net/nfc/llcp_sock.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2011  Intel Corporation. All rights reserved.
   4  */
   5
   6 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
   7
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/nfc.h>
  12 #include <linux/sched/signal.h>
  13
  14 #include "nfc.h"
  15 #include "llcp.h"
  16
  17 static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
  18 {
  19         DECLARE_WAITQUEUE(wait, current);
  20         int err = 0;
  21
  22         pr_debug("sk %p", sk);
  23
  24         add_wait_queue(sk_sleep(sk), &wait);
  25         set_current_state(TASK_INTERRUPTIBLE);
  26
  27         while (sk->sk_state != state) {
  28                 if (!timeo) {
  29                         err = -EINPROGRESS;
  30                         break;
  31                 }
  32
  33                 if (signal_pending(current)) {
  34                         err = sock_intr_errno(timeo);
  35                         break;
  36                 }
  37
  38                 release_sock(sk);
  39                 timeo = schedule_timeout(timeo);
  40                 lock_sock(sk);
  41                 set_current_state(TASK_INTERRUPTIBLE);
  42
  43                 err = sock_error(sk);
  44                 if (err)
  45                         break;
  46         }
  47
  48         __set_current_state(TASK_RUNNING);
  49         remove_wait_queue(sk_sleep(sk), &wait);
  50         return err;
  51 }
  52
  53 static struct proto llcp_sock_proto = {
  54         .name     = "NFC_LLCP",
  55         .owner    = THIS_MODULE,
  56         .obj_size = sizeof(struct nfc_llcp_sock),
  57 };
  58
  59 static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
  60 {
  61         struct sock *sk = sock->sk;
  62         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
  63         struct nfc_llcp_local *local;
  64         struct nfc_dev *dev;
  65         struct sockaddr_nfc_llcp llcp_addr;
  66         int len, ret = 0;
  67
  68         if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
  69             addr->sa_family != AF_NFC)
  70                 return -EINVAL;
  71
  72         pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
  73
  74         memset(&llcp_addr, 0, sizeof(llcp_addr));
  75         len = min_t(unsigned int, sizeof(llcp_addr), alen);
  76         memcpy(&llcp_addr, addr, len);
  77
  78         /* This is going to be a listening socket, dsap must be 0 */
  79         if (llcp_addr.dsap != 0)
  80                 return -EINVAL;
  81
  82         lock_sock(sk);
  83
  84         if (sk->sk_state != LLCP_CLOSED) {
  85                 ret = -EBADFD;
  86                 goto error;
  87         }
  88
  89         dev = nfc_get_device(llcp_addr.dev_idx);
  90         if (dev == NULL) {
  91                 ret = -ENODEV;
  92                 goto error;
  93         }
  94
  95         local = nfc_llcp_find_local(dev);
  96         if (local == NULL) {
  97                 ret = -ENODEV;
  98                 goto put_dev;
  99         }
 100
 101         llcp_sock->dev = dev;
 102         llcp_sock->local = nfc_llcp_local_get(local);
 103         llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
 104         llcp_sock->service_name_len = min_t(unsigned int,
 105                                             llcp_addr.service_name_len,
 106                                             NFC_LLCP_MAX_SERVICE_NAME);
 107         llcp_sock->service_name = kmemdup(llcp_addr.service_name,
 108                                           llcp_sock->service_name_len,
 109                                           GFP_KERNEL);
 110         if (!llcp_sock->service_name) {
 111                 ret = -ENOMEM;
 112                 goto put_dev;
 113         }
 114         llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
 115         if (llcp_sock->ssap == LLCP_SAP_MAX) {
 116                 kfree(llcp_sock->service_name);
 117                 llcp_sock->service_name = NULL;
 118                 ret = -EADDRINUSE;
 119                 goto put_dev;
 120         }
 121
 122         llcp_sock->reserved_ssap = llcp_sock->ssap;
 123
 124         nfc_llcp_sock_link(&local->sockets, sk);
 125
 126         pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
 127
 128         sk->sk_state = LLCP_BOUND;
 129
 130 put_dev:
 131         nfc_put_device(dev);
 132
 133 error:
 134         release_sock(sk);
 135         return ret;
 136 }
 137
 138 static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
 139                               int alen)
 140 {
 141         struct sock *sk = sock->sk;
 142         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 143         struct nfc_llcp_local *local;
 144         struct nfc_dev *dev;
 145         struct sockaddr_nfc_llcp llcp_addr;
 146         int len, ret = 0;
 147
 148         if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
 149             addr->sa_family != AF_NFC)
 150                 return -EINVAL;
 151
 152         pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
 153
 154         memset(&llcp_addr, 0, sizeof(llcp_addr));
 155         len = min_t(unsigned int, sizeof(llcp_addr), alen);
 156         memcpy(&llcp_addr, addr, len);
 157
 158         lock_sock(sk);
 159
 160         if (sk->sk_state != LLCP_CLOSED) {
 161                 ret = -EBADFD;
 162                 goto error;
 163         }
 164
 165         dev = nfc_get_device(llcp_addr.dev_idx);
 166         if (dev == NULL) {
 167                 ret = -ENODEV;
 168                 goto error;
 169         }
 170
 171         local = nfc_llcp_find_local(dev);
 172         if (local == NULL) {
 173                 ret = -ENODEV;
 174                 goto put_dev;
 175         }
 176
 177         llcp_sock->dev = dev;
 178         llcp_sock->local = nfc_llcp_local_get(local);
 179         llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
 180
 181         nfc_llcp_sock_link(&local->raw_sockets, sk);
 182
 183         sk->sk_state = LLCP_BOUND;
 184
 185 put_dev:
 186         nfc_put_device(dev);
 187
 188 error:
 189         release_sock(sk);
 190         return ret;
 191 }
 192
 193 static int llcp_sock_listen(struct socket *sock, int backlog)
 194 {
 195         struct sock *sk = sock->sk;
 196         int ret = 0;
 197
 198         pr_debug("sk %p backlog %d\n", sk, backlog);
 199
 200         lock_sock(sk);
 201
 202         if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
 203             sk->sk_state != LLCP_BOUND) {
 204                 ret = -EBADFD;
 205                 goto error;
 206         }
 207
 208         sk->sk_max_ack_backlog = backlog;
 209         sk->sk_ack_backlog = 0;
 210
 211         pr_debug("Socket listening\n");
 212         sk->sk_state = LLCP_LISTEN;
 213
 214 error:
 215         release_sock(sk);
 216
 217         return ret;
 218 }
 219
 220 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
 221                                sockptr_t optval, unsigned int optlen)
 222 {
 223         struct sock *sk = sock->sk;
 224         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 225         u32 opt;
 226         int err = 0;
 227
 228         pr_debug("%p optname %d\n", sk, optname);
 229
 230         if (level != SOL_NFC)
 231                 return -ENOPROTOOPT;
 232
 233         lock_sock(sk);
 234
 235         switch (optname) {
 236         case NFC_LLCP_RW:
 237                 if (sk->sk_state == LLCP_CONNECTED ||
 238                     sk->sk_state == LLCP_BOUND ||
 239                     sk->sk_state == LLCP_LISTEN) {
 240                         err = -EINVAL;
 241                         break;
 242                 }
 243
 244                 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 245                         err = -EFAULT;
 246                         break;
 247                 }
 248
 249                 if (opt > LLCP_MAX_RW) {
 250                         err = -EINVAL;
 251                         break;
 252                 }
 253
 254                 llcp_sock->rw = (u8) opt;
 255
 256                 break;
 257
 258         case NFC_LLCP_MIUX:
 259                 if (sk->sk_state == LLCP_CONNECTED ||
 260                     sk->sk_state == LLCP_BOUND ||
 261                     sk->sk_state == LLCP_LISTEN) {
 262                         err = -EINVAL;
 263                         break;
 264                 }
 265
 266                 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
 267                         err = -EFAULT;
 268                         break;
 269                 }
 270
 271                 if (opt > LLCP_MAX_MIUX) {
 272                         err = -EINVAL;
 273                         break;
 274                 }
 275
 276                 llcp_sock->miux = cpu_to_be16((u16) opt);
 277
 278                 break;
 279
 280         default:
 281                 err = -ENOPROTOOPT;
 282                 break;
 283         }
 284
 285         release_sock(sk);
 286
 287         pr_debug("%p rw %d miux %d\n", llcp_sock,
 288                  llcp_sock->rw, llcp_sock->miux);
 289
 290         return err;
 291 }
 292
 293 static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
 294                                char __user *optval, int __user *optlen)
 295 {
 296         struct nfc_llcp_local *local;
 297         struct sock *sk = sock->sk;
 298         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 299         int len, err = 0;
 300         u16 miux, remote_miu;
 301         u8 rw;
 302
 303         pr_debug("%p optname %d\n", sk, optname);
 304
 305         if (level != SOL_NFC)
 306                 return -ENOPROTOOPT;
 307
 308         if (get_user(len, optlen))
 309                 return -EFAULT;
 310
 311         local = llcp_sock->local;
 312         if (!local)
 313                 return -ENODEV;
 314
 315         len = min_t(u32, len, sizeof(u32));
 316
 317         lock_sock(sk);
 318
 319         switch (optname) {
 320         case NFC_LLCP_RW:
 321                 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
 322                 if (put_user(rw, (u32 __user *) optval))
 323                         err = -EFAULT;
 324
 325                 break;
 326
 327         case NFC_LLCP_MIUX:
 328                 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
 329                         be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
 330
 331                 if (put_user(miux, (u32 __user *) optval))
 332                         err = -EFAULT;
 333
 334                 break;
 335
 336         case NFC_LLCP_REMOTE_MIU:
 337                 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
 338                                 local->remote_miu : llcp_sock->remote_miu;
 339
 340                 if (put_user(remote_miu, (u32 __user *) optval))
 341                         err = -EFAULT;
 342
 343                 break;
 344
 345         case NFC_LLCP_REMOTE_LTO:
 346                 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
 347                         err = -EFAULT;
 348
 349                 break;
 350
 351         case NFC_LLCP_REMOTE_RW:
 352                 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
 353                         err = -EFAULT;
 354
 355                 break;
 356
 357         default:
 358                 err = -ENOPROTOOPT;
 359                 break;
 360         }
 361
 362         release_sock(sk);
 363
 364         if (put_user(len, optlen))
 365                 return -EFAULT;
 366
 367         return err;
 368 }
 369
 370 void nfc_llcp_accept_unlink(struct sock *sk)
 371 {
 372         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 373
 374         pr_debug("state %d\n", sk->sk_state);
 375
 376         list_del_init(&llcp_sock->accept_queue);
 377         sk_acceptq_removed(llcp_sock->parent);
 378         llcp_sock->parent = NULL;
 379
 380         sock_put(sk);
 381 }
 382
 383 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
 384 {
 385         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 386         struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
 387
 388         /* Lock will be free from unlink */
 389         sock_hold(sk);
 390
 391         list_add_tail(&llcp_sock->accept_queue,
 392                       &llcp_sock_parent->accept_queue);
 393         llcp_sock->parent = parent;
 394         sk_acceptq_added(parent);
 395 }
 396
 397 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
 398                                      struct socket *newsock)
 399 {
 400         struct nfc_llcp_sock *lsk, *n, *llcp_parent;
 401         struct sock *sk;
 402
 403         llcp_parent = nfc_llcp_sock(parent);
 404
 405         list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
 406                                  accept_queue) {
 407                 sk = &lsk->sk;
 408                 lock_sock(sk);
 409
 410                 if (sk->sk_state == LLCP_CLOSED) {
 411                         release_sock(sk);
 412                         nfc_llcp_accept_unlink(sk);
 413                         continue;
 414                 }
 415
 416                 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
 417                         list_del_init(&lsk->accept_queue);
 418                         sock_put(sk);
 419
 420                         if (newsock)
 421                                 sock_graft(sk, newsock);
 422
 423                         release_sock(sk);
 424
 425                         pr_debug("Returning sk state %d\n", sk->sk_state);
 426
 427                         sk_acceptq_removed(parent);
 428
 429                         return sk;
 430                 }
 431
 432                 release_sock(sk);
 433         }
 434
 435         return NULL;
 436 }
 437
 438 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
 439                             int flags, bool kern)
 440 {
 441         DECLARE_WAITQUEUE(wait, current);
 442         struct sock *sk = sock->sk, *new_sk;
 443         long timeo;
 444         int ret = 0;
 445
 446         pr_debug("parent %p\n", sk);
 447
 448         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 449
 450         if (sk->sk_state != LLCP_LISTEN) {
 451                 ret = -EBADFD;
 452                 goto error;
 453         }
 454
 455         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 456
 457         /* Wait for an incoming connection. */
 458         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 459         while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
 460                 set_current_state(TASK_INTERRUPTIBLE);
 461
 462                 if (!timeo) {
 463                         ret = -EAGAIN;
 464                         break;
 465                 }
 466
 467                 if (signal_pending(current)) {
 468                         ret = sock_intr_errno(timeo);
 469                         break;
 470                 }
 471
 472                 release_sock(sk);
 473                 timeo = schedule_timeout(timeo);
 474                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 475         }
 476         __set_current_state(TASK_RUNNING);
 477         remove_wait_queue(sk_sleep(sk), &wait);
 478
 479         if (ret)
 480                 goto error;
 481
 482         newsock->state = SS_CONNECTED;
 483
 484         pr_debug("new socket %p\n", new_sk);
 485
 486 error:
 487         release_sock(sk);
 488
 489         return ret;
 490 }
 491
 492 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
 493                              int peer)
 494 {
 495         struct sock *sk = sock->sk;
 496         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 497         DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
 498
 499         if (llcp_sock == NULL || llcp_sock->dev == NULL)
 500                 return -EBADFD;
 501
 502         pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
 503                  llcp_sock->dsap, llcp_sock->ssap);
 504
 505         memset(llcp_addr, 0, sizeof(*llcp_addr));
 506
 507         lock_sock(sk);
 508         if (!llcp_sock->dev) {
 509                 release_sock(sk);
 510                 return -EBADFD;
 511         }
 512         llcp_addr->sa_family = AF_NFC;
 513         llcp_addr->dev_idx = llcp_sock->dev->idx;
 514         llcp_addr->target_idx = llcp_sock->target_idx;
 515         llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
 516         llcp_addr->dsap = llcp_sock->dsap;
 517         llcp_addr->ssap = llcp_sock->ssap;
 518         llcp_addr->service_name_len = llcp_sock->service_name_len;
 519         memcpy(llcp_addr->service_name, llcp_sock->service_name,
 520                llcp_addr->service_name_len);
 521         release_sock(sk);
 522
 523         return sizeof(struct sockaddr_nfc_llcp);
 524 }
 525
 526 static inline __poll_t llcp_accept_poll(struct sock *parent)
 527 {
 528         struct nfc_llcp_sock *llcp_sock, *parent_sock;
 529         struct sock *sk;
 530
 531         parent_sock = nfc_llcp_sock(parent);
 532
 533         list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
 534                             accept_queue) {
 535                 sk = &llcp_sock->sk;
 536
 537                 if (sk->sk_state == LLCP_CONNECTED)
 538                         return EPOLLIN | EPOLLRDNORM;
 539         }
 540
 541         return 0;
 542 }
 543
 544 static __poll_t llcp_sock_poll(struct file *file, struct socket *sock,
 545                                    poll_table *wait)
 546 {
 547         struct sock *sk = sock->sk;
 548         __poll_t mask = 0;
 549
 550         pr_debug("%p\n", sk);
 551
 552         sock_poll_wait(file, sock, wait);
 553
 554         if (sk->sk_state == LLCP_LISTEN)
 555                 return llcp_accept_poll(sk);
 556
 557         if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
 558                 mask |= EPOLLERR |
 559                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
 560
 561         if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
 562                 mask |= EPOLLIN | EPOLLRDNORM;
 563
 564         if (sk->sk_state == LLCP_CLOSED)
 565                 mask |= EPOLLHUP;
 566
 567         if (sk->sk_shutdown & RCV_SHUTDOWN)
 568                 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
 569
 570         if (sk->sk_shutdown == SHUTDOWN_MASK)
 571                 mask |= EPOLLHUP;
 572
 573         if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
 574                 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
 575         else
 576                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
 577
 578         pr_debug("mask 0x%x\n", mask);
 579
 580         return mask;
 581 }
 582
 583 static int llcp_sock_release(struct socket *sock)
 584 {
 585         struct sock *sk = sock->sk;
 586         struct nfc_llcp_local *local;
 587         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 588         int err = 0;
 589
 590         if (!sk)
 591                 return 0;
 592
 593         pr_debug("%p\n", sk);
 594
 595         local = llcp_sock->local;
 596         if (local == NULL) {
 597                 err = -ENODEV;
 598                 goto out;
 599         }
 600
 601         lock_sock(sk);
 602
 603         /* Send a DISC */
 604         if (sk->sk_state == LLCP_CONNECTED)
 605                 nfc_llcp_send_disconnect(llcp_sock);
 606
 607         if (sk->sk_state == LLCP_LISTEN) {
 608                 struct nfc_llcp_sock *lsk, *n;
 609                 struct sock *accept_sk;
 610
 611                 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
 612                                          accept_queue) {
 613                         accept_sk = &lsk->sk;
 614                         lock_sock(accept_sk);
 615
 616                         nfc_llcp_send_disconnect(lsk);
 617                         nfc_llcp_accept_unlink(accept_sk);
 618
 619                         release_sock(accept_sk);
 620                 }
 621         }
 622
 623         if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
 624                 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
 625
 626         release_sock(sk);
 627
 628         /* Keep this sock alive and therefore do not remove it from the sockets
 629          * list until the DISC PDU has been actually sent. Otherwise we would
 630          * reply with DM PDUs before sending the DISC one.
 631          */
 632         if (sk->sk_state == LLCP_DISCONNECTING)
 633                 return err;
 634
 635         if (sock->type == SOCK_RAW)
 636                 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
 637         else
 638                 nfc_llcp_sock_unlink(&local->sockets, sk);
 639
 640 out:
 641         sock_orphan(sk);
 642         sock_put(sk);
 643
 644         return err;
 645 }
 646
 647 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
 648                              int len, int flags)
 649 {
 650         struct sock *sk = sock->sk;
 651         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 652         struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
 653         struct nfc_dev *dev;
 654         struct nfc_llcp_local *local;
 655         int ret = 0;
 656
 657         pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
 658
 659         if (!addr || len < sizeof(*addr) || addr->sa_family != AF_NFC)
 660                 return -EINVAL;
 661
 662         if (addr->service_name_len == 0 && addr->dsap == 0)
 663                 return -EINVAL;
 664
 665         pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
 666                  addr->target_idx, addr->nfc_protocol);
 667
 668         lock_sock(sk);
 669
 670         if (sk->sk_state == LLCP_CONNECTED) {
 671                 ret = -EISCONN;
 672                 goto error;
 673         }
 674
 675         dev = nfc_get_device(addr->dev_idx);
 676         if (dev == NULL) {
 677                 ret = -ENODEV;
 678                 goto error;
 679         }
 680
 681         local = nfc_llcp_find_local(dev);
 682         if (local == NULL) {
 683                 ret = -ENODEV;
 684                 goto put_dev;
 685         }
 686
 687         device_lock(&dev->dev);
 688         if (dev->dep_link_up == false) {
 689                 ret = -ENOLINK;
 690                 device_unlock(&dev->dev);
 691                 goto put_dev;
 692         }
 693         device_unlock(&dev->dev);
 694
 695         if (local->rf_mode == NFC_RF_INITIATOR &&
 696             addr->target_idx != local->target_idx) {
 697                 ret = -ENOLINK;
 698                 goto put_dev;
 699         }
 700
 701         llcp_sock->dev = dev;
 702         llcp_sock->local = nfc_llcp_local_get(local);
 703         llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
 704         if (llcp_sock->ssap == LLCP_SAP_MAX) {
 705                 ret = -ENOMEM;
 706                 goto put_dev;
 707         }
 708
 709         llcp_sock->reserved_ssap = llcp_sock->ssap;
 710
 711         if (addr->service_name_len == 0)
 712                 llcp_sock->dsap = addr->dsap;
 713         else
 714                 llcp_sock->dsap = LLCP_SAP_SDP;
 715         llcp_sock->nfc_protocol = addr->nfc_protocol;
 716         llcp_sock->service_name_len = min_t(unsigned int,
 717                                             addr->service_name_len,
 718                                             NFC_LLCP_MAX_SERVICE_NAME);
 719         llcp_sock->service_name = kmemdup(addr->service_name,
 720                                           llcp_sock->service_name_len,
 721                                           GFP_KERNEL);
 722         if (!llcp_sock->service_name) {
 723                 ret = -ENOMEM;
 724                 goto sock_llcp_release;
 725         }
 726
 727         nfc_llcp_sock_link(&local->connecting_sockets, sk);
 728
 729         ret = nfc_llcp_send_connect(llcp_sock);
 730         if (ret)
 731                 goto sock_unlink;
 732
 733         sk->sk_state = LLCP_CONNECTING;
 734
 735         ret = sock_wait_state(sk, LLCP_CONNECTED,
 736                               sock_sndtimeo(sk, flags & O_NONBLOCK));
 737         if (ret && ret != -EINPROGRESS)
 738                 goto sock_unlink;
 739
 740         release_sock(sk);
 741
 742         return ret;
 743
 744 sock_unlink:
 745         nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
 746
 747 sock_llcp_release:
 748         nfc_llcp_put_ssap(local, llcp_sock->ssap);
 749
 750 put_dev:
 751         nfc_put_device(dev);
 752
 753 error:
 754         release_sock(sk);
 755         return ret;
 756 }
 757
 758 static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 759                              size_t len)
 760 {
 761         struct sock *sk = sock->sk;
 762         struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
 763         int ret;
 764
 765         pr_debug("sock %p sk %p", sock, sk);
 766
 767         ret = sock_error(sk);
 768         if (ret)
 769                 return ret;
 770
 771         if (msg->msg_flags & MSG_OOB)
 772                 return -EOPNOTSUPP;
 773
 774         lock_sock(sk);
 775
 776         if (sk->sk_type == SOCK_DGRAM) {
 777                 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
 778                                  msg->msg_name);
 779
 780                 if (msg->msg_namelen < sizeof(*addr)) {
 781                         release_sock(sk);
 782                         return -EINVAL;
 783                 }
 784
 785                 release_sock(sk);
 786
 787                 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
 788                                               msg, len);
 789         }
 790
 791         if (sk->sk_state != LLCP_CONNECTED) {
 792                 release_sock(sk);
 793                 return -ENOTCONN;
 794         }
 795
 796         release_sock(sk);
 797
 798         return nfc_llcp_send_i_frame(llcp_sock, msg, len);
 799 }
 800
 801 static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
 802                              size_t len, int flags)
 803 {
 804         int noblock = flags & MSG_DONTWAIT;
 805         struct sock *sk = sock->sk;
 806         unsigned int copied, rlen;
 807         struct sk_buff *skb, *cskb;
 808         int err = 0;
 809
 810         pr_debug("%p %zu\n", sk, len);
 811
 812         lock_sock(sk);
 813
 814         if (sk->sk_state == LLCP_CLOSED &&
 815             skb_queue_empty(&sk->sk_receive_queue)) {
 816                 release_sock(sk);
 817                 return 0;
 818         }
 819
 820         release_sock(sk);
 821
 822         if (flags & (MSG_OOB))
 823                 return -EOPNOTSUPP;
 824
 825         skb = skb_recv_datagram(sk, flags, noblock, &err);
 826         if (!skb) {
 827                 pr_err("Recv datagram failed state %d %d %d",
 828                        sk->sk_state, err, sock_error(sk));
 829
 830                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 831                         return 0;
 832
 833                 return err;
 834         }
 835
 836         rlen = skb->len;                /* real length of skb */
 837         copied = min_t(unsigned int, rlen, len);
 838
 839         cskb = skb;
 840         if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
 841                 if (!(flags & MSG_PEEK))
 842                         skb_queue_head(&sk->sk_receive_queue, skb);
 843                 return -EFAULT;
 844         }
 845
 846         sock_recv_timestamp(msg, sk, skb);
 847
 848         if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
 849                 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
 850                 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
 851                                  msg->msg_name);
 852
 853                 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
 854
 855                 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
 856
 857                 memset(sockaddr, 0, sizeof(*sockaddr));
 858                 sockaddr->sa_family = AF_NFC;
 859                 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
 860                 sockaddr->dsap = ui_cb->dsap;
 861                 sockaddr->ssap = ui_cb->ssap;
 862         }
 863
 864         /* Mark read part of skb as used */
 865         if (!(flags & MSG_PEEK)) {
 866
 867                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
 868                 if (sk->sk_type == SOCK_STREAM ||
 869                     sk->sk_type == SOCK_DGRAM ||
 870                     sk->sk_type == SOCK_RAW) {
 871                         skb_pull(skb, copied);
 872                         if (skb->len) {
 873                                 skb_queue_head(&sk->sk_receive_queue, skb);
 874                                 goto done;
 875                         }
 876                 }
 877
 878                 kfree_skb(skb);
 879         }
 880
 881         /* XXX Queue backlogged skbs */
 882
 883 done:
 884         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
 885         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
 886                 copied = rlen;
 887
 888         return copied;
 889 }
 890
 891 static const struct proto_ops llcp_sock_ops = {
 892         .family         = PF_NFC,
 893         .owner          = THIS_MODULE,
 894         .bind           = llcp_sock_bind,
 895         .connect        = llcp_sock_connect,
 896         .release        = llcp_sock_release,
 897         .socketpair     = sock_no_socketpair,
 898         .accept         = llcp_sock_accept,
 899         .getname        = llcp_sock_getname,
 900         .poll           = llcp_sock_poll,
 901         .ioctl          = sock_no_ioctl,
 902         .listen         = llcp_sock_listen,
 903         .shutdown       = sock_no_shutdown,
 904         .setsockopt     = nfc_llcp_setsockopt,
 905         .getsockopt     = nfc_llcp_getsockopt,
 906         .sendmsg        = llcp_sock_sendmsg,
 907         .recvmsg        = llcp_sock_recvmsg,
 908         .mmap           = sock_no_mmap,
 909 };
 910
 911 static const struct proto_ops llcp_rawsock_ops = {
 912         .family         = PF_NFC,
 913         .owner          = THIS_MODULE,
 914         .bind           = llcp_raw_sock_bind,
 915         .connect        = sock_no_connect,
 916         .release        = llcp_sock_release,
 917         .socketpair     = sock_no_socketpair,
 918         .accept         = sock_no_accept,
 919         .getname        = llcp_sock_getname,
 920         .poll           = llcp_sock_poll,
 921         .ioctl          = sock_no_ioctl,
 922         .listen         = sock_no_listen,
 923         .shutdown       = sock_no_shutdown,
 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, int kern)
 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, kern);
 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, int kern)
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                 if (!capable(CAP_NET_RAW))
1012                         return -EPERM;
1013                 sock->ops = &llcp_rawsock_ops;
1014         } else {
1015                 sock->ops = &llcp_sock_ops;
1016         }
1017
1018         sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
1019         if (sk == NULL)
1020                 return -ENOMEM;
1021
1022         return 0;
1023 }
1024
1025 static const struct nfc_protocol llcp_nfc_proto = {
1026         .id       = NFC_SOCKPROTO_LLCP,
1027         .proto    = &llcp_sock_proto,
1028         .owner    = THIS_MODULE,
1029         .create   = llcp_sock_create
1030 };
1031
1032 int __init nfc_llcp_sock_init(void)
1033 {
1034         return nfc_proto_register(&llcp_nfc_proto);
1035 }
1036
1037 void nfc_llcp_sock_exit(void)
1038 {
1039         nfc_proto_unregister(&llcp_nfc_proto);
1040 }