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         nfc_llcp_sock_link(&local->sockets, sk);
 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         lock_sock(sk);
 383
 384         /* Send a DISC */
 385         if (sk->sk_state == LLCP_CONNECTED)
 386                 nfc_llcp_disconnect(llcp_sock);
 387
 388         if (sk->sk_state == LLCP_LISTEN) {
 389                 struct nfc_llcp_sock *lsk, *n;
 390                 struct sock *accept_sk;
 391
 392                 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
 393                                          accept_queue) {
 394                         accept_sk = &lsk->sk;
 395                         lock_sock(accept_sk);
 396
 397                         nfc_llcp_disconnect(lsk);
 398                         nfc_llcp_accept_unlink(accept_sk);
 399
 400                         release_sock(accept_sk);
 401
 402                         sock_orphan(accept_sk);
 403                 }
 404         }
 405
 406         nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
 407
 408         release_sock(sk);
 409
 410         nfc_llcp_sock_unlink(&local->sockets, sk);
 411
 412 out:
 413         sock_orphan(sk);
 414         sock_put(sk);
 415
 416         return err;
 417 }
 418
 419 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
 420                              int len, int flags)
 421 {
 422         struct sock *sk = sock->sk;
 423         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 424         struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
 425         struct nfc_dev *dev;
 426         struct nfc_llcp_local *local;
 427         int ret = 0;
 428
 429         pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
 430
 431         if (!addr || len < sizeof(struct sockaddr_nfc) ||
 432             addr->sa_family != AF_NFC) {
 433                 pr_err("Invalid socket\n");
 434                 return -EINVAL;
 435         }
 436
 437         if (addr->service_name_len == 0 && addr->dsap == 0) {
 438                 pr_err("Missing service name or dsap\n");
 439                 return -EINVAL;
 440         }
 441
 442         pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
 443                  addr->target_idx, addr->nfc_protocol);
 444
 445         lock_sock(sk);
 446
 447         if (sk->sk_state == LLCP_CONNECTED) {
 448                 ret = -EISCONN;
 449                 goto error;
 450         }
 451
 452         dev = nfc_get_device(addr->dev_idx);
 453         if (dev == NULL) {
 454                 ret = -ENODEV;
 455                 goto error;
 456         }
 457
 458         local = nfc_llcp_find_local(dev);
 459         if (local == NULL) {
 460                 ret = -ENODEV;
 461                 goto put_dev;
 462         }
 463
 464         device_lock(&dev->dev);
 465         if (dev->dep_link_up == false) {
 466                 ret = -ENOLINK;
 467                 device_unlock(&dev->dev);
 468                 goto put_dev;
 469         }
 470         device_unlock(&dev->dev);
 471
 472         if (local->rf_mode == NFC_RF_INITIATOR &&
 473             addr->target_idx != local->target_idx) {
 474                 ret = -ENOLINK;
 475                 goto put_dev;
 476         }
 477
 478         llcp_sock->dev = dev;
 479         llcp_sock->local = nfc_llcp_local_get(local);
 480         llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
 481         if (llcp_sock->ssap == LLCP_SAP_MAX) {
 482                 ret = -ENOMEM;
 483                 goto put_dev;
 484         }
 485         if (addr->service_name_len == 0)
 486                 llcp_sock->dsap = addr->dsap;
 487         else
 488                 llcp_sock->dsap = LLCP_SAP_SDP;
 489         llcp_sock->nfc_protocol = addr->nfc_protocol;
 490         llcp_sock->service_name_len = min_t(unsigned int,
 491                                             addr->service_name_len,
 492                                             NFC_LLCP_MAX_SERVICE_NAME);
 493         llcp_sock->service_name = kmemdup(addr->service_name,
 494                                           llcp_sock->service_name_len,
 495                                           GFP_KERNEL);
 496
 497         nfc_llcp_sock_link(&local->connecting_sockets, sk);
 498
 499         ret = nfc_llcp_send_connect(llcp_sock);
 500         if (ret)
 501                 goto sock_unlink;
 502
 503         ret = sock_wait_state(sk, LLCP_CONNECTED,
 504                               sock_sndtimeo(sk, flags & O_NONBLOCK));
 505         if (ret)
 506                 goto sock_unlink;
 507
 508         release_sock(sk);
 509
 510         return 0;
 511
 512 sock_unlink:
 513         nfc_llcp_put_ssap(local, llcp_sock->ssap);
 514
 515         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
 516
 517 put_dev:
 518         nfc_put_device(dev);
 519
 520 error:
 521         release_sock(sk);
 522         return ret;
 523 }
 524
 525 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 526                              struct msghdr *msg, size_t len)
 527 {
 528         struct sock *sk = sock->sk;
 529         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 530         int ret;
 531
 532         pr_debug("sock %p sk %p", sock, sk);
 533
 534         ret = sock_error(sk);
 535         if (ret)
 536                 return ret;
 537
 538         if (msg->msg_flags & MSG_OOB)
 539                 return -EOPNOTSUPP;
 540
 541         lock_sock(sk);
 542
 543         if (sk->sk_state != LLCP_CONNECTED) {
 544                 release_sock(sk);
 545                 return -ENOTCONN;
 546         }
 547
 548         release_sock(sk);
 549
 550         return nfc_llcp_send_i_frame(llcp_sock, msg, len);
 551 }
 552
 553 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 554                              struct msghdr *msg, size_t len, int flags)
 555 {
 556         int noblock = flags & MSG_DONTWAIT;
 557         struct sock *sk = sock->sk;
 558         unsigned int copied, rlen;
 559         struct sk_buff *skb, *cskb;
 560         int err = 0;
 561
 562         pr_debug("%p %zu\n", sk, len);
 563
 564         lock_sock(sk);
 565
 566         if (sk->sk_state == LLCP_CLOSED &&
 567             skb_queue_empty(&sk->sk_receive_queue)) {
 568                 release_sock(sk);
 569                 return 0;
 570         }
 571
 572         release_sock(sk);
 573
 574         if (flags & (MSG_OOB))
 575                 return -EOPNOTSUPP;
 576
 577         skb = skb_recv_datagram(sk, flags, noblock, &err);
 578         if (!skb) {
 579                 pr_err("Recv datagram failed state %d %d %d",
 580                        sk->sk_state, err, sock_error(sk));
 581
 582                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 583                         return 0;
 584
 585                 return err;
 586         }
 587
 588         rlen = skb->len;                /* real length of skb */
 589         copied = min_t(unsigned int, rlen, len);
 590
 591         cskb = skb;
 592         if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
 593                 if (!(flags & MSG_PEEK))
 594                         skb_queue_head(&sk->sk_receive_queue, skb);
 595                 return -EFAULT;
 596         }
 597
 598         /* Mark read part of skb as used */
 599         if (!(flags & MSG_PEEK)) {
 600
 601                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
 602                 if (sk->sk_type == SOCK_STREAM) {
 603                         skb_pull(skb, copied);
 604                         if (skb->len) {
 605                                 skb_queue_head(&sk->sk_receive_queue, skb);
 606                                 goto done;
 607                         }
 608                 }
 609
 610                 kfree_skb(skb);
 611         }
 612
 613         /* XXX Queue backlogged skbs */
 614
 615 done:
 616         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
 617         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
 618                 copied = rlen;
 619
 620         return copied;
 621 }
 622
 623 static const struct proto_ops llcp_sock_ops = {
 624         .family         = PF_NFC,
 625         .owner          = THIS_MODULE,
 626         .bind           = llcp_sock_bind,
 627         .connect        = llcp_sock_connect,
 628         .release        = llcp_sock_release,
 629         .socketpair     = sock_no_socketpair,
 630         .accept         = llcp_sock_accept,
 631         .getname        = llcp_sock_getname,
 632         .poll           = llcp_sock_poll,
 633         .ioctl          = sock_no_ioctl,
 634         .listen         = llcp_sock_listen,
 635         .shutdown       = sock_no_shutdown,
 636         .setsockopt     = sock_no_setsockopt,
 637         .getsockopt     = sock_no_getsockopt,
 638         .sendmsg        = llcp_sock_sendmsg,
 639         .recvmsg        = llcp_sock_recvmsg,
 640         .mmap           = sock_no_mmap,
 641 };
 642
 643 static void llcp_sock_destruct(struct sock *sk)
 644 {
 645         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 646
 647         pr_debug("%p\n", sk);
 648
 649         if (sk->sk_state == LLCP_CONNECTED)
 650                 nfc_put_device(llcp_sock->dev);
 651
 652         skb_queue_purge(&sk->sk_receive_queue);
 653
 654         nfc_llcp_sock_free(llcp_sock);
 655
 656         if (!sock_flag(sk, SOCK_DEAD)) {
 657                 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
 658                 return;
 659         }
 660 }
 661
 662 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
 663 {
 664         struct sock *sk;
 665         struct nfc_llcp_sock *llcp_sock;
 666
 667         sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
 668         if (!sk)
 669                 return NULL;
 670
 671         llcp_sock = nfc_llcp_sock(sk);
 672
 673         sock_init_data(sock, sk);
 674         sk->sk_state = LLCP_CLOSED;
 675         sk->sk_protocol = NFC_SOCKPROTO_LLCP;
 676         sk->sk_type = type;
 677         sk->sk_destruct = llcp_sock_destruct;
 678
 679         llcp_sock->ssap = 0;
 680         llcp_sock->dsap = LLCP_SAP_SDP;
 681         llcp_sock->send_n = llcp_sock->send_ack_n = 0;
 682         llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
 683         llcp_sock->remote_ready = 1;
 684         skb_queue_head_init(&llcp_sock->tx_queue);
 685         skb_queue_head_init(&llcp_sock->tx_pending_queue);
 686         skb_queue_head_init(&llcp_sock->tx_backlog_queue);
 687         INIT_LIST_HEAD(&llcp_sock->accept_queue);
 688
 689         if (sock != NULL)
 690                 sock->state = SS_UNCONNECTED;
 691
 692         return sk;
 693 }
 694
 695 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
 696 {
 697         kfree(sock->service_name);
 698
 699         skb_queue_purge(&sock->tx_queue);
 700         skb_queue_purge(&sock->tx_pending_queue);
 701         skb_queue_purge(&sock->tx_backlog_queue);
 702
 703         list_del_init(&sock->accept_queue);
 704
 705         sock->parent = NULL;
 706
 707         nfc_llcp_local_put(sock->local);
 708 }
 709
 710 static int llcp_sock_create(struct net *net, struct socket *sock,
 711                             const struct nfc_protocol *nfc_proto)
 712 {
 713         struct sock *sk;
 714
 715         pr_debug("%p\n", sock);
 716
 717         if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
 718                 return -ESOCKTNOSUPPORT;
 719
 720         sock->ops = &llcp_sock_ops;
 721
 722         sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
 723         if (sk == NULL)
 724                 return -ENOMEM;
 725
 726         return 0;
 727 }
 728
 729 static const struct nfc_protocol llcp_nfc_proto = {
 730         .id       = NFC_SOCKPROTO_LLCP,
 731         .proto    = &llcp_sock_proto,
 732         .owner    = THIS_MODULE,
 733         .create   = llcp_sock_create
 734 };
 735
 736 int __init nfc_llcp_sock_init(void)
 737 {
 738         return nfc_proto_register(&llcp_nfc_proto);
 739 }
 740
 741 void nfc_llcp_sock_exit(void)
 742 {
 743         nfc_proto_unregister(&llcp_nfc_proto);
 744 }