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 static 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 static void uml_dev_close(void* dev)
  72 {
  73         dev_close( (struct net_device *) dev);
  74 }
  75
  76 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  77 {
  78         struct net_device *dev = dev_id;
  79         struct uml_net_private *lp = dev->priv;
  80         int err;
  81
  82         if(!netif_running(dev))
  83                 return(IRQ_NONE);
  84
  85         spin_lock(&lp->lock);
  86         while((err = uml_net_rx(dev)) > 0) ;
  87         if(err < 0) {
  88                 DECLARE_WORK(close_work, uml_dev_close, dev);
  89                 printk(KERN_ERR
  90                        "Device '%s' read returned %d, shutting it down\n",
  91                        dev->name, err);
  92                 /* dev_close can't be called in interrupt context, and takes
  93                  * again lp->lock.
  94                  * And dev_close() can be safely called multiple times on the
  95                  * same device, since it tests for (dev->flags & IFF_UP). So
  96                  * there's no harm in delaying the device shutdown. */
  97                 schedule_work(&close_work);
  98                 goto out;
  99         }
 100         reactivate_fd(lp->fd, UM_ETH_IRQ);
 101
 102 out:
 103         spin_unlock(&lp->lock);
 104         return(IRQ_HANDLED);
 105 }
 106
 107 static int uml_net_open(struct net_device *dev)
 108 {
 109         struct uml_net_private *lp = dev->priv;
 110         int err;
 111
 112         spin_lock(&lp->lock);
 113
 114         if(lp->fd >= 0){
 115                 err = -ENXIO;
 116                 goto out;
 117         }
 118
 119         if(!lp->have_mac){
 120                 dev_ip_addr(dev, &lp->mac[2]);
 121                 set_ether_mac(dev, lp->mac);
 122         }
 123
 124         lp->fd = (*lp->open)(&lp->user);
 125         if(lp->fd < 0){
 126                 err = lp->fd;
 127                 goto out;
 128         }
 129
 130         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 131                              SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
 132         if(err != 0){
 133                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 134                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 135                 lp->fd = -1;
 136                 err = -ENETUNREACH;
 137         }
 138
 139         lp->tl.data = (unsigned long) &lp->user;
 140         netif_start_queue(dev);
 141
 142         /* clear buffer - it can happen that the host side of the interface
 143          * is full when we get here.  In this case, new data is never queued,
 144          * SIGIOs never arrive, and the net never works.
 145          */
 146         while((err = uml_net_rx(dev)) > 0) ;
 147
 148  out:
 149         spin_unlock(&lp->lock);
 150         return(err);
 151 }
 152
 153 static int uml_net_close(struct net_device *dev)
 154 {
 155         struct uml_net_private *lp = dev->priv;
 156
 157         netif_stop_queue(dev);
 158         spin_lock(&lp->lock);
 159
 160         free_irq(dev->irq, dev);
 161         if(lp->close != NULL)
 162                 (*lp->close)(lp->fd, &lp->user);
 163         lp->fd = -1;
 164         list_del(&lp->list);
 165
 166         spin_unlock(&lp->lock);
 167         return 0;
 168 }
 169
 170 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 171 {
 172         struct uml_net_private *lp = dev->priv;
 173         unsigned long flags;
 174         int len;
 175
 176         netif_stop_queue(dev);
 177
 178         spin_lock_irqsave(&lp->lock, flags);
 179
 180         len = (*lp->write)(lp->fd, &skb, lp);
 181
 182         if(len == skb->len) {
 183                 lp->stats.tx_packets++;
 184                 lp->stats.tx_bytes += skb->len;
 185                 dev->trans_start = jiffies;
 186                 netif_start_queue(dev);
 187
 188                 /* this is normally done in the interrupt when tx finishes */
 189                 netif_wake_queue(dev);
 190         }
 191         else if(len == 0){
 192                 netif_start_queue(dev);
 193                 lp->stats.tx_dropped++;
 194         }
 195         else {
 196                 netif_start_queue(dev);
 197                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 198         }
 199
 200         spin_unlock_irqrestore(&lp->lock, flags);
 201
 202         dev_kfree_skb(skb);
 203
 204         return 0;
 205 }
 206
 207 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 208 {
 209         struct uml_net_private *lp = dev->priv;
 210         return &lp->stats;
 211 }
 212
 213 static void uml_net_set_multicast_list(struct net_device *dev)
 214 {
 215         if (dev->flags & IFF_PROMISC) return;
 216         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 217         else dev->flags &= ~IFF_ALLMULTI;
 218 }
 219
 220 static void uml_net_tx_timeout(struct net_device *dev)
 221 {
 222         dev->trans_start = jiffies;
 223         netif_wake_queue(dev);
 224 }
 225
 226 static int uml_net_set_mac(struct net_device *dev, void *addr)
 227 {
 228         struct uml_net_private *lp = dev->priv;
 229         struct sockaddr *hwaddr = addr;
 230
 231         spin_lock(&lp->lock);
 232         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
 233         spin_unlock(&lp->lock);
 234
 235         return(0);
 236 }
 237
 238 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 239 {
 240         struct uml_net_private *lp = dev->priv;
 241         int err = 0;
 242
 243         spin_lock(&lp->lock);
 244
 245         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 246         if(new_mtu < 0){
 247                 err = new_mtu;
 248                 goto out;
 249         }
 250
 251         dev->mtu = new_mtu;
 252
 253  out:
 254         spin_unlock(&lp->lock);
 255         return err;
 256 }
 257
 258 static void uml_net_get_drvinfo(struct net_device *dev,
 259                                 struct ethtool_drvinfo *info)
 260 {
 261         strcpy(info->driver, DRIVER_NAME);
 262         strcpy(info->version, "42");
 263 }
 264
 265 static struct ethtool_ops uml_net_ethtool_ops = {
 266         .get_drvinfo    = uml_net_get_drvinfo,
 267         .get_link       = ethtool_op_get_link,
 268 };
 269
 270 void uml_net_user_timer_expire(unsigned long _conn)
 271 {
 272 #ifdef undef
 273         struct connection *conn = (struct connection *)_conn;
 274
 275         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 276         do_connect(conn);
 277 #endif
 278 }
 279
 280 static DEFINE_SPINLOCK(devices_lock);
 281 static LIST_HEAD(devices);
 282
 283 static struct platform_driver uml_net_driver = {
 284         .driver = {
 285                 .name  = DRIVER_NAME,
 286         },
 287 };
 288 static int driver_registered;
 289
 290 static int eth_configure(int n, void *init, char *mac,
 291                          struct transport *transport)
 292 {
 293         struct uml_net *device;
 294         struct net_device *dev;
 295         struct uml_net_private *lp;
 296         int save, err, size;
 297
 298         size = transport->private_size + sizeof(struct uml_net_private) +
 299                 sizeof(((struct uml_net_private *) 0)->user);
 300
 301         device = kmalloc(sizeof(*device), GFP_KERNEL);
 302         if (device == NULL) {
 303                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 304                 return(1);
 305         }
 306
 307         memset(device, 0, sizeof(*device));
 308         INIT_LIST_HEAD(&device->list);
 309         device->index = n;
 310
 311         spin_lock(&devices_lock);
 312         list_add(&device->list, &devices);
 313         spin_unlock(&devices_lock);
 314
 315         if (setup_etheraddr(mac, device->mac))
 316                 device->have_mac = 1;
 317
 318         printk(KERN_INFO "Netdevice %d ", n);
 319         if (device->have_mac)
 320                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 321                        device->mac[0], device->mac[1],
 322                        device->mac[2], device->mac[3],
 323                        device->mac[4], device->mac[5]);
 324         printk(": ");
 325         dev = alloc_etherdev(size);
 326         if (dev == NULL) {
 327                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 328                 return 1;
 329         }
 330
 331         lp = dev->priv;
 332         /* This points to the transport private data. It's still clear, but we
 333          * must memset it to 0 *now*. Let's help the drivers. */
 334         memset(lp, 0, size);
 335
 336         /* sysfs register */
 337         if (!driver_registered) {
 338                 platform_driver_register(&uml_net_driver);
 339                 driver_registered = 1;
 340         }
 341         device->pdev.id = n;
 342         device->pdev.name = DRIVER_NAME;
 343         platform_device_register(&device->pdev);
 344         SET_NETDEV_DEV(dev,&device->pdev.dev);
 345
 346         /* If this name ends up conflicting with an existing registered
 347          * netdevice, that is OK, register_netdev{,ice}() will notice this
 348          * and fail.
 349          */
 350         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 351         device->dev = dev;
 352
 353         (*transport->kern->init)(dev, init);
 354
 355         dev->mtu = transport->user->max_packet;
 356         dev->open = uml_net_open;
 357         dev->hard_start_xmit = uml_net_start_xmit;
 358         dev->stop = uml_net_close;
 359         dev->get_stats = uml_net_get_stats;
 360         dev->set_multicast_list = uml_net_set_multicast_list;
 361         dev->tx_timeout = uml_net_tx_timeout;
 362         dev->set_mac_address = uml_net_set_mac;
 363         dev->change_mtu = uml_net_change_mtu;
 364         dev->ethtool_ops = &uml_net_ethtool_ops;
 365         dev->watchdog_timeo = (HZ >> 1);
 366         dev->irq = UM_ETH_IRQ;
 367
 368         rtnl_lock();
 369         err = register_netdevice(dev);
 370         rtnl_unlock();
 371         if (err) {
 372                 device->dev = NULL;
 373                 /* XXX: should we call ->remove() here? */
 374                 free_netdev(dev);
 375                 return 1;
 376         }
 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 = kstrdup(str, GFP_KERNEL);
 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_id(char **str, int *start_out, int *end_out)
 617 {
 618         char *end;
 619         int n;
 620
 621         n = simple_strtoul(*str, &end, 0);
 622         if((*end != '\0') || (end == *str))
 623                 return -1;
 624
 625         *start_out = n;
 626         *end_out = n;
 627         *str = end;
 628         return n;
 629 }
 630
 631 static int net_remove(int n)
 632 {
 633         struct uml_net *device;
 634         struct net_device *dev;
 635         struct uml_net_private *lp;
 636
 637         device = find_device(n);
 638         if(device == NULL)
 639                 return -ENODEV;
 640
 641         dev = device->dev;
 642         lp = dev->priv;
 643         if(lp->fd > 0)
 644                 return -EBUSY;
 645         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 646         unregister_netdev(dev);
 647         platform_device_unregister(&device->pdev);
 648
 649         list_del(&device->list);
 650         kfree(device);
 651         free_netdev(dev);
 652         return 0;
 653 }
 654
 655 static struct mc_device net_mc = {
 656         .name           = "eth",
 657         .config         = net_config,
 658         .get_config     = NULL,
 659         .id             = net_id,
 660         .remove         = net_remove,
 661 };
 662
 663 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 664                               void *ptr)
 665 {
 666         struct in_ifaddr *ifa = ptr;
 667         struct net_device *dev = ifa->ifa_dev->dev;
 668         struct uml_net_private *lp;
 669         void (*proc)(unsigned char *, unsigned char *, void *);
 670         unsigned char addr_buf[4], netmask_buf[4];
 671
 672         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 673
 674         lp = dev->priv;
 675
 676         proc = NULL;
 677         switch (event){
 678         case NETDEV_UP:
 679                 proc = lp->add_address;
 680                 break;
 681         case NETDEV_DOWN:
 682                 proc = lp->delete_address;
 683                 break;
 684         }
 685         if(proc != NULL){
 686                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 687                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 688                 (*proc)(addr_buf, netmask_buf, &lp->user);
 689         }
 690         return(NOTIFY_DONE);
 691 }
 692
 693 struct notifier_block uml_inetaddr_notifier = {
 694         .notifier_call          = uml_inetaddr_event,
 695 };
 696
 697 static int uml_net_init(void)
 698 {
 699         struct list_head *ele;
 700         struct uml_net_private *lp;
 701         struct in_device *ip;
 702         struct in_ifaddr *in;
 703
 704         mconsole_register_dev(&net_mc);
 705         register_inetaddr_notifier(&uml_inetaddr_notifier);
 706
 707         /* Devices may have been opened already, so the uml_inetaddr_notifier
 708          * didn't get a chance to run for them.  This fakes it so that
 709          * addresses which have already been set up get handled properly.
 710          */
 711         list_for_each(ele, &opened){
 712                 lp = list_entry(ele, struct uml_net_private, list);
 713                 ip = lp->dev->ip_ptr;
 714                 if(ip == NULL) continue;
 715                 in = ip->ifa_list;
 716                 while(in != NULL){
 717                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 718                         in = in->ifa_next;
 719                 }
 720         }
 721
 722         return(0);
 723 }
 724
 725 __initcall(uml_net_init);
 726
 727 static void close_devices(void)
 728 {
 729         struct list_head *ele;
 730         struct uml_net_private *lp;
 731
 732         list_for_each(ele, &opened){
 733                 lp = list_entry(ele, struct uml_net_private, list);
 734                 free_irq(lp->dev->irq, lp->dev);
 735                 if((lp->close != NULL) && (lp->fd >= 0))
 736                         (*lp->close)(lp->fd, &lp->user);
 737                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 738         }
 739 }
 740
 741 __uml_exitcall(close_devices);
 742
 743 int setup_etheraddr(char *str, unsigned char *addr)
 744 {
 745         char *end;
 746         int i;
 747
 748         if(str == NULL)
 749                 return(0);
 750         for(i=0;i<6;i++){
 751                 addr[i] = simple_strtoul(str, &end, 16);
 752                 if((end == str) ||
 753                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 754                         printk(KERN_ERR
 755                                "setup_etheraddr: failed to parse '%s' "
 756                                "as an ethernet address\n", str);
 757                         return(0);
 758                 }
 759                 str = end + 1;
 760         }
 761         if(addr[0] & 1){
 762                 printk(KERN_ERR
 763                        "Attempt to assign a broadcast ethernet address to a "
 764                        "device disallowed\n");
 765                 return(0);
 766         }
 767         return(1);
 768 }
 769
 770 void dev_ip_addr(void *d, unsigned char *bin_buf)
 771 {
 772         struct net_device *dev = d;
 773         struct in_device *ip = dev->ip_ptr;
 774         struct in_ifaddr *in;
 775
 776         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 777                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 778                        "IP address\n");
 779                 return;
 780         }
 781         memcpy(bin_buf, &in->ifa_address, sizeof(in->ifa_address));
 782 }
 783
 784 void set_ether_mac(void *d, unsigned char *addr)
 785 {
 786         struct net_device *dev = d;
 787
 788         memcpy(dev->dev_addr, addr, ETH_ALEN);
 789 }
 790
 791 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 792 {
 793         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 794                 struct sk_buff *skb2;
 795
 796                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 797                 dev_kfree_skb(skb);
 798                 skb = skb2;
 799         }
 800         if(skb != NULL) skb_put(skb, extra);
 801         return(skb);
 802 }
 803
 804 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 805                                         void *),
 806                     void *arg)
 807 {
 808         struct net_device *dev = d;
 809         struct in_device *ip = dev->ip_ptr;
 810         struct in_ifaddr *in;
 811         unsigned char address[4], netmask[4];
 812
 813         if(ip == NULL) return;
 814         in = ip->ifa_list;
 815         while(in != NULL){
 816                 memcpy(address, &in->ifa_address, sizeof(address));
 817                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 818                 (*cb)(address, netmask, arg);
 819                 in = in->ifa_next;
 820         }
 821 }
 822
 823 int dev_netmask(void *d, void *m)
 824 {
 825         struct net_device *dev = d;
 826         struct in_device *ip = dev->ip_ptr;
 827         struct in_ifaddr *in;
 828         __u32 *mask_out = m;
 829
 830         if(ip == NULL)
 831                 return(1);
 832
 833         in = ip->ifa_list;
 834         if(in == NULL)
 835                 return(1);
 836
 837         *mask_out = in->ifa_mask;
 838         return(0);
 839 }
 840
 841 void *get_output_buffer(int *len_out)
 842 {
 843         void *ret;
 844
 845         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 846         if(ret) *len_out = PAGE_SIZE;
 847         else *len_out = 0;
 848         return(ret);
 849 }
 850
 851 void free_output_buffer(void *buffer)
 852 {
 853         free_pages((unsigned long) buffer, 0);
 854 }
 855
 856 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 857                      char **gate_addr)
 858 {
 859         char *remain;
 860
 861         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 862         if(remain != NULL){
 863                 printk("tap_setup_common - Extra garbage on specification : "
 864                        "'%s'\n", remain);
 865                 return(1);
 866         }
 867
 868         return(0);
 869 }
 870
 871 unsigned short eth_protocol(struct sk_buff *skb)
 872 {
 873         return(eth_type_trans(skb, skb->dev));
 874 }
 875
 876 /*
 877  * Overrides for Emacs so that we follow Linus's tabbing style.
 878  * Emacs will notice this stuff at the end of the file and automatically
 879  * adjust the settings for this buffer only.  This must remain at the end
 880  * of the file.
 881  * ---------------------------------------------------------------------------
 882  * Local variables:
 883  * c-file-style: "linux"
 884  * End:
 885  */