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         pr_debug("%p\n", &sock->sk);
  51
  52         skb_queue_purge(&sock->tx_queue);
  53         skb_queue_purge(&sock->tx_pending_queue);
  54
  55         if (local == NULL)
  56                 return;
  57
  58         /* Search for local pending SKBs that are related to this socket */
  59         skb_queue_walk_safe(&local->tx_queue, s, tmp) {
  60                 if (s->sk != &sock->sk)
  61                         continue;
  62
  63                 skb_unlink(s, &local->tx_queue);
  64                 kfree_skb(s);
  65         }
  66 }
  67
  68 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
  69                                     int err)
  70 {
  71         struct sock *sk;
  72         struct hlist_node *tmp;
  73         struct nfc_llcp_sock *llcp_sock;
  74
  75         skb_queue_purge(&local->tx_queue);
  76
  77         write_lock(&local->sockets.lock);
  78
  79         sk_for_each_safe(sk, tmp, &local->sockets.head) {
  80                 llcp_sock = nfc_llcp_sock(sk);
  81
  82                 bh_lock_sock(sk);
  83
  84                 nfc_llcp_socket_purge(llcp_sock);
  85
  86                 if (sk->sk_state == LLCP_CONNECTED)
  87                         nfc_put_device(llcp_sock->dev);
  88
  89                 if (sk->sk_state == LLCP_LISTEN) {
  90                         struct nfc_llcp_sock *lsk, *n;
  91                         struct sock *accept_sk;
  92
  93                         list_for_each_entry_safe(lsk, n,
  94                                                  &llcp_sock->accept_queue,
  95                                                  accept_queue) {
  96                                 accept_sk = &lsk->sk;
  97                                 bh_lock_sock(accept_sk);
  98
  99                                 nfc_llcp_accept_unlink(accept_sk);
 100
 101                                 if (err)
 102                                         accept_sk->sk_err = err;
 103                                 accept_sk->sk_state = LLCP_CLOSED;
 104                                 accept_sk->sk_state_change(sk);
 105
 106                                 bh_unlock_sock(accept_sk);
 107                         }
 108                 }
 109
 110                 if (err)
 111                         sk->sk_err = err;
 112                 sk->sk_state = LLCP_CLOSED;
 113                 sk->sk_state_change(sk);
 114
 115                 bh_unlock_sock(sk);
 116
 117                 sk_del_node_init(sk);
 118         }
 119
 120         write_unlock(&local->sockets.lock);
 121
 122         /* If we still have a device, we keep the RAW sockets alive */
 123         if (device == true)
 124                 return;
 125
 126         write_lock(&local->raw_sockets.lock);
 127
 128         sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
 129                 llcp_sock = nfc_llcp_sock(sk);
 130
 131                 bh_lock_sock(sk);
 132
 133                 nfc_llcp_socket_purge(llcp_sock);
 134
 135                 if (err)
 136                         sk->sk_err = err;
 137                 sk->sk_state = LLCP_CLOSED;
 138                 sk->sk_state_change(sk);
 139
 140                 bh_unlock_sock(sk);
 141
 142                 sk_del_node_init(sk);
 143         }
 144
 145         write_unlock(&local->raw_sockets.lock);
 146 }
 147
 148 static struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
 149 {
 150         kref_get(&local->ref);
 151
 152         return local;
 153 }
 154
 155 static void local_cleanup(struct nfc_llcp_local *local)
 156 {
 157         nfc_llcp_socket_release(local, false, ENXIO);
 158         del_timer_sync(&local->link_timer);
 159         skb_queue_purge(&local->tx_queue);
 160         cancel_work_sync(&local->tx_work);
 161         cancel_work_sync(&local->rx_work);
 162         cancel_work_sync(&local->timeout_work);
 163         kfree_skb(local->rx_pending);
 164         local->rx_pending = NULL;
 165         del_timer_sync(&local->sdreq_timer);
 166         cancel_work_sync(&local->sdreq_timeout_work);
 167         nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
 168 }
 169
 170 static void local_release(struct kref *ref)
 171 {
 172         struct nfc_llcp_local *local;
 173
 174         local = container_of(ref, struct nfc_llcp_local, ref);
 175
 176         local_cleanup(local);
 177         kfree(local);
 178 }
 179
 180 int nfc_llcp_local_put(struct nfc_llcp_local *local)
 181 {
 182         if (local == NULL)
 183                 return 0;
 184
 185         return kref_put(&local->ref, local_release);
 186 }
 187
 188 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
 189                                                u8 ssap, u8 dsap)
 190 {
 191         struct sock *sk;
 192         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 193
 194         pr_debug("ssap dsap %d %d\n", ssap, dsap);
 195
 196         if (ssap == 0 && dsap == 0)
 197                 return NULL;
 198
 199         read_lock(&local->sockets.lock);
 200
 201         llcp_sock = NULL;
 202
 203         sk_for_each(sk, &local->sockets.head) {
 204                 tmp_sock = nfc_llcp_sock(sk);
 205
 206                 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
 207                         llcp_sock = tmp_sock;
 208                         sock_hold(&llcp_sock->sk);
 209                         break;
 210                 }
 211         }
 212
 213         read_unlock(&local->sockets.lock);
 214
 215         return llcp_sock;
 216 }
 217
 218 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
 219 {
 220         sock_put(&sock->sk);
 221 }
 222
 223 static void nfc_llcp_timeout_work(struct work_struct *work)
 224 {
 225         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 226                                                     timeout_work);
 227
 228         nfc_dep_link_down(local->dev);
 229 }
 230
 231 static void nfc_llcp_symm_timer(struct timer_list *t)
 232 {
 233         struct nfc_llcp_local *local = from_timer(local, t, link_timer);
 234
 235         pr_err("SYMM timeout\n");
 236
 237         schedule_work(&local->timeout_work);
 238 }
 239
 240 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
 241 {
 242         unsigned long time;
 243         HLIST_HEAD(nl_sdres_list);
 244         struct hlist_node *n;
 245         struct nfc_llcp_sdp_tlv *sdp;
 246         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 247                                                     sdreq_timeout_work);
 248
 249         mutex_lock(&local->sdreq_lock);
 250
 251         time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
 252
 253         hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
 254                 if (time_after(sdp->time, time))
 255                         continue;
 256
 257                 sdp->sap = LLCP_SDP_UNBOUND;
 258
 259                 hlist_del(&sdp->node);
 260
 261                 hlist_add_head(&sdp->node, &nl_sdres_list);
 262         }
 263
 264         if (!hlist_empty(&local->pending_sdreqs))
 265                 mod_timer(&local->sdreq_timer,
 266                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
 267
 268         mutex_unlock(&local->sdreq_lock);
 269
 270         if (!hlist_empty(&nl_sdres_list))
 271                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
 272 }
 273
 274 static void nfc_llcp_sdreq_timer(struct timer_list *t)
 275 {
 276         struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
 277
 278         schedule_work(&local->sdreq_timeout_work);
 279 }
 280
 281 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
 282 {
 283         struct nfc_llcp_local *local;
 284         struct nfc_llcp_local *res = NULL;
 285
 286         spin_lock(&llcp_devices_lock);
 287         list_for_each_entry(local, &llcp_devices, list)
 288                 if (local->dev == dev) {
 289                         res = nfc_llcp_local_get(local);
 290                         break;
 291                 }
 292         spin_unlock(&llcp_devices_lock);
 293
 294         return res;
 295 }
 296
 297 static struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev)
 298 {
 299         struct nfc_llcp_local *local, *tmp;
 300
 301         spin_lock(&llcp_devices_lock);
 302         list_for_each_entry_safe(local, tmp, &llcp_devices, list)
 303                 if (local->dev == dev) {
 304                         list_del(&local->list);
 305                         spin_unlock(&llcp_devices_lock);
 306                         return local;
 307                 }
 308         spin_unlock(&llcp_devices_lock);
 309
 310         pr_warn("Shutting down device not found\n");
 311
 312         return NULL;
 313 }
 314
 315 static char *wks[] = {
 316         NULL,
 317         NULL, /* SDP */
 318         "urn:nfc:sn:ip",
 319         "urn:nfc:sn:obex",
 320         "urn:nfc:sn:snep",
 321 };
 322
 323 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
 324 {
 325         int sap, num_wks;
 326
 327         pr_debug("%s\n", service_name);
 328
 329         if (service_name == NULL)
 330                 return -EINVAL;
 331
 332         num_wks = ARRAY_SIZE(wks);
 333
 334         for (sap = 0; sap < num_wks; sap++) {
 335                 if (wks[sap] == NULL)
 336                         continue;
 337
 338                 if (strncmp(wks[sap], service_name, service_name_len) == 0)
 339                         return sap;
 340         }
 341
 342         return -EINVAL;
 343 }
 344
 345 static
 346 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
 347                                             const u8 *sn, size_t sn_len,
 348                                             bool needref)
 349 {
 350         struct sock *sk;
 351         struct nfc_llcp_sock *llcp_sock, *tmp_sock;
 352
 353         pr_debug("sn %zd %p\n", sn_len, sn);
 354
 355         if (sn == NULL || sn_len == 0)
 356                 return NULL;
 357
 358         read_lock(&local->sockets.lock);
 359
 360         llcp_sock = NULL;
 361
 362         sk_for_each(sk, &local->sockets.head) {
 363                 tmp_sock = nfc_llcp_sock(sk);
 364
 365                 pr_debug("llcp sock %p\n", tmp_sock);
 366
 367                 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
 368                     tmp_sock->sk.sk_state != LLCP_LISTEN)
 369                         continue;
 370
 371                 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
 372                     tmp_sock->sk.sk_state != LLCP_BOUND)
 373                         continue;
 374
 375                 if (tmp_sock->service_name == NULL ||
 376                     tmp_sock->service_name_len == 0)
 377                         continue;
 378
 379                 if (tmp_sock->service_name_len != sn_len)
 380                         continue;
 381
 382                 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
 383                         llcp_sock = tmp_sock;
 384                         if (needref)
 385                                 sock_hold(&llcp_sock->sk);
 386                         break;
 387                 }
 388         }
 389
 390         read_unlock(&local->sockets.lock);
 391
 392         pr_debug("Found llcp sock %p\n", llcp_sock);
 393
 394         return llcp_sock;
 395 }
 396
 397 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 398                          struct nfc_llcp_sock *sock)
 399 {
 400         mutex_lock(&local->sdp_lock);
 401
 402         if (sock->service_name != NULL && sock->service_name_len > 0) {
 403                 int ssap = nfc_llcp_wks_sap(sock->service_name,
 404                                             sock->service_name_len);
 405
 406                 if (ssap > 0) {
 407                         pr_debug("WKS %d\n", ssap);
 408
 409                         /* This is a WKS, let's check if it's free */
 410                         if (local->local_wks & BIT(ssap)) {
 411                                 mutex_unlock(&local->sdp_lock);
 412
 413                                 return LLCP_SAP_MAX;
 414                         }
 415
 416                         set_bit(ssap, &local->local_wks);
 417                         mutex_unlock(&local->sdp_lock);
 418
 419                         return ssap;
 420                 }
 421
 422                 /*
 423                  * Check if there already is a non WKS socket bound
 424                  * to this service name.
 425                  */
 426                 if (nfc_llcp_sock_from_sn(local, sock->service_name,
 427                                           sock->service_name_len,
 428                                           false) != NULL) {
 429                         mutex_unlock(&local->sdp_lock);
 430
 431                         return LLCP_SAP_MAX;
 432                 }
 433
 434                 mutex_unlock(&local->sdp_lock);
 435
 436                 return LLCP_SDP_UNBOUND;
 437
 438         } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
 439                 if (!test_bit(sock->ssap, &local->local_wks)) {
 440                         set_bit(sock->ssap, &local->local_wks);
 441                         mutex_unlock(&local->sdp_lock);
 442
 443                         return sock->ssap;
 444                 }
 445         }
 446
 447         mutex_unlock(&local->sdp_lock);
 448
 449         return LLCP_SAP_MAX;
 450 }
 451
 452 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
 453 {
 454         u8 local_ssap;
 455
 456         mutex_lock(&local->sdp_lock);
 457
 458         local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
 459         if (local_ssap == LLCP_LOCAL_NUM_SAP) {
 460                 mutex_unlock(&local->sdp_lock);
 461                 return LLCP_SAP_MAX;
 462         }
 463
 464         set_bit(local_ssap, &local->local_sap);
 465
 466         mutex_unlock(&local->sdp_lock);
 467
 468         return local_ssap + LLCP_LOCAL_SAP_OFFSET;
 469 }
 470
 471 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
 472 {
 473         u8 local_ssap;
 474         unsigned long *sdp;
 475
 476         if (ssap < LLCP_WKS_NUM_SAP) {
 477                 local_ssap = ssap;
 478                 sdp = &local->local_wks;
 479         } else if (ssap < LLCP_LOCAL_NUM_SAP) {
 480                 atomic_t *client_cnt;
 481
 482                 local_ssap = ssap - LLCP_WKS_NUM_SAP;
 483                 sdp = &local->local_sdp;
 484                 client_cnt = &local->local_sdp_cnt[local_ssap];
 485
 486                 pr_debug("%d clients\n", atomic_read(client_cnt));
 487
 488                 mutex_lock(&local->sdp_lock);
 489
 490                 if (atomic_dec_and_test(client_cnt)) {
 491                         struct nfc_llcp_sock *l_sock;
 492
 493                         pr_debug("No more clients for SAP %d\n", ssap);
 494
 495                         clear_bit(local_ssap, sdp);
 496
 497                         /* Find the listening sock and set it back to UNBOUND */
 498                         l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
 499                         if (l_sock) {
 500                                 l_sock->ssap = LLCP_SDP_UNBOUND;
 501                                 nfc_llcp_sock_put(l_sock);
 502                         }
 503                 }
 504
 505                 mutex_unlock(&local->sdp_lock);
 506
 507                 return;
 508         } else if (ssap < LLCP_MAX_SAP) {
 509                 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
 510                 sdp = &local->local_sap;
 511         } else {
 512                 return;
 513         }
 514
 515         mutex_lock(&local->sdp_lock);
 516
 517         clear_bit(local_ssap, sdp);
 518
 519         mutex_unlock(&local->sdp_lock);
 520 }
 521
 522 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
 523 {
 524         u8 ssap;
 525
 526         mutex_lock(&local->sdp_lock);
 527
 528         ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
 529         if (ssap == LLCP_SDP_NUM_SAP) {
 530                 mutex_unlock(&local->sdp_lock);
 531
 532                 return LLCP_SAP_MAX;
 533         }
 534
 535         pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
 536
 537         set_bit(ssap, &local->local_sdp);
 538
 539         mutex_unlock(&local->sdp_lock);
 540
 541         return LLCP_WKS_NUM_SAP + ssap;
 542 }
 543
 544 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
 545 {
 546         u8 *gb_cur, version, version_length;
 547         u8 lto_length, wks_length, miux_length;
 548         const u8 *version_tlv = NULL, *lto_tlv = NULL,
 549            *wks_tlv = NULL, *miux_tlv = NULL;
 550         __be16 wks = cpu_to_be16(local->local_wks);
 551         u8 gb_len = 0;
 552         int ret = 0;
 553
 554         version = LLCP_VERSION_11;
 555         version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
 556                                          1, &version_length);
 557         if (!version_tlv) {
 558                 ret = -ENOMEM;
 559                 goto out;
 560         }
 561         gb_len += version_length;
 562
 563         lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
 564         if (!lto_tlv) {
 565                 ret = -ENOMEM;
 566                 goto out;
 567         }
 568         gb_len += lto_length;
 569
 570         pr_debug("Local wks 0x%lx\n", local->local_wks);
 571         wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
 572         if (!wks_tlv) {
 573                 ret = -ENOMEM;
 574                 goto out;
 575         }
 576         gb_len += wks_length;
 577
 578         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
 579                                       &miux_length);
 580         if (!miux_tlv) {
 581                 ret = -ENOMEM;
 582                 goto out;
 583         }
 584         gb_len += miux_length;
 585
 586         gb_len += ARRAY_SIZE(llcp_magic);
 587
 588         if (gb_len > NFC_MAX_GT_LEN) {
 589                 ret = -EINVAL;
 590                 goto out;
 591         }
 592
 593         gb_cur = local->gb;
 594
 595         memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
 596         gb_cur += ARRAY_SIZE(llcp_magic);
 597
 598         memcpy(gb_cur, version_tlv, version_length);
 599         gb_cur += version_length;
 600
 601         memcpy(gb_cur, lto_tlv, lto_length);
 602         gb_cur += lto_length;
 603
 604         memcpy(gb_cur, wks_tlv, wks_length);
 605         gb_cur += wks_length;
 606
 607         memcpy(gb_cur, miux_tlv, miux_length);
 608         gb_cur += miux_length;
 609
 610         local->gb_len = gb_len;
 611
 612 out:
 613         kfree(version_tlv);
 614         kfree(lto_tlv);
 615         kfree(wks_tlv);
 616         kfree(miux_tlv);
 617
 618         return ret;
 619 }
 620
 621 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
 622 {
 623         struct nfc_llcp_local *local;
 624
 625         local = nfc_llcp_find_local(dev);
 626         if (local == NULL) {
 627                 *general_bytes_len = 0;
 628                 return NULL;
 629         }
 630
 631         nfc_llcp_build_gb(local);
 632
 633         *general_bytes_len = local->gb_len;
 634
 635         nfc_llcp_local_put(local);
 636
 637         return local->gb;
 638 }
 639
 640 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
 641 {
 642         struct nfc_llcp_local *local;
 643         int err;
 644
 645         if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
 646                 return -EINVAL;
 647
 648         local = nfc_llcp_find_local(dev);
 649         if (local == NULL) {
 650                 pr_err("No LLCP device\n");
 651                 return -ENODEV;
 652         }
 653
 654         memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
 655         memcpy(local->remote_gb, gb, gb_len);
 656         local->remote_gb_len = gb_len;
 657
 658         if (memcmp(local->remote_gb, llcp_magic, 3)) {
 659                 pr_err("MAC does not support LLCP\n");
 660                 err = -EINVAL;
 661                 goto out;
 662         }
 663
 664         err = nfc_llcp_parse_gb_tlv(local,
 665                                      &local->remote_gb[3],
 666                                      local->remote_gb_len - 3);
 667 out:
 668         nfc_llcp_local_put(local);
 669         return err;
 670 }
 671
 672 static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
 673 {
 674         return (pdu->data[0] & 0xfc) >> 2;
 675 }
 676
 677 static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
 678 {
 679         return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
 680 }
 681
 682 static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
 683 {
 684         return pdu->data[1] & 0x3f;
 685 }
 686
 687 static u8 nfc_llcp_ns(const struct sk_buff *pdu)
 688 {
 689         return pdu->data[2] >> 4;
 690 }
 691
 692 static u8 nfc_llcp_nr(const struct sk_buff *pdu)
 693 {
 694         return pdu->data[2] & 0xf;
 695 }
 696
 697 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
 698 {
 699         pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
 700         sock->send_n = (sock->send_n + 1) % 16;
 701         sock->recv_ack_n = (sock->recv_n - 1) % 16;
 702 }
 703
 704 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 705                                struct sk_buff *skb, u8 direction)
 706 {
 707         struct sk_buff *skb_copy = NULL, *nskb;
 708         struct sock *sk;
 709         u8 *data;
 710
 711         read_lock(&local->raw_sockets.lock);
 712
 713         sk_for_each(sk, &local->raw_sockets.head) {
 714                 if (sk->sk_state != LLCP_BOUND)
 715                         continue;
 716
 717                 if (skb_copy == NULL) {
 718                         skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
 719                                                       GFP_ATOMIC, true);
 720
 721                         if (skb_copy == NULL)
 722                                 continue;
 723
 724                         data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
 725
 726                         data[0] = local->dev ? local->dev->idx : 0xFF;
 727                         data[1] = direction & 0x01;
 728                         data[1] |= (RAW_PAYLOAD_LLCP << 1);
 729                 }
 730
 731                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 732                 if (!nskb)
 733                         continue;
 734
 735                 if (sock_queue_rcv_skb(sk, nskb))
 736                         kfree_skb(nskb);
 737         }
 738
 739         read_unlock(&local->raw_sockets.lock);
 740
 741         kfree_skb(skb_copy);
 742 }
 743
 744 static void nfc_llcp_tx_work(struct work_struct *work)
 745 {
 746         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
 747                                                     tx_work);
 748         struct sk_buff *skb;
 749         struct sock *sk;
 750         struct nfc_llcp_sock *llcp_sock;
 751
 752         skb = skb_dequeue(&local->tx_queue);
 753         if (skb != NULL) {
 754                 sk = skb->sk;
 755                 llcp_sock = nfc_llcp_sock(sk);
 756
 757                 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
 758                         kfree_skb(skb);
 759                         nfc_llcp_send_symm(local->dev);
 760                 } else if (llcp_sock && !llcp_sock->remote_ready) {
 761                         skb_queue_head(&local->tx_queue, skb);
 762                         nfc_llcp_send_symm(local->dev);
 763                 } else {
 764                         struct sk_buff *copy_skb = NULL;
 765                         u8 ptype = nfc_llcp_ptype(skb);
 766                         int ret;
 767
 768                         pr_debug("Sending pending skb\n");
 769                         print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
 770                                              16, 1, skb->data, skb->len, true);
 771
 772                         if (ptype == LLCP_PDU_DISC && sk != NULL &&
 773                             sk->sk_state == LLCP_DISCONNECTING) {
 774                                 nfc_llcp_sock_unlink(&local->sockets, sk);
 775                                 sock_orphan(sk);
 776                                 sock_put(sk);
 777                         }
 778
 779                         if (ptype == LLCP_PDU_I)
 780                                 copy_skb = skb_copy(skb, GFP_ATOMIC);
 781
 782                         __net_timestamp(skb);
 783
 784                         nfc_llcp_send_to_raw_sock(local, skb,
 785                                                   NFC_DIRECTION_TX);
 786
 787                         ret = nfc_data_exchange(local->dev, local->target_idx,
 788                                                 skb, nfc_llcp_recv, local);
 789
 790                         if (ret) {
 791                                 kfree_skb(copy_skb);
 792                                 goto out;
 793                         }
 794
 795                         if (ptype == LLCP_PDU_I && copy_skb)
 796                                 skb_queue_tail(&llcp_sock->tx_pending_queue,
 797                                                copy_skb);
 798                 }
 799         } else {
 800                 nfc_llcp_send_symm(local->dev);
 801         }
 802
 803 out:
 804         mod_timer(&local->link_timer,
 805                   jiffies + msecs_to_jiffies(2 * local->remote_lto));
 806 }
 807
 808 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
 809                                                           u8 ssap)
 810 {
 811         struct sock *sk;
 812         struct nfc_llcp_sock *llcp_sock;
 813
 814         read_lock(&local->connecting_sockets.lock);
 815
 816         sk_for_each(sk, &local->connecting_sockets.head) {
 817                 llcp_sock = nfc_llcp_sock(sk);
 818
 819                 if (llcp_sock->ssap == ssap) {
 820                         sock_hold(&llcp_sock->sk);
 821                         goto out;
 822                 }
 823         }
 824
 825         llcp_sock = NULL;
 826
 827 out:
 828         read_unlock(&local->connecting_sockets.lock);
 829
 830         return llcp_sock;
 831 }
 832
 833 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
 834                                                   const u8 *sn, size_t sn_len)
 835 {
 836         return nfc_llcp_sock_from_sn(local, sn, sn_len, true);
 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                                                           true);
1303                         if (!llcp_sock) {
1304                                 sap = 0;
1305                                 goto add_snl;
1306                         }
1307
1308                         /*
1309                          * We found a socket but its ssap has not been reserved
1310                          * yet. We need to assign it for good and send a reply.
1311                          * The ssap will be freed when the socket is closed.
1312                          */
1313                         if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1314                                 atomic_t *client_count;
1315
1316                                 sap = nfc_llcp_reserve_sdp_ssap(local);
1317
1318                                 pr_debug("Reserving %d\n", sap);
1319
1320                                 if (sap == LLCP_SAP_MAX) {
1321                                         sap = 0;
1322                                         nfc_llcp_sock_put(llcp_sock);
1323                                         goto add_snl;
1324                                 }
1325
1326                                 client_count =
1327                                         &local->local_sdp_cnt[sap -
1328                                                               LLCP_WKS_NUM_SAP];
1329
1330                                 atomic_inc(client_count);
1331
1332                                 llcp_sock->ssap = sap;
1333                                 llcp_sock->reserved_ssap = sap;
1334                         } else {
1335                                 sap = llcp_sock->ssap;
1336                         }
1337
1338                         pr_debug("%p %d\n", llcp_sock, sap);
1339
1340                         nfc_llcp_sock_put(llcp_sock);
1341 add_snl:
1342                         sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1343                         if (sdp == NULL)
1344                                 goto exit;
1345
1346                         sdres_tlvs_len += sdp->tlv_len;
1347                         hlist_add_head(&sdp->node, &llc_sdres_list);
1348                         break;
1349
1350                 case LLCP_TLV_SDRES:
1351                         mutex_lock(&local->sdreq_lock);
1352
1353                         pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1354
1355                         hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1356                                 if (sdp->tid != tlv[2])
1357                                         continue;
1358
1359                                 sdp->sap = tlv[3];
1360
1361                                 pr_debug("Found: uri=%s, sap=%d\n",
1362                                          sdp->uri, sdp->sap);
1363
1364                                 hlist_del(&sdp->node);
1365
1366                                 hlist_add_head(&sdp->node, &nl_sdres_list);
1367
1368                                 break;
1369                         }
1370
1371                         mutex_unlock(&local->sdreq_lock);
1372                         break;
1373
1374                 default:
1375                         pr_err("Invalid SNL tlv value 0x%x\n", type);
1376                         break;
1377                 }
1378
1379                 offset += length + 2;
1380                 tlv += length + 2;
1381         }
1382
1383 exit:
1384         if (!hlist_empty(&nl_sdres_list))
1385                 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1386
1387         if (!hlist_empty(&llc_sdres_list))
1388                 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1389 }
1390
1391 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1392 {
1393         u8 ptype;
1394         u16 pdu_len;
1395         struct sk_buff *new_skb;
1396
1397         if (skb->len <= LLCP_HEADER_SIZE) {
1398                 pr_err("Malformed AGF PDU\n");
1399                 return;
1400         }
1401
1402         skb_pull(skb, LLCP_HEADER_SIZE);
1403
1404         while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1405                 pdu_len = skb->data[0] << 8 | skb->data[1];
1406
1407                 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1408
1409                 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1410                         pr_err("Malformed AGF PDU\n");
1411                         return;
1412                 }
1413
1414                 ptype = nfc_llcp_ptype(skb);
1415
1416                 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1417                         goto next;
1418
1419                 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1420                 if (new_skb == NULL) {
1421                         pr_err("Could not allocate PDU\n");
1422                         return;
1423                 }
1424
1425                 skb_put_data(new_skb, skb->data, pdu_len);
1426
1427                 nfc_llcp_rx_skb(local, new_skb);
1428
1429                 kfree_skb(new_skb);
1430 next:
1431                 skb_pull(skb, pdu_len);
1432         }
1433 }
1434
1435 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1436 {
1437         u8 dsap, ssap, ptype;
1438
1439         ptype = nfc_llcp_ptype(skb);
1440         dsap = nfc_llcp_dsap(skb);
1441         ssap = nfc_llcp_ssap(skb);
1442
1443         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1444
1445         if (ptype != LLCP_PDU_SYMM)
1446                 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1447                                      skb->data, skb->len, true);
1448
1449         switch (ptype) {
1450         case LLCP_PDU_SYMM:
1451                 pr_debug("SYMM\n");
1452                 break;
1453
1454         case LLCP_PDU_UI:
1455                 pr_debug("UI\n");
1456                 nfc_llcp_recv_ui(local, skb);
1457                 break;
1458
1459         case LLCP_PDU_CONNECT:
1460                 pr_debug("CONNECT\n");
1461                 nfc_llcp_recv_connect(local, skb);
1462                 break;
1463
1464         case LLCP_PDU_DISC:
1465                 pr_debug("DISC\n");
1466                 nfc_llcp_recv_disc(local, skb);
1467                 break;
1468
1469         case LLCP_PDU_CC:
1470                 pr_debug("CC\n");
1471                 nfc_llcp_recv_cc(local, skb);
1472                 break;
1473
1474         case LLCP_PDU_DM:
1475                 pr_debug("DM\n");
1476                 nfc_llcp_recv_dm(local, skb);
1477                 break;
1478
1479         case LLCP_PDU_SNL:
1480                 pr_debug("SNL\n");
1481                 nfc_llcp_recv_snl(local, skb);
1482                 break;
1483
1484         case LLCP_PDU_I:
1485         case LLCP_PDU_RR:
1486         case LLCP_PDU_RNR:
1487                 pr_debug("I frame\n");
1488                 nfc_llcp_recv_hdlc(local, skb);
1489                 break;
1490
1491         case LLCP_PDU_AGF:
1492                 pr_debug("AGF frame\n");
1493                 nfc_llcp_recv_agf(local, skb);
1494                 break;
1495         }
1496 }
1497
1498 static void nfc_llcp_rx_work(struct work_struct *work)
1499 {
1500         struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1501                                                     rx_work);
1502         struct sk_buff *skb;
1503
1504         skb = local->rx_pending;
1505         if (skb == NULL) {
1506                 pr_debug("No pending SKB\n");
1507                 return;
1508         }
1509
1510         __net_timestamp(skb);
1511
1512         nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1513
1514         nfc_llcp_rx_skb(local, skb);
1515
1516         schedule_work(&local->tx_work);
1517         kfree_skb(local->rx_pending);
1518         local->rx_pending = NULL;
1519 }
1520
1521 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1522 {
1523         local->rx_pending = skb;
1524         del_timer(&local->link_timer);
1525         schedule_work(&local->rx_work);
1526 }
1527
1528 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1529 {
1530         struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1531
1532         pr_debug("Received an LLCP PDU\n");
1533         if (err < 0) {
1534                 pr_err("err %d\n", err);
1535                 return;
1536         }
1537
1538         __nfc_llcp_recv(local, skb);
1539 }
1540
1541 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1542 {
1543         struct nfc_llcp_local *local;
1544
1545         local = nfc_llcp_find_local(dev);
1546         if (local == NULL) {
1547                 kfree_skb(skb);
1548                 return -ENODEV;
1549         }
1550
1551         __nfc_llcp_recv(local, skb);
1552
1553         nfc_llcp_local_put(local);
1554
1555         return 0;
1556 }
1557
1558 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1559 {
1560         struct nfc_llcp_local *local;
1561
1562         local = nfc_llcp_find_local(dev);
1563         if (local == NULL)
1564                 return;
1565
1566         local->remote_miu = LLCP_DEFAULT_MIU;
1567         local->remote_lto = LLCP_DEFAULT_LTO;
1568
1569         /* Close and purge all existing sockets */
1570         nfc_llcp_socket_release(local, true, 0);
1571
1572         nfc_llcp_local_put(local);
1573 }
1574
1575 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1576                         u8 comm_mode, u8 rf_mode)
1577 {
1578         struct nfc_llcp_local *local;
1579
1580         pr_debug("rf mode %d\n", rf_mode);
1581
1582         local = nfc_llcp_find_local(dev);
1583         if (local == NULL)
1584                 return;
1585
1586         local->target_idx = target_idx;
1587         local->comm_mode = comm_mode;
1588         local->rf_mode = rf_mode;
1589
1590         if (rf_mode == NFC_RF_INITIATOR) {
1591                 pr_debug("Queueing Tx work\n");
1592
1593                 schedule_work(&local->tx_work);
1594         } else {
1595                 mod_timer(&local->link_timer,
1596                           jiffies + msecs_to_jiffies(local->remote_lto));
1597         }
1598
1599         nfc_llcp_local_put(local);
1600 }
1601
1602 int nfc_llcp_register_device(struct nfc_dev *ndev)
1603 {
1604         struct nfc_llcp_local *local;
1605
1606         local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1607         if (local == NULL)
1608                 return -ENOMEM;
1609
1610         local->dev = ndev;
1611         INIT_LIST_HEAD(&local->list);
1612         kref_init(&local->ref);
1613         mutex_init(&local->sdp_lock);
1614         timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1615
1616         skb_queue_head_init(&local->tx_queue);
1617         INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1618
1619         local->rx_pending = NULL;
1620         INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1621
1622         INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1623
1624         rwlock_init(&local->sockets.lock);
1625         rwlock_init(&local->connecting_sockets.lock);
1626         rwlock_init(&local->raw_sockets.lock);
1627
1628         local->lto = 150; /* 1500 ms */
1629         local->rw = LLCP_MAX_RW;
1630         local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1631         local->local_wks = 0x1; /* LLC Link Management */
1632
1633         nfc_llcp_build_gb(local);
1634
1635         local->remote_miu = LLCP_DEFAULT_MIU;
1636         local->remote_lto = LLCP_DEFAULT_LTO;
1637
1638         mutex_init(&local->sdreq_lock);
1639         INIT_HLIST_HEAD(&local->pending_sdreqs);
1640         timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1641         INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1642
1643         spin_lock(&llcp_devices_lock);
1644         list_add(&local->list, &llcp_devices);
1645         spin_unlock(&llcp_devices_lock);
1646
1647         return 0;
1648 }
1649
1650 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1651 {
1652         struct nfc_llcp_local *local = nfc_llcp_remove_local(dev);
1653
1654         if (local == NULL) {
1655                 pr_debug("No such device\n");
1656                 return;
1657         }
1658
1659         local_cleanup(local);
1660
1661         nfc_llcp_local_put(local);
1662 }
1663
1664 int __init nfc_llcp_init(void)
1665 {
1666         return nfc_llcp_sock_init();
1667 }
1668
1669 void nfc_llcp_exit(void)
1670 {
1671         nfc_llcp_sock_exit();
1672 }