git.oblomov.eu Git - linux-2.6/blob - arch/um/drivers/net_kern.c

   1 /*
   2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   3  * James Leu (jleu@mindspring.net).
   4  * Copyright (C) 2001 by various other people who didn't put their name here.
   5  * Licensed under the GPL.
   6  */
   7
   8 #include "linux/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 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
  34 {
  35         memcpy(dev->dev_addr, addr, ETH_ALEN);
  36 }
  37
  38 #define DRIVER_NAME "uml-netdev"
  39
  40 static DEFINE_SPINLOCK(opened_lock);
  41 static LIST_HEAD(opened);
  42
  43 static int uml_net_rx(struct net_device *dev)
  44 {
  45         struct uml_net_private *lp = dev->priv;
  46         int pkt_len;
  47         struct sk_buff *skb;
  48
  49         /* If we can't allocate memory, try again next round. */
  50         skb = dev_alloc_skb(dev->mtu);
  51         if (skb == NULL) {
  52                 lp->stats.rx_dropped++;
  53                 return 0;
  54         }
  55
  56         skb->dev = dev;
  57         skb_put(skb, dev->mtu);
  58         skb->mac.raw = skb->data;
  59         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  60
  61         if (pkt_len > 0) {
  62                 skb_trim(skb, pkt_len);
  63                 skb->protocol = (*lp->protocol)(skb);
  64                 netif_rx(skb);
  65
  66                 lp->stats.rx_bytes += skb->len;
  67                 lp->stats.rx_packets++;
  68                 return pkt_len;
  69         }
  70
  71         kfree_skb(skb);
  72         return pkt_len;
  73 }
  74
  75 static void uml_dev_close(struct work_struct *work)
  76 {
  77         struct uml_net_private *lp =
  78                 container_of(work, struct uml_net_private, work);
  79         dev_close(lp->dev);
  80 }
  81
  82 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
  83 {
  84         struct net_device *dev = dev_id;
  85         struct uml_net_private *lp = dev->priv;
  86         int err;
  87
  88         if(!netif_running(dev))
  89                 return(IRQ_NONE);
  90
  91         spin_lock(&lp->lock);
  92         while((err = uml_net_rx(dev)) > 0) ;
  93         if(err < 0) {
  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                  * Furthermore, the workqueue will not re-enqueue an already
 103                  * enqueued work item. */
 104                 schedule_work(&lp->work);
 105                 goto out;
 106         }
 107         reactivate_fd(lp->fd, UM_ETH_IRQ);
 108
 109 out:
 110         spin_unlock(&lp->lock);
 111         return(IRQ_HANDLED);
 112 }
 113
 114 static int uml_net_open(struct net_device *dev)
 115 {
 116         struct uml_net_private *lp = dev->priv;
 117         int err;
 118
 119         if(lp->fd >= 0){
 120                 err = -ENXIO;
 121                 goto out;
 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                              IRQF_DISABLED | IRQF_SHARED, 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_lock(&opened_lock);
 148         list_add(&lp->list, &opened);
 149         spin_unlock(&opened_lock);
 150
 151         return 0;
 152 out_close:
 153         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 154         lp->fd = -1;
 155 out:
 156         return err;
 157 }
 158
 159 static int uml_net_close(struct net_device *dev)
 160 {
 161         struct uml_net_private *lp = dev->priv;
 162
 163         netif_stop_queue(dev);
 164
 165         free_irq(dev->irq, dev);
 166         if(lp->close != NULL)
 167                 (*lp->close)(lp->fd, &lp->user);
 168         lp->fd = -1;
 169
 170         spin_lock(&opened_lock);
 171         list_del(&lp->list);
 172         spin_unlock(&opened_lock);
 173
 174         return 0;
 175 }
 176
 177 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 178 {
 179         struct uml_net_private *lp = dev->priv;
 180         unsigned long flags;
 181         int len;
 182
 183         netif_stop_queue(dev);
 184
 185         spin_lock_irqsave(&lp->lock, flags);
 186
 187         len = (*lp->write)(lp->fd, &skb, lp);
 188
 189         if(len == skb->len) {
 190                 lp->stats.tx_packets++;
 191                 lp->stats.tx_bytes += skb->len;
 192                 dev->trans_start = jiffies;
 193                 netif_start_queue(dev);
 194
 195                 /* this is normally done in the interrupt when tx finishes */
 196                 netif_wake_queue(dev);
 197         }
 198         else if(len == 0){
 199                 netif_start_queue(dev);
 200                 lp->stats.tx_dropped++;
 201         }
 202         else {
 203                 netif_start_queue(dev);
 204                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 205         }
 206
 207         spin_unlock_irqrestore(&lp->lock, flags);
 208
 209         dev_kfree_skb(skb);
 210
 211         return 0;
 212 }
 213
 214 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 215 {
 216         struct uml_net_private *lp = dev->priv;
 217         return &lp->stats;
 218 }
 219
 220 static void uml_net_set_multicast_list(struct net_device *dev)
 221 {
 222         if (dev->flags & IFF_PROMISC) return;
 223         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 224         else dev->flags &= ~IFF_ALLMULTI;
 225 }
 226
 227 static void uml_net_tx_timeout(struct net_device *dev)
 228 {
 229         dev->trans_start = jiffies;
 230         netif_wake_queue(dev);
 231 }
 232
 233 static int uml_net_set_mac(struct net_device *dev, void *addr)
 234 {
 235         struct uml_net_private *lp = dev->priv;
 236         struct sockaddr *hwaddr = addr;
 237
 238         spin_lock_irq(&lp->lock);
 239         set_ether_mac(dev, hwaddr->sa_data);
 240         spin_unlock_irq(&lp->lock);
 241
 242         return(0);
 243 }
 244
 245 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 246 {
 247         struct uml_net_private *lp = dev->priv;
 248         int err = 0;
 249
 250         spin_lock_irq(&lp->lock);
 251
 252         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 253         if(new_mtu < 0){
 254                 err = new_mtu;
 255                 goto out;
 256         }
 257
 258         dev->mtu = new_mtu;
 259
 260  out:
 261         spin_unlock_irq(&lp->lock);
 262         return err;
 263 }
 264
 265 static void uml_net_get_drvinfo(struct net_device *dev,
 266                                 struct ethtool_drvinfo *info)
 267 {
 268         strcpy(info->driver, DRIVER_NAME);
 269         strcpy(info->version, "42");
 270 }
 271
 272 static struct ethtool_ops uml_net_ethtool_ops = {
 273         .get_drvinfo    = uml_net_get_drvinfo,
 274         .get_link       = ethtool_op_get_link,
 275 };
 276
 277 void uml_net_user_timer_expire(unsigned long _conn)
 278 {
 279 #ifdef undef
 280         struct connection *conn = (struct connection *)_conn;
 281
 282         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 283         do_connect(conn);
 284 #endif
 285 }
 286
 287 static void setup_etheraddr(char *str, unsigned char *addr)
 288 {
 289         char *end;
 290         int i;
 291
 292         if(str == NULL)
 293                 goto random;
 294
 295         for(i=0;i<6;i++){
 296                 addr[i] = simple_strtoul(str, &end, 16);
 297                 if((end == str) ||
 298                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 299                         printk(KERN_ERR
 300                                "setup_etheraddr: failed to parse '%s' "
 301                                "as an ethernet address\n", str);
 302                         goto random;
 303                 }
 304                 str = end + 1;
 305         }
 306         if(addr[0] & 1){
 307                 printk(KERN_ERR
 308                        "Attempt to assign a broadcast ethernet address to a "
 309                        "device disallowed\n");
 310                 goto random;
 311         }
 312         return;
 313
 314 random:
 315         random_ether_addr(addr);
 316 }
 317
 318 static DEFINE_SPINLOCK(devices_lock);
 319 static LIST_HEAD(devices);
 320
 321 static struct platform_driver uml_net_driver = {
 322         .driver = {
 323                 .name  = DRIVER_NAME,
 324         },
 325 };
 326 static int driver_registered;
 327
 328 static int eth_configure(int n, void *init, char *mac,
 329                          struct transport *transport)
 330 {
 331         struct uml_net *device;
 332         struct net_device *dev;
 333         struct uml_net_private *lp;
 334         int save, err, size;
 335
 336         size = transport->private_size + sizeof(struct uml_net_private) +
 337                 sizeof(((struct uml_net_private *) 0)->user);
 338
 339         device = kzalloc(sizeof(*device), GFP_KERNEL);
 340         if (device == NULL) {
 341                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 342                 return(1);
 343         }
 344
 345         INIT_LIST_HEAD(&device->list);
 346         device->index = n;
 347
 348         spin_lock(&devices_lock);
 349         list_add(&device->list, &devices);
 350         spin_unlock(&devices_lock);
 351
 352         setup_etheraddr(mac, device->mac);
 353
 354         printk(KERN_INFO "Netdevice %d ", n);
 355         printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 356                device->mac[0], device->mac[1],
 357                device->mac[2], device->mac[3],
 358                device->mac[4], device->mac[5]);
 359         printk(": ");
 360         dev = alloc_etherdev(size);
 361         if (dev == NULL) {
 362                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 363                 return 1;
 364         }
 365
 366         lp = dev->priv;
 367         /* This points to the transport private data. It's still clear, but we
 368          * must memset it to 0 *now*. Let's help the drivers. */
 369         memset(lp, 0, size);
 370         INIT_WORK(&lp->work, uml_dev_close);
 371
 372         /* sysfs register */
 373         if (!driver_registered) {
 374                 platform_driver_register(&uml_net_driver);
 375                 driver_registered = 1;
 376         }
 377         device->pdev.id = n;
 378         device->pdev.name = DRIVER_NAME;
 379         platform_device_register(&device->pdev);
 380         SET_NETDEV_DEV(dev,&device->pdev.dev);
 381
 382         /* If this name ends up conflicting with an existing registered
 383          * netdevice, that is OK, register_netdev{,ice}() will notice this
 384          * and fail.
 385          */
 386         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 387         device->dev = dev;
 388
 389         (*transport->kern->init)(dev, init);
 390
 391         dev->mtu = transport->user->max_packet;
 392         dev->open = uml_net_open;
 393         dev->hard_start_xmit = uml_net_start_xmit;
 394         dev->stop = uml_net_close;
 395         dev->get_stats = uml_net_get_stats;
 396         dev->set_multicast_list = uml_net_set_multicast_list;
 397         dev->tx_timeout = uml_net_tx_timeout;
 398         dev->set_mac_address = uml_net_set_mac;
 399         dev->change_mtu = uml_net_change_mtu;
 400         dev->ethtool_ops = &uml_net_ethtool_ops;
 401         dev->watchdog_timeo = (HZ >> 1);
 402         dev->irq = UM_ETH_IRQ;
 403
 404         rtnl_lock();
 405         err = register_netdevice(dev);
 406         rtnl_unlock();
 407         if (err) {
 408                 device->dev = NULL;
 409                 /* XXX: should we call ->remove() here? */
 410                 free_netdev(dev);
 411                 return 1;
 412         }
 413
 414         /* lp.user is the first four bytes of the transport data, which
 415          * has already been initialized.  This structure assignment will
 416          * overwrite that, so we make sure that .user gets overwritten with
 417          * what it already has.
 418          */
 419         save = lp->user[0];
 420         *lp = ((struct uml_net_private)
 421                 { .list                 = LIST_HEAD_INIT(lp->list),
 422                   .dev                  = dev,
 423                   .fd                   = -1,
 424                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 425                   .protocol             = transport->kern->protocol,
 426                   .open                 = transport->user->open,
 427                   .close                = transport->user->close,
 428                   .remove               = transport->user->remove,
 429                   .read                 = transport->kern->read,
 430                   .write                = transport->kern->write,
 431                   .add_address          = transport->user->add_address,
 432                   .delete_address       = transport->user->delete_address,
 433                   .set_mtu              = transport->user->set_mtu,
 434                   .user                 = { save } });
 435
 436         init_timer(&lp->tl);
 437         spin_lock_init(&lp->lock);
 438         lp->tl.function = uml_net_user_timer_expire;
 439         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 440
 441         if (transport->user->init)
 442                 (*transport->user->init)(&lp->user, dev);
 443
 444         set_ether_mac(dev, device->mac);
 445
 446         return 0;
 447 }
 448
 449 static struct uml_net *find_device(int n)
 450 {
 451         struct uml_net *device;
 452         struct list_head *ele;
 453
 454         spin_lock(&devices_lock);
 455         list_for_each(ele, &devices){
 456                 device = list_entry(ele, struct uml_net, list);
 457                 if(device->index == n)
 458                         goto out;
 459         }
 460         device = NULL;
 461  out:
 462         spin_unlock(&devices_lock);
 463         return(device);
 464 }
 465
 466 static int eth_parse(char *str, int *index_out, char **str_out,
 467                      char **error_out)
 468 {
 469         char *end;
 470         int n, err = -EINVAL;;
 471
 472         n = simple_strtoul(str, &end, 0);
 473         if(end == str){
 474                 *error_out = "Bad device number";
 475                 return err;
 476         }
 477
 478         str = end;
 479         if(*str != '='){
 480                 *error_out = "Expected '=' after device number";
 481                 return err;
 482         }
 483
 484         str++;
 485         if(find_device(n)){
 486                 *error_out = "Device already configured";
 487                 return err;
 488         }
 489
 490         *index_out = n;
 491         *str_out = str;
 492         return 0;
 493 }
 494
 495 struct eth_init {
 496         struct list_head list;
 497         char *init;
 498         int index;
 499 };
 500
 501 static DEFINE_SPINLOCK(transports_lock);
 502 static LIST_HEAD(transports);
 503
 504 /* Filled in during early boot */
 505 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 506
 507 static int check_transport(struct transport *transport, char *eth, int n,
 508                            void **init_out, char **mac_out)
 509 {
 510         int len;
 511
 512         len = strlen(transport->name);
 513         if(strncmp(eth, transport->name, len))
 514                 return(0);
 515
 516         eth += len;
 517         if(*eth == ',')
 518                 eth++;
 519         else if(*eth != '\0')
 520                 return(0);
 521
 522         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 523         if(*init_out == NULL)
 524                 return(1);
 525
 526         if(!transport->setup(eth, mac_out, *init_out)){
 527                 kfree(*init_out);
 528                 *init_out = NULL;
 529         }
 530         return(1);
 531 }
 532
 533 void register_transport(struct transport *new)
 534 {
 535         struct list_head *ele, *next;
 536         struct eth_init *eth;
 537         void *init;
 538         char *mac = NULL;
 539         int match;
 540
 541         spin_lock(&transports_lock);
 542         BUG_ON(!list_empty(&new->list));
 543         list_add(&new->list, &transports);
 544         spin_unlock(&transports_lock);
 545
 546         list_for_each_safe(ele, next, &eth_cmd_line){
 547                 eth = list_entry(ele, struct eth_init, list);
 548                 match = check_transport(new, eth->init, eth->index, &init,
 549                                         &mac);
 550                 if(!match)
 551                         continue;
 552                 else if(init != NULL){
 553                         eth_configure(eth->index, init, mac, new);
 554                         kfree(init);
 555                 }
 556                 list_del(&eth->list);
 557         }
 558 }
 559
 560 static int eth_setup_common(char *str, int index)
 561 {
 562         struct list_head *ele;
 563         struct transport *transport;
 564         void *init;
 565         char *mac = NULL;
 566
 567         list_for_each(ele, &transports){
 568                 transport = list_entry(ele, struct transport, list);
 569                 if(!check_transport(transport, str, index, &init, &mac))
 570                         continue;
 571                 if(init != NULL){
 572                         eth_configure(index, init, mac, transport);
 573                         kfree(init);
 574                 }
 575                 return(1);
 576         }
 577         return(0);
 578 }
 579
 580 static int eth_setup(char *str)
 581 {
 582         struct eth_init *new;
 583         char *error;
 584         int n, err;
 585
 586         err = eth_parse(str, &n, &str, &error);
 587         if(err){
 588                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 589                        str, error);
 590                 return 1;
 591         }
 592
 593         new = alloc_bootmem(sizeof(*new));
 594         if (new == NULL){
 595                 printk("eth_init : alloc_bootmem failed\n");
 596                 return 1;
 597         }
 598
 599         INIT_LIST_HEAD(&new->list);
 600         new->index = n;
 601         new->init = str;
 602
 603         list_add_tail(&new->list, &eth_cmd_line);
 604         return 1;
 605 }
 606
 607 __setup("eth", eth_setup);
 608 __uml_help(eth_setup,
 609 "eth[0-9]+=<transport>,<options>\n"
 610 "    Configure a network device.\n\n"
 611 );
 612
 613 #if 0
 614 static int eth_init(void)
 615 {
 616         struct list_head *ele, *next;
 617         struct eth_init *eth;
 618
 619         list_for_each_safe(ele, next, &eth_cmd_line){
 620                 eth = list_entry(ele, struct eth_init, list);
 621
 622                 if(eth_setup_common(eth->init, eth->index))
 623                         list_del(&eth->list);
 624         }
 625
 626         return(1);
 627 }
 628 __initcall(eth_init);
 629 #endif
 630
 631 static int net_config(char *str, char **error_out)
 632 {
 633         int n, err;
 634
 635         err = eth_parse(str, &n, &str, error_out);
 636         if(err)
 637                 return err;
 638
 639         /* This string is broken up and the pieces used by the underlying
 640          * driver.  So, it is freed only if eth_setup_common fails.
 641          */
 642         str = kstrdup(str, GFP_KERNEL);
 643         if(str == NULL){
 644                 *error_out = "net_config failed to strdup string";
 645                 return -ENOMEM;
 646         }
 647         err = !eth_setup_common(str, n);
 648         if(err)
 649                 kfree(str);
 650         return(err);
 651 }
 652
 653 static int net_id(char **str, int *start_out, int *end_out)
 654 {
 655         char *end;
 656         int n;
 657
 658         n = simple_strtoul(*str, &end, 0);
 659         if((*end != '\0') || (end == *str))
 660                 return -1;
 661
 662         *start_out = n;
 663         *end_out = n;
 664         *str = end;
 665         return n;
 666 }
 667
 668 static int net_remove(int n, char **error_out)
 669 {
 670         struct uml_net *device;
 671         struct net_device *dev;
 672         struct uml_net_private *lp;
 673
 674         device = find_device(n);
 675         if(device == NULL)
 676                 return -ENODEV;
 677
 678         dev = device->dev;
 679         lp = dev->priv;
 680         if(lp->fd > 0)
 681                 return -EBUSY;
 682         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 683         unregister_netdev(dev);
 684         platform_device_unregister(&device->pdev);
 685
 686         list_del(&device->list);
 687         kfree(device);
 688         free_netdev(dev);
 689         return 0;
 690 }
 691
 692 static struct mc_device net_mc = {
 693         .name           = "eth",
 694         .config         = net_config,
 695         .get_config     = NULL,
 696         .id             = net_id,
 697         .remove         = net_remove,
 698 };
 699
 700 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 701                               void *ptr)
 702 {
 703         struct in_ifaddr *ifa = ptr;
 704         struct net_device *dev = ifa->ifa_dev->dev;
 705         struct uml_net_private *lp;
 706         void (*proc)(unsigned char *, unsigned char *, void *);
 707         unsigned char addr_buf[4], netmask_buf[4];
 708
 709         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 710
 711         lp = dev->priv;
 712
 713         proc = NULL;
 714         switch (event){
 715         case NETDEV_UP:
 716                 proc = lp->add_address;
 717                 break;
 718         case NETDEV_DOWN:
 719                 proc = lp->delete_address;
 720                 break;
 721         }
 722         if(proc != NULL){
 723                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 724                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 725                 (*proc)(addr_buf, netmask_buf, &lp->user);
 726         }
 727         return(NOTIFY_DONE);
 728 }
 729
 730 struct notifier_block uml_inetaddr_notifier = {
 731         .notifier_call          = uml_inetaddr_event,
 732 };
 733
 734 static int uml_net_init(void)
 735 {
 736         struct list_head *ele;
 737         struct uml_net_private *lp;
 738         struct in_device *ip;
 739         struct in_ifaddr *in;
 740
 741         mconsole_register_dev(&net_mc);
 742         register_inetaddr_notifier(&uml_inetaddr_notifier);
 743
 744         /* Devices may have been opened already, so the uml_inetaddr_notifier
 745          * didn't get a chance to run for them.  This fakes it so that
 746          * addresses which have already been set up get handled properly.
 747          */
 748         list_for_each(ele, &opened){
 749                 lp = list_entry(ele, struct uml_net_private, list);
 750                 ip = lp->dev->ip_ptr;
 751                 if(ip == NULL) continue;
 752                 in = ip->ifa_list;
 753                 while(in != NULL){
 754                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 755                         in = in->ifa_next;
 756                 }
 757         }
 758
 759         return(0);
 760 }
 761
 762 __initcall(uml_net_init);
 763
 764 static void close_devices(void)
 765 {
 766         struct list_head *ele;
 767         struct uml_net_private *lp;
 768
 769         list_for_each(ele, &opened){
 770                 lp = list_entry(ele, struct uml_net_private, list);
 771                 free_irq(lp->dev->irq, lp->dev);
 772                 if((lp->close != NULL) && (lp->fd >= 0))
 773                         (*lp->close)(lp->fd, &lp->user);
 774                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 775         }
 776 }
 777
 778 __uml_exitcall(close_devices);
 779
 780 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 781 {
 782         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 783                 struct sk_buff *skb2;
 784
 785                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 786                 dev_kfree_skb(skb);
 787                 skb = skb2;
 788         }
 789         if(skb != NULL) skb_put(skb, extra);
 790         return(skb);
 791 }
 792
 793 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 794                                         void *),
 795                     void *arg)
 796 {
 797         struct net_device *dev = d;
 798         struct in_device *ip = dev->ip_ptr;
 799         struct in_ifaddr *in;
 800         unsigned char address[4], netmask[4];
 801
 802         if(ip == NULL) return;
 803         in = ip->ifa_list;
 804         while(in != NULL){
 805                 memcpy(address, &in->ifa_address, sizeof(address));
 806                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 807                 (*cb)(address, netmask, arg);
 808                 in = in->ifa_next;
 809         }
 810 }
 811
 812 int dev_netmask(void *d, void *m)
 813 {
 814         struct net_device *dev = d;
 815         struct in_device *ip = dev->ip_ptr;
 816         struct in_ifaddr *in;
 817         __be32 *mask_out = m;
 818
 819         if(ip == NULL)
 820                 return(1);
 821
 822         in = ip->ifa_list;
 823         if(in == NULL)
 824                 return(1);
 825
 826         *mask_out = in->ifa_mask;
 827         return(0);
 828 }
 829
 830 void *get_output_buffer(int *len_out)
 831 {
 832         void *ret;
 833
 834         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 835         if(ret) *len_out = PAGE_SIZE;
 836         else *len_out = 0;
 837         return(ret);
 838 }
 839
 840 void free_output_buffer(void *buffer)
 841 {
 842         free_pages((unsigned long) buffer, 0);
 843 }
 844
 845 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 846                      char **gate_addr)
 847 {
 848         char *remain;
 849
 850         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 851         if(remain != NULL){
 852                 printk("tap_setup_common - Extra garbage on specification : "
 853                        "'%s'\n", remain);
 854                 return(1);
 855         }
 856
 857         return(0);
 858 }
 859
 860 unsigned short eth_protocol(struct sk_buff *skb)
 861 {
 862         return(eth_type_trans(skb, skb->dev));
 863 }