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 #define DRIVER_NAME "uml-netdev"
  34
  35 static DEFINE_SPINLOCK(opened_lock);
  36 LIST_HEAD(opened);
  37
  38 static int uml_net_rx(struct net_device *dev)
  39 {
  40         struct uml_net_private *lp = dev->priv;
  41         int pkt_len;
  42         struct sk_buff *skb;
  43
  44         /* If we can't allocate memory, try again next round. */
  45         skb = dev_alloc_skb(dev->mtu);
  46         if (skb == NULL) {
  47                 lp->stats.rx_dropped++;
  48                 return 0;
  49         }
  50
  51         skb->dev = dev;
  52         skb_put(skb, dev->mtu);
  53         skb->mac.raw = skb->data;
  54         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  55
  56         if (pkt_len > 0) {
  57                 skb_trim(skb, pkt_len);
  58                 skb->protocol = (*lp->protocol)(skb);
  59                 netif_rx(skb);
  60
  61                 lp->stats.rx_bytes += skb->len;
  62                 lp->stats.rx_packets++;
  63                 return pkt_len;
  64         }
  65
  66         kfree_skb(skb);
  67         return pkt_len;
  68 }
  69
  70 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  71 {
  72         struct net_device *dev = dev_id;
  73         struct uml_net_private *lp = dev->priv;
  74         int err;
  75
  76         if(!netif_running(dev))
  77                 return(IRQ_NONE);
  78
  79         spin_lock(&lp->lock);
  80         while((err = uml_net_rx(dev)) > 0) ;
  81         if(err < 0) {
  82                 printk(KERN_ERR
  83                        "Device '%s' read returned %d, shutting it down\n",
  84                        dev->name, err);
  85                 dev_close(dev);
  86                 goto out;
  87         }
  88         reactivate_fd(lp->fd, UM_ETH_IRQ);
  89
  90  out:
  91         spin_unlock(&lp->lock);
  92         return(IRQ_HANDLED);
  93 }
  94
  95 static int uml_net_open(struct net_device *dev)
  96 {
  97         struct uml_net_private *lp = dev->priv;
  98         char addr[sizeof("255.255.255.255\0")];
  99         int err;
 100
 101         spin_lock(&lp->lock);
 102
 103         if(lp->fd >= 0){
 104                 err = -ENXIO;
 105                 goto out;
 106         }
 107
 108         if(!lp->have_mac){
 109                 dev_ip_addr(dev, addr, &lp->mac[2]);
 110                 set_ether_mac(dev, lp->mac);
 111         }
 112
 113         lp->fd = (*lp->open)(&lp->user);
 114         if(lp->fd < 0){
 115                 err = lp->fd;
 116                 goto out;
 117         }
 118
 119         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 120                              SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
 121         if(err != 0){
 122                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 123                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 124                 lp->fd = -1;
 125                 err = -ENETUNREACH;
 126         }
 127
 128         lp->tl.data = (unsigned long) &lp->user;
 129         netif_start_queue(dev);
 130
 131         /* clear buffer - it can happen that the host side of the interface
 132          * is full when we get here.  In this case, new data is never queued,
 133          * SIGIOs never arrive, and the net never works.
 134          */
 135         while((err = uml_net_rx(dev)) > 0) ;
 136
 137  out:
 138         spin_unlock(&lp->lock);
 139         return(err);
 140 }
 141
 142 static int uml_net_close(struct net_device *dev)
 143 {
 144         struct uml_net_private *lp = dev->priv;
 145
 146         netif_stop_queue(dev);
 147         spin_lock(&lp->lock);
 148
 149         free_irq_by_irq_and_dev(dev->irq, dev);
 150         free_irq(dev->irq, dev);
 151         if(lp->close != NULL)
 152                 (*lp->close)(lp->fd, &lp->user);
 153         lp->fd = -1;
 154
 155         spin_unlock(&lp->lock);
 156         return 0;
 157 }
 158
 159 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 160 {
 161         struct uml_net_private *lp = dev->priv;
 162         unsigned long flags;
 163         int len;
 164
 165         netif_stop_queue(dev);
 166
 167         spin_lock_irqsave(&lp->lock, flags);
 168
 169         len = (*lp->write)(lp->fd, &skb, lp);
 170
 171         if(len == skb->len) {
 172                 lp->stats.tx_packets++;
 173                 lp->stats.tx_bytes += skb->len;
 174                 dev->trans_start = jiffies;
 175                 netif_start_queue(dev);
 176
 177                 /* this is normally done in the interrupt when tx finishes */
 178                 netif_wake_queue(dev);
 179         }
 180         else if(len == 0){
 181                 netif_start_queue(dev);
 182                 lp->stats.tx_dropped++;
 183         }
 184         else {
 185                 netif_start_queue(dev);
 186                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 187         }
 188
 189         spin_unlock_irqrestore(&lp->lock, flags);
 190
 191         dev_kfree_skb(skb);
 192
 193         return 0;
 194 }
 195
 196 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 197 {
 198         struct uml_net_private *lp = dev->priv;
 199         return &lp->stats;
 200 }
 201
 202 static void uml_net_set_multicast_list(struct net_device *dev)
 203 {
 204         if (dev->flags & IFF_PROMISC) return;
 205         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 206         else dev->flags &= ~IFF_ALLMULTI;
 207 }
 208
 209 static void uml_net_tx_timeout(struct net_device *dev)
 210 {
 211         dev->trans_start = jiffies;
 212         netif_wake_queue(dev);
 213 }
 214
 215 static int uml_net_set_mac(struct net_device *dev, void *addr)
 216 {
 217         struct uml_net_private *lp = dev->priv;
 218         struct sockaddr *hwaddr = addr;
 219
 220         spin_lock(&lp->lock);
 221         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
 222         spin_unlock(&lp->lock);
 223
 224         return(0);
 225 }
 226
 227 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 228 {
 229         struct uml_net_private *lp = dev->priv;
 230         int err = 0;
 231
 232         spin_lock(&lp->lock);
 233
 234         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 235         if(new_mtu < 0){
 236                 err = new_mtu;
 237                 goto out;
 238         }
 239
 240         dev->mtu = new_mtu;
 241
 242  out:
 243         spin_unlock(&lp->lock);
 244         return err;
 245 }
 246
 247 static int uml_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 248 {
 249         static const struct ethtool_drvinfo info = {
 250                 .cmd     = ETHTOOL_GDRVINFO,
 251                 .driver  = DRIVER_NAME,
 252                 .version = "42",
 253         };
 254         void *useraddr;
 255         u32 ethcmd;
 256
 257         switch (cmd) {
 258         case SIOCETHTOOL:
 259                 useraddr = ifr->ifr_data;
 260                 if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
 261                         return -EFAULT;
 262                 switch (ethcmd) {
 263                 case ETHTOOL_GDRVINFO:
 264                         if (copy_to_user(useraddr, &info, sizeof(info)))
 265                                 return -EFAULT;
 266                         return 0;
 267                 default:
 268                         return -EOPNOTSUPP;
 269                 }
 270         default:
 271                 return -EINVAL;
 272         }
 273 }
 274
 275 void uml_net_user_timer_expire(unsigned long _conn)
 276 {
 277 #ifdef undef
 278         struct connection *conn = (struct connection *)_conn;
 279
 280         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 281         do_connect(conn);
 282 #endif
 283 }
 284
 285 static DEFINE_SPINLOCK(devices_lock);
 286 static struct list_head devices = LIST_HEAD_INIT(devices);
 287
 288 static struct device_driver uml_net_driver = {
 289         .name  = DRIVER_NAME,
 290         .bus   = &platform_bus_type,
 291 };
 292 static int driver_registered;
 293
 294 static int eth_configure(int n, void *init, char *mac,
 295                          struct transport *transport)
 296 {
 297         struct uml_net *device;
 298         struct net_device *dev;
 299         struct uml_net_private *lp;
 300         int save, err, size;
 301
 302         size = transport->private_size + sizeof(struct uml_net_private) +
 303                 sizeof(((struct uml_net_private *) 0)->user);
 304
 305         device = kmalloc(sizeof(*device), GFP_KERNEL);
 306         if (device == NULL) {
 307                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 308                 return(1);
 309         }
 310
 311         memset(device, 0, sizeof(*device));
 312         INIT_LIST_HEAD(&device->list);
 313         device->index = n;
 314
 315         spin_lock(&devices_lock);
 316         list_add(&device->list, &devices);
 317         spin_unlock(&devices_lock);
 318
 319         if (setup_etheraddr(mac, device->mac))
 320                 device->have_mac = 1;
 321
 322         printk(KERN_INFO "Netdevice %d ", n);
 323         if (device->have_mac)
 324                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 325                        device->mac[0], device->mac[1],
 326                        device->mac[2], device->mac[3],
 327                        device->mac[4], device->mac[5]);
 328         printk(": ");
 329         dev = alloc_etherdev(size);
 330         if (dev == NULL) {
 331                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 332                 return 1;
 333         }
 334
 335         /* sysfs register */
 336         if (!driver_registered) {
 337                 driver_register(&uml_net_driver);
 338                 driver_registered = 1;
 339         }
 340         device->pdev.id = n;
 341         device->pdev.name = DRIVER_NAME;
 342         platform_device_register(&device->pdev);
 343         SET_NETDEV_DEV(dev,&device->pdev.dev);
 344
 345         /* If this name ends up conflicting with an existing registered
 346          * netdevice, that is OK, register_netdev{,ice}() will notice this
 347          * and fail.
 348          */
 349         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 350         device->dev = dev;
 351
 352         (*transport->kern->init)(dev, init);
 353
 354         dev->mtu = transport->user->max_packet;
 355         dev->open = uml_net_open;
 356         dev->hard_start_xmit = uml_net_start_xmit;
 357         dev->stop = uml_net_close;
 358         dev->get_stats = uml_net_get_stats;
 359         dev->set_multicast_list = uml_net_set_multicast_list;
 360         dev->tx_timeout = uml_net_tx_timeout;
 361         dev->set_mac_address = uml_net_set_mac;
 362         dev->change_mtu = uml_net_change_mtu;
 363         dev->do_ioctl = uml_net_ioctl;
 364         dev->watchdog_timeo = (HZ >> 1);
 365         dev->irq = UM_ETH_IRQ;
 366
 367         rtnl_lock();
 368         err = register_netdevice(dev);
 369         rtnl_unlock();
 370         if (err) {
 371                 device->dev = NULL;
 372                 /* XXX: should we call ->remove() here? */
 373                 free_netdev(dev);
 374                 return 1;
 375         }
 376         lp = dev->priv;
 377
 378         /* lp.user is the first four bytes of the transport data, which
 379          * has already been initialized.  This structure assignment will
 380          * overwrite that, so we make sure that .user gets overwritten with
 381          * what it already has.
 382          */
 383         save = lp->user[0];
 384         *lp = ((struct uml_net_private)
 385                 { .list                 = LIST_HEAD_INIT(lp->list),
 386                   .dev                  = dev,
 387                   .fd                   = -1,
 388                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 389                   .have_mac             = device->have_mac,
 390                   .protocol             = transport->kern->protocol,
 391                   .open                 = transport->user->open,
 392                   .close                = transport->user->close,
 393                   .remove               = transport->user->remove,
 394                   .read                 = transport->kern->read,
 395                   .write                = transport->kern->write,
 396                   .add_address          = transport->user->add_address,
 397                   .delete_address       = transport->user->delete_address,
 398                   .set_mtu              = transport->user->set_mtu,
 399                   .user                 = { save } });
 400
 401         init_timer(&lp->tl);
 402         spin_lock_init(&lp->lock);
 403         lp->tl.function = uml_net_user_timer_expire;
 404         if (lp->have_mac)
 405                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 406
 407         if (transport->user->init)
 408                 (*transport->user->init)(&lp->user, dev);
 409
 410         if (device->have_mac)
 411                 set_ether_mac(dev, device->mac);
 412
 413         spin_lock(&opened_lock);
 414         list_add(&lp->list, &opened);
 415         spin_unlock(&opened_lock);
 416
 417         return(0);
 418 }
 419
 420 static struct uml_net *find_device(int n)
 421 {
 422         struct uml_net *device;
 423         struct list_head *ele;
 424
 425         spin_lock(&devices_lock);
 426         list_for_each(ele, &devices){
 427                 device = list_entry(ele, struct uml_net, list);
 428                 if(device->index == n)
 429                         goto out;
 430         }
 431         device = NULL;
 432  out:
 433         spin_unlock(&devices_lock);
 434         return(device);
 435 }
 436
 437 static int eth_parse(char *str, int *index_out, char **str_out)
 438 {
 439         char *end;
 440         int n;
 441
 442         n = simple_strtoul(str, &end, 0);
 443         if(end == str){
 444                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 445                 return(1);
 446         }
 447         if(n < 0){
 448                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 449                 return(1);
 450         }
 451         str = end;
 452         if(*str != '='){
 453                 printk(KERN_ERR
 454                        "eth_setup: expected '=' after device number\n");
 455                 return(1);
 456         }
 457         str++;
 458         if(find_device(n)){
 459                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 460                        n);
 461                 return(1);
 462         }
 463         if(index_out) *index_out = n;
 464         *str_out = str;
 465         return(0);
 466 }
 467
 468 struct eth_init {
 469         struct list_head list;
 470         char *init;
 471         int index;
 472 };
 473
 474 /* Filled in at boot time.  Will need locking if the transports become
 475  * modular.
 476  */
 477 struct list_head transports = LIST_HEAD_INIT(transports);
 478
 479 /* Filled in during early boot */
 480 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 481
 482 static int check_transport(struct transport *transport, char *eth, int n,
 483                            void **init_out, char **mac_out)
 484 {
 485         int len;
 486
 487         len = strlen(transport->name);
 488         if(strncmp(eth, transport->name, len))
 489                 return(0);
 490
 491         eth += len;
 492         if(*eth == ',')
 493                 eth++;
 494         else if(*eth != '\0')
 495                 return(0);
 496
 497         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 498         if(*init_out == NULL)
 499                 return(1);
 500
 501         if(!transport->setup(eth, mac_out, *init_out)){
 502                 kfree(*init_out);
 503                 *init_out = NULL;
 504         }
 505         return(1);
 506 }
 507
 508 void register_transport(struct transport *new)
 509 {
 510         struct list_head *ele, *next;
 511         struct eth_init *eth;
 512         void *init;
 513         char *mac = NULL;
 514         int match;
 515
 516         list_add(&new->list, &transports);
 517
 518         list_for_each_safe(ele, next, &eth_cmd_line){
 519                 eth = list_entry(ele, struct eth_init, list);
 520                 match = check_transport(new, eth->init, eth->index, &init,
 521                                         &mac);
 522                 if(!match)
 523                         continue;
 524                 else if(init != NULL){
 525                         eth_configure(eth->index, init, mac, new);
 526                         kfree(init);
 527                 }
 528                 list_del(&eth->list);
 529         }
 530 }
 531
 532 static int eth_setup_common(char *str, int index)
 533 {
 534         struct list_head *ele;
 535         struct transport *transport;
 536         void *init;
 537         char *mac = NULL;
 538
 539         list_for_each(ele, &transports){
 540                 transport = list_entry(ele, struct transport, list);
 541                 if(!check_transport(transport, str, index, &init, &mac))
 542                         continue;
 543                 if(init != NULL){
 544                         eth_configure(index, init, mac, transport);
 545                         kfree(init);
 546                 }
 547                 return(1);
 548         }
 549         return(0);
 550 }
 551
 552 static int eth_setup(char *str)
 553 {
 554         struct eth_init *new;
 555         int n, err;
 556
 557         err = eth_parse(str, &n, &str);
 558         if(err) return(1);
 559
 560         new = alloc_bootmem(sizeof(new));
 561         if (new == NULL){
 562                 printk("eth_init : alloc_bootmem failed\n");
 563                 return(1);
 564         }
 565
 566         INIT_LIST_HEAD(&new->list);
 567         new->index = n;
 568         new->init = str;
 569
 570         list_add_tail(&new->list, &eth_cmd_line);
 571         return(1);
 572 }
 573
 574 __setup("eth", eth_setup);
 575 __uml_help(eth_setup,
 576 "eth[0-9]+=<transport>,<options>\n"
 577 "    Configure a network device.\n\n"
 578 );
 579
 580 #if 0
 581 static int eth_init(void)
 582 {
 583         struct list_head *ele, *next;
 584         struct eth_init *eth;
 585
 586         list_for_each_safe(ele, next, &eth_cmd_line){
 587                 eth = list_entry(ele, struct eth_init, list);
 588
 589                 if(eth_setup_common(eth->init, eth->index))
 590                         list_del(&eth->list);
 591         }
 592
 593         return(1);
 594 }
 595 __initcall(eth_init);
 596 #endif
 597
 598 static int net_config(char *str)
 599 {
 600         int n, err;
 601
 602         err = eth_parse(str, &n, &str);
 603         if(err) return(err);
 604
 605         str = uml_strdup(str);
 606         if(str == NULL){
 607                 printk(KERN_ERR "net_config failed to strdup string\n");
 608                 return(-1);
 609         }
 610         err = !eth_setup_common(str, n);
 611         if(err)
 612                 kfree(str);
 613         return(err);
 614 }
 615
 616 static int net_remove(char *str)
 617 {
 618         struct uml_net *device;
 619         struct net_device *dev;
 620         struct uml_net_private *lp;
 621         char *end;
 622         int n;
 623
 624         n = simple_strtoul(str, &end, 0);
 625         if((*end != '\0') || (end == str))
 626                 return(-1);
 627
 628         device = find_device(n);
 629         if(device == NULL)
 630                 return(0);
 631
 632         dev = device->dev;
 633         lp = dev->priv;
 634         if(lp->fd > 0) return(-1);
 635         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 636         unregister_netdev(dev);
 637         platform_device_unregister(&device->pdev);
 638
 639         list_del(&device->list);
 640         kfree(device);
 641         free_netdev(dev);
 642         return(0);
 643 }
 644
 645 static struct mc_device net_mc = {
 646         .name           = "eth",
 647         .config         = net_config,
 648         .get_config     = NULL,
 649         .remove         = net_remove,
 650 };
 651
 652 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 653                               void *ptr)
 654 {
 655         struct in_ifaddr *ifa = ptr;
 656         u32 addr = ifa->ifa_address;
 657         u32 netmask = ifa->ifa_mask;
 658         struct net_device *dev = ifa->ifa_dev->dev;
 659         struct uml_net_private *lp;
 660         void (*proc)(unsigned char *, unsigned char *, void *);
 661         unsigned char addr_buf[4], netmask_buf[4];
 662
 663         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 664
 665         lp = dev->priv;
 666
 667         proc = NULL;
 668         switch (event){
 669         case NETDEV_UP:
 670                 proc = lp->add_address;
 671                 break;
 672         case NETDEV_DOWN:
 673                 proc = lp->delete_address;
 674                 break;
 675         }
 676         if(proc != NULL){
 677                 addr_buf[0] = addr & 0xff;
 678                 addr_buf[1] = (addr >> 8) & 0xff;
 679                 addr_buf[2] = (addr >> 16) & 0xff;
 680                 addr_buf[3] = addr >> 24;
 681                 netmask_buf[0] = netmask & 0xff;
 682                 netmask_buf[1] = (netmask >> 8) & 0xff;
 683                 netmask_buf[2] = (netmask >> 16) & 0xff;
 684                 netmask_buf[3] = netmask >> 24;
 685                 (*proc)(addr_buf, netmask_buf, &lp->user);
 686         }
 687         return(NOTIFY_DONE);
 688 }
 689
 690 struct notifier_block uml_inetaddr_notifier = {
 691         .notifier_call          = uml_inetaddr_event,
 692 };
 693
 694 static int uml_net_init(void)
 695 {
 696         struct list_head *ele;
 697         struct uml_net_private *lp;
 698         struct in_device *ip;
 699         struct in_ifaddr *in;
 700
 701         mconsole_register_dev(&net_mc);
 702         register_inetaddr_notifier(&uml_inetaddr_notifier);
 703
 704         /* Devices may have been opened already, so the uml_inetaddr_notifier
 705          * didn't get a chance to run for them.  This fakes it so that
 706          * addresses which have already been set up get handled properly.
 707          */
 708         list_for_each(ele, &opened){
 709                 lp = list_entry(ele, struct uml_net_private, list);
 710                 ip = lp->dev->ip_ptr;
 711                 if(ip == NULL) continue;
 712                 in = ip->ifa_list;
 713                 while(in != NULL){
 714                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 715                         in = in->ifa_next;
 716                 }
 717         }
 718
 719         return(0);
 720 }
 721
 722 __initcall(uml_net_init);
 723
 724 static void close_devices(void)
 725 {
 726         struct list_head *ele;
 727         struct uml_net_private *lp;
 728
 729         list_for_each(ele, &opened){
 730                 lp = list_entry(ele, struct uml_net_private, list);
 731                 if((lp->close != NULL) && (lp->fd >= 0))
 732                         (*lp->close)(lp->fd, &lp->user);
 733                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 734         }
 735 }
 736
 737 __uml_exitcall(close_devices);
 738
 739 int setup_etheraddr(char *str, unsigned char *addr)
 740 {
 741         char *end;
 742         int i;
 743
 744         if(str == NULL)
 745                 return(0);
 746         for(i=0;i<6;i++){
 747                 addr[i] = simple_strtoul(str, &end, 16);
 748                 if((end == str) ||
 749                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 750                         printk(KERN_ERR
 751                                "setup_etheraddr: failed to parse '%s' "
 752                                "as an ethernet address\n", str);
 753                         return(0);
 754                 }
 755                 str = end + 1;
 756         }
 757         if(addr[0] & 1){
 758                 printk(KERN_ERR
 759                        "Attempt to assign a broadcast ethernet address to a "
 760                        "device disallowed\n");
 761                 return(0);
 762         }
 763         return(1);
 764 }
 765
 766 void dev_ip_addr(void *d, char *buf, char *bin_buf)
 767 {
 768         struct net_device *dev = d;
 769         struct in_device *ip = dev->ip_ptr;
 770         struct in_ifaddr *in;
 771         u32 addr;
 772
 773         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 774                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 775                        "IP address\n");
 776                 return;
 777         }
 778         addr = in->ifa_address;
 779         sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff,
 780                 (addr >> 16) & 0xff, addr >> 24);
 781         if(bin_buf){
 782                 bin_buf[0] = addr & 0xff;
 783                 bin_buf[1] = (addr >> 8) & 0xff;
 784                 bin_buf[2] = (addr >> 16) & 0xff;
 785                 bin_buf[3] = addr >> 24;
 786         }
 787 }
 788
 789 void set_ether_mac(void *d, unsigned char *addr)
 790 {
 791         struct net_device *dev = d;
 792
 793         memcpy(dev->dev_addr, addr, ETH_ALEN);
 794 }
 795
 796 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 797 {
 798         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 799                 struct sk_buff *skb2;
 800
 801                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 802                 dev_kfree_skb(skb);
 803                 skb = skb2;
 804         }
 805         if(skb != NULL) skb_put(skb, extra);
 806         return(skb);
 807 }
 808
 809 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 810                                         void *),
 811                     void *arg)
 812 {
 813         struct net_device *dev = d;
 814         struct in_device *ip = dev->ip_ptr;
 815         struct in_ifaddr *in;
 816         unsigned char address[4], netmask[4];
 817
 818         if(ip == NULL) return;
 819         in = ip->ifa_list;
 820         while(in != NULL){
 821                 address[0] = in->ifa_address & 0xff;
 822                 address[1] = (in->ifa_address >> 8) & 0xff;
 823                 address[2] = (in->ifa_address >> 16) & 0xff;
 824                 address[3] = in->ifa_address >> 24;
 825                 netmask[0] = in->ifa_mask & 0xff;
 826                 netmask[1] = (in->ifa_mask >> 8) & 0xff;
 827                 netmask[2] = (in->ifa_mask >> 16) & 0xff;
 828                 netmask[3] = in->ifa_mask >> 24;
 829                 (*cb)(address, netmask, arg);
 830                 in = in->ifa_next;
 831         }
 832 }
 833
 834 int dev_netmask(void *d, void *m)
 835 {
 836         struct net_device *dev = d;
 837         struct in_device *ip = dev->ip_ptr;
 838         struct in_ifaddr *in;
 839         __u32 *mask_out = m;
 840
 841         if(ip == NULL)
 842                 return(1);
 843
 844         in = ip->ifa_list;
 845         if(in == NULL)
 846                 return(1);
 847
 848         *mask_out = in->ifa_mask;
 849         return(0);
 850 }
 851
 852 void *get_output_buffer(int *len_out)
 853 {
 854         void *ret;
 855
 856         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 857         if(ret) *len_out = PAGE_SIZE;
 858         else *len_out = 0;
 859         return(ret);
 860 }
 861
 862 void free_output_buffer(void *buffer)
 863 {
 864         free_pages((unsigned long) buffer, 0);
 865 }
 866
 867 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 868                      char **gate_addr)
 869 {
 870         char *remain;
 871
 872         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 873         if(remain != NULL){
 874                 printk("tap_setup_common - Extra garbage on specification : "
 875                        "'%s'\n", remain);
 876                 return(1);
 877         }
 878
 879         return(0);
 880 }
 881
 882 unsigned short eth_protocol(struct sk_buff *skb)
 883 {
 884         return(eth_type_trans(skb, skb->dev));
 885 }
 886
 887 /*
 888  * Overrides for Emacs so that we follow Linus's tabbing style.
 889  * Emacs will notice this stuff at the end of the file and automatically
 890  * adjust the settings for this buffer only.  This must remain at the end
 891  * of the file.
 892  * ---------------------------------------------------------------------------
 893  * Local variables:
 894  * c-file-style: "linux"
 895  * End:
 896  */