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