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(unsigned long data)
 246 {
 247         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 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(unsigned long data)
 289 {
 290         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
 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(KERN_DEBUG, "LLCP Tx: ",
 752                                        DUMP_PREFIX_OFFSET, 16, 1,
 753                                        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                                                   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 u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
 832 {
 833         u8 *tlv = &skb->data[2], type, length;
 834         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 835
 836         while (offset < tlv_array_len) {
 837                 type = tlv[0];
 838                 length = tlv[1];
 839
 840                 pr_debug("type 0x%x length %d\n", type, length);
 841
 842                 if (type == LLCP_TLV_SN) {
 843                         *sn_len = length;
 844                         return &tlv[2];
 845                 }
 846
 847                 offset += length + 2;
 848                 tlv += length + 2;
 849         }
 850
 851         return NULL;
 852 }
 853
 854 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 855                              struct sk_buff *skb)
 856 {
 857         struct nfc_llcp_sock *llcp_sock;
 858         struct nfc_llcp_ui_cb *ui_cb;
 859         u8 dsap, ssap;
 860
 861         dsap = nfc_llcp_dsap(skb);
 862         ssap = nfc_llcp_ssap(skb);
 863
 864         ui_cb = nfc_llcp_ui_skb_cb(skb);
 865         ui_cb->dsap = dsap;
 866         ui_cb->ssap = ssap;
 867
 868         pr_debug("%d %d\n", dsap, ssap);
 869
 870         /* We're looking for a bound socket, not a client one */
 871         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 872         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 873                 return;
 874
 875         /* There is no sequence with UI frames */
 876         skb_pull(skb, LLCP_HEADER_SIZE);
 877         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 878                 /*
 879                  * UI frames will be freed from the socket layer, so we
 880                  * need to keep them alive until someone receives them.
 881                  */
 882                 skb_get(skb);
 883         } else {
 884                 pr_err("Receive queue is full\n");
 885         }
 886
 887         nfc_llcp_sock_put(llcp_sock);
 888 }
 889
 890 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 891                                   struct sk_buff *skb)
 892 {
 893         struct sock *new_sk, *parent;
 894         struct nfc_llcp_sock *sock, *new_sock;
 895         u8 dsap, ssap, reason;
 896
 897         dsap = nfc_llcp_dsap(skb);
 898         ssap = nfc_llcp_ssap(skb);
 899
 900         pr_debug("%d %d\n", dsap, ssap);
 901
 902         if (dsap != LLCP_SAP_SDP) {
 903                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 904                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 905                         reason = LLCP_DM_NOBOUND;
 906                         goto fail;
 907                 }
 908         } else {
 909                 u8 *sn;
 910                 size_t sn_len;
 911
 912                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 913                 if (sn == NULL) {
 914                         reason = LLCP_DM_NOBOUND;
 915                         goto fail;
 916                 }
 917
 918                 pr_debug("Service name length %zu\n", sn_len);
 919
 920                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 921                 if (sock == NULL) {
 922                         reason = LLCP_DM_NOBOUND;
 923                         goto fail;
 924                 }
 925         }
 926
 927         lock_sock(&sock->sk);
 928
 929         parent = &sock->sk;
 930
 931         if (sk_acceptq_is_full(parent)) {
 932                 reason = LLCP_DM_REJ;
 933                 release_sock(&sock->sk);
 934                 sock_put(&sock->sk);
 935                 goto fail;
 936         }
 937
 938         if (sock->ssap == LLCP_SDP_UNBOUND) {
 939                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 940
 941                 pr_debug("First client, reserving %d\n", ssap);
 942
 943                 if (ssap == LLCP_SAP_MAX) {
 944                         reason = LLCP_DM_REJ;
 945                         release_sock(&sock->sk);
 946                         sock_put(&sock->sk);
 947                         goto fail;
 948                 }
 949
 950                 sock->ssap = ssap;
 951         }
 952
 953         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
 954         if (new_sk == NULL) {
 955                 reason = LLCP_DM_REJ;
 956                 release_sock(&sock->sk);
 957                 sock_put(&sock->sk);
 958                 goto fail;
 959         }
 960
 961         new_sock = nfc_llcp_sock(new_sk);
 962         new_sock->dev = local->dev;
 963         new_sock->local = nfc_llcp_local_get(local);
 964         new_sock->rw = sock->rw;
 965         new_sock->miux = sock->miux;
 966         new_sock->nfc_protocol = sock->nfc_protocol;
 967         new_sock->dsap = ssap;
 968         new_sock->target_idx = local->target_idx;
 969         new_sock->parent = parent;
 970         new_sock->ssap = sock->ssap;
 971         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 972                 atomic_t *client_count;
 973
 974                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 975
 976                 client_count =
 977                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 978
 979                 atomic_inc(client_count);
 980                 new_sock->reserved_ssap = sock->ssap;
 981         }
 982
 983         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 984                                       skb->len - LLCP_HEADER_SIZE);
 985
 986         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 987
 988         nfc_llcp_sock_link(&local->sockets, new_sk);
 989
 990         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 991
 992         nfc_get_device(local->dev->idx);
 993
 994         new_sk->sk_state = LLCP_CONNECTED;
 995
 996         /* Wake the listening processes */
 997         parent->sk_data_ready(parent);
 998
 999         /* Send CC */
1000         nfc_llcp_send_cc(new_sock);
1001
1002         release_sock(&sock->sk);
1003         sock_put(&sock->sk);
1004
1005         return;
1006
1007 fail:
1008         /* Send DM */
1009         nfc_llcp_send_dm(local, dsap, ssap, reason);
1010 }
1011
1012 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1013 {
1014         int nr_frames = 0;
1015         struct nfc_llcp_local *local = sock->local;
1016
1017         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1018                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1019                  sock->remote_rw);
1020
1021         /* Try to queue some I frames for transmission */
1022         while (sock->remote_ready &&
1023                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1024                 struct sk_buff *pdu;
1025
1026                 pdu = skb_dequeue(&sock->tx_queue);
1027                 if (pdu == NULL)
1028                         break;
1029
1030                 /* Update N(S)/N(R) */
1031                 nfc_llcp_set_nrns(sock, pdu);
1032
1033                 skb_queue_tail(&local->tx_queue, pdu);
1034                 nr_frames++;
1035         }
1036
1037         return nr_frames;
1038 }
1039
1040 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1041                                struct sk_buff *skb)
1042 {
1043         struct nfc_llcp_sock *llcp_sock;
1044         struct sock *sk;
1045         u8 dsap, ssap, ptype, ns, nr;
1046
1047         ptype = nfc_llcp_ptype(skb);
1048         dsap = nfc_llcp_dsap(skb);
1049         ssap = nfc_llcp_ssap(skb);
1050         ns = nfc_llcp_ns(skb);
1051         nr = nfc_llcp_nr(skb);
1052
1053         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1054
1055         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1056         if (llcp_sock == NULL) {
1057                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1058                 return;
1059         }
1060
1061         sk = &llcp_sock->sk;
1062         lock_sock(sk);
1063         if (sk->sk_state == LLCP_CLOSED) {
1064                 release_sock(sk);
1065                 nfc_llcp_sock_put(llcp_sock);
1066         }
1067
1068         /* Pass the payload upstream */
1069         if (ptype == LLCP_PDU_I) {
1070                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1071
1072                 if (ns == llcp_sock->recv_n)
1073                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1074                 else
1075                         pr_err("Received out of sequence I PDU\n");
1076
1077                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1078                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1079                         /*
1080                          * I frames will be freed from the socket layer, so we
1081                          * need to keep them alive until someone receives them.
1082                          */
1083                         skb_get(skb);
1084                 } else {
1085                         pr_err("Receive queue is full\n");
1086                 }
1087         }
1088
1089         /* Remove skbs from the pending queue */
1090         if (llcp_sock->send_ack_n != nr) {
1091                 struct sk_buff *s, *tmp;
1092                 u8 n;
1093
1094                 llcp_sock->send_ack_n = nr;
1095
1096                 /* Remove and free all skbs until ns == nr */
1097                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1098                         n = nfc_llcp_ns(s);
1099
1100                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1101                         kfree_skb(s);
1102
1103                         if (n == nr)
1104                                 break;
1105                 }
1106
1107                 /* Re-queue the remaining skbs for transmission */
1108                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1109                                             s, tmp) {
1110                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1111                         skb_queue_head(&local->tx_queue, s);
1112                 }
1113         }
1114
1115         if (ptype == LLCP_PDU_RR)
1116                 llcp_sock->remote_ready = true;
1117         else if (ptype == LLCP_PDU_RNR)
1118                 llcp_sock->remote_ready = false;
1119
1120         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1121                 nfc_llcp_send_rr(llcp_sock);
1122
1123         release_sock(sk);
1124         nfc_llcp_sock_put(llcp_sock);
1125 }
1126
1127 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1128                                struct sk_buff *skb)
1129 {
1130         struct nfc_llcp_sock *llcp_sock;
1131         struct sock *sk;
1132         u8 dsap, ssap;
1133
1134         dsap = nfc_llcp_dsap(skb);
1135         ssap = nfc_llcp_ssap(skb);
1136
1137         if ((dsap == 0) && (ssap == 0)) {
1138                 pr_debug("Connection termination");
1139                 nfc_dep_link_down(local->dev);
1140                 return;
1141         }
1142
1143         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1144         if (llcp_sock == NULL) {
1145                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1146                 return;
1147         }
1148
1149         sk = &llcp_sock->sk;
1150         lock_sock(sk);
1151
1152         nfc_llcp_socket_purge(llcp_sock);
1153
1154         if (sk->sk_state == LLCP_CLOSED) {
1155                 release_sock(sk);
1156                 nfc_llcp_sock_put(llcp_sock);
1157         }
1158
1159         if (sk->sk_state == LLCP_CONNECTED) {
1160                 nfc_put_device(local->dev);
1161                 sk->sk_state = LLCP_CLOSED;
1162                 sk->sk_state_change(sk);
1163         }
1164
1165         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1166
1167         release_sock(sk);
1168         nfc_llcp_sock_put(llcp_sock);
1169 }
1170
1171 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1172 {
1173         struct nfc_llcp_sock *llcp_sock;
1174         struct sock *sk;
1175         u8 dsap, ssap;
1176
1177         dsap = nfc_llcp_dsap(skb);
1178         ssap = nfc_llcp_ssap(skb);
1179
1180         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1181         if (llcp_sock == NULL) {
1182                 pr_err("Invalid CC\n");
1183                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1184
1185                 return;
1186         }
1187
1188         sk = &llcp_sock->sk;
1189
1190         /* Unlink from connecting and link to the client array */
1191         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1192         nfc_llcp_sock_link(&local->sockets, sk);
1193         llcp_sock->dsap = ssap;
1194
1195         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1196                                       skb->len - LLCP_HEADER_SIZE);
1197
1198         sk->sk_state = LLCP_CONNECTED;
1199         sk->sk_state_change(sk);
1200
1201         nfc_llcp_sock_put(llcp_sock);
1202 }
1203
1204 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1205 {
1206         struct nfc_llcp_sock *llcp_sock;
1207         struct sock *sk;
1208         u8 dsap, ssap, reason;
1209
1210         dsap = nfc_llcp_dsap(skb);
1211         ssap = nfc_llcp_ssap(skb);
1212         reason = skb->data[2];
1213
1214         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1215
1216         switch (reason) {
1217         case LLCP_DM_NOBOUND:
1218         case LLCP_DM_REJ:
1219                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1220                 break;
1221
1222         default:
1223                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1224                 break;
1225         }
1226
1227         if (llcp_sock == NULL) {
1228                 pr_debug("Already closed\n");
1229                 return;
1230         }
1231
1232         sk = &llcp_sock->sk;
1233
1234         sk->sk_err = ENXIO;
1235         sk->sk_state = LLCP_CLOSED;
1236         sk->sk_state_change(sk);
1237
1238         nfc_llcp_sock_put(llcp_sock);
1239 }
1240
1241 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1242                               struct sk_buff *skb)
1243 {
1244         struct nfc_llcp_sock *llcp_sock;
1245         u8 dsap, ssap, *tlv, type, length, tid, sap;
1246         u16 tlv_len, offset;
1247         char *service_name;
1248         size_t service_name_len;
1249         struct nfc_llcp_sdp_tlv *sdp;
1250         HLIST_HEAD(llc_sdres_list);
1251         size_t sdres_tlvs_len;
1252         HLIST_HEAD(nl_sdres_list);
1253
1254         dsap = nfc_llcp_dsap(skb);
1255         ssap = nfc_llcp_ssap(skb);
1256
1257         pr_debug("%d %d\n", dsap, ssap);
1258
1259         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1260                 pr_err("Wrong SNL SAP\n");
1261                 return;
1262         }
1263
1264         tlv = &skb->data[LLCP_HEADER_SIZE];
1265         tlv_len = skb->len - LLCP_HEADER_SIZE;
1266         offset = 0;
1267         sdres_tlvs_len = 0;
1268
1269         while (offset < tlv_len) {
1270                 type = tlv[0];
1271                 length = tlv[1];
1272
1273                 switch (type) {
1274                 case LLCP_TLV_SDREQ:
1275                         tid = tlv[2];
1276                         service_name = (char *) &tlv[3];
1277                         service_name_len = length - 1;
1278
1279                         pr_debug("Looking for %.16s\n", service_name);
1280
1281                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1282                             !strncmp(service_name, "urn:nfc:sn:sdp",
1283                                      service_name_len)) {
1284                                 sap = 1;
1285                                 goto add_snl;
1286                         }
1287
1288                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1289                                                           service_name_len);
1290                         if (!llcp_sock) {
1291                                 sap = 0;
1292                                 goto add_snl;
1293                         }
1294
1295                         /*
1296                          * We found a socket but its ssap has not been reserved
1297                          * yet. We need to assign it for good and send a reply.
1298                          * The ssap will be freed when the socket is closed.
1299                          */
1300                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1301                                 atomic_t *client_count;
1302
1303                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1304
1305                                 pr_debug("Reserving %d\n", sap);
1306
1307                                 if (sap == LLCP_SAP_MAX) {
1308                                         sap = 0;
1309                                         goto add_snl;
1310                                 }
1311
1312                                 client_count =
1313                                         &local->local_sdp_cnt[sap -
1314                                                               LLCP_WKS_NUM_SAP];
1315
1316                                 atomic_inc(client_count);
1317
1318                                 llcp_sock->ssap = sap;
1319                                 llcp_sock->reserved_ssap = sap;
1320                         } else {
1321                                 sap = llcp_sock->ssap;
1322                         }
1323
1324                         pr_debug("%p %d\n", llcp_sock, sap);
1325
1326 add_snl:
1327                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1328                         if (sdp == NULL)
1329                                 goto exit;
1330
1331                         sdres_tlvs_len += sdp->tlv_len;
1332                         hlist_add_head(&sdp->node, &llc_sdres_list);
1333                         break;
1334
1335                 case LLCP_TLV_SDRES:
1336                         mutex_lock(&local->sdreq_lock);
1337
1338                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1339
1340                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1341                                 if (sdp->tid != tlv[2])
1342                                         continue;
1343
1344                                 sdp->sap = tlv[3];
1345
1346                                 pr_debug("Found: uri=%s, sap=%d\n",
1347                                          sdp->uri, sdp->sap);
1348
1349                                 hlist_del(&sdp->node);
1350
1351                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1352
1353                                 break;
1354                         }
1355
1356                         mutex_unlock(&local->sdreq_lock);
1357                         break;
1358
1359                 default:
1360                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1361                         break;
1362                 }
1363
1364                 offset += length + 2;
1365                 tlv += length + 2;
1366         }
1367
1368 exit:
1369         if (!hlist_empty(&nl_sdres_list))
1370                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1371
1372         if (!hlist_empty(&llc_sdres_list))
1373                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1374 }
1375
1376 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1377 {
1378         u8 ptype;
1379         u16 pdu_len;
1380         struct sk_buff *new_skb;
1381
1382         if (skb->len <= LLCP_HEADER_SIZE) {
1383                 pr_err("Malformed AGF PDU\n");
1384                 return;
1385         }
1386
1387         skb_pull(skb, LLCP_HEADER_SIZE);
1388
1389         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1390                 pdu_len = skb->data[0] << 8 | skb->data[1];
1391
1392                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1393
1394                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1395                         pr_err("Malformed AGF PDU\n");
1396                         return;
1397                 }
1398
1399                 ptype = nfc_llcp_ptype(skb);
1400
1401                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1402                         goto next;
1403
1404                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1405                 if (new_skb == NULL) {
1406                         pr_err("Could not allocate PDU\n");
1407                         return;
1408                 }
1409
1410                 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1411
1412                 nfc_llcp_rx_skb(local, new_skb);
1413
1414                 kfree_skb(new_skb);
1415 next:
1416                 skb_pull(skb, pdu_len);
1417         }
1418 }
1419
1420 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1421 {
1422         u8 dsap, ssap, ptype;
1423
1424         ptype = nfc_llcp_ptype(skb);
1425         dsap = nfc_llcp_dsap(skb);
1426         ssap = nfc_llcp_ssap(skb);
1427
1428         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1429
1430         if (ptype != LLCP_PDU_SYMM)
1431                 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1432                                16, 1, skb->data, skb->len, true);
1433
1434         switch (ptype) {
1435         case LLCP_PDU_SYMM:
1436                 pr_debug("SYMM\n");
1437                 break;
1438
1439         case LLCP_PDU_UI:
1440                 pr_debug("UI\n");
1441                 nfc_llcp_recv_ui(local, skb);
1442                 break;
1443
1444         case LLCP_PDU_CONNECT:
1445                 pr_debug("CONNECT\n");
1446                 nfc_llcp_recv_connect(local, skb);
1447                 break;
1448
1449         case LLCP_PDU_DISC:
1450                 pr_debug("DISC\n");
1451                 nfc_llcp_recv_disc(local, skb);
1452                 break;
1453
1454         case LLCP_PDU_CC:
1455                 pr_debug("CC\n");
1456                 nfc_llcp_recv_cc(local, skb);
1457                 break;
1458
1459         case LLCP_PDU_DM:
1460                 pr_debug("DM\n");
1461                 nfc_llcp_recv_dm(local, skb);
1462                 break;
1463
1464         case LLCP_PDU_SNL:
1465                 pr_debug("SNL\n");
1466                 nfc_llcp_recv_snl(local, skb);
1467                 break;
1468
1469         case LLCP_PDU_I:
1470         case LLCP_PDU_RR:
1471         case LLCP_PDU_RNR:
1472                 pr_debug("I frame\n");
1473                 nfc_llcp_recv_hdlc(local, skb);
1474                 break;
1475
1476         case LLCP_PDU_AGF:
1477                 pr_debug("AGF frame\n");
1478                 nfc_llcp_recv_agf(local, skb);
1479                 break;
1480         }
1481 }
1482
1483 static void nfc_llcp_rx_work(struct work_struct *work)
1484 {
1485         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1486                                                     rx_work);
1487         struct sk_buff *skb;
1488
1489         skb = local->rx_pending;
1490         if (skb == NULL) {
1491                 pr_debug("No pending SKB\n");
1492                 return;
1493         }
1494
1495         __net_timestamp(skb);
1496
1497         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1498
1499         nfc_llcp_rx_skb(local, skb);
1500
1501         schedule_work(&local->tx_work);
1502         kfree_skb(local->rx_pending);
1503         local->rx_pending = NULL;
1504 }
1505
1506 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1507 {
1508         local->rx_pending = skb;
1509         del_timer(&local->link_timer);
1510         schedule_work(&local->rx_work);
1511 }
1512
1513 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1514 {
1515         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1516
1517         pr_debug("Received an LLCP PDU\n");
1518         if (err < 0) {
1519                 pr_err("err %d\n", err);
1520                 return;
1521         }
1522
1523         __nfc_llcp_recv(local, skb);
1524 }
1525
1526 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1527 {
1528         struct nfc_llcp_local *local;
1529
1530         local = nfc_llcp_find_local(dev);
1531         if (local == NULL) {
1532                 kfree_skb(skb);
1533                 return -ENODEV;
1534         }
1535
1536         __nfc_llcp_recv(local, skb);
1537
1538         return 0;
1539 }
1540
1541 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1542 {
1543         struct nfc_llcp_local *local;
1544
1545         local = nfc_llcp_find_local(dev);
1546         if (local == NULL)
1547                 return;
1548
1549         local->remote_miu = LLCP_DEFAULT_MIU;
1550         local->remote_lto = LLCP_DEFAULT_LTO;
1551
1552         /* Close and purge all existing sockets */
1553         nfc_llcp_socket_release(local, true, 0);
1554 }
1555
1556 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1557                         u8 comm_mode, u8 rf_mode)
1558 {
1559         struct nfc_llcp_local *local;
1560
1561         pr_debug("rf mode %d\n", rf_mode);
1562
1563         local = nfc_llcp_find_local(dev);
1564         if (local == NULL)
1565                 return;
1566
1567         local->target_idx = target_idx;
1568         local->comm_mode = comm_mode;
1569         local->rf_mode = rf_mode;
1570
1571         if (rf_mode == NFC_RF_INITIATOR) {
1572                 pr_debug("Queueing Tx work\n");
1573
1574                 schedule_work(&local->tx_work);
1575         } else {
1576                 mod_timer(&local->link_timer,
1577                           jiffies + msecs_to_jiffies(local->remote_lto));
1578         }
1579 }
1580
1581 int nfc_llcp_register_device(struct nfc_dev *ndev)
1582 {
1583         struct nfc_llcp_local *local;
1584
1585         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1586         if (local == NULL)
1587                 return -ENOMEM;
1588
1589         local->dev = ndev;
1590         INIT_LIST_HEAD(&local->list);
1591         kref_init(&local->ref);
1592         mutex_init(&local->sdp_lock);
1593         init_timer(&local->link_timer);
1594         local->link_timer.data = (unsigned long) local;
1595         local->link_timer.function = nfc_llcp_symm_timer;
1596
1597         skb_queue_head_init(&local->tx_queue);
1598         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1599
1600         local->rx_pending = NULL;
1601         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1602
1603         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1604
1605         rwlock_init(&local->sockets.lock);
1606         rwlock_init(&local->connecting_sockets.lock);
1607         rwlock_init(&local->raw_sockets.lock);
1608
1609         local->lto = 150; /* 1500 ms */
1610         local->rw = LLCP_MAX_RW;
1611         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1612         local->local_wks = 0x1; /* LLC Link Management */
1613
1614         nfc_llcp_build_gb(local);
1615
1616         local->remote_miu = LLCP_DEFAULT_MIU;
1617         local->remote_lto = LLCP_DEFAULT_LTO;
1618
1619         mutex_init(&local->sdreq_lock);
1620         INIT_HLIST_HEAD(&local->pending_sdreqs);
1621         init_timer(&local->sdreq_timer);
1622         local->sdreq_timer.data = (unsigned long) local;
1623         local->sdreq_timer.function = nfc_llcp_sdreq_timer;
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 }