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         skb_queue_purge(&sock->tx_queue);
  49         skb_queue_purge(&sock->tx_pending_queue);
  50
  51         if (local == NULL)
  52                 return;
  53
  54         /* Search for local pending SKBs that are related to this socket */
  55         skb_queue_walk_safe(&local->tx_queue, s, tmp) {
  56                 if (s->sk != &sock->sk)
  57                         continue;
  58
  59                 skb_unlink(s, &local->tx_queue);
  60                 kfree_skb(s);
  61         }
  62 }
  63
  64 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
  65                                     int err)
  66 {
  67         struct sock *sk;
  68         struct hlist_node *tmp;
  69         struct nfc_llcp_sock *llcp_sock;
  70
  71         skb_queue_purge(&local->tx_queue);
  72
  73         write_lock(&local->sockets.lock);
  74
  75         sk_for_each_safe(sk, tmp, &local->sockets.head) {
  76                 llcp_sock = nfc_llcp_sock(sk);
  77
  78                 bh_lock_sock(sk);
  79
  80                 nfc_llcp_socket_purge(llcp_sock);
  81
  82                 if (sk->sk_state == LLCP_CONNECTED)
  83                         nfc_put_device(llcp_sock->dev);
  84
  85                 if (sk->sk_state == LLCP_LISTEN) {
  86                         struct nfc_llcp_sock *lsk, *n;
  87                         struct sock *accept_sk;
  88
  89                         list_for_each_entry_safe(lsk, n,
  90                                                  &llcp_sock->accept_queue,
  91                                                  accept_queue) {
  92                                 accept_sk = &lsk->sk;
  93                                 bh_lock_sock(accept_sk);
  94
  95                                 nfc_llcp_accept_unlink(accept_sk);
  96
  97                                 if (err)
  98                                         accept_sk->sk_err = err;
  99                                 accept_sk->sk_state = LLCP_CLOSED;
 100                                 accept_sk->sk_state_change(sk);
 101
 102                                 bh_unlock_sock(accept_sk);
 103                         }
 104                 }
 105
 106                 if (err)
 107                         sk->sk_err = err;
 108                 sk->sk_state = LLCP_CLOSED;
 109                 sk->sk_state_change(sk);
 110
 111                 bh_unlock_sock(sk);
 112
 113                 sk_del_node_init(sk);
 114         }
 115
 116         write_unlock(&local->sockets.lock);
 117
 118         /* If we still have a device, we keep the RAW sockets alive */
 119         if (device == true)
 120                 return;
 121
 122         write_lock(&local->raw_sockets.lock);
 123
 124         sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
 125                 llcp_sock = nfc_llcp_sock(sk);
 126
 127                 bh_lock_sock(sk);
 128
 129                 nfc_llcp_socket_purge(llcp_sock);
 130
 131                 if (err)
 132                         sk->sk_err = err;
 133                 sk->sk_state = LLCP_CLOSED;
 134                 sk->sk_state_change(sk);
 135
 136                 bh_unlock_sock(sk);
 137
 138                 sk_del_node_init(sk);
 139         }
 140
 141         write_unlock(&local->raw_sockets.lock);
 142 }
 143
 144 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
 145 {
 146         kref_get(&local->ref);
 147
 148         return local;
 149 }
 150
 151 static void local_cleanup(struct nfc_llcp_local *local)
 152 {
 153         nfc_llcp_socket_release(local, false, ENXIO);
 154         del_timer_sync(&local->link_timer);
 155         skb_queue_purge(&local->tx_queue);
 156         cancel_work_sync(&local->tx_work);
 157         cancel_work_sync(&local->rx_work);
 158         cancel_work_sync(&local->timeout_work);
 159         kfree_skb(local->rx_pending);
 160         local->rx_pending = NULL;
 161         del_timer_sync(&local->sdreq_timer);
 162         cancel_work_sync(&local->sdreq_timeout_work);
 163         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
 164 }
 165
 166 static void local_release(struct kref *ref)
 167 {
 168         struct nfc_llcp_local *local;
 169
 170         local = container_of(ref, struct nfc_llcp_local, ref);
 171
 172         list_del(&local->list);
 173         local_cleanup(local);
 174         kfree(local);
 175 }
 176
 177 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 178 {
 179         if (local == NULL)
 180                 return 0;
 181
 182         return kref_put(&local->ref, local_release);
 183 }
 184
 185 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 186                                                u8 ssap, u8 dsap)
 187 {
 188         struct sock *sk;
 189         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 190
 191         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 192
 193         if (ssap == 0 && dsap == 0)
 194                 return NULL;
 195
 196         read_lock(&local->sockets.lock);
 197
 198         llcp_sock = NULL;
 199
 200         sk_for_each(sk, &local->sockets.head) {
 201                 tmp_sock = nfc_llcp_sock(sk);
 202
 203                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 204                         llcp_sock = tmp_sock;
 205                         break;
 206                 }
 207         }
 208
 209         read_unlock(&local->sockets.lock);
 210
 211         if (llcp_sock == NULL)
 212                 return NULL;
 213
 214         sock_hold(&llcp_sock->sk);
 215
 216         return llcp_sock;
 217 }
 218
 219 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 220 {
 221         sock_put(&sock->sk);
 222 }
 223
 224 static void nfc_llcp_timeout_work(struct work_struct *work)
 225 {
 226         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 227                                                     timeout_work);
 228
 229         nfc_dep_link_down(local->dev);
 230 }
 231
 232 static void nfc_llcp_symm_timer(struct timer_list *t)
 233 {
 234         struct nfc_llcp_local *local = from_timer(local, t, link_timer);
 235
 236         pr_err("SYMM timeout\n");
 237
 238         schedule_work(&local->timeout_work);
 239 }
 240
 241 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
 242 {
 243         unsigned long time;
 244         HLIST_HEAD(nl_sdres_list);
 245         struct hlist_node *n;
 246         struct nfc_llcp_sdp_tlv *sdp;
 247         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 248                                                     sdreq_timeout_work);
 249
 250         mutex_lock(&local->sdreq_lock);
 251
 252         time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
 253
 254         hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
 255                 if (time_after(sdp->time, time))
 256                         continue;
 257
 258                 sdp->sap = LLCP_SDP_UNBOUND;
 259
 260                 hlist_del(&sdp->node);
 261
 262                 hlist_add_head(&sdp->node, &nl_sdres_list);
 263         }
 264
 265         if (!hlist_empty(&local->pending_sdreqs))
 266                 mod_timer(&local->sdreq_timer,
 267                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
 268
 269         mutex_unlock(&local->sdreq_lock);
 270
 271         if (!hlist_empty(&nl_sdres_list))
 272                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
 273 }
 274
 275 static void nfc_llcp_sdreq_timer(struct timer_list *t)
 276 {
 277         struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
 278
 279         schedule_work(&local->sdreq_timeout_work);
 280 }
 281
 282 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 283 {
 284         struct nfc_llcp_local *local;
 285
 286         list_for_each_entry(local, &llcp_devices, list)
 287                 if (local->dev == dev)
 288                         return local;
 289
 290         pr_debug("No device found\n");
 291
 292         return NULL;
 293 }
 294
 295 static char *wks[] = {
 296         NULL,
 297         NULL, /* SDP */
 298         "urn:nfc:sn:ip",
 299         "urn:nfc:sn:obex",
 300         "urn:nfc:sn:snep",
 301 };
 302
 303 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
 304 {
 305         int sap, num_wks;
 306
 307         pr_debug("%s\n", service_name);
 308
 309         if (service_name == NULL)
 310                 return -EINVAL;
 311
 312         num_wks = ARRAY_SIZE(wks);
 313
 314         for (sap = 0; sap < num_wks; sap++) {
 315                 if (wks[sap] == NULL)
 316                         continue;
 317
 318                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 319                         return sap;
 320         }
 321
 322         return -EINVAL;
 323 }
 324
 325 static
 326 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 327                                             const u8 *sn, size_t sn_len)
 328 {
 329         struct sock *sk;
 330         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 331
 332         pr_debug("sn %zd %p\n", sn_len, sn);
 333
 334         if (sn == NULL || sn_len == 0)
 335                 return NULL;
 336
 337         read_lock(&local->sockets.lock);
 338
 339         llcp_sock = NULL;
 340
 341         sk_for_each(sk, &local->sockets.head) {
 342                 tmp_sock = nfc_llcp_sock(sk);
 343
 344                 pr_debug("llcp sock %p\n", tmp_sock);
 345
 346                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 347                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 348                         continue;
 349
 350                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 351                     tmp_sock->sk.sk_state != LLCP_BOUND)
 352                         continue;
 353
 354                 if (tmp_sock->service_name == NULL ||
 355                     tmp_sock->service_name_len == 0)
 356                         continue;
 357
 358                 if (tmp_sock->service_name_len != sn_len)
 359                         continue;
 360
 361                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 362                         llcp_sock = tmp_sock;
 363                         break;
 364                 }
 365         }
 366
 367         read_unlock(&local->sockets.lock);
 368
 369         pr_debug("Found llcp sock %p\n", llcp_sock);
 370
 371         return llcp_sock;
 372 }
 373
 374 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 375                          struct nfc_llcp_sock *sock)
 376 {
 377         mutex_lock(&local->sdp_lock);
 378
 379         if (sock->service_name != NULL && sock->service_name_len > 0) {
 380                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 381                                             sock->service_name_len);
 382
 383                 if (ssap > 0) {
 384                         pr_debug("WKS %d\n", ssap);
 385
 386                         /* This is a WKS, let's check if it's free */
 387                         if (test_bit(ssap, &local->local_wks)) {
 388                                 mutex_unlock(&local->sdp_lock);
 389
 390                                 return LLCP_SAP_MAX;
 391                         }
 392
 393                         set_bit(ssap, &local->local_wks);
 394                         mutex_unlock(&local->sdp_lock);
 395
 396                         return ssap;
 397                 }
 398
 399                 /*
 400                  * Check if there already is a non WKS socket bound
 401                  * to this service name.
 402                  */
 403                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 404                                           sock->service_name_len) != NULL) {
 405                         mutex_unlock(&local->sdp_lock);
 406
 407                         return LLCP_SAP_MAX;
 408                 }
 409
 410                 mutex_unlock(&local->sdp_lock);
 411
 412                 return LLCP_SDP_UNBOUND;
 413
 414         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 415                 if (!test_bit(sock->ssap, &local->local_wks)) {
 416                         set_bit(sock->ssap, &local->local_wks);
 417                         mutex_unlock(&local->sdp_lock);
 418
 419                         return sock->ssap;
 420                 }
 421         }
 422
 423         mutex_unlock(&local->sdp_lock);
 424
 425         return LLCP_SAP_MAX;
 426 }
 427
 428 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 429 {
 430         u8 local_ssap;
 431
 432         mutex_lock(&local->sdp_lock);
 433
 434         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 435         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 436                 mutex_unlock(&local->sdp_lock);
 437                 return LLCP_SAP_MAX;
 438         }
 439
 440         set_bit(local_ssap, &local->local_sap);
 441
 442         mutex_unlock(&local->sdp_lock);
 443
 444         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 445 }
 446
 447 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 448 {
 449         u8 local_ssap;
 450         unsigned long *sdp;
 451
 452         if (ssap < LLCP_WKS_NUM_SAP) {
 453                 local_ssap = ssap;
 454                 sdp = &local->local_wks;
 455         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 456                 atomic_t *client_cnt;
 457
 458                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 459                 sdp = &local->local_sdp;
 460                 client_cnt = &local->local_sdp_cnt[local_ssap];
 461
 462                 pr_debug("%d clients\n", atomic_read(client_cnt));
 463
 464                 mutex_lock(&local->sdp_lock);
 465
 466                 if (atomic_dec_and_test(client_cnt)) {
 467                         struct nfc_llcp_sock *l_sock;
 468
 469                         pr_debug("No more clients for SAP %d\n", ssap);
 470
 471                         clear_bit(local_ssap, sdp);
 472
 473                         /* Find the listening sock and set it back to UNBOUND */
 474                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 475                         if (l_sock) {
 476                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 477                                 nfc_llcp_sock_put(l_sock);
 478                         }
 479                 }
 480
 481                 mutex_unlock(&local->sdp_lock);
 482
 483                 return;
 484         } else if (ssap < LLCP_MAX_SAP) {
 485                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 486                 sdp = &local->local_sap;
 487         } else {
 488                 return;
 489         }
 490
 491         mutex_lock(&local->sdp_lock);
 492
 493         clear_bit(local_ssap, sdp);
 494
 495         mutex_unlock(&local->sdp_lock);
 496 }
 497
 498 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 499 {
 500         u8 ssap;
 501
 502         mutex_lock(&local->sdp_lock);
 503
 504         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 505         if (ssap == LLCP_SDP_NUM_SAP) {
 506                 mutex_unlock(&local->sdp_lock);
 507
 508                 return LLCP_SAP_MAX;
 509         }
 510
 511         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 512
 513         set_bit(ssap, &local->local_sdp);
 514
 515         mutex_unlock(&local->sdp_lock);
 516
 517         return LLCP_WKS_NUM_SAP + ssap;
 518 }
 519
 520 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 521 {
 522         u8 *gb_cur, version, version_length;
 523         u8 lto_length, wks_length, miux_length;
 524         const u8 *version_tlv = NULL, *lto_tlv = NULL,
 525            *wks_tlv = NULL, *miux_tlv = NULL;
 526         __be16 wks = cpu_to_be16(local->local_wks);
 527         u8 gb_len = 0;
 528         int ret = 0;
 529
 530         version = LLCP_VERSION_11;
 531         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 532                                          1, &version_length);
 533         if (!version_tlv) {
 534                 ret = -ENOMEM;
 535                 goto out;
 536         }
 537         gb_len += version_length;
 538
 539         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 540         if (!lto_tlv) {
 541                 ret = -ENOMEM;
 542                 goto out;
 543         }
 544         gb_len += lto_length;
 545
 546         pr_debug("Local wks 0x%lx\n", local->local_wks);
 547         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
 548         if (!wks_tlv) {
 549                 ret = -ENOMEM;
 550                 goto out;
 551         }
 552         gb_len += wks_length;
 553
 554         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 555                                       &miux_length);
 556         if (!miux_tlv) {
 557                 ret = -ENOMEM;
 558                 goto out;
 559         }
 560         gb_len += miux_length;
 561
 562         gb_len += ARRAY_SIZE(llcp_magic);
 563
 564         if (gb_len > NFC_MAX_GT_LEN) {
 565                 ret = -EINVAL;
 566                 goto out;
 567         }
 568
 569         gb_cur = local->gb;
 570
 571         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 572         gb_cur += ARRAY_SIZE(llcp_magic);
 573
 574         memcpy(gb_cur, version_tlv, version_length);
 575         gb_cur += version_length;
 576
 577         memcpy(gb_cur, lto_tlv, lto_length);
 578         gb_cur += lto_length;
 579
 580         memcpy(gb_cur, wks_tlv, wks_length);
 581         gb_cur += wks_length;
 582
 583         memcpy(gb_cur, miux_tlv, miux_length);
 584         gb_cur += miux_length;
 585
 586         local->gb_len = gb_len;
 587
 588 out:
 589         kfree(version_tlv);
 590         kfree(lto_tlv);
 591         kfree(wks_tlv);
 592         kfree(miux_tlv);
 593
 594         return ret;
 595 }
 596
 597 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 598 {
 599         struct nfc_llcp_local *local;
 600
 601         local = nfc_llcp_find_local(dev);
 602         if (local == NULL) {
 603                 *general_bytes_len = 0;
 604                 return NULL;
 605         }
 606
 607         nfc_llcp_build_gb(local);
 608
 609         *general_bytes_len = local->gb_len;
 610
 611         return local->gb;
 612 }
 613
 614 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
 615 {
 616         struct nfc_llcp_local *local;
 617
 618         if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
 619                 return -EINVAL;
 620
 621         local = nfc_llcp_find_local(dev);
 622         if (local == NULL) {
 623                 pr_err("No LLCP device\n");
 624                 return -ENODEV;
 625         }
 626
 627         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 628         memcpy(local->remote_gb, gb, gb_len);
 629         local->remote_gb_len = gb_len;
 630
 631         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 632                 pr_err("MAC does not support LLCP\n");
 633                 return -EINVAL;
 634         }
 635
 636         return nfc_llcp_parse_gb_tlv(local,
 637                                      &local->remote_gb[3],
 638                                      local->remote_gb_len - 3);
 639 }
 640
 641 static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
 642 {
 643         return (pdu->data[0] & 0xfc) >> 2;
 644 }
 645
 646 static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
 647 {
 648         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 649 }
 650
 651 static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
 652 {
 653         return pdu->data[1] & 0x3f;
 654 }
 655
 656 static u8 nfc_llcp_ns(const struct sk_buff *pdu)
 657 {
 658         return pdu->data[2] >> 4;
 659 }
 660
 661 static u8 nfc_llcp_nr(const struct sk_buff *pdu)
 662 {
 663         return pdu->data[2] & 0xf;
 664 }
 665
 666 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 667 {
 668         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 669         sock->send_n = (sock->send_n + 1) % 16;
 670         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 671 }
 672
 673 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 674                                struct sk_buff *skb, u8 direction)
 675 {
 676         struct sk_buff *skb_copy = NULL, *nskb;
 677         struct sock *sk;
 678         u8 *data;
 679
 680         read_lock(&local->raw_sockets.lock);
 681
 682         sk_for_each(sk, &local->raw_sockets.head) {
 683                 if (sk->sk_state != LLCP_BOUND)
 684                         continue;
 685
 686                 if (skb_copy == NULL) {
 687                         skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
 688                                                       GFP_ATOMIC, true);
 689
 690                         if (skb_copy == NULL)
 691                                 continue;
 692
 693                         data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
 694
 695                         data[0] = local->dev ? local->dev->idx : 0xFF;
 696                         data[1] = direction & 0x01;
 697                         data[1] |= (RAW_PAYLOAD_LLCP << 1);
 698                 }
 699
 700                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 701                 if (!nskb)
 702                         continue;
 703
 704                 if (sock_queue_rcv_skb(sk, nskb))
 705                         kfree_skb(nskb);
 706         }
 707
 708         read_unlock(&local->raw_sockets.lock);
 709
 710         kfree_skb(skb_copy);
 711 }
 712
 713 static void nfc_llcp_tx_work(struct work_struct *work)
 714 {
 715         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 716                                                     tx_work);
 717         struct sk_buff *skb;
 718         struct sock *sk;
 719         struct nfc_llcp_sock *llcp_sock;
 720
 721         skb = skb_dequeue(&local->tx_queue);
 722         if (skb != NULL) {
 723                 sk = skb->sk;
 724                 llcp_sock = nfc_llcp_sock(sk);
 725
 726                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 727                         kfree_skb(skb);
 728                         nfc_llcp_send_symm(local->dev);
 729                 } else if (llcp_sock && !llcp_sock->remote_ready) {
 730                         skb_queue_head(&local->tx_queue, skb);
 731                         nfc_llcp_send_symm(local->dev);
 732                 } else {
 733                         struct sk_buff *copy_skb = NULL;
 734                         u8 ptype = nfc_llcp_ptype(skb);
 735                         int ret;
 736
 737                         pr_debug("Sending pending skb\n");
 738                         print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
 739                                              16, 1, skb->data, skb->len, true);
 740
 741                         if (ptype == LLCP_PDU_I)
 742                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 743
 744                         __net_timestamp(skb);
 745
 746                         nfc_llcp_send_to_raw_sock(local, skb,
 747                                                   NFC_DIRECTION_TX);
 748
 749                         ret = nfc_data_exchange(local->dev, local->target_idx,
 750                                                 skb, nfc_llcp_recv, local);
 751
 752                         if (ret) {
 753                                 kfree_skb(copy_skb);
 754                                 goto out;
 755                         }
 756
 757                         if (ptype == LLCP_PDU_I && copy_skb)
 758                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 759                                                copy_skb);
 760                 }
 761         } else {
 762                 nfc_llcp_send_symm(local->dev);
 763         }
 764
 765 out:
 766         mod_timer(&local->link_timer,
 767                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 768 }
 769
 770 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 771                                                           u8 ssap)
 772 {
 773         struct sock *sk;
 774         struct nfc_llcp_sock *llcp_sock;
 775
 776         read_lock(&local->connecting_sockets.lock);
 777
 778         sk_for_each(sk, &local->connecting_sockets.head) {
 779                 llcp_sock = nfc_llcp_sock(sk);
 780
 781                 if (llcp_sock->ssap == ssap) {
 782                         sock_hold(&llcp_sock->sk);
 783                         goto out;
 784                 }
 785         }
 786
 787         llcp_sock = NULL;
 788
 789 out:
 790         read_unlock(&local->connecting_sockets.lock);
 791
 792         return llcp_sock;
 793 }
 794
 795 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 796                                                   const u8 *sn, size_t sn_len)
 797 {
 798         struct nfc_llcp_sock *llcp_sock;
 799
 800         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 801
 802         if (llcp_sock == NULL)
 803                 return NULL;
 804
 805         sock_hold(&llcp_sock->sk);
 806
 807         return llcp_sock;
 808 }
 809
 810 static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
 811 {
 812         u8 type, length;
 813         const u8 *tlv = &skb->data[2];
 814         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 815
 816         while (offset < tlv_array_len) {
 817                 type = tlv[0];
 818                 length = tlv[1];
 819
 820                 pr_debug("type 0x%x length %d\n", type, length);
 821
 822                 if (type == LLCP_TLV_SN) {
 823                         *sn_len = length;
 824                         return &tlv[2];
 825                 }
 826
 827                 offset += length + 2;
 828                 tlv += length + 2;
 829         }
 830
 831         return NULL;
 832 }
 833
 834 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 835                              struct sk_buff *skb)
 836 {
 837         struct nfc_llcp_sock *llcp_sock;
 838         struct nfc_llcp_ui_cb *ui_cb;
 839         u8 dsap, ssap;
 840
 841         dsap = nfc_llcp_dsap(skb);
 842         ssap = nfc_llcp_ssap(skb);
 843
 844         ui_cb = nfc_llcp_ui_skb_cb(skb);
 845         ui_cb->dsap = dsap;
 846         ui_cb->ssap = ssap;
 847
 848         pr_debug("%d %d\n", dsap, ssap);
 849
 850         /* We're looking for a bound socket, not a client one */
 851         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 852         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 853                 return;
 854
 855         /* There is no sequence with UI frames */
 856         skb_pull(skb, LLCP_HEADER_SIZE);
 857         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 858                 /*
 859                  * UI frames will be freed from the socket layer, so we
 860                  * need to keep them alive until someone receives them.
 861                  */
 862                 skb_get(skb);
 863         } else {
 864                 pr_err("Receive queue is full\n");
 865         }
 866
 867         nfc_llcp_sock_put(llcp_sock);
 868 }
 869
 870 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 871                                   const struct sk_buff *skb)
 872 {
 873         struct sock *new_sk, *parent;
 874         struct nfc_llcp_sock *sock, *new_sock;
 875         u8 dsap, ssap, reason;
 876
 877         dsap = nfc_llcp_dsap(skb);
 878         ssap = nfc_llcp_ssap(skb);
 879
 880         pr_debug("%d %d\n", dsap, ssap);
 881
 882         if (dsap != LLCP_SAP_SDP) {
 883                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 884                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 885                         reason = LLCP_DM_NOBOUND;
 886                         goto fail;
 887                 }
 888         } else {
 889                 const u8 *sn;
 890                 size_t sn_len;
 891
 892                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 893                 if (sn == NULL) {
 894                         reason = LLCP_DM_NOBOUND;
 895                         goto fail;
 896                 }
 897
 898                 pr_debug("Service name length %zu\n", sn_len);
 899
 900                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 901                 if (sock == NULL) {
 902                         reason = LLCP_DM_NOBOUND;
 903                         goto fail;
 904                 }
 905         }
 906
 907         lock_sock(&sock->sk);
 908
 909         parent = &sock->sk;
 910
 911         if (sk_acceptq_is_full(parent)) {
 912                 reason = LLCP_DM_REJ;
 913                 release_sock(&sock->sk);
 914                 sock_put(&sock->sk);
 915                 goto fail;
 916         }
 917
 918         if (sock->ssap == LLCP_SDP_UNBOUND) {
 919                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 920
 921                 pr_debug("First client, reserving %d\n", ssap);
 922
 923                 if (ssap == LLCP_SAP_MAX) {
 924                         reason = LLCP_DM_REJ;
 925                         release_sock(&sock->sk);
 926                         sock_put(&sock->sk);
 927                         goto fail;
 928                 }
 929
 930                 sock->ssap = ssap;
 931         }
 932
 933         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
 934         if (new_sk == NULL) {
 935                 reason = LLCP_DM_REJ;
 936                 release_sock(&sock->sk);
 937                 sock_put(&sock->sk);
 938                 goto fail;
 939         }
 940
 941         new_sock = nfc_llcp_sock(new_sk);
 942         new_sock->dev = local->dev;
 943         new_sock->local = nfc_llcp_local_get(local);
 944         new_sock->rw = sock->rw;
 945         new_sock->miux = sock->miux;
 946         new_sock->nfc_protocol = sock->nfc_protocol;
 947         new_sock->dsap = ssap;
 948         new_sock->target_idx = local->target_idx;
 949         new_sock->parent = parent;
 950         new_sock->ssap = sock->ssap;
 951         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 952                 atomic_t *client_count;
 953
 954                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 955
 956                 client_count =
 957                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 958
 959                 atomic_inc(client_count);
 960                 new_sock->reserved_ssap = sock->ssap;
 961         }
 962
 963         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 964                                       skb->len - LLCP_HEADER_SIZE);
 965
 966         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 967
 968         nfc_llcp_sock_link(&local->sockets, new_sk);
 969
 970         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 971
 972         nfc_get_device(local->dev->idx);
 973
 974         new_sk->sk_state = LLCP_CONNECTED;
 975
 976         /* Wake the listening processes */
 977         parent->sk_data_ready(parent);
 978
 979         /* Send CC */
 980         nfc_llcp_send_cc(new_sock);
 981
 982         release_sock(&sock->sk);
 983         sock_put(&sock->sk);
 984
 985         return;
 986
 987 fail:
 988         /* Send DM */
 989         nfc_llcp_send_dm(local, dsap, ssap, reason);
 990 }
 991
 992 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
 993 {
 994         int nr_frames = 0;
 995         struct nfc_llcp_local *local = sock->local;
 996
 997         pr_debug("Remote ready %d tx queue len %d remote rw %d",
 998                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
 999                  sock->remote_rw);
1000
1001         /* Try to queue some I frames for transmission */
1002         while (sock->remote_ready &&
1003                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1004                 struct sk_buff *pdu;
1005
1006                 pdu = skb_dequeue(&sock->tx_queue);
1007                 if (pdu == NULL)
1008                         break;
1009
1010                 /* Update N(S)/N(R) */
1011                 nfc_llcp_set_nrns(sock, pdu);
1012
1013                 skb_queue_tail(&local->tx_queue, pdu);
1014                 nr_frames++;
1015         }
1016
1017         return nr_frames;
1018 }
1019
1020 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1021                                struct sk_buff *skb)
1022 {
1023         struct nfc_llcp_sock *llcp_sock;
1024         struct sock *sk;
1025         u8 dsap, ssap, ptype, ns, nr;
1026
1027         ptype = nfc_llcp_ptype(skb);
1028         dsap = nfc_llcp_dsap(skb);
1029         ssap = nfc_llcp_ssap(skb);
1030         ns = nfc_llcp_ns(skb);
1031         nr = nfc_llcp_nr(skb);
1032
1033         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1034
1035         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1036         if (llcp_sock == NULL) {
1037                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1038                 return;
1039         }
1040
1041         sk = &llcp_sock->sk;
1042         lock_sock(sk);
1043         if (sk->sk_state == LLCP_CLOSED) {
1044                 release_sock(sk);
1045                 nfc_llcp_sock_put(llcp_sock);
1046         }
1047
1048         /* Pass the payload upstream */
1049         if (ptype == LLCP_PDU_I) {
1050                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1051
1052                 if (ns == llcp_sock->recv_n)
1053                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1054                 else
1055                         pr_err("Received out of sequence I PDU\n");
1056
1057                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1058                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1059                         /*
1060                          * I frames will be freed from the socket layer, so we
1061                          * need to keep them alive until someone receives them.
1062                          */
1063                         skb_get(skb);
1064                 } else {
1065                         pr_err("Receive queue is full\n");
1066                 }
1067         }
1068
1069         /* Remove skbs from the pending queue */
1070         if (llcp_sock->send_ack_n != nr) {
1071                 struct sk_buff *s, *tmp;
1072                 u8 n;
1073
1074                 llcp_sock->send_ack_n = nr;
1075
1076                 /* Remove and free all skbs until ns == nr */
1077                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1078                         n = nfc_llcp_ns(s);
1079
1080                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1081                         kfree_skb(s);
1082
1083                         if (n == nr)
1084                                 break;
1085                 }
1086
1087                 /* Re-queue the remaining skbs for transmission */
1088                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1089                                             s, tmp) {
1090                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1091                         skb_queue_head(&local->tx_queue, s);
1092                 }
1093         }
1094
1095         if (ptype == LLCP_PDU_RR)
1096                 llcp_sock->remote_ready = true;
1097         else if (ptype == LLCP_PDU_RNR)
1098                 llcp_sock->remote_ready = false;
1099
1100         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1101                 nfc_llcp_send_rr(llcp_sock);
1102
1103         release_sock(sk);
1104         nfc_llcp_sock_put(llcp_sock);
1105 }
1106
1107 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1108                                const struct sk_buff *skb)
1109 {
1110         struct nfc_llcp_sock *llcp_sock;
1111         struct sock *sk;
1112         u8 dsap, ssap;
1113
1114         dsap = nfc_llcp_dsap(skb);
1115         ssap = nfc_llcp_ssap(skb);
1116
1117         if ((dsap == 0) && (ssap == 0)) {
1118                 pr_debug("Connection termination");
1119                 nfc_dep_link_down(local->dev);
1120                 return;
1121         }
1122
1123         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1124         if (llcp_sock == NULL) {
1125                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1126                 return;
1127         }
1128
1129         sk = &llcp_sock->sk;
1130         lock_sock(sk);
1131
1132         nfc_llcp_socket_purge(llcp_sock);
1133
1134         if (sk->sk_state == LLCP_CLOSED) {
1135                 release_sock(sk);
1136                 nfc_llcp_sock_put(llcp_sock);
1137         }
1138
1139         if (sk->sk_state == LLCP_CONNECTED) {
1140                 nfc_put_device(local->dev);
1141                 sk->sk_state = LLCP_CLOSED;
1142                 sk->sk_state_change(sk);
1143         }
1144
1145         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1146
1147         release_sock(sk);
1148         nfc_llcp_sock_put(llcp_sock);
1149 }
1150
1151 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
1152                              const struct sk_buff *skb)
1153 {
1154         struct nfc_llcp_sock *llcp_sock;
1155         struct sock *sk;
1156         u8 dsap, ssap;
1157
1158         dsap = nfc_llcp_dsap(skb);
1159         ssap = nfc_llcp_ssap(skb);
1160
1161         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1162         if (llcp_sock == NULL) {
1163                 pr_err("Invalid CC\n");
1164                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1165
1166                 return;
1167         }
1168
1169         sk = &llcp_sock->sk;
1170
1171         /* Unlink from connecting and link to the client array */
1172         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1173         nfc_llcp_sock_link(&local->sockets, sk);
1174         llcp_sock->dsap = ssap;
1175
1176         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1177                                       skb->len - LLCP_HEADER_SIZE);
1178
1179         sk->sk_state = LLCP_CONNECTED;
1180         sk->sk_state_change(sk);
1181
1182         nfc_llcp_sock_put(llcp_sock);
1183 }
1184
1185 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
1186                              const struct sk_buff *skb)
1187 {
1188         struct nfc_llcp_sock *llcp_sock;
1189         struct sock *sk;
1190         u8 dsap, ssap, reason;
1191
1192         dsap = nfc_llcp_dsap(skb);
1193         ssap = nfc_llcp_ssap(skb);
1194         reason = skb->data[2];
1195
1196         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1197
1198         switch (reason) {
1199         case LLCP_DM_NOBOUND:
1200         case LLCP_DM_REJ:
1201                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1202                 break;
1203
1204         default:
1205                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1206                 break;
1207         }
1208
1209         if (llcp_sock == NULL) {
1210                 pr_debug("Already closed\n");
1211                 return;
1212         }
1213
1214         sk = &llcp_sock->sk;
1215
1216         sk->sk_err = ENXIO;
1217         sk->sk_state = LLCP_CLOSED;
1218         sk->sk_state_change(sk);
1219
1220         nfc_llcp_sock_put(llcp_sock);
1221 }
1222
1223 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1224                               const struct sk_buff *skb)
1225 {
1226         struct nfc_llcp_sock *llcp_sock;
1227         u8 dsap, ssap, type, length, tid, sap;
1228         const u8 *tlv;
1229         u16 tlv_len, offset;
1230         const char *service_name;
1231         size_t service_name_len;
1232         struct nfc_llcp_sdp_tlv *sdp;
1233         HLIST_HEAD(llc_sdres_list);
1234         size_t sdres_tlvs_len;
1235         HLIST_HEAD(nl_sdres_list);
1236
1237         dsap = nfc_llcp_dsap(skb);
1238         ssap = nfc_llcp_ssap(skb);
1239
1240         pr_debug("%d %d\n", dsap, ssap);
1241
1242         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1243                 pr_err("Wrong SNL SAP\n");
1244                 return;
1245         }
1246
1247         tlv = &skb->data[LLCP_HEADER_SIZE];
1248         tlv_len = skb->len - LLCP_HEADER_SIZE;
1249         offset = 0;
1250         sdres_tlvs_len = 0;
1251
1252         while (offset < tlv_len) {
1253                 type = tlv[0];
1254                 length = tlv[1];
1255
1256                 switch (type) {
1257                 case LLCP_TLV_SDREQ:
1258                         tid = tlv[2];
1259                         service_name = (char *) &tlv[3];
1260                         service_name_len = length - 1;
1261
1262                         pr_debug("Looking for %.16s\n", service_name);
1263
1264                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1265                             !strncmp(service_name, "urn:nfc:sn:sdp",
1266                                      service_name_len)) {
1267                                 sap = 1;
1268                                 goto add_snl;
1269                         }
1270
1271                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1272                                                           service_name_len);
1273                         if (!llcp_sock) {
1274                                 sap = 0;
1275                                 goto add_snl;
1276                         }
1277
1278                         /*
1279                          * We found a socket but its ssap has not been reserved
1280                          * yet. We need to assign it for good and send a reply.
1281                          * The ssap will be freed when the socket is closed.
1282                          */
1283                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1284                                 atomic_t *client_count;
1285
1286                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1287
1288                                 pr_debug("Reserving %d\n", sap);
1289
1290                                 if (sap == LLCP_SAP_MAX) {
1291                                         sap = 0;
1292                                         goto add_snl;
1293                                 }
1294
1295                                 client_count =
1296                                         &local->local_sdp_cnt[sap -
1297                                                               LLCP_WKS_NUM_SAP];
1298
1299                                 atomic_inc(client_count);
1300
1301                                 llcp_sock->ssap = sap;
1302                                 llcp_sock->reserved_ssap = sap;
1303                         } else {
1304                                 sap = llcp_sock->ssap;
1305                         }
1306
1307                         pr_debug("%p %d\n", llcp_sock, sap);
1308
1309 add_snl:
1310                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1311                         if (sdp == NULL)
1312                                 goto exit;
1313
1314                         sdres_tlvs_len += sdp->tlv_len;
1315                         hlist_add_head(&sdp->node, &llc_sdres_list);
1316                         break;
1317
1318                 case LLCP_TLV_SDRES:
1319                         mutex_lock(&local->sdreq_lock);
1320
1321                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1322
1323                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1324                                 if (sdp->tid != tlv[2])
1325                                         continue;
1326
1327                                 sdp->sap = tlv[3];
1328
1329                                 pr_debug("Found: uri=%s, sap=%d\n",
1330                                          sdp->uri, sdp->sap);
1331
1332                                 hlist_del(&sdp->node);
1333
1334                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1335
1336                                 break;
1337                         }
1338
1339                         mutex_unlock(&local->sdreq_lock);
1340                         break;
1341
1342                 default:
1343                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1344                         break;
1345                 }
1346
1347                 offset += length + 2;
1348                 tlv += length + 2;
1349         }
1350
1351 exit:
1352         if (!hlist_empty(&nl_sdres_list))
1353                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1354
1355         if (!hlist_empty(&llc_sdres_list))
1356                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1357 }
1358
1359 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1360 {
1361         u8 ptype;
1362         u16 pdu_len;
1363         struct sk_buff *new_skb;
1364
1365         if (skb->len <= LLCP_HEADER_SIZE) {
1366                 pr_err("Malformed AGF PDU\n");
1367                 return;
1368         }
1369
1370         skb_pull(skb, LLCP_HEADER_SIZE);
1371
1372         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1373                 pdu_len = skb->data[0] << 8 | skb->data[1];
1374
1375                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1376
1377                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1378                         pr_err("Malformed AGF PDU\n");
1379                         return;
1380                 }
1381
1382                 ptype = nfc_llcp_ptype(skb);
1383
1384                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1385                         goto next;
1386
1387                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1388                 if (new_skb == NULL) {
1389                         pr_err("Could not allocate PDU\n");
1390                         return;
1391                 }
1392
1393                 skb_put_data(new_skb, skb->data, pdu_len);
1394
1395                 nfc_llcp_rx_skb(local, new_skb);
1396
1397                 kfree_skb(new_skb);
1398 next:
1399                 skb_pull(skb, pdu_len);
1400         }
1401 }
1402
1403 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1404 {
1405         u8 dsap, ssap, ptype;
1406
1407         ptype = nfc_llcp_ptype(skb);
1408         dsap = nfc_llcp_dsap(skb);
1409         ssap = nfc_llcp_ssap(skb);
1410
1411         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1412
1413         if (ptype != LLCP_PDU_SYMM)
1414                 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1415                                      skb->data, skb->len, true);
1416
1417         switch (ptype) {
1418         case LLCP_PDU_SYMM:
1419                 pr_debug("SYMM\n");
1420                 break;
1421
1422         case LLCP_PDU_UI:
1423                 pr_debug("UI\n");
1424                 nfc_llcp_recv_ui(local, skb);
1425                 break;
1426
1427         case LLCP_PDU_CONNECT:
1428                 pr_debug("CONNECT\n");
1429                 nfc_llcp_recv_connect(local, skb);
1430                 break;
1431
1432         case LLCP_PDU_DISC:
1433                 pr_debug("DISC\n");
1434                 nfc_llcp_recv_disc(local, skb);
1435                 break;
1436
1437         case LLCP_PDU_CC:
1438                 pr_debug("CC\n");
1439                 nfc_llcp_recv_cc(local, skb);
1440                 break;
1441
1442         case LLCP_PDU_DM:
1443                 pr_debug("DM\n");
1444                 nfc_llcp_recv_dm(local, skb);
1445                 break;
1446
1447         case LLCP_PDU_SNL:
1448                 pr_debug("SNL\n");
1449                 nfc_llcp_recv_snl(local, skb);
1450                 break;
1451
1452         case LLCP_PDU_I:
1453         case LLCP_PDU_RR:
1454         case LLCP_PDU_RNR:
1455                 pr_debug("I frame\n");
1456                 nfc_llcp_recv_hdlc(local, skb);
1457                 break;
1458
1459         case LLCP_PDU_AGF:
1460                 pr_debug("AGF frame\n");
1461                 nfc_llcp_recv_agf(local, skb);
1462                 break;
1463         }
1464 }
1465
1466 static void nfc_llcp_rx_work(struct work_struct *work)
1467 {
1468         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1469                                                     rx_work);
1470         struct sk_buff *skb;
1471
1472         skb = local->rx_pending;
1473         if (skb == NULL) {
1474                 pr_debug("No pending SKB\n");
1475                 return;
1476         }
1477
1478         __net_timestamp(skb);
1479
1480         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1481
1482         nfc_llcp_rx_skb(local, skb);
1483
1484         schedule_work(&local->tx_work);
1485         kfree_skb(local->rx_pending);
1486         local->rx_pending = NULL;
1487 }
1488
1489 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1490 {
1491         local->rx_pending = skb;
1492         del_timer(&local->link_timer);
1493         schedule_work(&local->rx_work);
1494 }
1495
1496 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1497 {
1498         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1499
1500         if (err < 0) {
1501                 pr_err("LLCP PDU receive err %d\n", err);
1502                 return;
1503         }
1504
1505         __nfc_llcp_recv(local, skb);
1506 }
1507
1508 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1509 {
1510         struct nfc_llcp_local *local;
1511
1512         local = nfc_llcp_find_local(dev);
1513         if (local == NULL) {
1514                 kfree_skb(skb);
1515                 return -ENODEV;
1516         }
1517
1518         __nfc_llcp_recv(local, skb);
1519
1520         return 0;
1521 }
1522
1523 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1524 {
1525         struct nfc_llcp_local *local;
1526
1527         local = nfc_llcp_find_local(dev);
1528         if (local == NULL)
1529                 return;
1530
1531         local->remote_miu = LLCP_DEFAULT_MIU;
1532         local->remote_lto = LLCP_DEFAULT_LTO;
1533
1534         /* Close and purge all existing sockets */
1535         nfc_llcp_socket_release(local, true, 0);
1536 }
1537
1538 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1539                         u8 comm_mode, u8 rf_mode)
1540 {
1541         struct nfc_llcp_local *local;
1542
1543         pr_debug("rf mode %d\n", rf_mode);
1544
1545         local = nfc_llcp_find_local(dev);
1546         if (local == NULL)
1547                 return;
1548
1549         local->target_idx = target_idx;
1550         local->comm_mode = comm_mode;
1551         local->rf_mode = rf_mode;
1552
1553         if (rf_mode == NFC_RF_INITIATOR) {
1554                 pr_debug("Queueing Tx work\n");
1555
1556                 schedule_work(&local->tx_work);
1557         } else {
1558                 mod_timer(&local->link_timer,
1559                           jiffies + msecs_to_jiffies(local->remote_lto));
1560         }
1561 }
1562
1563 int nfc_llcp_register_device(struct nfc_dev *ndev)
1564 {
1565         struct nfc_llcp_local *local;
1566
1567         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1568         if (local == NULL)
1569                 return -ENOMEM;
1570
1571         local->dev = ndev;
1572         INIT_LIST_HEAD(&local->list);
1573         kref_init(&local->ref);
1574         mutex_init(&local->sdp_lock);
1575         timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1576
1577         skb_queue_head_init(&local->tx_queue);
1578         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1579
1580         local->rx_pending = NULL;
1581         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1582
1583         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1584
1585         rwlock_init(&local->sockets.lock);
1586         rwlock_init(&local->connecting_sockets.lock);
1587         rwlock_init(&local->raw_sockets.lock);
1588
1589         local->lto = 150; /* 1500 ms */
1590         local->rw = LLCP_MAX_RW;
1591         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1592         local->local_wks = 0x1; /* LLC Link Management */
1593
1594         nfc_llcp_build_gb(local);
1595
1596         local->remote_miu = LLCP_DEFAULT_MIU;
1597         local->remote_lto = LLCP_DEFAULT_LTO;
1598
1599         mutex_init(&local->sdreq_lock);
1600         INIT_HLIST_HEAD(&local->pending_sdreqs);
1601         timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1602         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1603
1604         list_add(&local->list, &llcp_devices);
1605
1606         return 0;
1607 }
1608
1609 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1610 {
1611         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1612
1613         if (local == NULL) {
1614                 pr_debug("No such device\n");
1615                 return;
1616         }
1617
1618         local_cleanup(local);
1619
1620         nfc_llcp_local_put(local);
1621 }
1622
1623 int __init nfc_llcp_init(void)
1624 {
1625         return nfc_llcp_sock_init();
1626 }
1627
1628 void nfc_llcp_exit(void)
1629 {
1630         nfc_llcp_sock_exit();
1631 }