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         local->rx_pending = NULL;
 175         del_timer_sync(&local->sdreq_timer);
 176         cancel_work_sync(&local->sdreq_timeout_work);
 177         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
 178 }
 179
 180 static void local_release(struct kref *ref)
 181 {
 182         struct nfc_llcp_local *local;
 183
 184         local = container_of(ref, struct nfc_llcp_local, ref);
 185
 186         list_del(&local->list);
 187         local_cleanup(local);
 188         kfree(local);
 189 }
 190
 191 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 192 {
 193         if (local == NULL)
 194                 return 0;
 195
 196         return kref_put(&local->ref, local_release);
 197 }
 198
 199 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 200                                                u8 ssap, u8 dsap)
 201 {
 202         struct sock *sk;
 203         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 204
 205         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 206
 207         if (ssap == 0 && dsap == 0)
 208                 return NULL;
 209
 210         read_lock(&local->sockets.lock);
 211
 212         llcp_sock = NULL;
 213
 214         sk_for_each(sk, &local->sockets.head) {
 215                 tmp_sock = nfc_llcp_sock(sk);
 216
 217                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 218                         llcp_sock = tmp_sock;
 219                         break;
 220                 }
 221         }
 222
 223         read_unlock(&local->sockets.lock);
 224
 225         if (llcp_sock == NULL)
 226                 return NULL;
 227
 228         sock_hold(&llcp_sock->sk);
 229
 230         return llcp_sock;
 231 }
 232
 233 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 234 {
 235         sock_put(&sock->sk);
 236 }
 237
 238 static void nfc_llcp_timeout_work(struct work_struct *work)
 239 {
 240         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 241                                                     timeout_work);
 242
 243         nfc_dep_link_down(local->dev);
 244 }
 245
 246 static void nfc_llcp_symm_timer(struct timer_list *t)
 247 {
 248         struct nfc_llcp_local *local = from_timer(local, t, link_timer);
 249
 250         pr_err("SYMM timeout\n");
 251
 252         schedule_work(&local->timeout_work);
 253 }
 254
 255 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
 256 {
 257         unsigned long time;
 258         HLIST_HEAD(nl_sdres_list);
 259         struct hlist_node *n;
 260         struct nfc_llcp_sdp_tlv *sdp;
 261         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 262                                                     sdreq_timeout_work);
 263
 264         mutex_lock(&local->sdreq_lock);
 265
 266         time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
 267
 268         hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
 269                 if (time_after(sdp->time, time))
 270                         continue;
 271
 272                 sdp->sap = LLCP_SDP_UNBOUND;
 273
 274                 hlist_del(&sdp->node);
 275
 276                 hlist_add_head(&sdp->node, &nl_sdres_list);
 277         }
 278
 279         if (!hlist_empty(&local->pending_sdreqs))
 280                 mod_timer(&local->sdreq_timer,
 281                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
 282
 283         mutex_unlock(&local->sdreq_lock);
 284
 285         if (!hlist_empty(&nl_sdres_list))
 286                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
 287 }
 288
 289 static void nfc_llcp_sdreq_timer(struct timer_list *t)
 290 {
 291         struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
 292
 293         schedule_work(&local->sdreq_timeout_work);
 294 }
 295
 296 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 297 {
 298         struct nfc_llcp_local *local;
 299
 300         list_for_each_entry(local, &llcp_devices, list)
 301                 if (local->dev == dev)
 302                         return local;
 303
 304         pr_debug("No device found\n");
 305
 306         return NULL;
 307 }
 308
 309 static char *wks[] = {
 310         NULL,
 311         NULL, /* SDP */
 312         "urn:nfc:sn:ip",
 313         "urn:nfc:sn:obex",
 314         "urn:nfc:sn:snep",
 315 };
 316
 317 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
 318 {
 319         int sap, num_wks;
 320
 321         pr_debug("%s\n", service_name);
 322
 323         if (service_name == NULL)
 324                 return -EINVAL;
 325
 326         num_wks = ARRAY_SIZE(wks);
 327
 328         for (sap = 0; sap < num_wks; sap++) {
 329                 if (wks[sap] == NULL)
 330                         continue;
 331
 332                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 333                         return sap;
 334         }
 335
 336         return -EINVAL;
 337 }
 338
 339 static
 340 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 341                                             const u8 *sn, size_t sn_len)
 342 {
 343         struct sock *sk;
 344         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 345
 346         pr_debug("sn %zd %p\n", sn_len, sn);
 347
 348         if (sn == NULL || sn_len == 0)
 349                 return NULL;
 350
 351         read_lock(&local->sockets.lock);
 352
 353         llcp_sock = NULL;
 354
 355         sk_for_each(sk, &local->sockets.head) {
 356                 tmp_sock = nfc_llcp_sock(sk);
 357
 358                 pr_debug("llcp sock %p\n", tmp_sock);
 359
 360                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 361                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 362                         continue;
 363
 364                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 365                     tmp_sock->sk.sk_state != LLCP_BOUND)
 366                         continue;
 367
 368                 if (tmp_sock->service_name == NULL ||
 369                     tmp_sock->service_name_len == 0)
 370                         continue;
 371
 372                 if (tmp_sock->service_name_len != sn_len)
 373                         continue;
 374
 375                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 376                         llcp_sock = tmp_sock;
 377                         break;
 378                 }
 379         }
 380
 381         read_unlock(&local->sockets.lock);
 382
 383         pr_debug("Found llcp sock %p\n", llcp_sock);
 384
 385         return llcp_sock;
 386 }
 387
 388 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 389                          struct nfc_llcp_sock *sock)
 390 {
 391         mutex_lock(&local->sdp_lock);
 392
 393         if (sock->service_name != NULL && sock->service_name_len > 0) {
 394                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 395                                             sock->service_name_len);
 396
 397                 if (ssap > 0) {
 398                         pr_debug("WKS %d\n", ssap);
 399
 400                         /* This is a WKS, let's check if it's free */
 401                         if (local->local_wks & BIT(ssap)) {
 402                                 mutex_unlock(&local->sdp_lock);
 403
 404                                 return LLCP_SAP_MAX;
 405                         }
 406
 407                         set_bit(ssap, &local->local_wks);
 408                         mutex_unlock(&local->sdp_lock);
 409
 410                         return ssap;
 411                 }
 412
 413                 /*
 414                  * Check if there already is a non WKS socket bound
 415                  * to this service name.
 416                  */
 417                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 418                                           sock->service_name_len) != NULL) {
 419                         mutex_unlock(&local->sdp_lock);
 420
 421                         return LLCP_SAP_MAX;
 422                 }
 423
 424                 mutex_unlock(&local->sdp_lock);
 425
 426                 return LLCP_SDP_UNBOUND;
 427
 428         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 429                 if (!test_bit(sock->ssap, &local->local_wks)) {
 430                         set_bit(sock->ssap, &local->local_wks);
 431                         mutex_unlock(&local->sdp_lock);
 432
 433                         return sock->ssap;
 434                 }
 435         }
 436
 437         mutex_unlock(&local->sdp_lock);
 438
 439         return LLCP_SAP_MAX;
 440 }
 441
 442 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 443 {
 444         u8 local_ssap;
 445
 446         mutex_lock(&local->sdp_lock);
 447
 448         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 449         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 450                 mutex_unlock(&local->sdp_lock);
 451                 return LLCP_SAP_MAX;
 452         }
 453
 454         set_bit(local_ssap, &local->local_sap);
 455
 456         mutex_unlock(&local->sdp_lock);
 457
 458         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 459 }
 460
 461 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 462 {
 463         u8 local_ssap;
 464         unsigned long *sdp;
 465
 466         if (ssap < LLCP_WKS_NUM_SAP) {
 467                 local_ssap = ssap;
 468                 sdp = &local->local_wks;
 469         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 470                 atomic_t *client_cnt;
 471
 472                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 473                 sdp = &local->local_sdp;
 474                 client_cnt = &local->local_sdp_cnt[local_ssap];
 475
 476                 pr_debug("%d clients\n", atomic_read(client_cnt));
 477
 478                 mutex_lock(&local->sdp_lock);
 479
 480                 if (atomic_dec_and_test(client_cnt)) {
 481                         struct nfc_llcp_sock *l_sock;
 482
 483                         pr_debug("No more clients for SAP %d\n", ssap);
 484
 485                         clear_bit(local_ssap, sdp);
 486
 487                         /* Find the listening sock and set it back to UNBOUND */
 488                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 489                         if (l_sock) {
 490                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 491                                 nfc_llcp_sock_put(l_sock);
 492                         }
 493                 }
 494
 495                 mutex_unlock(&local->sdp_lock);
 496
 497                 return;
 498         } else if (ssap < LLCP_MAX_SAP) {
 499                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 500                 sdp = &local->local_sap;
 501         } else {
 502                 return;
 503         }
 504
 505         mutex_lock(&local->sdp_lock);
 506
 507         clear_bit(local_ssap, sdp);
 508
 509         mutex_unlock(&local->sdp_lock);
 510 }
 511
 512 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 513 {
 514         u8 ssap;
 515
 516         mutex_lock(&local->sdp_lock);
 517
 518         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 519         if (ssap == LLCP_SDP_NUM_SAP) {
 520                 mutex_unlock(&local->sdp_lock);
 521
 522                 return LLCP_SAP_MAX;
 523         }
 524
 525         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 526
 527         set_bit(ssap, &local->local_sdp);
 528
 529         mutex_unlock(&local->sdp_lock);
 530
 531         return LLCP_WKS_NUM_SAP + ssap;
 532 }
 533
 534 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 535 {
 536         u8 *gb_cur, version, version_length;
 537         u8 lto_length, wks_length, miux_length;
 538         const u8 *version_tlv = NULL, *lto_tlv = NULL,
 539            *wks_tlv = NULL, *miux_tlv = NULL;
 540         __be16 wks = cpu_to_be16(local->local_wks);
 541         u8 gb_len = 0;
 542         int ret = 0;
 543
 544         version = LLCP_VERSION_11;
 545         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 546                                          1, &version_length);
 547         if (!version_tlv) {
 548                 ret = -ENOMEM;
 549                 goto out;
 550         }
 551         gb_len += version_length;
 552
 553         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 554         if (!lto_tlv) {
 555                 ret = -ENOMEM;
 556                 goto out;
 557         }
 558         gb_len += lto_length;
 559
 560         pr_debug("Local wks 0x%lx\n", local->local_wks);
 561         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
 562         if (!wks_tlv) {
 563                 ret = -ENOMEM;
 564                 goto out;
 565         }
 566         gb_len += wks_length;
 567
 568         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 569                                       &miux_length);
 570         if (!miux_tlv) {
 571                 ret = -ENOMEM;
 572                 goto out;
 573         }
 574         gb_len += miux_length;
 575
 576         gb_len += ARRAY_SIZE(llcp_magic);
 577
 578         if (gb_len > NFC_MAX_GT_LEN) {
 579                 ret = -EINVAL;
 580                 goto out;
 581         }
 582
 583         gb_cur = local->gb;
 584
 585         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 586         gb_cur += ARRAY_SIZE(llcp_magic);
 587
 588         memcpy(gb_cur, version_tlv, version_length);
 589         gb_cur += version_length;
 590
 591         memcpy(gb_cur, lto_tlv, lto_length);
 592         gb_cur += lto_length;
 593
 594         memcpy(gb_cur, wks_tlv, wks_length);
 595         gb_cur += wks_length;
 596
 597         memcpy(gb_cur, miux_tlv, miux_length);
 598         gb_cur += miux_length;
 599
 600         local->gb_len = gb_len;
 601
 602 out:
 603         kfree(version_tlv);
 604         kfree(lto_tlv);
 605         kfree(wks_tlv);
 606         kfree(miux_tlv);
 607
 608         return ret;
 609 }
 610
 611 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 612 {
 613         struct nfc_llcp_local *local;
 614
 615         local = nfc_llcp_find_local(dev);
 616         if (local == NULL) {
 617                 *general_bytes_len = 0;
 618                 return NULL;
 619         }
 620
 621         nfc_llcp_build_gb(local);
 622
 623         *general_bytes_len = local->gb_len;
 624
 625         return local->gb;
 626 }
 627
 628 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
 629 {
 630         struct nfc_llcp_local *local;
 631
 632         if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
 633                 return -EINVAL;
 634
 635         local = nfc_llcp_find_local(dev);
 636         if (local == NULL) {
 637                 pr_err("No LLCP device\n");
 638                 return -ENODEV;
 639         }
 640
 641         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 642         memcpy(local->remote_gb, gb, gb_len);
 643         local->remote_gb_len = gb_len;
 644
 645         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 646                 pr_err("MAC does not support LLCP\n");
 647                 return -EINVAL;
 648         }
 649
 650         return nfc_llcp_parse_gb_tlv(local,
 651                                      &local->remote_gb[3],
 652                                      local->remote_gb_len - 3);
 653 }
 654
 655 static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
 656 {
 657         return (pdu->data[0] & 0xfc) >> 2;
 658 }
 659
 660 static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
 661 {
 662         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 663 }
 664
 665 static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
 666 {
 667         return pdu->data[1] & 0x3f;
 668 }
 669
 670 static u8 nfc_llcp_ns(const struct sk_buff *pdu)
 671 {
 672         return pdu->data[2] >> 4;
 673 }
 674
 675 static u8 nfc_llcp_nr(const struct sk_buff *pdu)
 676 {
 677         return pdu->data[2] & 0xf;
 678 }
 679
 680 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 681 {
 682         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 683         sock->send_n = (sock->send_n + 1) % 16;
 684         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 685 }
 686
 687 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 688                                struct sk_buff *skb, u8 direction)
 689 {
 690         struct sk_buff *skb_copy = NULL, *nskb;
 691         struct sock *sk;
 692         u8 *data;
 693
 694         read_lock(&local->raw_sockets.lock);
 695
 696         sk_for_each(sk, &local->raw_sockets.head) {
 697                 if (sk->sk_state != LLCP_BOUND)
 698                         continue;
 699
 700                 if (skb_copy == NULL) {
 701                         skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
 702                                                       GFP_ATOMIC, true);
 703
 704                         if (skb_copy == NULL)
 705                                 continue;
 706
 707                         data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
 708
 709                         data[0] = local->dev ? local->dev->idx : 0xFF;
 710                         data[1] = direction & 0x01;
 711                         data[1] |= (RAW_PAYLOAD_LLCP << 1);
 712                 }
 713
 714                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 715                 if (!nskb)
 716                         continue;
 717
 718                 if (sock_queue_rcv_skb(sk, nskb))
 719                         kfree_skb(nskb);
 720         }
 721
 722         read_unlock(&local->raw_sockets.lock);
 723
 724         kfree_skb(skb_copy);
 725 }
 726
 727 static void nfc_llcp_tx_work(struct work_struct *work)
 728 {
 729         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 730                                                     tx_work);
 731         struct sk_buff *skb;
 732         struct sock *sk;
 733         struct nfc_llcp_sock *llcp_sock;
 734
 735         skb = skb_dequeue(&local->tx_queue);
 736         if (skb != NULL) {
 737                 sk = skb->sk;
 738                 llcp_sock = nfc_llcp_sock(sk);
 739
 740                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 741                         kfree_skb(skb);
 742                         nfc_llcp_send_symm(local->dev);
 743                 } else if (llcp_sock && !llcp_sock->remote_ready) {
 744                         skb_queue_head(&local->tx_queue, skb);
 745                         nfc_llcp_send_symm(local->dev);
 746                 } else {
 747                         struct sk_buff *copy_skb = NULL;
 748                         u8 ptype = nfc_llcp_ptype(skb);
 749                         int ret;
 750
 751                         pr_debug("Sending pending skb\n");
 752                         print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
 753                                              16, 1, skb->data, skb->len, true);
 754
 755                         if (ptype == LLCP_PDU_DISC && sk != NULL &&
 756                             sk->sk_state == LLCP_DISCONNECTING) {
 757                                 nfc_llcp_sock_unlink(&local->sockets, sk);
 758                                 sock_orphan(sk);
 759                                 sock_put(sk);
 760                         }
 761
 762                         if (ptype == LLCP_PDU_I)
 763                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 764
 765                         __net_timestamp(skb);
 766
 767                         nfc_llcp_send_to_raw_sock(local, skb,
 768                                                   NFC_DIRECTION_TX);
 769
 770                         ret = nfc_data_exchange(local->dev, local->target_idx,
 771                                                 skb, nfc_llcp_recv, local);
 772
 773                         if (ret) {
 774                                 kfree_skb(copy_skb);
 775                                 goto out;
 776                         }
 777
 778                         if (ptype == LLCP_PDU_I && copy_skb)
 779                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 780                                                copy_skb);
 781                 }
 782         } else {
 783                 nfc_llcp_send_symm(local->dev);
 784         }
 785
 786 out:
 787         mod_timer(&local->link_timer,
 788                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 789 }
 790
 791 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 792                                                           u8 ssap)
 793 {
 794         struct sock *sk;
 795         struct nfc_llcp_sock *llcp_sock;
 796
 797         read_lock(&local->connecting_sockets.lock);
 798
 799         sk_for_each(sk, &local->connecting_sockets.head) {
 800                 llcp_sock = nfc_llcp_sock(sk);
 801
 802                 if (llcp_sock->ssap == ssap) {
 803                         sock_hold(&llcp_sock->sk);
 804                         goto out;
 805                 }
 806         }
 807
 808         llcp_sock = NULL;
 809
 810 out:
 811         read_unlock(&local->connecting_sockets.lock);
 812
 813         return llcp_sock;
 814 }
 815
 816 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 817                                                   const u8 *sn, size_t sn_len)
 818 {
 819         struct nfc_llcp_sock *llcp_sock;
 820
 821         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 822
 823         if (llcp_sock == NULL)
 824                 return NULL;
 825
 826         sock_hold(&llcp_sock->sk);
 827
 828         return llcp_sock;
 829 }
 830
 831 static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
 832 {
 833         u8 type, length;
 834         const u8 *tlv = &skb->data[2];
 835         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 836
 837         while (offset < tlv_array_len) {
 838                 type = tlv[0];
 839                 length = tlv[1];
 840
 841                 pr_debug("type 0x%x length %d\n", type, length);
 842
 843                 if (type == LLCP_TLV_SN) {
 844                         *sn_len = length;
 845                         return &tlv[2];
 846                 }
 847
 848                 offset += length + 2;
 849                 tlv += length + 2;
 850         }
 851
 852         return NULL;
 853 }
 854
 855 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 856                              struct sk_buff *skb)
 857 {
 858         struct nfc_llcp_sock *llcp_sock;
 859         struct nfc_llcp_ui_cb *ui_cb;
 860         u8 dsap, ssap;
 861
 862         dsap = nfc_llcp_dsap(skb);
 863         ssap = nfc_llcp_ssap(skb);
 864
 865         ui_cb = nfc_llcp_ui_skb_cb(skb);
 866         ui_cb->dsap = dsap;
 867         ui_cb->ssap = ssap;
 868
 869         pr_debug("%d %d\n", dsap, ssap);
 870
 871         /* We're looking for a bound socket, not a client one */
 872         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 873         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 874                 return;
 875
 876         /* There is no sequence with UI frames */
 877         skb_pull(skb, LLCP_HEADER_SIZE);
 878         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 879                 /*
 880                  * UI frames will be freed from the socket layer, so we
 881                  * need to keep them alive until someone receives them.
 882                  */
 883                 skb_get(skb);
 884         } else {
 885                 pr_err("Receive queue is full\n");
 886         }
 887
 888         nfc_llcp_sock_put(llcp_sock);
 889 }
 890
 891 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 892                                   const struct sk_buff *skb)
 893 {
 894         struct sock *new_sk, *parent;
 895         struct nfc_llcp_sock *sock, *new_sock;
 896         u8 dsap, ssap, reason;
 897
 898         dsap = nfc_llcp_dsap(skb);
 899         ssap = nfc_llcp_ssap(skb);
 900
 901         pr_debug("%d %d\n", dsap, ssap);
 902
 903         if (dsap != LLCP_SAP_SDP) {
 904                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 905                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 906                         reason = LLCP_DM_NOBOUND;
 907                         goto fail;
 908                 }
 909         } else {
 910                 const u8 *sn;
 911                 size_t sn_len;
 912
 913                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 914                 if (sn == NULL) {
 915                         reason = LLCP_DM_NOBOUND;
 916                         goto fail;
 917                 }
 918
 919                 pr_debug("Service name length %zu\n", sn_len);
 920
 921                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 922                 if (sock == NULL) {
 923                         reason = LLCP_DM_NOBOUND;
 924                         goto fail;
 925                 }
 926         }
 927
 928         lock_sock(&sock->sk);
 929
 930         parent = &sock->sk;
 931
 932         if (sk_acceptq_is_full(parent)) {
 933                 reason = LLCP_DM_REJ;
 934                 release_sock(&sock->sk);
 935                 sock_put(&sock->sk);
 936                 goto fail;
 937         }
 938
 939         if (sock->ssap == LLCP_SDP_UNBOUND) {
 940                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 941
 942                 pr_debug("First client, reserving %d\n", ssap);
 943
 944                 if (ssap == LLCP_SAP_MAX) {
 945                         reason = LLCP_DM_REJ;
 946                         release_sock(&sock->sk);
 947                         sock_put(&sock->sk);
 948                         goto fail;
 949                 }
 950
 951                 sock->ssap = ssap;
 952         }
 953
 954         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
 955         if (new_sk == NULL) {
 956                 reason = LLCP_DM_REJ;
 957                 release_sock(&sock->sk);
 958                 sock_put(&sock->sk);
 959                 goto fail;
 960         }
 961
 962         new_sock = nfc_llcp_sock(new_sk);
 963         new_sock->dev = local->dev;
 964         new_sock->local = nfc_llcp_local_get(local);
 965         new_sock->rw = sock->rw;
 966         new_sock->miux = sock->miux;
 967         new_sock->nfc_protocol = sock->nfc_protocol;
 968         new_sock->dsap = ssap;
 969         new_sock->target_idx = local->target_idx;
 970         new_sock->parent = parent;
 971         new_sock->ssap = sock->ssap;
 972         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 973                 atomic_t *client_count;
 974
 975                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 976
 977                 client_count =
 978                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 979
 980                 atomic_inc(client_count);
 981                 new_sock->reserved_ssap = sock->ssap;
 982         }
 983
 984         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 985                                       skb->len - LLCP_HEADER_SIZE);
 986
 987         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 988
 989         nfc_llcp_sock_link(&local->sockets, new_sk);
 990
 991         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 992
 993         nfc_get_device(local->dev->idx);
 994
 995         new_sk->sk_state = LLCP_CONNECTED;
 996
 997         /* Wake the listening processes */
 998         parent->sk_data_ready(parent);
 999
1000         /* Send CC */
1001         nfc_llcp_send_cc(new_sock);
1002
1003         release_sock(&sock->sk);
1004         sock_put(&sock->sk);
1005
1006         return;
1007
1008 fail:
1009         /* Send DM */
1010         nfc_llcp_send_dm(local, dsap, ssap, reason);
1011 }
1012
1013 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1014 {
1015         int nr_frames = 0;
1016         struct nfc_llcp_local *local = sock->local;
1017
1018         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1019                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1020                  sock->remote_rw);
1021
1022         /* Try to queue some I frames for transmission */
1023         while (sock->remote_ready &&
1024                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1025                 struct sk_buff *pdu;
1026
1027                 pdu = skb_dequeue(&sock->tx_queue);
1028                 if (pdu == NULL)
1029                         break;
1030
1031                 /* Update N(S)/N(R) */
1032                 nfc_llcp_set_nrns(sock, pdu);
1033
1034                 skb_queue_tail(&local->tx_queue, pdu);
1035                 nr_frames++;
1036         }
1037
1038         return nr_frames;
1039 }
1040
1041 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1042                                struct sk_buff *skb)
1043 {
1044         struct nfc_llcp_sock *llcp_sock;
1045         struct sock *sk;
1046         u8 dsap, ssap, ptype, ns, nr;
1047
1048         ptype = nfc_llcp_ptype(skb);
1049         dsap = nfc_llcp_dsap(skb);
1050         ssap = nfc_llcp_ssap(skb);
1051         ns = nfc_llcp_ns(skb);
1052         nr = nfc_llcp_nr(skb);
1053
1054         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1055
1056         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1057         if (llcp_sock == NULL) {
1058                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1059                 return;
1060         }
1061
1062         sk = &llcp_sock->sk;
1063         lock_sock(sk);
1064         if (sk->sk_state == LLCP_CLOSED) {
1065                 release_sock(sk);
1066                 nfc_llcp_sock_put(llcp_sock);
1067         }
1068
1069         /* Pass the payload upstream */
1070         if (ptype == LLCP_PDU_I) {
1071                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1072
1073                 if (ns == llcp_sock->recv_n)
1074                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1075                 else
1076                         pr_err("Received out of sequence I PDU\n");
1077
1078                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1079                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1080                         /*
1081                          * I frames will be freed from the socket layer, so we
1082                          * need to keep them alive until someone receives them.
1083                          */
1084                         skb_get(skb);
1085                 } else {
1086                         pr_err("Receive queue is full\n");
1087                 }
1088         }
1089
1090         /* Remove skbs from the pending queue */
1091         if (llcp_sock->send_ack_n != nr) {
1092                 struct sk_buff *s, *tmp;
1093                 u8 n;
1094
1095                 llcp_sock->send_ack_n = nr;
1096
1097                 /* Remove and free all skbs until ns == nr */
1098                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1099                         n = nfc_llcp_ns(s);
1100
1101                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1102                         kfree_skb(s);
1103
1104                         if (n == nr)
1105                                 break;
1106                 }
1107
1108                 /* Re-queue the remaining skbs for transmission */
1109                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1110                                             s, tmp) {
1111                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1112                         skb_queue_head(&local->tx_queue, s);
1113                 }
1114         }
1115
1116         if (ptype == LLCP_PDU_RR)
1117                 llcp_sock->remote_ready = true;
1118         else if (ptype == LLCP_PDU_RNR)
1119                 llcp_sock->remote_ready = false;
1120
1121         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1122                 nfc_llcp_send_rr(llcp_sock);
1123
1124         release_sock(sk);
1125         nfc_llcp_sock_put(llcp_sock);
1126 }
1127
1128 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1129                                const struct sk_buff *skb)
1130 {
1131         struct nfc_llcp_sock *llcp_sock;
1132         struct sock *sk;
1133         u8 dsap, ssap;
1134
1135         dsap = nfc_llcp_dsap(skb);
1136         ssap = nfc_llcp_ssap(skb);
1137
1138         if ((dsap == 0) && (ssap == 0)) {
1139                 pr_debug("Connection termination");
1140                 nfc_dep_link_down(local->dev);
1141                 return;
1142         }
1143
1144         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1145         if (llcp_sock == NULL) {
1146                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1147                 return;
1148         }
1149
1150         sk = &llcp_sock->sk;
1151         lock_sock(sk);
1152
1153         nfc_llcp_socket_purge(llcp_sock);
1154
1155         if (sk->sk_state == LLCP_CLOSED) {
1156                 release_sock(sk);
1157                 nfc_llcp_sock_put(llcp_sock);
1158         }
1159
1160         if (sk->sk_state == LLCP_CONNECTED) {
1161                 nfc_put_device(local->dev);
1162                 sk->sk_state = LLCP_CLOSED;
1163                 sk->sk_state_change(sk);
1164         }
1165
1166         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1167
1168         release_sock(sk);
1169         nfc_llcp_sock_put(llcp_sock);
1170 }
1171
1172 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
1173                              const struct sk_buff *skb)
1174 {
1175         struct nfc_llcp_sock *llcp_sock;
1176         struct sock *sk;
1177         u8 dsap, ssap;
1178
1179         dsap = nfc_llcp_dsap(skb);
1180         ssap = nfc_llcp_ssap(skb);
1181
1182         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1183         if (llcp_sock == NULL) {
1184                 pr_err("Invalid CC\n");
1185                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1186
1187                 return;
1188         }
1189
1190         sk = &llcp_sock->sk;
1191
1192         /* Unlink from connecting and link to the client array */
1193         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1194         nfc_llcp_sock_link(&local->sockets, sk);
1195         llcp_sock->dsap = ssap;
1196
1197         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1198                                       skb->len - LLCP_HEADER_SIZE);
1199
1200         sk->sk_state = LLCP_CONNECTED;
1201         sk->sk_state_change(sk);
1202
1203         nfc_llcp_sock_put(llcp_sock);
1204 }
1205
1206 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
1207                              const struct sk_buff *skb)
1208 {
1209         struct nfc_llcp_sock *llcp_sock;
1210         struct sock *sk;
1211         u8 dsap, ssap, reason;
1212
1213         dsap = nfc_llcp_dsap(skb);
1214         ssap = nfc_llcp_ssap(skb);
1215         reason = skb->data[2];
1216
1217         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1218
1219         switch (reason) {
1220         case LLCP_DM_NOBOUND:
1221         case LLCP_DM_REJ:
1222                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1223                 break;
1224
1225         default:
1226                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1227                 break;
1228         }
1229
1230         if (llcp_sock == NULL) {
1231                 pr_debug("Already closed\n");
1232                 return;
1233         }
1234
1235         sk = &llcp_sock->sk;
1236
1237         sk->sk_err = ENXIO;
1238         sk->sk_state = LLCP_CLOSED;
1239         sk->sk_state_change(sk);
1240
1241         nfc_llcp_sock_put(llcp_sock);
1242 }
1243
1244 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1245                               const struct sk_buff *skb)
1246 {
1247         struct nfc_llcp_sock *llcp_sock;
1248         u8 dsap, ssap, type, length, tid, sap;
1249         const u8 *tlv;
1250         u16 tlv_len, offset;
1251         const char *service_name;
1252         size_t service_name_len;
1253         struct nfc_llcp_sdp_tlv *sdp;
1254         HLIST_HEAD(llc_sdres_list);
1255         size_t sdres_tlvs_len;
1256         HLIST_HEAD(nl_sdres_list);
1257
1258         dsap = nfc_llcp_dsap(skb);
1259         ssap = nfc_llcp_ssap(skb);
1260
1261         pr_debug("%d %d\n", dsap, ssap);
1262
1263         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1264                 pr_err("Wrong SNL SAP\n");
1265                 return;
1266         }
1267
1268         tlv = &skb->data[LLCP_HEADER_SIZE];
1269         tlv_len = skb->len - LLCP_HEADER_SIZE;
1270         offset = 0;
1271         sdres_tlvs_len = 0;
1272
1273         while (offset < tlv_len) {
1274                 type = tlv[0];
1275                 length = tlv[1];
1276
1277                 switch (type) {
1278                 case LLCP_TLV_SDREQ:
1279                         tid = tlv[2];
1280                         service_name = (char *) &tlv[3];
1281                         service_name_len = length - 1;
1282
1283                         pr_debug("Looking for %.16s\n", service_name);
1284
1285                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1286                             !strncmp(service_name, "urn:nfc:sn:sdp",
1287                                      service_name_len)) {
1288                                 sap = 1;
1289                                 goto add_snl;
1290                         }
1291
1292                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1293                                                           service_name_len);
1294                         if (!llcp_sock) {
1295                                 sap = 0;
1296                                 goto add_snl;
1297                         }
1298
1299                         /*
1300                          * We found a socket but its ssap has not been reserved
1301                          * yet. We need to assign it for good and send a reply.
1302                          * The ssap will be freed when the socket is closed.
1303                          */
1304                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1305                                 atomic_t *client_count;
1306
1307                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1308
1309                                 pr_debug("Reserving %d\n", sap);
1310
1311                                 if (sap == LLCP_SAP_MAX) {
1312                                         sap = 0;
1313                                         goto add_snl;
1314                                 }
1315
1316                                 client_count =
1317                                         &local->local_sdp_cnt[sap -
1318                                                               LLCP_WKS_NUM_SAP];
1319
1320                                 atomic_inc(client_count);
1321
1322                                 llcp_sock->ssap = sap;
1323                                 llcp_sock->reserved_ssap = sap;
1324                         } else {
1325                                 sap = llcp_sock->ssap;
1326                         }
1327
1328                         pr_debug("%p %d\n", llcp_sock, sap);
1329
1330 add_snl:
1331                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1332                         if (sdp == NULL)
1333                                 goto exit;
1334
1335                         sdres_tlvs_len += sdp->tlv_len;
1336                         hlist_add_head(&sdp->node, &llc_sdres_list);
1337                         break;
1338
1339                 case LLCP_TLV_SDRES:
1340                         mutex_lock(&local->sdreq_lock);
1341
1342                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1343
1344                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1345                                 if (sdp->tid != tlv[2])
1346                                         continue;
1347
1348                                 sdp->sap = tlv[3];
1349
1350                                 pr_debug("Found: uri=%s, sap=%d\n",
1351                                          sdp->uri, sdp->sap);
1352
1353                                 hlist_del(&sdp->node);
1354
1355                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1356
1357                                 break;
1358                         }
1359
1360                         mutex_unlock(&local->sdreq_lock);
1361                         break;
1362
1363                 default:
1364                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1365                         break;
1366                 }
1367
1368                 offset += length + 2;
1369                 tlv += length + 2;
1370         }
1371
1372 exit:
1373         if (!hlist_empty(&nl_sdres_list))
1374                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1375
1376         if (!hlist_empty(&llc_sdres_list))
1377                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1378 }
1379
1380 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1381 {
1382         u8 ptype;
1383         u16 pdu_len;
1384         struct sk_buff *new_skb;
1385
1386         if (skb->len <= LLCP_HEADER_SIZE) {
1387                 pr_err("Malformed AGF PDU\n");
1388                 return;
1389         }
1390
1391         skb_pull(skb, LLCP_HEADER_SIZE);
1392
1393         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1394                 pdu_len = skb->data[0] << 8 | skb->data[1];
1395
1396                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1397
1398                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1399                         pr_err("Malformed AGF PDU\n");
1400                         return;
1401                 }
1402
1403                 ptype = nfc_llcp_ptype(skb);
1404
1405                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1406                         goto next;
1407
1408                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1409                 if (new_skb == NULL) {
1410                         pr_err("Could not allocate PDU\n");
1411                         return;
1412                 }
1413
1414                 skb_put_data(new_skb, skb->data, pdu_len);
1415
1416                 nfc_llcp_rx_skb(local, new_skb);
1417
1418                 kfree_skb(new_skb);
1419 next:
1420                 skb_pull(skb, pdu_len);
1421         }
1422 }
1423
1424 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1425 {
1426         u8 dsap, ssap, ptype;
1427
1428         ptype = nfc_llcp_ptype(skb);
1429         dsap = nfc_llcp_dsap(skb);
1430         ssap = nfc_llcp_ssap(skb);
1431
1432         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1433
1434         if (ptype != LLCP_PDU_SYMM)
1435                 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1436                                      skb->data, skb->len, true);
1437
1438         switch (ptype) {
1439         case LLCP_PDU_SYMM:
1440                 pr_debug("SYMM\n");
1441                 break;
1442
1443         case LLCP_PDU_UI:
1444                 pr_debug("UI\n");
1445                 nfc_llcp_recv_ui(local, skb);
1446                 break;
1447
1448         case LLCP_PDU_CONNECT:
1449                 pr_debug("CONNECT\n");
1450                 nfc_llcp_recv_connect(local, skb);
1451                 break;
1452
1453         case LLCP_PDU_DISC:
1454                 pr_debug("DISC\n");
1455                 nfc_llcp_recv_disc(local, skb);
1456                 break;
1457
1458         case LLCP_PDU_CC:
1459                 pr_debug("CC\n");
1460                 nfc_llcp_recv_cc(local, skb);
1461                 break;
1462
1463         case LLCP_PDU_DM:
1464                 pr_debug("DM\n");
1465                 nfc_llcp_recv_dm(local, skb);
1466                 break;
1467
1468         case LLCP_PDU_SNL:
1469                 pr_debug("SNL\n");
1470                 nfc_llcp_recv_snl(local, skb);
1471                 break;
1472
1473         case LLCP_PDU_I:
1474         case LLCP_PDU_RR:
1475         case LLCP_PDU_RNR:
1476                 pr_debug("I frame\n");
1477                 nfc_llcp_recv_hdlc(local, skb);
1478                 break;
1479
1480         case LLCP_PDU_AGF:
1481                 pr_debug("AGF frame\n");
1482                 nfc_llcp_recv_agf(local, skb);
1483                 break;
1484         }
1485 }
1486
1487 static void nfc_llcp_rx_work(struct work_struct *work)
1488 {
1489         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1490                                                     rx_work);
1491         struct sk_buff *skb;
1492
1493         skb = local->rx_pending;
1494         if (skb == NULL) {
1495                 pr_debug("No pending SKB\n");
1496                 return;
1497         }
1498
1499         __net_timestamp(skb);
1500
1501         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1502
1503         nfc_llcp_rx_skb(local, skb);
1504
1505         schedule_work(&local->tx_work);
1506         kfree_skb(local->rx_pending);
1507         local->rx_pending = NULL;
1508 }
1509
1510 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1511 {
1512         local->rx_pending = skb;
1513         del_timer(&local->link_timer);
1514         schedule_work(&local->rx_work);
1515 }
1516
1517 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1518 {
1519         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1520
1521         pr_debug("Received an LLCP PDU\n");
1522         if (err < 0) {
1523                 pr_err("err %d\n", err);
1524                 return;
1525         }
1526
1527         __nfc_llcp_recv(local, skb);
1528 }
1529
1530 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1531 {
1532         struct nfc_llcp_local *local;
1533
1534         local = nfc_llcp_find_local(dev);
1535         if (local == NULL) {
1536                 kfree_skb(skb);
1537                 return -ENODEV;
1538         }
1539
1540         __nfc_llcp_recv(local, skb);
1541
1542         return 0;
1543 }
1544
1545 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1546 {
1547         struct nfc_llcp_local *local;
1548
1549         local = nfc_llcp_find_local(dev);
1550         if (local == NULL)
1551                 return;
1552
1553         local->remote_miu = LLCP_DEFAULT_MIU;
1554         local->remote_lto = LLCP_DEFAULT_LTO;
1555
1556         /* Close and purge all existing sockets */
1557         nfc_llcp_socket_release(local, true, 0);
1558 }
1559
1560 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1561                         u8 comm_mode, u8 rf_mode)
1562 {
1563         struct nfc_llcp_local *local;
1564
1565         pr_debug("rf mode %d\n", rf_mode);
1566
1567         local = nfc_llcp_find_local(dev);
1568         if (local == NULL)
1569                 return;
1570
1571         local->target_idx = target_idx;
1572         local->comm_mode = comm_mode;
1573         local->rf_mode = rf_mode;
1574
1575         if (rf_mode == NFC_RF_INITIATOR) {
1576                 pr_debug("Queueing Tx work\n");
1577
1578                 schedule_work(&local->tx_work);
1579         } else {
1580                 mod_timer(&local->link_timer,
1581                           jiffies + msecs_to_jiffies(local->remote_lto));
1582         }
1583 }
1584
1585 int nfc_llcp_register_device(struct nfc_dev *ndev)
1586 {
1587         struct nfc_llcp_local *local;
1588
1589         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1590         if (local == NULL)
1591                 return -ENOMEM;
1592
1593         local->dev = ndev;
1594         INIT_LIST_HEAD(&local->list);
1595         kref_init(&local->ref);
1596         mutex_init(&local->sdp_lock);
1597         timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1598
1599         skb_queue_head_init(&local->tx_queue);
1600         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1601
1602         local->rx_pending = NULL;
1603         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1604
1605         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1606
1607         rwlock_init(&local->sockets.lock);
1608         rwlock_init(&local->connecting_sockets.lock);
1609         rwlock_init(&local->raw_sockets.lock);
1610
1611         local->lto = 150; /* 1500 ms */
1612         local->rw = LLCP_MAX_RW;
1613         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1614         local->local_wks = 0x1; /* LLC Link Management */
1615
1616         nfc_llcp_build_gb(local);
1617
1618         local->remote_miu = LLCP_DEFAULT_MIU;
1619         local->remote_lto = LLCP_DEFAULT_LTO;
1620
1621         mutex_init(&local->sdreq_lock);
1622         INIT_HLIST_HEAD(&local->pending_sdreqs);
1623         timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1624         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1625
1626         list_add(&local->list, &llcp_devices);
1627
1628         return 0;
1629 }
1630
1631 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1632 {
1633         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1634
1635         if (local == NULL) {
1636                 pr_debug("No such device\n");
1637                 return;
1638         }
1639
1640         local_cleanup(local);
1641
1642         nfc_llcp_local_put(local);
1643 }
1644
1645 int __init nfc_llcp_init(void)
1646 {
1647         return nfc_llcp_sock_init();
1648 }
1649
1650 void nfc_llcp_exit(void)
1651 {
1652         nfc_llcp_sock_exit();
1653 }