net/nfc/llcp_core.c

   1 /*
   2  * Copyright (C) 2011  Intel Corporation. All rights reserved.
   3  * Copyright (C) 2014 Marvell International Ltd.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
  20
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/list.h>
  24 #include <linux/nfc.h>
  25
  26 #include "nfc.h"
  27 #include "llcp.h"
  28
  29 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
  30
  31 static LIST_HEAD(llcp_devices);
  32
  33 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
  34
  35 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
  36 {
  37         write_lock(&l->lock);
  38         sk_add_node(sk, &l->head);
  39         write_unlock(&l->lock);
  40 }
  41
  42 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
  43 {
  44         write_lock(&l->lock);
  45         sk_del_node_init(sk);
  46         write_unlock(&l->lock);
  47 }
  48
  49 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
  50 {
  51         sock->remote_rw = LLCP_DEFAULT_RW;
  52         sock->remote_miu = LLCP_MAX_MIU + 1;
  53 }
  54
  55 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
  56 {
  57         struct nfc_llcp_local *local = sock->local;
  58         struct sk_buff *s, *tmp;
  59
  60         pr_debug("%p\n", &sock->sk);
  61
  62         skb_queue_purge(&sock->tx_queue);
  63         skb_queue_purge(&sock->tx_pending_queue);
  64
  65         if (local == NULL)
  66                 return;
  67
  68         /* Search for local pending SKBs that are related to this socket */
  69         skb_queue_walk_safe(&local->tx_queue, s, tmp) {
  70                 if (s->sk != &sock->sk)
  71                         continue;
  72
  73                 skb_unlink(s, &local->tx_queue);
  74                 kfree_skb(s);
  75         }
  76 }
  77
  78 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
  79                                     int err)
  80 {
  81         struct sock *sk;
  82         struct hlist_node *tmp;
  83         struct nfc_llcp_sock *llcp_sock;
  84
  85         skb_queue_purge(&local->tx_queue);
  86
  87         write_lock(&local->sockets.lock);
  88
  89         sk_for_each_safe(sk, tmp, &local->sockets.head) {
  90                 llcp_sock = nfc_llcp_sock(sk);
  91
  92                 bh_lock_sock(sk);
  93
  94                 nfc_llcp_socket_purge(llcp_sock);
  95
  96                 if (sk->sk_state == LLCP_CONNECTED)
  97                         nfc_put_device(llcp_sock->dev);
  98
  99                 if (sk->sk_state == LLCP_LISTEN) {
 100                         struct nfc_llcp_sock *lsk, *n;
 101                         struct sock *accept_sk;
 102
 103                         list_for_each_entry_safe(lsk, n,
 104                                                  &llcp_sock->accept_queue,
 105                                                  accept_queue) {
 106                                 accept_sk = &lsk->sk;
 107                                 bh_lock_sock(accept_sk);
 108
 109                                 nfc_llcp_accept_unlink(accept_sk);
 110
 111                                 if (err)
 112                                         accept_sk->sk_err = err;
 113                                 accept_sk->sk_state = LLCP_CLOSED;
 114                                 accept_sk->sk_state_change(sk);
 115
 116                                 bh_unlock_sock(accept_sk);
 117                         }
 118                 }
 119
 120                 if (err)
 121                         sk->sk_err = err;
 122                 sk->sk_state = LLCP_CLOSED;
 123                 sk->sk_state_change(sk);
 124
 125                 bh_unlock_sock(sk);
 126
 127                 sk_del_node_init(sk);
 128         }
 129
 130         write_unlock(&local->sockets.lock);
 131
 132         /* If we still have a device, we keep the RAW sockets alive */
 133         if (device == true)
 134                 return;
 135
 136         write_lock(&local->raw_sockets.lock);
 137
 138         sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
 139                 llcp_sock = nfc_llcp_sock(sk);
 140
 141                 bh_lock_sock(sk);
 142
 143                 nfc_llcp_socket_purge(llcp_sock);
 144
 145                 if (err)
 146                         sk->sk_err = err;
 147                 sk->sk_state = LLCP_CLOSED;
 148                 sk->sk_state_change(sk);
 149
 150                 bh_unlock_sock(sk);
 151
 152                 sk_del_node_init(sk);
 153         }
 154
 155         write_unlock(&local->raw_sockets.lock);
 156 }
 157
 158 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
 159 {
 160         kref_get(&local->ref);
 161
 162         return local;
 163 }
 164
 165 static void local_cleanup(struct nfc_llcp_local *local)
 166 {
 167         nfc_llcp_socket_release(local, false, ENXIO);
 168         del_timer_sync(&local->link_timer);
 169         skb_queue_purge(&local->tx_queue);
 170         cancel_work_sync(&local->tx_work);
 171         cancel_work_sync(&local->rx_work);
 172         cancel_work_sync(&local->timeout_work);
 173         kfree_skb(local->rx_pending);
 174         del_timer_sync(&local->sdreq_timer);
 175         cancel_work_sync(&local->sdreq_timeout_work);
 176         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
 177 }
 178
 179 static void local_release(struct kref *ref)
 180 {
 181         struct nfc_llcp_local *local;
 182
 183         local = container_of(ref, struct nfc_llcp_local, ref);
 184
 185         list_del(&local->list);
 186         local_cleanup(local);
 187         kfree(local);
 188 }
 189
 190 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 191 {
 192         if (local == NULL)
 193                 return 0;
 194
 195         return kref_put(&local->ref, local_release);
 196 }
 197
 198 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 199                                                u8 ssap, u8 dsap)
 200 {
 201         struct sock *sk;
 202         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 203
 204         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 205
 206         if (ssap == 0 && dsap == 0)
 207                 return NULL;
 208
 209         read_lock(&local->sockets.lock);
 210
 211         llcp_sock = NULL;
 212
 213         sk_for_each(sk, &local->sockets.head) {
 214                 tmp_sock = nfc_llcp_sock(sk);
 215
 216                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 217                         llcp_sock = tmp_sock;
 218                         break;
 219                 }
 220         }
 221
 222         read_unlock(&local->sockets.lock);
 223
 224         if (llcp_sock == NULL)
 225                 return NULL;
 226
 227         sock_hold(&llcp_sock->sk);
 228
 229         return llcp_sock;
 230 }
 231
 232 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 233 {
 234         sock_put(&sock->sk);
 235 }
 236
 237 static void nfc_llcp_timeout_work(struct work_struct *work)
 238 {
 239         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 240                                                     timeout_work);
 241
 242         nfc_dep_link_down(local->dev);
 243 }
 244
 245 static void nfc_llcp_symm_timer(struct timer_list *t)
 246 {
 247         struct nfc_llcp_local *local = from_timer(local, t, link_timer);
 248
 249         pr_err("SYMM timeout\n");
 250
 251         schedule_work(&local->timeout_work);
 252 }
 253
 254 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
 255 {
 256         unsigned long time;
 257         HLIST_HEAD(nl_sdres_list);
 258         struct hlist_node *n;
 259         struct nfc_llcp_sdp_tlv *sdp;
 260         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 261                                                     sdreq_timeout_work);
 262
 263         mutex_lock(&local->sdreq_lock);
 264
 265         time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
 266
 267         hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
 268                 if (time_after(sdp->time, time))
 269                         continue;
 270
 271                 sdp->sap = LLCP_SDP_UNBOUND;
 272
 273                 hlist_del(&sdp->node);
 274
 275                 hlist_add_head(&sdp->node, &nl_sdres_list);
 276         }
 277
 278         if (!hlist_empty(&local->pending_sdreqs))
 279                 mod_timer(&local->sdreq_timer,
 280                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
 281
 282         mutex_unlock(&local->sdreq_lock);
 283
 284         if (!hlist_empty(&nl_sdres_list))
 285                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
 286 }
 287
 288 static void nfc_llcp_sdreq_timer(struct timer_list *t)
 289 {
 290         struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
 291
 292         schedule_work(&local->sdreq_timeout_work);
 293 }
 294
 295 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 296 {
 297         struct nfc_llcp_local *local;
 298
 299         list_for_each_entry(local, &llcp_devices, list)
 300                 if (local->dev == dev)
 301                         return local;
 302
 303         pr_debug("No device found\n");
 304
 305         return NULL;
 306 }
 307
 308 static char *wks[] = {
 309         NULL,
 310         NULL, /* SDP */
 311         "urn:nfc:sn:ip",
 312         "urn:nfc:sn:obex",
 313         "urn:nfc:sn:snep",
 314 };
 315
 316 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
 317 {
 318         int sap, num_wks;
 319
 320         pr_debug("%s\n", service_name);
 321
 322         if (service_name == NULL)
 323                 return -EINVAL;
 324
 325         num_wks = ARRAY_SIZE(wks);
 326
 327         for (sap = 0; sap < num_wks; sap++) {
 328                 if (wks[sap] == NULL)
 329                         continue;
 330
 331                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 332                         return sap;
 333         }
 334
 335         return -EINVAL;
 336 }
 337
 338 static
 339 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 340                                             u8 *sn, size_t sn_len)
 341 {
 342         struct sock *sk;
 343         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 344
 345         pr_debug("sn %zd %p\n", sn_len, sn);
 346
 347         if (sn == NULL || sn_len == 0)
 348                 return NULL;
 349
 350         read_lock(&local->sockets.lock);
 351
 352         llcp_sock = NULL;
 353
 354         sk_for_each(sk, &local->sockets.head) {
 355                 tmp_sock = nfc_llcp_sock(sk);
 356
 357                 pr_debug("llcp sock %p\n", tmp_sock);
 358
 359                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 360                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 361                         continue;
 362
 363                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 364                     tmp_sock->sk.sk_state != LLCP_BOUND)
 365                         continue;
 366
 367                 if (tmp_sock->service_name == NULL ||
 368                     tmp_sock->service_name_len == 0)
 369                         continue;
 370
 371                 if (tmp_sock->service_name_len != sn_len)
 372                         continue;
 373
 374                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 375                         llcp_sock = tmp_sock;
 376                         break;
 377                 }
 378         }
 379
 380         read_unlock(&local->sockets.lock);
 381
 382         pr_debug("Found llcp sock %p\n", llcp_sock);
 383
 384         return llcp_sock;
 385 }
 386
 387 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 388                          struct nfc_llcp_sock *sock)
 389 {
 390         mutex_lock(&local->sdp_lock);
 391
 392         if (sock->service_name != NULL && sock->service_name_len > 0) {
 393                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 394                                             sock->service_name_len);
 395
 396                 if (ssap > 0) {
 397                         pr_debug("WKS %d\n", ssap);
 398
 399                         /* This is a WKS, let's check if it's free */
 400                         if (local->local_wks & BIT(ssap)) {
 401                                 mutex_unlock(&local->sdp_lock);
 402
 403                                 return LLCP_SAP_MAX;
 404                         }
 405
 406                         set_bit(ssap, &local->local_wks);
 407                         mutex_unlock(&local->sdp_lock);
 408
 409                         return ssap;
 410                 }
 411
 412                 /*
 413                  * Check if there already is a non WKS socket bound
 414                  * to this service name.
 415                  */
 416                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 417                                           sock->service_name_len) != NULL) {
 418                         mutex_unlock(&local->sdp_lock);
 419
 420                         return LLCP_SAP_MAX;
 421                 }
 422
 423                 mutex_unlock(&local->sdp_lock);
 424
 425                 return LLCP_SDP_UNBOUND;
 426
 427         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 428                 if (!test_bit(sock->ssap, &local->local_wks)) {
 429                         set_bit(sock->ssap, &local->local_wks);
 430                         mutex_unlock(&local->sdp_lock);
 431
 432                         return sock->ssap;
 433                 }
 434         }
 435
 436         mutex_unlock(&local->sdp_lock);
 437
 438         return LLCP_SAP_MAX;
 439 }
 440
 441 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 442 {
 443         u8 local_ssap;
 444
 445         mutex_lock(&local->sdp_lock);
 446
 447         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 448         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 449                 mutex_unlock(&local->sdp_lock);
 450                 return LLCP_SAP_MAX;
 451         }
 452
 453         set_bit(local_ssap, &local->local_sap);
 454
 455         mutex_unlock(&local->sdp_lock);
 456
 457         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 458 }
 459
 460 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 461 {
 462         u8 local_ssap;
 463         unsigned long *sdp;
 464
 465         if (ssap < LLCP_WKS_NUM_SAP) {
 466                 local_ssap = ssap;
 467                 sdp = &local->local_wks;
 468         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 469                 atomic_t *client_cnt;
 470
 471                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 472                 sdp = &local->local_sdp;
 473                 client_cnt = &local->local_sdp_cnt[local_ssap];
 474
 475                 pr_debug("%d clients\n", atomic_read(client_cnt));
 476
 477                 mutex_lock(&local->sdp_lock);
 478
 479                 if (atomic_dec_and_test(client_cnt)) {
 480                         struct nfc_llcp_sock *l_sock;
 481
 482                         pr_debug("No more clients for SAP %d\n", ssap);
 483
 484                         clear_bit(local_ssap, sdp);
 485
 486                         /* Find the listening sock and set it back to UNBOUND */
 487                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 488                         if (l_sock) {
 489                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 490                                 nfc_llcp_sock_put(l_sock);
 491                         }
 492                 }
 493
 494                 mutex_unlock(&local->sdp_lock);
 495
 496                 return;
 497         } else if (ssap < LLCP_MAX_SAP) {
 498                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 499                 sdp = &local->local_sap;
 500         } else {
 501                 return;
 502         }
 503
 504         mutex_lock(&local->sdp_lock);
 505
 506         clear_bit(local_ssap, sdp);
 507
 508         mutex_unlock(&local->sdp_lock);
 509 }
 510
 511 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 512 {
 513         u8 ssap;
 514
 515         mutex_lock(&local->sdp_lock);
 516
 517         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 518         if (ssap == LLCP_SDP_NUM_SAP) {
 519                 mutex_unlock(&local->sdp_lock);
 520
 521                 return LLCP_SAP_MAX;
 522         }
 523
 524         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 525
 526         set_bit(ssap, &local->local_sdp);
 527
 528         mutex_unlock(&local->sdp_lock);
 529
 530         return LLCP_WKS_NUM_SAP + ssap;
 531 }
 532
 533 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 534 {
 535         u8 *gb_cur, version, version_length;
 536         u8 lto_length, wks_length, miux_length;
 537         u8 *version_tlv = NULL, *lto_tlv = NULL,
 538            *wks_tlv = NULL, *miux_tlv = NULL;
 539         __be16 wks = cpu_to_be16(local->local_wks);
 540         u8 gb_len = 0;
 541         int ret = 0;
 542
 543         version = LLCP_VERSION_11;
 544         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 545                                          1, &version_length);
 546         if (!version_tlv) {
 547                 ret = -ENOMEM;
 548                 goto out;
 549         }
 550         gb_len += version_length;
 551
 552         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 553         if (!lto_tlv) {
 554                 ret = -ENOMEM;
 555                 goto out;
 556         }
 557         gb_len += lto_length;
 558
 559         pr_debug("Local wks 0x%lx\n", local->local_wks);
 560         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
 561         if (!wks_tlv) {
 562                 ret = -ENOMEM;
 563                 goto out;
 564         }
 565         gb_len += wks_length;
 566
 567         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 568                                       &miux_length);
 569         if (!miux_tlv) {
 570                 ret = -ENOMEM;
 571                 goto out;
 572         }
 573         gb_len += miux_length;
 574
 575         gb_len += ARRAY_SIZE(llcp_magic);
 576
 577         if (gb_len > NFC_MAX_GT_LEN) {
 578                 ret = -EINVAL;
 579                 goto out;
 580         }
 581
 582         gb_cur = local->gb;
 583
 584         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 585         gb_cur += ARRAY_SIZE(llcp_magic);
 586
 587         memcpy(gb_cur, version_tlv, version_length);
 588         gb_cur += version_length;
 589
 590         memcpy(gb_cur, lto_tlv, lto_length);
 591         gb_cur += lto_length;
 592
 593         memcpy(gb_cur, wks_tlv, wks_length);
 594         gb_cur += wks_length;
 595
 596         memcpy(gb_cur, miux_tlv, miux_length);
 597         gb_cur += miux_length;
 598
 599         local->gb_len = gb_len;
 600
 601 out:
 602         kfree(version_tlv);
 603         kfree(lto_tlv);
 604         kfree(wks_tlv);
 605         kfree(miux_tlv);
 606
 607         return ret;
 608 }
 609
 610 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 611 {
 612         struct nfc_llcp_local *local;
 613
 614         local = nfc_llcp_find_local(dev);
 615         if (local == NULL) {
 616                 *general_bytes_len = 0;
 617                 return NULL;
 618         }
 619
 620         nfc_llcp_build_gb(local);
 621
 622         *general_bytes_len = local->gb_len;
 623
 624         return local->gb;
 625 }
 626
 627 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 628 {
 629         struct nfc_llcp_local *local;
 630
 631         if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
 632                 return -EINVAL;
 633
 634         local = nfc_llcp_find_local(dev);
 635         if (local == NULL) {
 636                 pr_err("No LLCP device\n");
 637                 return -ENODEV;
 638         }
 639
 640         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 641         memcpy(local->remote_gb, gb, gb_len);
 642         local->remote_gb_len = gb_len;
 643
 644         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 645                 pr_err("MAC does not support LLCP\n");
 646                 return -EINVAL;
 647         }
 648
 649         return nfc_llcp_parse_gb_tlv(local,
 650                                      &local->remote_gb[3],
 651                                      local->remote_gb_len - 3);
 652 }
 653
 654 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
 655 {
 656         return (pdu->data[0] & 0xfc) >> 2;
 657 }
 658
 659 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
 660 {
 661         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 662 }
 663
 664 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
 665 {
 666         return pdu->data[1] & 0x3f;
 667 }
 668
 669 static u8 nfc_llcp_ns(struct sk_buff *pdu)
 670 {
 671         return pdu->data[2] >> 4;
 672 }
 673
 674 static u8 nfc_llcp_nr(struct sk_buff *pdu)
 675 {
 676         return pdu->data[2] & 0xf;
 677 }
 678
 679 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 680 {
 681         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 682         sock->send_n = (sock->send_n + 1) % 16;
 683         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 684 }
 685
 686 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 687                                struct sk_buff *skb, u8 direction)
 688 {
 689         struct sk_buff *skb_copy = NULL, *nskb;
 690         struct sock *sk;
 691         u8 *data;
 692
 693         read_lock(&local->raw_sockets.lock);
 694
 695         sk_for_each(sk, &local->raw_sockets.head) {
 696                 if (sk->sk_state != LLCP_BOUND)
 697                         continue;
 698
 699                 if (skb_copy == NULL) {
 700                         skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
 701                                                       GFP_ATOMIC, true);
 702
 703                         if (skb_copy == NULL)
 704                                 continue;
 705
 706                         data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
 707
 708                         data[0] = local->dev ? local->dev->idx : 0xFF;
 709                         data[1] = direction & 0x01;
 710                         data[1] |= (RAW_PAYLOAD_LLCP << 1);
 711                 }
 712
 713                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 714                 if (!nskb)
 715                         continue;
 716
 717                 if (sock_queue_rcv_skb(sk, nskb))
 718                         kfree_skb(nskb);
 719         }
 720
 721         read_unlock(&local->raw_sockets.lock);
 722
 723         kfree_skb(skb_copy);
 724 }
 725
 726 static void nfc_llcp_tx_work(struct work_struct *work)
 727 {
 728         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 729                                                     tx_work);
 730         struct sk_buff *skb;
 731         struct sock *sk;
 732         struct nfc_llcp_sock *llcp_sock;
 733
 734         skb = skb_dequeue(&local->tx_queue);
 735         if (skb != NULL) {
 736                 sk = skb->sk;
 737                 llcp_sock = nfc_llcp_sock(sk);
 738
 739                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 740                         kfree_skb(skb);
 741                         nfc_llcp_send_symm(local->dev);
 742                 } else if (llcp_sock && !llcp_sock->remote_ready) {
 743                         skb_queue_head(&local->tx_queue, skb);
 744                         nfc_llcp_send_symm(local->dev);
 745                 } else {
 746                         struct sk_buff *copy_skb = NULL;
 747                         u8 ptype = nfc_llcp_ptype(skb);
 748                         int ret;
 749
 750                         pr_debug("Sending pending skb\n");
 751                         print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
 752                                              16, 1, skb->data, skb->len, true);
 753
 754                         if (ptype == LLCP_PDU_DISC && sk != NULL &&
 755                             sk->sk_state == LLCP_DISCONNECTING) {
 756                                 nfc_llcp_sock_unlink(&local->sockets, sk);
 757                                 sock_orphan(sk);
 758                                 sock_put(sk);
 759                         }
 760
 761                         if (ptype == LLCP_PDU_I)
 762                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 763
 764                         __net_timestamp(skb);
 765
 766                         nfc_llcp_send_to_raw_sock(local, skb,
 767                                                   NFC_DIRECTION_TX);
 768
 769                         ret = nfc_data_exchange(local->dev, local->target_idx,
 770                                                 skb, nfc_llcp_recv, local);
 771
 772                         if (ret) {
 773                                 kfree_skb(copy_skb);
 774                                 goto out;
 775                         }
 776
 777                         if (ptype == LLCP_PDU_I && copy_skb)
 778                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 779                                                copy_skb);
 780                 }
 781         } else {
 782                 nfc_llcp_send_symm(local->dev);
 783         }
 784
 785 out:
 786         mod_timer(&local->link_timer,
 787                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 788 }
 789
 790 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 791                                                           u8 ssap)
 792 {
 793         struct sock *sk;
 794         struct nfc_llcp_sock *llcp_sock;
 795
 796         read_lock(&local->connecting_sockets.lock);
 797
 798         sk_for_each(sk, &local->connecting_sockets.head) {
 799                 llcp_sock = nfc_llcp_sock(sk);
 800
 801                 if (llcp_sock->ssap == ssap) {
 802                         sock_hold(&llcp_sock->sk);
 803                         goto out;
 804                 }
 805         }
 806
 807         llcp_sock = NULL;
 808
 809 out:
 810         read_unlock(&local->connecting_sockets.lock);
 811
 812         return llcp_sock;
 813 }
 814
 815 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 816                                                   u8 *sn, size_t sn_len)
 817 {
 818         struct nfc_llcp_sock *llcp_sock;
 819
 820         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 821
 822         if (llcp_sock == NULL)
 823                 return NULL;
 824
 825         sock_hold(&llcp_sock->sk);
 826
 827         return llcp_sock;
 828 }
 829
 830 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
 831 {
 832         u8 *tlv = &skb->data[2], type, length;
 833         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 834
 835         while (offset < tlv_array_len) {
 836                 type = tlv[0];
 837                 length = tlv[1];
 838
 839                 pr_debug("type 0x%x length %d\n", type, length);
 840
 841                 if (type == LLCP_TLV_SN) {
 842                         *sn_len = length;
 843                         return &tlv[2];
 844                 }
 845
 846                 offset += length + 2;
 847                 tlv += length + 2;
 848         }
 849
 850         return NULL;
 851 }
 852
 853 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 854                              struct sk_buff *skb)
 855 {
 856         struct nfc_llcp_sock *llcp_sock;
 857         struct nfc_llcp_ui_cb *ui_cb;
 858         u8 dsap, ssap;
 859
 860         dsap = nfc_llcp_dsap(skb);
 861         ssap = nfc_llcp_ssap(skb);
 862
 863         ui_cb = nfc_llcp_ui_skb_cb(skb);
 864         ui_cb->dsap = dsap;
 865         ui_cb->ssap = ssap;
 866
 867         pr_debug("%d %d\n", dsap, ssap);
 868
 869         /* We're looking for a bound socket, not a client one */
 870         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 871         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 872                 return;
 873
 874         /* There is no sequence with UI frames */
 875         skb_pull(skb, LLCP_HEADER_SIZE);
 876         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 877                 /*
 878                  * UI frames will be freed from the socket layer, so we
 879                  * need to keep them alive until someone receives them.
 880                  */
 881                 skb_get(skb);
 882         } else {
 883                 pr_err("Receive queue is full\n");
 884         }
 885
 886         nfc_llcp_sock_put(llcp_sock);
 887 }
 888
 889 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 890                                   struct sk_buff *skb)
 891 {
 892         struct sock *new_sk, *parent;
 893         struct nfc_llcp_sock *sock, *new_sock;
 894         u8 dsap, ssap, reason;
 895
 896         dsap = nfc_llcp_dsap(skb);
 897         ssap = nfc_llcp_ssap(skb);
 898
 899         pr_debug("%d %d\n", dsap, ssap);
 900
 901         if (dsap != LLCP_SAP_SDP) {
 902                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 903                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 904                         reason = LLCP_DM_NOBOUND;
 905                         goto fail;
 906                 }
 907         } else {
 908                 u8 *sn;
 909                 size_t sn_len;
 910
 911                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 912                 if (sn == NULL) {
 913                         reason = LLCP_DM_NOBOUND;
 914                         goto fail;
 915                 }
 916
 917                 pr_debug("Service name length %zu\n", sn_len);
 918
 919                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 920                 if (sock == NULL) {
 921                         reason = LLCP_DM_NOBOUND;
 922                         goto fail;
 923                 }
 924         }
 925
 926         lock_sock(&sock->sk);
 927
 928         parent = &sock->sk;
 929
 930         if (sk_acceptq_is_full(parent)) {
 931                 reason = LLCP_DM_REJ;
 932                 release_sock(&sock->sk);
 933                 sock_put(&sock->sk);
 934                 goto fail;
 935         }
 936
 937         if (sock->ssap == LLCP_SDP_UNBOUND) {
 938                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 939
 940                 pr_debug("First client, reserving %d\n", ssap);
 941
 942                 if (ssap == LLCP_SAP_MAX) {
 943                         reason = LLCP_DM_REJ;
 944                         release_sock(&sock->sk);
 945                         sock_put(&sock->sk);
 946                         goto fail;
 947                 }
 948
 949                 sock->ssap = ssap;
 950         }
 951
 952         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
 953         if (new_sk == NULL) {
 954                 reason = LLCP_DM_REJ;
 955                 release_sock(&sock->sk);
 956                 sock_put(&sock->sk);
 957                 goto fail;
 958         }
 959
 960         new_sock = nfc_llcp_sock(new_sk);
 961         new_sock->dev = local->dev;
 962         new_sock->local = nfc_llcp_local_get(local);
 963         new_sock->rw = sock->rw;
 964         new_sock->miux = sock->miux;
 965         new_sock->nfc_protocol = sock->nfc_protocol;
 966         new_sock->dsap = ssap;
 967         new_sock->target_idx = local->target_idx;
 968         new_sock->parent = parent;
 969         new_sock->ssap = sock->ssap;
 970         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 971                 atomic_t *client_count;
 972
 973                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 974
 975                 client_count =
 976                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 977
 978                 atomic_inc(client_count);
 979                 new_sock->reserved_ssap = sock->ssap;
 980         }
 981
 982         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 983                                       skb->len - LLCP_HEADER_SIZE);
 984
 985         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 986
 987         nfc_llcp_sock_link(&local->sockets, new_sk);
 988
 989         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 990
 991         nfc_get_device(local->dev->idx);
 992
 993         new_sk->sk_state = LLCP_CONNECTED;
 994
 995         /* Wake the listening processes */
 996         parent->sk_data_ready(parent);
 997
 998         /* Send CC */
 999         nfc_llcp_send_cc(new_sock);
1000
1001         release_sock(&sock->sk);
1002         sock_put(&sock->sk);
1003
1004         return;
1005
1006 fail:
1007         /* Send DM */
1008         nfc_llcp_send_dm(local, dsap, ssap, reason);
1009 }
1010
1011 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1012 {
1013         int nr_frames = 0;
1014         struct nfc_llcp_local *local = sock->local;
1015
1016         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1017                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1018                  sock->remote_rw);
1019
1020         /* Try to queue some I frames for transmission */
1021         while (sock->remote_ready &&
1022                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1023                 struct sk_buff *pdu;
1024
1025                 pdu = skb_dequeue(&sock->tx_queue);
1026                 if (pdu == NULL)
1027                         break;
1028
1029                 /* Update N(S)/N(R) */
1030                 nfc_llcp_set_nrns(sock, pdu);
1031
1032                 skb_queue_tail(&local->tx_queue, pdu);
1033                 nr_frames++;
1034         }
1035
1036         return nr_frames;
1037 }
1038
1039 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1040                                struct sk_buff *skb)
1041 {
1042         struct nfc_llcp_sock *llcp_sock;
1043         struct sock *sk;
1044         u8 dsap, ssap, ptype, ns, nr;
1045
1046         ptype = nfc_llcp_ptype(skb);
1047         dsap = nfc_llcp_dsap(skb);
1048         ssap = nfc_llcp_ssap(skb);
1049         ns = nfc_llcp_ns(skb);
1050         nr = nfc_llcp_nr(skb);
1051
1052         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1053
1054         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1055         if (llcp_sock == NULL) {
1056                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1057                 return;
1058         }
1059
1060         sk = &llcp_sock->sk;
1061         lock_sock(sk);
1062         if (sk->sk_state == LLCP_CLOSED) {
1063                 release_sock(sk);
1064                 nfc_llcp_sock_put(llcp_sock);
1065         }
1066
1067         /* Pass the payload upstream */
1068         if (ptype == LLCP_PDU_I) {
1069                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1070
1071                 if (ns == llcp_sock->recv_n)
1072                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1073                 else
1074                         pr_err("Received out of sequence I PDU\n");
1075
1076                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1077                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1078                         /*
1079                          * I frames will be freed from the socket layer, so we
1080                          * need to keep them alive until someone receives them.
1081                          */
1082                         skb_get(skb);
1083                 } else {
1084                         pr_err("Receive queue is full\n");
1085                 }
1086         }
1087
1088         /* Remove skbs from the pending queue */
1089         if (llcp_sock->send_ack_n != nr) {
1090                 struct sk_buff *s, *tmp;
1091                 u8 n;
1092
1093                 llcp_sock->send_ack_n = nr;
1094
1095                 /* Remove and free all skbs until ns == nr */
1096                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1097                         n = nfc_llcp_ns(s);
1098
1099                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1100                         kfree_skb(s);
1101
1102                         if (n == nr)
1103                                 break;
1104                 }
1105
1106                 /* Re-queue the remaining skbs for transmission */
1107                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1108                                             s, tmp) {
1109                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1110                         skb_queue_head(&local->tx_queue, s);
1111                 }
1112         }
1113
1114         if (ptype == LLCP_PDU_RR)
1115                 llcp_sock->remote_ready = true;
1116         else if (ptype == LLCP_PDU_RNR)
1117                 llcp_sock->remote_ready = false;
1118
1119         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1120                 nfc_llcp_send_rr(llcp_sock);
1121
1122         release_sock(sk);
1123         nfc_llcp_sock_put(llcp_sock);
1124 }
1125
1126 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1127                                struct sk_buff *skb)
1128 {
1129         struct nfc_llcp_sock *llcp_sock;
1130         struct sock *sk;
1131         u8 dsap, ssap;
1132
1133         dsap = nfc_llcp_dsap(skb);
1134         ssap = nfc_llcp_ssap(skb);
1135
1136         if ((dsap == 0) && (ssap == 0)) {
1137                 pr_debug("Connection termination");
1138                 nfc_dep_link_down(local->dev);
1139                 return;
1140         }
1141
1142         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1143         if (llcp_sock == NULL) {
1144                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1145                 return;
1146         }
1147
1148         sk = &llcp_sock->sk;
1149         lock_sock(sk);
1150
1151         nfc_llcp_socket_purge(llcp_sock);
1152
1153         if (sk->sk_state == LLCP_CLOSED) {
1154                 release_sock(sk);
1155                 nfc_llcp_sock_put(llcp_sock);
1156         }
1157
1158         if (sk->sk_state == LLCP_CONNECTED) {
1159                 nfc_put_device(local->dev);
1160                 sk->sk_state = LLCP_CLOSED;
1161                 sk->sk_state_change(sk);
1162         }
1163
1164         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1165
1166         release_sock(sk);
1167         nfc_llcp_sock_put(llcp_sock);
1168 }
1169
1170 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1171 {
1172         struct nfc_llcp_sock *llcp_sock;
1173         struct sock *sk;
1174         u8 dsap, ssap;
1175
1176         dsap = nfc_llcp_dsap(skb);
1177         ssap = nfc_llcp_ssap(skb);
1178
1179         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1180         if (llcp_sock == NULL) {
1181                 pr_err("Invalid CC\n");
1182                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1183
1184                 return;
1185         }
1186
1187         sk = &llcp_sock->sk;
1188
1189         /* Unlink from connecting and link to the client array */
1190         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1191         nfc_llcp_sock_link(&local->sockets, sk);
1192         llcp_sock->dsap = ssap;
1193
1194         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1195                                       skb->len - LLCP_HEADER_SIZE);
1196
1197         sk->sk_state = LLCP_CONNECTED;
1198         sk->sk_state_change(sk);
1199
1200         nfc_llcp_sock_put(llcp_sock);
1201 }
1202
1203 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1204 {
1205         struct nfc_llcp_sock *llcp_sock;
1206         struct sock *sk;
1207         u8 dsap, ssap, reason;
1208
1209         dsap = nfc_llcp_dsap(skb);
1210         ssap = nfc_llcp_ssap(skb);
1211         reason = skb->data[2];
1212
1213         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1214
1215         switch (reason) {
1216         case LLCP_DM_NOBOUND:
1217         case LLCP_DM_REJ:
1218                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1219                 break;
1220
1221         default:
1222                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1223                 break;
1224         }
1225
1226         if (llcp_sock == NULL) {
1227                 pr_debug("Already closed\n");
1228                 return;
1229         }
1230
1231         sk = &llcp_sock->sk;
1232
1233         sk->sk_err = ENXIO;
1234         sk->sk_state = LLCP_CLOSED;
1235         sk->sk_state_change(sk);
1236
1237         nfc_llcp_sock_put(llcp_sock);
1238 }
1239
1240 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1241                               struct sk_buff *skb)
1242 {
1243         struct nfc_llcp_sock *llcp_sock;
1244         u8 dsap, ssap, *tlv, type, length, tid, sap;
1245         u16 tlv_len, offset;
1246         char *service_name;
1247         size_t service_name_len;
1248         struct nfc_llcp_sdp_tlv *sdp;
1249         HLIST_HEAD(llc_sdres_list);
1250         size_t sdres_tlvs_len;
1251         HLIST_HEAD(nl_sdres_list);
1252
1253         dsap = nfc_llcp_dsap(skb);
1254         ssap = nfc_llcp_ssap(skb);
1255
1256         pr_debug("%d %d\n", dsap, ssap);
1257
1258         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1259                 pr_err("Wrong SNL SAP\n");
1260                 return;
1261         }
1262
1263         tlv = &skb->data[LLCP_HEADER_SIZE];
1264         tlv_len = skb->len - LLCP_HEADER_SIZE;
1265         offset = 0;
1266         sdres_tlvs_len = 0;
1267
1268         while (offset < tlv_len) {
1269                 type = tlv[0];
1270                 length = tlv[1];
1271
1272                 switch (type) {
1273                 case LLCP_TLV_SDREQ:
1274                         tid = tlv[2];
1275                         service_name = (char *) &tlv[3];
1276                         service_name_len = length - 1;
1277
1278                         pr_debug("Looking for %.16s\n", service_name);
1279
1280                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1281                             !strncmp(service_name, "urn:nfc:sn:sdp",
1282                                      service_name_len)) {
1283                                 sap = 1;
1284                                 goto add_snl;
1285                         }
1286
1287                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1288                                                           service_name_len);
1289                         if (!llcp_sock) {
1290                                 sap = 0;
1291                                 goto add_snl;
1292                         }
1293
1294                         /*
1295                          * We found a socket but its ssap has not been reserved
1296                          * yet. We need to assign it for good and send a reply.
1297                          * The ssap will be freed when the socket is closed.
1298                          */
1299                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1300                                 atomic_t *client_count;
1301
1302                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1303
1304                                 pr_debug("Reserving %d\n", sap);
1305
1306                                 if (sap == LLCP_SAP_MAX) {
1307                                         sap = 0;
1308                                         goto add_snl;
1309                                 }
1310
1311                                 client_count =
1312                                         &local->local_sdp_cnt[sap -
1313                                                               LLCP_WKS_NUM_SAP];
1314
1315                                 atomic_inc(client_count);
1316
1317                                 llcp_sock->ssap = sap;
1318                                 llcp_sock->reserved_ssap = sap;
1319                         } else {
1320                                 sap = llcp_sock->ssap;
1321                         }
1322
1323                         pr_debug("%p %d\n", llcp_sock, sap);
1324
1325 add_snl:
1326                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1327                         if (sdp == NULL)
1328                                 goto exit;
1329
1330                         sdres_tlvs_len += sdp->tlv_len;
1331                         hlist_add_head(&sdp->node, &llc_sdres_list);
1332                         break;
1333
1334                 case LLCP_TLV_SDRES:
1335                         mutex_lock(&local->sdreq_lock);
1336
1337                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1338
1339                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1340                                 if (sdp->tid != tlv[2])
1341                                         continue;
1342
1343                                 sdp->sap = tlv[3];
1344
1345                                 pr_debug("Found: uri=%s, sap=%d\n",
1346                                          sdp->uri, sdp->sap);
1347
1348                                 hlist_del(&sdp->node);
1349
1350                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1351
1352                                 break;
1353                         }
1354
1355                         mutex_unlock(&local->sdreq_lock);
1356                         break;
1357
1358                 default:
1359                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1360                         break;
1361                 }
1362
1363                 offset += length + 2;
1364                 tlv += length + 2;
1365         }
1366
1367 exit:
1368         if (!hlist_empty(&nl_sdres_list))
1369                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1370
1371         if (!hlist_empty(&llc_sdres_list))
1372                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1373 }
1374
1375 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1376 {
1377         u8 ptype;
1378         u16 pdu_len;
1379         struct sk_buff *new_skb;
1380
1381         if (skb->len <= LLCP_HEADER_SIZE) {
1382                 pr_err("Malformed AGF PDU\n");
1383                 return;
1384         }
1385
1386         skb_pull(skb, LLCP_HEADER_SIZE);
1387
1388         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1389                 pdu_len = skb->data[0] << 8 | skb->data[1];
1390
1391                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1392
1393                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1394                         pr_err("Malformed AGF PDU\n");
1395                         return;
1396                 }
1397
1398                 ptype = nfc_llcp_ptype(skb);
1399
1400                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1401                         goto next;
1402
1403                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1404                 if (new_skb == NULL) {
1405                         pr_err("Could not allocate PDU\n");
1406                         return;
1407                 }
1408
1409                 skb_put_data(new_skb, skb->data, pdu_len);
1410
1411                 nfc_llcp_rx_skb(local, new_skb);
1412
1413                 kfree_skb(new_skb);
1414 next:
1415                 skb_pull(skb, pdu_len);
1416         }
1417 }
1418
1419 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1420 {
1421         u8 dsap, ssap, ptype;
1422
1423         ptype = nfc_llcp_ptype(skb);
1424         dsap = nfc_llcp_dsap(skb);
1425         ssap = nfc_llcp_ssap(skb);
1426
1427         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1428
1429         if (ptype != LLCP_PDU_SYMM)
1430                 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1431                                      skb->data, skb->len, true);
1432
1433         switch (ptype) {
1434         case LLCP_PDU_SYMM:
1435                 pr_debug("SYMM\n");
1436                 break;
1437
1438         case LLCP_PDU_UI:
1439                 pr_debug("UI\n");
1440                 nfc_llcp_recv_ui(local, skb);
1441                 break;
1442
1443         case LLCP_PDU_CONNECT:
1444                 pr_debug("CONNECT\n");
1445                 nfc_llcp_recv_connect(local, skb);
1446                 break;
1447
1448         case LLCP_PDU_DISC:
1449                 pr_debug("DISC\n");
1450                 nfc_llcp_recv_disc(local, skb);
1451                 break;
1452
1453         case LLCP_PDU_CC:
1454                 pr_debug("CC\n");
1455                 nfc_llcp_recv_cc(local, skb);
1456                 break;
1457
1458         case LLCP_PDU_DM:
1459                 pr_debug("DM\n");
1460                 nfc_llcp_recv_dm(local, skb);
1461                 break;
1462
1463         case LLCP_PDU_SNL:
1464                 pr_debug("SNL\n");
1465                 nfc_llcp_recv_snl(local, skb);
1466                 break;
1467
1468         case LLCP_PDU_I:
1469         case LLCP_PDU_RR:
1470         case LLCP_PDU_RNR:
1471                 pr_debug("I frame\n");
1472                 nfc_llcp_recv_hdlc(local, skb);
1473                 break;
1474
1475         case LLCP_PDU_AGF:
1476                 pr_debug("AGF frame\n");
1477                 nfc_llcp_recv_agf(local, skb);
1478                 break;
1479         }
1480 }
1481
1482 static void nfc_llcp_rx_work(struct work_struct *work)
1483 {
1484         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1485                                                     rx_work);
1486         struct sk_buff *skb;
1487
1488         skb = local->rx_pending;
1489         if (skb == NULL) {
1490                 pr_debug("No pending SKB\n");
1491                 return;
1492         }
1493
1494         __net_timestamp(skb);
1495
1496         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1497
1498         nfc_llcp_rx_skb(local, skb);
1499
1500         schedule_work(&local->tx_work);
1501         kfree_skb(local->rx_pending);
1502         local->rx_pending = NULL;
1503 }
1504
1505 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1506 {
1507         local->rx_pending = skb;
1508         del_timer(&local->link_timer);
1509         schedule_work(&local->rx_work);
1510 }
1511
1512 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1513 {
1514         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1515
1516         pr_debug("Received an LLCP PDU\n");
1517         if (err < 0) {
1518                 pr_err("err %d\n", err);
1519                 return;
1520         }
1521
1522         __nfc_llcp_recv(local, skb);
1523 }
1524
1525 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1526 {
1527         struct nfc_llcp_local *local;
1528
1529         local = nfc_llcp_find_local(dev);
1530         if (local == NULL) {
1531                 kfree_skb(skb);
1532                 return -ENODEV;
1533         }
1534
1535         __nfc_llcp_recv(local, skb);
1536
1537         return 0;
1538 }
1539
1540 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1541 {
1542         struct nfc_llcp_local *local;
1543
1544         local = nfc_llcp_find_local(dev);
1545         if (local == NULL)
1546                 return;
1547
1548         local->remote_miu = LLCP_DEFAULT_MIU;
1549         local->remote_lto = LLCP_DEFAULT_LTO;
1550
1551         /* Close and purge all existing sockets */
1552         nfc_llcp_socket_release(local, true, 0);
1553 }
1554
1555 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1556                         u8 comm_mode, u8 rf_mode)
1557 {
1558         struct nfc_llcp_local *local;
1559
1560         pr_debug("rf mode %d\n", rf_mode);
1561
1562         local = nfc_llcp_find_local(dev);
1563         if (local == NULL)
1564                 return;
1565
1566         local->target_idx = target_idx;
1567         local->comm_mode = comm_mode;
1568         local->rf_mode = rf_mode;
1569
1570         if (rf_mode == NFC_RF_INITIATOR) {
1571                 pr_debug("Queueing Tx work\n");
1572
1573                 schedule_work(&local->tx_work);
1574         } else {
1575                 mod_timer(&local->link_timer,
1576                           jiffies + msecs_to_jiffies(local->remote_lto));
1577         }
1578 }
1579
1580 int nfc_llcp_register_device(struct nfc_dev *ndev)
1581 {
1582         struct nfc_llcp_local *local;
1583
1584         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1585         if (local == NULL)
1586                 return -ENOMEM;
1587
1588         local->dev = ndev;
1589         INIT_LIST_HEAD(&local->list);
1590         kref_init(&local->ref);
1591         mutex_init(&local->sdp_lock);
1592         timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1593
1594         skb_queue_head_init(&local->tx_queue);
1595         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1596
1597         local->rx_pending = NULL;
1598         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1599
1600         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1601
1602         rwlock_init(&local->sockets.lock);
1603         rwlock_init(&local->connecting_sockets.lock);
1604         rwlock_init(&local->raw_sockets.lock);
1605
1606         local->lto = 150; /* 1500 ms */
1607         local->rw = LLCP_MAX_RW;
1608         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1609         local->local_wks = 0x1; /* LLC Link Management */
1610
1611         nfc_llcp_build_gb(local);
1612
1613         local->remote_miu = LLCP_DEFAULT_MIU;
1614         local->remote_lto = LLCP_DEFAULT_LTO;
1615
1616         mutex_init(&local->sdreq_lock);
1617         INIT_HLIST_HEAD(&local->pending_sdreqs);
1618         timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1619         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1620
1621         list_add(&local->list, &llcp_devices);
1622
1623         return 0;
1624 }
1625
1626 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1627 {
1628         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1629
1630         if (local == NULL) {
1631                 pr_debug("No such device\n");
1632                 return;
1633         }
1634
1635         local_cleanup(local);
1636
1637         nfc_llcp_local_put(local);
1638 }
1639
1640 int __init nfc_llcp_init(void)
1641 {
1642         return nfc_llcp_sock_init();
1643 }
1644
1645 void nfc_llcp_exit(void)
1646 {
1647         nfc_llcp_sock_exit();
1648 }