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