Pileus Git - ~andy/linux/blob - net/nfc/llcp_core.c

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