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         if (!addr || addr->sa_family != AF_NFC)
  82                 return -EINVAL;
  83
  84         pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
  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_SAP_MAX) {
 125                 ret = -EADDRINUSE;
 126                 goto put_dev;
 127         }
 128
 129         llcp_sock->reserved_ssap = llcp_sock->ssap;
 130
 131         nfc_llcp_sock_link(&local->sockets, sk);
 132
 133         pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
 134
 135         sk->sk_state = LLCP_BOUND;
 136
 137 put_dev:
 138         nfc_put_device(dev);
 139
 140 error:
 141         release_sock(sk);
 142         return ret;
 143 }
 144
 145 static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
 146                               int alen)
 147 {
 148         struct sock *sk = sock->sk;
 149         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 150         struct nfc_llcp_local *local;
 151         struct nfc_dev *dev;
 152         struct sockaddr_nfc_llcp llcp_addr;
 153         int len, ret = 0;
 154
 155         if (!addr || addr->sa_family != AF_NFC)
 156                 return -EINVAL;
 157
 158         pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
 159
 160         memset(&llcp_addr, 0, sizeof(llcp_addr));
 161         len = min_t(unsigned int, sizeof(llcp_addr), alen);
 162         memcpy(&llcp_addr, addr, len);
 163
 164         lock_sock(sk);
 165
 166         if (sk->sk_state != LLCP_CLOSED) {
 167                 ret = -EBADFD;
 168                 goto error;
 169         }
 170
 171         dev = nfc_get_device(llcp_addr.dev_idx);
 172         if (dev == NULL) {
 173                 ret = -ENODEV;
 174                 goto error;
 175         }
 176
 177         local = nfc_llcp_find_local(dev);
 178         if (local == NULL) {
 179                 ret = -ENODEV;
 180                 goto put_dev;
 181         }
 182
 183         llcp_sock->dev = dev;
 184         llcp_sock->local = nfc_llcp_local_get(local);
 185         llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
 186
 187         nfc_llcp_sock_link(&local->raw_sockets, sk);
 188
 189         sk->sk_state = LLCP_BOUND;
 190
 191 put_dev:
 192         nfc_put_device(dev);
 193
 194 error:
 195         release_sock(sk);
 196         return ret;
 197 }
 198
 199 static int llcp_sock_listen(struct socket *sock, int backlog)
 200 {
 201         struct sock *sk = sock->sk;
 202         int ret = 0;
 203
 204         pr_debug("sk %p backlog %d\n", sk, backlog);
 205
 206         lock_sock(sk);
 207
 208         if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
 209             sk->sk_state != LLCP_BOUND) {
 210                 ret = -EBADFD;
 211                 goto error;
 212         }
 213
 214         sk->sk_max_ack_backlog = backlog;
 215         sk->sk_ack_backlog = 0;
 216
 217         pr_debug("Socket listening\n");
 218         sk->sk_state = LLCP_LISTEN;
 219
 220 error:
 221         release_sock(sk);
 222
 223         return ret;
 224 }
 225
 226 void nfc_llcp_accept_unlink(struct sock *sk)
 227 {
 228         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 229
 230         pr_debug("state %d\n", sk->sk_state);
 231
 232         list_del_init(&llcp_sock->accept_queue);
 233         sk_acceptq_removed(llcp_sock->parent);
 234         llcp_sock->parent = NULL;
 235
 236         sock_put(sk);
 237 }
 238
 239 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
 240 {
 241         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 242         struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
 243
 244         /* Lock will be free from unlink */
 245         sock_hold(sk);
 246
 247         list_add_tail(&llcp_sock->accept_queue,
 248                       &llcp_sock_parent->accept_queue);
 249         llcp_sock->parent = parent;
 250         sk_acceptq_added(parent);
 251 }
 252
 253 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
 254                                      struct socket *newsock)
 255 {
 256         struct nfc_llcp_sock *lsk, *n, *llcp_parent;
 257         struct sock *sk;
 258
 259         llcp_parent = nfc_llcp_sock(parent);
 260
 261         list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
 262                                  accept_queue) {
 263                 sk = &lsk->sk;
 264                 lock_sock(sk);
 265
 266                 if (sk->sk_state == LLCP_CLOSED) {
 267                         release_sock(sk);
 268                         nfc_llcp_accept_unlink(sk);
 269                         continue;
 270                 }
 271
 272                 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
 273                         nfc_llcp_accept_unlink(sk);
 274                         if (newsock)
 275                                 sock_graft(sk, newsock);
 276
 277                         release_sock(sk);
 278
 279                         pr_debug("Returning sk state %d\n", sk->sk_state);
 280
 281                         sk_acceptq_removed(parent);
 282
 283                         return sk;
 284                 }
 285
 286                 release_sock(sk);
 287         }
 288
 289         return NULL;
 290 }
 291
 292 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
 293                             int flags)
 294 {
 295         DECLARE_WAITQUEUE(wait, current);
 296         struct sock *sk = sock->sk, *new_sk;
 297         long timeo;
 298         int ret = 0;
 299
 300         pr_debug("parent %p\n", sk);
 301
 302         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 303
 304         if (sk->sk_state != LLCP_LISTEN) {
 305                 ret = -EBADFD;
 306                 goto error;
 307         }
 308
 309         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 310
 311         /* Wait for an incoming connection. */
 312         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 313         while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
 314                 set_current_state(TASK_INTERRUPTIBLE);
 315
 316                 if (!timeo) {
 317                         ret = -EAGAIN;
 318                         break;
 319                 }
 320
 321                 if (signal_pending(current)) {
 322                         ret = sock_intr_errno(timeo);
 323                         break;
 324                 }
 325
 326                 release_sock(sk);
 327                 timeo = schedule_timeout(timeo);
 328                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 329         }
 330         __set_current_state(TASK_RUNNING);
 331         remove_wait_queue(sk_sleep(sk), &wait);
 332
 333         if (ret)
 334                 goto error;
 335
 336         newsock->state = SS_CONNECTED;
 337
 338         pr_debug("new socket %p\n", new_sk);
 339
 340 error:
 341         release_sock(sk);
 342
 343         return ret;
 344 }
 345
 346 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
 347                              int *len, int peer)
 348 {
 349         struct sock *sk = sock->sk;
 350         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 351         DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
 352
 353         if (llcp_sock == NULL || llcp_sock->dev == NULL)
 354                 return -EBADFD;
 355
 356         pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
 357                  llcp_sock->dsap, llcp_sock->ssap);
 358
 359         uaddr->sa_family = AF_NFC;
 360
 361         *len = sizeof(struct sockaddr_nfc_llcp);
 362
 363         llcp_addr->dev_idx = llcp_sock->dev->idx;
 364         llcp_addr->target_idx = llcp_sock->target_idx;
 365         llcp_addr->dsap = llcp_sock->dsap;
 366         llcp_addr->ssap = llcp_sock->ssap;
 367         llcp_addr->service_name_len = llcp_sock->service_name_len;
 368         memcpy(llcp_addr->service_name, llcp_sock->service_name,
 369                llcp_addr->service_name_len);
 370
 371         return 0;
 372 }
 373
 374 static inline unsigned int llcp_accept_poll(struct sock *parent)
 375 {
 376         struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
 377         struct sock *sk;
 378
 379         parent_sock = nfc_llcp_sock(parent);
 380
 381         list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
 382                                  accept_queue) {
 383                 sk = &llcp_sock->sk;
 384
 385                 if (sk->sk_state == LLCP_CONNECTED)
 386                         return POLLIN | POLLRDNORM;
 387         }
 388
 389         return 0;
 390 }
 391
 392 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
 393                                    poll_table *wait)
 394 {
 395         struct sock *sk = sock->sk;
 396         unsigned int mask = 0;
 397
 398         pr_debug("%p\n", sk);
 399
 400         sock_poll_wait(file, sk_sleep(sk), wait);
 401
 402         if (sk->sk_state == LLCP_LISTEN)
 403                 return llcp_accept_poll(sk);
 404
 405         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
 406                 mask |= POLLERR;
 407
 408         if (!skb_queue_empty(&sk->sk_receive_queue))
 409                 mask |= POLLIN | POLLRDNORM;
 410
 411         if (sk->sk_state == LLCP_CLOSED)
 412                 mask |= POLLHUP;
 413
 414         if (sk->sk_shutdown & RCV_SHUTDOWN)
 415                 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
 416
 417         if (sk->sk_shutdown == SHUTDOWN_MASK)
 418                 mask |= POLLHUP;
 419
 420         if (sock_writeable(sk))
 421                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
 422         else
 423                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 424
 425         pr_debug("mask 0x%x\n", mask);
 426
 427         return mask;
 428 }
 429
 430 static int llcp_sock_release(struct socket *sock)
 431 {
 432         struct sock *sk = sock->sk;
 433         struct nfc_llcp_local *local;
 434         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 435         int err = 0;
 436
 437         if (!sk)
 438                 return 0;
 439
 440         pr_debug("%p\n", sk);
 441
 442         local = llcp_sock->local;
 443         if (local == NULL) {
 444                 err = -ENODEV;
 445                 goto out;
 446         }
 447
 448         lock_sock(sk);
 449
 450         /* Send a DISC */
 451         if (sk->sk_state == LLCP_CONNECTED)
 452                 nfc_llcp_disconnect(llcp_sock);
 453
 454         if (sk->sk_state == LLCP_LISTEN) {
 455                 struct nfc_llcp_sock *lsk, *n;
 456                 struct sock *accept_sk;
 457
 458                 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
 459                                          accept_queue) {
 460                         accept_sk = &lsk->sk;
 461                         lock_sock(accept_sk);
 462
 463                         nfc_llcp_disconnect(lsk);
 464                         nfc_llcp_accept_unlink(accept_sk);
 465
 466                         release_sock(accept_sk);
 467
 468                         sock_orphan(accept_sk);
 469                 }
 470         }
 471
 472         if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
 473                 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
 474
 475         release_sock(sk);
 476
 477         if (sock->type == SOCK_RAW)
 478                 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
 479         else
 480                 nfc_llcp_sock_unlink(&local->sockets, sk);
 481
 482 out:
 483         sock_orphan(sk);
 484         sock_put(sk);
 485
 486         return err;
 487 }
 488
 489 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
 490                              int len, int flags)
 491 {
 492         struct sock *sk = sock->sk;
 493         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 494         struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
 495         struct nfc_dev *dev;
 496         struct nfc_llcp_local *local;
 497         int ret = 0;
 498
 499         pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
 500
 501         if (!addr || len < sizeof(struct sockaddr_nfc) ||
 502             addr->sa_family != AF_NFC)
 503                 return -EINVAL;
 504
 505         if (addr->service_name_len == 0 && addr->dsap == 0)
 506                 return -EINVAL;
 507
 508         pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
 509                  addr->target_idx, addr->nfc_protocol);
 510
 511         lock_sock(sk);
 512
 513         if (sk->sk_state == LLCP_CONNECTED) {
 514                 ret = -EISCONN;
 515                 goto error;
 516         }
 517
 518         dev = nfc_get_device(addr->dev_idx);
 519         if (dev == NULL) {
 520                 ret = -ENODEV;
 521                 goto error;
 522         }
 523
 524         local = nfc_llcp_find_local(dev);
 525         if (local == NULL) {
 526                 ret = -ENODEV;
 527                 goto put_dev;
 528         }
 529
 530         device_lock(&dev->dev);
 531         if (dev->dep_link_up == false) {
 532                 ret = -ENOLINK;
 533                 device_unlock(&dev->dev);
 534                 goto put_dev;
 535         }
 536         device_unlock(&dev->dev);
 537
 538         if (local->rf_mode == NFC_RF_INITIATOR &&
 539             addr->target_idx != local->target_idx) {
 540                 ret = -ENOLINK;
 541                 goto put_dev;
 542         }
 543
 544         llcp_sock->dev = dev;
 545         llcp_sock->local = nfc_llcp_local_get(local);
 546         llcp_sock->miu = llcp_sock->local->remote_miu;
 547         llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
 548         if (llcp_sock->ssap == LLCP_SAP_MAX) {
 549                 ret = -ENOMEM;
 550                 goto put_dev;
 551         }
 552
 553         llcp_sock->reserved_ssap = llcp_sock->ssap;
 554
 555         if (addr->service_name_len == 0)
 556                 llcp_sock->dsap = addr->dsap;
 557         else
 558                 llcp_sock->dsap = LLCP_SAP_SDP;
 559         llcp_sock->nfc_protocol = addr->nfc_protocol;
 560         llcp_sock->service_name_len = min_t(unsigned int,
 561                                             addr->service_name_len,
 562                                             NFC_LLCP_MAX_SERVICE_NAME);
 563         llcp_sock->service_name = kmemdup(addr->service_name,
 564                                           llcp_sock->service_name_len,
 565                                           GFP_KERNEL);
 566
 567         nfc_llcp_sock_link(&local->connecting_sockets, sk);
 568
 569         ret = nfc_llcp_send_connect(llcp_sock);
 570         if (ret)
 571                 goto sock_unlink;
 572
 573         ret = sock_wait_state(sk, LLCP_CONNECTED,
 574                               sock_sndtimeo(sk, flags & O_NONBLOCK));
 575         if (ret)
 576                 goto sock_unlink;
 577
 578         release_sock(sk);
 579
 580         return 0;
 581
 582 sock_unlink:
 583         nfc_llcp_put_ssap(local, llcp_sock->ssap);
 584
 585         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
 586
 587 put_dev:
 588         nfc_put_device(dev);
 589
 590 error:
 591         release_sock(sk);
 592         return ret;
 593 }
 594
 595 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 596                              struct msghdr *msg, size_t len)
 597 {
 598         struct sock *sk = sock->sk;
 599         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 600         int ret;
 601
 602         pr_debug("sock %p sk %p", sock, sk);
 603
 604         ret = sock_error(sk);
 605         if (ret)
 606                 return ret;
 607
 608         if (msg->msg_flags & MSG_OOB)
 609                 return -EOPNOTSUPP;
 610
 611         lock_sock(sk);
 612
 613         if (sk->sk_type == SOCK_DGRAM) {
 614                 struct sockaddr_nfc_llcp *addr =
 615                         (struct sockaddr_nfc_llcp *)msg->msg_name;
 616
 617                 if (msg->msg_namelen < sizeof(*addr)) {
 618                         release_sock(sk);
 619                         return -EINVAL;
 620                 }
 621
 622                 release_sock(sk);
 623
 624                 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
 625                                               msg, len);
 626         }
 627
 628         if (sk->sk_state != LLCP_CONNECTED) {
 629                 release_sock(sk);
 630                 return -ENOTCONN;
 631         }
 632
 633         release_sock(sk);
 634
 635         return nfc_llcp_send_i_frame(llcp_sock, msg, len);
 636 }
 637
 638 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 639                              struct msghdr *msg, size_t len, int flags)
 640 {
 641         int noblock = flags & MSG_DONTWAIT;
 642         struct sock *sk = sock->sk;
 643         unsigned int copied, rlen;
 644         struct sk_buff *skb, *cskb;
 645         int err = 0;
 646
 647         pr_debug("%p %zu\n", sk, len);
 648
 649         lock_sock(sk);
 650
 651         if (sk->sk_state == LLCP_CLOSED &&
 652             skb_queue_empty(&sk->sk_receive_queue)) {
 653                 release_sock(sk);
 654                 return 0;
 655         }
 656
 657         release_sock(sk);
 658
 659         if (flags & (MSG_OOB))
 660                 return -EOPNOTSUPP;
 661
 662         skb = skb_recv_datagram(sk, flags, noblock, &err);
 663         if (!skb) {
 664                 pr_err("Recv datagram failed state %d %d %d",
 665                        sk->sk_state, err, sock_error(sk));
 666
 667                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 668                         return 0;
 669
 670                 return err;
 671         }
 672
 673         rlen = skb->len;                /* real length of skb */
 674         copied = min_t(unsigned int, rlen, len);
 675
 676         cskb = skb;
 677         if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
 678                 if (!(flags & MSG_PEEK))
 679                         skb_queue_head(&sk->sk_receive_queue, skb);
 680                 return -EFAULT;
 681         }
 682
 683         sock_recv_timestamp(msg, sk, skb);
 684
 685         if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
 686                 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
 687                 struct sockaddr_nfc_llcp *sockaddr =
 688                         (struct sockaddr_nfc_llcp *) msg->msg_name;
 689
 690                 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
 691
 692                 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
 693
 694                 sockaddr->sa_family = AF_NFC;
 695                 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
 696                 sockaddr->dsap = ui_cb->dsap;
 697                 sockaddr->ssap = ui_cb->ssap;
 698         }
 699
 700         /* Mark read part of skb as used */
 701         if (!(flags & MSG_PEEK)) {
 702
 703                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
 704                 if (sk->sk_type == SOCK_STREAM ||
 705                     sk->sk_type == SOCK_DGRAM ||
 706                     sk->sk_type == SOCK_RAW) {
 707                         skb_pull(skb, copied);
 708                         if (skb->len) {
 709                                 skb_queue_head(&sk->sk_receive_queue, skb);
 710                                 goto done;
 711                         }
 712                 }
 713
 714                 kfree_skb(skb);
 715         }
 716
 717         /* XXX Queue backlogged skbs */
 718
 719 done:
 720         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
 721         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
 722                 copied = rlen;
 723
 724         return copied;
 725 }
 726
 727 static const struct proto_ops llcp_sock_ops = {
 728         .family         = PF_NFC,
 729         .owner          = THIS_MODULE,
 730         .bind           = llcp_sock_bind,
 731         .connect        = llcp_sock_connect,
 732         .release        = llcp_sock_release,
 733         .socketpair     = sock_no_socketpair,
 734         .accept         = llcp_sock_accept,
 735         .getname        = llcp_sock_getname,
 736         .poll           = llcp_sock_poll,
 737         .ioctl          = sock_no_ioctl,
 738         .listen         = llcp_sock_listen,
 739         .shutdown       = sock_no_shutdown,
 740         .setsockopt     = sock_no_setsockopt,
 741         .getsockopt     = sock_no_getsockopt,
 742         .sendmsg        = llcp_sock_sendmsg,
 743         .recvmsg        = llcp_sock_recvmsg,
 744         .mmap           = sock_no_mmap,
 745 };
 746
 747 static const struct proto_ops llcp_rawsock_ops = {
 748         .family         = PF_NFC,
 749         .owner          = THIS_MODULE,
 750         .bind           = llcp_raw_sock_bind,
 751         .connect        = sock_no_connect,
 752         .release        = llcp_sock_release,
 753         .socketpair     = sock_no_socketpair,
 754         .accept         = sock_no_accept,
 755         .getname        = llcp_sock_getname,
 756         .poll           = llcp_sock_poll,
 757         .ioctl          = sock_no_ioctl,
 758         .listen         = sock_no_listen,
 759         .shutdown       = sock_no_shutdown,
 760         .setsockopt     = sock_no_setsockopt,
 761         .getsockopt     = sock_no_getsockopt,
 762         .sendmsg        = sock_no_sendmsg,
 763         .recvmsg        = llcp_sock_recvmsg,
 764         .mmap           = sock_no_mmap,
 765 };
 766
 767 static void llcp_sock_destruct(struct sock *sk)
 768 {
 769         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 770
 771         pr_debug("%p\n", sk);
 772
 773         if (sk->sk_state == LLCP_CONNECTED)
 774                 nfc_put_device(llcp_sock->dev);
 775
 776         skb_queue_purge(&sk->sk_receive_queue);
 777
 778         nfc_llcp_sock_free(llcp_sock);
 779
 780         if (!sock_flag(sk, SOCK_DEAD)) {
 781                 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
 782                 return;
 783         }
 784 }
 785
 786 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
 787 {
 788         struct sock *sk;
 789         struct nfc_llcp_sock *llcp_sock;
 790
 791         sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
 792         if (!sk)
 793                 return NULL;
 794
 795         llcp_sock = nfc_llcp_sock(sk);
 796
 797         sock_init_data(sock, sk);
 798         sk->sk_state = LLCP_CLOSED;
 799         sk->sk_protocol = NFC_SOCKPROTO_LLCP;
 800         sk->sk_type = type;
 801         sk->sk_destruct = llcp_sock_destruct;
 802
 803         llcp_sock->ssap = 0;
 804         llcp_sock->dsap = LLCP_SAP_SDP;
 805         llcp_sock->rw = LLCP_DEFAULT_RW;
 806         llcp_sock->miu = LLCP_DEFAULT_MIU;
 807         llcp_sock->send_n = llcp_sock->send_ack_n = 0;
 808         llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
 809         llcp_sock->remote_ready = 1;
 810         llcp_sock->reserved_ssap = LLCP_SAP_MAX;
 811         skb_queue_head_init(&llcp_sock->tx_queue);
 812         skb_queue_head_init(&llcp_sock->tx_pending_queue);
 813         INIT_LIST_HEAD(&llcp_sock->accept_queue);
 814
 815         if (sock != NULL)
 816                 sock->state = SS_UNCONNECTED;
 817
 818         return sk;
 819 }
 820
 821 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
 822 {
 823         kfree(sock->service_name);
 824
 825         skb_queue_purge(&sock->tx_queue);
 826         skb_queue_purge(&sock->tx_pending_queue);
 827
 828         list_del_init(&sock->accept_queue);
 829
 830         sock->parent = NULL;
 831
 832         nfc_llcp_local_put(sock->local);
 833 }
 834
 835 static int llcp_sock_create(struct net *net, struct socket *sock,
 836                             const struct nfc_protocol *nfc_proto)
 837 {
 838         struct sock *sk;
 839
 840         pr_debug("%p\n", sock);
 841
 842         if (sock->type != SOCK_STREAM &&
 843             sock->type != SOCK_DGRAM &&
 844             sock->type != SOCK_RAW)
 845                 return -ESOCKTNOSUPPORT;
 846
 847         if (sock->type == SOCK_RAW)
 848                 sock->ops = &llcp_rawsock_ops;
 849         else
 850                 sock->ops = &llcp_sock_ops;
 851
 852         sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
 853         if (sk == NULL)
 854                 return -ENOMEM;
 855
 856         return 0;
 857 }
 858
 859 static const struct nfc_protocol llcp_nfc_proto = {
 860         .id       = NFC_SOCKPROTO_LLCP,
 861         .proto    = &llcp_sock_proto,
 862         .owner    = THIS_MODULE,
 863         .create   = llcp_sock_create
 864 };
 865
 866 int __init nfc_llcp_sock_init(void)
 867 {
 868         return nfc_proto_register(&llcp_nfc_proto);
 869 }
 870
 871 void nfc_llcp_sock_exit(void)
 872 {
 873         nfc_proto_unregister(&llcp_nfc_proto);
 874 }