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