net/can/raw.c

   1 /*
   2  * raw.c - Raw sockets for protocol family CAN
   3  *
   4  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of Volkswagen nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * Alternatively, provided that this notice is retained in full, this
  20  * software may be distributed under the terms of the GNU General
  21  * Public License ("GPL") version 2, in which case the provisions of the
  22  * GPL apply INSTEAD OF those given above.
  23  *
  24  * The provided data structures and external interfaces from this code
  25  * are not restricted to be used by modules with a GPL compatible license.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  30  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  31  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  32  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  33  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  34  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  35  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  37  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  38  * DAMAGE.
  39  *
  40  * Send feedback to <socketcan-users@lists.berlios.de>
  41  *
  42  */
  43
  44 #include <linux/module.h>
  45 #include <linux/init.h>
  46 #include <linux/uio.h>
  47 #include <linux/net.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/socket.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/skbuff.h>
  52 #include <linux/can.h>
  53 #include <linux/can/core.h>
  54 #include <linux/can/raw.h>
  55 #include <net/sock.h>
  56 #include <net/net_namespace.h>
  57
  58 #define CAN_RAW_VERSION CAN_VERSION
  59 static __initdata const char banner[] =
  60         KERN_INFO "can: raw protocol (rev " CAN_RAW_VERSION ")\n";
  61
  62 MODULE_DESCRIPTION("PF_CAN raw protocol");
  63 MODULE_LICENSE("Dual BSD/GPL");
  64 MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
  65
  66 #define MASK_ALL 0
  67
  68 /*
  69  * A raw socket has a list of can_filters attached to it, each receiving
  70  * the CAN frames matching that filter.  If the filter list is empty,
  71  * no CAN frames will be received by the socket.  The default after
  72  * opening the socket, is to have one filter which receives all frames.
  73  * The filter list is allocated dynamically with the exception of the
  74  * list containing only one item.  This common case is optimized by
  75  * storing the single filter in dfilter, to avoid using dynamic memory.
  76  */
  77
  78 struct raw_sock {
  79         struct sock sk;
  80         int bound;
  81         int ifindex;
  82         struct notifier_block notifier;
  83         int loopback;
  84         int recv_own_msgs;
  85         int count;                 /* number of active filters */
  86         struct can_filter dfilter; /* default/single filter */
  87         struct can_filter *filter; /* pointer to filter(s) */
  88         can_err_mask_t err_mask;
  89 };
  90
  91 static inline struct raw_sock *raw_sk(const struct sock *sk)
  92 {
  93         return (struct raw_sock *)sk;
  94 }
  95
  96 static void raw_rcv(struct sk_buff *skb, void *data)
  97 {
  98         struct sock *sk = (struct sock *)data;
  99         struct raw_sock *ro = raw_sk(sk);
 100         struct sockaddr_can *addr;
 101
 102         /* check the received tx sock reference */
 103         if (!ro->recv_own_msgs && skb->sk == sk)
 104                 return;
 105
 106         /* clone the given skb to be able to enqueue it into the rcv queue */
 107         skb = skb_clone(skb, GFP_ATOMIC);
 108         if (!skb)
 109                 return;
 110
 111         /*
 112          *  Put the datagram to the queue so that raw_recvmsg() can
 113          *  get it from there.  We need to pass the interface index to
 114          *  raw_recvmsg().  We pass a whole struct sockaddr_can in skb->cb
 115          *  containing the interface index.
 116          */
 117
 118         BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
 119         addr = (struct sockaddr_can *)skb->cb;
 120         memset(addr, 0, sizeof(*addr));
 121         addr->can_family  = AF_CAN;
 122         addr->can_ifindex = skb->dev->ifindex;
 123
 124         if (sock_queue_rcv_skb(sk, skb) < 0)
 125                 kfree_skb(skb);
 126 }
 127
 128 static int raw_enable_filters(struct net_device *dev, struct sock *sk,
 129                               struct can_filter *filter, int count)
 130 {
 131         int err = 0;
 132         int i;
 133
 134         for (i = 0; i < count; i++) {
 135                 err = can_rx_register(dev, filter[i].can_id,
 136                                       filter[i].can_mask,
 137                                       raw_rcv, sk, "raw");
 138                 if (err) {
 139                         /* clean up successfully registered filters */
 140                         while (--i >= 0)
 141                                 can_rx_unregister(dev, filter[i].can_id,
 142                                                   filter[i].can_mask,
 143                                                   raw_rcv, sk);
 144                         break;
 145                 }
 146         }
 147
 148         return err;
 149 }
 150
 151 static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
 152                                 can_err_mask_t err_mask)
 153 {
 154         int err = 0;
 155
 156         if (err_mask)
 157                 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
 158                                       raw_rcv, sk, "raw");
 159
 160         return err;
 161 }
 162
 163 static void raw_disable_filters(struct net_device *dev, struct sock *sk,
 164                               struct can_filter *filter, int count)
 165 {
 166         int i;
 167
 168         for (i = 0; i < count; i++)
 169                 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
 170                                   raw_rcv, sk);
 171 }
 172
 173 static inline void raw_disable_errfilter(struct net_device *dev,
 174                                          struct sock *sk,
 175                                          can_err_mask_t err_mask)
 176
 177 {
 178         if (err_mask)
 179                 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
 180                                   raw_rcv, sk);
 181 }
 182
 183 static inline void raw_disable_allfilters(struct net_device *dev,
 184                                           struct sock *sk)
 185 {
 186         struct raw_sock *ro = raw_sk(sk);
 187
 188         raw_disable_filters(dev, sk, ro->filter, ro->count);
 189         raw_disable_errfilter(dev, sk, ro->err_mask);
 190 }
 191
 192 static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
 193 {
 194         struct raw_sock *ro = raw_sk(sk);
 195         int err;
 196
 197         err = raw_enable_filters(dev, sk, ro->filter, ro->count);
 198         if (!err) {
 199                 err = raw_enable_errfilter(dev, sk, ro->err_mask);
 200                 if (err)
 201                         raw_disable_filters(dev, sk, ro->filter, ro->count);
 202         }
 203
 204         return err;
 205 }
 206
 207 static int raw_notifier(struct notifier_block *nb,
 208                         unsigned long msg, void *data)
 209 {
 210         struct net_device *dev = (struct net_device *)data;
 211         struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
 212         struct sock *sk = &ro->sk;
 213
 214         if (!net_eq(dev_net(dev), &init_net))
 215                 return NOTIFY_DONE;
 216
 217         if (dev->type != ARPHRD_CAN)
 218                 return NOTIFY_DONE;
 219
 220         if (ro->ifindex != dev->ifindex)
 221                 return NOTIFY_DONE;
 222
 223         switch (msg) {
 224
 225         case NETDEV_UNREGISTER:
 226                 lock_sock(sk);
 227                 /* remove current filters & unregister */
 228                 if (ro->bound)
 229                         raw_disable_allfilters(dev, sk);
 230
 231                 if (ro->count > 1)
 232                         kfree(ro->filter);
 233
 234                 ro->ifindex = 0;
 235                 ro->bound   = 0;
 236                 ro->count   = 0;
 237                 release_sock(sk);
 238
 239                 sk->sk_err = ENODEV;
 240                 if (!sock_flag(sk, SOCK_DEAD))
 241                         sk->sk_error_report(sk);
 242                 break;
 243
 244         case NETDEV_DOWN:
 245                 sk->sk_err = ENETDOWN;
 246                 if (!sock_flag(sk, SOCK_DEAD))
 247                         sk->sk_error_report(sk);
 248                 break;
 249         }
 250
 251         return NOTIFY_DONE;
 252 }
 253
 254 static int raw_init(struct sock *sk)
 255 {
 256         struct raw_sock *ro = raw_sk(sk);
 257
 258         ro->bound            = 0;
 259         ro->ifindex          = 0;
 260
 261         /* set default filter to single entry dfilter */
 262         ro->dfilter.can_id   = 0;
 263         ro->dfilter.can_mask = MASK_ALL;
 264         ro->filter           = &ro->dfilter;
 265         ro->count            = 1;
 266
 267         /* set default loopback behaviour */
 268         ro->loopback         = 1;
 269         ro->recv_own_msgs    = 0;
 270
 271         /* set notifier */
 272         ro->notifier.notifier_call = raw_notifier;
 273
 274         register_netdevice_notifier(&ro->notifier);
 275
 276         return 0;
 277 }
 278
 279 static int raw_release(struct socket *sock)
 280 {
 281         struct sock *sk = sock->sk;
 282         struct raw_sock *ro = raw_sk(sk);
 283
 284         unregister_netdevice_notifier(&ro->notifier);
 285
 286         lock_sock(sk);
 287
 288         /* remove current filters & unregister */
 289         if (ro->bound) {
 290                 if (ro->ifindex) {
 291                         struct net_device *dev;
 292
 293                         dev = dev_get_by_index(&init_net, ro->ifindex);
 294                         if (dev) {
 295                                 raw_disable_allfilters(dev, sk);
 296                                 dev_put(dev);
 297                         }
 298                 } else
 299                         raw_disable_allfilters(NULL, sk);
 300         }
 301
 302         if (ro->count > 1)
 303                 kfree(ro->filter);
 304
 305         ro->ifindex = 0;
 306         ro->bound   = 0;
 307         ro->count   = 0;
 308
 309         release_sock(sk);
 310         sock_put(sk);
 311
 312         return 0;
 313 }
 314
 315 static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
 316 {
 317         struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
 318         struct sock *sk = sock->sk;
 319         struct raw_sock *ro = raw_sk(sk);
 320         int ifindex;
 321         int err = 0;
 322         int notify_enetdown = 0;
 323
 324         if (len < sizeof(*addr))
 325                 return -EINVAL;
 326
 327         lock_sock(sk);
 328
 329         if (ro->bound && addr->can_ifindex == ro->ifindex)
 330                 goto out;
 331
 332         if (addr->can_ifindex) {
 333                 struct net_device *dev;
 334
 335                 dev = dev_get_by_index(&init_net, addr->can_ifindex);
 336                 if (!dev) {
 337                         err = -ENODEV;
 338                         goto out;
 339                 }
 340                 if (dev->type != ARPHRD_CAN) {
 341                         dev_put(dev);
 342                         err = -ENODEV;
 343                         goto out;
 344                 }
 345                 if (!(dev->flags & IFF_UP))
 346                         notify_enetdown = 1;
 347
 348                 ifindex = dev->ifindex;
 349
 350                 /* filters set by default/setsockopt */
 351                 err = raw_enable_allfilters(dev, sk);
 352                 dev_put(dev);
 353         } else {
 354                 ifindex = 0;
 355
 356                 /* filters set by default/setsockopt */
 357                 err = raw_enable_allfilters(NULL, sk);
 358         }
 359
 360         if (!err) {
 361                 if (ro->bound) {
 362                         /* unregister old filters */
 363                         if (ro->ifindex) {
 364                                 struct net_device *dev;
 365
 366                                 dev = dev_get_by_index(&init_net, ro->ifindex);
 367                                 if (dev) {
 368                                         raw_disable_allfilters(dev, sk);
 369                                         dev_put(dev);
 370                                 }
 371                         } else
 372                                 raw_disable_allfilters(NULL, sk);
 373                 }
 374                 ro->ifindex = ifindex;
 375                 ro->bound = 1;
 376         }
 377
 378  out:
 379         release_sock(sk);
 380
 381         if (notify_enetdown) {
 382                 sk->sk_err = ENETDOWN;
 383                 if (!sock_flag(sk, SOCK_DEAD))
 384                         sk->sk_error_report(sk);
 385         }
 386
 387         return err;
 388 }
 389
 390 static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
 391                        int *len, int peer)
 392 {
 393         struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
 394         struct sock *sk = sock->sk;
 395         struct raw_sock *ro = raw_sk(sk);
 396
 397         if (peer)
 398                 return -EOPNOTSUPP;
 399
 400         addr->can_family  = AF_CAN;
 401         addr->can_ifindex = ro->ifindex;
 402
 403         *len = sizeof(*addr);
 404
 405         return 0;
 406 }
 407
 408 static int raw_setsockopt(struct socket *sock, int level, int optname,
 409                           char __user *optval, int optlen)
 410 {
 411         struct sock *sk = sock->sk;
 412         struct raw_sock *ro = raw_sk(sk);
 413         struct can_filter *filter = NULL;  /* dyn. alloc'ed filters */
 414         struct can_filter sfilter;         /* single filter */
 415         struct net_device *dev = NULL;
 416         can_err_mask_t err_mask = 0;
 417         int count = 0;
 418         int err = 0;
 419
 420         if (level != SOL_CAN_RAW)
 421                 return -EINVAL;
 422         if (optlen < 0)
 423                 return -EINVAL;
 424
 425         switch (optname) {
 426
 427         case CAN_RAW_FILTER:
 428                 if (optlen % sizeof(struct can_filter) != 0)
 429                         return -EINVAL;
 430
 431                 count = optlen / sizeof(struct can_filter);
 432
 433                 if (count > 1) {
 434                         /* filter does not fit into dfilter => alloc space */
 435                         filter = kmalloc(optlen, GFP_KERNEL);
 436                         if (!filter)
 437                                 return -ENOMEM;
 438
 439                         if (copy_from_user(filter, optval, optlen)) {
 440                                 kfree(filter);
 441                                 return -EFAULT;
 442                         }
 443                 } else if (count == 1) {
 444                         if (copy_from_user(&sfilter, optval, optlen))
 445                                 return -EFAULT;
 446                 }
 447
 448                 lock_sock(sk);
 449
 450                 if (ro->bound && ro->ifindex)
 451                         dev = dev_get_by_index(&init_net, ro->ifindex);
 452
 453                 if (ro->bound) {
 454                         /* (try to) register the new filters */
 455                         if (count == 1)
 456                                 err = raw_enable_filters(dev, sk, &sfilter, 1);
 457                         else
 458                                 err = raw_enable_filters(dev, sk, filter,
 459                                                          count);
 460                         if (err) {
 461                                 if (count > 1)
 462                                         kfree(filter);
 463                                 goto out_fil;
 464                         }
 465
 466                         /* remove old filter registrations */
 467                         raw_disable_filters(dev, sk, ro->filter, ro->count);
 468                 }
 469
 470                 /* remove old filter space */
 471                 if (ro->count > 1)
 472                         kfree(ro->filter);
 473
 474                 /* link new filters to the socket */
 475                 if (count == 1) {
 476                         /* copy filter data for single filter */
 477                         ro->dfilter = sfilter;
 478                         filter = &ro->dfilter;
 479                 }
 480                 ro->filter = filter;
 481                 ro->count  = count;
 482
 483  out_fil:
 484                 if (dev)
 485                         dev_put(dev);
 486
 487                 release_sock(sk);
 488
 489                 break;
 490
 491         case CAN_RAW_ERR_FILTER:
 492                 if (optlen != sizeof(err_mask))
 493                         return -EINVAL;
 494
 495                 if (copy_from_user(&err_mask, optval, optlen))
 496                         return -EFAULT;
 497
 498                 err_mask &= CAN_ERR_MASK;
 499
 500                 lock_sock(sk);
 501
 502                 if (ro->bound && ro->ifindex)
 503                         dev = dev_get_by_index(&init_net, ro->ifindex);
 504
 505                 /* remove current error mask */
 506                 if (ro->bound) {
 507                         /* (try to) register the new err_mask */
 508                         err = raw_enable_errfilter(dev, sk, err_mask);
 509
 510                         if (err)
 511                                 goto out_err;
 512
 513                         /* remove old err_mask registration */
 514                         raw_disable_errfilter(dev, sk, ro->err_mask);
 515                 }
 516
 517                 /* link new err_mask to the socket */
 518                 ro->err_mask = err_mask;
 519
 520  out_err:
 521                 if (dev)
 522                         dev_put(dev);
 523
 524                 release_sock(sk);
 525
 526                 break;
 527
 528         case CAN_RAW_LOOPBACK:
 529                 if (optlen != sizeof(ro->loopback))
 530                         return -EINVAL;
 531
 532                 if (copy_from_user(&ro->loopback, optval, optlen))
 533                         return -EFAULT;
 534
 535                 break;
 536
 537         case CAN_RAW_RECV_OWN_MSGS:
 538                 if (optlen != sizeof(ro->recv_own_msgs))
 539                         return -EINVAL;
 540
 541                 if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
 542                         return -EFAULT;
 543
 544                 break;
 545
 546         default:
 547                 return -ENOPROTOOPT;
 548         }
 549         return err;
 550 }
 551
 552 static int raw_getsockopt(struct socket *sock, int level, int optname,
 553                           char __user *optval, int __user *optlen)
 554 {
 555         struct sock *sk = sock->sk;
 556         struct raw_sock *ro = raw_sk(sk);
 557         int len;
 558         void *val;
 559         int err = 0;
 560
 561         if (level != SOL_CAN_RAW)
 562                 return -EINVAL;
 563         if (get_user(len, optlen))
 564                 return -EFAULT;
 565         if (len < 0)
 566                 return -EINVAL;
 567
 568         switch (optname) {
 569
 570         case CAN_RAW_FILTER:
 571                 lock_sock(sk);
 572                 if (ro->count > 0) {
 573                         int fsize = ro->count * sizeof(struct can_filter);
 574                         if (len > fsize)
 575                                 len = fsize;
 576                         if (copy_to_user(optval, ro->filter, len))
 577                                 err = -EFAULT;
 578                 } else
 579                         len = 0;
 580                 release_sock(sk);
 581
 582                 if (!err)
 583                         err = put_user(len, optlen);
 584                 return err;
 585
 586         case CAN_RAW_ERR_FILTER:
 587                 if (len > sizeof(can_err_mask_t))
 588                         len = sizeof(can_err_mask_t);
 589                 val = &ro->err_mask;
 590                 break;
 591
 592         case CAN_RAW_LOOPBACK:
 593                 if (len > sizeof(int))
 594                         len = sizeof(int);
 595                 val = &ro->loopback;
 596                 break;
 597
 598         case CAN_RAW_RECV_OWN_MSGS:
 599                 if (len > sizeof(int))
 600                         len = sizeof(int);
 601                 val = &ro->recv_own_msgs;
 602                 break;
 603
 604         default:
 605                 return -ENOPROTOOPT;
 606         }
 607
 608         if (put_user(len, optlen))
 609                 return -EFAULT;
 610         if (copy_to_user(optval, val, len))
 611                 return -EFAULT;
 612         return 0;
 613 }
 614
 615 static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
 616                        struct msghdr *msg, size_t size)
 617 {
 618         struct sock *sk = sock->sk;
 619         struct raw_sock *ro = raw_sk(sk);
 620         struct sk_buff *skb;
 621         struct net_device *dev;
 622         int ifindex;
 623         int err;
 624
 625         if (msg->msg_name) {
 626                 struct sockaddr_can *addr =
 627                         (struct sockaddr_can *)msg->msg_name;
 628
 629                 if (addr->can_family != AF_CAN)
 630                         return -EINVAL;
 631
 632                 ifindex = addr->can_ifindex;
 633         } else
 634                 ifindex = ro->ifindex;
 635
 636         if (size != sizeof(struct can_frame))
 637                 return -EINVAL;
 638
 639         dev = dev_get_by_index(&init_net, ifindex);
 640         if (!dev)
 641                 return -ENXIO;
 642
 643         skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
 644                                   &err);
 645         if (!skb)
 646                 goto put_dev;
 647
 648         err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
 649         if (err < 0)
 650                 goto free_skb;
 651         err = sock_tx_timestamp(msg, sk, skb_tx(skb));
 652         if (err < 0)
 653                 goto free_skb;
 654         skb->dev = dev;
 655         skb->sk  = sk;
 656
 657         err = can_send(skb, ro->loopback);
 658
 659         dev_put(dev);
 660
 661         if (err)
 662                 goto send_failed;
 663
 664         return size;
 665
 666 free_skb:
 667         kfree_skb(skb);
 668 put_dev:
 669         dev_put(dev);
 670 send_failed:
 671         return err;
 672 }
 673
 674 static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
 675                        struct msghdr *msg, size_t size, int flags)
 676 {
 677         struct sock *sk = sock->sk;
 678         struct sk_buff *skb;
 679         int err = 0;
 680         int noblock;
 681
 682         noblock =  flags & MSG_DONTWAIT;
 683         flags   &= ~MSG_DONTWAIT;
 684
 685         skb = skb_recv_datagram(sk, flags, noblock, &err);
 686         if (!skb)
 687                 return err;
 688
 689         if (size < skb->len)
 690                 msg->msg_flags |= MSG_TRUNC;
 691         else
 692                 size = skb->len;
 693
 694         err = memcpy_toiovec(msg->msg_iov, skb->data, size);
 695         if (err < 0) {
 696                 skb_free_datagram(sk, skb);
 697                 return err;
 698         }
 699
 700         sock_recv_timestamp(msg, sk, skb);
 701
 702         if (msg->msg_name) {
 703                 msg->msg_namelen = sizeof(struct sockaddr_can);
 704                 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
 705         }
 706
 707         skb_free_datagram(sk, skb);
 708
 709         return size;
 710 }
 711
 712 static struct proto_ops raw_ops __read_mostly = {
 713         .family        = PF_CAN,
 714         .release       = raw_release,
 715         .bind          = raw_bind,
 716         .connect       = sock_no_connect,
 717         .socketpair    = sock_no_socketpair,
 718         .accept        = sock_no_accept,
 719         .getname       = raw_getname,
 720         .poll          = datagram_poll,
 721         .ioctl         = NULL,          /* use can_ioctl() from af_can.c */
 722         .listen        = sock_no_listen,
 723         .shutdown      = sock_no_shutdown,
 724         .setsockopt    = raw_setsockopt,
 725         .getsockopt    = raw_getsockopt,
 726         .sendmsg       = raw_sendmsg,
 727         .recvmsg       = raw_recvmsg,
 728         .mmap          = sock_no_mmap,
 729         .sendpage      = sock_no_sendpage,
 730 };
 731
 732 static struct proto raw_proto __read_mostly = {
 733         .name       = "CAN_RAW",
 734         .owner      = THIS_MODULE,
 735         .obj_size   = sizeof(struct raw_sock),
 736         .init       = raw_init,
 737 };
 738
 739 static struct can_proto raw_can_proto __read_mostly = {
 740         .type       = SOCK_RAW,
 741         .protocol   = CAN_RAW,
 742         .capability = -1,
 743         .ops        = &raw_ops,
 744         .prot       = &raw_proto,
 745 };
 746
 747 static __init int raw_module_init(void)
 748 {
 749         int err;
 750
 751         printk(banner);
 752
 753         err = can_proto_register(&raw_can_proto);
 754         if (err < 0)
 755                 printk(KERN_ERR "can: registration of raw protocol failed\n");
 756
 757         return err;
 758 }
 759
 760 static __exit void raw_module_exit(void)
 761 {
 762         can_proto_unregister(&raw_can_proto);
 763 }
 764
 765 module_init(raw_module_init);
 766 module_exit(raw_module_exit);