arch/um/drivers/net_kern.c

   1 /*
   2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   3  * James Leu (jleu@mindspring.net).
   4  * Copyright (C) 2001 by various other people who didn't put their name here.
   5  * Licensed under the GPL.
   6  */
   7
   8 #include "linux/config.h"
   9 #include "linux/kernel.h"
  10 #include "linux/netdevice.h"
  11 #include "linux/rtnetlink.h"
  12 #include "linux/skbuff.h"
  13 #include "linux/socket.h"
  14 #include "linux/spinlock.h"
  15 #include "linux/module.h"
  16 #include "linux/init.h"
  17 #include "linux/etherdevice.h"
  18 #include "linux/list.h"
  19 #include "linux/inetdevice.h"
  20 #include "linux/ctype.h"
  21 #include "linux/bootmem.h"
  22 #include "user_util.h"
  23 #include "kern_util.h"
  24 #include "net_kern.h"
  25 #include "net_user.h"
  26 #include "mconsole_kern.h"
  27 #include "init.h"
  28 #include "irq_user.h"
  29 #include "irq_kern.h"
  30
  31 static spinlock_t opened_lock = SPIN_LOCK_UNLOCKED;
  32 LIST_HEAD(opened);
  33
  34 static int uml_net_rx(struct net_device *dev)
  35 {
  36         struct uml_net_private *lp = dev->priv;
  37         int pkt_len;
  38         struct sk_buff *skb;
  39
  40         /* If we can't allocate memory, try again next round. */
  41         skb = dev_alloc_skb(dev->mtu);
  42         if (skb == NULL) {
  43                 lp->stats.rx_dropped++;
  44                 return 0;
  45         }
  46
  47         skb->dev = dev;
  48         skb_put(skb, dev->mtu);
  49         skb->mac.raw = skb->data;
  50         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  51
  52         if (pkt_len > 0) {
  53                 skb_trim(skb, pkt_len);
  54                 skb->protocol = (*lp->protocol)(skb);
  55                 netif_rx(skb);
  56
  57                 lp->stats.rx_bytes += skb->len;
  58                 lp->stats.rx_packets++;
  59                 return pkt_len;
  60         }
  61
  62         kfree_skb(skb);
  63         return pkt_len;
  64 }
  65
  66 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  67 {
  68         struct net_device *dev = dev_id;
  69         struct uml_net_private *lp = dev->priv;
  70         int err;
  71
  72         if(!netif_running(dev))
  73                 return(IRQ_NONE);
  74
  75         spin_lock(&lp->lock);
  76         while((err = uml_net_rx(dev)) > 0) ;
  77         if(err < 0) {
  78                 printk(KERN_ERR
  79                        "Device '%s' read returned %d, shutting it down\n",
  80                        dev->name, err);
  81                 dev_close(dev);
  82                 goto out;
  83         }
  84         reactivate_fd(lp->fd, UM_ETH_IRQ);
  85
  86  out:
  87         spin_unlock(&lp->lock);
  88         return(IRQ_HANDLED);
  89 }
  90
  91 static int uml_net_open(struct net_device *dev)
  92 {
  93         struct uml_net_private *lp = dev->priv;
  94         char addr[sizeof("255.255.255.255\0")];
  95         int err;
  96
  97         spin_lock(&lp->lock);
  98
  99         if(lp->fd >= 0){
 100                 err = -ENXIO;
 101                 goto out;
 102         }
 103
 104         if(!lp->have_mac){
 105                 dev_ip_addr(dev, addr, &lp->mac[2]);
 106                 set_ether_mac(dev, lp->mac);
 107         }
 108
 109         lp->fd = (*lp->open)(&lp->user);
 110         if(lp->fd < 0){
 111                 err = lp->fd;
 112                 goto out;
 113         }
 114
 115         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 116                              SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
 117         if(err != 0){
 118                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 119                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 120                 lp->fd = -1;
 121                 err = -ENETUNREACH;
 122         }
 123
 124         lp->tl.data = (unsigned long) &lp->user;
 125         netif_start_queue(dev);
 126
 127         spin_lock(&opened_lock);
 128         list_add(&lp->list, &opened);
 129         spin_unlock(&opened_lock);
 130         MOD_INC_USE_COUNT;
 131  out:
 132         spin_unlock(&lp->lock);
 133         return(err);
 134 }
 135
 136 static int uml_net_close(struct net_device *dev)
 137 {
 138         struct uml_net_private *lp = dev->priv;
 139
 140         netif_stop_queue(dev);
 141         spin_lock(&lp->lock);
 142
 143         free_irq(dev->irq, dev);
 144         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 145         lp->fd = -1;
 146         spin_lock(&opened_lock);
 147         list_del(&lp->list);
 148         spin_unlock(&opened_lock);
 149
 150         MOD_DEC_USE_COUNT;
 151         spin_unlock(&lp->lock);
 152         return 0;
 153 }
 154
 155 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 156 {
 157         struct uml_net_private *lp = dev->priv;
 158         unsigned long flags;
 159         int len;
 160
 161         netif_stop_queue(dev);
 162
 163         spin_lock_irqsave(&lp->lock, flags);
 164
 165         len = (*lp->write)(lp->fd, &skb, lp);
 166
 167         if(len == skb->len) {
 168                 lp->stats.tx_packets++;
 169                 lp->stats.tx_bytes += skb->len;
 170                 dev->trans_start = jiffies;
 171                 netif_start_queue(dev);
 172
 173                 /* this is normally done in the interrupt when tx finishes */
 174                 netif_wake_queue(dev);
 175         }
 176         else if(len == 0){
 177                 netif_start_queue(dev);
 178                 lp->stats.tx_dropped++;
 179         }
 180         else {
 181                 netif_start_queue(dev);
 182                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 183         }
 184
 185         spin_unlock_irqrestore(&lp->lock, flags);
 186
 187         dev_kfree_skb(skb);
 188
 189         return 0;
 190 }
 191
 192 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 193 {
 194         struct uml_net_private *lp = dev->priv;
 195         return &lp->stats;
 196 }
 197
 198 static void uml_net_set_multicast_list(struct net_device *dev)
 199 {
 200         if (dev->flags & IFF_PROMISC) return;
 201         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 202         else dev->flags &= ~IFF_ALLMULTI;
 203 }
 204
 205 static void uml_net_tx_timeout(struct net_device *dev)
 206 {
 207         dev->trans_start = jiffies;
 208         netif_wake_queue(dev);
 209 }
 210
 211 static int uml_net_set_mac(struct net_device *dev, void *addr)
 212 {
 213         struct uml_net_private *lp = dev->priv;
 214         struct sockaddr *hwaddr = addr;
 215
 216         spin_lock(&lp->lock);
 217         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
 218         spin_unlock(&lp->lock);
 219
 220         return(0);
 221 }
 222
 223 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 224 {
 225         struct uml_net_private *lp = dev->priv;
 226         int err = 0;
 227
 228         spin_lock(&lp->lock);
 229
 230         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 231         if(new_mtu < 0){
 232                 err = new_mtu;
 233                 goto out;
 234         }
 235
 236         dev->mtu = new_mtu;
 237
 238  out:
 239         spin_unlock(&lp->lock);
 240         return err;
 241 }
 242
 243 static int uml_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 244 {
 245         return(-EINVAL);
 246 }
 247
 248 void uml_net_user_timer_expire(unsigned long _conn)
 249 {
 250 #ifdef undef
 251         struct connection *conn = (struct connection *)_conn;
 252
 253         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 254         do_connect(conn);
 255 #endif
 256 }
 257
 258 static spinlock_t devices_lock = SPIN_LOCK_UNLOCKED;
 259 static struct list_head devices = LIST_HEAD_INIT(devices);
 260
 261 static int eth_configure(int n, void *init, char *mac,
 262                          struct transport *transport)
 263 {
 264         struct uml_net *device;
 265         struct net_device *dev;
 266         struct uml_net_private *lp;
 267         int save, err, size;
 268
 269         size = transport->private_size + sizeof(struct uml_net_private) +
 270                 sizeof(((struct uml_net_private *) 0)->user);
 271
 272         device = kmalloc(sizeof(*device), GFP_KERNEL);
 273         if (device == NULL) {
 274                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 275                 return(1);
 276         }
 277
 278         memset(device, 0, sizeof(*device));
 279         INIT_LIST_HEAD(&device->list);
 280         device->index = n;
 281
 282         spin_lock(&devices_lock);
 283         list_add(&device->list, &devices);
 284         spin_unlock(&devices_lock);
 285
 286         if (setup_etheraddr(mac, device->mac))
 287                 device->have_mac = 1;
 288
 289         printk(KERN_INFO "Netdevice %d ", n);
 290         if (device->have_mac)
 291                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 292                        device->mac[0], device->mac[1],
 293                        device->mac[2], device->mac[3],
 294                        device->mac[4], device->mac[5]);
 295         printk(": ");
 296         dev = alloc_etherdev(size);
 297         if (dev == NULL) {
 298                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 299                 return 1;
 300         }
 301
 302         /* If this name ends up conflicting with an existing registered
 303          * netdevice, that is OK, register_netdev{,ice}() will notice this
 304          * and fail.
 305          */
 306         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 307         device->dev = dev;
 308
 309         (*transport->kern->init)(dev, init);
 310
 311         dev->mtu = transport->user->max_packet;
 312         dev->open = uml_net_open;
 313         dev->hard_start_xmit = uml_net_start_xmit;
 314         dev->stop = uml_net_close;
 315         dev->get_stats = uml_net_get_stats;
 316         dev->set_multicast_list = uml_net_set_multicast_list;
 317         dev->tx_timeout = uml_net_tx_timeout;
 318         dev->set_mac_address = uml_net_set_mac;
 319         dev->change_mtu = uml_net_change_mtu;
 320         dev->do_ioctl = uml_net_ioctl;
 321         dev->watchdog_timeo = (HZ >> 1);
 322         dev->irq = UM_ETH_IRQ;
 323
 324         rtnl_lock();
 325         err = register_netdevice(dev);
 326         rtnl_unlock();
 327         if (err) {
 328                 device->dev = NULL;
 329                 /* XXX: should we call ->remove() here? */
 330                 free_netdev(dev);
 331                 return 1;
 332         }
 333         lp = dev->priv;
 334
 335         /* lp.user is the first four bytes of the transport data, which
 336          * has already been initialized.  This structure assignment will
 337          * overwrite that, so we make sure that .user gets overwritten with
 338          * what it already has.
 339          */
 340         save = lp->user[0];
 341         *lp = ((struct uml_net_private)
 342                 { .list                 = LIST_HEAD_INIT(lp->list),
 343                   .lock                 = SPIN_LOCK_UNLOCKED,
 344                   .dev                  = dev,
 345                   .fd                   = -1,
 346                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 347                   .have_mac             = device->have_mac,
 348                   .protocol             = transport->kern->protocol,
 349                   .open                 = transport->user->open,
 350                   .close                = transport->user->close,
 351                   .remove               = transport->user->remove,
 352                   .read                 = transport->kern->read,
 353                   .write                = transport->kern->write,
 354                   .add_address          = transport->user->add_address,
 355                   .delete_address       = transport->user->delete_address,
 356                   .set_mtu              = transport->user->set_mtu,
 357                   .user                 = { save } });
 358
 359         init_timer(&lp->tl);
 360         lp->tl.function = uml_net_user_timer_expire;
 361         if (lp->have_mac)
 362                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 363
 364         if (transport->user->init)
 365                 (*transport->user->init)(&lp->user, dev);
 366
 367         if (device->have_mac)
 368                 set_ether_mac(dev, device->mac);
 369         return(0);
 370 }
 371
 372 static struct uml_net *find_device(int n)
 373 {
 374         struct uml_net *device;
 375         struct list_head *ele;
 376
 377         spin_lock(&devices_lock);
 378         list_for_each(ele, &devices){
 379                 device = list_entry(ele, struct uml_net, list);
 380                 if(device->index == n)
 381                         goto out;
 382         }
 383         device = NULL;
 384  out:
 385         spin_unlock(&devices_lock);
 386         return(device);
 387 }
 388
 389 static int eth_parse(char *str, int *index_out, char **str_out)
 390 {
 391         char *end;
 392         int n;
 393
 394         n = simple_strtoul(str, &end, 0);
 395         if(end == str){
 396                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 397                 return(1);
 398         }
 399         if(n < 0){
 400                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 401                 return(1);
 402         }
 403         str = end;
 404         if(*str != '='){
 405                 printk(KERN_ERR
 406                        "eth_setup: expected '=' after device number\n");
 407                 return(1);
 408         }
 409         str++;
 410         if(find_device(n)){
 411                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 412                        n);
 413                 return(1);
 414         }
 415         if(index_out) *index_out = n;
 416         *str_out = str;
 417         return(0);
 418 }
 419
 420 struct eth_init {
 421         struct list_head list;
 422         char *init;
 423         int index;
 424 };
 425
 426 /* Filled in at boot time.  Will need locking if the transports become
 427  * modular.
 428  */
 429 struct list_head transports = LIST_HEAD_INIT(transports);
 430
 431 /* Filled in during early boot */
 432 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 433
 434 static int check_transport(struct transport *transport, char *eth, int n,
 435                            void **init_out, char **mac_out)
 436 {
 437         int len;
 438
 439         len = strlen(transport->name);
 440         if(strncmp(eth, transport->name, len))
 441                 return(0);
 442
 443         eth += len;
 444         if(*eth == ',')
 445                 eth++;
 446         else if(*eth != '\0')
 447                 return(0);
 448
 449         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 450         if(*init_out == NULL)
 451                 return(1);
 452
 453         if(!transport->setup(eth, mac_out, *init_out)){
 454                 kfree(*init_out);
 455                 *init_out = NULL;
 456         }
 457         return(1);
 458 }
 459
 460 void register_transport(struct transport *new)
 461 {
 462         struct list_head *ele, *next;
 463         struct eth_init *eth;
 464         void *init;
 465         char *mac = NULL;
 466         int match;
 467
 468         list_add(&new->list, &transports);
 469
 470         list_for_each_safe(ele, next, &eth_cmd_line){
 471                 eth = list_entry(ele, struct eth_init, list);
 472                 match = check_transport(new, eth->init, eth->index, &init,
 473                                         &mac);
 474                 if(!match)
 475                         continue;
 476                 else if(init != NULL){
 477                         eth_configure(eth->index, init, mac, new);
 478                         kfree(init);
 479                 }
 480                 list_del(&eth->list);
 481         }
 482 }
 483
 484 static int eth_setup_common(char *str, int index)
 485 {
 486         struct list_head *ele;
 487         struct transport *transport;
 488         void *init;
 489         char *mac = NULL;
 490
 491         list_for_each(ele, &transports){
 492                 transport = list_entry(ele, struct transport, list);
 493                 if(!check_transport(transport, str, index, &init, &mac))
 494                         continue;
 495                 if(init != NULL){
 496                         eth_configure(index, init, mac, transport);
 497                         kfree(init);
 498                 }
 499                 return(1);
 500         }
 501         return(0);
 502 }
 503
 504 static int eth_setup(char *str)
 505 {
 506         struct eth_init *new;
 507         int n, err;
 508
 509         err = eth_parse(str, &n, &str);
 510         if(err) return(1);
 511
 512         new = alloc_bootmem(sizeof(new));
 513         if (new == NULL){
 514                 printk("eth_init : alloc_bootmem failed\n");
 515                 return(1);
 516         }
 517
 518         INIT_LIST_HEAD(&new->list);
 519         new->index = n;
 520         new->init = str;
 521
 522         list_add_tail(&new->list, &eth_cmd_line);
 523         return(1);
 524 }
 525
 526 __setup("eth", eth_setup);
 527 __uml_help(eth_setup,
 528 "eth[0-9]+=<transport>,<options>\n"
 529 "    Configure a network device.\n\n"
 530 );
 531
 532 static int eth_init(void)
 533 {
 534         struct list_head *ele, *next;
 535         struct eth_init *eth;
 536
 537         list_for_each_safe(ele, next, &eth_cmd_line){
 538                 eth = list_entry(ele, struct eth_init, list);
 539
 540                 if(eth_setup_common(eth->init, eth->index))
 541                         list_del(&eth->list);
 542         }
 543
 544         return(1);
 545 }
 546
 547 __initcall(eth_init);
 548
 549 static int net_config(char *str)
 550 {
 551         int n, err;
 552
 553         err = eth_parse(str, &n, &str);
 554         if(err) return(err);
 555
 556         str = uml_strdup(str);
 557         if(str == NULL){
 558                 printk(KERN_ERR "net_config failed to strdup string\n");
 559                 return(-1);
 560         }
 561         err = !eth_setup_common(str, n);
 562         if(err)
 563                 kfree(str);
 564         return(err);
 565 }
 566
 567 static int net_remove(char *str)
 568 {
 569         struct uml_net *device;
 570         struct net_device *dev;
 571         struct uml_net_private *lp;
 572         char *end;
 573         int n;
 574
 575         n = simple_strtoul(str, &end, 0);
 576         if((*end != '\0') || (end == str))
 577                 return(-1);
 578
 579         device = find_device(n);
 580         if(device == NULL)
 581                 return(0);
 582
 583         dev = device->dev;
 584         lp = dev->priv;
 585         if(lp->fd > 0) return(-1);
 586         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 587         unregister_netdev(dev);
 588
 589         list_del(&device->list);
 590         kfree(device);
 591         free_netdev(dev);
 592         return(0);
 593 }
 594
 595 static struct mc_device net_mc = {
 596         .name           = "eth",
 597         .config         = net_config,
 598         .get_config     = NULL,
 599         .remove         = net_remove,
 600 };
 601
 602 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 603                               void *ptr)
 604 {
 605         struct in_ifaddr *ifa = ptr;
 606         u32 addr = ifa->ifa_address;
 607         u32 netmask = ifa->ifa_mask;
 608         struct net_device *dev = ifa->ifa_dev->dev;
 609         struct uml_net_private *lp;
 610         void (*proc)(unsigned char *, unsigned char *, void *);
 611         unsigned char addr_buf[4], netmask_buf[4];
 612
 613         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 614
 615         lp = dev->priv;
 616
 617         proc = NULL;
 618         switch (event){
 619         case NETDEV_UP:
 620                 proc = lp->add_address;
 621                 break;
 622         case NETDEV_DOWN:
 623                 proc = lp->delete_address;
 624                 break;
 625         }
 626         if(proc != NULL){
 627                 addr_buf[0] = addr & 0xff;
 628                 addr_buf[1] = (addr >> 8) & 0xff;
 629                 addr_buf[2] = (addr >> 16) & 0xff;
 630                 addr_buf[3] = addr >> 24;
 631                 netmask_buf[0] = netmask & 0xff;
 632                 netmask_buf[1] = (netmask >> 8) & 0xff;
 633                 netmask_buf[2] = (netmask >> 16) & 0xff;
 634                 netmask_buf[3] = netmask >> 24;
 635                 (*proc)(addr_buf, netmask_buf, &lp->user);
 636         }
 637         return(NOTIFY_DONE);
 638 }
 639
 640 struct notifier_block uml_inetaddr_notifier = {
 641         .notifier_call          = uml_inetaddr_event,
 642 };
 643
 644 static int uml_net_init(void)
 645 {
 646         struct list_head *ele;
 647         struct uml_net_private *lp;
 648         struct in_device *ip;
 649         struct in_ifaddr *in;
 650
 651         mconsole_register_dev(&net_mc);
 652         register_inetaddr_notifier(&uml_inetaddr_notifier);
 653
 654         /* Devices may have been opened already, so the uml_inetaddr_notifier
 655          * didn't get a chance to run for them.  This fakes it so that
 656          * addresses which have already been set up get handled properly.
 657          */
 658         list_for_each(ele, &opened){
 659                 lp = list_entry(ele, struct uml_net_private, list);
 660                 ip = lp->dev->ip_ptr;
 661                 if(ip == NULL) continue;
 662                 in = ip->ifa_list;
 663                 while(in != NULL){
 664                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 665                         in = in->ifa_next;
 666                 }
 667         }
 668
 669         return(0);
 670 }
 671
 672 __initcall(uml_net_init);
 673
 674 static void close_devices(void)
 675 {
 676         struct list_head *ele;
 677         struct uml_net_private *lp;
 678
 679         list_for_each(ele, &opened){
 680                 lp = list_entry(ele, struct uml_net_private, list);
 681                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 682                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 683         }
 684 }
 685
 686 __uml_exitcall(close_devices);
 687
 688 int setup_etheraddr(char *str, unsigned char *addr)
 689 {
 690         char *end;
 691         int i;
 692
 693         if(str == NULL)
 694                 return(0);
 695         for(i=0;i<6;i++){
 696                 addr[i] = simple_strtoul(str, &end, 16);
 697                 if((end == str) ||
 698                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 699                         printk(KERN_ERR
 700                                "setup_etheraddr: failed to parse '%s' "
 701                                "as an ethernet address\n", str);
 702                         return(0);
 703                 }
 704                 str = end + 1;
 705         }
 706         if(addr[0] & 1){
 707                 printk(KERN_ERR
 708                        "Attempt to assign a broadcast ethernet address to a "
 709                        "device disallowed\n");
 710                 return(0);
 711         }
 712         return(1);
 713 }
 714
 715 void dev_ip_addr(void *d, char *buf, char *bin_buf)
 716 {
 717         struct net_device *dev = d;
 718         struct in_device *ip = dev->ip_ptr;
 719         struct in_ifaddr *in;
 720         u32 addr;
 721
 722         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 723                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 724                        "IP address\n");
 725                 return;
 726         }
 727         addr = in->ifa_address;
 728         sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff,
 729                 (addr >> 16) & 0xff, addr >> 24);
 730         if(bin_buf){
 731                 bin_buf[0] = addr & 0xff;
 732                 bin_buf[1] = (addr >> 8) & 0xff;
 733                 bin_buf[2] = (addr >> 16) & 0xff;
 734                 bin_buf[3] = addr >> 24;
 735         }
 736 }
 737
 738 void set_ether_mac(void *d, unsigned char *addr)
 739 {
 740         struct net_device *dev = d;
 741
 742         memcpy(dev->dev_addr, addr, ETH_ALEN);
 743 }
 744
 745 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 746 {
 747         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 748                 struct sk_buff *skb2;
 749
 750                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 751                 dev_kfree_skb(skb);
 752                 skb = skb2;
 753         }
 754         if(skb != NULL) skb_put(skb, extra);
 755         return(skb);
 756 }
 757
 758 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 759                                         void *),
 760                     void *arg)
 761 {
 762         struct net_device *dev = d;
 763         struct in_device *ip = dev->ip_ptr;
 764         struct in_ifaddr *in;
 765         unsigned char address[4], netmask[4];
 766
 767         if(ip == NULL) return;
 768         in = ip->ifa_list;
 769         while(in != NULL){
 770                 address[0] = in->ifa_address & 0xff;
 771                 address[1] = (in->ifa_address >> 8) & 0xff;
 772                 address[2] = (in->ifa_address >> 16) & 0xff;
 773                 address[3] = in->ifa_address >> 24;
 774                 netmask[0] = in->ifa_mask & 0xff;
 775                 netmask[1] = (in->ifa_mask >> 8) & 0xff;
 776                 netmask[2] = (in->ifa_mask >> 16) & 0xff;
 777                 netmask[3] = in->ifa_mask >> 24;
 778                 (*cb)(address, netmask, arg);
 779                 in = in->ifa_next;
 780         }
 781 }
 782
 783 int dev_netmask(void *d, void *m)
 784 {
 785         struct net_device *dev = d;
 786         struct in_device *ip = dev->ip_ptr;
 787         struct in_ifaddr *in;
 788         __u32 *mask_out = m;
 789
 790         if(ip == NULL)
 791                 return(1);
 792
 793         in = ip->ifa_list;
 794         if(in == NULL)
 795                 return(1);
 796
 797         *mask_out = in->ifa_mask;
 798         return(0);
 799 }
 800
 801 void *get_output_buffer(int *len_out)
 802 {
 803         void *ret;
 804
 805         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 806         if(ret) *len_out = PAGE_SIZE;
 807         else *len_out = 0;
 808         return(ret);
 809 }
 810
 811 void free_output_buffer(void *buffer)
 812 {
 813         free_pages((unsigned long) buffer, 0);
 814 }
 815
 816 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 817                      char **gate_addr)
 818 {
 819         char *remain;
 820
 821         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 822         if(remain != NULL){
 823                 printk("tap_setup_common - Extra garbage on specification : "
 824                        "'%s'\n", remain);
 825                 return(1);
 826         }
 827
 828         return(0);
 829 }
 830
 831 unsigned short eth_protocol(struct sk_buff *skb)
 832 {
 833         return(eth_type_trans(skb, skb->dev));
 834 }
 835
 836 /*
 837  * Overrides for Emacs so that we follow Linus's tabbing style.
 838  * Emacs will notice this stuff at the end of the file and automatically
 839  * adjust the settings for this buffer only.  This must remain at the end
 840  * of the file.
 841  * ---------------------------------------------------------------------------
 842  * Local variables:
 843  * c-file-style: "linux"
 844  * End:
 845  */