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         if (!ro->recv_own_msgs) {
 103                 /* check the received tx sock reference */
 104                 if (skb->sk == sk) {
 105                         kfree_skb(skb);
 106                         return;
 107                 }
 108         }
 109
 110         /*
 111          *  Put the datagram to the queue so that raw_recvmsg() can
 112          *  get it from there.  We need to pass the interface index to
 113          *  raw_recvmsg().  We pass a whole struct sockaddr_can in skb->cb
 114          *  containing the interface index.
 115          */
 116
 117         BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
 118         addr = (struct sockaddr_can *)skb->cb;
 119         memset(addr, 0, sizeof(*addr));
 120         addr->can_family  = AF_CAN;
 121         addr->can_ifindex = skb->dev->ifindex;
 122
 123         if (sock_queue_rcv_skb(sk, skb) < 0)
 124                 kfree_skb(skb);
 125 }
 126
 127 static int raw_enable_filters(struct net_device *dev, struct sock *sk,
 128                               struct can_filter *filter, int count)
 129 {
 130         int err = 0;
 131         int i;
 132
 133         for (i = 0; i < count; i++) {
 134                 err = can_rx_register(dev, filter[i].can_id,
 135                                       filter[i].can_mask,
 136                                       raw_rcv, sk, "raw");
 137                 if (err) {
 138                         /* clean up successfully registered filters */
 139                         while (--i >= 0)
 140                                 can_rx_unregister(dev, filter[i].can_id,
 141                                                   filter[i].can_mask,
 142                                                   raw_rcv, sk);
 143                         break;
 144                 }
 145         }
 146
 147         return err;
 148 }
 149
 150 static int raw_enable_errfilter(struct net_device *dev, struct sock *sk,
 151                                 can_err_mask_t err_mask)
 152 {
 153         int err = 0;
 154
 155         if (err_mask)
 156                 err = can_rx_register(dev, 0, err_mask | CAN_ERR_FLAG,
 157                                       raw_rcv, sk, "raw");
 158
 159         return err;
 160 }
 161
 162 static void raw_disable_filters(struct net_device *dev, struct sock *sk,
 163                               struct can_filter *filter, int count)
 164 {
 165         int i;
 166
 167         for (i = 0; i < count; i++)
 168                 can_rx_unregister(dev, filter[i].can_id, filter[i].can_mask,
 169                                   raw_rcv, sk);
 170 }
 171
 172 static inline void raw_disable_errfilter(struct net_device *dev,
 173                                          struct sock *sk,
 174                                          can_err_mask_t err_mask)
 175
 176 {
 177         if (err_mask)
 178                 can_rx_unregister(dev, 0, err_mask | CAN_ERR_FLAG,
 179                                   raw_rcv, sk);
 180 }
 181
 182 static inline void raw_disable_allfilters(struct net_device *dev,
 183                                           struct sock *sk)
 184 {
 185         struct raw_sock *ro = raw_sk(sk);
 186
 187         raw_disable_filters(dev, sk, ro->filter, ro->count);
 188         raw_disable_errfilter(dev, sk, ro->err_mask);
 189 }
 190
 191 static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
 192 {
 193         struct raw_sock *ro = raw_sk(sk);
 194         int err;
 195
 196         err = raw_enable_filters(dev, sk, ro->filter, ro->count);
 197         if (!err) {
 198                 err = raw_enable_errfilter(dev, sk, ro->err_mask);
 199                 if (err)
 200                         raw_disable_filters(dev, sk, ro->filter, ro->count);
 201         }
 202
 203         return err;
 204 }
 205
 206 static int raw_notifier(struct notifier_block *nb,
 207                         unsigned long msg, void *data)
 208 {
 209         struct net_device *dev = (struct net_device *)data;
 210         struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
 211         struct sock *sk = &ro->sk;
 212
 213         if (dev->nd_net != &init_net)
 214                 return NOTIFY_DONE;
 215
 216         if (dev->type != ARPHRD_CAN)
 217                 return NOTIFY_DONE;
 218
 219         if (ro->ifindex != dev->ifindex)
 220                 return NOTIFY_DONE;
 221
 222         switch (msg) {
 223
 224         case NETDEV_UNREGISTER:
 225                 lock_sock(sk);
 226                 /* remove current filters & unregister */
 227                 if (ro->bound)
 228                         raw_disable_allfilters(dev, sk);
 229
 230                 if (ro->count > 1)
 231                         kfree(ro->filter);
 232
 233                 ro->ifindex = 0;
 234                 ro->bound   = 0;
 235                 ro->count   = 0;
 236                 release_sock(sk);
 237
 238                 sk->sk_err = ENODEV;
 239                 if (!sock_flag(sk, SOCK_DEAD))
 240                         sk->sk_error_report(sk);
 241                 break;
 242
 243         case NETDEV_DOWN:
 244                 sk->sk_err = ENETDOWN;
 245                 if (!sock_flag(sk, SOCK_DEAD))
 246                         sk->sk_error_report(sk);
 247                 break;
 248         }
 249
 250         return NOTIFY_DONE;
 251 }
 252
 253 static int raw_init(struct sock *sk)
 254 {
 255         struct raw_sock *ro = raw_sk(sk);
 256
 257         ro->bound            = 0;
 258         ro->ifindex          = 0;
 259
 260         /* set default filter to single entry dfilter */
 261         ro->dfilter.can_id   = 0;
 262         ro->dfilter.can_mask = MASK_ALL;
 263         ro->filter           = &ro->dfilter;
 264         ro->count            = 1;
 265
 266         /* set default loopback behaviour */
 267         ro->loopback         = 1;
 268         ro->recv_own_msgs    = 0;
 269
 270         /* set notifier */
 271         ro->notifier.notifier_call = raw_notifier;
 272
 273         register_netdevice_notifier(&ro->notifier);
 274
 275         return 0;
 276 }
 277
 278 static int raw_release(struct socket *sock)
 279 {
 280         struct sock *sk = sock->sk;
 281         struct raw_sock *ro = raw_sk(sk);
 282
 283         unregister_netdevice_notifier(&ro->notifier);
 284
 285         lock_sock(sk);
 286
 287         /* remove current filters & unregister */
 288         if (ro->bound) {
 289                 if (ro->ifindex) {
 290                         struct net_device *dev;
 291
 292                         dev = dev_get_by_index(&init_net, ro->ifindex);
 293                         if (dev) {
 294                                 raw_disable_allfilters(dev, sk);
 295                                 dev_put(dev);
 296                         }
 297                 } else
 298                         raw_disable_allfilters(NULL, sk);
 299         }
 300
 301         if (ro->count > 1)
 302                 kfree(ro->filter);
 303
 304         ro->ifindex = 0;
 305         ro->bound   = 0;
 306         ro->count   = 0;
 307
 308         release_sock(sk);
 309         sock_put(sk);
 310
 311         return 0;
 312 }
 313
 314 static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
 315 {
 316         struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
 317         struct sock *sk = sock->sk;
 318         struct raw_sock *ro = raw_sk(sk);
 319         int ifindex;
 320         int err = 0;
 321         int notify_enetdown = 0;
 322
 323         if (len < sizeof(*addr))
 324                 return -EINVAL;
 325
 326         lock_sock(sk);
 327
 328         if (ro->bound && addr->can_ifindex == ro->ifindex)
 329                 goto out;
 330
 331         if (addr->can_ifindex) {
 332                 struct net_device *dev;
 333
 334                 dev = dev_get_by_index(&init_net, addr->can_ifindex);
 335                 if (!dev) {
 336                         err = -ENODEV;
 337                         goto out;
 338                 }
 339                 if (dev->type != ARPHRD_CAN) {
 340                         dev_put(dev);
 341                         err = -ENODEV;
 342                         goto out;
 343                 }
 344                 if (!(dev->flags & IFF_UP))
 345                         notify_enetdown = 1;
 346
 347                 ifindex = dev->ifindex;
 348
 349                 /* filters set by default/setsockopt */
 350                 err = raw_enable_allfilters(dev, sk);
 351                 dev_put(dev);
 352         } else {
 353                 ifindex = 0;
 354
 355                 /* filters set by default/setsockopt */
 356                 err = raw_enable_allfilters(NULL, sk);
 357         }
 358
 359         if (!err) {
 360                 if (ro->bound) {
 361                         /* unregister old filters */
 362                         if (ro->ifindex) {
 363                                 struct net_device *dev;
 364
 365                                 dev = dev_get_by_index(&init_net, ro->ifindex);
 366                                 if (dev) {
 367                                         raw_disable_allfilters(dev, sk);
 368                                         dev_put(dev);
 369                                 }
 370                         } else
 371                                 raw_disable_allfilters(NULL, sk);
 372                 }
 373                 ro->ifindex = ifindex;
 374                 ro->bound = 1;
 375         }
 376
 377  out:
 378         release_sock(sk);
 379
 380         if (notify_enetdown) {
 381                 sk->sk_err = ENETDOWN;
 382                 if (!sock_flag(sk, SOCK_DEAD))
 383                         sk->sk_error_report(sk);
 384         }
 385
 386         return err;
 387 }
 388
 389 static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
 390                        int *len, int peer)
 391 {
 392         struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
 393         struct sock *sk = sock->sk;
 394         struct raw_sock *ro = raw_sk(sk);
 395
 396         if (peer)
 397                 return -EOPNOTSUPP;
 398
 399         addr->can_family  = AF_CAN;
 400         addr->can_ifindex = ro->ifindex;
 401
 402         *len = sizeof(*addr);
 403
 404         return 0;
 405 }
 406
 407 static int raw_setsockopt(struct socket *sock, int level, int optname,
 408                           char __user *optval, int optlen)
 409 {
 410         struct sock *sk = sock->sk;
 411         struct raw_sock *ro = raw_sk(sk);
 412         struct can_filter *filter = NULL;  /* dyn. alloc'ed filters */
 413         struct can_filter sfilter;         /* single filter */
 414         struct net_device *dev = NULL;
 415         can_err_mask_t err_mask = 0;
 416         int count = 0;
 417         int err = 0;
 418
 419         if (level != SOL_CAN_RAW)
 420                 return -EINVAL;
 421         if (optlen < 0)
 422                 return -EINVAL;
 423
 424         switch (optname) {
 425
 426         case CAN_RAW_FILTER:
 427                 if (optlen % sizeof(struct can_filter) != 0)
 428                         return -EINVAL;
 429
 430                 count = optlen / sizeof(struct can_filter);
 431
 432                 if (count > 1) {
 433                         /* filter does not fit into dfilter => alloc space */
 434                         filter = kmalloc(optlen, GFP_KERNEL);
 435                         if (!filter)
 436                                 return -ENOMEM;
 437
 438                         err = copy_from_user(filter, optval, optlen);
 439                         if (err) {
 440                                 kfree(filter);
 441                                 return err;
 442                         }
 443                 } else if (count == 1) {
 444                         err = copy_from_user(&sfilter, optval, optlen);
 445                         if (err)
 446                                 return err;
 447                 }
 448
 449                 lock_sock(sk);
 450
 451                 if (ro->bound && ro->ifindex)
 452                         dev = dev_get_by_index(&init_net, ro->ifindex);
 453
 454                 if (ro->bound) {
 455                         /* (try to) register the new filters */
 456                         if (count == 1)
 457                                 err = raw_enable_filters(dev, sk, &sfilter, 1);
 458                         else
 459                                 err = raw_enable_filters(dev, sk, filter,
 460                                                          count);
 461                         if (err) {
 462                                 if (count > 1)
 463                                         kfree(filter);
 464                                 goto out_fil;
 465                         }
 466
 467                         /* remove old filter registrations */
 468                         raw_disable_filters(dev, sk, ro->filter, ro->count);
 469                 }
 470
 471                 /* remove old filter space */
 472                 if (ro->count > 1)
 473                         kfree(ro->filter);
 474
 475                 /* link new filters to the socket */
 476                 if (count == 1) {
 477                         /* copy filter data for single filter */
 478                         ro->dfilter = sfilter;
 479                         filter = &ro->dfilter;
 480                 }
 481                 ro->filter = filter;
 482                 ro->count  = count;
 483
 484  out_fil:
 485                 if (dev)
 486                         dev_put(dev);
 487
 488                 release_sock(sk);
 489
 490                 break;
 491
 492         case CAN_RAW_ERR_FILTER:
 493                 if (optlen != sizeof(err_mask))
 494                         return -EINVAL;
 495
 496                 err = copy_from_user(&err_mask, optval, optlen);
 497                 if (err)
 498                         return err;
 499
 500                 err_mask &= CAN_ERR_MASK;
 501
 502                 lock_sock(sk);
 503
 504                 if (ro->bound && ro->ifindex)
 505                         dev = dev_get_by_index(&init_net, ro->ifindex);
 506
 507                 /* remove current error mask */
 508                 if (ro->bound) {
 509                         /* (try to) register the new err_mask */
 510                         err = raw_enable_errfilter(dev, sk, err_mask);
 511
 512                         if (err)
 513                                 goto out_err;
 514
 515                         /* remove old err_mask registration */
 516                         raw_disable_errfilter(dev, sk, ro->err_mask);
 517                 }
 518
 519                 /* link new err_mask to the socket */
 520                 ro->err_mask = err_mask;
 521
 522  out_err:
 523                 if (dev)
 524                         dev_put(dev);
 525
 526                 release_sock(sk);
 527
 528                 break;
 529
 530         case CAN_RAW_LOOPBACK:
 531                 if (optlen != sizeof(ro->loopback))
 532                         return -EINVAL;
 533
 534                 err = copy_from_user(&ro->loopback, optval, optlen);
 535
 536                 break;
 537
 538         case CAN_RAW_RECV_OWN_MSGS:
 539                 if (optlen != sizeof(ro->recv_own_msgs))
 540                         return -EINVAL;
 541
 542                 err = copy_from_user(&ro->recv_own_msgs, optval, optlen);
 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                         err = copy_to_user(optval, ro->filter, len);
 577                 } else
 578                         len = 0;
 579                 release_sock(sk);
 580
 581                 if (!err)
 582                         err = put_user(len, optlen);
 583                 return err;
 584
 585         case CAN_RAW_ERR_FILTER:
 586                 if (len > sizeof(can_err_mask_t))
 587                         len = sizeof(can_err_mask_t);
 588                 val = &ro->err_mask;
 589                 break;
 590
 591         case CAN_RAW_LOOPBACK:
 592                 if (len > sizeof(int))
 593                         len = sizeof(int);
 594                 val = &ro->loopback;
 595                 break;
 596
 597         case CAN_RAW_RECV_OWN_MSGS:
 598                 if (len > sizeof(int))
 599                         len = sizeof(int);
 600                 val = &ro->recv_own_msgs;
 601                 break;
 602
 603         default:
 604                 return -ENOPROTOOPT;
 605         }
 606
 607         if (put_user(len, optlen))
 608                 return -EFAULT;
 609         if (copy_to_user(optval, val, len))
 610                 return -EFAULT;
 611         return 0;
 612 }
 613
 614 static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
 615                        struct msghdr *msg, size_t size)
 616 {
 617         struct sock *sk = sock->sk;
 618         struct raw_sock *ro = raw_sk(sk);
 619         struct sk_buff *skb;
 620         struct net_device *dev;
 621         int ifindex;
 622         int err;
 623
 624         if (msg->msg_name) {
 625                 struct sockaddr_can *addr =
 626                         (struct sockaddr_can *)msg->msg_name;
 627
 628                 if (addr->can_family != AF_CAN)
 629                         return -EINVAL;
 630
 631                 ifindex = addr->can_ifindex;
 632         } else
 633                 ifindex = ro->ifindex;
 634
 635         dev = dev_get_by_index(&init_net, ifindex);
 636         if (!dev)
 637                 return -ENXIO;
 638
 639         skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
 640                                   &err);
 641         if (!skb) {
 642                 dev_put(dev);
 643                 return err;
 644         }
 645
 646         err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
 647         if (err < 0) {
 648                 kfree_skb(skb);
 649                 dev_put(dev);
 650                 return err;
 651         }
 652         skb->dev = dev;
 653         skb->sk  = sk;
 654
 655         err = can_send(skb, ro->loopback);
 656
 657         dev_put(dev);
 658
 659         if (err)
 660                 return err;
 661
 662         return size;
 663 }
 664
 665 static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
 666                        struct msghdr *msg, size_t size, int flags)
 667 {
 668         struct sock *sk = sock->sk;
 669         struct sk_buff *skb;
 670         int err = 0;
 671         int noblock;
 672
 673         noblock =  flags & MSG_DONTWAIT;
 674         flags   &= ~MSG_DONTWAIT;
 675
 676         skb = skb_recv_datagram(sk, flags, noblock, &err);
 677         if (!skb)
 678                 return err;
 679
 680         if (size < skb->len)
 681                 msg->msg_flags |= MSG_TRUNC;
 682         else
 683                 size = skb->len;
 684
 685         err = memcpy_toiovec(msg->msg_iov, skb->data, size);
 686         if (err < 0) {
 687                 skb_free_datagram(sk, skb);
 688                 return err;
 689         }
 690
 691         sock_recv_timestamp(msg, sk, skb);
 692
 693         if (msg->msg_name) {
 694                 msg->msg_namelen = sizeof(struct sockaddr_can);
 695                 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
 696         }
 697
 698         skb_free_datagram(sk, skb);
 699
 700         return size;
 701 }
 702
 703 static struct proto_ops raw_ops __read_mostly = {
 704         .family        = PF_CAN,
 705         .release       = raw_release,
 706         .bind          = raw_bind,
 707         .connect       = sock_no_connect,
 708         .socketpair    = sock_no_socketpair,
 709         .accept        = sock_no_accept,
 710         .getname       = raw_getname,
 711         .poll          = datagram_poll,
 712         .ioctl         = NULL,          /* use can_ioctl() from af_can.c */
 713         .listen        = sock_no_listen,
 714         .shutdown      = sock_no_shutdown,
 715         .setsockopt    = raw_setsockopt,
 716         .getsockopt    = raw_getsockopt,
 717         .sendmsg       = raw_sendmsg,
 718         .recvmsg       = raw_recvmsg,
 719         .mmap          = sock_no_mmap,
 720         .sendpage      = sock_no_sendpage,
 721 };
 722
 723 static struct proto raw_proto __read_mostly = {
 724         .name       = "CAN_RAW",
 725         .owner      = THIS_MODULE,
 726         .obj_size   = sizeof(struct raw_sock),
 727         .init       = raw_init,
 728 };
 729
 730 static struct can_proto raw_can_proto __read_mostly = {
 731         .type       = SOCK_RAW,
 732         .protocol   = CAN_RAW,
 733         .capability = -1,
 734         .ops        = &raw_ops,
 735         .prot       = &raw_proto,
 736 };
 737
 738 static __init int raw_module_init(void)
 739 {
 740         int err;
 741
 742         printk(banner);
 743
 744         err = can_proto_register(&raw_can_proto);
 745         if (err < 0)
 746                 printk(KERN_ERR "can: registration of raw protocol failed\n");
 747
 748         return err;
 749 }
 750
 751 static __exit void raw_module_exit(void)
 752 {
 753         can_proto_unregister(&raw_can_proto);
 754 }
 755
 756 module_init(raw_module_init);
 757 module_exit(raw_module_exit);