net/nfc/llcp_core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2011  Intel Corporation. All rights reserved.
   4  * Copyright (C) 2014 Marvell International Ltd.
   5  */
   6
   7 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
   8
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/list.h>
  12 #include <linux/nfc.h>
  13
  14 #include "nfc.h"
  15 #include "llcp.h"
  16
  17 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
  18
  19 static LIST_HEAD(llcp_devices);
  20 /* Protects llcp_devices list */
  21 static DEFINE_SPINLOCK(llcp_devices_lock);
  22
  23 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
  24
  25 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
  26 {
  27         write_lock(&l->lock);
  28         sk_add_node(sk, &l->head);
  29         write_unlock(&l->lock);
  30 }
  31
  32 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
  33 {
  34         write_lock(&l->lock);
  35         sk_del_node_init(sk);
  36         write_unlock(&l->lock);
  37 }
  38
  39 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
  40 {
  41         sock->remote_rw = LLCP_DEFAULT_RW;
  42         sock->remote_miu = LLCP_MAX_MIU + 1;
  43 }
  44
  45 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
  46 {
  47         struct nfc_llcp_local *local = sock->local;
  48         struct sk_buff *s, *tmp;
  49
  50         skb_queue_purge(&sock->tx_queue);
  51         skb_queue_purge(&sock->tx_pending_queue);
  52
  53         if (local == NULL)
  54                 return;
  55
  56         /* Search for local pending SKBs that are related to this socket */
  57         skb_queue_walk_safe(&local->tx_queue, s, tmp) {
  58                 if (s->sk != &sock->sk)
  59                         continue;
  60
  61                 skb_unlink(s, &local->tx_queue);
  62                 kfree_skb(s);
  63         }
  64 }
  65
  66 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
  67                                     int err)
  68 {
  69         struct sock *sk;
  70         struct hlist_node *tmp;
  71         struct nfc_llcp_sock *llcp_sock;
  72
  73         skb_queue_purge(&local->tx_queue);
  74
  75         write_lock(&local->sockets.lock);
  76
  77         sk_for_each_safe(sk, tmp, &local->sockets.head) {
  78                 llcp_sock = nfc_llcp_sock(sk);
  79
  80                 bh_lock_sock(sk);
  81
  82                 nfc_llcp_socket_purge(llcp_sock);
  83
  84                 if (sk->sk_state == LLCP_CONNECTED)
  85                         nfc_put_device(llcp_sock->dev);
  86
  87                 if (sk->sk_state == LLCP_LISTEN) {
  88                         struct nfc_llcp_sock *lsk, *n;
  89                         struct sock *accept_sk;
  90
  91                         list_for_each_entry_safe(lsk, n,
  92                                                  &llcp_sock->accept_queue,
  93                                                  accept_queue) {
  94                                 accept_sk = &lsk->sk;
  95                                 bh_lock_sock(accept_sk);
  96
  97                                 nfc_llcp_accept_unlink(accept_sk);
  98
  99                                 if (err)
 100                                         accept_sk->sk_err = err;
 101                                 accept_sk->sk_state = LLCP_CLOSED;
 102                                 accept_sk->sk_state_change(sk);
 103
 104                                 bh_unlock_sock(accept_sk);
 105                         }
 106                 }
 107
 108                 if (err)
 109                         sk->sk_err = err;
 110                 sk->sk_state = LLCP_CLOSED;
 111                 sk->sk_state_change(sk);
 112
 113                 bh_unlock_sock(sk);
 114
 115                 sk_del_node_init(sk);
 116         }
 117
 118         write_unlock(&local->sockets.lock);
 119
 120         /* If we still have a device, we keep the RAW sockets alive */
 121         if (device == true)
 122                 return;
 123
 124         write_lock(&local->raw_sockets.lock);
 125
 126         sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
 127                 llcp_sock = nfc_llcp_sock(sk);
 128
 129                 bh_lock_sock(sk);
 130
 131                 nfc_llcp_socket_purge(llcp_sock);
 132
 133                 if (err)
 134                         sk->sk_err = err;
 135                 sk->sk_state = LLCP_CLOSED;
 136                 sk->sk_state_change(sk);
 137
 138                 bh_unlock_sock(sk);
 139
 140                 sk_del_node_init(sk);
 141         }
 142
 143         write_unlock(&local->raw_sockets.lock);
 144 }
 145
 146 static struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
 147 {
 148         kref_get(&local->ref);
 149
 150         return local;
 151 }
 152
 153 static void local_cleanup(struct nfc_llcp_local *local)
 154 {
 155         nfc_llcp_socket_release(local, false, ENXIO);
 156         del_timer_sync(&local->link_timer);
 157         skb_queue_purge(&local->tx_queue);
 158         cancel_work_sync(&local->tx_work);
 159         cancel_work_sync(&local->rx_work);
 160         cancel_work_sync(&local->timeout_work);
 161         kfree_skb(local->rx_pending);
 162         local->rx_pending = NULL;
 163         del_timer_sync(&local->sdreq_timer);
 164         cancel_work_sync(&local->sdreq_timeout_work);
 165         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
 166 }
 167
 168 static void local_release(struct kref *ref)
 169 {
 170         struct nfc_llcp_local *local;
 171
 172         local = container_of(ref, struct nfc_llcp_local, ref);
 173
 174         local_cleanup(local);
 175         kfree(local);
 176 }
 177
 178 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 179 {
 180         if (local == NULL)
 181                 return 0;
 182
 183         return kref_put(&local->ref, local_release);
 184 }
 185
 186 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 187                                                u8 ssap, u8 dsap)
 188 {
 189         struct sock *sk;
 190         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 191
 192         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 193
 194         if (ssap == 0 && dsap == 0)
 195                 return NULL;
 196
 197         read_lock(&local->sockets.lock);
 198
 199         llcp_sock = NULL;
 200
 201         sk_for_each(sk, &local->sockets.head) {
 202                 tmp_sock = nfc_llcp_sock(sk);
 203
 204                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 205                         llcp_sock = tmp_sock;
 206                         break;
 207                 }
 208         }
 209
 210         read_unlock(&local->sockets.lock);
 211
 212         if (llcp_sock == NULL)
 213                 return NULL;
 214
 215         sock_hold(&llcp_sock->sk);
 216
 217         return llcp_sock;
 218 }
 219
 220 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 221 {
 222         sock_put(&sock->sk);
 223 }
 224
 225 static void nfc_llcp_timeout_work(struct work_struct *work)
 226 {
 227         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 228                                                     timeout_work);
 229
 230         nfc_dep_link_down(local->dev);
 231 }
 232
 233 static void nfc_llcp_symm_timer(struct timer_list *t)
 234 {
 235         struct nfc_llcp_local *local = from_timer(local, t, link_timer);
 236
 237         pr_err("SYMM timeout\n");
 238
 239         schedule_work(&local->timeout_work);
 240 }
 241
 242 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
 243 {
 244         unsigned long time;
 245         HLIST_HEAD(nl_sdres_list);
 246         struct hlist_node *n;
 247         struct nfc_llcp_sdp_tlv *sdp;
 248         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 249                                                     sdreq_timeout_work);
 250
 251         mutex_lock(&local->sdreq_lock);
 252
 253         time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
 254
 255         hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
 256                 if (time_after(sdp->time, time))
 257                         continue;
 258
 259                 sdp->sap = LLCP_SDP_UNBOUND;
 260
 261                 hlist_del(&sdp->node);
 262
 263                 hlist_add_head(&sdp->node, &nl_sdres_list);
 264         }
 265
 266         if (!hlist_empty(&local->pending_sdreqs))
 267                 mod_timer(&local->sdreq_timer,
 268                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
 269
 270         mutex_unlock(&local->sdreq_lock);
 271
 272         if (!hlist_empty(&nl_sdres_list))
 273                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
 274 }
 275
 276 static void nfc_llcp_sdreq_timer(struct timer_list *t)
 277 {
 278         struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
 279
 280         schedule_work(&local->sdreq_timeout_work);
 281 }
 282
 283 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 284 {
 285         struct nfc_llcp_local *local;
 286         struct nfc_llcp_local *res = NULL;
 287
 288         spin_lock(&llcp_devices_lock);
 289         list_for_each_entry(local, &llcp_devices, list)
 290                 if (local->dev == dev) {
 291                         res = nfc_llcp_local_get(local);
 292                         break;
 293                 }
 294         spin_unlock(&llcp_devices_lock);
 295
 296         return res;
 297 }
 298
 299 static struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev)
 300 {
 301         struct nfc_llcp_local *local, *tmp;
 302
 303         spin_lock(&llcp_devices_lock);
 304         list_for_each_entry_safe(local, tmp, &llcp_devices, list)
 305                 if (local->dev == dev) {
 306                         list_del(&local->list);
 307                         spin_unlock(&llcp_devices_lock);
 308                         return local;
 309                 }
 310         spin_unlock(&llcp_devices_lock);
 311
 312         pr_warn("Shutting down device not found\n");
 313
 314         return NULL;
 315 }
 316
 317 static char *wks[] = {
 318         NULL,
 319         NULL, /* SDP */
 320         "urn:nfc:sn:ip",
 321         "urn:nfc:sn:obex",
 322         "urn:nfc:sn:snep",
 323 };
 324
 325 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
 326 {
 327         int sap, num_wks;
 328
 329         pr_debug("%s\n", service_name);
 330
 331         if (service_name == NULL)
 332                 return -EINVAL;
 333
 334         num_wks = ARRAY_SIZE(wks);
 335
 336         for (sap = 0; sap < num_wks; sap++) {
 337                 if (wks[sap] == NULL)
 338                         continue;
 339
 340                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 341                         return sap;
 342         }
 343
 344         return -EINVAL;
 345 }
 346
 347 static
 348 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 349                                             const u8 *sn, size_t sn_len)
 350 {
 351         struct sock *sk;
 352         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 353
 354         pr_debug("sn %zd %p\n", sn_len, sn);
 355
 356         if (sn == NULL || sn_len == 0)
 357                 return NULL;
 358
 359         read_lock(&local->sockets.lock);
 360
 361         llcp_sock = NULL;
 362
 363         sk_for_each(sk, &local->sockets.head) {
 364                 tmp_sock = nfc_llcp_sock(sk);
 365
 366                 pr_debug("llcp sock %p\n", tmp_sock);
 367
 368                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 369                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 370                         continue;
 371
 372                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 373                     tmp_sock->sk.sk_state != LLCP_BOUND)
 374                         continue;
 375
 376                 if (tmp_sock->service_name == NULL ||
 377                     tmp_sock->service_name_len == 0)
 378                         continue;
 379
 380                 if (tmp_sock->service_name_len != sn_len)
 381                         continue;
 382
 383                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 384                         llcp_sock = tmp_sock;
 385                         break;
 386                 }
 387         }
 388
 389         read_unlock(&local->sockets.lock);
 390
 391         pr_debug("Found llcp sock %p\n", llcp_sock);
 392
 393         return llcp_sock;
 394 }
 395
 396 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 397                          struct nfc_llcp_sock *sock)
 398 {
 399         mutex_lock(&local->sdp_lock);
 400
 401         if (sock->service_name != NULL && sock->service_name_len > 0) {
 402                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 403                                             sock->service_name_len);
 404
 405                 if (ssap > 0) {
 406                         pr_debug("WKS %d\n", ssap);
 407
 408                         /* This is a WKS, let's check if it's free */
 409                         if (test_bit(ssap, &local->local_wks)) {
 410                                 mutex_unlock(&local->sdp_lock);
 411
 412                                 return LLCP_SAP_MAX;
 413                         }
 414
 415                         set_bit(ssap, &local->local_wks);
 416                         mutex_unlock(&local->sdp_lock);
 417
 418                         return ssap;
 419                 }
 420
 421                 /*
 422                  * Check if there already is a non WKS socket bound
 423                  * to this service name.
 424                  */
 425                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 426                                           sock->service_name_len) != NULL) {
 427                         mutex_unlock(&local->sdp_lock);
 428
 429                         return LLCP_SAP_MAX;
 430                 }
 431
 432                 mutex_unlock(&local->sdp_lock);
 433
 434                 return LLCP_SDP_UNBOUND;
 435
 436         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 437                 if (!test_bit(sock->ssap, &local->local_wks)) {
 438                         set_bit(sock->ssap, &local->local_wks);
 439                         mutex_unlock(&local->sdp_lock);
 440
 441                         return sock->ssap;
 442                 }
 443         }
 444
 445         mutex_unlock(&local->sdp_lock);
 446
 447         return LLCP_SAP_MAX;
 448 }
 449
 450 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 451 {
 452         u8 local_ssap;
 453
 454         mutex_lock(&local->sdp_lock);
 455
 456         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 457         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 458                 mutex_unlock(&local->sdp_lock);
 459                 return LLCP_SAP_MAX;
 460         }
 461
 462         set_bit(local_ssap, &local->local_sap);
 463
 464         mutex_unlock(&local->sdp_lock);
 465
 466         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 467 }
 468
 469 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 470 {
 471         u8 local_ssap;
 472         unsigned long *sdp;
 473
 474         if (ssap < LLCP_WKS_NUM_SAP) {
 475                 local_ssap = ssap;
 476                 sdp = &local->local_wks;
 477         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 478                 atomic_t *client_cnt;
 479
 480                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 481                 sdp = &local->local_sdp;
 482                 client_cnt = &local->local_sdp_cnt[local_ssap];
 483
 484                 pr_debug("%d clients\n", atomic_read(client_cnt));
 485
 486                 mutex_lock(&local->sdp_lock);
 487
 488                 if (atomic_dec_and_test(client_cnt)) {
 489                         struct nfc_llcp_sock *l_sock;
 490
 491                         pr_debug("No more clients for SAP %d\n", ssap);
 492
 493                         clear_bit(local_ssap, sdp);
 494
 495                         /* Find the listening sock and set it back to UNBOUND */
 496                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 497                         if (l_sock) {
 498                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 499                                 nfc_llcp_sock_put(l_sock);
 500                         }
 501                 }
 502
 503                 mutex_unlock(&local->sdp_lock);
 504
 505                 return;
 506         } else if (ssap < LLCP_MAX_SAP) {
 507                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 508                 sdp = &local->local_sap;
 509         } else {
 510                 return;
 511         }
 512
 513         mutex_lock(&local->sdp_lock);
 514
 515         clear_bit(local_ssap, sdp);
 516
 517         mutex_unlock(&local->sdp_lock);
 518 }
 519
 520 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 521 {
 522         u8 ssap;
 523
 524         mutex_lock(&local->sdp_lock);
 525
 526         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 527         if (ssap == LLCP_SDP_NUM_SAP) {
 528                 mutex_unlock(&local->sdp_lock);
 529
 530                 return LLCP_SAP_MAX;
 531         }
 532
 533         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 534
 535         set_bit(ssap, &local->local_sdp);
 536
 537         mutex_unlock(&local->sdp_lock);
 538
 539         return LLCP_WKS_NUM_SAP + ssap;
 540 }
 541
 542 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 543 {
 544         u8 *gb_cur, version, version_length;
 545         u8 lto_length, wks_length, miux_length;
 546         const u8 *version_tlv = NULL, *lto_tlv = NULL,
 547            *wks_tlv = NULL, *miux_tlv = NULL;
 548         __be16 wks = cpu_to_be16(local->local_wks);
 549         u8 gb_len = 0;
 550         int ret = 0;
 551
 552         version = LLCP_VERSION_11;
 553         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 554                                          1, &version_length);
 555         if (!version_tlv) {
 556                 ret = -ENOMEM;
 557                 goto out;
 558         }
 559         gb_len += version_length;
 560
 561         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 562         if (!lto_tlv) {
 563                 ret = -ENOMEM;
 564                 goto out;
 565         }
 566         gb_len += lto_length;
 567
 568         pr_debug("Local wks 0x%lx\n", local->local_wks);
 569         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
 570         if (!wks_tlv) {
 571                 ret = -ENOMEM;
 572                 goto out;
 573         }
 574         gb_len += wks_length;
 575
 576         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 577                                       &miux_length);
 578         if (!miux_tlv) {
 579                 ret = -ENOMEM;
 580                 goto out;
 581         }
 582         gb_len += miux_length;
 583
 584         gb_len += ARRAY_SIZE(llcp_magic);
 585
 586         if (gb_len > NFC_MAX_GT_LEN) {
 587                 ret = -EINVAL;
 588                 goto out;
 589         }
 590
 591         gb_cur = local->gb;
 592
 593         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 594         gb_cur += ARRAY_SIZE(llcp_magic);
 595
 596         memcpy(gb_cur, version_tlv, version_length);
 597         gb_cur += version_length;
 598
 599         memcpy(gb_cur, lto_tlv, lto_length);
 600         gb_cur += lto_length;
 601
 602         memcpy(gb_cur, wks_tlv, wks_length);
 603         gb_cur += wks_length;
 604
 605         memcpy(gb_cur, miux_tlv, miux_length);
 606         gb_cur += miux_length;
 607
 608         local->gb_len = gb_len;
 609
 610 out:
 611         kfree(version_tlv);
 612         kfree(lto_tlv);
 613         kfree(wks_tlv);
 614         kfree(miux_tlv);
 615
 616         return ret;
 617 }
 618
 619 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 620 {
 621         struct nfc_llcp_local *local;
 622
 623         local = nfc_llcp_find_local(dev);
 624         if (local == NULL) {
 625                 *general_bytes_len = 0;
 626                 return NULL;
 627         }
 628
 629         nfc_llcp_build_gb(local);
 630
 631         *general_bytes_len = local->gb_len;
 632
 633         nfc_llcp_local_put(local);
 634
 635         return local->gb;
 636 }
 637
 638 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
 639 {
 640         struct nfc_llcp_local *local;
 641         int err;
 642
 643         if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
 644                 return -EINVAL;
 645
 646         local = nfc_llcp_find_local(dev);
 647         if (local == NULL) {
 648                 pr_err("No LLCP device\n");
 649                 return -ENODEV;
 650         }
 651
 652         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 653         memcpy(local->remote_gb, gb, gb_len);
 654         local->remote_gb_len = gb_len;
 655
 656         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 657                 pr_err("MAC does not support LLCP\n");
 658                 err = -EINVAL;
 659                 goto out;
 660         }
 661
 662         err = nfc_llcp_parse_gb_tlv(local,
 663                                      &local->remote_gb[3],
 664                                      local->remote_gb_len - 3);
 665 out:
 666         nfc_llcp_local_put(local);
 667         return err;
 668 }
 669
 670 static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
 671 {
 672         return (pdu->data[0] & 0xfc) >> 2;
 673 }
 674
 675 static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
 676 {
 677         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 678 }
 679
 680 static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
 681 {
 682         return pdu->data[1] & 0x3f;
 683 }
 684
 685 static u8 nfc_llcp_ns(const struct sk_buff *pdu)
 686 {
 687         return pdu->data[2] >> 4;
 688 }
 689
 690 static u8 nfc_llcp_nr(const struct sk_buff *pdu)
 691 {
 692         return pdu->data[2] & 0xf;
 693 }
 694
 695 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 696 {
 697         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 698         sock->send_n = (sock->send_n + 1) % 16;
 699         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 700 }
 701
 702 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 703                                struct sk_buff *skb, u8 direction)
 704 {
 705         struct sk_buff *skb_copy = NULL, *nskb;
 706         struct sock *sk;
 707         u8 *data;
 708
 709         read_lock(&local->raw_sockets.lock);
 710
 711         sk_for_each(sk, &local->raw_sockets.head) {
 712                 if (sk->sk_state != LLCP_BOUND)
 713                         continue;
 714
 715                 if (skb_copy == NULL) {
 716                         skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
 717                                                       GFP_ATOMIC, true);
 718
 719                         if (skb_copy == NULL)
 720                                 continue;
 721
 722                         data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
 723
 724                         data[0] = local->dev ? local->dev->idx : 0xFF;
 725                         data[1] = direction & 0x01;
 726                         data[1] |= (RAW_PAYLOAD_LLCP << 1);
 727                 }
 728
 729                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 730                 if (!nskb)
 731                         continue;
 732
 733                 if (sock_queue_rcv_skb(sk, nskb))
 734                         kfree_skb(nskb);
 735         }
 736
 737         read_unlock(&local->raw_sockets.lock);
 738
 739         kfree_skb(skb_copy);
 740 }
 741
 742 static void nfc_llcp_tx_work(struct work_struct *work)
 743 {
 744         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 745                                                     tx_work);
 746         struct sk_buff *skb;
 747         struct sock *sk;
 748         struct nfc_llcp_sock *llcp_sock;
 749
 750         skb = skb_dequeue(&local->tx_queue);
 751         if (skb != NULL) {
 752                 sk = skb->sk;
 753                 llcp_sock = nfc_llcp_sock(sk);
 754
 755                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 756                         kfree_skb(skb);
 757                         nfc_llcp_send_symm(local->dev);
 758                 } else if (llcp_sock && !llcp_sock->remote_ready) {
 759                         skb_queue_head(&local->tx_queue, skb);
 760                         nfc_llcp_send_symm(local->dev);
 761                 } else {
 762                         struct sk_buff *copy_skb = NULL;
 763                         u8 ptype = nfc_llcp_ptype(skb);
 764                         int ret;
 765
 766                         pr_debug("Sending pending skb\n");
 767                         print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
 768                                              16, 1, skb->data, skb->len, true);
 769
 770                         if (ptype == LLCP_PDU_I)
 771                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 772
 773                         __net_timestamp(skb);
 774
 775                         nfc_llcp_send_to_raw_sock(local, skb,
 776                                                   NFC_DIRECTION_TX);
 777
 778                         ret = nfc_data_exchange(local->dev, local->target_idx,
 779                                                 skb, nfc_llcp_recv, local);
 780
 781                         if (ret) {
 782                                 kfree_skb(copy_skb);
 783                                 goto out;
 784                         }
 785
 786                         if (ptype == LLCP_PDU_I && copy_skb)
 787                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 788                                                copy_skb);
 789                 }
 790         } else {
 791                 nfc_llcp_send_symm(local->dev);
 792         }
 793
 794 out:
 795         mod_timer(&local->link_timer,
 796                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 797 }
 798
 799 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 800                                                           u8 ssap)
 801 {
 802         struct sock *sk;
 803         struct nfc_llcp_sock *llcp_sock;
 804
 805         read_lock(&local->connecting_sockets.lock);
 806
 807         sk_for_each(sk, &local->connecting_sockets.head) {
 808                 llcp_sock = nfc_llcp_sock(sk);
 809
 810                 if (llcp_sock->ssap == ssap) {
 811                         sock_hold(&llcp_sock->sk);
 812                         goto out;
 813                 }
 814         }
 815
 816         llcp_sock = NULL;
 817
 818 out:
 819         read_unlock(&local->connecting_sockets.lock);
 820
 821         return llcp_sock;
 822 }
 823
 824 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 825                                                   const u8 *sn, size_t sn_len)
 826 {
 827         struct nfc_llcp_sock *llcp_sock;
 828
 829         llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
 830
 831         if (llcp_sock == NULL)
 832                 return NULL;
 833
 834         sock_hold(&llcp_sock->sk);
 835
 836         return llcp_sock;
 837 }
 838
 839 static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
 840 {
 841         u8 type, length;
 842         const u8 *tlv = &skb->data[2];
 843         size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
 844
 845         while (offset < tlv_array_len) {
 846                 type = tlv[0];
 847                 length = tlv[1];
 848
 849                 pr_debug("type 0x%x length %d\n", type, length);
 850
 851                 if (type == LLCP_TLV_SN) {
 852                         *sn_len = length;
 853                         return &tlv[2];
 854                 }
 855
 856                 offset += length + 2;
 857                 tlv += length + 2;
 858         }
 859
 860         return NULL;
 861 }
 862
 863 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
 864                              struct sk_buff *skb)
 865 {
 866         struct nfc_llcp_sock *llcp_sock;
 867         struct nfc_llcp_ui_cb *ui_cb;
 868         u8 dsap, ssap;
 869
 870         dsap = nfc_llcp_dsap(skb);
 871         ssap = nfc_llcp_ssap(skb);
 872
 873         ui_cb = nfc_llcp_ui_skb_cb(skb);
 874         ui_cb->dsap = dsap;
 875         ui_cb->ssap = ssap;
 876
 877         pr_debug("%d %d\n", dsap, ssap);
 878
 879         /* We're looking for a bound socket, not a client one */
 880         llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 881         if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
 882                 return;
 883
 884         /* There is no sequence with UI frames */
 885         skb_pull(skb, LLCP_HEADER_SIZE);
 886         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
 887                 /*
 888                  * UI frames will be freed from the socket layer, so we
 889                  * need to keep them alive until someone receives them.
 890                  */
 891                 skb_get(skb);
 892         } else {
 893                 pr_err("Receive queue is full\n");
 894         }
 895
 896         nfc_llcp_sock_put(llcp_sock);
 897 }
 898
 899 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 900                                   const struct sk_buff *skb)
 901 {
 902         struct sock *new_sk, *parent;
 903         struct nfc_llcp_sock *sock, *new_sock;
 904         u8 dsap, ssap, reason;
 905
 906         dsap = nfc_llcp_dsap(skb);
 907         ssap = nfc_llcp_ssap(skb);
 908
 909         pr_debug("%d %d\n", dsap, ssap);
 910
 911         if (dsap != LLCP_SAP_SDP) {
 912                 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
 913                 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
 914                         reason = LLCP_DM_NOBOUND;
 915                         goto fail;
 916                 }
 917         } else {
 918                 const u8 *sn;
 919                 size_t sn_len;
 920
 921                 sn = nfc_llcp_connect_sn(skb, &sn_len);
 922                 if (sn == NULL) {
 923                         reason = LLCP_DM_NOBOUND;
 924                         goto fail;
 925                 }
 926
 927                 pr_debug("Service name length %zu\n", sn_len);
 928
 929                 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
 930                 if (sock == NULL) {
 931                         reason = LLCP_DM_NOBOUND;
 932                         goto fail;
 933                 }
 934         }
 935
 936         lock_sock(&sock->sk);
 937
 938         parent = &sock->sk;
 939
 940         if (sk_acceptq_is_full(parent)) {
 941                 reason = LLCP_DM_REJ;
 942                 release_sock(&sock->sk);
 943                 sock_put(&sock->sk);
 944                 goto fail;
 945         }
 946
 947         if (sock->ssap == LLCP_SDP_UNBOUND) {
 948                 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
 949
 950                 pr_debug("First client, reserving %d\n", ssap);
 951
 952                 if (ssap == LLCP_SAP_MAX) {
 953                         reason = LLCP_DM_REJ;
 954                         release_sock(&sock->sk);
 955                         sock_put(&sock->sk);
 956                         goto fail;
 957                 }
 958
 959                 sock->ssap = ssap;
 960         }
 961
 962         new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
 963         if (new_sk == NULL) {
 964                 reason = LLCP_DM_REJ;
 965                 release_sock(&sock->sk);
 966                 sock_put(&sock->sk);
 967                 goto fail;
 968         }
 969
 970         new_sock = nfc_llcp_sock(new_sk);
 971         new_sock->dev = local->dev;
 972         new_sock->local = nfc_llcp_local_get(local);
 973         new_sock->rw = sock->rw;
 974         new_sock->miux = sock->miux;
 975         new_sock->nfc_protocol = sock->nfc_protocol;
 976         new_sock->dsap = ssap;
 977         new_sock->target_idx = local->target_idx;
 978         new_sock->parent = parent;
 979         new_sock->ssap = sock->ssap;
 980         if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
 981                 atomic_t *client_count;
 982
 983                 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
 984
 985                 client_count =
 986                         &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
 987
 988                 atomic_inc(client_count);
 989                 new_sock->reserved_ssap = sock->ssap;
 990         }
 991
 992         nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
 993                                       skb->len - LLCP_HEADER_SIZE);
 994
 995         pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
 996
 997         nfc_llcp_sock_link(&local->sockets, new_sk);
 998
 999         nfc_llcp_accept_enqueue(&sock->sk, new_sk);
1000
1001         nfc_get_device(local->dev->idx);
1002
1003         new_sk->sk_state = LLCP_CONNECTED;
1004
1005         /* Wake the listening processes */
1006         parent->sk_data_ready(parent);
1007
1008         /* Send CC */
1009         nfc_llcp_send_cc(new_sock);
1010
1011         release_sock(&sock->sk);
1012         sock_put(&sock->sk);
1013
1014         return;
1015
1016 fail:
1017         /* Send DM */
1018         nfc_llcp_send_dm(local, dsap, ssap, reason);
1019 }
1020
1021 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1022 {
1023         int nr_frames = 0;
1024         struct nfc_llcp_local *local = sock->local;
1025
1026         pr_debug("Remote ready %d tx queue len %d remote rw %d",
1027                  sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1028                  sock->remote_rw);
1029
1030         /* Try to queue some I frames for transmission */
1031         while (sock->remote_ready &&
1032                skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1033                 struct sk_buff *pdu;
1034
1035                 pdu = skb_dequeue(&sock->tx_queue);
1036                 if (pdu == NULL)
1037                         break;
1038
1039                 /* Update N(S)/N(R) */
1040                 nfc_llcp_set_nrns(sock, pdu);
1041
1042                 skb_queue_tail(&local->tx_queue, pdu);
1043                 nr_frames++;
1044         }
1045
1046         return nr_frames;
1047 }
1048
1049 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1050                                struct sk_buff *skb)
1051 {
1052         struct nfc_llcp_sock *llcp_sock;
1053         struct sock *sk;
1054         u8 dsap, ssap, ptype, ns, nr;
1055
1056         ptype = nfc_llcp_ptype(skb);
1057         dsap = nfc_llcp_dsap(skb);
1058         ssap = nfc_llcp_ssap(skb);
1059         ns = nfc_llcp_ns(skb);
1060         nr = nfc_llcp_nr(skb);
1061
1062         pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1063
1064         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1065         if (llcp_sock == NULL) {
1066                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1067                 return;
1068         }
1069
1070         sk = &llcp_sock->sk;
1071         lock_sock(sk);
1072         if (sk->sk_state == LLCP_CLOSED) {
1073                 release_sock(sk);
1074                 nfc_llcp_sock_put(llcp_sock);
1075         }
1076
1077         /* Pass the payload upstream */
1078         if (ptype == LLCP_PDU_I) {
1079                 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1080
1081                 if (ns == llcp_sock->recv_n)
1082                         llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1083                 else
1084                         pr_err("Received out of sequence I PDU\n");
1085
1086                 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1087                 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1088                         /*
1089                          * I frames will be freed from the socket layer, so we
1090                          * need to keep them alive until someone receives them.
1091                          */
1092                         skb_get(skb);
1093                 } else {
1094                         pr_err("Receive queue is full\n");
1095                 }
1096         }
1097
1098         /* Remove skbs from the pending queue */
1099         if (llcp_sock->send_ack_n != nr) {
1100                 struct sk_buff *s, *tmp;
1101                 u8 n;
1102
1103                 llcp_sock->send_ack_n = nr;
1104
1105                 /* Remove and free all skbs until ns == nr */
1106                 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1107                         n = nfc_llcp_ns(s);
1108
1109                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1110                         kfree_skb(s);
1111
1112                         if (n == nr)
1113                                 break;
1114                 }
1115
1116                 /* Re-queue the remaining skbs for transmission */
1117                 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1118                                             s, tmp) {
1119                         skb_unlink(s, &llcp_sock->tx_pending_queue);
1120                         skb_queue_head(&local->tx_queue, s);
1121                 }
1122         }
1123
1124         if (ptype == LLCP_PDU_RR)
1125                 llcp_sock->remote_ready = true;
1126         else if (ptype == LLCP_PDU_RNR)
1127                 llcp_sock->remote_ready = false;
1128
1129         if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1130                 nfc_llcp_send_rr(llcp_sock);
1131
1132         release_sock(sk);
1133         nfc_llcp_sock_put(llcp_sock);
1134 }
1135
1136 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1137                                const struct sk_buff *skb)
1138 {
1139         struct nfc_llcp_sock *llcp_sock;
1140         struct sock *sk;
1141         u8 dsap, ssap;
1142
1143         dsap = nfc_llcp_dsap(skb);
1144         ssap = nfc_llcp_ssap(skb);
1145
1146         if ((dsap == 0) && (ssap == 0)) {
1147                 pr_debug("Connection termination");
1148                 nfc_dep_link_down(local->dev);
1149                 return;
1150         }
1151
1152         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1153         if (llcp_sock == NULL) {
1154                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1155                 return;
1156         }
1157
1158         sk = &llcp_sock->sk;
1159         lock_sock(sk);
1160
1161         nfc_llcp_socket_purge(llcp_sock);
1162
1163         if (sk->sk_state == LLCP_CLOSED) {
1164                 release_sock(sk);
1165                 nfc_llcp_sock_put(llcp_sock);
1166         }
1167
1168         if (sk->sk_state == LLCP_CONNECTED) {
1169                 nfc_put_device(local->dev);
1170                 sk->sk_state = LLCP_CLOSED;
1171                 sk->sk_state_change(sk);
1172         }
1173
1174         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1175
1176         release_sock(sk);
1177         nfc_llcp_sock_put(llcp_sock);
1178 }
1179
1180 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
1181                              const struct sk_buff *skb)
1182 {
1183         struct nfc_llcp_sock *llcp_sock;
1184         struct sock *sk;
1185         u8 dsap, ssap;
1186
1187         dsap = nfc_llcp_dsap(skb);
1188         ssap = nfc_llcp_ssap(skb);
1189
1190         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1191         if (llcp_sock == NULL) {
1192                 pr_err("Invalid CC\n");
1193                 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1194
1195                 return;
1196         }
1197
1198         sk = &llcp_sock->sk;
1199
1200         /* Unlink from connecting and link to the client array */
1201         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1202         nfc_llcp_sock_link(&local->sockets, sk);
1203         llcp_sock->dsap = ssap;
1204
1205         nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1206                                       skb->len - LLCP_HEADER_SIZE);
1207
1208         sk->sk_state = LLCP_CONNECTED;
1209         sk->sk_state_change(sk);
1210
1211         nfc_llcp_sock_put(llcp_sock);
1212 }
1213
1214 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
1215                              const struct sk_buff *skb)
1216 {
1217         struct nfc_llcp_sock *llcp_sock;
1218         struct sock *sk;
1219         u8 dsap, ssap, reason;
1220
1221         dsap = nfc_llcp_dsap(skb);
1222         ssap = nfc_llcp_ssap(skb);
1223         reason = skb->data[2];
1224
1225         pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1226
1227         switch (reason) {
1228         case LLCP_DM_NOBOUND:
1229         case LLCP_DM_REJ:
1230                 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1231                 break;
1232
1233         default:
1234                 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1235                 break;
1236         }
1237
1238         if (llcp_sock == NULL) {
1239                 pr_debug("Already closed\n");
1240                 return;
1241         }
1242
1243         sk = &llcp_sock->sk;
1244
1245         sk->sk_err = ENXIO;
1246         sk->sk_state = LLCP_CLOSED;
1247         sk->sk_state_change(sk);
1248
1249         nfc_llcp_sock_put(llcp_sock);
1250 }
1251
1252 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1253                               const struct sk_buff *skb)
1254 {
1255         struct nfc_llcp_sock *llcp_sock;
1256         u8 dsap, ssap, type, length, tid, sap;
1257         const u8 *tlv;
1258         u16 tlv_len, offset;
1259         const char *service_name;
1260         size_t service_name_len;
1261         struct nfc_llcp_sdp_tlv *sdp;
1262         HLIST_HEAD(llc_sdres_list);
1263         size_t sdres_tlvs_len;
1264         HLIST_HEAD(nl_sdres_list);
1265
1266         dsap = nfc_llcp_dsap(skb);
1267         ssap = nfc_llcp_ssap(skb);
1268
1269         pr_debug("%d %d\n", dsap, ssap);
1270
1271         if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1272                 pr_err("Wrong SNL SAP\n");
1273                 return;
1274         }
1275
1276         tlv = &skb->data[LLCP_HEADER_SIZE];
1277         tlv_len = skb->len - LLCP_HEADER_SIZE;
1278         offset = 0;
1279         sdres_tlvs_len = 0;
1280
1281         while (offset < tlv_len) {
1282                 type = tlv[0];
1283                 length = tlv[1];
1284
1285                 switch (type) {
1286                 case LLCP_TLV_SDREQ:
1287                         tid = tlv[2];
1288                         service_name = (char *) &tlv[3];
1289                         service_name_len = length - 1;
1290
1291                         pr_debug("Looking for %.16s\n", service_name);
1292
1293                         if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1294                             !strncmp(service_name, "urn:nfc:sn:sdp",
1295                                      service_name_len)) {
1296                                 sap = 1;
1297                                 goto add_snl;
1298                         }
1299
1300                         llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1301                                                           service_name_len);
1302                         if (!llcp_sock) {
1303                                 sap = 0;
1304                                 goto add_snl;
1305                         }
1306
1307                         /*
1308                          * We found a socket but its ssap has not been reserved
1309                          * yet. We need to assign it for good and send a reply.
1310                          * The ssap will be freed when the socket is closed.
1311                          */
1312                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1313                                 atomic_t *client_count;
1314
1315                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1316
1317                                 pr_debug("Reserving %d\n", sap);
1318
1319                                 if (sap == LLCP_SAP_MAX) {
1320                                         sap = 0;
1321                                         goto add_snl;
1322                                 }
1323
1324                                 client_count =
1325                                         &local->local_sdp_cnt[sap -
1326                                                               LLCP_WKS_NUM_SAP];
1327
1328                                 atomic_inc(client_count);
1329
1330                                 llcp_sock->ssap = sap;
1331                                 llcp_sock->reserved_ssap = sap;
1332                         } else {
1333                                 sap = llcp_sock->ssap;
1334                         }
1335
1336                         pr_debug("%p %d\n", llcp_sock, sap);
1337
1338 add_snl:
1339                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1340                         if (sdp == NULL)
1341                                 goto exit;
1342
1343                         sdres_tlvs_len += sdp->tlv_len;
1344                         hlist_add_head(&sdp->node, &llc_sdres_list);
1345                         break;
1346
1347                 case LLCP_TLV_SDRES:
1348                         mutex_lock(&local->sdreq_lock);
1349
1350                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1351
1352                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1353                                 if (sdp->tid != tlv[2])
1354                                         continue;
1355
1356                                 sdp->sap = tlv[3];
1357
1358                                 pr_debug("Found: uri=%s, sap=%d\n",
1359                                          sdp->uri, sdp->sap);
1360
1361                                 hlist_del(&sdp->node);
1362
1363                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1364
1365                                 break;
1366                         }
1367
1368                         mutex_unlock(&local->sdreq_lock);
1369                         break;
1370
1371                 default:
1372                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1373                         break;
1374                 }
1375
1376                 offset += length + 2;
1377                 tlv += length + 2;
1378         }
1379
1380 exit:
1381         if (!hlist_empty(&nl_sdres_list))
1382                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1383
1384         if (!hlist_empty(&llc_sdres_list))
1385                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1386 }
1387
1388 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1389 {
1390         u8 ptype;
1391         u16 pdu_len;
1392         struct sk_buff *new_skb;
1393
1394         if (skb->len <= LLCP_HEADER_SIZE) {
1395                 pr_err("Malformed AGF PDU\n");
1396                 return;
1397         }
1398
1399         skb_pull(skb, LLCP_HEADER_SIZE);
1400
1401         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1402                 pdu_len = skb->data[0] << 8 | skb->data[1];
1403
1404                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1405
1406                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1407                         pr_err("Malformed AGF PDU\n");
1408                         return;
1409                 }
1410
1411                 ptype = nfc_llcp_ptype(skb);
1412
1413                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1414                         goto next;
1415
1416                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1417                 if (new_skb == NULL) {
1418                         pr_err("Could not allocate PDU\n");
1419                         return;
1420                 }
1421
1422                 skb_put_data(new_skb, skb->data, pdu_len);
1423
1424                 nfc_llcp_rx_skb(local, new_skb);
1425
1426                 kfree_skb(new_skb);
1427 next:
1428                 skb_pull(skb, pdu_len);
1429         }
1430 }
1431
1432 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1433 {
1434         u8 dsap, ssap, ptype;
1435
1436         ptype = nfc_llcp_ptype(skb);
1437         dsap = nfc_llcp_dsap(skb);
1438         ssap = nfc_llcp_ssap(skb);
1439
1440         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1441
1442         if (ptype != LLCP_PDU_SYMM)
1443                 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1444                                      skb->data, skb->len, true);
1445
1446         switch (ptype) {
1447         case LLCP_PDU_SYMM:
1448                 pr_debug("SYMM\n");
1449                 break;
1450
1451         case LLCP_PDU_UI:
1452                 pr_debug("UI\n");
1453                 nfc_llcp_recv_ui(local, skb);
1454                 break;
1455
1456         case LLCP_PDU_CONNECT:
1457                 pr_debug("CONNECT\n");
1458                 nfc_llcp_recv_connect(local, skb);
1459                 break;
1460
1461         case LLCP_PDU_DISC:
1462                 pr_debug("DISC\n");
1463                 nfc_llcp_recv_disc(local, skb);
1464                 break;
1465
1466         case LLCP_PDU_CC:
1467                 pr_debug("CC\n");
1468                 nfc_llcp_recv_cc(local, skb);
1469                 break;
1470
1471         case LLCP_PDU_DM:
1472                 pr_debug("DM\n");
1473                 nfc_llcp_recv_dm(local, skb);
1474                 break;
1475
1476         case LLCP_PDU_SNL:
1477                 pr_debug("SNL\n");
1478                 nfc_llcp_recv_snl(local, skb);
1479                 break;
1480
1481         case LLCP_PDU_I:
1482         case LLCP_PDU_RR:
1483         case LLCP_PDU_RNR:
1484                 pr_debug("I frame\n");
1485                 nfc_llcp_recv_hdlc(local, skb);
1486                 break;
1487
1488         case LLCP_PDU_AGF:
1489                 pr_debug("AGF frame\n");
1490                 nfc_llcp_recv_agf(local, skb);
1491                 break;
1492         }
1493 }
1494
1495 static void nfc_llcp_rx_work(struct work_struct *work)
1496 {
1497         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1498                                                     rx_work);
1499         struct sk_buff *skb;
1500
1501         skb = local->rx_pending;
1502         if (skb == NULL) {
1503                 pr_debug("No pending SKB\n");
1504                 return;
1505         }
1506
1507         __net_timestamp(skb);
1508
1509         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1510
1511         nfc_llcp_rx_skb(local, skb);
1512
1513         schedule_work(&local->tx_work);
1514         kfree_skb(local->rx_pending);
1515         local->rx_pending = NULL;
1516 }
1517
1518 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1519 {
1520         local->rx_pending = skb;
1521         del_timer(&local->link_timer);
1522         schedule_work(&local->rx_work);
1523 }
1524
1525 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1526 {
1527         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1528
1529         if (err < 0) {
1530                 pr_err("LLCP PDU receive err %d\n", err);
1531                 return;
1532         }
1533
1534         __nfc_llcp_recv(local, skb);
1535 }
1536
1537 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1538 {
1539         struct nfc_llcp_local *local;
1540
1541         local = nfc_llcp_find_local(dev);
1542         if (local == NULL) {
1543                 kfree_skb(skb);
1544                 return -ENODEV;
1545         }
1546
1547         __nfc_llcp_recv(local, skb);
1548
1549         nfc_llcp_local_put(local);
1550
1551         return 0;
1552 }
1553
1554 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1555 {
1556         struct nfc_llcp_local *local;
1557
1558         local = nfc_llcp_find_local(dev);
1559         if (local == NULL)
1560                 return;
1561
1562         local->remote_miu = LLCP_DEFAULT_MIU;
1563         local->remote_lto = LLCP_DEFAULT_LTO;
1564
1565         /* Close and purge all existing sockets */
1566         nfc_llcp_socket_release(local, true, 0);
1567
1568         nfc_llcp_local_put(local);
1569 }
1570
1571 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1572                         u8 comm_mode, u8 rf_mode)
1573 {
1574         struct nfc_llcp_local *local;
1575
1576         pr_debug("rf mode %d\n", rf_mode);
1577
1578         local = nfc_llcp_find_local(dev);
1579         if (local == NULL)
1580                 return;
1581
1582         local->target_idx = target_idx;
1583         local->comm_mode = comm_mode;
1584         local->rf_mode = rf_mode;
1585
1586         if (rf_mode == NFC_RF_INITIATOR) {
1587                 pr_debug("Queueing Tx work\n");
1588
1589                 schedule_work(&local->tx_work);
1590         } else {
1591                 mod_timer(&local->link_timer,
1592                           jiffies + msecs_to_jiffies(local->remote_lto));
1593         }
1594
1595         nfc_llcp_local_put(local);
1596 }
1597
1598 int nfc_llcp_register_device(struct nfc_dev *ndev)
1599 {
1600         struct nfc_llcp_local *local;
1601
1602         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1603         if (local == NULL)
1604                 return -ENOMEM;
1605
1606         local->dev = ndev;
1607         INIT_LIST_HEAD(&local->list);
1608         kref_init(&local->ref);
1609         mutex_init(&local->sdp_lock);
1610         timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1611
1612         skb_queue_head_init(&local->tx_queue);
1613         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1614
1615         local->rx_pending = NULL;
1616         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1617
1618         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1619
1620         rwlock_init(&local->sockets.lock);
1621         rwlock_init(&local->connecting_sockets.lock);
1622         rwlock_init(&local->raw_sockets.lock);
1623
1624         local->lto = 150; /* 1500 ms */
1625         local->rw = LLCP_MAX_RW;
1626         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1627         local->local_wks = 0x1; /* LLC Link Management */
1628
1629         nfc_llcp_build_gb(local);
1630
1631         local->remote_miu = LLCP_DEFAULT_MIU;
1632         local->remote_lto = LLCP_DEFAULT_LTO;
1633
1634         mutex_init(&local->sdreq_lock);
1635         INIT_HLIST_HEAD(&local->pending_sdreqs);
1636         timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1637         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1638
1639         list_add(&local->list, &llcp_devices);
1640
1641         return 0;
1642 }
1643
1644 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1645 {
1646         struct nfc_llcp_local *local = nfc_llcp_remove_local(dev);
1647
1648         if (local == NULL) {
1649                 pr_debug("No such device\n");
1650                 return;
1651         }
1652
1653         local_cleanup(local);
1654
1655         nfc_llcp_local_put(local);
1656 }
1657
1658 int __init nfc_llcp_init(void)
1659 {
1660         return nfc_llcp_sock_init();
1661 }
1662
1663 void nfc_llcp_exit(void)
1664 {
1665         nfc_llcp_sock_exit();
1666 }