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