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 "linux/ethtool.h"
  23 #include "asm/uaccess.h"
  24 #include "user_util.h"
  25 #include "kern_util.h"
  26 #include "net_kern.h"
  27 #include "net_user.h"
  28 #include "mconsole_kern.h"
  29 #include "init.h"
  30 #include "irq_user.h"
  31 #include "irq_kern.h"
  32
  33 static spinlock_t opened_lock = SPIN_LOCK_UNLOCKED;
  34 LIST_HEAD(opened);
  35
  36 static int uml_net_rx(struct net_device *dev)
  37 {
  38         struct uml_net_private *lp = dev->priv;
  39         int pkt_len;
  40         struct sk_buff *skb;
  41
  42         /* If we can't allocate memory, try again next round. */
  43         skb = dev_alloc_skb(dev->mtu);
  44         if (skb == NULL) {
  45                 lp->stats.rx_dropped++;
  46                 return 0;
  47         }
  48
  49         skb->dev = dev;
  50         skb_put(skb, dev->mtu);
  51         skb->mac.raw = skb->data;
  52         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  53
  54         if (pkt_len > 0) {
  55                 skb_trim(skb, pkt_len);
  56                 skb->protocol = (*lp->protocol)(skb);
  57                 netif_rx(skb);
  58
  59                 lp->stats.rx_bytes += skb->len;
  60                 lp->stats.rx_packets++;
  61                 return pkt_len;
  62         }
  63
  64         kfree_skb(skb);
  65         return pkt_len;
  66 }
  67
  68 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  69 {
  70         struct net_device *dev = dev_id;
  71         struct uml_net_private *lp = dev->priv;
  72         int err;
  73
  74         if(!netif_running(dev))
  75                 return(IRQ_NONE);
  76
  77         spin_lock(&lp->lock);
  78         while((err = uml_net_rx(dev)) > 0) ;
  79         if(err < 0) {
  80                 printk(KERN_ERR
  81                        "Device '%s' read returned %d, shutting it down\n",
  82                        dev->name, err);
  83                 dev_close(dev);
  84                 goto out;
  85         }
  86         reactivate_fd(lp->fd, UM_ETH_IRQ);
  87
  88  out:
  89         spin_unlock(&lp->lock);
  90         return(IRQ_HANDLED);
  91 }
  92
  93 static int uml_net_open(struct net_device *dev)
  94 {
  95         struct uml_net_private *lp = dev->priv;
  96         char addr[sizeof("255.255.255.255\0")];
  97         int err;
  98
  99         spin_lock(&lp->lock);
 100
 101         if(lp->fd >= 0){
 102                 err = -ENXIO;
 103                 goto out;
 104         }
 105
 106         if(!lp->have_mac){
 107                 dev_ip_addr(dev, addr, &lp->mac[2]);
 108                 set_ether_mac(dev, lp->mac);
 109         }
 110
 111         lp->fd = (*lp->open)(&lp->user);
 112         if(lp->fd < 0){
 113                 err = lp->fd;
 114                 goto out;
 115         }
 116
 117         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 118                              SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
 119         if(err != 0){
 120                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 121                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 122                 lp->fd = -1;
 123                 err = -ENETUNREACH;
 124         }
 125
 126         lp->tl.data = (unsigned long) &lp->user;
 127         netif_start_queue(dev);
 128
 129         spin_lock(&opened_lock);
 130         list_add(&lp->list, &opened);
 131         spin_unlock(&opened_lock);
 132  out:
 133         spin_unlock(&lp->lock);
 134         return(err);
 135 }
 136
 137 static int uml_net_close(struct net_device *dev)
 138 {
 139         struct uml_net_private *lp = dev->priv;
 140
 141         netif_stop_queue(dev);
 142         spin_lock(&lp->lock);
 143
 144         free_irq(dev->irq, dev);
 145         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 146         lp->fd = -1;
 147         spin_lock(&opened_lock);
 148         list_del(&lp->list);
 149         spin_unlock(&opened_lock);
 150
 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         static const struct ethtool_drvinfo info = {
 246                 .cmd     = ETHTOOL_GDRVINFO,
 247                 .driver  = "uml virtual ethernet",
 248                 .version = "42",
 249         };
 250         void *useraddr;
 251         u32 ethcmd;
 252
 253         switch (cmd) {
 254         case SIOCETHTOOL:
 255                 useraddr = ifr->ifr_data;
 256                 if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
 257                         return -EFAULT;
 258                 switch (ethcmd) {
 259                 case ETHTOOL_GDRVINFO:
 260                         if (copy_to_user(useraddr, &info, sizeof(info)))
 261                                 return -EFAULT;
 262                         return 0;
 263                 default:
 264                         return -EOPNOTSUPP;
 265                 }
 266         default:
 267                 return -EINVAL;
 268         }
 269 }
 270
 271 void uml_net_user_timer_expire(unsigned long _conn)
 272 {
 273 #ifdef undef
 274         struct connection *conn = (struct connection *)_conn;
 275
 276         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 277         do_connect(conn);
 278 #endif
 279 }
 280
 281 static spinlock_t devices_lock = SPIN_LOCK_UNLOCKED;
 282 static struct list_head devices = LIST_HEAD_INIT(devices);
 283
 284 static int eth_configure(int n, void *init, char *mac,
 285                          struct transport *transport)
 286 {
 287         struct uml_net *device;
 288         struct net_device *dev;
 289         struct uml_net_private *lp;
 290         int save, err, size;
 291
 292         size = transport->private_size + sizeof(struct uml_net_private) +
 293                 sizeof(((struct uml_net_private *) 0)->user);
 294
 295         device = kmalloc(sizeof(*device), GFP_KERNEL);
 296         if (device == NULL) {
 297                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 298                 return(1);
 299         }
 300
 301         memset(device, 0, sizeof(*device));
 302         INIT_LIST_HEAD(&device->list);
 303         device->index = n;
 304
 305         spin_lock(&devices_lock);
 306         list_add(&device->list, &devices);
 307         spin_unlock(&devices_lock);
 308
 309         if (setup_etheraddr(mac, device->mac))
 310                 device->have_mac = 1;
 311
 312         printk(KERN_INFO "Netdevice %d ", n);
 313         if (device->have_mac)
 314                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 315                        device->mac[0], device->mac[1],
 316                        device->mac[2], device->mac[3],
 317                        device->mac[4], device->mac[5]);
 318         printk(": ");
 319         dev = alloc_etherdev(size);
 320         if (dev == NULL) {
 321                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 322                 return 1;
 323         }
 324
 325         /* If this name ends up conflicting with an existing registered
 326          * netdevice, that is OK, register_netdev{,ice}() will notice this
 327          * and fail.
 328          */
 329         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 330         device->dev = dev;
 331
 332         (*transport->kern->init)(dev, init);
 333
 334         dev->mtu = transport->user->max_packet;
 335         dev->open = uml_net_open;
 336         dev->hard_start_xmit = uml_net_start_xmit;
 337         dev->stop = uml_net_close;
 338         dev->get_stats = uml_net_get_stats;
 339         dev->set_multicast_list = uml_net_set_multicast_list;
 340         dev->tx_timeout = uml_net_tx_timeout;
 341         dev->set_mac_address = uml_net_set_mac;
 342         dev->change_mtu = uml_net_change_mtu;
 343         dev->do_ioctl = uml_net_ioctl;
 344         dev->watchdog_timeo = (HZ >> 1);
 345         dev->irq = UM_ETH_IRQ;
 346
 347         rtnl_lock();
 348         err = register_netdevice(dev);
 349         rtnl_unlock();
 350         if (err) {
 351                 device->dev = NULL;
 352                 /* XXX: should we call ->remove() here? */
 353                 free_netdev(dev);
 354                 return 1;
 355         }
 356         lp = dev->priv;
 357
 358         /* lp.user is the first four bytes of the transport data, which
 359          * has already been initialized.  This structure assignment will
 360          * overwrite that, so we make sure that .user gets overwritten with
 361          * what it already has.
 362          */
 363         save = lp->user[0];
 364         *lp = ((struct uml_net_private)
 365                 { .list                 = LIST_HEAD_INIT(lp->list),
 366                   .lock                 = SPIN_LOCK_UNLOCKED,
 367                   .dev                  = dev,
 368                   .fd                   = -1,
 369                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 370                   .have_mac             = device->have_mac,
 371                   .protocol             = transport->kern->protocol,
 372                   .open                 = transport->user->open,
 373                   .close                = transport->user->close,
 374                   .remove               = transport->user->remove,
 375                   .read                 = transport->kern->read,
 376                   .write                = transport->kern->write,
 377                   .add_address          = transport->user->add_address,
 378                   .delete_address       = transport->user->delete_address,
 379                   .set_mtu              = transport->user->set_mtu,
 380                   .user                 = { save } });
 381
 382         init_timer(&lp->tl);
 383         lp->tl.function = uml_net_user_timer_expire;
 384         if (lp->have_mac)
 385                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 386
 387         if (transport->user->init)
 388                 (*transport->user->init)(&lp->user, dev);
 389
 390         if (device->have_mac)
 391                 set_ether_mac(dev, device->mac);
 392         return(0);
 393 }
 394
 395 static struct uml_net *find_device(int n)
 396 {
 397         struct uml_net *device;
 398         struct list_head *ele;
 399
 400         spin_lock(&devices_lock);
 401         list_for_each(ele, &devices){
 402                 device = list_entry(ele, struct uml_net, list);
 403                 if(device->index == n)
 404                         goto out;
 405         }
 406         device = NULL;
 407  out:
 408         spin_unlock(&devices_lock);
 409         return(device);
 410 }
 411
 412 static int eth_parse(char *str, int *index_out, char **str_out)
 413 {
 414         char *end;
 415         int n;
 416
 417         n = simple_strtoul(str, &end, 0);
 418         if(end == str){
 419                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 420                 return(1);
 421         }
 422         if(n < 0){
 423                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 424                 return(1);
 425         }
 426         str = end;
 427         if(*str != '='){
 428                 printk(KERN_ERR
 429                        "eth_setup: expected '=' after device number\n");
 430                 return(1);
 431         }
 432         str++;
 433         if(find_device(n)){
 434                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 435                        n);
 436                 return(1);
 437         }
 438         if(index_out) *index_out = n;
 439         *str_out = str;
 440         return(0);
 441 }
 442
 443 struct eth_init {
 444         struct list_head list;
 445         char *init;
 446         int index;
 447 };
 448
 449 /* Filled in at boot time.  Will need locking if the transports become
 450  * modular.
 451  */
 452 struct list_head transports = LIST_HEAD_INIT(transports);
 453
 454 /* Filled in during early boot */
 455 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 456
 457 static int check_transport(struct transport *transport, char *eth, int n,
 458                            void **init_out, char **mac_out)
 459 {
 460         int len;
 461
 462         len = strlen(transport->name);
 463         if(strncmp(eth, transport->name, len))
 464                 return(0);
 465
 466         eth += len;
 467         if(*eth == ',')
 468                 eth++;
 469         else if(*eth != '\0')
 470                 return(0);
 471
 472         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 473         if(*init_out == NULL)
 474                 return(1);
 475
 476         if(!transport->setup(eth, mac_out, *init_out)){
 477                 kfree(*init_out);
 478                 *init_out = NULL;
 479         }
 480         return(1);
 481 }
 482
 483 void register_transport(struct transport *new)
 484 {
 485         struct list_head *ele, *next;
 486         struct eth_init *eth;
 487         void *init;
 488         char *mac = NULL;
 489         int match;
 490
 491         list_add(&new->list, &transports);
 492
 493         list_for_each_safe(ele, next, &eth_cmd_line){
 494                 eth = list_entry(ele, struct eth_init, list);
 495                 match = check_transport(new, eth->init, eth->index, &init,
 496                                         &mac);
 497                 if(!match)
 498                         continue;
 499                 else if(init != NULL){
 500                         eth_configure(eth->index, init, mac, new);
 501                         kfree(init);
 502                 }
 503                 list_del(&eth->list);
 504         }
 505 }
 506
 507 static int eth_setup_common(char *str, int index)
 508 {
 509         struct list_head *ele;
 510         struct transport *transport;
 511         void *init;
 512         char *mac = NULL;
 513
 514         list_for_each(ele, &transports){
 515                 transport = list_entry(ele, struct transport, list);
 516                 if(!check_transport(transport, str, index, &init, &mac))
 517                         continue;
 518                 if(init != NULL){
 519                         eth_configure(index, init, mac, transport);
 520                         kfree(init);
 521                 }
 522                 return(1);
 523         }
 524         return(0);
 525 }
 526
 527 static int eth_setup(char *str)
 528 {
 529         struct eth_init *new;
 530         int n, err;
 531
 532         err = eth_parse(str, &n, &str);
 533         if(err) return(1);
 534
 535         new = alloc_bootmem(sizeof(new));
 536         if (new == NULL){
 537                 printk("eth_init : alloc_bootmem failed\n");
 538                 return(1);
 539         }
 540
 541         INIT_LIST_HEAD(&new->list);
 542         new->index = n;
 543         new->init = str;
 544
 545         list_add_tail(&new->list, &eth_cmd_line);
 546         return(1);
 547 }
 548
 549 __setup("eth", eth_setup);
 550 __uml_help(eth_setup,
 551 "eth[0-9]+=<transport>,<options>\n"
 552 "    Configure a network device.\n\n"
 553 );
 554
 555 static int eth_init(void)
 556 {
 557         struct list_head *ele, *next;
 558         struct eth_init *eth;
 559
 560         list_for_each_safe(ele, next, &eth_cmd_line){
 561                 eth = list_entry(ele, struct eth_init, list);
 562
 563                 if(eth_setup_common(eth->init, eth->index))
 564                         list_del(&eth->list);
 565         }
 566
 567         return(1);
 568 }
 569
 570 __initcall(eth_init);
 571
 572 static int net_config(char *str)
 573 {
 574         int n, err;
 575
 576         err = eth_parse(str, &n, &str);
 577         if(err) return(err);
 578
 579         str = uml_strdup(str);
 580         if(str == NULL){
 581                 printk(KERN_ERR "net_config failed to strdup string\n");
 582                 return(-1);
 583         }
 584         err = !eth_setup_common(str, n);
 585         if(err)
 586                 kfree(str);
 587         return(err);
 588 }
 589
 590 static int net_remove(char *str)
 591 {
 592         struct uml_net *device;
 593         struct net_device *dev;
 594         struct uml_net_private *lp;
 595         char *end;
 596         int n;
 597
 598         n = simple_strtoul(str, &end, 0);
 599         if((*end != '\0') || (end == str))
 600                 return(-1);
 601
 602         device = find_device(n);
 603         if(device == NULL)
 604                 return(0);
 605
 606         dev = device->dev;
 607         lp = dev->priv;
 608         if(lp->fd > 0) return(-1);
 609         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 610         unregister_netdev(dev);
 611
 612         list_del(&device->list);
 613         kfree(device);
 614         free_netdev(dev);
 615         return(0);
 616 }
 617
 618 static struct mc_device net_mc = {
 619         .name           = "eth",
 620         .config         = net_config,
 621         .get_config     = NULL,
 622         .remove         = net_remove,
 623 };
 624
 625 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 626                               void *ptr)
 627 {
 628         struct in_ifaddr *ifa = ptr;
 629         u32 addr = ifa->ifa_address;
 630         u32 netmask = ifa->ifa_mask;
 631         struct net_device *dev = ifa->ifa_dev->dev;
 632         struct uml_net_private *lp;
 633         void (*proc)(unsigned char *, unsigned char *, void *);
 634         unsigned char addr_buf[4], netmask_buf[4];
 635
 636         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 637
 638         lp = dev->priv;
 639
 640         proc = NULL;
 641         switch (event){
 642         case NETDEV_UP:
 643                 proc = lp->add_address;
 644                 break;
 645         case NETDEV_DOWN:
 646                 proc = lp->delete_address;
 647                 break;
 648         }
 649         if(proc != NULL){
 650                 addr_buf[0] = addr & 0xff;
 651                 addr_buf[1] = (addr >> 8) & 0xff;
 652                 addr_buf[2] = (addr >> 16) & 0xff;
 653                 addr_buf[3] = addr >> 24;
 654                 netmask_buf[0] = netmask & 0xff;
 655                 netmask_buf[1] = (netmask >> 8) & 0xff;
 656                 netmask_buf[2] = (netmask >> 16) & 0xff;
 657                 netmask_buf[3] = netmask >> 24;
 658                 (*proc)(addr_buf, netmask_buf, &lp->user);
 659         }
 660         return(NOTIFY_DONE);
 661 }
 662
 663 struct notifier_block uml_inetaddr_notifier = {
 664         .notifier_call          = uml_inetaddr_event,
 665 };
 666
 667 static int uml_net_init(void)
 668 {
 669         struct list_head *ele;
 670         struct uml_net_private *lp;
 671         struct in_device *ip;
 672         struct in_ifaddr *in;
 673
 674         mconsole_register_dev(&net_mc);
 675         register_inetaddr_notifier(&uml_inetaddr_notifier);
 676
 677         /* Devices may have been opened already, so the uml_inetaddr_notifier
 678          * didn't get a chance to run for them.  This fakes it so that
 679          * addresses which have already been set up get handled properly.
 680          */
 681         list_for_each(ele, &opened){
 682                 lp = list_entry(ele, struct uml_net_private, list);
 683                 ip = lp->dev->ip_ptr;
 684                 if(ip == NULL) continue;
 685                 in = ip->ifa_list;
 686                 while(in != NULL){
 687                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 688                         in = in->ifa_next;
 689                 }
 690         }
 691
 692         return(0);
 693 }
 694
 695 __initcall(uml_net_init);
 696
 697 static void close_devices(void)
 698 {
 699         struct list_head *ele;
 700         struct uml_net_private *lp;
 701
 702         list_for_each(ele, &opened){
 703                 lp = list_entry(ele, struct uml_net_private, list);
 704                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 705                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 706         }
 707 }
 708
 709 __uml_exitcall(close_devices);
 710
 711 int setup_etheraddr(char *str, unsigned char *addr)
 712 {
 713         char *end;
 714         int i;
 715
 716         if(str == NULL)
 717                 return(0);
 718         for(i=0;i<6;i++){
 719                 addr[i] = simple_strtoul(str, &end, 16);
 720                 if((end == str) ||
 721                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 722                         printk(KERN_ERR
 723                                "setup_etheraddr: failed to parse '%s' "
 724                                "as an ethernet address\n", str);
 725                         return(0);
 726                 }
 727                 str = end + 1;
 728         }
 729         if(addr[0] & 1){
 730                 printk(KERN_ERR
 731                        "Attempt to assign a broadcast ethernet address to a "
 732                        "device disallowed\n");
 733                 return(0);
 734         }
 735         return(1);
 736 }
 737
 738 void dev_ip_addr(void *d, char *buf, char *bin_buf)
 739 {
 740         struct net_device *dev = d;
 741         struct in_device *ip = dev->ip_ptr;
 742         struct in_ifaddr *in;
 743         u32 addr;
 744
 745         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 746                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 747                        "IP address\n");
 748                 return;
 749         }
 750         addr = in->ifa_address;
 751         sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff,
 752                 (addr >> 16) & 0xff, addr >> 24);
 753         if(bin_buf){
 754                 bin_buf[0] = addr & 0xff;
 755                 bin_buf[1] = (addr >> 8) & 0xff;
 756                 bin_buf[2] = (addr >> 16) & 0xff;
 757                 bin_buf[3] = addr >> 24;
 758         }
 759 }
 760
 761 void set_ether_mac(void *d, unsigned char *addr)
 762 {
 763         struct net_device *dev = d;
 764
 765         memcpy(dev->dev_addr, addr, ETH_ALEN);
 766 }
 767
 768 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 769 {
 770         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 771                 struct sk_buff *skb2;
 772
 773                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 774                 dev_kfree_skb(skb);
 775                 skb = skb2;
 776         }
 777         if(skb != NULL) skb_put(skb, extra);
 778         return(skb);
 779 }
 780
 781 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 782                                         void *),
 783                     void *arg)
 784 {
 785         struct net_device *dev = d;
 786         struct in_device *ip = dev->ip_ptr;
 787         struct in_ifaddr *in;
 788         unsigned char address[4], netmask[4];
 789
 790         if(ip == NULL) return;
 791         in = ip->ifa_list;
 792         while(in != NULL){
 793                 address[0] = in->ifa_address & 0xff;
 794                 address[1] = (in->ifa_address >> 8) & 0xff;
 795                 address[2] = (in->ifa_address >> 16) & 0xff;
 796                 address[3] = in->ifa_address >> 24;
 797                 netmask[0] = in->ifa_mask & 0xff;
 798                 netmask[1] = (in->ifa_mask >> 8) & 0xff;
 799                 netmask[2] = (in->ifa_mask >> 16) & 0xff;
 800                 netmask[3] = in->ifa_mask >> 24;
 801                 (*cb)(address, netmask, arg);
 802                 in = in->ifa_next;
 803         }
 804 }
 805
 806 int dev_netmask(void *d, void *m)
 807 {
 808         struct net_device *dev = d;
 809         struct in_device *ip = dev->ip_ptr;
 810         struct in_ifaddr *in;
 811         __u32 *mask_out = m;
 812
 813         if(ip == NULL)
 814                 return(1);
 815
 816         in = ip->ifa_list;
 817         if(in == NULL)
 818                 return(1);
 819
 820         *mask_out = in->ifa_mask;
 821         return(0);
 822 }
 823
 824 void *get_output_buffer(int *len_out)
 825 {
 826         void *ret;
 827
 828         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 829         if(ret) *len_out = PAGE_SIZE;
 830         else *len_out = 0;
 831         return(ret);
 832 }
 833
 834 void free_output_buffer(void *buffer)
 835 {
 836         free_pages((unsigned long) buffer, 0);
 837 }
 838
 839 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 840                      char **gate_addr)
 841 {
 842         char *remain;
 843
 844         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 845         if(remain != NULL){
 846                 printk("tap_setup_common - Extra garbage on specification : "
 847                        "'%s'\n", remain);
 848                 return(1);
 849         }
 850
 851         return(0);
 852 }
 853
 854 unsigned short eth_protocol(struct sk_buff *skb)
 855 {
 856         return(eth_type_trans(skb, skb->dev));
 857 }
 858
 859 /*
 860  * Overrides for Emacs so that we follow Linus's tabbing style.
 861  * Emacs will notice this stuff at the end of the file and automatically
 862  * adjust the settings for this buffer only.  This must remain at the end
 863  * of the file.
 864  * ---------------------------------------------------------------------------
 865  * Local variables:
 866  * c-file-style: "linux"
 867  * End:
 868  */