net/nfc/llcp/sock.c

   1 /*
   2  * Copyright (C) 2011  Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the
  16  * Free Software Foundation, Inc.,
  17  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
  21
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/nfc.h>
  26
  27 #include "../nfc.h"
  28 #include "llcp.h"
  29
  30 static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
  31 {
  32         DECLARE_WAITQUEUE(wait, current);
  33         int err = 0;
  34
  35         pr_debug("sk %p", sk);
  36
  37         add_wait_queue(sk_sleep(sk), &wait);
  38         set_current_state(TASK_INTERRUPTIBLE);
  39
  40         while (sk->sk_state != state) {
  41                 if (!timeo) {
  42                         err = -EINPROGRESS;
  43                         break;
  44                 }
  45
  46                 if (signal_pending(current)) {
  47                         err = sock_intr_errno(timeo);
  48                         break;
  49                 }
  50
  51                 release_sock(sk);
  52                 timeo = schedule_timeout(timeo);
  53                 lock_sock(sk);
  54                 set_current_state(TASK_INTERRUPTIBLE);
  55
  56                 err = sock_error(sk);
  57                 if (err)
  58                         break;
  59         }
  60
  61         __set_current_state(TASK_RUNNING);
  62         remove_wait_queue(sk_sleep(sk), &wait);
  63         return err;
  64 }
  65
  66 static struct proto llcp_sock_proto = {
  67         .name     = "NFC_LLCP",
  68         .owner    = THIS_MODULE,
  69         .obj_size = sizeof(struct nfc_llcp_sock),
  70 };
  71
  72 static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
  73 {
  74         struct sock *sk = sock->sk;
  75         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  76         struct nfc_llcp_local *local;
  77         struct nfc_dev *dev;
  78         struct sockaddr_nfc_llcp llcp_addr;
  79         int len, ret = 0;
  80
  81         pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
  82
  83         if (!addr || addr->sa_family != AF_NFC)
  84                 return -EINVAL;
  85
  86         memset(&llcp_addr, 0, sizeof(llcp_addr));
  87         len = min_t(unsigned int, sizeof(llcp_addr), alen);
  88         memcpy(&llcp_addr, addr, len);
  89
  90         /* This is going to be a listening socket, dsap must be 0 */
  91         if (llcp_addr.dsap != 0)
  92                 return -EINVAL;
  93
  94         lock_sock(sk);
  95
  96         if (sk->sk_state != LLCP_CLOSED) {
  97                 ret = -EBADFD;
  98                 goto error;
  99         }
 100
 101         dev = nfc_get_device(llcp_addr.dev_idx);
 102         if (dev == NULL) {
 103                 ret = -ENODEV;
 104                 goto error;
 105         }
 106
 107         local = nfc_llcp_find_local(dev);
 108         if (local == NULL) {
 109                 ret = -ENODEV;
 110                 goto put_dev;
 111         }
 112
 113         llcp_sock->dev = dev;
 114         llcp_sock->local = nfc_llcp_local_get(local);
 115         llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
 116         llcp_sock->service_name_len = min_t(unsigned int,
 117                                             llcp_addr.service_name_len,
 118                                             NFC_LLCP_MAX_SERVICE_NAME);
 119         llcp_sock->service_name = kmemdup(llcp_addr.service_name,
 120                                           llcp_sock->service_name_len,
 121                                           GFP_KERNEL);
 122
 123         llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
 124         if (llcp_sock->ssap == LLCP_MAX_SAP)
 125                 goto put_dev;
 126
 127         local->sockets[llcp_sock->ssap] = llcp_sock;
 128
 129         pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
 130
 131         sk->sk_state = LLCP_BOUND;
 132
 133 put_dev:
 134         nfc_put_device(dev);
 135
 136 error:
 137         release_sock(sk);
 138         return ret;
 139 }
 140
 141 static int llcp_sock_listen(struct socket *sock, int backlog)
 142 {
 143         struct sock *sk = sock->sk;
 144         int ret = 0;
 145
 146         pr_debug("sk %p backlog %d\n", sk, backlog);
 147
 148         lock_sock(sk);
 149
 150         if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
 151             || sk->sk_state != LLCP_BOUND) {
 152                 ret = -EBADFD;
 153                 goto error;
 154         }
 155
 156         sk->sk_max_ack_backlog = backlog;
 157         sk->sk_ack_backlog = 0;
 158
 159         pr_debug("Socket listening\n");
 160         sk->sk_state = LLCP_LISTEN;
 161
 162 error:
 163         release_sock(sk);
 164
 165         return ret;
 166 }
 167
 168 void nfc_llcp_accept_unlink(struct sock *sk)
 169 {
 170         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 171
 172         pr_debug("state %d\n", sk->sk_state);
 173
 174         list_del_init(&llcp_sock->accept_queue);
 175         sk_acceptq_removed(llcp_sock->parent);
 176         llcp_sock->parent = NULL;
 177
 178         sock_put(sk);
 179 }
 180
 181 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
 182 {
 183         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 184         struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
 185
 186         /* Lock will be free from unlink */
 187         sock_hold(sk);
 188
 189         list_add_tail(&llcp_sock->accept_queue,
 190                       &llcp_sock_parent->accept_queue);
 191         llcp_sock->parent = parent;
 192         sk_acceptq_added(parent);
 193 }
 194
 195 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
 196                                      struct socket *newsock)
 197 {
 198         struct nfc_llcp_sock *lsk, *n, *llcp_parent;
 199         struct sock *sk;
 200
 201         llcp_parent = nfc_llcp_sock(parent);
 202
 203         list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
 204                                  accept_queue) {
 205                 sk = &lsk->sk;
 206                 lock_sock(sk);
 207
 208                 if (sk->sk_state == LLCP_CLOSED) {
 209                         release_sock(sk);
 210                         nfc_llcp_accept_unlink(sk);
 211                         continue;
 212                 }
 213
 214                 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
 215                         nfc_llcp_accept_unlink(sk);
 216                         if (newsock)
 217                                 sock_graft(sk, newsock);
 218
 219                         release_sock(sk);
 220
 221                         pr_debug("Returning sk state %d\n", sk->sk_state);
 222
 223                         return sk;
 224                 }
 225
 226                 release_sock(sk);
 227         }
 228
 229         return NULL;
 230 }
 231
 232 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
 233                             int flags)
 234 {
 235         DECLARE_WAITQUEUE(wait, current);
 236         struct sock *sk = sock->sk, *new_sk;
 237         long timeo;
 238         int ret = 0;
 239
 240         pr_debug("parent %p\n", sk);
 241
 242         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 243
 244         if (sk->sk_state != LLCP_LISTEN) {
 245                 ret = -EBADFD;
 246                 goto error;
 247         }
 248
 249         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 250
 251         /* Wait for an incoming connection. */
 252         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 253         while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
 254                 set_current_state(TASK_INTERRUPTIBLE);
 255
 256                 if (!timeo) {
 257                         ret = -EAGAIN;
 258                         break;
 259                 }
 260
 261                 if (signal_pending(current)) {
 262                         ret = sock_intr_errno(timeo);
 263                         break;
 264                 }
 265
 266                 release_sock(sk);
 267                 timeo = schedule_timeout(timeo);
 268                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 269         }
 270         __set_current_state(TASK_RUNNING);
 271         remove_wait_queue(sk_sleep(sk), &wait);
 272
 273         if (ret)
 274                 goto error;
 275
 276         newsock->state = SS_CONNECTED;
 277
 278         pr_debug("new socket %p\n", new_sk);
 279
 280 error:
 281         release_sock(sk);
 282
 283         return ret;
 284 }
 285
 286 static int llcp_sock_getname(struct socket *sock, struct sockaddr *addr,
 287                              int *len, int peer)
 288 {
 289         struct sockaddr_nfc_llcp *llcp_addr = (struct sockaddr_nfc_llcp *)addr;
 290         struct sock *sk = sock->sk;
 291         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 292
 293         pr_debug("%p\n", sk);
 294
 295         addr->sa_family = AF_NFC;
 296         *len = sizeof(struct sockaddr_nfc_llcp);
 297
 298         llcp_addr->dev_idx = llcp_sock->dev->idx;
 299         llcp_addr->dsap = llcp_sock->dsap;
 300         llcp_addr->ssap = llcp_sock->ssap;
 301         llcp_addr->service_name_len = llcp_sock->service_name_len;
 302         memcpy(llcp_addr->service_name, llcp_sock->service_name,
 303                llcp_addr->service_name_len);
 304
 305         return 0;
 306 }
 307
 308 static inline unsigned int llcp_accept_poll(struct sock *parent)
 309 {
 310         struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
 311         struct sock *sk;
 312
 313         parent_sock = nfc_llcp_sock(parent);
 314
 315         list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
 316                                  accept_queue) {
 317                 sk = &llcp_sock->sk;
 318
 319                 if (sk->sk_state == LLCP_CONNECTED)
 320                         return POLLIN | POLLRDNORM;
 321         }
 322
 323         return 0;
 324 }
 325
 326 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
 327                                    poll_table *wait)
 328 {
 329         struct sock *sk = sock->sk;
 330         unsigned int mask = 0;
 331
 332         pr_debug("%p\n", sk);
 333
 334         sock_poll_wait(file, sk_sleep(sk), wait);
 335
 336         if (sk->sk_state == LLCP_LISTEN)
 337                 return llcp_accept_poll(sk);
 338
 339         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
 340                 mask |= POLLERR;
 341
 342         if (!skb_queue_empty(&sk->sk_receive_queue))
 343                 mask |= POLLIN | POLLRDNORM;
 344
 345         if (sk->sk_state == LLCP_CLOSED)
 346                 mask |= POLLHUP;
 347
 348         if (sk->sk_shutdown & RCV_SHUTDOWN)
 349                 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
 350
 351         if (sk->sk_shutdown == SHUTDOWN_MASK)
 352                 mask |= POLLHUP;
 353
 354         if (sock_writeable(sk))
 355                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
 356         else
 357                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 358
 359         pr_debug("mask 0x%x\n", mask);
 360
 361         return mask;
 362 }
 363
 364 static int llcp_sock_release(struct socket *sock)
 365 {
 366         struct sock *sk = sock->sk;
 367         struct nfc_llcp_local *local;
 368         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 369         int err = 0;
 370
 371         if (!sk)
 372                 return 0;
 373
 374         pr_debug("%p\n", sk);
 375
 376         local = llcp_sock->local;
 377         if (local == NULL) {
 378                 err = -ENODEV;
 379                 goto out;
 380         }
 381
 382         mutex_lock(&local->socket_lock);
 383
 384         if (llcp_sock == local->sockets[llcp_sock->ssap])
 385                 local->sockets[llcp_sock->ssap] = NULL;
 386         else
 387                 list_del_init(&llcp_sock->list);
 388
 389         mutex_unlock(&local->socket_lock);
 390
 391         lock_sock(sk);
 392
 393         /* Send a DISC */
 394         if (sk->sk_state == LLCP_CONNECTED)
 395                 nfc_llcp_disconnect(llcp_sock);
 396
 397         if (sk->sk_state == LLCP_LISTEN) {
 398                 struct nfc_llcp_sock *lsk, *n;
 399                 struct sock *accept_sk;
 400
 401                 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
 402                                          accept_queue) {
 403                         accept_sk = &lsk->sk;
 404                         lock_sock(accept_sk);
 405
 406                         nfc_llcp_disconnect(lsk);
 407                         nfc_llcp_accept_unlink(accept_sk);
 408
 409                         release_sock(accept_sk);
 410
 411                         sock_orphan(accept_sk);
 412                 }
 413         }
 414
 415         /* Freeing the SAP */
 416         if ((sk->sk_state == LLCP_CONNECTED
 417              && llcp_sock->ssap > LLCP_LOCAL_SAP_OFFSET) ||
 418             sk->sk_state == LLCP_BOUND || sk->sk_state == LLCP_LISTEN)
 419                 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
 420
 421         release_sock(sk);
 422
 423 out:
 424         sock_orphan(sk);
 425         sock_put(sk);
 426
 427         return err;
 428 }
 429
 430 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
 431                              int len, int flags)
 432 {
 433         struct sock *sk = sock->sk;
 434         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 435         struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
 436         struct nfc_dev *dev;
 437         struct nfc_llcp_local *local;
 438         int ret = 0;
 439
 440         pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
 441
 442         if (!addr || len < sizeof(struct sockaddr_nfc) ||
 443             addr->sa_family != AF_NFC) {
 444                 pr_err("Invalid socket\n");
 445                 return -EINVAL;
 446         }
 447
 448         if (addr->service_name_len == 0 && addr->dsap == 0) {
 449                 pr_err("Missing service name or dsap\n");
 450                 return -EINVAL;
 451         }
 452
 453         pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
 454                  addr->target_idx, addr->nfc_protocol);
 455
 456         lock_sock(sk);
 457
 458         if (sk->sk_state == LLCP_CONNECTED) {
 459                 ret = -EISCONN;
 460                 goto error;
 461         }
 462
 463         dev = nfc_get_device(addr->dev_idx);
 464         if (dev == NULL) {
 465                 ret = -ENODEV;
 466                 goto error;
 467         }
 468
 469         local = nfc_llcp_find_local(dev);
 470         if (local == NULL) {
 471                 ret = -ENODEV;
 472                 goto put_dev;
 473         }
 474
 475         device_lock(&dev->dev);
 476         if (dev->dep_link_up == false) {
 477                 ret = -ENOLINK;
 478                 device_unlock(&dev->dev);
 479                 goto put_dev;
 480         }
 481         device_unlock(&dev->dev);
 482
 483         if (local->rf_mode == NFC_RF_INITIATOR &&
 484             addr->target_idx != local->target_idx) {
 485                 ret = -ENOLINK;
 486                 goto put_dev;
 487         }
 488
 489         llcp_sock->dev = dev;
 490         llcp_sock->local = nfc_llcp_local_get(local);
 491         llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
 492         if (llcp_sock->ssap == LLCP_SAP_MAX) {
 493                 ret = -ENOMEM;
 494                 goto put_dev;
 495         }
 496         if (addr->service_name_len == 0)
 497                 llcp_sock->dsap = addr->dsap;
 498         else
 499                 llcp_sock->dsap = LLCP_SAP_SDP;
 500         llcp_sock->nfc_protocol = addr->nfc_protocol;
 501         llcp_sock->service_name_len = min_t(unsigned int,
 502                                             addr->service_name_len,
 503                                             NFC_LLCP_MAX_SERVICE_NAME);
 504         llcp_sock->service_name = kmemdup(addr->service_name,
 505                                           llcp_sock->service_name_len,
 506                                           GFP_KERNEL);
 507
 508         local->sockets[llcp_sock->ssap] = llcp_sock;
 509
 510         ret = nfc_llcp_send_connect(llcp_sock);
 511         if (ret)
 512                 goto put_dev;
 513
 514         ret = sock_wait_state(sk, LLCP_CONNECTED,
 515                               sock_sndtimeo(sk, flags & O_NONBLOCK));
 516         if (ret)
 517                 goto put_dev;
 518
 519         release_sock(sk);
 520
 521         return 0;
 522
 523 put_dev:
 524         nfc_put_device(dev);
 525
 526 error:
 527         release_sock(sk);
 528         return ret;
 529 }
 530
 531 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 532                              struct msghdr *msg, size_t len)
 533 {
 534         struct sock *sk = sock->sk;
 535         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 536         int ret;
 537
 538         pr_debug("sock %p sk %p", sock, sk);
 539
 540         ret = sock_error(sk);
 541         if (ret)
 542                 return ret;
 543
 544         if (msg->msg_flags & MSG_OOB)
 545                 return -EOPNOTSUPP;
 546
 547         lock_sock(sk);
 548
 549         if (sk->sk_state != LLCP_CONNECTED) {
 550                 release_sock(sk);
 551                 return -ENOTCONN;
 552         }
 553
 554         release_sock(sk);
 555
 556         return nfc_llcp_send_i_frame(llcp_sock, msg, len);
 557 }
 558
 559 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 560                              struct msghdr *msg, size_t len, int flags)
 561 {
 562         int noblock = flags & MSG_DONTWAIT;
 563         struct sock *sk = sock->sk;
 564         unsigned int copied, rlen;
 565         struct sk_buff *skb, *cskb;
 566         int err = 0;
 567
 568         pr_debug("%p %zu\n", sk, len);
 569
 570         lock_sock(sk);
 571
 572         if (sk->sk_state == LLCP_CLOSED &&
 573             skb_queue_empty(&sk->sk_receive_queue)) {
 574                 release_sock(sk);
 575                 return 0;
 576         }
 577
 578         release_sock(sk);
 579
 580         if (flags & (MSG_OOB))
 581                 return -EOPNOTSUPP;
 582
 583         skb = skb_recv_datagram(sk, flags, noblock, &err);
 584         if (!skb) {
 585                 pr_err("Recv datagram failed state %d %d %d",
 586                        sk->sk_state, err, sock_error(sk));
 587
 588                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 589                         return 0;
 590
 591                 return err;
 592         }
 593
 594         rlen = skb->len;                /* real length of skb */
 595         copied = min_t(unsigned int, rlen, len);
 596
 597         cskb = skb;
 598         if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
 599                 if (!(flags & MSG_PEEK))
 600                         skb_queue_head(&sk->sk_receive_queue, skb);
 601                 return -EFAULT;
 602         }
 603
 604         /* Mark read part of skb as used */
 605         if (!(flags & MSG_PEEK)) {
 606
 607                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
 608                 if (sk->sk_type == SOCK_STREAM) {
 609                         skb_pull(skb, copied);
 610                         if (skb->len) {
 611                                 skb_queue_head(&sk->sk_receive_queue, skb);
 612                                 goto done;
 613                         }
 614                 }
 615
 616                 kfree_skb(skb);
 617         }
 618
 619         /* XXX Queue backlogged skbs */
 620
 621 done:
 622         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
 623         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
 624                 copied = rlen;
 625
 626         return copied;
 627 }
 628
 629 static const struct proto_ops llcp_sock_ops = {
 630         .family         = PF_NFC,
 631         .owner          = THIS_MODULE,
 632         .bind           = llcp_sock_bind,
 633         .connect        = llcp_sock_connect,
 634         .release        = llcp_sock_release,
 635         .socketpair     = sock_no_socketpair,
 636         .accept         = llcp_sock_accept,
 637         .getname        = llcp_sock_getname,
 638         .poll           = llcp_sock_poll,
 639         .ioctl          = sock_no_ioctl,
 640         .listen         = llcp_sock_listen,
 641         .shutdown       = sock_no_shutdown,
 642         .setsockopt     = sock_no_setsockopt,
 643         .getsockopt     = sock_no_getsockopt,
 644         .sendmsg        = llcp_sock_sendmsg,
 645         .recvmsg        = llcp_sock_recvmsg,
 646         .mmap           = sock_no_mmap,
 647 };
 648
 649 static void llcp_sock_destruct(struct sock *sk)
 650 {
 651         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 652
 653         pr_debug("%p\n", sk);
 654
 655         if (sk->sk_state == LLCP_CONNECTED)
 656                 nfc_put_device(llcp_sock->dev);
 657
 658         skb_queue_purge(&sk->sk_receive_queue);
 659
 660         nfc_llcp_sock_free(llcp_sock);
 661
 662         if (!sock_flag(sk, SOCK_DEAD)) {
 663                 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
 664                 return;
 665         }
 666 }
 667
 668 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
 669 {
 670         struct sock *sk;
 671         struct nfc_llcp_sock *llcp_sock;
 672
 673         sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
 674         if (!sk)
 675                 return NULL;
 676
 677         llcp_sock = nfc_llcp_sock(sk);
 678
 679         sock_init_data(sock, sk);
 680         sk->sk_state = LLCP_CLOSED;
 681         sk->sk_protocol = NFC_SOCKPROTO_LLCP;
 682         sk->sk_type = type;
 683         sk->sk_destruct = llcp_sock_destruct;
 684
 685         llcp_sock->ssap = 0;
 686         llcp_sock->dsap = LLCP_SAP_SDP;
 687         llcp_sock->send_n = llcp_sock->send_ack_n = 0;
 688         llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
 689         llcp_sock->remote_ready = 1;
 690         skb_queue_head_init(&llcp_sock->tx_queue);
 691         skb_queue_head_init(&llcp_sock->tx_pending_queue);
 692         skb_queue_head_init(&llcp_sock->tx_backlog_queue);
 693         INIT_LIST_HEAD(&llcp_sock->list);
 694         INIT_LIST_HEAD(&llcp_sock->accept_queue);
 695
 696         if (sock != NULL)
 697                 sock->state = SS_UNCONNECTED;
 698
 699         return sk;
 700 }
 701
 702 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
 703 {
 704         kfree(sock->service_name);
 705
 706         skb_queue_purge(&sock->tx_queue);
 707         skb_queue_purge(&sock->tx_pending_queue);
 708         skb_queue_purge(&sock->tx_backlog_queue);
 709
 710         list_del_init(&sock->accept_queue);
 711         list_del_init(&sock->list);
 712
 713         sock->parent = NULL;
 714
 715         nfc_llcp_local_put(sock->local);
 716 }
 717
 718 static int llcp_sock_create(struct net *net, struct socket *sock,
 719                             const struct nfc_protocol *nfc_proto)
 720 {
 721         struct sock *sk;
 722
 723         pr_debug("%p\n", sock);
 724
 725         if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
 726                 return -ESOCKTNOSUPPORT;
 727
 728         sock->ops = &llcp_sock_ops;
 729
 730         sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
 731         if (sk == NULL)
 732                 return -ENOMEM;
 733
 734         return 0;
 735 }
 736
 737 static const struct nfc_protocol llcp_nfc_proto = {
 738         .id       = NFC_SOCKPROTO_LLCP,
 739         .proto    = &llcp_sock_proto,
 740         .owner    = THIS_MODULE,
 741         .create   = llcp_sock_create
 742 };
 743
 744 int __init nfc_llcp_sock_init(void)
 745 {
 746         return nfc_proto_register(&llcp_nfc_proto);
 747 }
 748
 749 void nfc_llcp_sock_exit(void)
 750 {
 751         nfc_proto_unregister(&llcp_nfc_proto);
 752 }