net/nfc/llcp_core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2011  Intel Corporation. All rights reserved.
   4  * Copyright (C) 2014 Marvell International Ltd.
   5  */
   6
   7 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
   8
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/list.h>
  12 #include <linux/nfc.h>
  13
  14 #include "nfc.h"
  15 #include "llcp.h"
  16
  17 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
  18
  19 static LIST_HEAD(llcp_devices);
  20
  21 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
  22
  23 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
  24 {
  25         write_lock(&l->lock);
  26         sk_add_node(sk, &l->head);
  27         write_unlock(&l->lock);
  28 }
  29
  30 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
  31 {
  32         write_lock(&l->lock);
  33         sk_del_node_init(sk);
  34         write_unlock(&l->lock);
  35 }
  36
  37 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
  38 {
  39         sock->remote_rw = LLCP_DEFAULT_RW;
  40         sock->remote_miu = LLCP_MAX_MIU + 1;
  41 }
  42
  43 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
  44 {
  45         struct nfc_llcp_local *local = sock->local;
  46         struct sk_buff *s, *tmp;
  47
  48         pr_debug("%p\n", &sock->sk);
  49
  50         skb_queue_purge(&sock->tx_queue);
  51         skb_queue_purge(&sock->tx_pending_queue);
  52
  53         if (local == NULL)
  54                 return;
  55
  56         /* Search for local pending SKBs that are related to this socket */
  57         skb_queue_walk_safe(&local->tx_queue, s, tmp) {
  58                 if (s->sk != &sock->sk)
  59                         continue;
  60
  61                 skb_unlink(s, &local->tx_queue);
  62                 kfree_skb(s);
  63         }
  64 }
  65
  66 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
  67                                     int err)
  68 {
  69         struct sock *sk;
  70         struct hlist_node *tmp;
  71         struct nfc_llcp_sock *llcp_sock;
  72
  73         skb_queue_purge(&local->tx_queue);
  74
  75         write_lock(&local->sockets.lock);
  76
  77         sk_for_each_safe(sk, tmp, &local->sockets.head) {
  78                 llcp_sock = nfc_llcp_sock(sk);
  79
  80                 bh_lock_sock(sk);
  81
  82                 nfc_llcp_socket_purge(llcp_sock);
  83
  84                 if (sk->sk_state == LLCP_CONNECTED)
  85                         nfc_put_device(llcp_sock->dev);
  86
  87                 if (sk->sk_state == LLCP_LISTEN) {
  88                         struct nfc_llcp_sock *lsk, *n;
  89                         struct sock *accept_sk;
  90
  91                         list_for_each_entry_safe(lsk, n,
  92                                                  &llcp_sock->accept_queue,
  93                                                  accept_queue) {
  94                                 accept_sk = &lsk->sk;
  95                                 bh_lock_sock(accept_sk);
  96
  97                                 nfc_llcp_accept_unlink(accept_sk);
  98
  99                                 if (err)
 100                                         accept_sk->sk_err = err;
 101                                 accept_sk->sk_state = LLCP_CLOSED;
 102                                 accept_sk->sk_state_change(sk);
 103
 104                                 bh_unlock_sock(accept_sk);
 105                         }
 106                 }
 107
 108                 if (err)
 109                         sk->sk_err = err;
 110                 sk->sk_state = LLCP_CLOSED;
 111                 sk->sk_state_change(sk);
 112
 113                 bh_unlock_sock(sk);
 114
 115                 sk_del_node_init(sk);
 116         }
 117
 118         write_unlock(&local->sockets.lock);
 119
 120         /* If we still have a device, we keep the RAW sockets alive */
 121         if (device == true)
 122                 return;
 123
 124         write_lock(&local->raw_sockets.lock);
 125
 126         sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
 127                 llcp_sock = nfc_llcp_sock(sk);
 128
 129                 bh_lock_sock(sk);
 130
 131                 nfc_llcp_socket_purge(llcp_sock);
 132
 133                 if (err)
 134                         sk->sk_err = err;
 135                 sk->sk_state = LLCP_CLOSED;
 136                 sk->sk_state_change(sk);
 137
 138                 bh_unlock_sock(sk);
 139
 140                 sk_del_node_init(sk);
 141         }
 142
 143         write_unlock(&local->raw_sockets.lock);
 144 }
 145
 146 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
 147 {
 148         kref_get(&local->ref);
 149
 150         return local;
 151 }
 152
 153 static void local_cleanup(struct nfc_llcp_local *local)
 154 {
 155         nfc_llcp_socket_release(local, false, ENXIO);
 156         del_timer_sync(&local->link_timer);
 157         skb_queue_purge(&local->tx_queue);
 158         cancel_work_sync(&local->tx_work);
 159         cancel_work_sync(&local->rx_work);
 160         cancel_work_sync(&local->timeout_work);
 161         kfree_skb(local->rx_pending);
 162         del_timer_sync(&local->sdreq_timer);
 163         cancel_work_sync(&local->sdreq_timeout_work);
 164         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
 165 }
 166
 167 static void local_release(struct kref *ref)
 168 {
 169         struct nfc_llcp_local *local;
 170
 171         local = container_of(ref, struct nfc_llcp_local, ref);
 172
 173         list_del(&local->list);
 174         local_cleanup(local);
 175         kfree(local);
 176 }
 177
 178 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 179 {
 180         if (local == NULL)
 181                 return 0;
 182
 183         return kref_put(&local->ref, local_release);
 184 }
 185
 186 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 187                                                u8 ssap, u8 dsap)
 188 {
 189         struct sock *sk;
 190         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 191
 192         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 193
 194         if (ssap == 0 && dsap == 0)
 195                 return NULL;
 196
 197         read_lock(&local->sockets.lock);
 198
 199         llcp_sock = NULL;
 200
 201         sk_for_each(sk, &local->sockets.head) {
 202                 tmp_sock = nfc_llcp_sock(sk);
 203
 204                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 205                         llcp_sock = tmp_sock;
 206                         break;
 207                 }
 208         }
 209
 210         read_unlock(&local->sockets.lock);
 211
 212         if (llcp_sock == NULL)
 213                 return NULL;
 214
 215         sock_hold(&llcp_sock->sk);
 216
 217         return llcp_sock;
 218 }
 219
 220 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 221 {
 222         sock_put(&sock->sk);
 223 }
 224
 225 static void nfc_llcp_timeout_work(struct work_struct *work)
 226 {
 227         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 228                                                     timeout_work);
 229
 230         nfc_dep_link_down(local->dev);
 231 }
 232
 233 static void nfc_llcp_symm_timer(struct timer_list *t)
 234 {
 235         struct nfc_llcp_local *local = from_timer(local, t, link_timer);
 236
 237         pr_err("SYMM timeout\n");
 238
 239         schedule_work(&local->timeout_work);
 240 }
 241
 242 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
 243 {
 244         unsigned long time;
 245         HLIST_HEAD(nl_sdres_list);
 246         struct hlist_node *n;
 247         struct nfc_llcp_sdp_tlv *sdp;
 248         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 249                                                     sdreq_timeout_work);
 250
 251         mutex_lock(&local->sdreq_lock);
 252
 253         time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
 254
 255         hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
 256                 if (time_after(sdp->time, time))
 257                         continue;
 258
 259                 sdp->sap = LLCP_SDP_UNBOUND;
 260
 261                 hlist_del(&sdp->node);
 262
 263                 hlist_add_head(&sdp->node, &nl_sdres_list);
 264         }
 265
 266         if (!hlist_empty(&local->pending_sdreqs))
 267                 mod_timer(&local->sdreq_timer,
 268                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
 269
 270         mutex_unlock(&local->sdreq_lock);
 271
 272         if (!hlist_empty(&nl_sdres_list))
 273                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
 274 }
 275
 276 static void nfc_llcp_sdreq_timer(struct timer_list *t)
 277 {
 278         struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
 279
 280         schedule_work(&local->sdreq_timeout_work);
 281 }
 282
 283 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 284 {
 285         struct nfc_llcp_local *local;
 286
 287         list_for_each_entry(local, &llcp_devices, list)
 288                 if (local->dev == dev)
 289                         return local;
 290
 291         pr_debug("No device found\n");
 292
 293         return NULL;
 294 }
 295
 296 static char *wks[] = {
 297         NULL,
 298         NULL, /* SDP */
 299         "urn:nfc:sn:ip",
 300         "urn:nfc:sn:obex",
 301         "urn:nfc:sn:snep",
 302 };
 303
 304 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
 305 {
 306         int sap, num_wks;
 307
 308         pr_debug("%s\n", service_name);
 309
 310         if (service_name == NULL)
 311                 return -EINVAL;
 312
 313         num_wks = ARRAY_SIZE(wks);
 314
 315         for (sap = 0; sap < num_wks; sap++) {
 316                 if (wks[sap] == NULL)
 317                         continue;
 318
 319                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 320                         return sap;
 321         }
 322
 323         return -EINVAL;
 324 }
 325
 326 static
 327 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 328                                             const u8 *sn, size_t sn_len)
 329 {
 330         struct sock *sk;
 331         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 332
 333         pr_debug("sn %zd %p\n", sn_len, sn);
 334
 335         if (sn == NULL || sn_len == 0)
 336                 return NULL;
 337
 338         read_lock(&local->sockets.lock);
 339
 340         llcp_sock = NULL;
 341
 342         sk_for_each(sk, &local->sockets.head) {
 343                 tmp_sock = nfc_llcp_sock(sk);
 344
 345                 pr_debug("llcp sock %p\n", tmp_sock);
 346
 347                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 348                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 349                         continue;
 350
 351                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 352                     tmp_sock->sk.sk_state != LLCP_BOUND)
 353                         continue;
 354
 355                 if (tmp_sock->service_name == NULL ||
 356                     tmp_sock->service_name_len == 0)
 357                         continue;
 358
 359                 if (tmp_sock->service_name_len != sn_len)
 360                         continue;
 361
 362                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 363                         llcp_sock = tmp_sock;
 364                         break;
 365                 }
 366         }
 367
 368         read_unlock(&local->sockets.lock);
 369
 370         pr_debug("Found llcp sock %p\n", llcp_sock);
 371
 372         return llcp_sock;
 373 }
 374
 375 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 376                          struct nfc_llcp_sock *sock)
 377 {
 378         mutex_lock(&local->sdp_lock);
 379
 380         if (sock->service_name != NULL && sock->service_name_len > 0) {
 381                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 382                                             sock->service_name_len);
 383
 384                 if (ssap > 0) {
 385                         pr_debug("WKS %d\n", ssap);
 386
 387                         /* This is a WKS, let's check if it's free */
 388                         if (local->local_wks & BIT(ssap)) {
 389                                 mutex_unlock(&local->sdp_lock);
 390
 391                                 return LLCP_SAP_MAX;
 392                         }
 393
 394                         set_bit(ssap, &local->local_wks);
 395                         mutex_unlock(&local->sdp_lock);
 396
 397                         return ssap;
 398                 }
 399
 400                 /*
 401                  * Check if there already is a non WKS socket bound
 402                  * to this service name.
 403                  */
 404                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 405                                           sock->service_name_len) != NULL) {
 406                         mutex_unlock(&local->sdp_lock);
 407
 408                         return LLCP_SAP_MAX;
 409                 }
 410
 411                 mutex_unlock(&local->sdp_lock);
 412
 413                 return LLCP_SDP_UNBOUND;
 414
 415         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 416                 if (!test_bit(sock->ssap, &local->local_wks)) {
 417                         set_bit(sock->ssap, &local->local_wks);
 418                         mutex_unlock(&local->sdp_lock);
 419
 420                         return sock->ssap;
 421                 }
 422         }
 423
 424         mutex_unlock(&local->sdp_lock);
 425
 426         return LLCP_SAP_MAX;
 427 }
 428
 429 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 430 {
 431         u8 local_ssap;
 432
 433         mutex_lock(&local->sdp_lock);
 434
 435         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 436         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 437                 mutex_unlock(&local->sdp_lock);
 438                 return LLCP_SAP_MAX;
 439         }
 440
 441         set_bit(local_ssap, &local->local_sap);
 442
 443         mutex_unlock(&local->sdp_lock);
 444
 445         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 446 }
 447
 448 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 449 {
 450         u8 local_ssap;
 451         unsigned long *sdp;
 452
 453         if (ssap < LLCP_WKS_NUM_SAP) {
 454                 local_ssap = ssap;
 455                 sdp = &local->local_wks;
 456         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 457                 atomic_t *client_cnt;
 458
 459                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 460                 sdp = &local->local_sdp;
 461                 client_cnt = &local->local_sdp_cnt[local_ssap];
 462
 463                 pr_debug("%d clients\n", atomic_read(client_cnt));
 464
 465                 mutex_lock(&local->sdp_lock);
 466
 467                 if (atomic_dec_and_test(client_cnt)) {
 468                         struct nfc_llcp_sock *l_sock;
 469
 470                         pr_debug("No more clients for SAP %d\n", ssap);
 471
 472                         clear_bit(local_ssap, sdp);
 473
 474                         /* Find the listening sock and set it back to UNBOUND */
 475                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 476                         if (l_sock) {
 477                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 478                                 nfc_llcp_sock_put(l_sock);
 479                         }
 480                 }
 481
 482                 mutex_unlock(&local->sdp_lock);
 483
 484                 return;
 485         } else if (ssap < LLCP_MAX_SAP) {
 486                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 487                 sdp = &local->local_sap;
 488         } else {
 489                 return;
 490         }
 491
 492         mutex_lock(&local->sdp_lock);
 493
 494         clear_bit(local_ssap, sdp);
 495
 496         mutex_unlock(&local->sdp_lock);
 497 }
 498
 499 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 500 {
 501         u8 ssap;
 502
 503         mutex_lock(&local->sdp_lock);
 504
 505         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 506         if (ssap == LLCP_SDP_NUM_SAP) {
 507                 mutex_unlock(&local->sdp_lock);
 508
 509                 return LLCP_SAP_MAX;
 510         }
 511
 512         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 513
 514         set_bit(ssap, &local->local_sdp);
 515
 516         mutex_unlock(&local->sdp_lock);
 517
 518         return LLCP_WKS_NUM_SAP + ssap;
 519 }
 520
 521 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 522 {
 523         u8 *gb_cur, version, version_length;
 524         u8 lto_length, wks_length, miux_length;
 525         const u8 *version_tlv = NULL, *lto_tlv = NULL,
 526            *wks_tlv = NULL, *miux_tlv = NULL;
 527         __be16 wks = cpu_to_be16(local->local_wks);
 528         u8 gb_len = 0;
 529         int ret = 0;
 530
 531         version = LLCP_VERSION_11;
 532         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 533                                          1, &version_length);
 534         if (!version_tlv) {
 535                 ret = -ENOMEM;
 536                 goto out;
 537         }
 538         gb_len += version_length;
 539
 540         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 541         if (!lto_tlv) {
 542                 ret = -ENOMEM;
 543                 goto out;
 544         }
 545         gb_len += lto_length;
 546
 547         pr_debug("Local wks 0x%lx\n", local->local_wks);
 548         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
 549         if (!wks_tlv) {
 550                 ret = -ENOMEM;
 551                 goto out;
 552         }
 553         gb_len += wks_length;
 554
 555         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 556                                       &miux_length);
 557         if (!miux_tlv) {
 558                 ret = -ENOMEM;
 559                 goto out;
 560         }
 561         gb_len += miux_length;
 562
 563         gb_len += ARRAY_SIZE(llcp_magic);
 564
 565         if (gb_len > NFC_MAX_GT_LEN) {
 566                 ret = -EINVAL;
 567                 goto out;
 568         }
 569
 570         gb_cur = local->gb;
 571
 572         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 573         gb_cur += ARRAY_SIZE(llcp_magic);
 574
 575         memcpy(gb_cur, version_tlv, version_length);
 576         gb_cur += version_length;
 577
 578         memcpy(gb_cur, lto_tlv, lto_length);
 579         gb_cur += lto_length;
 580
 581         memcpy(gb_cur, wks_tlv, wks_length);
 582         gb_cur += wks_length;
 583
 584         memcpy(gb_cur, miux_tlv, miux_length);
 585         gb_cur += miux_length;
 586
 587         local->gb_len = gb_len;
 588
 589 out:
 590         kfree(version_tlv);
 591         kfree(lto_tlv);
 592         kfree(wks_tlv);
 593         kfree(miux_tlv);
 594
 595         return ret;
 596 }
 597
 598 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 599 {
 600         struct nfc_llcp_local *local;
 601
 602         local = nfc_llcp_find_local(dev);
 603         if (local == NULL) {
 604                 *general_bytes_len = 0;
 605                 return NULL;
 606         }
 607
 608         nfc_llcp_build_gb(local);
 609
 610         *general_bytes_len = local->gb_len;
 611
 612         return local->gb;
 613 }
 614
 615 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
 616 {
 617         struct nfc_llcp_local *local;
 618
 619         if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
 620                 return -EINVAL;
 621
 622         local = nfc_llcp_find_local(dev);
 623         if (local == NULL) {
 624                 pr_err("No LLCP device\n");
 625                 return -ENODEV;
 626         }
 627
 628         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 629         memcpy(local->remote_gb, gb, gb_len);
 630         local->remote_gb_len = gb_len;
 631
 632         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 633                 pr_err("MAC does not support LLCP\n");
 634                 return -EINVAL;
 635         }
 636
 637         return nfc_llcp_parse_gb_tlv(local,
 638                                      &local->remote_gb[3],
 639                                      local->remote_gb_len - 3);
 640 }
 641
 642 static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
 643 {
 644         return (pdu->data[0] & 0xfc) >> 2;
 645 }
 646
 647 static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
 648 {
 649         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 650 }
 651
 652 static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
 653 {
 654         return pdu->data[1] & 0x3f;
 655 }
 656
 657 static u8 nfc_llcp_ns(const struct sk_buff *pdu)
 658 {
 659         return pdu->data[2] >> 4;
 660 }
 661
 662 static u8 nfc_llcp_nr(const struct sk_buff *pdu)
 663 {
 664         return pdu->data[2] & 0xf;
 665 }
 666
 667 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 668 {
 669         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 670         sock->send_n = (sock->send_n + 1) % 16;
 671         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 672 }
 673
 674 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 675                                struct sk_buff *skb, u8 direction)
 676 {
 677         struct sk_buff *skb_copy = NULL, *nskb;
 678         struct sock *sk;
 679         u8 *data;
 680
 681         read_lock(&local->raw_sockets.lock);
 682
 683         sk_for_each(sk, &local->raw_sockets.head) {
 684                 if (sk->sk_state != LLCP_BOUND)
 685                         continue;
 686
 687                 if (skb_copy == NULL) {
 688                         skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
 689                                                       GFP_ATOMIC, true);
 690
 691                         if (skb_copy == NULL)
 692                                 continue;
 693
 694                         data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
 695
 696                         data[0] = local->dev ? local->dev->idx : 0xFF;
 697                         data[1] = direction & 0x01;
 698                         data[1] |= (RAW_PAYLOAD_LLCP << 1);
 699                 }
 700
 701                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 702                 if (!nskb)
 703                         continue;
 704
 705                 if (sock_queue_rcv_skb(sk, nskb))
 706                         kfree_skb(nskb);
 707         }
 708
 709         read_unlock(&local->raw_sockets.lock);
 710
 711         kfree_skb(skb_copy);
 712 }
 713
 714 static void nfc_llcp_tx_work(struct work_struct *work)
 715 {
 716         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 717                                                     tx_work);
 718         struct sk_buff *skb;
 719         struct sock *sk;
 720         struct nfc_llcp_sock *llcp_sock;
 721
 722         skb = skb_dequeue(&local->tx_queue);
 723         if (skb != NULL) {
 724                 sk = skb->sk;
 725                 llcp_sock = nfc_llcp_sock(sk);
 726
 727                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 728                         kfree_skb(skb);
 729                         nfc_llcp_send_symm(local->dev);
 730                 } else if (llcp_sock && !llcp_sock->remote_ready) {
 731                         skb_queue_head(&local->tx_queue, skb);
 732                         nfc_llcp_send_symm(local->dev);
 733                 } else {
 734                         struct sk_buff *copy_skb = NULL;
 735                         u8 ptype = nfc_llcp_ptype(skb);
 736                         int ret;
 737
 738                         pr_debug("Sending pending skb\n");
 739                         print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
 740                                              16, 1, skb->data, skb->len, true);
 741
 742                         if (ptype == LLCP_PDU_DISC && sk != NULL &&
 743                             sk->sk_state == LLCP_DISCONNECTING) {
 744                                 nfc_llcp_sock_unlink(&local->sockets, sk);
 745                                 sock_orphan(sk);
 746                                 sock_put(sk);
 747                         }
 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_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                                                   const 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 const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
 819 {
 820         u8 type, length;
 821         const u8 *tlv = &skb->data[2];
 822         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 823
 824         while (offset < tlv_array_len) {
 825                 type = tlv[0];
 826                 length = tlv[1];
 827
 828                 pr_debug("type 0x%x length %d\n", type, length);
 829
 830                 if (type == LLCP_TLV_SN) {
 831                         *sn_len = length;
 832                         return &tlv[2];
 833                 }
 834
 835                 offset += length + 2;
 836                 tlv += length + 2;
 837         }
 838
 839         return NULL;
 840 }
 841
 842 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 843                              struct sk_buff *skb)
 844 {
 845         struct nfc_llcp_sock *llcp_sock;
 846         struct nfc_llcp_ui_cb *ui_cb;
 847         u8 dsap, ssap;
 848
 849         dsap = nfc_llcp_dsap(skb);
 850         ssap = nfc_llcp_ssap(skb);
 851
 852         ui_cb = nfc_llcp_ui_skb_cb(skb);
 853         ui_cb->dsap = dsap;
 854         ui_cb->ssap = ssap;
 855
 856         pr_debug("%d %d\n", dsap, ssap);
 857
 858         /* We're looking for a bound socket, not a client one */
 859         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 860         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 861                 return;
 862
 863         /* There is no sequence with UI frames */
 864         skb_pull(skb, LLCP_HEADER_SIZE);
 865         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 866                 /*
 867                  * UI frames will be freed from the socket layer, so we
 868                  * need to keep them alive until someone receives them.
 869                  */
 870                 skb_get(skb);
 871         } else {
 872                 pr_err("Receive queue is full\n");
 873         }
 874
 875         nfc_llcp_sock_put(llcp_sock);
 876 }
 877
 878 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 879                                   const 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                 const 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, 0);
 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->nfc_protocol = sock->nfc_protocol;
 955         new_sock->dsap = ssap;
 956         new_sock->target_idx = local->target_idx;
 957         new_sock->parent = parent;
 958         new_sock->ssap = sock->ssap;
 959         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 960                 atomic_t *client_count;
 961
 962                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 963
 964                 client_count =
 965                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 966
 967                 atomic_inc(client_count);
 968                 new_sock->reserved_ssap = sock->ssap;
 969         }
 970
 971         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 972                                       skb->len - LLCP_HEADER_SIZE);
 973
 974         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 975
 976         nfc_llcp_sock_link(&local->sockets, new_sk);
 977
 978         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 979
 980         nfc_get_device(local->dev->idx);
 981
 982         new_sk->sk_state = LLCP_CONNECTED;
 983
 984         /* Wake the listening processes */
 985         parent->sk_data_ready(parent);
 986
 987         /* Send CC */
 988         nfc_llcp_send_cc(new_sock);
 989
 990         release_sock(&sock->sk);
 991         sock_put(&sock->sk);
 992
 993         return;
 994
 995 fail:
 996         /* Send DM */
 997         nfc_llcp_send_dm(local, dsap, ssap, reason);
 998 }
 999
1000 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1001 {
1002         int nr_frames = 0;
1003         struct nfc_llcp_local *local = sock->local;
1004
1005         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1006                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1007                  sock->remote_rw);
1008
1009         /* Try to queue some I frames for transmission */
1010         while (sock->remote_ready &&
1011                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1012                 struct sk_buff *pdu;
1013
1014                 pdu = skb_dequeue(&sock->tx_queue);
1015                 if (pdu == NULL)
1016                         break;
1017
1018                 /* Update N(S)/N(R) */
1019                 nfc_llcp_set_nrns(sock, pdu);
1020
1021                 skb_queue_tail(&local->tx_queue, pdu);
1022                 nr_frames++;
1023         }
1024
1025         return nr_frames;
1026 }
1027
1028 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1029                                struct sk_buff *skb)
1030 {
1031         struct nfc_llcp_sock *llcp_sock;
1032         struct sock *sk;
1033         u8 dsap, ssap, ptype, ns, nr;
1034
1035         ptype = nfc_llcp_ptype(skb);
1036         dsap = nfc_llcp_dsap(skb);
1037         ssap = nfc_llcp_ssap(skb);
1038         ns = nfc_llcp_ns(skb);
1039         nr = nfc_llcp_nr(skb);
1040
1041         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1042
1043         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1044         if (llcp_sock == NULL) {
1045                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1046                 return;
1047         }
1048
1049         sk = &llcp_sock->sk;
1050         lock_sock(sk);
1051         if (sk->sk_state == LLCP_CLOSED) {
1052                 release_sock(sk);
1053                 nfc_llcp_sock_put(llcp_sock);
1054         }
1055
1056         /* Pass the payload upstream */
1057         if (ptype == LLCP_PDU_I) {
1058                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1059
1060                 if (ns == llcp_sock->recv_n)
1061                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1062                 else
1063                         pr_err("Received out of sequence I PDU\n");
1064
1065                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1066                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1067                         /*
1068                          * I frames will be freed from the socket layer, so we
1069                          * need to keep them alive until someone receives them.
1070                          */
1071                         skb_get(skb);
1072                 } else {
1073                         pr_err("Receive queue is full\n");
1074                 }
1075         }
1076
1077         /* Remove skbs from the pending queue */
1078         if (llcp_sock->send_ack_n != nr) {
1079                 struct sk_buff *s, *tmp;
1080                 u8 n;
1081
1082                 llcp_sock->send_ack_n = nr;
1083
1084                 /* Remove and free all skbs until ns == nr */
1085                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1086                         n = nfc_llcp_ns(s);
1087
1088                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1089                         kfree_skb(s);
1090
1091                         if (n == nr)
1092                                 break;
1093                 }
1094
1095                 /* Re-queue the remaining skbs for transmission */
1096                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1097                                             s, tmp) {
1098                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1099                         skb_queue_head(&local->tx_queue, s);
1100                 }
1101         }
1102
1103         if (ptype == LLCP_PDU_RR)
1104                 llcp_sock->remote_ready = true;
1105         else if (ptype == LLCP_PDU_RNR)
1106                 llcp_sock->remote_ready = false;
1107
1108         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1109                 nfc_llcp_send_rr(llcp_sock);
1110
1111         release_sock(sk);
1112         nfc_llcp_sock_put(llcp_sock);
1113 }
1114
1115 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1116                                const struct sk_buff *skb)
1117 {
1118         struct nfc_llcp_sock *llcp_sock;
1119         struct sock *sk;
1120         u8 dsap, ssap;
1121
1122         dsap = nfc_llcp_dsap(skb);
1123         ssap = nfc_llcp_ssap(skb);
1124
1125         if ((dsap == 0) && (ssap == 0)) {
1126                 pr_debug("Connection termination");
1127                 nfc_dep_link_down(local->dev);
1128                 return;
1129         }
1130
1131         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1132         if (llcp_sock == NULL) {
1133                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1134                 return;
1135         }
1136
1137         sk = &llcp_sock->sk;
1138         lock_sock(sk);
1139
1140         nfc_llcp_socket_purge(llcp_sock);
1141
1142         if (sk->sk_state == LLCP_CLOSED) {
1143                 release_sock(sk);
1144                 nfc_llcp_sock_put(llcp_sock);
1145         }
1146
1147         if (sk->sk_state == LLCP_CONNECTED) {
1148                 nfc_put_device(local->dev);
1149                 sk->sk_state = LLCP_CLOSED;
1150                 sk->sk_state_change(sk);
1151         }
1152
1153         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1154
1155         release_sock(sk);
1156         nfc_llcp_sock_put(llcp_sock);
1157 }
1158
1159 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
1160                              const struct sk_buff *skb)
1161 {
1162         struct nfc_llcp_sock *llcp_sock;
1163         struct sock *sk;
1164         u8 dsap, ssap;
1165
1166         dsap = nfc_llcp_dsap(skb);
1167         ssap = nfc_llcp_ssap(skb);
1168
1169         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1170         if (llcp_sock == NULL) {
1171                 pr_err("Invalid CC\n");
1172                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1173
1174                 return;
1175         }
1176
1177         sk = &llcp_sock->sk;
1178
1179         /* Unlink from connecting and link to the client array */
1180         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1181         nfc_llcp_sock_link(&local->sockets, sk);
1182         llcp_sock->dsap = ssap;
1183
1184         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1185                                       skb->len - LLCP_HEADER_SIZE);
1186
1187         sk->sk_state = LLCP_CONNECTED;
1188         sk->sk_state_change(sk);
1189
1190         nfc_llcp_sock_put(llcp_sock);
1191 }
1192
1193 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
1194                              const struct sk_buff *skb)
1195 {
1196         struct nfc_llcp_sock *llcp_sock;
1197         struct sock *sk;
1198         u8 dsap, ssap, reason;
1199
1200         dsap = nfc_llcp_dsap(skb);
1201         ssap = nfc_llcp_ssap(skb);
1202         reason = skb->data[2];
1203
1204         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1205
1206         switch (reason) {
1207         case LLCP_DM_NOBOUND:
1208         case LLCP_DM_REJ:
1209                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1210                 break;
1211
1212         default:
1213                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1214                 break;
1215         }
1216
1217         if (llcp_sock == NULL) {
1218                 pr_debug("Already closed\n");
1219                 return;
1220         }
1221
1222         sk = &llcp_sock->sk;
1223
1224         sk->sk_err = ENXIO;
1225         sk->sk_state = LLCP_CLOSED;
1226         sk->sk_state_change(sk);
1227
1228         nfc_llcp_sock_put(llcp_sock);
1229 }
1230
1231 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1232                               const struct sk_buff *skb)
1233 {
1234         struct nfc_llcp_sock *llcp_sock;
1235         u8 dsap, ssap, type, length, tid, sap;
1236         const u8 *tlv;
1237         u16 tlv_len, offset;
1238         const char *service_name;
1239         size_t service_name_len;
1240         struct nfc_llcp_sdp_tlv *sdp;
1241         HLIST_HEAD(llc_sdres_list);
1242         size_t sdres_tlvs_len;
1243         HLIST_HEAD(nl_sdres_list);
1244
1245         dsap = nfc_llcp_dsap(skb);
1246         ssap = nfc_llcp_ssap(skb);
1247
1248         pr_debug("%d %d\n", dsap, ssap);
1249
1250         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1251                 pr_err("Wrong SNL SAP\n");
1252                 return;
1253         }
1254
1255         tlv = &skb->data[LLCP_HEADER_SIZE];
1256         tlv_len = skb->len - LLCP_HEADER_SIZE;
1257         offset = 0;
1258         sdres_tlvs_len = 0;
1259
1260         while (offset < tlv_len) {
1261                 type = tlv[0];
1262                 length = tlv[1];
1263
1264                 switch (type) {
1265                 case LLCP_TLV_SDREQ:
1266                         tid = tlv[2];
1267                         service_name = (char *) &tlv[3];
1268                         service_name_len = length - 1;
1269
1270                         pr_debug("Looking for %.16s\n", service_name);
1271
1272                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1273                             !strncmp(service_name, "urn:nfc:sn:sdp",
1274                                      service_name_len)) {
1275                                 sap = 1;
1276                                 goto add_snl;
1277                         }
1278
1279                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1280                                                           service_name_len);
1281                         if (!llcp_sock) {
1282                                 sap = 0;
1283                                 goto add_snl;
1284                         }
1285
1286                         /*
1287                          * We found a socket but its ssap has not been reserved
1288                          * yet. We need to assign it for good and send a reply.
1289                          * The ssap will be freed when the socket is closed.
1290                          */
1291                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1292                                 atomic_t *client_count;
1293
1294                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1295
1296                                 pr_debug("Reserving %d\n", sap);
1297
1298                                 if (sap == LLCP_SAP_MAX) {
1299                                         sap = 0;
1300                                         goto add_snl;
1301                                 }
1302
1303                                 client_count =
1304                                         &local->local_sdp_cnt[sap -
1305                                                               LLCP_WKS_NUM_SAP];
1306
1307                                 atomic_inc(client_count);
1308
1309                                 llcp_sock->ssap = sap;
1310                                 llcp_sock->reserved_ssap = sap;
1311                         } else {
1312                                 sap = llcp_sock->ssap;
1313                         }
1314
1315                         pr_debug("%p %d\n", llcp_sock, sap);
1316
1317 add_snl:
1318                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1319                         if (sdp == NULL)
1320                                 goto exit;
1321
1322                         sdres_tlvs_len += sdp->tlv_len;
1323                         hlist_add_head(&sdp->node, &llc_sdres_list);
1324                         break;
1325
1326                 case LLCP_TLV_SDRES:
1327                         mutex_lock(&local->sdreq_lock);
1328
1329                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1330
1331                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1332                                 if (sdp->tid != tlv[2])
1333                                         continue;
1334
1335                                 sdp->sap = tlv[3];
1336
1337                                 pr_debug("Found: uri=%s, sap=%d\n",
1338                                          sdp->uri, sdp->sap);
1339
1340                                 hlist_del(&sdp->node);
1341
1342                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1343
1344                                 break;
1345                         }
1346
1347                         mutex_unlock(&local->sdreq_lock);
1348                         break;
1349
1350                 default:
1351                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1352                         break;
1353                 }
1354
1355                 offset += length + 2;
1356                 tlv += length + 2;
1357         }
1358
1359 exit:
1360         if (!hlist_empty(&nl_sdres_list))
1361                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1362
1363         if (!hlist_empty(&llc_sdres_list))
1364                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1365 }
1366
1367 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1368 {
1369         u8 ptype;
1370         u16 pdu_len;
1371         struct sk_buff *new_skb;
1372
1373         if (skb->len <= LLCP_HEADER_SIZE) {
1374                 pr_err("Malformed AGF PDU\n");
1375                 return;
1376         }
1377
1378         skb_pull(skb, LLCP_HEADER_SIZE);
1379
1380         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1381                 pdu_len = skb->data[0] << 8 | skb->data[1];
1382
1383                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1384
1385                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1386                         pr_err("Malformed AGF PDU\n");
1387                         return;
1388                 }
1389
1390                 ptype = nfc_llcp_ptype(skb);
1391
1392                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1393                         goto next;
1394
1395                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1396                 if (new_skb == NULL) {
1397                         pr_err("Could not allocate PDU\n");
1398                         return;
1399                 }
1400
1401                 skb_put_data(new_skb, skb->data, pdu_len);
1402
1403                 nfc_llcp_rx_skb(local, new_skb);
1404
1405                 kfree_skb(new_skb);
1406 next:
1407                 skb_pull(skb, pdu_len);
1408         }
1409 }
1410
1411 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1412 {
1413         u8 dsap, ssap, ptype;
1414
1415         ptype = nfc_llcp_ptype(skb);
1416         dsap = nfc_llcp_dsap(skb);
1417         ssap = nfc_llcp_ssap(skb);
1418
1419         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1420
1421         if (ptype != LLCP_PDU_SYMM)
1422                 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1423                                      skb->data, skb->len, true);
1424
1425         switch (ptype) {
1426         case LLCP_PDU_SYMM:
1427                 pr_debug("SYMM\n");
1428                 break;
1429
1430         case LLCP_PDU_UI:
1431                 pr_debug("UI\n");
1432                 nfc_llcp_recv_ui(local, skb);
1433                 break;
1434
1435         case LLCP_PDU_CONNECT:
1436                 pr_debug("CONNECT\n");
1437                 nfc_llcp_recv_connect(local, skb);
1438                 break;
1439
1440         case LLCP_PDU_DISC:
1441                 pr_debug("DISC\n");
1442                 nfc_llcp_recv_disc(local, skb);
1443                 break;
1444
1445         case LLCP_PDU_CC:
1446                 pr_debug("CC\n");
1447                 nfc_llcp_recv_cc(local, skb);
1448                 break;
1449
1450         case LLCP_PDU_DM:
1451                 pr_debug("DM\n");
1452                 nfc_llcp_recv_dm(local, skb);
1453                 break;
1454
1455         case LLCP_PDU_SNL:
1456                 pr_debug("SNL\n");
1457                 nfc_llcp_recv_snl(local, skb);
1458                 break;
1459
1460         case LLCP_PDU_I:
1461         case LLCP_PDU_RR:
1462         case LLCP_PDU_RNR:
1463                 pr_debug("I frame\n");
1464                 nfc_llcp_recv_hdlc(local, skb);
1465                 break;
1466
1467         case LLCP_PDU_AGF:
1468                 pr_debug("AGF frame\n");
1469                 nfc_llcp_recv_agf(local, skb);
1470                 break;
1471         }
1472 }
1473
1474 static void nfc_llcp_rx_work(struct work_struct *work)
1475 {
1476         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1477                                                     rx_work);
1478         struct sk_buff *skb;
1479
1480         skb = local->rx_pending;
1481         if (skb == NULL) {
1482                 pr_debug("No pending SKB\n");
1483                 return;
1484         }
1485
1486         __net_timestamp(skb);
1487
1488         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1489
1490         nfc_llcp_rx_skb(local, skb);
1491
1492         schedule_work(&local->tx_work);
1493         kfree_skb(local->rx_pending);
1494         local->rx_pending = NULL;
1495 }
1496
1497 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1498 {
1499         local->rx_pending = skb;
1500         del_timer(&local->link_timer);
1501         schedule_work(&local->rx_work);
1502 }
1503
1504 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1505 {
1506         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1507
1508         pr_debug("Received an LLCP PDU\n");
1509         if (err < 0) {
1510                 pr_err("err %d\n", err);
1511                 return;
1512         }
1513
1514         __nfc_llcp_recv(local, skb);
1515 }
1516
1517 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1518 {
1519         struct nfc_llcp_local *local;
1520
1521         local = nfc_llcp_find_local(dev);
1522         if (local == NULL) {
1523                 kfree_skb(skb);
1524                 return -ENODEV;
1525         }
1526
1527         __nfc_llcp_recv(local, skb);
1528
1529         return 0;
1530 }
1531
1532 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1533 {
1534         struct nfc_llcp_local *local;
1535
1536         local = nfc_llcp_find_local(dev);
1537         if (local == NULL)
1538                 return;
1539
1540         local->remote_miu = LLCP_DEFAULT_MIU;
1541         local->remote_lto = LLCP_DEFAULT_LTO;
1542
1543         /* Close and purge all existing sockets */
1544         nfc_llcp_socket_release(local, true, 0);
1545 }
1546
1547 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1548                         u8 comm_mode, u8 rf_mode)
1549 {
1550         struct nfc_llcp_local *local;
1551
1552         pr_debug("rf mode %d\n", rf_mode);
1553
1554         local = nfc_llcp_find_local(dev);
1555         if (local == NULL)
1556                 return;
1557
1558         local->target_idx = target_idx;
1559         local->comm_mode = comm_mode;
1560         local->rf_mode = rf_mode;
1561
1562         if (rf_mode == NFC_RF_INITIATOR) {
1563                 pr_debug("Queueing Tx work\n");
1564
1565                 schedule_work(&local->tx_work);
1566         } else {
1567                 mod_timer(&local->link_timer,
1568                           jiffies + msecs_to_jiffies(local->remote_lto));
1569         }
1570 }
1571
1572 int nfc_llcp_register_device(struct nfc_dev *ndev)
1573 {
1574         struct nfc_llcp_local *local;
1575
1576         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1577         if (local == NULL)
1578                 return -ENOMEM;
1579
1580         local->dev = ndev;
1581         INIT_LIST_HEAD(&local->list);
1582         kref_init(&local->ref);
1583         mutex_init(&local->sdp_lock);
1584         timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1585
1586         skb_queue_head_init(&local->tx_queue);
1587         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1588
1589         local->rx_pending = NULL;
1590         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1591
1592         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1593
1594         rwlock_init(&local->sockets.lock);
1595         rwlock_init(&local->connecting_sockets.lock);
1596         rwlock_init(&local->raw_sockets.lock);
1597
1598         local->lto = 150; /* 1500 ms */
1599         local->rw = LLCP_MAX_RW;
1600         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1601         local->local_wks = 0x1; /* LLC Link Management */
1602
1603         nfc_llcp_build_gb(local);
1604
1605         local->remote_miu = LLCP_DEFAULT_MIU;
1606         local->remote_lto = LLCP_DEFAULT_LTO;
1607
1608         mutex_init(&local->sdreq_lock);
1609         INIT_HLIST_HEAD(&local->pending_sdreqs);
1610         timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1611         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1612
1613         list_add(&local->list, &llcp_devices);
1614
1615         return 0;
1616 }
1617
1618 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1619 {
1620         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1621
1622         if (local == NULL) {
1623                 pr_debug("No such device\n");
1624                 return;
1625         }
1626
1627         local_cleanup(local);
1628
1629         nfc_llcp_local_put(local);
1630 }
1631
1632 int __init nfc_llcp_init(void)
1633 {
1634         return nfc_llcp_sock_init();
1635 }
1636
1637 void nfc_llcp_exit(void)
1638 {
1639         nfc_llcp_sock_exit();
1640 }