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 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
 227                                char __user *optval, unsigned int optlen)
 228 {
 229         struct sock *sk = sock->sk;
 230         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 231         u32 opt;
 232         int err = 0;
 233
 234         pr_debug("%p optname %d\n", sk, optname);
 235
 236         if (level != SOL_NFC)
 237                 return -ENOPROTOOPT;
 238
 239         lock_sock(sk);
 240
 241         switch (optname) {
 242         case NFC_LLCP_RW:
 243                 if (sk->sk_state == LLCP_CONNECTED ||
 244                     sk->sk_state == LLCP_BOUND ||
 245                     sk->sk_state == LLCP_LISTEN) {
 246                         err = -EINVAL;
 247                         break;
 248                 }
 249
 250                 if (get_user(opt, (u32 __user *) optval)) {
 251                         err = -EFAULT;
 252                         break;
 253                 }
 254
 255                 if (opt > LLCP_MAX_RW) {
 256                         err = -EINVAL;
 257                         break;
 258                 }
 259
 260                 llcp_sock->rw = (u8) opt;
 261
 262                 break;
 263
 264         case NFC_LLCP_MIUX:
 265                 if (sk->sk_state == LLCP_CONNECTED ||
 266                     sk->sk_state == LLCP_BOUND ||
 267                     sk->sk_state == LLCP_LISTEN) {
 268                         err = -EINVAL;
 269                         break;
 270                 }
 271
 272                 if (get_user(opt, (u32 __user *) optval)) {
 273                         err = -EFAULT;
 274                         break;
 275                 }
 276
 277                 if (opt > LLCP_MAX_MIUX) {
 278                         err = -EINVAL;
 279                         break;
 280                 }
 281
 282                 llcp_sock->miux = cpu_to_be16((u16) opt);
 283
 284                 break;
 285
 286         default:
 287                 err = -ENOPROTOOPT;
 288                 break;
 289         }
 290
 291         release_sock(sk);
 292
 293         pr_debug("%p rw %d miux %d\n", llcp_sock,
 294                  llcp_sock->rw, llcp_sock->miux);
 295
 296         return err;
 297 }
 298
 299 static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
 300                                char __user *optval, int __user *optlen)
 301 {
 302         struct nfc_llcp_local *local;
 303         struct sock *sk = sock->sk;
 304         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 305         int len, err = 0;
 306         u16 miux, remote_miu;
 307         u8 rw;
 308
 309         pr_debug("%p optname %d\n", sk, optname);
 310
 311         if (level != SOL_NFC)
 312                 return -ENOPROTOOPT;
 313
 314         if (get_user(len, optlen))
 315                 return -EFAULT;
 316
 317         local = llcp_sock->local;
 318         if (!local)
 319                 return -ENODEV;
 320
 321         len = min_t(u32, len, sizeof(u32));
 322
 323         lock_sock(sk);
 324
 325         switch (optname) {
 326         case NFC_LLCP_RW:
 327                 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
 328                 if (put_user(rw, (u32 __user *) optval))
 329                         err = -EFAULT;
 330
 331                 break;
 332
 333         case NFC_LLCP_MIUX:
 334                 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
 335                         be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
 336
 337                 if (put_user(miux, (u32 __user *) optval))
 338                         err = -EFAULT;
 339
 340                 break;
 341
 342         case NFC_LLCP_REMOTE_MIU:
 343                 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
 344                                 local->remote_miu : llcp_sock->remote_miu;
 345
 346                 if (put_user(remote_miu, (u32 __user *) optval))
 347                         err = -EFAULT;
 348
 349                 break;
 350
 351         case NFC_LLCP_REMOTE_LTO:
 352                 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
 353                         err = -EFAULT;
 354
 355                 break;
 356
 357         case NFC_LLCP_REMOTE_RW:
 358                 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
 359                         err = -EFAULT;
 360
 361                 break;
 362
 363         default:
 364                 err = -ENOPROTOOPT;
 365                 break;
 366         }
 367
 368         release_sock(sk);
 369
 370         if (put_user(len, optlen))
 371                 return -EFAULT;
 372
 373         return err;
 374 }
 375
 376 void nfc_llcp_accept_unlink(struct sock *sk)
 377 {
 378         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 379
 380         pr_debug("state %d\n", sk->sk_state);
 381
 382         list_del_init(&llcp_sock->accept_queue);
 383         sk_acceptq_removed(llcp_sock->parent);
 384         llcp_sock->parent = NULL;
 385
 386         sock_put(sk);
 387 }
 388
 389 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
 390 {
 391         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 392         struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
 393
 394         /* Lock will be free from unlink */
 395         sock_hold(sk);
 396
 397         list_add_tail(&llcp_sock->accept_queue,
 398                       &llcp_sock_parent->accept_queue);
 399         llcp_sock->parent = parent;
 400         sk_acceptq_added(parent);
 401 }
 402
 403 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
 404                                      struct socket *newsock)
 405 {
 406         struct nfc_llcp_sock *lsk, *n, *llcp_parent;
 407         struct sock *sk;
 408
 409         llcp_parent = nfc_llcp_sock(parent);
 410
 411         list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
 412                                  accept_queue) {
 413                 sk = &lsk->sk;
 414                 lock_sock(sk);
 415
 416                 if (sk->sk_state == LLCP_CLOSED) {
 417                         release_sock(sk);
 418                         nfc_llcp_accept_unlink(sk);
 419                         continue;
 420                 }
 421
 422                 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
 423                         list_del_init(&lsk->accept_queue);
 424                         sock_put(sk);
 425
 426                         if (newsock)
 427                                 sock_graft(sk, newsock);
 428
 429                         release_sock(sk);
 430
 431                         pr_debug("Returning sk state %d\n", sk->sk_state);
 432
 433                         sk_acceptq_removed(parent);
 434
 435                         return sk;
 436                 }
 437
 438                 release_sock(sk);
 439         }
 440
 441         return NULL;
 442 }
 443
 444 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
 445                             int flags)
 446 {
 447         DECLARE_WAITQUEUE(wait, current);
 448         struct sock *sk = sock->sk, *new_sk;
 449         long timeo;
 450         int ret = 0;
 451
 452         pr_debug("parent %p\n", sk);
 453
 454         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 455
 456         if (sk->sk_state != LLCP_LISTEN) {
 457                 ret = -EBADFD;
 458                 goto error;
 459         }
 460
 461         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 462
 463         /* Wait for an incoming connection. */
 464         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 465         while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
 466                 set_current_state(TASK_INTERRUPTIBLE);
 467
 468                 if (!timeo) {
 469                         ret = -EAGAIN;
 470                         break;
 471                 }
 472
 473                 if (signal_pending(current)) {
 474                         ret = sock_intr_errno(timeo);
 475                         break;
 476                 }
 477
 478                 release_sock(sk);
 479                 timeo = schedule_timeout(timeo);
 480                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 481         }
 482         __set_current_state(TASK_RUNNING);
 483         remove_wait_queue(sk_sleep(sk), &wait);
 484
 485         if (ret)
 486                 goto error;
 487
 488         newsock->state = SS_CONNECTED;
 489
 490         pr_debug("new socket %p\n", new_sk);
 491
 492 error:
 493         release_sock(sk);
 494
 495         return ret;
 496 }
 497
 498 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
 499                              int *len, int peer)
 500 {
 501         struct sock *sk = sock->sk;
 502         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 503         DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
 504
 505         if (llcp_sock == NULL || llcp_sock->dev == NULL)
 506                 return -EBADFD;
 507
 508         pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
 509                  llcp_sock->dsap, llcp_sock->ssap);
 510
 511         memset(llcp_addr, 0, sizeof(*llcp_addr));
 512         *len = sizeof(struct sockaddr_nfc_llcp);
 513
 514         llcp_addr->sa_family = AF_NFC;
 515         llcp_addr->dev_idx = llcp_sock->dev->idx;
 516         llcp_addr->target_idx = llcp_sock->target_idx;
 517         llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
 518         llcp_addr->dsap = llcp_sock->dsap;
 519         llcp_addr->ssap = llcp_sock->ssap;
 520         llcp_addr->service_name_len = llcp_sock->service_name_len;
 521         memcpy(llcp_addr->service_name, llcp_sock->service_name,
 522                llcp_addr->service_name_len);
 523
 524         return 0;
 525 }
 526
 527 static inline unsigned int llcp_accept_poll(struct sock *parent)
 528 {
 529         struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
 530         struct sock *sk;
 531
 532         parent_sock = nfc_llcp_sock(parent);
 533
 534         list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
 535                                  accept_queue) {
 536                 sk = &llcp_sock->sk;
 537
 538                 if (sk->sk_state == LLCP_CONNECTED)
 539                         return POLLIN | POLLRDNORM;
 540         }
 541
 542         return 0;
 543 }
 544
 545 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
 546                                    poll_table *wait)
 547 {
 548         struct sock *sk = sock->sk;
 549         unsigned int mask = 0;
 550
 551         pr_debug("%p\n", sk);
 552
 553         sock_poll_wait(file, sk_sleep(sk), wait);
 554
 555         if (sk->sk_state == LLCP_LISTEN)
 556                 return llcp_accept_poll(sk);
 557
 558         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
 559                 mask |= POLLERR |
 560                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
 561
 562         if (!skb_queue_empty(&sk->sk_receive_queue))
 563                 mask |= POLLIN | POLLRDNORM;
 564
 565         if (sk->sk_state == LLCP_CLOSED)
 566                 mask |= POLLHUP;
 567
 568         if (sk->sk_shutdown & RCV_SHUTDOWN)
 569                 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
 570
 571         if (sk->sk_shutdown == SHUTDOWN_MASK)
 572                 mask |= POLLHUP;
 573
 574         if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
 575                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
 576         else
 577                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
 578
 579         pr_debug("mask 0x%x\n", mask);
 580
 581         return mask;
 582 }
 583
 584 static int llcp_sock_release(struct socket *sock)
 585 {
 586         struct sock *sk = sock->sk;
 587         struct nfc_llcp_local *local;
 588         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 589         int err = 0;
 590
 591         if (!sk)
 592                 return 0;
 593
 594         pr_debug("%p\n", sk);
 595
 596         local = llcp_sock->local;
 597         if (local == NULL) {
 598                 err = -ENODEV;
 599                 goto out;
 600         }
 601
 602         lock_sock(sk);
 603
 604         /* Send a DISC */
 605         if (sk->sk_state == LLCP_CONNECTED)
 606                 nfc_llcp_send_disconnect(llcp_sock);
 607
 608         if (sk->sk_state == LLCP_LISTEN) {
 609                 struct nfc_llcp_sock *lsk, *n;
 610                 struct sock *accept_sk;
 611
 612                 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
 613                                          accept_queue) {
 614                         accept_sk = &lsk->sk;
 615                         lock_sock(accept_sk);
 616
 617                         nfc_llcp_send_disconnect(lsk);
 618                         nfc_llcp_accept_unlink(accept_sk);
 619
 620                         release_sock(accept_sk);
 621                 }
 622         }
 623
 624         if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
 625                 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
 626
 627         release_sock(sk);
 628
 629         /* Keep this sock alive and therefore do not remove it from the sockets
 630          * list until the DISC PDU has been actually sent. Otherwise we would
 631          * reply with DM PDUs before sending the DISC one.
 632          */
 633         if (sk->sk_state == LLCP_DISCONNECTING)
 634                 return err;
 635
 636         if (sock->type == SOCK_RAW)
 637                 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
 638         else
 639                 nfc_llcp_sock_unlink(&local->sockets, sk);
 640
 641 out:
 642         sock_orphan(sk);
 643         sock_put(sk);
 644
 645         return err;
 646 }
 647
 648 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
 649                              int len, int flags)
 650 {
 651         struct sock *sk = sock->sk;
 652         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 653         struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
 654         struct nfc_dev *dev;
 655         struct nfc_llcp_local *local;
 656         int ret = 0;
 657
 658         pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
 659
 660         if (!addr || len < sizeof(struct sockaddr_nfc) ||
 661             addr->sa_family != AF_NFC)
 662                 return -EINVAL;
 663
 664         if (addr->service_name_len == 0 && addr->dsap == 0)
 665                 return -EINVAL;
 666
 667         pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
 668                  addr->target_idx, addr->nfc_protocol);
 669
 670         lock_sock(sk);
 671
 672         if (sk->sk_state == LLCP_CONNECTED) {
 673                 ret = -EISCONN;
 674                 goto error;
 675         }
 676
 677         dev = nfc_get_device(addr->dev_idx);
 678         if (dev == NULL) {
 679                 ret = -ENODEV;
 680                 goto error;
 681         }
 682
 683         local = nfc_llcp_find_local(dev);
 684         if (local == NULL) {
 685                 ret = -ENODEV;
 686                 goto put_dev;
 687         }
 688
 689         device_lock(&dev->dev);
 690         if (dev->dep_link_up == false) {
 691                 ret = -ENOLINK;
 692                 device_unlock(&dev->dev);
 693                 goto put_dev;
 694         }
 695         device_unlock(&dev->dev);
 696
 697         if (local->rf_mode == NFC_RF_INITIATOR &&
 698             addr->target_idx != local->target_idx) {
 699                 ret = -ENOLINK;
 700                 goto put_dev;
 701         }
 702
 703         llcp_sock->dev = dev;
 704         llcp_sock->local = nfc_llcp_local_get(local);
 705         llcp_sock->remote_miu = llcp_sock->local->remote_miu;
 706         llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
 707         if (llcp_sock->ssap == LLCP_SAP_MAX) {
 708                 ret = -ENOMEM;
 709                 goto put_dev;
 710         }
 711
 712         llcp_sock->reserved_ssap = llcp_sock->ssap;
 713
 714         if (addr->service_name_len == 0)
 715                 llcp_sock->dsap = addr->dsap;
 716         else
 717                 llcp_sock->dsap = LLCP_SAP_SDP;
 718         llcp_sock->nfc_protocol = addr->nfc_protocol;
 719         llcp_sock->service_name_len = min_t(unsigned int,
 720                                             addr->service_name_len,
 721                                             NFC_LLCP_MAX_SERVICE_NAME);
 722         llcp_sock->service_name = kmemdup(addr->service_name,
 723                                           llcp_sock->service_name_len,
 724                                           GFP_KERNEL);
 725
 726         nfc_llcp_sock_link(&local->connecting_sockets, sk);
 727
 728         ret = nfc_llcp_send_connect(llcp_sock);
 729         if (ret)
 730                 goto sock_unlink;
 731
 732         sk->sk_state = LLCP_CONNECTING;
 733
 734         ret = sock_wait_state(sk, LLCP_CONNECTED,
 735                               sock_sndtimeo(sk, flags & O_NONBLOCK));
 736         if (ret && ret != -EINPROGRESS)
 737                 goto sock_unlink;
 738
 739         release_sock(sk);
 740
 741         return ret;
 742
 743 sock_unlink:
 744         nfc_llcp_put_ssap(local, llcp_sock->ssap);
 745
 746         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
 747
 748 put_dev:
 749         nfc_put_device(dev);
 750
 751 error:
 752         release_sock(sk);
 753         return ret;
 754 }
 755
 756 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 757                              struct msghdr *msg, size_t len)
 758 {
 759         struct sock *sk = sock->sk;
 760         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 761         int ret;
 762
 763         pr_debug("sock %p sk %p", sock, sk);
 764
 765         ret = sock_error(sk);
 766         if (ret)
 767                 return ret;
 768
 769         if (msg->msg_flags & MSG_OOB)
 770                 return -EOPNOTSUPP;
 771
 772         lock_sock(sk);
 773
 774         if (sk->sk_type == SOCK_DGRAM) {
 775                 struct sockaddr_nfc_llcp *addr =
 776                         (struct sockaddr_nfc_llcp *)msg->msg_name;
 777
 778                 if (msg->msg_namelen < sizeof(*addr)) {
 779                         release_sock(sk);
 780                         return -EINVAL;
 781                 }
 782
 783                 release_sock(sk);
 784
 785                 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
 786                                               msg, len);
 787         }
 788
 789         if (sk->sk_state != LLCP_CONNECTED) {
 790                 release_sock(sk);
 791                 return -ENOTCONN;
 792         }
 793
 794         release_sock(sk);
 795
 796         return nfc_llcp_send_i_frame(llcp_sock, msg, len);
 797 }
 798
 799 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 800                              struct msghdr *msg, size_t len, int flags)
 801 {
 802         int noblock = flags & MSG_DONTWAIT;
 803         struct sock *sk = sock->sk;
 804         unsigned int copied, rlen;
 805         struct sk_buff *skb, *cskb;
 806         int err = 0;
 807
 808         pr_debug("%p %zu\n", sk, len);
 809
 810         lock_sock(sk);
 811
 812         if (sk->sk_state == LLCP_CLOSED &&
 813             skb_queue_empty(&sk->sk_receive_queue)) {
 814                 release_sock(sk);
 815                 return 0;
 816         }
 817
 818         release_sock(sk);
 819
 820         if (flags & (MSG_OOB))
 821                 return -EOPNOTSUPP;
 822
 823         skb = skb_recv_datagram(sk, flags, noblock, &err);
 824         if (!skb) {
 825                 pr_err("Recv datagram failed state %d %d %d",
 826                        sk->sk_state, err, sock_error(sk));
 827
 828                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 829                         return 0;
 830
 831                 return err;
 832         }
 833
 834         rlen = skb->len;                /* real length of skb */
 835         copied = min_t(unsigned int, rlen, len);
 836
 837         cskb = skb;
 838         if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
 839                 if (!(flags & MSG_PEEK))
 840                         skb_queue_head(&sk->sk_receive_queue, skb);
 841                 return -EFAULT;
 842         }
 843
 844         sock_recv_timestamp(msg, sk, skb);
 845
 846         if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
 847                 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
 848                 struct sockaddr_nfc_llcp *sockaddr =
 849                         (struct sockaddr_nfc_llcp *) msg->msg_name;
 850
 851                 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
 852
 853                 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
 854
 855                 memset(sockaddr, 0, sizeof(*sockaddr));
 856                 sockaddr->sa_family = AF_NFC;
 857                 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
 858                 sockaddr->dsap = ui_cb->dsap;
 859                 sockaddr->ssap = ui_cb->ssap;
 860         }
 861
 862         /* Mark read part of skb as used */
 863         if (!(flags & MSG_PEEK)) {
 864
 865                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
 866                 if (sk->sk_type == SOCK_STREAM ||
 867                     sk->sk_type == SOCK_DGRAM ||
 868                     sk->sk_type == SOCK_RAW) {
 869                         skb_pull(skb, copied);
 870                         if (skb->len) {
 871                                 skb_queue_head(&sk->sk_receive_queue, skb);
 872                                 goto done;
 873                         }
 874                 }
 875
 876                 kfree_skb(skb);
 877         }
 878
 879         /* XXX Queue backlogged skbs */
 880
 881 done:
 882         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
 883         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
 884                 copied = rlen;
 885
 886         return copied;
 887 }
 888
 889 static const struct proto_ops llcp_sock_ops = {
 890         .family         = PF_NFC,
 891         .owner          = THIS_MODULE,
 892         .bind           = llcp_sock_bind,
 893         .connect        = llcp_sock_connect,
 894         .release        = llcp_sock_release,
 895         .socketpair     = sock_no_socketpair,
 896         .accept         = llcp_sock_accept,
 897         .getname        = llcp_sock_getname,
 898         .poll           = llcp_sock_poll,
 899         .ioctl          = sock_no_ioctl,
 900         .listen         = llcp_sock_listen,
 901         .shutdown       = sock_no_shutdown,
 902         .setsockopt     = nfc_llcp_setsockopt,
 903         .getsockopt     = nfc_llcp_getsockopt,
 904         .sendmsg        = llcp_sock_sendmsg,
 905         .recvmsg        = llcp_sock_recvmsg,
 906         .mmap           = sock_no_mmap,
 907 };
 908
 909 static const struct proto_ops llcp_rawsock_ops = {
 910         .family         = PF_NFC,
 911         .owner          = THIS_MODULE,
 912         .bind           = llcp_raw_sock_bind,
 913         .connect        = sock_no_connect,
 914         .release        = llcp_sock_release,
 915         .socketpair     = sock_no_socketpair,
 916         .accept         = sock_no_accept,
 917         .getname        = llcp_sock_getname,
 918         .poll           = llcp_sock_poll,
 919         .ioctl          = sock_no_ioctl,
 920         .listen         = sock_no_listen,
 921         .shutdown       = sock_no_shutdown,
 922         .setsockopt     = sock_no_setsockopt,
 923         .getsockopt     = sock_no_getsockopt,
 924         .sendmsg        = sock_no_sendmsg,
 925         .recvmsg        = llcp_sock_recvmsg,
 926         .mmap           = sock_no_mmap,
 927 };
 928
 929 static void llcp_sock_destruct(struct sock *sk)
 930 {
 931         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 932
 933         pr_debug("%p\n", sk);
 934
 935         if (sk->sk_state == LLCP_CONNECTED)
 936                 nfc_put_device(llcp_sock->dev);
 937
 938         skb_queue_purge(&sk->sk_receive_queue);
 939
 940         nfc_llcp_sock_free(llcp_sock);
 941
 942         if (!sock_flag(sk, SOCK_DEAD)) {
 943                 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
 944                 return;
 945         }
 946 }
 947
 948 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
 949 {
 950         struct sock *sk;
 951         struct nfc_llcp_sock *llcp_sock;
 952
 953         sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
 954         if (!sk)
 955                 return NULL;
 956
 957         llcp_sock = nfc_llcp_sock(sk);
 958
 959         sock_init_data(sock, sk);
 960         sk->sk_state = LLCP_CLOSED;
 961         sk->sk_protocol = NFC_SOCKPROTO_LLCP;
 962         sk->sk_type = type;
 963         sk->sk_destruct = llcp_sock_destruct;
 964
 965         llcp_sock->ssap = 0;
 966         llcp_sock->dsap = LLCP_SAP_SDP;
 967         llcp_sock->rw = LLCP_MAX_RW + 1;
 968         llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
 969         llcp_sock->send_n = llcp_sock->send_ack_n = 0;
 970         llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
 971         llcp_sock->remote_ready = 1;
 972         llcp_sock->reserved_ssap = LLCP_SAP_MAX;
 973         nfc_llcp_socket_remote_param_init(llcp_sock);
 974         skb_queue_head_init(&llcp_sock->tx_queue);
 975         skb_queue_head_init(&llcp_sock->tx_pending_queue);
 976         INIT_LIST_HEAD(&llcp_sock->accept_queue);
 977
 978         if (sock != NULL)
 979                 sock->state = SS_UNCONNECTED;
 980
 981         return sk;
 982 }
 983
 984 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
 985 {
 986         kfree(sock->service_name);
 987
 988         skb_queue_purge(&sock->tx_queue);
 989         skb_queue_purge(&sock->tx_pending_queue);
 990
 991         list_del_init(&sock->accept_queue);
 992
 993         sock->parent = NULL;
 994
 995         nfc_llcp_local_put(sock->local);
 996 }
 997
 998 static int llcp_sock_create(struct net *net, struct socket *sock,
 999                             const struct nfc_protocol *nfc_proto)
1000 {
1001         struct sock *sk;
1002
1003         pr_debug("%p\n", sock);
1004
1005         if (sock->type != SOCK_STREAM &&
1006             sock->type != SOCK_DGRAM &&
1007             sock->type != SOCK_RAW)
1008                 return -ESOCKTNOSUPPORT;
1009
1010         if (sock->type == SOCK_RAW)
1011                 sock->ops = &llcp_rawsock_ops;
1012         else
1013                 sock->ops = &llcp_sock_ops;
1014
1015         sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
1016         if (sk == NULL)
1017                 return -ENOMEM;
1018
1019         return 0;
1020 }
1021
1022 static const struct nfc_protocol llcp_nfc_proto = {
1023         .id       = NFC_SOCKPROTO_LLCP,
1024         .proto    = &llcp_sock_proto,
1025         .owner    = THIS_MODULE,
1026         .create   = llcp_sock_create
1027 };
1028
1029 int __init nfc_llcp_sock_init(void)
1030 {
1031         return nfc_proto_register(&llcp_nfc_proto);
1032 }
1033
1034 void nfc_llcp_sock_exit(void)
1035 {
1036         nfc_proto_unregister(&llcp_nfc_proto);
1037 }