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_tlv, version, version_length;
 536         u8 *lto_tlv, lto_length;
 537         u8 *wks_tlv, wks_length;
 538         u8 *miux_tlv, miux_length;
 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         gb_len += version_length;
 547
 548         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 549         gb_len += lto_length;
 550
 551         pr_debug("Local wks 0x%lx\n", local->local_wks);
 552         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
 553         gb_len += wks_length;
 554
 555         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 556                                       &miux_length);
 557         gb_len += miux_length;
 558
 559         gb_len += ARRAY_SIZE(llcp_magic);
 560
 561         if (gb_len > NFC_MAX_GT_LEN) {
 562                 ret = -EINVAL;
 563                 goto out;
 564         }
 565
 566         gb_cur = local->gb;
 567
 568         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 569         gb_cur += ARRAY_SIZE(llcp_magic);
 570
 571         memcpy(gb_cur, version_tlv, version_length);
 572         gb_cur += version_length;
 573
 574         memcpy(gb_cur, lto_tlv, lto_length);
 575         gb_cur += lto_length;
 576
 577         memcpy(gb_cur, wks_tlv, wks_length);
 578         gb_cur += wks_length;
 579
 580         memcpy(gb_cur, miux_tlv, miux_length);
 581         gb_cur += miux_length;
 582
 583         local->gb_len = gb_len;
 584
 585 out:
 586         kfree(version_tlv);
 587         kfree(lto_tlv);
 588         kfree(wks_tlv);
 589         kfree(miux_tlv);
 590
 591         return ret;
 592 }
 593
 594 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 595 {
 596         struct nfc_llcp_local *local;
 597
 598         local = nfc_llcp_find_local(dev);
 599         if (local == NULL) {
 600                 *general_bytes_len = 0;
 601                 return NULL;
 602         }
 603
 604         nfc_llcp_build_gb(local);
 605
 606         *general_bytes_len = local->gb_len;
 607
 608         return local->gb;
 609 }
 610
 611 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 612 {
 613         struct nfc_llcp_local *local;
 614
 615         if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
 616                 return -EINVAL;
 617
 618         local = nfc_llcp_find_local(dev);
 619         if (local == NULL) {
 620                 pr_err("No LLCP device\n");
 621                 return -ENODEV;
 622         }
 623
 624         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 625         memcpy(local->remote_gb, gb, gb_len);
 626         local->remote_gb_len = gb_len;
 627
 628         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 629                 pr_err("MAC does not support LLCP\n");
 630                 return -EINVAL;
 631         }
 632
 633         return nfc_llcp_parse_gb_tlv(local,
 634                                      &local->remote_gb[3],
 635                                      local->remote_gb_len - 3);
 636 }
 637
 638 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
 639 {
 640         return (pdu->data[0] & 0xfc) >> 2;
 641 }
 642
 643 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
 644 {
 645         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 646 }
 647
 648 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
 649 {
 650         return pdu->data[1] & 0x3f;
 651 }
 652
 653 static u8 nfc_llcp_ns(struct sk_buff *pdu)
 654 {
 655         return pdu->data[2] >> 4;
 656 }
 657
 658 static u8 nfc_llcp_nr(struct sk_buff *pdu)
 659 {
 660         return pdu->data[2] & 0xf;
 661 }
 662
 663 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 664 {
 665         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 666         sock->send_n = (sock->send_n + 1) % 16;
 667         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 668 }
 669
 670 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 671                                struct sk_buff *skb, u8 direction)
 672 {
 673         struct sk_buff *skb_copy = NULL, *nskb;
 674         struct sock *sk;
 675         u8 *data;
 676
 677         read_lock(&local->raw_sockets.lock);
 678
 679         sk_for_each(sk, &local->raw_sockets.head) {
 680                 if (sk->sk_state != LLCP_BOUND)
 681                         continue;
 682
 683                 if (skb_copy == NULL) {
 684                         skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
 685                                                       GFP_ATOMIC, true);
 686
 687                         if (skb_copy == NULL)
 688                                 continue;
 689
 690                         data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
 691
 692                         data[0] = local->dev ? local->dev->idx : 0xFF;
 693                         data[1] = direction & 0x01;
 694                         data[1] |= (RAW_PAYLOAD_LLCP << 1);
 695                 }
 696
 697                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 698                 if (!nskb)
 699                         continue;
 700
 701                 if (sock_queue_rcv_skb(sk, nskb))
 702                         kfree_skb(nskb);
 703         }
 704
 705         read_unlock(&local->raw_sockets.lock);
 706
 707         kfree_skb(skb_copy);
 708 }
 709
 710 static void nfc_llcp_tx_work(struct work_struct *work)
 711 {
 712         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 713                                                     tx_work);
 714         struct sk_buff *skb;
 715         struct sock *sk;
 716         struct nfc_llcp_sock *llcp_sock;
 717
 718         skb = skb_dequeue(&local->tx_queue);
 719         if (skb != NULL) {
 720                 sk = skb->sk;
 721                 llcp_sock = nfc_llcp_sock(sk);
 722
 723                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 724                         kfree_skb(skb);
 725                         nfc_llcp_send_symm(local->dev);
 726                 } else if (llcp_sock && !llcp_sock->remote_ready) {
 727                         skb_queue_head(&local->tx_queue, skb);
 728                         nfc_llcp_send_symm(local->dev);
 729                 } else {
 730                         struct sk_buff *copy_skb = NULL;
 731                         u8 ptype = nfc_llcp_ptype(skb);
 732                         int ret;
 733
 734                         pr_debug("Sending pending skb\n");
 735                         print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
 736                                              16, 1, skb->data, skb->len, true);
 737
 738                         if (ptype == LLCP_PDU_DISC && sk != NULL &&
 739                             sk->sk_state == LLCP_DISCONNECTING) {
 740                                 nfc_llcp_sock_unlink(&local->sockets, sk);
 741                                 sock_orphan(sk);
 742                                 sock_put(sk);
 743                         }
 744
 745                         if (ptype == LLCP_PDU_I)
 746                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 747
 748                         __net_timestamp(skb);
 749
 750                         nfc_llcp_send_to_raw_sock(local, skb,
 751                                                   NFC_DIRECTION_TX);
 752
 753                         ret = nfc_data_exchange(local->dev, local->target_idx,
 754                                                 skb, nfc_llcp_recv, local);
 755
 756                         if (ret) {
 757                                 kfree_skb(copy_skb);
 758                                 goto out;
 759                         }
 760
 761                         if (ptype == LLCP_PDU_I && copy_skb)
 762                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 763                                                copy_skb);
 764                 }
 765         } else {
 766                 nfc_llcp_send_symm(local->dev);
 767         }
 768
 769 out:
 770         mod_timer(&local->link_timer,
 771                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 772 }
 773
 774 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 775                                                           u8 ssap)
 776 {
 777         struct sock *sk;
 778         struct nfc_llcp_sock *llcp_sock;
 779
 780         read_lock(&local->connecting_sockets.lock);
 781
 782         sk_for_each(sk, &local->connecting_sockets.head) {
 783                 llcp_sock = nfc_llcp_sock(sk);
 784
 785                 if (llcp_sock->ssap == ssap) {
 786                         sock_hold(&llcp_sock->sk);
 787                         goto out;
 788                 }
 789         }
 790
 791         llcp_sock = NULL;
 792
 793 out:
 794         read_unlock(&local->connecting_sockets.lock);
 795
 796         return llcp_sock;
 797 }
 798
 799 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 800                                                   u8 *sn, size_t sn_len)
 801 {
 802         struct nfc_llcp_sock *llcp_sock;
 803
 804         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 805
 806         if (llcp_sock == NULL)
 807                 return NULL;
 808
 809         sock_hold(&llcp_sock->sk);
 810
 811         return llcp_sock;
 812 }
 813
 814 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
 815 {
 816         u8 *tlv = &skb->data[2], type, length;
 817         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 818
 819         while (offset < tlv_array_len) {
 820                 type = tlv[0];
 821                 length = tlv[1];
 822
 823                 pr_debug("type 0x%x length %d\n", type, length);
 824
 825                 if (type == LLCP_TLV_SN) {
 826                         *sn_len = length;
 827                         return &tlv[2];
 828                 }
 829
 830                 offset += length + 2;
 831                 tlv += length + 2;
 832         }
 833
 834         return NULL;
 835 }
 836
 837 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 838                              struct sk_buff *skb)
 839 {
 840         struct nfc_llcp_sock *llcp_sock;
 841         struct nfc_llcp_ui_cb *ui_cb;
 842         u8 dsap, ssap;
 843
 844         dsap = nfc_llcp_dsap(skb);
 845         ssap = nfc_llcp_ssap(skb);
 846
 847         ui_cb = nfc_llcp_ui_skb_cb(skb);
 848         ui_cb->dsap = dsap;
 849         ui_cb->ssap = ssap;
 850
 851         pr_debug("%d %d\n", dsap, ssap);
 852
 853         /* We're looking for a bound socket, not a client one */
 854         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 855         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 856                 return;
 857
 858         /* There is no sequence with UI frames */
 859         skb_pull(skb, LLCP_HEADER_SIZE);
 860         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 861                 /*
 862                  * UI frames will be freed from the socket layer, so we
 863                  * need to keep them alive until someone receives them.
 864                  */
 865                 skb_get(skb);
 866         } else {
 867                 pr_err("Receive queue is full\n");
 868         }
 869
 870         nfc_llcp_sock_put(llcp_sock);
 871 }
 872
 873 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 874                                   struct sk_buff *skb)
 875 {
 876         struct sock *new_sk, *parent;
 877         struct nfc_llcp_sock *sock, *new_sock;
 878         u8 dsap, ssap, reason;
 879
 880         dsap = nfc_llcp_dsap(skb);
 881         ssap = nfc_llcp_ssap(skb);
 882
 883         pr_debug("%d %d\n", dsap, ssap);
 884
 885         if (dsap != LLCP_SAP_SDP) {
 886                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 887                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 888                         reason = LLCP_DM_NOBOUND;
 889                         goto fail;
 890                 }
 891         } else {
 892                 u8 *sn;
 893                 size_t sn_len;
 894
 895                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 896                 if (sn == NULL) {
 897                         reason = LLCP_DM_NOBOUND;
 898                         goto fail;
 899                 }
 900
 901                 pr_debug("Service name length %zu\n", sn_len);
 902
 903                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 904                 if (sock == NULL) {
 905                         reason = LLCP_DM_NOBOUND;
 906                         goto fail;
 907                 }
 908         }
 909
 910         lock_sock(&sock->sk);
 911
 912         parent = &sock->sk;
 913
 914         if (sk_acceptq_is_full(parent)) {
 915                 reason = LLCP_DM_REJ;
 916                 release_sock(&sock->sk);
 917                 sock_put(&sock->sk);
 918                 goto fail;
 919         }
 920
 921         if (sock->ssap == LLCP_SDP_UNBOUND) {
 922                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 923
 924                 pr_debug("First client, reserving %d\n", ssap);
 925
 926                 if (ssap == LLCP_SAP_MAX) {
 927                         reason = LLCP_DM_REJ;
 928                         release_sock(&sock->sk);
 929                         sock_put(&sock->sk);
 930                         goto fail;
 931                 }
 932
 933                 sock->ssap = ssap;
 934         }
 935
 936         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
 937         if (new_sk == NULL) {
 938                 reason = LLCP_DM_REJ;
 939                 release_sock(&sock->sk);
 940                 sock_put(&sock->sk);
 941                 goto fail;
 942         }
 943
 944         new_sock = nfc_llcp_sock(new_sk);
 945         new_sock->dev = local->dev;
 946         new_sock->local = nfc_llcp_local_get(local);
 947         new_sock->rw = sock->rw;
 948         new_sock->miux = sock->miux;
 949         new_sock->nfc_protocol = sock->nfc_protocol;
 950         new_sock->dsap = ssap;
 951         new_sock->target_idx = local->target_idx;
 952         new_sock->parent = parent;
 953         new_sock->ssap = sock->ssap;
 954         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 955                 atomic_t *client_count;
 956
 957                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 958
 959                 client_count =
 960                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 961
 962                 atomic_inc(client_count);
 963                 new_sock->reserved_ssap = sock->ssap;
 964         }
 965
 966         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 967                                       skb->len - LLCP_HEADER_SIZE);
 968
 969         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 970
 971         nfc_llcp_sock_link(&local->sockets, new_sk);
 972
 973         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
 974
 975         nfc_get_device(local->dev->idx);
 976
 977         new_sk->sk_state = LLCP_CONNECTED;
 978
 979         /* Wake the listening processes */
 980         parent->sk_data_ready(parent);
 981
 982         /* Send CC */
 983         nfc_llcp_send_cc(new_sock);
 984
 985         release_sock(&sock->sk);
 986         sock_put(&sock->sk);
 987
 988         return;
 989
 990 fail:
 991         /* Send DM */
 992         nfc_llcp_send_dm(local, dsap, ssap, reason);
 993 }
 994
 995 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
 996 {
 997         int nr_frames = 0;
 998         struct nfc_llcp_local *local = sock->local;
 999
1000         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1001                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1002                  sock->remote_rw);
1003
1004         /* Try to queue some I frames for transmission */
1005         while (sock->remote_ready &&
1006                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1007                 struct sk_buff *pdu;
1008
1009                 pdu = skb_dequeue(&sock->tx_queue);
1010                 if (pdu == NULL)
1011                         break;
1012
1013                 /* Update N(S)/N(R) */
1014                 nfc_llcp_set_nrns(sock, pdu);
1015
1016                 skb_queue_tail(&local->tx_queue, pdu);
1017                 nr_frames++;
1018         }
1019
1020         return nr_frames;
1021 }
1022
1023 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1024                                struct sk_buff *skb)
1025 {
1026         struct nfc_llcp_sock *llcp_sock;
1027         struct sock *sk;
1028         u8 dsap, ssap, ptype, ns, nr;
1029
1030         ptype = nfc_llcp_ptype(skb);
1031         dsap = nfc_llcp_dsap(skb);
1032         ssap = nfc_llcp_ssap(skb);
1033         ns = nfc_llcp_ns(skb);
1034         nr = nfc_llcp_nr(skb);
1035
1036         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1037
1038         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1039         if (llcp_sock == NULL) {
1040                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1041                 return;
1042         }
1043
1044         sk = &llcp_sock->sk;
1045         lock_sock(sk);
1046         if (sk->sk_state == LLCP_CLOSED) {
1047                 release_sock(sk);
1048                 nfc_llcp_sock_put(llcp_sock);
1049         }
1050
1051         /* Pass the payload upstream */
1052         if (ptype == LLCP_PDU_I) {
1053                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1054
1055                 if (ns == llcp_sock->recv_n)
1056                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1057                 else
1058                         pr_err("Received out of sequence I PDU\n");
1059
1060                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1061                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1062                         /*
1063                          * I frames will be freed from the socket layer, so we
1064                          * need to keep them alive until someone receives them.
1065                          */
1066                         skb_get(skb);
1067                 } else {
1068                         pr_err("Receive queue is full\n");
1069                 }
1070         }
1071
1072         /* Remove skbs from the pending queue */
1073         if (llcp_sock->send_ack_n != nr) {
1074                 struct sk_buff *s, *tmp;
1075                 u8 n;
1076
1077                 llcp_sock->send_ack_n = nr;
1078
1079                 /* Remove and free all skbs until ns == nr */
1080                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1081                         n = nfc_llcp_ns(s);
1082
1083                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1084                         kfree_skb(s);
1085
1086                         if (n == nr)
1087                                 break;
1088                 }
1089
1090                 /* Re-queue the remaining skbs for transmission */
1091                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1092                                             s, tmp) {
1093                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1094                         skb_queue_head(&local->tx_queue, s);
1095                 }
1096         }
1097
1098         if (ptype == LLCP_PDU_RR)
1099                 llcp_sock->remote_ready = true;
1100         else if (ptype == LLCP_PDU_RNR)
1101                 llcp_sock->remote_ready = false;
1102
1103         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1104                 nfc_llcp_send_rr(llcp_sock);
1105
1106         release_sock(sk);
1107         nfc_llcp_sock_put(llcp_sock);
1108 }
1109
1110 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1111                                struct sk_buff *skb)
1112 {
1113         struct nfc_llcp_sock *llcp_sock;
1114         struct sock *sk;
1115         u8 dsap, ssap;
1116
1117         dsap = nfc_llcp_dsap(skb);
1118         ssap = nfc_llcp_ssap(skb);
1119
1120         if ((dsap == 0) && (ssap == 0)) {
1121                 pr_debug("Connection termination");
1122                 nfc_dep_link_down(local->dev);
1123                 return;
1124         }
1125
1126         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1127         if (llcp_sock == NULL) {
1128                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1129                 return;
1130         }
1131
1132         sk = &llcp_sock->sk;
1133         lock_sock(sk);
1134
1135         nfc_llcp_socket_purge(llcp_sock);
1136
1137         if (sk->sk_state == LLCP_CLOSED) {
1138                 release_sock(sk);
1139                 nfc_llcp_sock_put(llcp_sock);
1140         }
1141
1142         if (sk->sk_state == LLCP_CONNECTED) {
1143                 nfc_put_device(local->dev);
1144                 sk->sk_state = LLCP_CLOSED;
1145                 sk->sk_state_change(sk);
1146         }
1147
1148         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1149
1150         release_sock(sk);
1151         nfc_llcp_sock_put(llcp_sock);
1152 }
1153
1154 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1155 {
1156         struct nfc_llcp_sock *llcp_sock;
1157         struct sock *sk;
1158         u8 dsap, ssap;
1159
1160         dsap = nfc_llcp_dsap(skb);
1161         ssap = nfc_llcp_ssap(skb);
1162
1163         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1164         if (llcp_sock == NULL) {
1165                 pr_err("Invalid CC\n");
1166                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1167
1168                 return;
1169         }
1170
1171         sk = &llcp_sock->sk;
1172
1173         /* Unlink from connecting and link to the client array */
1174         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1175         nfc_llcp_sock_link(&local->sockets, sk);
1176         llcp_sock->dsap = ssap;
1177
1178         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1179                                       skb->len - LLCP_HEADER_SIZE);
1180
1181         sk->sk_state = LLCP_CONNECTED;
1182         sk->sk_state_change(sk);
1183
1184         nfc_llcp_sock_put(llcp_sock);
1185 }
1186
1187 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1188 {
1189         struct nfc_llcp_sock *llcp_sock;
1190         struct sock *sk;
1191         u8 dsap, ssap, reason;
1192
1193         dsap = nfc_llcp_dsap(skb);
1194         ssap = nfc_llcp_ssap(skb);
1195         reason = skb->data[2];
1196
1197         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1198
1199         switch (reason) {
1200         case LLCP_DM_NOBOUND:
1201         case LLCP_DM_REJ:
1202                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1203                 break;
1204
1205         default:
1206                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1207                 break;
1208         }
1209
1210         if (llcp_sock == NULL) {
1211                 pr_debug("Already closed\n");
1212                 return;
1213         }
1214
1215         sk = &llcp_sock->sk;
1216
1217         sk->sk_err = ENXIO;
1218         sk->sk_state = LLCP_CLOSED;
1219         sk->sk_state_change(sk);
1220
1221         nfc_llcp_sock_put(llcp_sock);
1222 }
1223
1224 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1225                               struct sk_buff *skb)
1226 {
1227         struct nfc_llcp_sock *llcp_sock;
1228         u8 dsap, ssap, *tlv, type, length, tid, sap;
1229         u16 tlv_len, offset;
1230         char *service_name;
1231         size_t service_name_len;
1232         struct nfc_llcp_sdp_tlv *sdp;
1233         HLIST_HEAD(llc_sdres_list);
1234         size_t sdres_tlvs_len;
1235         HLIST_HEAD(nl_sdres_list);
1236
1237         dsap = nfc_llcp_dsap(skb);
1238         ssap = nfc_llcp_ssap(skb);
1239
1240         pr_debug("%d %d\n", dsap, ssap);
1241
1242         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1243                 pr_err("Wrong SNL SAP\n");
1244                 return;
1245         }
1246
1247         tlv = &skb->data[LLCP_HEADER_SIZE];
1248         tlv_len = skb->len - LLCP_HEADER_SIZE;
1249         offset = 0;
1250         sdres_tlvs_len = 0;
1251
1252         while (offset < tlv_len) {
1253                 type = tlv[0];
1254                 length = tlv[1];
1255
1256                 switch (type) {
1257                 case LLCP_TLV_SDREQ:
1258                         tid = tlv[2];
1259                         service_name = (char *) &tlv[3];
1260                         service_name_len = length - 1;
1261
1262                         pr_debug("Looking for %.16s\n", service_name);
1263
1264                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1265                             !strncmp(service_name, "urn:nfc:sn:sdp",
1266                                      service_name_len)) {
1267                                 sap = 1;
1268                                 goto add_snl;
1269                         }
1270
1271                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1272                                                           service_name_len);
1273                         if (!llcp_sock) {
1274                                 sap = 0;
1275                                 goto add_snl;
1276                         }
1277
1278                         /*
1279                          * We found a socket but its ssap has not been reserved
1280                          * yet. We need to assign it for good and send a reply.
1281                          * The ssap will be freed when the socket is closed.
1282                          */
1283                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1284                                 atomic_t *client_count;
1285
1286                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1287
1288                                 pr_debug("Reserving %d\n", sap);
1289
1290                                 if (sap == LLCP_SAP_MAX) {
1291                                         sap = 0;
1292                                         goto add_snl;
1293                                 }
1294
1295                                 client_count =
1296                                         &local->local_sdp_cnt[sap -
1297                                                               LLCP_WKS_NUM_SAP];
1298
1299                                 atomic_inc(client_count);
1300
1301                                 llcp_sock->ssap = sap;
1302                                 llcp_sock->reserved_ssap = sap;
1303                         } else {
1304                                 sap = llcp_sock->ssap;
1305                         }
1306
1307                         pr_debug("%p %d\n", llcp_sock, sap);
1308
1309 add_snl:
1310                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1311                         if (sdp == NULL)
1312                                 goto exit;
1313
1314                         sdres_tlvs_len += sdp->tlv_len;
1315                         hlist_add_head(&sdp->node, &llc_sdres_list);
1316                         break;
1317
1318                 case LLCP_TLV_SDRES:
1319                         mutex_lock(&local->sdreq_lock);
1320
1321                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1322
1323                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1324                                 if (sdp->tid != tlv[2])
1325                                         continue;
1326
1327                                 sdp->sap = tlv[3];
1328
1329                                 pr_debug("Found: uri=%s, sap=%d\n",
1330                                          sdp->uri, sdp->sap);
1331
1332                                 hlist_del(&sdp->node);
1333
1334                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1335
1336                                 break;
1337                         }
1338
1339                         mutex_unlock(&local->sdreq_lock);
1340                         break;
1341
1342                 default:
1343                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1344                         break;
1345                 }
1346
1347                 offset += length + 2;
1348                 tlv += length + 2;
1349         }
1350
1351 exit:
1352         if (!hlist_empty(&nl_sdres_list))
1353                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1354
1355         if (!hlist_empty(&llc_sdres_list))
1356                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1357 }
1358
1359 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1360 {
1361         u8 ptype;
1362         u16 pdu_len;
1363         struct sk_buff *new_skb;
1364
1365         if (skb->len <= LLCP_HEADER_SIZE) {
1366                 pr_err("Malformed AGF PDU\n");
1367                 return;
1368         }
1369
1370         skb_pull(skb, LLCP_HEADER_SIZE);
1371
1372         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1373                 pdu_len = skb->data[0] << 8 | skb->data[1];
1374
1375                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1376
1377                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1378                         pr_err("Malformed AGF PDU\n");
1379                         return;
1380                 }
1381
1382                 ptype = nfc_llcp_ptype(skb);
1383
1384                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1385                         goto next;
1386
1387                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1388                 if (new_skb == NULL) {
1389                         pr_err("Could not allocate PDU\n");
1390                         return;
1391                 }
1392
1393                 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1394
1395                 nfc_llcp_rx_skb(local, new_skb);
1396
1397                 kfree_skb(new_skb);
1398 next:
1399                 skb_pull(skb, pdu_len);
1400         }
1401 }
1402
1403 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1404 {
1405         u8 dsap, ssap, ptype;
1406
1407         ptype = nfc_llcp_ptype(skb);
1408         dsap = nfc_llcp_dsap(skb);
1409         ssap = nfc_llcp_ssap(skb);
1410
1411         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1412
1413         if (ptype != LLCP_PDU_SYMM)
1414                 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1415                                      skb->data, skb->len, true);
1416
1417         switch (ptype) {
1418         case LLCP_PDU_SYMM:
1419                 pr_debug("SYMM\n");
1420                 break;
1421
1422         case LLCP_PDU_UI:
1423                 pr_debug("UI\n");
1424                 nfc_llcp_recv_ui(local, skb);
1425                 break;
1426
1427         case LLCP_PDU_CONNECT:
1428                 pr_debug("CONNECT\n");
1429                 nfc_llcp_recv_connect(local, skb);
1430                 break;
1431
1432         case LLCP_PDU_DISC:
1433                 pr_debug("DISC\n");
1434                 nfc_llcp_recv_disc(local, skb);
1435                 break;
1436
1437         case LLCP_PDU_CC:
1438                 pr_debug("CC\n");
1439                 nfc_llcp_recv_cc(local, skb);
1440                 break;
1441
1442         case LLCP_PDU_DM:
1443                 pr_debug("DM\n");
1444                 nfc_llcp_recv_dm(local, skb);
1445                 break;
1446
1447         case LLCP_PDU_SNL:
1448                 pr_debug("SNL\n");
1449                 nfc_llcp_recv_snl(local, skb);
1450                 break;
1451
1452         case LLCP_PDU_I:
1453         case LLCP_PDU_RR:
1454         case LLCP_PDU_RNR:
1455                 pr_debug("I frame\n");
1456                 nfc_llcp_recv_hdlc(local, skb);
1457                 break;
1458
1459         case LLCP_PDU_AGF:
1460                 pr_debug("AGF frame\n");
1461                 nfc_llcp_recv_agf(local, skb);
1462                 break;
1463         }
1464 }
1465
1466 static void nfc_llcp_rx_work(struct work_struct *work)
1467 {
1468         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1469                                                     rx_work);
1470         struct sk_buff *skb;
1471
1472         skb = local->rx_pending;
1473         if (skb == NULL) {
1474                 pr_debug("No pending SKB\n");
1475                 return;
1476         }
1477
1478         __net_timestamp(skb);
1479
1480         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1481
1482         nfc_llcp_rx_skb(local, skb);
1483
1484         schedule_work(&local->tx_work);
1485         kfree_skb(local->rx_pending);
1486         local->rx_pending = NULL;
1487 }
1488
1489 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1490 {
1491         local->rx_pending = skb;
1492         del_timer(&local->link_timer);
1493         schedule_work(&local->rx_work);
1494 }
1495
1496 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1497 {
1498         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1499
1500         pr_debug("Received an LLCP PDU\n");
1501         if (err < 0) {
1502                 pr_err("err %d\n", err);
1503                 return;
1504         }
1505
1506         __nfc_llcp_recv(local, skb);
1507 }
1508
1509 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1510 {
1511         struct nfc_llcp_local *local;
1512
1513         local = nfc_llcp_find_local(dev);
1514         if (local == NULL) {
1515                 kfree_skb(skb);
1516                 return -ENODEV;
1517         }
1518
1519         __nfc_llcp_recv(local, skb);
1520
1521         return 0;
1522 }
1523
1524 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1525 {
1526         struct nfc_llcp_local *local;
1527
1528         local = nfc_llcp_find_local(dev);
1529         if (local == NULL)
1530                 return;
1531
1532         local->remote_miu = LLCP_DEFAULT_MIU;
1533         local->remote_lto = LLCP_DEFAULT_LTO;
1534
1535         /* Close and purge all existing sockets */
1536         nfc_llcp_socket_release(local, true, 0);
1537 }
1538
1539 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1540                         u8 comm_mode, u8 rf_mode)
1541 {
1542         struct nfc_llcp_local *local;
1543
1544         pr_debug("rf mode %d\n", rf_mode);
1545
1546         local = nfc_llcp_find_local(dev);
1547         if (local == NULL)
1548                 return;
1549
1550         local->target_idx = target_idx;
1551         local->comm_mode = comm_mode;
1552         local->rf_mode = rf_mode;
1553
1554         if (rf_mode == NFC_RF_INITIATOR) {
1555                 pr_debug("Queueing Tx work\n");
1556
1557                 schedule_work(&local->tx_work);
1558         } else {
1559                 mod_timer(&local->link_timer,
1560                           jiffies + msecs_to_jiffies(local->remote_lto));
1561         }
1562 }
1563
1564 int nfc_llcp_register_device(struct nfc_dev *ndev)
1565 {
1566         struct nfc_llcp_local *local;
1567
1568         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1569         if (local == NULL)
1570                 return -ENOMEM;
1571
1572         local->dev = ndev;
1573         INIT_LIST_HEAD(&local->list);
1574         kref_init(&local->ref);
1575         mutex_init(&local->sdp_lock);
1576         init_timer(&local->link_timer);
1577         local->link_timer.data = (unsigned long) local;
1578         local->link_timer.function = nfc_llcp_symm_timer;
1579
1580         skb_queue_head_init(&local->tx_queue);
1581         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1582
1583         local->rx_pending = NULL;
1584         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1585
1586         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1587
1588         rwlock_init(&local->sockets.lock);
1589         rwlock_init(&local->connecting_sockets.lock);
1590         rwlock_init(&local->raw_sockets.lock);
1591
1592         local->lto = 150; /* 1500 ms */
1593         local->rw = LLCP_MAX_RW;
1594         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1595         local->local_wks = 0x1; /* LLC Link Management */
1596
1597         nfc_llcp_build_gb(local);
1598
1599         local->remote_miu = LLCP_DEFAULT_MIU;
1600         local->remote_lto = LLCP_DEFAULT_LTO;
1601
1602         mutex_init(&local->sdreq_lock);
1603         INIT_HLIST_HEAD(&local->pending_sdreqs);
1604         init_timer(&local->sdreq_timer);
1605         local->sdreq_timer.data = (unsigned long) local;
1606         local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1607         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1608
1609         list_add(&local->list, &llcp_devices);
1610
1611         return 0;
1612 }
1613
1614 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1615 {
1616         struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1617
1618         if (local == NULL) {
1619                 pr_debug("No such device\n");
1620                 return;
1621         }
1622
1623         local_cleanup(local);
1624
1625         nfc_llcp_local_put(local);
1626 }
1627
1628 int __init nfc_llcp_init(void)
1629 {
1630         return nfc_llcp_sock_init();
1631 }
1632
1633 void nfc_llcp_exit(void)
1634 {
1635         nfc_llcp_sock_exit();
1636 }