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 "kern_util.h"
  25 #include "net_kern.h"
  26 #include "net_user.h"
  27 #include "mconsole_kern.h"
  28 #include "init.h"
  29 #include "irq_user.h"
  30 #include "irq_kern.h"
  31
  32 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
  33 {
  34         memcpy(dev->dev_addr, addr, ETH_ALEN);
  35 }
  36
  37 #define DRIVER_NAME "uml-netdev"
  38
  39 static DEFINE_SPINLOCK(opened_lock);
  40 static LIST_HEAD(opened);
  41
  42 static int uml_net_rx(struct net_device *dev)
  43 {
  44         struct uml_net_private *lp = dev->priv;
  45         int pkt_len;
  46         struct sk_buff *skb;
  47
  48         /* If we can't allocate memory, try again next round. */
  49         skb = dev_alloc_skb(dev->mtu);
  50         if (skb == NULL) {
  51                 lp->stats.rx_dropped++;
  52                 return 0;
  53         }
  54
  55         skb->dev = dev;
  56         skb_put(skb, dev->mtu);
  57         skb_reset_mac_header(skb);
  58         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  59
  60         if (pkt_len > 0) {
  61                 skb_trim(skb, pkt_len);
  62                 skb->protocol = (*lp->protocol)(skb);
  63                 netif_rx(skb);
  64
  65                 lp->stats.rx_bytes += skb->len;
  66                 lp->stats.rx_packets++;
  67                 return pkt_len;
  68         }
  69
  70         kfree_skb(skb);
  71         return pkt_len;
  72 }
  73
  74 static void uml_dev_close(struct work_struct *work)
  75 {
  76         struct uml_net_private *lp =
  77                 container_of(work, struct uml_net_private, work);
  78         dev_close(lp->dev);
  79 }
  80
  81 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
  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                 printk(KERN_ERR
  94                        "Device '%s' read returned %d, shutting it down\n",
  95                        dev->name, err);
  96                 /* dev_close can't be called in interrupt context, and takes
  97                  * again lp->lock.
  98                  * And dev_close() can be safely called multiple times on the
  99                  * same device, since it tests for (dev->flags & IFF_UP). So
 100                  * there's no harm in delaying the device shutdown.
 101                  * Furthermore, the workqueue will not re-enqueue an already
 102                  * enqueued work item. */
 103                 schedule_work(&lp->work);
 104                 goto out;
 105         }
 106         reactivate_fd(lp->fd, UM_ETH_IRQ);
 107
 108 out:
 109         spin_unlock(&lp->lock);
 110         return IRQ_HANDLED;
 111 }
 112
 113 static int uml_net_open(struct net_device *dev)
 114 {
 115         struct uml_net_private *lp = dev->priv;
 116         int err;
 117
 118         if(lp->fd >= 0){
 119                 err = -ENXIO;
 120                 goto out;
 121         }
 122
 123         lp->fd = (*lp->open)(&lp->user);
 124         if(lp->fd < 0){
 125                 err = lp->fd;
 126                 goto out;
 127         }
 128
 129         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 130                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
 131         if(err != 0){
 132                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 133                 err = -ENETUNREACH;
 134                 goto out_close;
 135         }
 136
 137         lp->tl.data = (unsigned long) &lp->user;
 138         netif_start_queue(dev);
 139
 140         /* clear buffer - it can happen that the host side of the interface
 141          * is full when we get here.  In this case, new data is never queued,
 142          * SIGIOs never arrive, and the net never works.
 143          */
 144         while((err = uml_net_rx(dev)) > 0) ;
 145
 146         spin_lock(&opened_lock);
 147         list_add(&lp->list, &opened);
 148         spin_unlock(&opened_lock);
 149
 150         return 0;
 151 out_close:
 152         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 153         lp->fd = -1;
 154 out:
 155         return err;
 156 }
 157
 158 static int uml_net_close(struct net_device *dev)
 159 {
 160         struct uml_net_private *lp = dev->priv;
 161
 162         netif_stop_queue(dev);
 163
 164         free_irq(dev->irq, dev);
 165         if(lp->close != NULL)
 166                 (*lp->close)(lp->fd, &lp->user);
 167         lp->fd = -1;
 168
 169         spin_lock(&opened_lock);
 170         list_del(&lp->list);
 171         spin_unlock(&opened_lock);
 172
 173         return 0;
 174 }
 175
 176 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 177 {
 178         struct uml_net_private *lp = dev->priv;
 179         unsigned long flags;
 180         int len;
 181
 182         netif_stop_queue(dev);
 183
 184         spin_lock_irqsave(&lp->lock, flags);
 185
 186         len = (*lp->write)(lp->fd, &skb, lp);
 187
 188         if(len == skb->len) {
 189                 lp->stats.tx_packets++;
 190                 lp->stats.tx_bytes += skb->len;
 191                 dev->trans_start = jiffies;
 192                 netif_start_queue(dev);
 193
 194                 /* this is normally done in the interrupt when tx finishes */
 195                 netif_wake_queue(dev);
 196         }
 197         else if(len == 0){
 198                 netif_start_queue(dev);
 199                 lp->stats.tx_dropped++;
 200         }
 201         else {
 202                 netif_start_queue(dev);
 203                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 204         }
 205
 206         spin_unlock_irqrestore(&lp->lock, flags);
 207
 208         dev_kfree_skb(skb);
 209
 210         return 0;
 211 }
 212
 213 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 214 {
 215         struct uml_net_private *lp = dev->priv;
 216         return &lp->stats;
 217 }
 218
 219 static void uml_net_set_multicast_list(struct net_device *dev)
 220 {
 221         if (dev->flags & IFF_PROMISC) return;
 222         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 223         else dev->flags &= ~IFF_ALLMULTI;
 224 }
 225
 226 static void uml_net_tx_timeout(struct net_device *dev)
 227 {
 228         dev->trans_start = jiffies;
 229         netif_wake_queue(dev);
 230 }
 231
 232 static int uml_net_set_mac(struct net_device *dev, void *addr)
 233 {
 234         struct uml_net_private *lp = dev->priv;
 235         struct sockaddr *hwaddr = addr;
 236
 237         spin_lock_irq(&lp->lock);
 238         set_ether_mac(dev, hwaddr->sa_data);
 239         spin_unlock_irq(&lp->lock);
 240
 241         return 0;
 242 }
 243
 244 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 245 {
 246         struct uml_net_private *lp = dev->priv;
 247         int err = 0;
 248
 249         spin_lock_irq(&lp->lock);
 250
 251         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 252         if(new_mtu < 0){
 253                 err = new_mtu;
 254                 goto out;
 255         }
 256
 257         dev->mtu = new_mtu;
 258
 259  out:
 260         spin_unlock_irq(&lp->lock);
 261         return err;
 262 }
 263
 264 static void uml_net_get_drvinfo(struct net_device *dev,
 265                                 struct ethtool_drvinfo *info)
 266 {
 267         strcpy(info->driver, DRIVER_NAME);
 268         strcpy(info->version, "42");
 269 }
 270
 271 static struct ethtool_ops uml_net_ethtool_ops = {
 272         .get_drvinfo    = uml_net_get_drvinfo,
 273         .get_link       = ethtool_op_get_link,
 274 };
 275
 276 void uml_net_user_timer_expire(unsigned long _conn)
 277 {
 278 #ifdef undef
 279         struct connection *conn = (struct connection *)_conn;
 280
 281         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 282         do_connect(conn);
 283 #endif
 284 }
 285
 286 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
 287 {
 288         char *end;
 289         int i;
 290
 291         if(str == NULL)
 292                 goto random;
 293
 294         for(i=0;i<6;i++){
 295                 addr[i] = simple_strtoul(str, &end, 16);
 296                 if((end == str) ||
 297                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 298                         printk(KERN_ERR
 299                                "setup_etheraddr: failed to parse '%s' "
 300                                "as an ethernet address\n", str);
 301                         goto random;
 302                 }
 303                 str = end + 1;
 304         }
 305         if (is_multicast_ether_addr(addr)) {
 306                 printk(KERN_ERR
 307                        "Attempt to assign a multicast ethernet address to a "
 308                        "device disallowed\n");
 309                 goto random;
 310         }
 311         if (!is_valid_ether_addr(addr)) {
 312                 printk(KERN_ERR
 313                        "Attempt to assign an invalid ethernet address to a "
 314                        "device disallowed\n");
 315                 goto random;
 316         }
 317         if (!is_local_ether_addr(addr)) {
 318                 printk(KERN_WARNING
 319                        "Warning: attempt to assign a globally valid ethernet address to a "
 320                        "device\n");
 321                 printk(KERN_WARNING "You should better enable the 2nd rightmost bit "
 322                       "in the first byte of the MAC, i.e. "
 323                       "%02x:%02x:%02x:%02x:%02x:%02x\n",
 324                       addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], addr[5]);
 325         }
 326         return;
 327
 328 random:
 329         printk(KERN_INFO
 330                "Choosing a random ethernet address for device %s\n", name);
 331         random_ether_addr(addr);
 332 }
 333
 334 static DEFINE_SPINLOCK(devices_lock);
 335 static LIST_HEAD(devices);
 336
 337 static struct platform_driver uml_net_driver = {
 338         .driver = {
 339                 .name  = DRIVER_NAME,
 340         },
 341 };
 342 static int driver_registered;
 343
 344 static void eth_configure(int n, void *init, char *mac,
 345                           struct transport *transport)
 346 {
 347         struct uml_net *device;
 348         struct net_device *dev;
 349         struct uml_net_private *lp;
 350         int err, size;
 351
 352         size = transport->private_size + sizeof(struct uml_net_private);
 353
 354         device = kzalloc(sizeof(*device), GFP_KERNEL);
 355         if (device == NULL) {
 356                 printk(KERN_ERR "eth_configure failed to allocate struct "
 357                        "uml_net\n");
 358                 return;
 359         }
 360
 361         dev = alloc_etherdev(size);
 362         if (dev == NULL) {
 363                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 364                        "net_device for eth%d\n", n);
 365                 goto out_free_device;
 366         }
 367
 368         INIT_LIST_HEAD(&device->list);
 369         device->index = n;
 370
 371         /* If this name ends up conflicting with an existing registered
 372          * netdevice, that is OK, register_netdev{,ice}() will notice this
 373          * and fail.
 374          */
 375         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 376
 377         setup_etheraddr(mac, device->mac, dev->name);
 378
 379         printk(KERN_INFO "Netdevice %d ", n);
 380         printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 381                device->mac[0], device->mac[1],
 382                device->mac[2], device->mac[3],
 383                device->mac[4], device->mac[5]);
 384         printk(": ");
 385
 386         lp = dev->priv;
 387         /* This points to the transport private data. It's still clear, but we
 388          * must memset it to 0 *now*. Let's help the drivers. */
 389         memset(lp, 0, size);
 390         INIT_WORK(&lp->work, uml_dev_close);
 391
 392         /* sysfs register */
 393         if (!driver_registered) {
 394                 platform_driver_register(&uml_net_driver);
 395                 driver_registered = 1;
 396         }
 397         device->pdev.id = n;
 398         device->pdev.name = DRIVER_NAME;
 399         if(platform_device_register(&device->pdev))
 400                 goto out_free_netdev;
 401         SET_NETDEV_DEV(dev,&device->pdev.dev);
 402
 403         device->dev = dev;
 404
 405         /*
 406          * These just fill in a data structure, so there's no failure
 407          * to be worried about.
 408          */
 409         (*transport->kern->init)(dev, init);
 410
 411         *lp = ((struct uml_net_private)
 412                 { .list                 = LIST_HEAD_INIT(lp->list),
 413                   .dev                  = dev,
 414                   .fd                   = -1,
 415                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 416                   .protocol             = transport->kern->protocol,
 417                   .open                 = transport->user->open,
 418                   .close                = transport->user->close,
 419                   .remove               = transport->user->remove,
 420                   .read                 = transport->kern->read,
 421                   .write                = transport->kern->write,
 422                   .add_address          = transport->user->add_address,
 423                   .delete_address       = transport->user->delete_address,
 424                   .set_mtu              = transport->user->set_mtu });
 425
 426         init_timer(&lp->tl);
 427         spin_lock_init(&lp->lock);
 428         lp->tl.function = uml_net_user_timer_expire;
 429         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 430
 431         if ((transport->user->init != NULL) &&
 432             ((*transport->user->init)(&lp->user, dev) != 0))
 433                 goto out_unregister;
 434
 435         set_ether_mac(dev, device->mac);
 436         dev->mtu = transport->user->max_packet;
 437         dev->open = uml_net_open;
 438         dev->hard_start_xmit = uml_net_start_xmit;
 439         dev->stop = uml_net_close;
 440         dev->get_stats = uml_net_get_stats;
 441         dev->set_multicast_list = uml_net_set_multicast_list;
 442         dev->tx_timeout = uml_net_tx_timeout;
 443         dev->set_mac_address = uml_net_set_mac;
 444         dev->change_mtu = uml_net_change_mtu;
 445         dev->ethtool_ops = &uml_net_ethtool_ops;
 446         dev->watchdog_timeo = (HZ >> 1);
 447         dev->irq = UM_ETH_IRQ;
 448
 449         rtnl_lock();
 450         err = register_netdevice(dev);
 451         rtnl_unlock();
 452         if (err)
 453                 goto out_undo_user_init;
 454
 455         spin_lock(&devices_lock);
 456         list_add(&device->list, &devices);
 457         spin_unlock(&devices_lock);
 458
 459         return;
 460
 461 out_undo_user_init:
 462         if (transport->user->remove != NULL)
 463                 (*transport->user->remove)(&lp->user);
 464 out_unregister:
 465         platform_device_unregister(&device->pdev);
 466 out_free_netdev:
 467         free_netdev(dev);
 468 out_free_device:
 469         kfree(device);
 470 }
 471
 472 static struct uml_net *find_device(int n)
 473 {
 474         struct uml_net *device;
 475         struct list_head *ele;
 476
 477         spin_lock(&devices_lock);
 478         list_for_each(ele, &devices){
 479                 device = list_entry(ele, struct uml_net, list);
 480                 if(device->index == n)
 481                         goto out;
 482         }
 483         device = NULL;
 484  out:
 485         spin_unlock(&devices_lock);
 486         return device;
 487 }
 488
 489 static int eth_parse(char *str, int *index_out, char **str_out,
 490                      char **error_out)
 491 {
 492         char *end;
 493         int n, err = -EINVAL;;
 494
 495         n = simple_strtoul(str, &end, 0);
 496         if(end == str){
 497                 *error_out = "Bad device number";
 498                 return err;
 499         }
 500
 501         str = end;
 502         if(*str != '='){
 503                 *error_out = "Expected '=' after device number";
 504                 return err;
 505         }
 506
 507         str++;
 508         if(find_device(n)){
 509                 *error_out = "Device already configured";
 510                 return err;
 511         }
 512
 513         *index_out = n;
 514         *str_out = str;
 515         return 0;
 516 }
 517
 518 struct eth_init {
 519         struct list_head list;
 520         char *init;
 521         int index;
 522 };
 523
 524 static DEFINE_SPINLOCK(transports_lock);
 525 static LIST_HEAD(transports);
 526
 527 /* Filled in during early boot */
 528 static LIST_HEAD(eth_cmd_line);
 529
 530 static int check_transport(struct transport *transport, char *eth, int n,
 531                            void **init_out, char **mac_out)
 532 {
 533         int len;
 534
 535         len = strlen(transport->name);
 536         if(strncmp(eth, transport->name, len))
 537                 return 0;
 538
 539         eth += len;
 540         if(*eth == ',')
 541                 eth++;
 542         else if(*eth != '\0')
 543                 return 0;
 544
 545         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 546         if(*init_out == NULL)
 547                 return 1;
 548
 549         if(!transport->setup(eth, mac_out, *init_out)){
 550                 kfree(*init_out);
 551                 *init_out = NULL;
 552         }
 553         return 1;
 554 }
 555
 556 void register_transport(struct transport *new)
 557 {
 558         struct list_head *ele, *next;
 559         struct eth_init *eth;
 560         void *init;
 561         char *mac = NULL;
 562         int match;
 563
 564         spin_lock(&transports_lock);
 565         BUG_ON(!list_empty(&new->list));
 566         list_add(&new->list, &transports);
 567         spin_unlock(&transports_lock);
 568
 569         list_for_each_safe(ele, next, &eth_cmd_line){
 570                 eth = list_entry(ele, struct eth_init, list);
 571                 match = check_transport(new, eth->init, eth->index, &init,
 572                                         &mac);
 573                 if(!match)
 574                         continue;
 575                 else if(init != NULL){
 576                         eth_configure(eth->index, init, mac, new);
 577                         kfree(init);
 578                 }
 579                 list_del(&eth->list);
 580         }
 581 }
 582
 583 static int eth_setup_common(char *str, int index)
 584 {
 585         struct list_head *ele;
 586         struct transport *transport;
 587         void *init;
 588         char *mac = NULL;
 589         int found = 0;
 590
 591         spin_lock(&transports_lock);
 592         list_for_each(ele, &transports){
 593                 transport = list_entry(ele, struct transport, list);
 594                 if(!check_transport(transport, str, index, &init, &mac))
 595                         continue;
 596                 if(init != NULL){
 597                         eth_configure(index, init, mac, transport);
 598                         kfree(init);
 599                 }
 600                 found = 1;
 601                 break;
 602         }
 603
 604         spin_unlock(&transports_lock);
 605         return found;
 606 }
 607
 608 static int eth_setup(char *str)
 609 {
 610         struct eth_init *new;
 611         char *error;
 612         int n, err;
 613
 614         err = eth_parse(str, &n, &str, &error);
 615         if(err){
 616                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 617                        str, error);
 618                 return 1;
 619         }
 620
 621         new = alloc_bootmem(sizeof(*new));
 622         if (new == NULL){
 623                 printk("eth_init : alloc_bootmem failed\n");
 624                 return 1;
 625         }
 626
 627         INIT_LIST_HEAD(&new->list);
 628         new->index = n;
 629         new->init = str;
 630
 631         list_add_tail(&new->list, &eth_cmd_line);
 632         return 1;
 633 }
 634
 635 __setup("eth", eth_setup);
 636 __uml_help(eth_setup,
 637 "eth[0-9]+=<transport>,<options>\n"
 638 "    Configure a network device.\n\n"
 639 );
 640
 641 static int net_config(char *str, char **error_out)
 642 {
 643         int n, err;
 644
 645         err = eth_parse(str, &n, &str, error_out);
 646         if(err)
 647                 return err;
 648
 649         /* This string is broken up and the pieces used by the underlying
 650          * driver.  So, it is freed only if eth_setup_common fails.
 651          */
 652         str = kstrdup(str, GFP_KERNEL);
 653         if(str == NULL){
 654                 *error_out = "net_config failed to strdup string";
 655                 return -ENOMEM;
 656         }
 657         err = !eth_setup_common(str, n);
 658         if(err)
 659                 kfree(str);
 660         return(err);
 661 }
 662
 663 static int net_id(char **str, int *start_out, int *end_out)
 664 {
 665         char *end;
 666         int n;
 667
 668         n = simple_strtoul(*str, &end, 0);
 669         if((*end != '\0') || (end == *str))
 670                 return -1;
 671
 672         *start_out = n;
 673         *end_out = n;
 674         *str = end;
 675         return n;
 676 }
 677
 678 static int net_remove(int n, char **error_out)
 679 {
 680         struct uml_net *device;
 681         struct net_device *dev;
 682         struct uml_net_private *lp;
 683
 684         device = find_device(n);
 685         if(device == NULL)
 686                 return -ENODEV;
 687
 688         dev = device->dev;
 689         lp = dev->priv;
 690         if(lp->fd > 0)
 691                 return -EBUSY;
 692         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 693         unregister_netdev(dev);
 694         platform_device_unregister(&device->pdev);
 695
 696         list_del(&device->list);
 697         kfree(device);
 698         free_netdev(dev);
 699         return 0;
 700 }
 701
 702 static struct mc_device net_mc = {
 703         .list           = LIST_HEAD_INIT(net_mc.list),
 704         .name           = "eth",
 705         .config         = net_config,
 706         .get_config     = NULL,
 707         .id             = net_id,
 708         .remove         = net_remove,
 709 };
 710
 711 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 712                               void *ptr)
 713 {
 714         struct in_ifaddr *ifa = ptr;
 715         struct net_device *dev = ifa->ifa_dev->dev;
 716         struct uml_net_private *lp;
 717         void (*proc)(unsigned char *, unsigned char *, void *);
 718         unsigned char addr_buf[4], netmask_buf[4];
 719
 720         if(dev->open != uml_net_open)
 721                 return NOTIFY_DONE;
 722
 723         lp = dev->priv;
 724
 725         proc = NULL;
 726         switch (event){
 727         case NETDEV_UP:
 728                 proc = lp->add_address;
 729                 break;
 730         case NETDEV_DOWN:
 731                 proc = lp->delete_address;
 732                 break;
 733         }
 734         if(proc != NULL){
 735                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 736                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 737                 (*proc)(addr_buf, netmask_buf, &lp->user);
 738         }
 739         return NOTIFY_DONE;
 740 }
 741
 742 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 743 struct notifier_block uml_inetaddr_notifier = {
 744         .notifier_call          = uml_inetaddr_event,
 745 };
 746
 747 static int uml_net_init(void)
 748 {
 749         struct list_head *ele;
 750         struct uml_net_private *lp;
 751         struct in_device *ip;
 752         struct in_ifaddr *in;
 753
 754         mconsole_register_dev(&net_mc);
 755         register_inetaddr_notifier(&uml_inetaddr_notifier);
 756
 757         /* Devices may have been opened already, so the uml_inetaddr_notifier
 758          * didn't get a chance to run for them.  This fakes it so that
 759          * addresses which have already been set up get handled properly.
 760          */
 761         spin_lock(&opened_lock);
 762         list_for_each(ele, &opened){
 763                 lp = list_entry(ele, struct uml_net_private, list);
 764                 ip = lp->dev->ip_ptr;
 765                 if(ip == NULL)
 766                         continue;
 767                 in = ip->ifa_list;
 768                 while(in != NULL){
 769                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 770                         in = in->ifa_next;
 771                 }
 772         }
 773         spin_unlock(&opened_lock);
 774
 775         return 0;
 776 }
 777
 778 __initcall(uml_net_init);
 779
 780 static void close_devices(void)
 781 {
 782         struct list_head *ele;
 783         struct uml_net_private *lp;
 784
 785         spin_lock(&opened_lock);
 786         list_for_each(ele, &opened){
 787                 lp = list_entry(ele, struct uml_net_private, list);
 788                 free_irq(lp->dev->irq, lp->dev);
 789                 if((lp->close != NULL) && (lp->fd >= 0))
 790                         (*lp->close)(lp->fd, &lp->user);
 791                 if(lp->remove != NULL)
 792                         (*lp->remove)(&lp->user);
 793         }
 794         spin_unlock(&opened_lock);
 795 }
 796
 797 __uml_exitcall(close_devices);
 798
 799 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 800 {
 801         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 802                 struct sk_buff *skb2;
 803
 804                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 805                 dev_kfree_skb(skb);
 806                 skb = skb2;
 807         }
 808         if(skb != NULL) skb_put(skb, extra);
 809         return(skb);
 810 }
 811
 812 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 813                                         void *),
 814                     void *arg)
 815 {
 816         struct net_device *dev = d;
 817         struct in_device *ip = dev->ip_ptr;
 818         struct in_ifaddr *in;
 819         unsigned char address[4], netmask[4];
 820
 821         if(ip == NULL) return;
 822         in = ip->ifa_list;
 823         while(in != NULL){
 824                 memcpy(address, &in->ifa_address, sizeof(address));
 825                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 826                 (*cb)(address, netmask, arg);
 827                 in = in->ifa_next;
 828         }
 829 }
 830
 831 int dev_netmask(void *d, void *m)
 832 {
 833         struct net_device *dev = d;
 834         struct in_device *ip = dev->ip_ptr;
 835         struct in_ifaddr *in;
 836         __be32 *mask_out = m;
 837
 838         if(ip == NULL)
 839                 return(1);
 840
 841         in = ip->ifa_list;
 842         if(in == NULL)
 843                 return(1);
 844
 845         *mask_out = in->ifa_mask;
 846         return(0);
 847 }
 848
 849 void *get_output_buffer(int *len_out)
 850 {
 851         void *ret;
 852
 853         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 854         if(ret) *len_out = PAGE_SIZE;
 855         else *len_out = 0;
 856         return ret;
 857 }
 858
 859 void free_output_buffer(void *buffer)
 860 {
 861         free_pages((unsigned long) buffer, 0);
 862 }
 863
 864 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 865                      char **gate_addr)
 866 {
 867         char *remain;
 868
 869         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 870         if(remain != NULL){
 871                 printk("tap_setup_common - Extra garbage on specification : "
 872                        "'%s'\n", remain);
 873                 return(1);
 874         }
 875
 876         return(0);
 877 }
 878
 879 unsigned short eth_protocol(struct sk_buff *skb)
 880 {
 881         return(eth_type_trans(skb, skb->dev));
 882 }