git.oblomov.eu Git - linux-2.6/blob - 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 "linux/platform_device.h"
  24 #include "asm/uaccess.h"
  25 #include "user_util.h"
  26 #include "kern_util.h"
  27 #include "net_kern.h"
  28 #include "net_user.h"
  29 #include "mconsole_kern.h"
  30 #include "init.h"
  31 #include "irq_user.h"
  32 #include "irq_kern.h"
  33
  34 #define DRIVER_NAME "uml-netdev"
  35
  36 static DEFINE_SPINLOCK(opened_lock);
  37 LIST_HEAD(opened);
  38
  39 static int uml_net_rx(struct net_device *dev)
  40 {
  41         struct uml_net_private *lp = dev->priv;
  42         int pkt_len;
  43         struct sk_buff *skb;
  44
  45         /* If we can't allocate memory, try again next round. */
  46         skb = dev_alloc_skb(dev->mtu);
  47         if (skb == NULL) {
  48                 lp->stats.rx_dropped++;
  49                 return 0;
  50         }
  51
  52         skb->dev = dev;
  53         skb_put(skb, dev->mtu);
  54         skb->mac.raw = skb->data;
  55         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  56
  57         if (pkt_len > 0) {
  58                 skb_trim(skb, pkt_len);
  59                 skb->protocol = (*lp->protocol)(skb);
  60                 netif_rx(skb);
  61
  62                 lp->stats.rx_bytes += skb->len;
  63                 lp->stats.rx_packets++;
  64                 return pkt_len;
  65         }
  66
  67         kfree_skb(skb);
  68         return pkt_len;
  69 }
  70
  71 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  72 {
  73         struct net_device *dev = dev_id;
  74         struct uml_net_private *lp = dev->priv;
  75         int err;
  76
  77         if(!netif_running(dev))
  78                 return(IRQ_NONE);
  79
  80         spin_lock(&lp->lock);
  81         while((err = uml_net_rx(dev)) > 0) ;
  82         if(err < 0) {
  83                 printk(KERN_ERR
  84                        "Device '%s' read returned %d, shutting it down\n",
  85                        dev->name, err);
  86                 dev_close(dev);
  87                 goto out;
  88         }
  89         reactivate_fd(lp->fd, UM_ETH_IRQ);
  90
  91  out:
  92         spin_unlock(&lp->lock);
  93         return(IRQ_HANDLED);
  94 }
  95
  96 static int uml_net_open(struct net_device *dev)
  97 {
  98         struct uml_net_private *lp = dev->priv;
  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, &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(dev->irq, dev);
 150         if(lp->close != NULL)
 151                 (*lp->close)(lp->fd, &lp->user);
 152         lp->fd = -1;
 153
 154         spin_unlock(&lp->lock);
 155         return 0;
 156 }
 157
 158 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 159 {
 160         struct uml_net_private *lp = dev->priv;
 161         unsigned long flags;
 162         int len;
 163
 164         netif_stop_queue(dev);
 165
 166         spin_lock_irqsave(&lp->lock, flags);
 167
 168         len = (*lp->write)(lp->fd, &skb, lp);
 169
 170         if(len == skb->len) {
 171                 lp->stats.tx_packets++;
 172                 lp->stats.tx_bytes += skb->len;
 173                 dev->trans_start = jiffies;
 174                 netif_start_queue(dev);
 175
 176                 /* this is normally done in the interrupt when tx finishes */
 177                 netif_wake_queue(dev);
 178         }
 179         else if(len == 0){
 180                 netif_start_queue(dev);
 181                 lp->stats.tx_dropped++;
 182         }
 183         else {
 184                 netif_start_queue(dev);
 185                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 186         }
 187
 188         spin_unlock_irqrestore(&lp->lock, flags);
 189
 190         dev_kfree_skb(skb);
 191
 192         return 0;
 193 }
 194
 195 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 196 {
 197         struct uml_net_private *lp = dev->priv;
 198         return &lp->stats;
 199 }
 200
 201 static void uml_net_set_multicast_list(struct net_device *dev)
 202 {
 203         if (dev->flags & IFF_PROMISC) return;
 204         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 205         else dev->flags &= ~IFF_ALLMULTI;
 206 }
 207
 208 static void uml_net_tx_timeout(struct net_device *dev)
 209 {
 210         dev->trans_start = jiffies;
 211         netif_wake_queue(dev);
 212 }
 213
 214 static int uml_net_set_mac(struct net_device *dev, void *addr)
 215 {
 216         struct uml_net_private *lp = dev->priv;
 217         struct sockaddr *hwaddr = addr;
 218
 219         spin_lock(&lp->lock);
 220         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
 221         spin_unlock(&lp->lock);
 222
 223         return(0);
 224 }
 225
 226 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 227 {
 228         struct uml_net_private *lp = dev->priv;
 229         int err = 0;
 230
 231         spin_lock(&lp->lock);
 232
 233         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 234         if(new_mtu < 0){
 235                 err = new_mtu;
 236                 goto out;
 237         }
 238
 239         dev->mtu = new_mtu;
 240
 241  out:
 242         spin_unlock(&lp->lock);
 243         return err;
 244 }
 245
 246 static int uml_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 247 {
 248         static const struct ethtool_drvinfo info = {
 249                 .cmd     = ETHTOOL_GDRVINFO,
 250                 .driver  = DRIVER_NAME,
 251                 .version = "42",
 252         };
 253         void *useraddr;
 254         u32 ethcmd;
 255
 256         switch (cmd) {
 257         case SIOCETHTOOL:
 258                 useraddr = ifr->ifr_data;
 259                 if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
 260                         return -EFAULT;
 261                 switch (ethcmd) {
 262                 case ETHTOOL_GDRVINFO:
 263                         if (copy_to_user(useraddr, &info, sizeof(info)))
 264                                 return -EFAULT;
 265                         return 0;
 266                 default:
 267                         return -EOPNOTSUPP;
 268                 }
 269         default:
 270                 return -EINVAL;
 271         }
 272 }
 273
 274 void uml_net_user_timer_expire(unsigned long _conn)
 275 {
 276 #ifdef undef
 277         struct connection *conn = (struct connection *)_conn;
 278
 279         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 280         do_connect(conn);
 281 #endif
 282 }
 283
 284 static DEFINE_SPINLOCK(devices_lock);
 285 static struct list_head devices = LIST_HEAD_INIT(devices);
 286
 287 static struct device_driver uml_net_driver = {
 288         .name  = DRIVER_NAME,
 289         .bus   = &platform_bus_type,
 290 };
 291 static int driver_registered;
 292
 293 static int eth_configure(int n, void *init, char *mac,
 294                          struct transport *transport)
 295 {
 296         struct uml_net *device;
 297         struct net_device *dev;
 298         struct uml_net_private *lp;
 299         int save, err, size;
 300
 301         size = transport->private_size + sizeof(struct uml_net_private) +
 302                 sizeof(((struct uml_net_private *) 0)->user);
 303
 304         device = kmalloc(sizeof(*device), GFP_KERNEL);
 305         if (device == NULL) {
 306                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 307                 return(1);
 308         }
 309
 310         memset(device, 0, sizeof(*device));
 311         INIT_LIST_HEAD(&device->list);
 312         device->index = n;
 313
 314         spin_lock(&devices_lock);
 315         list_add(&device->list, &devices);
 316         spin_unlock(&devices_lock);
 317
 318         if (setup_etheraddr(mac, device->mac))
 319                 device->have_mac = 1;
 320
 321         printk(KERN_INFO "Netdevice %d ", n);
 322         if (device->have_mac)
 323                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 324                        device->mac[0], device->mac[1],
 325                        device->mac[2], device->mac[3],
 326                        device->mac[4], device->mac[5]);
 327         printk(": ");
 328         dev = alloc_etherdev(size);
 329         if (dev == NULL) {
 330                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 331                 return 1;
 332         }
 333
 334         /* sysfs register */
 335         if (!driver_registered) {
 336                 driver_register(&uml_net_driver);
 337                 driver_registered = 1;
 338         }
 339         device->pdev.id = n;
 340         device->pdev.name = DRIVER_NAME;
 341         platform_device_register(&device->pdev);
 342         SET_NETDEV_DEV(dev,&device->pdev.dev);
 343
 344         /* If this name ends up conflicting with an existing registered
 345          * netdevice, that is OK, register_netdev{,ice}() will notice this
 346          * and fail.
 347          */
 348         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 349         device->dev = dev;
 350
 351         (*transport->kern->init)(dev, init);
 352
 353         dev->mtu = transport->user->max_packet;
 354         dev->open = uml_net_open;
 355         dev->hard_start_xmit = uml_net_start_xmit;
 356         dev->stop = uml_net_close;
 357         dev->get_stats = uml_net_get_stats;
 358         dev->set_multicast_list = uml_net_set_multicast_list;
 359         dev->tx_timeout = uml_net_tx_timeout;
 360         dev->set_mac_address = uml_net_set_mac;
 361         dev->change_mtu = uml_net_change_mtu;
 362         dev->do_ioctl = uml_net_ioctl;
 363         dev->watchdog_timeo = (HZ >> 1);
 364         dev->irq = UM_ETH_IRQ;
 365
 366         rtnl_lock();
 367         err = register_netdevice(dev);
 368         rtnl_unlock();
 369         if (err) {
 370                 device->dev = NULL;
 371                 /* XXX: should we call ->remove() here? */
 372                 free_netdev(dev);
 373                 return 1;
 374         }
 375         lp = dev->priv;
 376
 377         /* lp.user is the first four bytes of the transport data, which
 378          * has already been initialized.  This structure assignment will
 379          * overwrite that, so we make sure that .user gets overwritten with
 380          * what it already has.
 381          */
 382         save = lp->user[0];
 383         *lp = ((struct uml_net_private)
 384                 { .list                 = LIST_HEAD_INIT(lp->list),
 385                   .dev                  = dev,
 386                   .fd                   = -1,
 387                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 388                   .have_mac             = device->have_mac,
 389                   .protocol             = transport->kern->protocol,
 390                   .open                 = transport->user->open,
 391                   .close                = transport->user->close,
 392                   .remove               = transport->user->remove,
 393                   .read                 = transport->kern->read,
 394                   .write                = transport->kern->write,
 395                   .add_address          = transport->user->add_address,
 396                   .delete_address       = transport->user->delete_address,
 397                   .set_mtu              = transport->user->set_mtu,
 398                   .user                 = { save } });
 399
 400         init_timer(&lp->tl);
 401         spin_lock_init(&lp->lock);
 402         lp->tl.function = uml_net_user_timer_expire;
 403         if (lp->have_mac)
 404                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 405
 406         if (transport->user->init)
 407                 (*transport->user->init)(&lp->user, dev);
 408
 409         if (device->have_mac)
 410                 set_ether_mac(dev, device->mac);
 411
 412         spin_lock(&opened_lock);
 413         list_add(&lp->list, &opened);
 414         spin_unlock(&opened_lock);
 415
 416         return(0);
 417 }
 418
 419 static struct uml_net *find_device(int n)
 420 {
 421         struct uml_net *device;
 422         struct list_head *ele;
 423
 424         spin_lock(&devices_lock);
 425         list_for_each(ele, &devices){
 426                 device = list_entry(ele, struct uml_net, list);
 427                 if(device->index == n)
 428                         goto out;
 429         }
 430         device = NULL;
 431  out:
 432         spin_unlock(&devices_lock);
 433         return(device);
 434 }
 435
 436 static int eth_parse(char *str, int *index_out, char **str_out)
 437 {
 438         char *end;
 439         int n;
 440
 441         n = simple_strtoul(str, &end, 0);
 442         if(end == str){
 443                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 444                 return(1);
 445         }
 446         if(n < 0){
 447                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 448                 return(1);
 449         }
 450         str = end;
 451         if(*str != '='){
 452                 printk(KERN_ERR
 453                        "eth_setup: expected '=' after device number\n");
 454                 return(1);
 455         }
 456         str++;
 457         if(find_device(n)){
 458                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 459                        n);
 460                 return(1);
 461         }
 462         if(index_out) *index_out = n;
 463         *str_out = str;
 464         return(0);
 465 }
 466
 467 struct eth_init {
 468         struct list_head list;
 469         char *init;
 470         int index;
 471 };
 472
 473 /* Filled in at boot time.  Will need locking if the transports become
 474  * modular.
 475  */
 476 struct list_head transports = LIST_HEAD_INIT(transports);
 477
 478 /* Filled in during early boot */
 479 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 480
 481 static int check_transport(struct transport *transport, char *eth, int n,
 482                            void **init_out, char **mac_out)
 483 {
 484         int len;
 485
 486         len = strlen(transport->name);
 487         if(strncmp(eth, transport->name, len))
 488                 return(0);
 489
 490         eth += len;
 491         if(*eth == ',')
 492                 eth++;
 493         else if(*eth != '\0')
 494                 return(0);
 495
 496         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 497         if(*init_out == NULL)
 498                 return(1);
 499
 500         if(!transport->setup(eth, mac_out, *init_out)){
 501                 kfree(*init_out);
 502                 *init_out = NULL;
 503         }
 504         return(1);
 505 }
 506
 507 void register_transport(struct transport *new)
 508 {
 509         struct list_head *ele, *next;
 510         struct eth_init *eth;
 511         void *init;
 512         char *mac = NULL;
 513         int match;
 514
 515         list_add(&new->list, &transports);
 516
 517         list_for_each_safe(ele, next, &eth_cmd_line){
 518                 eth = list_entry(ele, struct eth_init, list);
 519                 match = check_transport(new, eth->init, eth->index, &init,
 520                                         &mac);
 521                 if(!match)
 522                         continue;
 523                 else if(init != NULL){
 524                         eth_configure(eth->index, init, mac, new);
 525                         kfree(init);
 526                 }
 527                 list_del(&eth->list);
 528         }
 529 }
 530
 531 static int eth_setup_common(char *str, int index)
 532 {
 533         struct list_head *ele;
 534         struct transport *transport;
 535         void *init;
 536         char *mac = NULL;
 537
 538         list_for_each(ele, &transports){
 539                 transport = list_entry(ele, struct transport, list);
 540                 if(!check_transport(transport, str, index, &init, &mac))
 541                         continue;
 542                 if(init != NULL){
 543                         eth_configure(index, init, mac, transport);
 544                         kfree(init);
 545                 }
 546                 return(1);
 547         }
 548         return(0);
 549 }
 550
 551 static int eth_setup(char *str)
 552 {
 553         struct eth_init *new;
 554         int n, err;
 555
 556         err = eth_parse(str, &n, &str);
 557         if(err) return(1);
 558
 559         new = alloc_bootmem(sizeof(new));
 560         if (new == NULL){
 561                 printk("eth_init : alloc_bootmem failed\n");
 562                 return(1);
 563         }
 564
 565         INIT_LIST_HEAD(&new->list);
 566         new->index = n;
 567         new->init = str;
 568
 569         list_add_tail(&new->list, &eth_cmd_line);
 570         return(1);
 571 }
 572
 573 __setup("eth", eth_setup);
 574 __uml_help(eth_setup,
 575 "eth[0-9]+=<transport>,<options>\n"
 576 "    Configure a network device.\n\n"
 577 );
 578
 579 #if 0
 580 static int eth_init(void)
 581 {
 582         struct list_head *ele, *next;
 583         struct eth_init *eth;
 584
 585         list_for_each_safe(ele, next, &eth_cmd_line){
 586                 eth = list_entry(ele, struct eth_init, list);
 587
 588                 if(eth_setup_common(eth->init, eth->index))
 589                         list_del(&eth->list);
 590         }
 591
 592         return(1);
 593 }
 594 __initcall(eth_init);
 595 #endif
 596
 597 static int net_config(char *str)
 598 {
 599         int n, err;
 600
 601         err = eth_parse(str, &n, &str);
 602         if(err) return(err);
 603
 604         str = uml_strdup(str);
 605         if(str == NULL){
 606                 printk(KERN_ERR "net_config failed to strdup string\n");
 607                 return(-1);
 608         }
 609         err = !eth_setup_common(str, n);
 610         if(err)
 611                 kfree(str);
 612         return(err);
 613 }
 614
 615 static int net_id(char **str, int *start_out, int *end_out)
 616 {
 617         char *end;
 618         int n;
 619
 620         n = simple_strtoul(*str, &end, 0);
 621         if((*end != '\0') || (end == *str))
 622                 return -1;
 623
 624         *start_out = n;
 625         *end_out = n;
 626         *str = end;
 627         return n;
 628 }
 629
 630 static int net_remove(int n)
 631 {
 632         struct uml_net *device;
 633         struct net_device *dev;
 634         struct uml_net_private *lp;
 635
 636         device = find_device(n);
 637         if(device == NULL)
 638                 return -ENODEV;
 639
 640         dev = device->dev;
 641         lp = dev->priv;
 642         if(lp->fd > 0)
 643                 return -EBUSY;
 644         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 645         unregister_netdev(dev);
 646         platform_device_unregister(&device->pdev);
 647
 648         list_del(&device->list);
 649         kfree(device);
 650         free_netdev(dev);
 651         return 0;
 652 }
 653
 654 static struct mc_device net_mc = {
 655         .name           = "eth",
 656         .config         = net_config,
 657         .get_config     = NULL,
 658         .id             = net_id,
 659         .remove         = net_remove,
 660 };
 661
 662 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 663                               void *ptr)
 664 {
 665         struct in_ifaddr *ifa = ptr;
 666         struct net_device *dev = ifa->ifa_dev->dev;
 667         struct uml_net_private *lp;
 668         void (*proc)(unsigned char *, unsigned char *, void *);
 669         unsigned char addr_buf[4], netmask_buf[4];
 670
 671         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 672
 673         lp = dev->priv;
 674
 675         proc = NULL;
 676         switch (event){
 677         case NETDEV_UP:
 678                 proc = lp->add_address;
 679                 break;
 680         case NETDEV_DOWN:
 681                 proc = lp->delete_address;
 682                 break;
 683         }
 684         if(proc != NULL){
 685                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 686                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 687                 (*proc)(addr_buf, netmask_buf, &lp->user);
 688         }
 689         return(NOTIFY_DONE);
 690 }
 691
 692 struct notifier_block uml_inetaddr_notifier = {
 693         .notifier_call          = uml_inetaddr_event,
 694 };
 695
 696 static int uml_net_init(void)
 697 {
 698         struct list_head *ele;
 699         struct uml_net_private *lp;
 700         struct in_device *ip;
 701         struct in_ifaddr *in;
 702
 703         mconsole_register_dev(&net_mc);
 704         register_inetaddr_notifier(&uml_inetaddr_notifier);
 705
 706         /* Devices may have been opened already, so the uml_inetaddr_notifier
 707          * didn't get a chance to run for them.  This fakes it so that
 708          * addresses which have already been set up get handled properly.
 709          */
 710         list_for_each(ele, &opened){
 711                 lp = list_entry(ele, struct uml_net_private, list);
 712                 ip = lp->dev->ip_ptr;
 713                 if(ip == NULL) continue;
 714                 in = ip->ifa_list;
 715                 while(in != NULL){
 716                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 717                         in = in->ifa_next;
 718                 }
 719         }
 720
 721         return(0);
 722 }
 723
 724 __initcall(uml_net_init);
 725
 726 static void close_devices(void)
 727 {
 728         struct list_head *ele;
 729         struct uml_net_private *lp;
 730
 731         list_for_each(ele, &opened){
 732                 lp = list_entry(ele, struct uml_net_private, list);
 733                 if((lp->close != NULL) && (lp->fd >= 0))
 734                         (*lp->close)(lp->fd, &lp->user);
 735                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 736         }
 737 }
 738
 739 __uml_exitcall(close_devices);
 740
 741 int setup_etheraddr(char *str, unsigned char *addr)
 742 {
 743         char *end;
 744         int i;
 745
 746         if(str == NULL)
 747                 return(0);
 748         for(i=0;i<6;i++){
 749                 addr[i] = simple_strtoul(str, &end, 16);
 750                 if((end == str) ||
 751                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 752                         printk(KERN_ERR
 753                                "setup_etheraddr: failed to parse '%s' "
 754                                "as an ethernet address\n", str);
 755                         return(0);
 756                 }
 757                 str = end + 1;
 758         }
 759         if(addr[0] & 1){
 760                 printk(KERN_ERR
 761                        "Attempt to assign a broadcast ethernet address to a "
 762                        "device disallowed\n");
 763                 return(0);
 764         }
 765         return(1);
 766 }
 767
 768 void dev_ip_addr(void *d, unsigned char *bin_buf)
 769 {
 770         struct net_device *dev = d;
 771         struct in_device *ip = dev->ip_ptr;
 772         struct in_ifaddr *in;
 773
 774         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 775                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 776                        "IP address\n");
 777                 return;
 778         }
 779         memcpy(bin_buf, &in->ifa_address, sizeof(in->ifa_address));
 780 }
 781
 782 void set_ether_mac(void *d, unsigned char *addr)
 783 {
 784         struct net_device *dev = d;
 785
 786         memcpy(dev->dev_addr, addr, ETH_ALEN);
 787 }
 788
 789 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 790 {
 791         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 792                 struct sk_buff *skb2;
 793
 794                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 795                 dev_kfree_skb(skb);
 796                 skb = skb2;
 797         }
 798         if(skb != NULL) skb_put(skb, extra);
 799         return(skb);
 800 }
 801
 802 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 803                                         void *),
 804                     void *arg)
 805 {
 806         struct net_device *dev = d;
 807         struct in_device *ip = dev->ip_ptr;
 808         struct in_ifaddr *in;
 809         unsigned char address[4], netmask[4];
 810
 811         if(ip == NULL) return;
 812         in = ip->ifa_list;
 813         while(in != NULL){
 814                 memcpy(address, &in->ifa_address, sizeof(address));
 815                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 816                 (*cb)(address, netmask, arg);
 817                 in = in->ifa_next;
 818         }
 819 }
 820
 821 int dev_netmask(void *d, void *m)
 822 {
 823         struct net_device *dev = d;
 824         struct in_device *ip = dev->ip_ptr;
 825         struct in_ifaddr *in;
 826         __u32 *mask_out = m;
 827
 828         if(ip == NULL)
 829                 return(1);
 830
 831         in = ip->ifa_list;
 832         if(in == NULL)
 833                 return(1);
 834
 835         *mask_out = in->ifa_mask;
 836         return(0);
 837 }
 838
 839 void *get_output_buffer(int *len_out)
 840 {
 841         void *ret;
 842
 843         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 844         if(ret) *len_out = PAGE_SIZE;
 845         else *len_out = 0;
 846         return(ret);
 847 }
 848
 849 void free_output_buffer(void *buffer)
 850 {
 851         free_pages((unsigned long) buffer, 0);
 852 }
 853
 854 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 855                      char **gate_addr)
 856 {
 857         char *remain;
 858
 859         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 860         if(remain != NULL){
 861                 printk("tap_setup_common - Extra garbage on specification : "
 862                        "'%s'\n", remain);
 863                 return(1);
 864         }
 865
 866         return(0);
 867 }
 868
 869 unsigned short eth_protocol(struct sk_buff *skb)
 870 {
 871         return(eth_type_trans(skb, skb->dev));
 872 }
 873
 874 /*
 875  * Overrides for Emacs so that we follow Linus's tabbing style.
 876  * Emacs will notice this stuff at the end of the file and automatically
 877  * adjust the settings for this buffer only.  This must remain at the end
 878  * of the file.
 879  * ---------------------------------------------------------------------------
 880  * Local variables:
 881  * c-file-style: "linux"
 882  * End:
 883  */