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