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_reset_mac_header(skb);
  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 void 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;
 343         }
 344
 345         INIT_LIST_HEAD(&device->list);
 346         device->index = n;
 347
 348         setup_etheraddr(mac, device->mac);
 349
 350         printk(KERN_INFO "Netdevice %d ", n);
 351         printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 352                device->mac[0], device->mac[1],
 353                device->mac[2], device->mac[3],
 354                device->mac[4], device->mac[5]);
 355         printk(": ");
 356         dev = alloc_etherdev(size);
 357         if (dev == NULL) {
 358                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 359                 goto out_free_device;
 360         }
 361
 362         lp = dev->priv;
 363         /* This points to the transport private data. It's still clear, but we
 364          * must memset it to 0 *now*. Let's help the drivers. */
 365         memset(lp, 0, size);
 366         INIT_WORK(&lp->work, uml_dev_close);
 367
 368         /* sysfs register */
 369         if (!driver_registered) {
 370                 platform_driver_register(&uml_net_driver);
 371                 driver_registered = 1;
 372         }
 373         device->pdev.id = n;
 374         device->pdev.name = DRIVER_NAME;
 375         if(platform_device_register(&device->pdev))
 376                 goto out_free_netdev;
 377         SET_NETDEV_DEV(dev,&device->pdev.dev);
 378
 379         /* If this name ends up conflicting with an existing registered
 380          * netdevice, that is OK, register_netdev{,ice}() will notice this
 381          * and fail.
 382          */
 383         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 384         device->dev = dev;
 385
 386         /*
 387          * These just fill in a data structure, so there's no failure
 388          * to be worried about.
 389          */
 390         (*transport->kern->init)(dev, init);
 391
 392         /* lp.user is the first four bytes of the transport data, which
 393          * has already been initialized.  This structure assignment will
 394          * overwrite that, so we make sure that .user gets overwritten with
 395          * what it already has.
 396          */
 397         save = lp->user[0];
 398         *lp = ((struct uml_net_private)
 399                 { .list                 = LIST_HEAD_INIT(lp->list),
 400                   .dev                  = dev,
 401                   .fd                   = -1,
 402                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 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         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 418
 419         if ((transport->user->init != NULL) &&
 420             ((*transport->user->init)(&lp->user, dev) != 0))
 421                 goto out_unregister;
 422
 423         set_ether_mac(dev, device->mac);
 424         dev->mtu = transport->user->max_packet;
 425         dev->open = uml_net_open;
 426         dev->hard_start_xmit = uml_net_start_xmit;
 427         dev->stop = uml_net_close;
 428         dev->get_stats = uml_net_get_stats;
 429         dev->set_multicast_list = uml_net_set_multicast_list;
 430         dev->tx_timeout = uml_net_tx_timeout;
 431         dev->set_mac_address = uml_net_set_mac;
 432         dev->change_mtu = uml_net_change_mtu;
 433         dev->ethtool_ops = &uml_net_ethtool_ops;
 434         dev->watchdog_timeo = (HZ >> 1);
 435         dev->irq = UM_ETH_IRQ;
 436
 437         rtnl_lock();
 438         err = register_netdevice(dev);
 439         rtnl_unlock();
 440         if (err)
 441                 goto out_undo_user_init;
 442
 443         spin_lock(&devices_lock);
 444         list_add(&device->list, &devices);
 445         spin_unlock(&devices_lock);
 446
 447         return;
 448
 449 out_undo_user_init:
 450         if (transport->user->init != NULL)
 451                 (*transport->user->remove)(&lp->user);
 452 out_unregister:
 453         platform_device_unregister(&device->pdev);
 454 out_free_netdev:
 455         free_netdev(dev);
 456 out_free_device: ;
 457         kfree(device);
 458 }
 459
 460 static struct uml_net *find_device(int n)
 461 {
 462         struct uml_net *device;
 463         struct list_head *ele;
 464
 465         spin_lock(&devices_lock);
 466         list_for_each(ele, &devices){
 467                 device = list_entry(ele, struct uml_net, list);
 468                 if(device->index == n)
 469                         goto out;
 470         }
 471         device = NULL;
 472  out:
 473         spin_unlock(&devices_lock);
 474         return device;
 475 }
 476
 477 static int eth_parse(char *str, int *index_out, char **str_out,
 478                      char **error_out)
 479 {
 480         char *end;
 481         int n, err = -EINVAL;;
 482
 483         n = simple_strtoul(str, &end, 0);
 484         if(end == str){
 485                 *error_out = "Bad device number";
 486                 return err;
 487         }
 488
 489         str = end;
 490         if(*str != '='){
 491                 *error_out = "Expected '=' after device number";
 492                 return err;
 493         }
 494
 495         str++;
 496         if(find_device(n)){
 497                 *error_out = "Device already configured";
 498                 return err;
 499         }
 500
 501         *index_out = n;
 502         *str_out = str;
 503         return 0;
 504 }
 505
 506 struct eth_init {
 507         struct list_head list;
 508         char *init;
 509         int index;
 510 };
 511
 512 static DEFINE_SPINLOCK(transports_lock);
 513 static LIST_HEAD(transports);
 514
 515 /* Filled in during early boot */
 516 static LIST_HEAD(eth_cmd_line);
 517
 518 static int check_transport(struct transport *transport, char *eth, int n,
 519                            void **init_out, char **mac_out)
 520 {
 521         int len;
 522
 523         len = strlen(transport->name);
 524         if(strncmp(eth, transport->name, len))
 525                 return 0;
 526
 527         eth += len;
 528         if(*eth == ',')
 529                 eth++;
 530         else if(*eth != '\0')
 531                 return 0;
 532
 533         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 534         if(*init_out == NULL)
 535                 return 1;
 536
 537         if(!transport->setup(eth, mac_out, *init_out)){
 538                 kfree(*init_out);
 539                 *init_out = NULL;
 540         }
 541         return 1;
 542 }
 543
 544 void register_transport(struct transport *new)
 545 {
 546         struct list_head *ele, *next;
 547         struct eth_init *eth;
 548         void *init;
 549         char *mac = NULL;
 550         int match;
 551
 552         spin_lock(&transports_lock);
 553         BUG_ON(!list_empty(&new->list));
 554         list_add(&new->list, &transports);
 555         spin_unlock(&transports_lock);
 556
 557         list_for_each_safe(ele, next, &eth_cmd_line){
 558                 eth = list_entry(ele, struct eth_init, list);
 559                 match = check_transport(new, eth->init, eth->index, &init,
 560                                         &mac);
 561                 if(!match)
 562                         continue;
 563                 else if(init != NULL){
 564                         eth_configure(eth->index, init, mac, new);
 565                         kfree(init);
 566                 }
 567                 list_del(&eth->list);
 568         }
 569 }
 570
 571 static int eth_setup_common(char *str, int index)
 572 {
 573         struct list_head *ele;
 574         struct transport *transport;
 575         void *init;
 576         char *mac = NULL;
 577         int found = 0;
 578
 579         spin_lock(&transports_lock);
 580         list_for_each(ele, &transports){
 581                 transport = list_entry(ele, struct transport, list);
 582                 if(!check_transport(transport, str, index, &init, &mac))
 583                         continue;
 584                 if(init != NULL){
 585                         eth_configure(index, init, mac, transport);
 586                         kfree(init);
 587                 }
 588                 found = 1;
 589                 break;
 590         }
 591
 592         spin_unlock(&transports_lock);
 593         return found;
 594 }
 595
 596 static int eth_setup(char *str)
 597 {
 598         struct eth_init *new;
 599         char *error;
 600         int n, err;
 601
 602         err = eth_parse(str, &n, &str, &error);
 603         if(err){
 604                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 605                        str, error);
 606                 return 1;
 607         }
 608
 609         new = alloc_bootmem(sizeof(*new));
 610         if (new == NULL){
 611                 printk("eth_init : alloc_bootmem failed\n");
 612                 return 1;
 613         }
 614
 615         INIT_LIST_HEAD(&new->list);
 616         new->index = n;
 617         new->init = str;
 618
 619         list_add_tail(&new->list, &eth_cmd_line);
 620         return 1;
 621 }
 622
 623 __setup("eth", eth_setup);
 624 __uml_help(eth_setup,
 625 "eth[0-9]+=<transport>,<options>\n"
 626 "    Configure a network device.\n\n"
 627 );
 628
 629 static int net_config(char *str, char **error_out)
 630 {
 631         int n, err;
 632
 633         err = eth_parse(str, &n, &str, error_out);
 634         if(err)
 635                 return err;
 636
 637         /* This string is broken up and the pieces used by the underlying
 638          * driver.  So, it is freed only if eth_setup_common fails.
 639          */
 640         str = kstrdup(str, GFP_KERNEL);
 641         if(str == NULL){
 642                 *error_out = "net_config failed to strdup string";
 643                 return -ENOMEM;
 644         }
 645         err = !eth_setup_common(str, n);
 646         if(err)
 647                 kfree(str);
 648         return(err);
 649 }
 650
 651 static int net_id(char **str, int *start_out, int *end_out)
 652 {
 653         char *end;
 654         int n;
 655
 656         n = simple_strtoul(*str, &end, 0);
 657         if((*end != '\0') || (end == *str))
 658                 return -1;
 659
 660         *start_out = n;
 661         *end_out = n;
 662         *str = end;
 663         return n;
 664 }
 665
 666 static int net_remove(int n, char **error_out)
 667 {
 668         struct uml_net *device;
 669         struct net_device *dev;
 670         struct uml_net_private *lp;
 671
 672         device = find_device(n);
 673         if(device == NULL)
 674                 return -ENODEV;
 675
 676         dev = device->dev;
 677         lp = dev->priv;
 678         if(lp->fd > 0)
 679                 return -EBUSY;
 680         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 681         unregister_netdev(dev);
 682         platform_device_unregister(&device->pdev);
 683
 684         list_del(&device->list);
 685         kfree(device);
 686         free_netdev(dev);
 687         return 0;
 688 }
 689
 690 static struct mc_device net_mc = {
 691         .list           = LIST_HEAD_INIT(net_mc.list),
 692         .name           = "eth",
 693         .config         = net_config,
 694         .get_config     = NULL,
 695         .id             = net_id,
 696         .remove         = net_remove,
 697 };
 698
 699 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 700                               void *ptr)
 701 {
 702         struct in_ifaddr *ifa = ptr;
 703         struct net_device *dev = ifa->ifa_dev->dev;
 704         struct uml_net_private *lp;
 705         void (*proc)(unsigned char *, unsigned char *, void *);
 706         unsigned char addr_buf[4], netmask_buf[4];
 707
 708         if(dev->open != uml_net_open)
 709                 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 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 731 struct notifier_block uml_inetaddr_notifier = {
 732         .notifier_call          = uml_inetaddr_event,
 733 };
 734
 735 static int uml_net_init(void)
 736 {
 737         struct list_head *ele;
 738         struct uml_net_private *lp;
 739         struct in_device *ip;
 740         struct in_ifaddr *in;
 741
 742         mconsole_register_dev(&net_mc);
 743         register_inetaddr_notifier(&uml_inetaddr_notifier);
 744
 745         /* Devices may have been opened already, so the uml_inetaddr_notifier
 746          * didn't get a chance to run for them.  This fakes it so that
 747          * addresses which have already been set up get handled properly.
 748          */
 749         spin_lock(&opened_lock);
 750         list_for_each(ele, &opened){
 751                 lp = list_entry(ele, struct uml_net_private, list);
 752                 ip = lp->dev->ip_ptr;
 753                 if(ip == NULL)
 754                         continue;
 755                 in = ip->ifa_list;
 756                 while(in != NULL){
 757                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 758                         in = in->ifa_next;
 759                 }
 760         }
 761         spin_unlock(&opened_lock);
 762
 763         return 0;
 764 }
 765
 766 __initcall(uml_net_init);
 767
 768 static void close_devices(void)
 769 {
 770         struct list_head *ele;
 771         struct uml_net_private *lp;
 772
 773         spin_lock(&opened_lock);
 774         list_for_each(ele, &opened){
 775                 lp = list_entry(ele, struct uml_net_private, list);
 776                 free_irq(lp->dev->irq, lp->dev);
 777                 if((lp->close != NULL) && (lp->fd >= 0))
 778                         (*lp->close)(lp->fd, &lp->user);
 779                 if(lp->remove != NULL)
 780                         (*lp->remove)(&lp->user);
 781         }
 782         spin_unlock(&opened_lock);
 783 }
 784
 785 __uml_exitcall(close_devices);
 786
 787 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 788 {
 789         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 790                 struct sk_buff *skb2;
 791
 792                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 793                 dev_kfree_skb(skb);
 794                 skb = skb2;
 795         }
 796         if(skb != NULL) skb_put(skb, extra);
 797         return(skb);
 798 }
 799
 800 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 801                                         void *),
 802                     void *arg)
 803 {
 804         struct net_device *dev = d;
 805         struct in_device *ip = dev->ip_ptr;
 806         struct in_ifaddr *in;
 807         unsigned char address[4], netmask[4];
 808
 809         if(ip == NULL) return;
 810         in = ip->ifa_list;
 811         while(in != NULL){
 812                 memcpy(address, &in->ifa_address, sizeof(address));
 813                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 814                 (*cb)(address, netmask, arg);
 815                 in = in->ifa_next;
 816         }
 817 }
 818
 819 int dev_netmask(void *d, void *m)
 820 {
 821         struct net_device *dev = d;
 822         struct in_device *ip = dev->ip_ptr;
 823         struct in_ifaddr *in;
 824         __be32 *mask_out = m;
 825
 826         if(ip == NULL)
 827                 return(1);
 828
 829         in = ip->ifa_list;
 830         if(in == NULL)
 831                 return(1);
 832
 833         *mask_out = in->ifa_mask;
 834         return(0);
 835 }
 836
 837 void *get_output_buffer(int *len_out)
 838 {
 839         void *ret;
 840
 841         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 842         if(ret) *len_out = PAGE_SIZE;
 843         else *len_out = 0;
 844         return ret;
 845 }
 846
 847 void free_output_buffer(void *buffer)
 848 {
 849         free_pages((unsigned long) buffer, 0);
 850 }
 851
 852 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 853                      char **gate_addr)
 854 {
 855         char *remain;
 856
 857         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 858         if(remain != NULL){
 859                 printk("tap_setup_common - Extra garbage on specification : "
 860                        "'%s'\n", remain);
 861                 return(1);
 862         }
 863
 864         return(0);
 865 }
 866
 867 unsigned short eth_protocol(struct sk_buff *skb)
 868 {
 869         return(eth_type_trans(skb, skb->dev));
 870 }