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