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