104                         list_for_each_entry_safe(lsk, n,
 105                                                  &llcp_sock->accept_queue,
 106                                                  accept_queue) {
 107                                 accept_sk = &lsk->sk;
 108                                 bh_lock_sock(accept_sk);
 109
 110                                 nfc_llcp_accept_unlink(accept_sk);
 111
 112                                 if (err)
 113                                         accept_sk->sk_err = err;
 114                                 accept_sk->sk_state = LLCP_CLOSED;
 115                                 accept_sk->sk_state_change(sk);
 116
 117                                 bh_unlock_sock(accept_sk);
 118                         }
 119                 }
 120
 121                 if (err)
 122                         sk->sk_err = err;
 123                 sk->sk_state = LLCP_CLOSED;
 124                 sk->sk_state_change(sk);
 125
 126                 bh_unlock_sock(sk);
 127
 128                 sk_del_node_init(sk);
 129         }
 130
 131         write_unlock(&local->sockets.lock);
 132
 133         /* If we still have a device, we keep the RAW sockets alive */
 134         if (device == true)
 135                 return;
 136
 137         write_lock(&local->raw_sockets.lock);
 138
 139         sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
 140                 llcp_sock = nfc_llcp_sock(sk);
 141
 142                 bh_lock_sock(sk);
 143
 144                 nfc_llcp_socket_purge(llcp_sock);
 145
 146                 if (err)
 147                         sk->sk_err = err;
 148                 sk->sk_state = LLCP_CLOSED;
 149                 sk->sk_state_change(sk);
 150
 151                 bh_unlock_sock(sk);
 152
 153                 sk_del_node_init(sk);
 154         }
 155
 156         write_unlock(&local->raw_sockets.lock);
 157 }
 158
 159 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
 160 {
 161         kref_get(&local->ref);
 162
 163         return local;
 164 }
 165
 166 static void local_cleanup(struct nfc_llcp_local *local)
 167 {
 168         nfc_llcp_socket_release(local, false, ENXIO);
 169         del_timer_sync(&local->link_timer);
 170         skb_queue_purge(&local->tx_queue);
 171         cancel_work_sync(&local->tx_work);
 172         cancel_work_sync(&local->rx_work);
 173         cancel_work_sync(&local->timeout_work);
 174         kfree_skb(local->rx_pending);
 175         del_timer_sync(&local->sdreq_timer);
 176         cancel_work_sync(&local->sdreq_timeout_work);
 177         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
 178 }
 179
 180 static void local_release(struct kref *ref)
 181 {
 182         struct nfc_llcp_local *local;
 183
 184         local = container_of(ref, struct nfc_llcp_local, ref);
 185
 186         list_del(&local->list);
 187         local_cleanup(local);
 188         kfree(local);
 189 }
 190
 191 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 192 {
 193         if (local == NULL)
 194                 return 0;
 195
 196         return kref_put(&local->ref, local_release);
 197 }
 198
 199 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 200                                                u8 ssap, u8 dsap)
 201 {
 202         struct sock *sk;
 203         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 204
 205         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 206
 207         if (ssap == 0 && dsap == 0)
 208                 return NULL;
 209
 210         read_lock(&local->sockets.lock);
 211
 212         llcp_sock = NULL;
 213
 214         sk_for_each(sk, &local->sockets.head) {
 215                 tmp_sock = nfc_llcp_sock(sk);
 216
 217                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 218                         llcp_sock = tmp_sock;
 219                         break;
 220                 }
 221         }
 222
 223         read_unlock(&local->sockets.lock);
 224
 225         if (llcp_sock == NULL)
 226                 return NULL;
 227
 228         sock_hold(&llcp_sock->sk);
 229
 230         return llcp_sock;
 231 }
 232
 233 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 234 {
 235         sock_put(&sock->sk);
 236 }
 237
 238 static void nfc_llcp_timeout_work(struct work_struct *work)
 239 {
 240         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 241                                                     timeout_work);
 242
 243         nfc_dep_link_down(local->dev);
 244 }
 245
 246 static void nfc_llcp_symm_timer(unsigned long data)
 247 {
 248         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 249
 250         pr_err("SYMM timeout\n");
 251
 252         schedule_work(&local->timeout_work);
 253 }
 254
 255 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
 256 {
 257         unsigned long time;
 258         HLIST_HEAD(nl_sdres_list);
 259         struct hlist_node *n;
 260         struct nfc_llcp_sdp_tlv *sdp;
 261         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 262                                                     sdreq_timeout_work);
 263
 264         mutex_lock(&local->sdreq_lock);
 265
 266         time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
 267
 268         hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
 269                 if (time_after(sdp->time, time))
 270                         continue;
 271
 272                 sdp->sap = LLCP_SDP_UNBOUND;
 273
 274                 hlist_del(&sdp->node);
 275
 276                 hlist_add_head(&sdp->node, &nl_sdres_list);
 277         }
 278
 279         if (!hlist_empty(&local->pending_sdreqs))
 280                 mod_timer(&local->sdreq_timer,
 281                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
 282
 283         mutex_unlock(&local->sdreq_lock);
 284
 285         if (!hlist_empty(&nl_sdres_list))
 286                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
 287 }
 288
 289 static void nfc_llcp_sdreq_timer(unsigned long data)
 290 {
 291         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 292
 293         schedule_work(&local->sdreq_timeout_work);
 294 }
 295
 296 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 297 {
 298         struct nfc_llcp_local *local, *n;
 299
 300         list_for_each_entry_safe(local, n, &llcp_devices, list)
 301                 if (local->dev == dev)
 302                         return local;
 303
 304         pr_debug("No device found\n");
 305
 306         return NULL;
 307 }
 308
 309 static char *wks[] = {
 310         NULL,
 311         NULL, /* SDP */
 312         "urn:nfc:sn:ip",
 313         "urn:nfc:sn:obex",
 314         "urn:nfc:sn:snep",
 315 };
 316
 317 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
 318 {
 319         int sap, num_wks;
 320
 321         pr_debug("%s\n", service_name);
 322
 323         if (service_name == NULL)
 324                 return -EINVAL;
 325
 326         num_wks = ARRAY_SIZE(wks);
 327
 328         for (sap = 0; sap < num_wks; sap++) {
 329                 if (wks[sap] == NULL)
 330                         continue;
 331
 332                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 333                         return sap;
 334         }
 335
 336         return -EINVAL;
 337 }
 338
 339 static
 340 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 341                                             u8 *sn, size_t sn_len)
 342 {
 343         struct sock *sk;
 344         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 345
 346         pr_debug("sn %zd %p\n", sn_len, sn);
 347
 348         if (sn == NULL || sn_len == 0)
 349                 return NULL;
 350
 351         read_lock(&local->sockets.lock);
 352
 353         llcp_sock = NULL;
 354
 355         sk_for_each(sk, &local->sockets.head) {
 356                 tmp_sock = nfc_llcp_sock(sk);
 357
 358                 pr_debug("llcp sock %p\n", tmp_sock);
 359
 360                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 361                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 362                         continue;
 363
 364                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 365                     tmp_sock->sk.sk_state != LLCP_BOUND)
 366                         continue;
 367
 368                 if (tmp_sock->service_name == NULL ||
 369                     tmp_sock->service_name_len == 0)
 370                         continue;
 371
 372                 if (tmp_sock->service_name_len != sn_len)
 373                         continue;
 374
 375                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 376                         llcp_sock = tmp_sock;
 377                         break;
 378                 }
 379         }
 380
 381         read_unlock(&local->sockets.lock);
 382
 383         pr_debug("Found llcp sock %p\n", llcp_sock);
 384
 385         return llcp_sock;
 386 }
 387
 388 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 389                          struct nfc_llcp_sock *sock)
 390 {
 391         mutex_lock(&local->sdp_lock);
 392
 393         if (sock->service_name != NULL && sock->service_name_len > 0) {
 394                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 395                                             sock->service_name_len);
 396
 397                 if (ssap > 0) {
 398                         pr_debug("WKS %d\n", ssap);
 399
 400                         /* This is a WKS, let's check if it's free */
 401                         if (local->local_wks & BIT(ssap)) {
 402                                 mutex_unlock(&local->sdp_lock);
 403
 404                                 return LLCP_SAP_MAX;
 405                         }
 406
 407                         set_bit(ssap, &local->local_wks);
 408                         mutex_unlock(&local->sdp_lock);
 409
 410                         return ssap;
 411                 }
 412
 413                 /*
 414                  * Check if there already is a non WKS socket bound
 415                  * to this service name.
 416                  */
 417                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 418                                           sock->service_name_len) != NULL) {
 419                         mutex_unlock(&local->sdp_lock);
 420
 421                         return LLCP_SAP_MAX;
 422                 }
 423
 424                 mutex_unlock(&local->sdp_lock);
 425
 426                 return LLCP_SDP_UNBOUND;
 427
 428         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 429                 if (!test_bit(sock->ssap, &local->local_wks)) {
 430                         set_bit(sock->ssap, &local->local_wks);
 431                         mutex_unlock(&local->sdp_lock);
 432
 433                         return sock->ssap;
 434                 }
 435         }
 436
 437         mutex_unlock(&local->sdp_lock);
 438
 439         return LLCP_SAP_MAX;
 440 }
 441
 442 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 443 {
 444         u8 local_ssap;
 445
 446         mutex_lock(&local->sdp_lock);
 447
 448         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 449         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 450                 mutex_unlock(&local->sdp_lock);
 451                 return LLCP_SAP_MAX;
 452         }
 453
 454         set_bit(local_ssap, &local->local_sap);
 455
 456         mutex_unlock(&local->sdp_lock);
 457
 458         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 459 }
 460
 461 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 462 {
 463         u8 local_ssap;
 464         unsigned long *sdp;
 465
 466         if (ssap < LLCP_WKS_NUM_SAP) {
 467                 local_ssap = ssap;
 468                 sdp = &local->local_wks;
 469         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 470                 atomic_t *client_cnt;
 471
 472                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 473                 sdp = &local->local_sdp;
 474                 client_cnt = &local->local_sdp_cnt[local_ssap];
 475
 476                 pr_debug("%d clients\n", atomic_read(client_cnt));
 477
 478                 mutex_lock(&local->sdp_lock);
 479
 480                 if (atomic_dec_and_test(client_cnt)) {
 481                         struct nfc_llcp_sock *l_sock;
 482
 483                         pr_debug("No more clients for SAP %d\n", ssap);
 484
 485                         clear_bit(local_ssap, sdp);
 486
 487                         /* Find the listening sock and set it back to UNBOUND */
 488                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 489                         if (l_sock) {
 490                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 491                                 nfc_llcp_sock_put(l_sock);
 492                         }
 493                 }
 494
 495                 mutex_unlock(&local->sdp_lock);
 496
 497                 return;
 498         } else if (ssap < LLCP_MAX_SAP) {
 499                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 500                 sdp = &local->local_sap;
 501         } else {
 502                 return;
 503         }
 504
 505         mutex_lock(&local->sdp_lock);
 506
 507         clear_bit(local_ssap, sdp);
 508
 509         mutex_unlock(&local->sdp_lock);
 510 }
 511
 512 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 513 {
 514         u8 ssap;
 515
 516         mutex_lock(&local->sdp_lock);
 517
 518         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 519         if (ssap == LLCP_SDP_NUM_SAP) {
 520                 mutex_unlock(&local->sdp_lock);
 521
 522                 return LLCP_SAP_MAX;
 523         }
 524
 525         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 526
 527         set_bit(ssap, &local->local_sdp);
 528
 529         mutex_unlock(&local->sdp_lock);
 530
 531         return LLCP_WKS_NUM_SAP + ssap;
 532 }
 533
 534 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 535 {
 536         u8 *gb_cur, *version_tlv, version, version_length;
 537         u8 *lto_tlv, lto_length;
 538         u8 *wks_tlv, wks_length;
 539         u8 *miux_tlv, miux_length;
 540         u8 gb_len = 0;
 541         int ret = 0;
 542
 543         version = LLCP_VERSION_11;
 544         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 545                                          1, &version_length);
 546         gb_len += version_length;
 547
 548         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 549         gb_len += lto_length;
 550
 551         pr_debug("Local wks 0x%lx\n", local->local_wks);
 552         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
 553                                      &wks_length);
 554         gb_len += wks_length;
 555
 556         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 557                                       &miux_length);
 558         gb_len += miux_length;
 559
 560         gb_len += ARRAY_SIZE(llcp_magic);
 561
 562         if (gb_len > NFC_MAX_GT_LEN) {
 563                 ret = -EINVAL;
 564                 goto out;
 565         }
 566
 567         gb_cur = local->gb;
 568
 569         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 570         gb_cur += ARRAY_SIZE(llcp_magic);
 571
 572         memcpy(gb_cur, version_tlv, version_length);
 573         gb_cur += version_length;
 574
 575         memcpy(gb_cur, lto_tlv, lto_length);
 576         gb_cur += lto_length;
 577
 578         memcpy(gb_cur, wks_tlv, wks_length);
 579         gb_cur += wks_length;
 580
 581         memcpy(gb_cur, miux_tlv, miux_length);
 582         gb_cur += miux_length;
 583
 584         local->gb_len = gb_len;
 585
 586 out:
 587         kfree(version_tlv);
 588         kfree(lto_tlv);
 589         kfree(wks_tlv);
 590         kfree(miux_tlv);
 591
 592         return ret;
 593 }
 594
 595 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 596 {
 597         struct nfc_llcp_local *local;
 598
 599         local = nfc_llcp_find_local(dev);
 600         if (local == NULL) {
 601                 *general_bytes_len = 0;
 602                 return NULL;
 603         }
 604
 605         nfc_llcp_build_gb(local);
 606
 607         *general_bytes_len = local->gb_len;
 608
 609         return local->gb;
 610 }
 611
 612 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 613 {
 614         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
 615
 616         if (local == NULL) {
 617                 pr_err("No LLCP device\n");
 618                 return -ENODEV;
 619         }
 620         if (gb_len < 3)
 621                 return -EINVAL;
 622
 623         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 624         memcpy(local->remote_gb, gb, gb_len);
 625         local->remote_gb_len = gb_len;
 626
 627         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 628                 pr_err("MAC does not support LLCP\n");
 629                 return -EINVAL;
 630         }
 631
 632         return nfc_llcp_parse_gb_tlv(local,
 633                                      &local->remote_gb[3],
 634                                      local->remote_gb_len - 3);
 635 }
 636
 637 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
 638 {
 639         return (pdu->data[0] & 0xfc) >> 2;
 640 }
 641
 642 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
 643 {
 644         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 645 }
 646
 647 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
 648 {
 649         return pdu->data[1] & 0x3f;
 650 }
 651
 652 static u8 nfc_llcp_ns(struct sk_buff *pdu)
 653 {
 654         return pdu->data[2] >> 4;
 655 }
 656
 657 static u8 nfc_llcp_nr(struct sk_buff *pdu)
 658 {
 659         return pdu->data[2] & 0xf;
 660 }
 661
 662 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 663 {
 664         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 665         sock->send_n = (sock->send_n + 1) % 16;
 666         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 667 }
 668
 669 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 670                                struct sk_buff *skb, u8 direction)
 671 {
 672         struct sk_buff *skb_copy = NULL, *nskb;
 673         struct sock *sk;
 674         u8 *data;
 675
 676         read_lock(&local->raw_sockets.lock);
 677
 678         sk_for_each(sk, &local->raw_sockets.head) {
 679                 if (sk->sk_state != LLCP_BOUND)
 680                         continue;
 681
 682                 if (skb_copy == NULL) {
 683                         skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
 684                                                GFP_ATOMIC);
 685
 686                         if (skb_copy == NULL)
 687                                 continue;
 688
 689                         data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
 690
 691                         data[0] = local->dev ? local->dev->idx : 0xFF;
 692                         data[1] = direction;
 693                 }
 694
 695                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 696                 if (!nskb)
 697                         continue;
 698
 699                 if (sock_queue_rcv_skb(sk, nskb))
 700                         kfree_skb(nskb);
 701         }
 702
 703         read_unlock(&local->raw_sockets.lock);
 704
 705         kfree_skb(skb_copy);
 706 }
 707
 708 static void nfc_llcp_tx_work(struct work_struct *work)
 709 {
 710         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 711                                                     tx_work);
 712         struct sk_buff *skb;
 713         struct sock *sk;
 714         struct nfc_llcp_sock *llcp_sock;
 715
 716         skb = skb_dequeue(&local->tx_queue);
 717         if (skb != NULL) {
 718                 sk = skb->sk;
 719                 llcp_sock = nfc_llcp_sock(sk);
 720
 721                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 722                         nfc_llcp_send_symm(local->dev);
 723                 } else {
 724                         struct sk_buff *copy_skb = NULL;
 725                         u8 ptype = nfc_llcp_ptype(skb);
 726                         int ret;
 727
 728                         pr_debug("Sending pending skb\n");
 729                         print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
 730                                        DUMP_PREFIX_OFFSET, 16, 1,
 731                                        skb->data, skb->len, true);
 732
 733                         if (ptype == LLCP_PDU_I)
 734                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 735
 736                         __net_timestamp(skb);
 737
 738                         nfc_llcp_send_to_raw_sock(local, skb,
 739                                                   NFC_LLCP_DIRECTION_TX);
 740
 741                         ret = nfc_data_exchange(local->dev, local->target_idx,
 742                                                 skb, nfc_llcp_recv, local);
 743
 744                         if (ret) {
 745                                 kfree_skb(copy_skb);
 746                                 goto out;
 747                         }
 748
 749                         if (ptype == LLCP_PDU_I && copy_skb)
 750                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 751                                                copy_skb);
 752                 }
 753         } else {
 754                 nfc_llcp_send_symm(local->dev);
 755         }
 756
 757 out:
 758         mod_timer(&local->link_timer,
 759                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 760 }
 761
 762 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 763                                                           u8 ssap)
 764 {
 765         struct sock *sk;
 766         struct nfc_llcp_sock *llcp_sock;
 767
 768         read_lock(&local->connecting_sockets.lock);
 769
 770         sk_for_each(sk, &local->connecting_sockets.head) {
 771                 llcp_sock = nfc_llcp_sock(sk);
 772
 773                 if (llcp_sock->ssap == ssap) {
 774                         sock_hold(&llcp_sock->sk);
 775                         goto out;
 776                 }
 777         }
 778
 779         llcp_sock = NULL;
 780
 781 out:
 782         read_unlock(&local->connecting_sockets.lock);
 783
 784         return llcp_sock;
 785 }
 786
 787 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 788                                                   u8 *sn, size_t sn_len)
 789 {
 790         struct nfc_llcp_sock *llcp_sock;
 791
 792         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 793
 794         if (llcp_sock == NULL)
 795                 return NULL;
 796
 797         sock_hold(&llcp_sock->sk);
 798
 799         return llcp_sock;
 800 }
 801
 802 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
 803 {
 804         u8 *tlv = &skb->data[2], type, length;
 805         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 806
 807         while (offset < tlv_array_len) {
 808                 type = tlv[0];
 809                 length = tlv[1];
 810
 811                 pr_debug("type 0x%x length %d\n", type, length);
 812
 813                 if (type == LLCP_TLV_SN) {
 814                         *sn_len = length;
 815                         return &tlv[2];
 816                 }
 817
 818                 offset += length + 2;
 819                 tlv += length + 2;
 820         }
 821
 822         return NULL;
 823 }
 824
 825 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 826                              struct sk_buff *skb)
 827 {
 828         struct nfc_llcp_sock *llcp_sock;
 829         struct nfc_llcp_ui_cb *ui_cb;
 830         u8 dsap, ssap;
 831
 832         dsap = nfc_llcp_dsap(skb);
 833         ssap = nfc_llcp_ssap(skb);
 834
 835         ui_cb = nfc_llcp_ui_skb_cb(skb);
 836         ui_cb->dsap = dsap;
 837         ui_cb->ssap = ssap;
 838
 839         pr_debug("%d %d\n", dsap, ssap);
 840
 841         /* We're looking for a bound socket, not a client one */
 842         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 843         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 844                 return;
 845
 846         /* There is no sequence with UI frames */
 847         skb_pull(skb, LLCP_HEADER_SIZE);
 848         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 849                 /*
 850                  * UI frames will be freed from the socket layer, so we
 851                  * need to keep them alive until someone receives them.
 852                  */
 853                 skb_get(skb);
 854         } else {
 855                 pr_err("Receive queue is full\n");
 856         }
 857
 858         nfc_llcp_sock_put(llcp_sock);
 859 }
 860
 861 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 862                                   struct sk_buff *skb)
 863 {
 864         struct sock *new_sk, *parent;
 865         struct nfc_llcp_sock *sock, *new_sock;
 866         u8 dsap, ssap, reason;
 867
 868         dsap = nfc_llcp_dsap(skb);
 869         ssap = nfc_llcp_ssap(skb);
 870
 871         pr_debug("%d %d\n", dsap, ssap);
 872
 873         if (dsap != LLCP_SAP_SDP) {
 874                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 875                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 876                         reason = LLCP_DM_NOBOUND;
 877                         goto fail;
 878                 }
 879         } else {
 880                 u8 *sn;
 881                 size_t sn_len;
 882
 883                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 884                 if (sn == NULL) {
 885                         reason = LLCP_DM_NOBOUND;
 886                         goto fail;
 887                 }
 888
 889                 pr_debug("Service name length %zu\n", sn_len);
 890
 891                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 892                 if (sock == NULL) {
 893                         reason = LLCP_DM_NOBOUND;
 894                         goto fail;
 895                 }
 896         }
 897
 898         lock_sock(&sock->sk);
 899
 900         parent = &sock->sk;
 901
 902         if (sk_acceptq_is_full(parent)) {
 903                 reason = LLCP_DM_REJ;
 904                 release_sock(&sock->sk);
 905                 sock_put(&sock->sk);
 906                 goto fail;
 907         }
 908
 909         if (sock->ssap == LLCP_SDP_UNBOUND) {
 910                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 911
 912                 pr_debug("First client, reserving %d\n", ssap);
 913
 914                 if (ssap == LLCP_SAP_MAX) {
 915                         reason = LLCP_DM_REJ;
 916                         release_sock(&sock->sk);
 917                         sock_put(&sock->sk);
 918                         goto fail;
 919                 }
 920
 921                 sock->ssap = ssap;
 922         }
 923
 924         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
 925         if (new_sk == NULL) {
 926                 reason = LLCP_DM_REJ;
 927                 release_sock(&sock->sk);
 928                 sock_put(&sock->sk);
 929                 goto fail;
 930         }
 931
 932         new_sock = nfc_llcp_sock(new_sk);
 933         new_sock->dev = local->dev;
 934         new_sock->local = nfc_llcp_local_get(local);
 935         new_sock->rw = sock->rw;
 936         new_sock->miux = sock->miux;
 937         new_sock->remote_miu = local->remote_miu;
 938         new_sock->nfc_protocol = sock->nfc_protocol;
 939         new_sock->dsap = ssap;
 940         new_sock->target_idx = local->target_idx;
 941         new_sock->parent = parent;
 942         new_sock->ssap = sock->ssap;
 943         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 944                 atomic_t *client_count;
 945
 946                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 947
 948                 client_count =
 949                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 950
 951                 atomic_inc(client_count);
 952                 new_sock->reserved_ssap = sock->ssap;
 953         }
 954
 955         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 956                                       skb->len - LLCP_HEADER_SIZE);
 957
 958         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 959
 960         nfc_llcp_sock_link(&local->sockets, new_sk);
 961
 962         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 963
 964         nfc_get_device(local->dev->idx);
 965
 966         new_sk->sk_state = LLCP_CONNECTED;
 967
 968         /* Wake the listening processes */
 969         parent->sk_data_ready(parent, 0);
 970
 971         /* Send CC */
 972         nfc_llcp_send_cc(new_sock);
 973
 974         release_sock(&sock->sk);
 975         sock_put(&sock->sk);
 976
 977         return;
 978
 979 fail:
 980         /* Send DM */
 981         nfc_llcp_send_dm(local, dsap, ssap, reason);
 982 }
 983
 984 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
 985 {
 986         int nr_frames = 0;
 987         struct nfc_llcp_local *local = sock->local;
 988
 989         pr_debug("Remote ready %d tx queue len %d remote rw %d",
 990                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
 991                  sock->remote_rw);
 992
 993         /* Try to queue some I frames for transmission */
 994         while (sock->remote_ready &&
 995                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
 996                 struct sk_buff *pdu;
 997
 998                 pdu = skb_dequeue(&sock->tx_queue);
 999                 if (pdu == NULL)
1000                         break;
1001
1002                 /* Update N(S)/N(R) */
1003                 nfc_llcp_set_nrns(sock, pdu);
1004
1005                 skb_queue_tail(&local->tx_queue, pdu);
1006                 nr_frames++;
1007         }
1008
1009         return nr_frames;
1010 }
1011
1012 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1013                                struct sk_buff *skb)
1014 {
1015         struct nfc_llcp_sock *llcp_sock;
1016         struct sock *sk;
1017         u8 dsap, ssap, ptype, ns, nr;
1018
1019         ptype = nfc_llcp_ptype(skb);
1020         dsap = nfc_llcp_dsap(skb);
1021         ssap = nfc_llcp_ssap(skb);
1022         ns = nfc_llcp_ns(skb);
1023         nr = nfc_llcp_nr(skb);
1024
1025         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1026
1027         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1028         if (llcp_sock == NULL) {
1029                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1030                 return;
1031         }
1032
1033         sk = &llcp_sock->sk;
1034         lock_sock(sk);
1035         if (sk->sk_state == LLCP_CLOSED) {
1036                 release_sock(sk);
1037                 nfc_llcp_sock_put(llcp_sock);
1038         }
1039
1040         /* Pass the payload upstream */
1041         if (ptype == LLCP_PDU_I) {
1042                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1043
1044                 if (ns == llcp_sock->recv_n)
1045                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1046                 else
1047                         pr_err("Received out of sequence I PDU\n");
1048
1049                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1050                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1051                         /*
1052                          * I frames will be freed from the socket layer, so we
1053                          * need to keep them alive until someone receives them.
1054                          */
1055                         skb_get(skb);
1056                 } else {
1057                         pr_err("Receive queue is full\n");
1058                 }
1059         }
1060
1061         /* Remove skbs from the pending queue */
1062         if (llcp_sock->send_ack_n != nr) {
1063                 struct sk_buff *s, *tmp;
1064                 u8 n;
1065
1066                 llcp_sock->send_ack_n = nr;
1067
1068                 /* Remove and free all skbs until ns == nr */
1069                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1070                         n = nfc_llcp_ns(s);
1071
1072                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1073                         kfree_skb(s);
1074
1075                         if (n == nr)
1076                                 break;
1077                 }
1078
1079                 /* Re-queue the remaining skbs for transmission */
1080                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1081                                             s, tmp) {
1082                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1083                         skb_queue_head(&local->tx_queue, s);
1084                 }
1085         }
1086
1087         if (ptype == LLCP_PDU_RR)
1088                 llcp_sock->remote_ready = true;
1089         else if (ptype == LLCP_PDU_RNR)
1090                 llcp_sock->remote_ready = false;
1091
1092         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1093                 nfc_llcp_send_rr(llcp_sock);
1094
1095         release_sock(sk);
1096         nfc_llcp_sock_put(llcp_sock);
1097 }
1098
1099 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1100                                struct sk_buff *skb)
1101 {
1102         struct nfc_llcp_sock *llcp_sock;
1103         struct sock *sk;
1104         u8 dsap, ssap;
1105
1106         dsap = nfc_llcp_dsap(skb);
1107         ssap = nfc_llcp_ssap(skb);
1108
1109         if ((dsap == 0) && (ssap == 0)) {
1110                 pr_debug("Connection termination");
1111                 nfc_dep_link_down(local->dev);
1112                 return;
1113         }
1114
1115         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1116         if (llcp_sock == NULL) {
1117                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1118                 return;
1119         }
1120
1121         sk = &llcp_sock->sk;
1122         lock_sock(sk);
1123
1124         nfc_llcp_socket_purge(llcp_sock);
1125
1126         if (sk->sk_state == LLCP_CLOSED) {
1127                 release_sock(sk);
1128                 nfc_llcp_sock_put(llcp_sock);
1129         }
1130
1131         if (sk->sk_state == LLCP_CONNECTED) {
1132                 nfc_put_device(local->dev);
1133                 sk->sk_state = LLCP_CLOSED;
1134                 sk->sk_state_change(sk);
1135         }
1136
1137         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1138
1139         release_sock(sk);
1140         nfc_llcp_sock_put(llcp_sock);
1141 }
1142
1143 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1144 {
1145         struct nfc_llcp_sock *llcp_sock;
1146         struct sock *sk;
1147         u8 dsap, ssap;
1148
1149         dsap = nfc_llcp_dsap(skb);
1150         ssap = nfc_llcp_ssap(skb);
1151
1152         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1153         if (llcp_sock == NULL) {
1154                 pr_err("Invalid CC\n");
1155                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1156
1157                 return;
1158         }
1159
1160         sk = &llcp_sock->sk;
1161
1162         /* Unlink from connecting and link to the client array */
1163         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1164         nfc_llcp_sock_link(&local->sockets, sk);
1165         llcp_sock->dsap = ssap;
1166
1167         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1168                                       skb->len - LLCP_HEADER_SIZE);
1169
1170         sk->sk_state = LLCP_CONNECTED;
1171         sk->sk_state_change(sk);
1172
1173         nfc_llcp_sock_put(llcp_sock);
1174 }
1175
1176 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1177 {
1178         struct nfc_llcp_sock *llcp_sock;
1179         struct sock *sk;
1180         u8 dsap, ssap, reason;
1181
1182         dsap = nfc_llcp_dsap(skb);
1183         ssap = nfc_llcp_ssap(skb);
1184         reason = skb->data[2];
1185
1186         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1187
1188         switch (reason) {
1189         case LLCP_DM_NOBOUND:
1190         case LLCP_DM_REJ:
1191                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1192                 break;
1193
1194         default:
1195                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1196                 break;
1197         }
1198
1199         if (llcp_sock == NULL) {
1200                 pr_debug("Already closed\n");
1201                 return;
1202         }
1203
1204         sk = &llcp_sock->sk;
1205
1206         sk->sk_err = ENXIO;
1207         sk->sk_state = LLCP_CLOSED;
1208         sk->sk_state_change(sk);
1209
1210         nfc_llcp_sock_put(llcp_sock);
1211 }
1212
1213 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1214                               struct sk_buff *skb)
1215 {
1216         struct nfc_llcp_sock *llcp_sock;
1217         u8 dsap, ssap, *tlv, type, length, tid, sap;
1218         u16 tlv_len, offset;
1219         char *service_name;
1220         size_t service_name_len;
1221         struct nfc_llcp_sdp_tlv *sdp;
1222         HLIST_HEAD(llc_sdres_list);
1223         size_t sdres_tlvs_len;
1224         HLIST_HEAD(nl_sdres_list);
1225
1226         dsap = nfc_llcp_dsap(skb);
1227         ssap = nfc_llcp_ssap(skb);
1228
1229         pr_debug("%d %d\n", dsap, ssap);
1230
1231         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1232                 pr_err("Wrong SNL SAP\n");
1233                 return;
1234         }
1235
1236         tlv = &skb->data[LLCP_HEADER_SIZE];
1237         tlv_len = skb->len - LLCP_HEADER_SIZE;
1238         offset = 0;
1239         sdres_tlvs_len = 0;
1240
1241         while (offset < tlv_len) {
1242                 type = tlv[0];
1243                 length = tlv[1];
1244
1245                 switch (type) {
1246                 case LLCP_TLV_SDREQ:
1247                         tid = tlv[2];
1248                         service_name = (char *) &tlv[3];
1249                         service_name_len = length - 1;
1250
1251                         pr_debug("Looking for %.16s\n", service_name);
1252
1253                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1254                             !strncmp(service_name, "urn:nfc:sn:sdp",
1255                                      service_name_len)) {
1256                                 sap = 1;
1257                                 goto add_snl;
1258                         }
1259
1260                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1261                                                           service_name_len);
1262                         if (!llcp_sock) {
1263                                 sap = 0;
1264                                 goto add_snl;
1265                         }
1266
1267                         /*
1268                          * We found a socket but its ssap has not been reserved
1269                          * yet. We need to assign it for good and send a reply.
1270                          * The ssap will be freed when the socket is closed.
1271                          */
1272                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1273                                 atomic_t *client_count;
1274
1275                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1276
1277                                 pr_debug("Reserving %d\n", sap);
1278
1279                                 if (sap == LLCP_SAP_MAX) {
1280                                         sap = 0;
1281                                         goto add_snl;
1282                                 }
1283
1284                                 client_count =
1285                                         &local->local_sdp_cnt[sap -
1286                                                               LLCP_WKS_NUM_SAP];
1287
1288                                 atomic_inc(client_count);
1289
1290                                 llcp_sock->ssap = sap;
1291                                 llcp_sock->reserved_ssap = sap;
1292                         } else {
1293                                 sap = llcp_sock->ssap;
1294                         }
1295
1296                         pr_debug("%p %d\n", llcp_sock, sap);
1297
1298 add_snl:
1299                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1300                         if (sdp == NULL)
1301                                 goto exit;
1302
1303                         sdres_tlvs_len += sdp->tlv_len;
1304                         hlist_add_head(&sdp->node, &llc_sdres_list);
1305                         break;
1306
1307                 case LLCP_TLV_SDRES:
1308                         mutex_lock(&local->sdreq_lock);
1309
1310                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1311
1312                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1313                                 if (sdp->tid != tlv[2])
1314                                         continue;
1315
1316                                 sdp->sap = tlv[3];
1317
1318                                 pr_debug("Found: uri=%s, sap=%d\n",
1319                                          sdp->uri, sdp->sap);
1320
1321                                 hlist_del(&sdp->node);
1322
1323                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1324
1325                                 break;
1326                         }
1327
1328                         mutex_unlock(&local->sdreq_lock);
1329                         break;
1330
1331                 default:
1332                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1333                         break;
1334                 }
1335
1336                 offset += length + 2;
1337                 tlv += length + 2;
1338         }
1339
1340 exit:
1341         if (!hlist_empty(&nl_sdres_list))
1342                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1343
1344         if (!hlist_empty(&llc_sdres_list))
1345                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1346 }
1347
1348 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1349 {
1350         u8 ptype;
1351         u16 pdu_len;
1352         struct sk_buff *new_skb;
1353
1354         if (skb->len <= LLCP_HEADER_SIZE) {
1355                 pr_err("Malformed AGF PDU\n");
1356                 return;
1357         }
1358
1359         skb_pull(skb, LLCP_HEADER_SIZE);
1360
1361         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1362                 pdu_len = skb->data[0] << 8 | skb->data[1];
1363
1364                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1365
1366                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1367                         pr_err("Malformed AGF PDU\n");
1368                         return;
1369                 }
1370
1371                 ptype = nfc_llcp_ptype(skb);
1372
1373                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1374                         goto next;
1375
1376                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1377                 if (new_skb == NULL) {
1378                         pr_err("Could not allocate PDU\n");
1379                         return;
1380                 }
1381
1382                 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1383
1384                 nfc_llcp_rx_skb(local, new_skb);
1385
1386                 kfree_skb(new_skb);
1387 next:
1388                 skb_pull(skb, pdu_len);
1389         }
1390 }
1391
1392 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1393 {
1394         u8 dsap, ssap, ptype;
1395
1396         ptype = nfc_llcp_ptype(skb);
1397         dsap = nfc_llcp_dsap(skb);
1398         ssap = nfc_llcp_ssap(skb);
1399
1400         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1401
1402         if (ptype != LLCP_PDU_SYMM)
1403                 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1404                                16, 1, skb->data, skb->len, true);
1405
1406         switch (ptype) {
1407         case LLCP_PDU_SYMM:
1408                 pr_debug("SYMM\n");
1409                 break;
1410
1411         case LLCP_PDU_UI:
1412                 pr_debug("UI\n");
1413                 nfc_llcp_recv_ui(local, skb);
1414                 break;
1415
1416         case LLCP_PDU_CONNECT:
1417                 pr_debug("CONNECT\n");
1418                 nfc_llcp_recv_connect(local, skb);
1419                 break;
1420
1421         case LLCP_PDU_DISC:
1422                 pr_debug("DISC\n");
1423                 nfc_llcp_recv_disc(local, skb);
1424                 break;
1425
1426         case LLCP_PDU_CC:
1427                 pr_debug("CC\n");
1428                 nfc_llcp_recv_cc(local, skb);
1429                 break;
1430
1431         case LLCP_PDU_DM:
1432                 pr_debug("DM\n");
1433                 nfc_llcp_recv_dm(local, skb);
1434                 break;
1435
1436         case LLCP_PDU_SNL:
1437                 pr_debug("SNL\n");
1438                 nfc_llcp_recv_snl(local, skb);
1439                 break;
1440
1441         case LLCP_PDU_I:
1442         case LLCP_PDU_RR:
1443         case LLCP_PDU_RNR:
1444                 pr_debug("I frame\n");
1445                 nfc_llcp_recv_hdlc(local, skb);
1446                 break;
1447
1448         case LLCP_PDU_AGF:
1449                 pr_debug("AGF frame\n");
1450                 nfc_llcp_recv_agf(local, skb);
1451                 break;
1452         }
1453 }
1454
1455 static void nfc_llcp_rx_work(struct work_struct *work)
1456 {
1457         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1458                                                     rx_work);
1459         struct sk_buff *skb;
1460
1461         skb = local->rx_pending;
1462         if (skb == NULL) {
1463                 pr_debug("No pending SKB\n");
1464                 return;
1465         }
1466
1467         __net_timestamp(skb);
1468
1469         nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1470
1471         nfc_llcp_rx_skb(local, skb);
1472
1473         schedule_work(&local->tx_work);
1474         kfree_skb(local->rx_pending);
1475         local->rx_pending = NULL;
1476 }
1477
1478 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1479 {
1480         local->rx_pending = skb;
1481         del_timer(&local->link_timer);
1482         schedule_work(&local->rx_work);
1483 }
1484
1485 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1486 {
1487         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1488
1489         pr_debug("Received an LLCP PDU\n");
1490         if (err < 0) {
1491                 pr_err("err %d\n", err);
1492                 return;
1493         }
1494
1495         __nfc_llcp_recv(local, skb);
1496 }
1497
1498 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1499 {
1500         struct nfc_llcp_local *local;
1501
1502         local = nfc_llcp_find_local(dev);
1503         if (local == NULL)
1504                 return -ENODEV;
1505
1506         __nfc_llcp_recv(local, skb);
1507
1508         return 0;
1509 }
1510
1511 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1512 {
1513         struct nfc_llcp_local *local;
1514
1515         local = nfc_llcp_find_local(dev);
1516         if (local == NULL)
1517                 return;
1518
1519         local->remote_miu = LLCP_DEFAULT_MIU;
1520         local->remote_lto = LLCP_DEFAULT_LTO;
1521
1522         /* Close and purge all existing sockets */
1523         nfc_llcp_socket_release(local, true, 0);
1524 }
1525
1526 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1527                         u8 comm_mode, u8 rf_mode)
1528 {
1529         struct nfc_llcp_local *local;
1530
1531         pr_debug("rf mode %d\n", rf_mode);
1532
1533         local = nfc_llcp_find_local(dev);
1534         if (local == NULL)
1535                 return;
1536
1537         local->target_idx = target_idx;
1538         local->comm_mode = comm_mode;
1539         local->rf_mode = rf_mode;
1540
1541         if (rf_mode == NFC_RF_INITIATOR) {
1542                 pr_debug("Queueing Tx work\n");
1543
1544                 schedule_work(&local->tx_work);
1545         } else {
1546                 mod_timer(&local->link_timer,
1547                           jiffies + msecs_to_jiffies(local->remote_lto));
1548         }
1549 }
1550
1551 int nfc_llcp_register_device(struct nfc_dev *ndev)
1552 {
1553         struct nfc_llcp_local *local;
1554
1555         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1556         if (local == NULL)
1557                 return -ENOMEM;
1558
1559         local->dev = ndev;
1560         INIT_LIST_HEAD(&local->list);
1561         kref_init(&local->ref);
1562         mutex_init(&local->sdp_lock);
1563         init_timer(&local->link_timer);
1564         local->link_timer.data = (unsigned long) local;
1565         local->link_timer.function = nfc_llcp_symm_timer;
1566
1567         skb_queue_head_init(&local->tx_queue);
1568         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1569
1570         local->rx_pending = NULL;
1571         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1572
1573         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1574
1575         rwlock_init(&local->sockets.lock);
1576         rwlock_init(&local->connecting_sockets.lock);
1577         rwlock_init(&local->raw_sockets.lock);
1578
1579         local->lto = 150; /* 1500 ms */
1580         local->rw = LLCP_MAX_RW;
1581         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1582
1583         nfc_llcp_build_gb(local);
1584
1585         local->remote_miu = LLCP_DEFAULT_MIU;
1586         local->remote_lto = LLCP_DEFAULT_LTO;
1587
1588         mutex_init(&local->sdreq_lock);
1589         INIT_HLIST_HEAD(&local->pending_sdreqs);
1590         init_timer(&local->sdreq_timer);
1591         local->sdreq_timer.data = (unsigned long) local;
1592         local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1593         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1594
1595         list_add(&local->list, &llcp_devices);
1596
1597         return 0;
1598 }
1599
1600 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1601 {
1602         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1603
1604         if (local == NULL) {
1605                 pr_debug("No such device\n");
1606                 return;
1607         }
1608
1609         local_cleanup(local);
1610
1611         nfc_llcp_local_put(local);
1612 }
1613
1614 int __init nfc_llcp_init(void)
1615 {
1616         INIT_LIST_HEAD(&llcp_devices);
1617
1618         return nfc_llcp_sock_init();
1619 }
1620
1621 void nfc_llcp_exit(void)
1622 {
1623         nfc_llcp_sock_exit();
1624 }