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