SAFE public projects git trees. - safe/jmp/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)
 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(addr[0] & 1){
 306                 printk(KERN_ERR
 307                        "Attempt to assign a broadcast ethernet address to a "
 308                        "device disallowed\n");
 309                 goto random;
 310         }
 311         return;
 312
 313 random:
 314         random_ether_addr(addr);
 315 }
 316
 317 static DEFINE_SPINLOCK(devices_lock);
 318 static LIST_HEAD(devices);
 319
 320 static struct platform_driver uml_net_driver = {
 321         .driver = {
 322                 .name  = DRIVER_NAME,
 323         },
 324 };
 325 static int driver_registered;
 326
 327 static void eth_configure(int n, void *init, char *mac,
 328                           struct transport *transport)
 329 {
 330         struct uml_net *device;
 331         struct net_device *dev;
 332         struct uml_net_private *lp;
 333         int save, err, size;
 334
 335         size = transport->private_size + sizeof(struct uml_net_private) +
 336                 sizeof(((struct uml_net_private *) 0)->user);
 337
 338         device = kzalloc(sizeof(*device), GFP_KERNEL);
 339         if (device == NULL) {
 340                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 341                 return;
 342         }
 343
 344         INIT_LIST_HEAD(&device->list);
 345         device->index = n;
 346
 347         setup_etheraddr(mac, device->mac);
 348
 349         printk(KERN_INFO "Netdevice %d ", n);
 350         printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 351                device->mac[0], device->mac[1],
 352                device->mac[2], device->mac[3],
 353                device->mac[4], device->mac[5]);
 354         printk(": ");
 355         dev = alloc_etherdev(size);
 356         if (dev == NULL) {
 357                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 358                 goto out_free_device;
 359         }
 360
 361         lp = dev->priv;
 362         /* This points to the transport private data. It's still clear, but we
 363          * must memset it to 0 *now*. Let's help the drivers. */
 364         memset(lp, 0, size);
 365         INIT_WORK(&lp->work, uml_dev_close);
 366
 367         /* sysfs register */
 368         if (!driver_registered) {
 369                 platform_driver_register(&uml_net_driver);
 370                 driver_registered = 1;
 371         }
 372         device->pdev.id = n;
 373         device->pdev.name = DRIVER_NAME;
 374         if(platform_device_register(&device->pdev))
 375                 goto out_free_netdev;
 376         SET_NETDEV_DEV(dev,&device->pdev.dev);
 377
 378         /* If this name ends up conflicting with an existing registered
 379          * netdevice, that is OK, register_netdev{,ice}() will notice this
 380          * and fail.
 381          */
 382         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 383         device->dev = dev;
 384
 385         /*
 386          * These just fill in a data structure, so there's no failure
 387          * to be worried about.
 388          */
 389         (*transport->kern->init)(dev, init);
 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                   .protocol             = transport->kern->protocol,
 403                   .open                 = transport->user->open,
 404                   .close                = transport->user->close,
 405                   .remove               = transport->user->remove,
 406                   .read                 = transport->kern->read,
 407                   .write                = transport->kern->write,
 408                   .add_address          = transport->user->add_address,
 409                   .delete_address       = transport->user->delete_address,
 410                   .set_mtu              = transport->user->set_mtu,
 411                   .user                 = { save } });
 412
 413         init_timer(&lp->tl);
 414         spin_lock_init(&lp->lock);
 415         lp->tl.function = uml_net_user_timer_expire;
 416         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 417
 418         if ((transport->user->init != NULL) &&
 419             ((*transport->user->init)(&lp->user, dev) != 0))
 420                 goto out_unregister;
 421
 422         set_ether_mac(dev, device->mac);
 423         dev->mtu = transport->user->max_packet;
 424         dev->open = uml_net_open;
 425         dev->hard_start_xmit = uml_net_start_xmit;
 426         dev->stop = uml_net_close;
 427         dev->get_stats = uml_net_get_stats;
 428         dev->set_multicast_list = uml_net_set_multicast_list;
 429         dev->tx_timeout = uml_net_tx_timeout;
 430         dev->set_mac_address = uml_net_set_mac;
 431         dev->change_mtu = uml_net_change_mtu;
 432         dev->ethtool_ops = &uml_net_ethtool_ops;
 433         dev->watchdog_timeo = (HZ >> 1);
 434         dev->irq = UM_ETH_IRQ;
 435
 436         rtnl_lock();
 437         err = register_netdevice(dev);
 438         rtnl_unlock();
 439         if (err)
 440                 goto out_undo_user_init;
 441
 442         spin_lock(&devices_lock);
 443         list_add(&device->list, &devices);
 444         spin_unlock(&devices_lock);
 445
 446         return;
 447
 448 out_undo_user_init:
 449         if (transport->user->init != NULL)
 450                 (*transport->user->remove)(&lp->user);
 451 out_unregister:
 452         platform_device_unregister(&device->pdev);
 453 out_free_netdev:
 454         free_netdev(dev);
 455 out_free_device: ;
 456         kfree(device);
 457 }
 458
 459 static struct uml_net *find_device(int n)
 460 {
 461         struct uml_net *device;
 462         struct list_head *ele;
 463
 464         spin_lock(&devices_lock);
 465         list_for_each(ele, &devices){
 466                 device = list_entry(ele, struct uml_net, list);
 467                 if(device->index == n)
 468                         goto out;
 469         }
 470         device = NULL;
 471  out:
 472         spin_unlock(&devices_lock);
 473         return device;
 474 }
 475
 476 static int eth_parse(char *str, int *index_out, char **str_out,
 477                      char **error_out)
 478 {
 479         char *end;
 480         int n, err = -EINVAL;;
 481
 482         n = simple_strtoul(str, &end, 0);
 483         if(end == str){
 484                 *error_out = "Bad device number";
 485                 return err;
 486         }
 487
 488         str = end;
 489         if(*str != '='){
 490                 *error_out = "Expected '=' after device number";
 491                 return err;
 492         }
 493
 494         str++;
 495         if(find_device(n)){
 496                 *error_out = "Device already configured";
 497                 return err;
 498         }
 499
 500         *index_out = n;
 501         *str_out = str;
 502         return 0;
 503 }
 504
 505 struct eth_init {
 506         struct list_head list;
 507         char *init;
 508         int index;
 509 };
 510
 511 static DEFINE_SPINLOCK(transports_lock);
 512 static LIST_HEAD(transports);
 513
 514 /* Filled in during early boot */
 515 static LIST_HEAD(eth_cmd_line);
 516
 517 static int check_transport(struct transport *transport, char *eth, int n,
 518                            void **init_out, char **mac_out)
 519 {
 520         int len;
 521
 522         len = strlen(transport->name);
 523         if(strncmp(eth, transport->name, len))
 524                 return 0;
 525
 526         eth += len;
 527         if(*eth == ',')
 528                 eth++;
 529         else if(*eth != '\0')
 530                 return 0;
 531
 532         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 533         if(*init_out == NULL)
 534                 return 1;
 535
 536         if(!transport->setup(eth, mac_out, *init_out)){
 537                 kfree(*init_out);
 538                 *init_out = NULL;
 539         }
 540         return 1;
 541 }
 542
 543 void register_transport(struct transport *new)
 544 {
 545         struct list_head *ele, *next;
 546         struct eth_init *eth;
 547         void *init;
 548         char *mac = NULL;
 549         int match;
 550
 551         spin_lock(&transports_lock);
 552         BUG_ON(!list_empty(&new->list));
 553         list_add(&new->list, &transports);
 554         spin_unlock(&transports_lock);
 555
 556         list_for_each_safe(ele, next, &eth_cmd_line){
 557                 eth = list_entry(ele, struct eth_init, list);
 558                 match = check_transport(new, eth->init, eth->index, &init,
 559                                         &mac);
 560                 if(!match)
 561                         continue;
 562                 else if(init != NULL){
 563                         eth_configure(eth->index, init, mac, new);
 564                         kfree(init);
 565                 }
 566                 list_del(&eth->list);
 567         }
 568 }
 569
 570 static int eth_setup_common(char *str, int index)
 571 {
 572         struct list_head *ele;
 573         struct transport *transport;
 574         void *init;
 575         char *mac = NULL;
 576         int found = 0;
 577
 578         spin_lock(&transports_lock);
 579         list_for_each(ele, &transports){
 580                 transport = list_entry(ele, struct transport, list);
 581                 if(!check_transport(transport, str, index, &init, &mac))
 582                         continue;
 583                 if(init != NULL){
 584                         eth_configure(index, init, mac, transport);
 585                         kfree(init);
 586                 }
 587                 found = 1;
 588                 break;
 589         }
 590
 591         spin_unlock(&transports_lock);
 592         return found;
 593 }
 594
 595 static int eth_setup(char *str)
 596 {
 597         struct eth_init *new;
 598         char *error;
 599         int n, err;
 600
 601         err = eth_parse(str, &n, &str, &error);
 602         if(err){
 603                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 604                        str, error);
 605                 return 1;
 606         }
 607
 608         new = alloc_bootmem(sizeof(*new));
 609         if (new == NULL){
 610                 printk("eth_init : alloc_bootmem failed\n");
 611                 return 1;
 612         }
 613
 614         INIT_LIST_HEAD(&new->list);
 615         new->index = n;
 616         new->init = str;
 617
 618         list_add_tail(&new->list, &eth_cmd_line);
 619         return 1;
 620 }
 621
 622 __setup("eth", eth_setup);
 623 __uml_help(eth_setup,
 624 "eth[0-9]+=<transport>,<options>\n"
 625 "    Configure a network device.\n\n"
 626 );
 627
 628 static int net_config(char *str, char **error_out)
 629 {
 630         int n, err;
 631
 632         err = eth_parse(str, &n, &str, error_out);
 633         if(err)
 634                 return err;
 635
 636         /* This string is broken up and the pieces used by the underlying
 637          * driver.  So, it is freed only if eth_setup_common fails.
 638          */
 639         str = kstrdup(str, GFP_KERNEL);
 640         if(str == NULL){
 641                 *error_out = "net_config failed to strdup string";
 642                 return -ENOMEM;
 643         }
 644         err = !eth_setup_common(str, n);
 645         if(err)
 646                 kfree(str);
 647         return(err);
 648 }
 649
 650 static int net_id(char **str, int *start_out, int *end_out)
 651 {
 652         char *end;
 653         int n;
 654
 655         n = simple_strtoul(*str, &end, 0);
 656         if((*end != '\0') || (end == *str))
 657                 return -1;
 658
 659         *start_out = n;
 660         *end_out = n;
 661         *str = end;
 662         return n;
 663 }
 664
 665 static int net_remove(int n, char **error_out)
 666 {
 667         struct uml_net *device;
 668         struct net_device *dev;
 669         struct uml_net_private *lp;
 670
 671         device = find_device(n);
 672         if(device == NULL)
 673                 return -ENODEV;
 674
 675         dev = device->dev;
 676         lp = dev->priv;
 677         if(lp->fd > 0)
 678                 return -EBUSY;
 679         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 680         unregister_netdev(dev);
 681         platform_device_unregister(&device->pdev);
 682
 683         list_del(&device->list);
 684         kfree(device);
 685         free_netdev(dev);
 686         return 0;
 687 }
 688
 689 static struct mc_device net_mc = {
 690         .list           = LIST_HEAD_INIT(net_mc.list),
 691         .name           = "eth",
 692         .config         = net_config,
 693         .get_config     = NULL,
 694         .id             = net_id,
 695         .remove         = net_remove,
 696 };
 697
 698 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 699                               void *ptr)
 700 {
 701         struct in_ifaddr *ifa = ptr;
 702         struct net_device *dev = ifa->ifa_dev->dev;
 703         struct uml_net_private *lp;
 704         void (*proc)(unsigned char *, unsigned char *, void *);
 705         unsigned char addr_buf[4], netmask_buf[4];
 706
 707         if(dev->open != uml_net_open)
 708                 return NOTIFY_DONE;
 709
 710         lp = dev->priv;
 711
 712         proc = NULL;
 713         switch (event){
 714         case NETDEV_UP:
 715                 proc = lp->add_address;
 716                 break;
 717         case NETDEV_DOWN:
 718                 proc = lp->delete_address;
 719                 break;
 720         }
 721         if(proc != NULL){
 722                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 723                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 724                 (*proc)(addr_buf, netmask_buf, &lp->user);
 725         }
 726         return NOTIFY_DONE;
 727 }
 728
 729 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 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         spin_lock(&opened_lock);
 749         list_for_each(ele, &opened){
 750                 lp = list_entry(ele, struct uml_net_private, list);
 751                 ip = lp->dev->ip_ptr;
 752                 if(ip == NULL)
 753                         continue;
 754                 in = ip->ifa_list;
 755                 while(in != NULL){
 756                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 757                         in = in->ifa_next;
 758                 }
 759         }
 760         spin_unlock(&opened_lock);
 761
 762         return 0;
 763 }
 764
 765 __initcall(uml_net_init);
 766
 767 static void close_devices(void)
 768 {
 769         struct list_head *ele;
 770         struct uml_net_private *lp;
 771
 772         spin_lock(&opened_lock);
 773         list_for_each(ele, &opened){
 774                 lp = list_entry(ele, struct uml_net_private, list);
 775                 free_irq(lp->dev->irq, lp->dev);
 776                 if((lp->close != NULL) && (lp->fd >= 0))
 777                         (*lp->close)(lp->fd, &lp->user);
 778                 if(lp->remove != NULL)
 779                         (*lp->remove)(&lp->user);
 780         }
 781         spin_unlock(&opened_lock);
 782 }
 783
 784 __uml_exitcall(close_devices);
 785
 786 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 787 {
 788         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 789                 struct sk_buff *skb2;
 790
 791                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 792                 dev_kfree_skb(skb);
 793                 skb = skb2;
 794         }
 795         if(skb != NULL) skb_put(skb, extra);
 796         return(skb);
 797 }
 798
 799 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 800                                         void *),
 801                     void *arg)
 802 {
 803         struct net_device *dev = d;
 804         struct in_device *ip = dev->ip_ptr;
 805         struct in_ifaddr *in;
 806         unsigned char address[4], netmask[4];
 807
 808         if(ip == NULL) return;
 809         in = ip->ifa_list;
 810         while(in != NULL){
 811                 memcpy(address, &in->ifa_address, sizeof(address));
 812                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 813                 (*cb)(address, netmask, arg);
 814                 in = in->ifa_next;
 815         }
 816 }
 817
 818 int dev_netmask(void *d, void *m)
 819 {
 820         struct net_device *dev = d;
 821         struct in_device *ip = dev->ip_ptr;
 822         struct in_ifaddr *in;
 823         __be32 *mask_out = m;
 824
 825         if(ip == NULL)
 826                 return(1);
 827
 828         in = ip->ifa_list;
 829         if(in == NULL)
 830                 return(1);
 831
 832         *mask_out = in->ifa_mask;
 833         return(0);
 834 }
 835
 836 void *get_output_buffer(int *len_out)
 837 {
 838         void *ret;
 839
 840         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 841         if(ret) *len_out = PAGE_SIZE;
 842         else *len_out = 0;
 843         return ret;
 844 }
 845
 846 void free_output_buffer(void *buffer)
 847 {
 848         free_pages((unsigned long) buffer, 0);
 849 }
 850
 851 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 852                      char **gate_addr)
 853 {
 854         char *remain;
 855
 856         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 857         if(remain != NULL){
 858                 printk("tap_setup_common - Extra garbage on specification : "
 859                        "'%s'\n", remain);
 860                 return(1);
 861         }
 862
 863         return(0);
 864 }
 865
 866 unsigned short eth_protocol(struct sk_buff *skb)
 867 {
 868         return(eth_type_trans(skb, skb->dev));
 869 }