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         if (llcp_sock == NULL)
 296                 return -EBADFD;
 297
 298         addr->sa_family = AF_NFC;
 299         *len = sizeof(struct sockaddr_nfc_llcp);
 300
 301         llcp_addr->dev_idx = llcp_sock->dev->idx;
 302         llcp_addr->dsap = llcp_sock->dsap;
 303         llcp_addr->ssap = llcp_sock->ssap;
 304         llcp_addr->service_name_len = llcp_sock->service_name_len;
 305         memcpy(llcp_addr->service_name, llcp_sock->service_name,
 306                llcp_addr->service_name_len);
 307
 308         return 0;
 309 }
 310
 311 static inline unsigned int llcp_accept_poll(struct sock *parent)
 312 {
 313         struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
 314         struct sock *sk;
 315
 316         parent_sock = nfc_llcp_sock(parent);
 317
 318         list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
 319                                  accept_queue) {
 320                 sk = &llcp_sock->sk;
 321
 322                 if (sk->sk_state == LLCP_CONNECTED)
 323                         return POLLIN | POLLRDNORM;
 324         }
 325
 326         return 0;
 327 }
 328
 329 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
 330                                    poll_table *wait)
 331 {
 332         struct sock *sk = sock->sk;
 333         unsigned int mask = 0;
 334
 335         pr_debug("%p\n", sk);
 336
 337         sock_poll_wait(file, sk_sleep(sk), wait);
 338
 339         if (sk->sk_state == LLCP_LISTEN)
 340                 return llcp_accept_poll(sk);
 341
 342         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
 343                 mask |= POLLERR;
 344
 345         if (!skb_queue_empty(&sk->sk_receive_queue))
 346                 mask |= POLLIN | POLLRDNORM;
 347
 348         if (sk->sk_state == LLCP_CLOSED)
 349                 mask |= POLLHUP;
 350
 351         if (sk->sk_shutdown & RCV_SHUTDOWN)
 352                 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
 353
 354         if (sk->sk_shutdown == SHUTDOWN_MASK)
 355                 mask |= POLLHUP;
 356
 357         if (sock_writeable(sk))
 358                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
 359         else
 360                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 361
 362         pr_debug("mask 0x%x\n", mask);
 363
 364         return mask;
 365 }
 366
 367 static int llcp_sock_release(struct socket *sock)
 368 {
 369         struct sock *sk = sock->sk;
 370         struct nfc_llcp_local *local;
 371         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 372         int err = 0;
 373
 374         if (!sk)
 375                 return 0;
 376
 377         pr_debug("%p\n", sk);
 378
 379         local = llcp_sock->local;
 380         if (local == NULL) {
 381                 err = -ENODEV;
 382                 goto out;
 383         }
 384
 385         lock_sock(sk);
 386
 387         /* Send a DISC */
 388         if (sk->sk_state == LLCP_CONNECTED)
 389                 nfc_llcp_disconnect(llcp_sock);
 390
 391         if (sk->sk_state == LLCP_LISTEN) {
 392                 struct nfc_llcp_sock *lsk, *n;
 393                 struct sock *accept_sk;
 394
 395                 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
 396                                          accept_queue) {
 397                         accept_sk = &lsk->sk;
 398                         lock_sock(accept_sk);
 399
 400                         nfc_llcp_disconnect(lsk);
 401                         nfc_llcp_accept_unlink(accept_sk);
 402
 403                         release_sock(accept_sk);
 404
 405                         sock_orphan(accept_sk);
 406                 }
 407         }
 408
 409         nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
 410
 411         release_sock(sk);
 412
 413         nfc_llcp_sock_unlink(&local->sockets, sk);
 414
 415 out:
 416         sock_orphan(sk);
 417         sock_put(sk);
 418
 419         return err;
 420 }
 421
 422 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
 423                              int len, int flags)
 424 {
 425         struct sock *sk = sock->sk;
 426         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 427         struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
 428         struct nfc_dev *dev;
 429         struct nfc_llcp_local *local;
 430         int ret = 0;
 431
 432         pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
 433
 434         if (!addr || len < sizeof(struct sockaddr_nfc) ||
 435             addr->sa_family != AF_NFC) {
 436                 pr_err("Invalid socket\n");
 437                 return -EINVAL;
 438         }
 439
 440         if (addr->service_name_len == 0 && addr->dsap == 0) {
 441                 pr_err("Missing service name or dsap\n");
 442                 return -EINVAL;
 443         }
 444
 445         pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
 446                  addr->target_idx, addr->nfc_protocol);
 447
 448         lock_sock(sk);
 449
 450         if (sk->sk_state == LLCP_CONNECTED) {
 451                 ret = -EISCONN;
 452                 goto error;
 453         }
 454
 455         dev = nfc_get_device(addr->dev_idx);
 456         if (dev == NULL) {
 457                 ret = -ENODEV;
 458                 goto error;
 459         }
 460
 461         local = nfc_llcp_find_local(dev);
 462         if (local == NULL) {
 463                 ret = -ENODEV;
 464                 goto put_dev;
 465         }
 466
 467         device_lock(&dev->dev);
 468         if (dev->dep_link_up == false) {
 469                 ret = -ENOLINK;
 470                 device_unlock(&dev->dev);
 471                 goto put_dev;
 472         }
 473         device_unlock(&dev->dev);
 474
 475         if (local->rf_mode == NFC_RF_INITIATOR &&
 476             addr->target_idx != local->target_idx) {
 477                 ret = -ENOLINK;
 478                 goto put_dev;
 479         }
 480
 481         llcp_sock->dev = dev;
 482         llcp_sock->local = nfc_llcp_local_get(local);
 483         llcp_sock->miu = llcp_sock->local->remote_miu;
 484         llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
 485         if (llcp_sock->ssap == LLCP_SAP_MAX) {
 486                 ret = -ENOMEM;
 487                 goto put_dev;
 488         }
 489         if (addr->service_name_len == 0)
 490                 llcp_sock->dsap = addr->dsap;
 491         else
 492                 llcp_sock->dsap = LLCP_SAP_SDP;
 493         llcp_sock->nfc_protocol = addr->nfc_protocol;
 494         llcp_sock->service_name_len = min_t(unsigned int,
 495                                             addr->service_name_len,
 496                                             NFC_LLCP_MAX_SERVICE_NAME);
 497         llcp_sock->service_name = kmemdup(addr->service_name,
 498                                           llcp_sock->service_name_len,
 499                                           GFP_KERNEL);
 500
 501         nfc_llcp_sock_link(&local->connecting_sockets, sk);
 502
 503         ret = nfc_llcp_send_connect(llcp_sock);
 504         if (ret)
 505                 goto sock_unlink;
 506
 507         ret = sock_wait_state(sk, LLCP_CONNECTED,
 508                               sock_sndtimeo(sk, flags & O_NONBLOCK));
 509         if (ret)
 510                 goto sock_unlink;
 511
 512         release_sock(sk);
 513
 514         return 0;
 515
 516 sock_unlink:
 517         nfc_llcp_put_ssap(local, llcp_sock->ssap);
 518
 519         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
 520
 521 put_dev:
 522         nfc_put_device(dev);
 523
 524 error:
 525         release_sock(sk);
 526         return ret;
 527 }
 528
 529 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 530                              struct msghdr *msg, size_t len)
 531 {
 532         struct sock *sk = sock->sk;
 533         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 534         int ret;
 535
 536         pr_debug("sock %p sk %p", sock, sk);
 537
 538         ret = sock_error(sk);
 539         if (ret)
 540                 return ret;
 541
 542         if (msg->msg_flags & MSG_OOB)
 543                 return -EOPNOTSUPP;
 544
 545         lock_sock(sk);
 546
 547         if (sk->sk_state != LLCP_CONNECTED) {
 548                 release_sock(sk);
 549                 return -ENOTCONN;
 550         }
 551
 552         release_sock(sk);
 553
 554         return nfc_llcp_send_i_frame(llcp_sock, msg, len);
 555 }
 556
 557 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 558                              struct msghdr *msg, size_t len, int flags)
 559 {
 560         int noblock = flags & MSG_DONTWAIT;
 561         struct sock *sk = sock->sk;
 562         unsigned int copied, rlen;
 563         struct sk_buff *skb, *cskb;
 564         int err = 0;
 565
 566         pr_debug("%p %zu\n", sk, len);
 567
 568         lock_sock(sk);
 569
 570         if (sk->sk_state == LLCP_CLOSED &&
 571             skb_queue_empty(&sk->sk_receive_queue)) {
 572                 release_sock(sk);
 573                 return 0;
 574         }
 575
 576         release_sock(sk);
 577
 578         if (flags & (MSG_OOB))
 579                 return -EOPNOTSUPP;
 580
 581         skb = skb_recv_datagram(sk, flags, noblock, &err);
 582         if (!skb) {
 583                 pr_err("Recv datagram failed state %d %d %d",
 584                        sk->sk_state, err, sock_error(sk));
 585
 586                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 587                         return 0;
 588
 589                 return err;
 590         }
 591
 592         rlen = skb->len;                /* real length of skb */
 593         copied = min_t(unsigned int, rlen, len);
 594
 595         cskb = skb;
 596         if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
 597                 if (!(flags & MSG_PEEK))
 598                         skb_queue_head(&sk->sk_receive_queue, skb);
 599                 return -EFAULT;
 600         }
 601
 602         /* Mark read part of skb as used */
 603         if (!(flags & MSG_PEEK)) {
 604
 605                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
 606                 if (sk->sk_type == SOCK_STREAM) {
 607                         skb_pull(skb, copied);
 608                         if (skb->len) {
 609                                 skb_queue_head(&sk->sk_receive_queue, skb);
 610                                 goto done;
 611                         }
 612                 }
 613
 614                 kfree_skb(skb);
 615         }
 616
 617         /* XXX Queue backlogged skbs */
 618
 619 done:
 620         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
 621         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
 622                 copied = rlen;
 623
 624         return copied;
 625 }
 626
 627 static const struct proto_ops llcp_sock_ops = {
 628         .family         = PF_NFC,
 629         .owner          = THIS_MODULE,
 630         .bind           = llcp_sock_bind,
 631         .connect        = llcp_sock_connect,
 632         .release        = llcp_sock_release,
 633         .socketpair     = sock_no_socketpair,
 634         .accept         = llcp_sock_accept,
 635         .getname        = llcp_sock_getname,
 636         .poll           = llcp_sock_poll,
 637         .ioctl          = sock_no_ioctl,
 638         .listen         = llcp_sock_listen,
 639         .shutdown       = sock_no_shutdown,
 640         .setsockopt     = sock_no_setsockopt,
 641         .getsockopt     = sock_no_getsockopt,
 642         .sendmsg        = llcp_sock_sendmsg,
 643         .recvmsg        = llcp_sock_recvmsg,
 644         .mmap           = sock_no_mmap,
 645 };
 646
 647 static void llcp_sock_destruct(struct sock *sk)
 648 {
 649         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 650
 651         pr_debug("%p\n", sk);
 652
 653         if (sk->sk_state == LLCP_CONNECTED)
 654                 nfc_put_device(llcp_sock->dev);
 655
 656         skb_queue_purge(&sk->sk_receive_queue);
 657
 658         nfc_llcp_sock_free(llcp_sock);
 659
 660         if (!sock_flag(sk, SOCK_DEAD)) {
 661                 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
 662                 return;
 663         }
 664 }
 665
 666 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
 667 {
 668         struct sock *sk;
 669         struct nfc_llcp_sock *llcp_sock;
 670
 671         sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
 672         if (!sk)
 673                 return NULL;
 674
 675         llcp_sock = nfc_llcp_sock(sk);
 676
 677         sock_init_data(sock, sk);
 678         sk->sk_state = LLCP_CLOSED;
 679         sk->sk_protocol = NFC_SOCKPROTO_LLCP;
 680         sk->sk_type = type;
 681         sk->sk_destruct = llcp_sock_destruct;
 682
 683         llcp_sock->ssap = 0;
 684         llcp_sock->dsap = LLCP_SAP_SDP;
 685         llcp_sock->rw = LLCP_DEFAULT_RW;
 686         llcp_sock->miu = LLCP_DEFAULT_MIU;
 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->accept_queue);
 694
 695         if (sock != NULL)
 696                 sock->state = SS_UNCONNECTED;
 697
 698         return sk;
 699 }
 700
 701 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
 702 {
 703         kfree(sock->service_name);
 704
 705         skb_queue_purge(&sock->tx_queue);
 706         skb_queue_purge(&sock->tx_pending_queue);
 707         skb_queue_purge(&sock->tx_backlog_queue);
 708
 709         list_del_init(&sock->accept_queue);
 710
 711         sock->parent = NULL;
 712
 713         nfc_llcp_local_put(sock->local);
 714 }
 715
 716 static int llcp_sock_create(struct net *net, struct socket *sock,
 717                             const struct nfc_protocol *nfc_proto)
 718 {
 719         struct sock *sk;
 720
 721         pr_debug("%p\n", sock);
 722
 723         if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
 724                 return -ESOCKTNOSUPPORT;
 725
 726         sock->ops = &llcp_sock_ops;
 727
 728         sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
 729         if (sk == NULL)
 730                 return -ENOMEM;
 731
 732         return 0;
 733 }
 734
 735 static const struct nfc_protocol llcp_nfc_proto = {
 736         .id       = NFC_SOCKPROTO_LLCP,
 737         .proto    = &llcp_sock_proto,
 738         .owner    = THIS_MODULE,
 739         .create   = llcp_sock_create
 740 };
 741
 742 int __init nfc_llcp_sock_init(void)
 743 {
 744         return nfc_proto_register(&llcp_nfc_proto);
 745 }
 746
 747 void nfc_llcp_sock_exit(void)
 748 {
 749         nfc_proto_unregister(&llcp_nfc_proto);
 750 }