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(void* dev)
  76 {
  77         dev_close( (struct net_device *) dev);
  78 }
  79
  80 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
  81 {
  82         struct net_device *dev = dev_id;
  83         struct uml_net_private *lp = dev->priv;
  84         int err;
  85
  86         if(!netif_running(dev))
  87                 return(IRQ_NONE);
  88
  89         spin_lock(&lp->lock);
  90         while((err = uml_net_rx(dev)) > 0) ;
  91         if(err < 0) {
  92                 DECLARE_WORK(close_work, uml_dev_close, dev);
  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                 schedule_work(&close_work);
 102 #error this is not permitted - close_work will go out of scope
 103                 goto out;
 104         }
 105         reactivate_fd(lp->fd, UM_ETH_IRQ);
 106
 107 out:
 108         spin_unlock(&lp->lock);
 109         return(IRQ_HANDLED);
 110 }
 111
 112 static int uml_net_open(struct net_device *dev)
 113 {
 114         struct uml_net_private *lp = dev->priv;
 115         int err;
 116
 117         if(lp->fd >= 0){
 118                 err = -ENXIO;
 119                 goto out;
 120         }
 121
 122         lp->fd = (*lp->open)(&lp->user);
 123         if(lp->fd < 0){
 124                 err = lp->fd;
 125                 goto out;
 126         }
 127
 128         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 129                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
 130         if(err != 0){
 131                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 132                 err = -ENETUNREACH;
 133                 goto out_close;
 134         }
 135
 136         lp->tl.data = (unsigned long) &lp->user;
 137         netif_start_queue(dev);
 138
 139         /* clear buffer - it can happen that the host side of the interface
 140          * is full when we get here.  In this case, new data is never queued,
 141          * SIGIOs never arrive, and the net never works.
 142          */
 143         while((err = uml_net_rx(dev)) > 0) ;
 144
 145         spin_lock(&opened_lock);
 146         list_add(&lp->list, &opened);
 147         spin_unlock(&opened_lock);
 148
 149         return 0;
 150 out_close:
 151         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 152         lp->fd = -1;
 153 out:
 154         return err;
 155 }
 156
 157 static int uml_net_close(struct net_device *dev)
 158 {
 159         struct uml_net_private *lp = dev->priv;
 160
 161         netif_stop_queue(dev);
 162
 163         free_irq(dev->irq, dev);
 164         if(lp->close != NULL)
 165                 (*lp->close)(lp->fd, &lp->user);
 166         lp->fd = -1;
 167
 168         spin_lock(&opened_lock);
 169         list_del(&lp->list);
 170         spin_unlock(&opened_lock);
 171
 172         return 0;
 173 }
 174
 175 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 176 {
 177         struct uml_net_private *lp = dev->priv;
 178         unsigned long flags;
 179         int len;
 180
 181         netif_stop_queue(dev);
 182
 183         spin_lock_irqsave(&lp->lock, flags);
 184
 185         len = (*lp->write)(lp->fd, &skb, lp);
 186
 187         if(len == skb->len) {
 188                 lp->stats.tx_packets++;
 189                 lp->stats.tx_bytes += skb->len;
 190                 dev->trans_start = jiffies;
 191                 netif_start_queue(dev);
 192
 193                 /* this is normally done in the interrupt when tx finishes */
 194                 netif_wake_queue(dev);
 195         }
 196         else if(len == 0){
 197                 netif_start_queue(dev);
 198                 lp->stats.tx_dropped++;
 199         }
 200         else {
 201                 netif_start_queue(dev);
 202                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 203         }
 204
 205         spin_unlock_irqrestore(&lp->lock, flags);
 206
 207         dev_kfree_skb(skb);
 208
 209         return 0;
 210 }
 211
 212 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 213 {
 214         struct uml_net_private *lp = dev->priv;
 215         return &lp->stats;
 216 }
 217
 218 static void uml_net_set_multicast_list(struct net_device *dev)
 219 {
 220         if (dev->flags & IFF_PROMISC) return;
 221         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 222         else dev->flags &= ~IFF_ALLMULTI;
 223 }
 224
 225 static void uml_net_tx_timeout(struct net_device *dev)
 226 {
 227         dev->trans_start = jiffies;
 228         netif_wake_queue(dev);
 229 }
 230
 231 static int uml_net_set_mac(struct net_device *dev, void *addr)
 232 {
 233         struct uml_net_private *lp = dev->priv;
 234         struct sockaddr *hwaddr = addr;
 235
 236         spin_lock_irq(&lp->lock);
 237         set_ether_mac(dev, hwaddr->sa_data);
 238         spin_unlock_irq(&lp->lock);
 239
 240         return(0);
 241 }
 242
 243 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 244 {
 245         struct uml_net_private *lp = dev->priv;
 246         int err = 0;
 247
 248         spin_lock_irq(&lp->lock);
 249
 250         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 251         if(new_mtu < 0){
 252                 err = new_mtu;
 253                 goto out;
 254         }
 255
 256         dev->mtu = new_mtu;
 257
 258  out:
 259         spin_unlock_irq(&lp->lock);
 260         return err;
 261 }
 262
 263 static void uml_net_get_drvinfo(struct net_device *dev,
 264                                 struct ethtool_drvinfo *info)
 265 {
 266         strcpy(info->driver, DRIVER_NAME);
 267         strcpy(info->version, "42");
 268 }
 269
 270 static struct ethtool_ops uml_net_ethtool_ops = {
 271         .get_drvinfo    = uml_net_get_drvinfo,
 272         .get_link       = ethtool_op_get_link,
 273 };
 274
 275 void uml_net_user_timer_expire(unsigned long _conn)
 276 {
 277 #ifdef undef
 278         struct connection *conn = (struct connection *)_conn;
 279
 280         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 281         do_connect(conn);
 282 #endif
 283 }
 284
 285 static void setup_etheraddr(char *str, unsigned char *addr)
 286 {
 287         char *end;
 288         int i;
 289
 290         if(str == NULL)
 291                 goto random;
 292
 293         for(i=0;i<6;i++){
 294                 addr[i] = simple_strtoul(str, &end, 16);
 295                 if((end == str) ||
 296                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 297                         printk(KERN_ERR
 298                                "setup_etheraddr: failed to parse '%s' "
 299                                "as an ethernet address\n", str);
 300                         goto random;
 301                 }
 302                 str = end + 1;
 303         }
 304         if(addr[0] & 1){
 305                 printk(KERN_ERR
 306                        "Attempt to assign a broadcast ethernet address to a "
 307                        "device disallowed\n");
 308                 goto random;
 309         }
 310         return;
 311
 312 random:
 313         random_ether_addr(addr);
 314 }
 315
 316 static DEFINE_SPINLOCK(devices_lock);
 317 static LIST_HEAD(devices);
 318
 319 static struct platform_driver uml_net_driver = {
 320         .driver = {
 321                 .name  = DRIVER_NAME,
 322         },
 323 };
 324 static int driver_registered;
 325
 326 static int eth_configure(int n, void *init, char *mac,
 327                          struct transport *transport)
 328 {
 329         struct uml_net *device;
 330         struct net_device *dev;
 331         struct uml_net_private *lp;
 332         int save, err, size;
 333
 334         size = transport->private_size + sizeof(struct uml_net_private) +
 335                 sizeof(((struct uml_net_private *) 0)->user);
 336
 337         device = kmalloc(sizeof(*device), GFP_KERNEL);
 338         if (device == NULL) {
 339                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 340                 return(1);
 341         }
 342
 343         memset(device, 0, sizeof(*device));
 344         INIT_LIST_HEAD(&device->list);
 345         device->index = n;
 346
 347         spin_lock(&devices_lock);
 348         list_add(&device->list, &devices);
 349         spin_unlock(&devices_lock);
 350
 351         setup_etheraddr(mac, device->mac);
 352
 353         printk(KERN_INFO "Netdevice %d ", n);
 354         printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 355                device->mac[0], device->mac[1],
 356                device->mac[2], device->mac[3],
 357                device->mac[4], device->mac[5]);
 358         printk(": ");
 359         dev = alloc_etherdev(size);
 360         if (dev == NULL) {
 361                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 362                 return 1;
 363         }
 364
 365         lp = dev->priv;
 366         /* This points to the transport private data. It's still clear, but we
 367          * must memset it to 0 *now*. Let's help the drivers. */
 368         memset(lp, 0, size);
 369
 370         /* sysfs register */
 371         if (!driver_registered) {
 372                 platform_driver_register(&uml_net_driver);
 373                 driver_registered = 1;
 374         }
 375         device->pdev.id = n;
 376         device->pdev.name = DRIVER_NAME;
 377         platform_device_register(&device->pdev);
 378         SET_NETDEV_DEV(dev,&device->pdev.dev);
 379
 380         /* If this name ends up conflicting with an existing registered
 381          * netdevice, that is OK, register_netdev{,ice}() will notice this
 382          * and fail.
 383          */
 384         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 385         device->dev = dev;
 386
 387         (*transport->kern->init)(dev, init);
 388
 389         dev->mtu = transport->user->max_packet;
 390         dev->open = uml_net_open;
 391         dev->hard_start_xmit = uml_net_start_xmit;
 392         dev->stop = uml_net_close;
 393         dev->get_stats = uml_net_get_stats;
 394         dev->set_multicast_list = uml_net_set_multicast_list;
 395         dev->tx_timeout = uml_net_tx_timeout;
 396         dev->set_mac_address = uml_net_set_mac;
 397         dev->change_mtu = uml_net_change_mtu;
 398         dev->ethtool_ops = &uml_net_ethtool_ops;
 399         dev->watchdog_timeo = (HZ >> 1);
 400         dev->irq = UM_ETH_IRQ;
 401
 402         rtnl_lock();
 403         err = register_netdevice(dev);
 404         rtnl_unlock();
 405         if (err) {
 406                 device->dev = NULL;
 407                 /* XXX: should we call ->remove() here? */
 408                 free_netdev(dev);
 409                 return 1;
 410         }
 411
 412         /* lp.user is the first four bytes of the transport data, which
 413          * has already been initialized.  This structure assignment will
 414          * overwrite that, so we make sure that .user gets overwritten with
 415          * what it already has.
 416          */
 417         save = lp->user[0];
 418         *lp = ((struct uml_net_private)
 419                 { .list                 = LIST_HEAD_INIT(lp->list),
 420                   .dev                  = dev,
 421                   .fd                   = -1,
 422                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 423                   .protocol             = transport->kern->protocol,
 424                   .open                 = transport->user->open,
 425                   .close                = transport->user->close,
 426                   .remove               = transport->user->remove,
 427                   .read                 = transport->kern->read,
 428                   .write                = transport->kern->write,
 429                   .add_address          = transport->user->add_address,
 430                   .delete_address       = transport->user->delete_address,
 431                   .set_mtu              = transport->user->set_mtu,
 432                   .user                 = { save } });
 433
 434         init_timer(&lp->tl);
 435         spin_lock_init(&lp->lock);
 436         lp->tl.function = uml_net_user_timer_expire;
 437         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 438
 439         if (transport->user->init)
 440                 (*transport->user->init)(&lp->user, dev);
 441
 442         set_ether_mac(dev, device->mac);
 443
 444         return 0;
 445 }
 446
 447 static struct uml_net *find_device(int n)
 448 {
 449         struct uml_net *device;
 450         struct list_head *ele;
 451
 452         spin_lock(&devices_lock);
 453         list_for_each(ele, &devices){
 454                 device = list_entry(ele, struct uml_net, list);
 455                 if(device->index == n)
 456                         goto out;
 457         }
 458         device = NULL;
 459  out:
 460         spin_unlock(&devices_lock);
 461         return(device);
 462 }
 463
 464 static int eth_parse(char *str, int *index_out, char **str_out)
 465 {
 466         char *end;
 467         int n;
 468
 469         n = simple_strtoul(str, &end, 0);
 470         if(end == str){
 471                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 472                 return(1);
 473         }
 474         if(n < 0){
 475                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 476                 return(1);
 477         }
 478         str = end;
 479         if(*str != '='){
 480                 printk(KERN_ERR
 481                        "eth_setup: expected '=' after device number\n");
 482                 return(1);
 483         }
 484         str++;
 485         if(find_device(n)){
 486                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 487                        n);
 488                 return(1);
 489         }
 490         if(index_out) *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 /* Filled in at boot time.  Will need locking if the transports become
 502  * modular.
 503  */
 504 struct list_head transports = LIST_HEAD_INIT(transports);
 505
 506 /* Filled in during early boot */
 507 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 508
 509 static int check_transport(struct transport *transport, char *eth, int n,
 510                            void **init_out, char **mac_out)
 511 {
 512         int len;
 513
 514         len = strlen(transport->name);
 515         if(strncmp(eth, transport->name, len))
 516                 return(0);
 517
 518         eth += len;
 519         if(*eth == ',')
 520                 eth++;
 521         else if(*eth != '\0')
 522                 return(0);
 523
 524         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 525         if(*init_out == NULL)
 526                 return(1);
 527
 528         if(!transport->setup(eth, mac_out, *init_out)){
 529                 kfree(*init_out);
 530                 *init_out = NULL;
 531         }
 532         return(1);
 533 }
 534
 535 void register_transport(struct transport *new)
 536 {
 537         struct list_head *ele, *next;
 538         struct eth_init *eth;
 539         void *init;
 540         char *mac = NULL;
 541         int match;
 542
 543         list_add(&new->list, &transports);
 544
 545         list_for_each_safe(ele, next, &eth_cmd_line){
 546                 eth = list_entry(ele, struct eth_init, list);
 547                 match = check_transport(new, eth->init, eth->index, &init,
 548                                         &mac);
 549                 if(!match)
 550                         continue;
 551                 else if(init != NULL){
 552                         eth_configure(eth->index, init, mac, new);
 553                         kfree(init);
 554                 }
 555                 list_del(&eth->list);
 556         }
 557 }
 558
 559 static int eth_setup_common(char *str, int index)
 560 {
 561         struct list_head *ele;
 562         struct transport *transport;
 563         void *init;
 564         char *mac = NULL;
 565
 566         list_for_each(ele, &transports){
 567                 transport = list_entry(ele, struct transport, list);
 568                 if(!check_transport(transport, str, index, &init, &mac))
 569                         continue;
 570                 if(init != NULL){
 571                         eth_configure(index, init, mac, transport);
 572                         kfree(init);
 573                 }
 574                 return(1);
 575         }
 576         return(0);
 577 }
 578
 579 static int eth_setup(char *str)
 580 {
 581         struct eth_init *new;
 582         int n, err;
 583
 584         err = eth_parse(str, &n, &str);
 585         if(err)
 586                 return 1;
 587
 588         new = alloc_bootmem(sizeof(*new));
 589         if (new == NULL){
 590                 printk("eth_init : alloc_bootmem failed\n");
 591                 return 1;
 592         }
 593
 594         INIT_LIST_HEAD(&new->list);
 595         new->index = n;
 596         new->init = str;
 597
 598         list_add_tail(&new->list, &eth_cmd_line);
 599         return 1;
 600 }
 601
 602 __setup("eth", eth_setup);
 603 __uml_help(eth_setup,
 604 "eth[0-9]+=<transport>,<options>\n"
 605 "    Configure a network device.\n\n"
 606 );
 607
 608 #if 0
 609 static int eth_init(void)
 610 {
 611         struct list_head *ele, *next;
 612         struct eth_init *eth;
 613
 614         list_for_each_safe(ele, next, &eth_cmd_line){
 615                 eth = list_entry(ele, struct eth_init, list);
 616
 617                 if(eth_setup_common(eth->init, eth->index))
 618                         list_del(&eth->list);
 619         }
 620
 621         return(1);
 622 }
 623 __initcall(eth_init);
 624 #endif
 625
 626 static int net_config(char *str)
 627 {
 628         int n, err;
 629
 630         err = eth_parse(str, &n, &str);
 631         if(err) return(err);
 632
 633         str = kstrdup(str, GFP_KERNEL);
 634         if(str == NULL){
 635                 printk(KERN_ERR "net_config failed to strdup string\n");
 636                 return(-1);
 637         }
 638         err = !eth_setup_common(str, n);
 639         if(err)
 640                 kfree(str);
 641         return(err);
 642 }
 643
 644 static int net_id(char **str, int *start_out, int *end_out)
 645 {
 646         char *end;
 647         int n;
 648
 649         n = simple_strtoul(*str, &end, 0);
 650         if((*end != '\0') || (end == *str))
 651                 return -1;
 652
 653         *start_out = n;
 654         *end_out = n;
 655         *str = end;
 656         return n;
 657 }
 658
 659 static int net_remove(int n)
 660 {
 661         struct uml_net *device;
 662         struct net_device *dev;
 663         struct uml_net_private *lp;
 664
 665         device = find_device(n);
 666         if(device == NULL)
 667                 return -ENODEV;
 668
 669         dev = device->dev;
 670         lp = dev->priv;
 671         if(lp->fd > 0)
 672                 return -EBUSY;
 673         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 674         unregister_netdev(dev);
 675         platform_device_unregister(&device->pdev);
 676
 677         list_del(&device->list);
 678         kfree(device);
 679         free_netdev(dev);
 680         return 0;
 681 }
 682
 683 static struct mc_device net_mc = {
 684         .name           = "eth",
 685         .config         = net_config,
 686         .get_config     = NULL,
 687         .id             = net_id,
 688         .remove         = net_remove,
 689 };
 690
 691 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 692                               void *ptr)
 693 {
 694         struct in_ifaddr *ifa = ptr;
 695         struct net_device *dev = ifa->ifa_dev->dev;
 696         struct uml_net_private *lp;
 697         void (*proc)(unsigned char *, unsigned char *, void *);
 698         unsigned char addr_buf[4], netmask_buf[4];
 699
 700         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 701
 702         lp = dev->priv;
 703
 704         proc = NULL;
 705         switch (event){
 706         case NETDEV_UP:
 707                 proc = lp->add_address;
 708                 break;
 709         case NETDEV_DOWN:
 710                 proc = lp->delete_address;
 711                 break;
 712         }
 713         if(proc != NULL){
 714                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 715                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 716                 (*proc)(addr_buf, netmask_buf, &lp->user);
 717         }
 718         return(NOTIFY_DONE);
 719 }
 720
 721 struct notifier_block uml_inetaddr_notifier = {
 722         .notifier_call          = uml_inetaddr_event,
 723 };
 724
 725 static int uml_net_init(void)
 726 {
 727         struct list_head *ele;
 728         struct uml_net_private *lp;
 729         struct in_device *ip;
 730         struct in_ifaddr *in;
 731
 732         mconsole_register_dev(&net_mc);
 733         register_inetaddr_notifier(&uml_inetaddr_notifier);
 734
 735         /* Devices may have been opened already, so the uml_inetaddr_notifier
 736          * didn't get a chance to run for them.  This fakes it so that
 737          * addresses which have already been set up get handled properly.
 738          */
 739         list_for_each(ele, &opened){
 740                 lp = list_entry(ele, struct uml_net_private, list);
 741                 ip = lp->dev->ip_ptr;
 742                 if(ip == NULL) continue;
 743                 in = ip->ifa_list;
 744                 while(in != NULL){
 745                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 746                         in = in->ifa_next;
 747                 }
 748         }
 749
 750         return(0);
 751 }
 752
 753 __initcall(uml_net_init);
 754
 755 static void close_devices(void)
 756 {
 757         struct list_head *ele;
 758         struct uml_net_private *lp;
 759
 760         list_for_each(ele, &opened){
 761                 lp = list_entry(ele, struct uml_net_private, list);
 762                 free_irq(lp->dev->irq, lp->dev);
 763                 if((lp->close != NULL) && (lp->fd >= 0))
 764                         (*lp->close)(lp->fd, &lp->user);
 765                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 766         }
 767 }
 768
 769 __uml_exitcall(close_devices);
 770
 771 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 772 {
 773         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 774                 struct sk_buff *skb2;
 775
 776                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 777                 dev_kfree_skb(skb);
 778                 skb = skb2;
 779         }
 780         if(skb != NULL) skb_put(skb, extra);
 781         return(skb);
 782 }
 783
 784 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 785                                         void *),
 786                     void *arg)
 787 {
 788         struct net_device *dev = d;
 789         struct in_device *ip = dev->ip_ptr;
 790         struct in_ifaddr *in;
 791         unsigned char address[4], netmask[4];
 792
 793         if(ip == NULL) return;
 794         in = ip->ifa_list;
 795         while(in != NULL){
 796                 memcpy(address, &in->ifa_address, sizeof(address));
 797                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 798                 (*cb)(address, netmask, arg);
 799                 in = in->ifa_next;
 800         }
 801 }
 802
 803 int dev_netmask(void *d, void *m)
 804 {
 805         struct net_device *dev = d;
 806         struct in_device *ip = dev->ip_ptr;
 807         struct in_ifaddr *in;
 808         __be32 *mask_out = m;
 809
 810         if(ip == NULL)
 811                 return(1);
 812
 813         in = ip->ifa_list;
 814         if(in == NULL)
 815                 return(1);
 816
 817         *mask_out = in->ifa_mask;
 818         return(0);
 819 }
 820
 821 void *get_output_buffer(int *len_out)
 822 {
 823         void *ret;
 824
 825         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 826         if(ret) *len_out = PAGE_SIZE;
 827         else *len_out = 0;
 828         return(ret);
 829 }
 830
 831 void free_output_buffer(void *buffer)
 832 {
 833         free_pages((unsigned long) buffer, 0);
 834 }
 835
 836 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 837                      char **gate_addr)
 838 {
 839         char *remain;
 840
 841         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 842         if(remain != NULL){
 843                 printk("tap_setup_common - Extra garbage on specification : "
 844                        "'%s'\n", remain);
 845                 return(1);
 846         }
 847
 848         return(0);
 849 }
 850
 851 unsigned short eth_protocol(struct sk_buff *skb)
 852 {
 853         return(eth_type_trans(skb, skb->dev));
 854 }
 855
 856 /*
 857  * Overrides for Emacs so that we follow Linus's tabbing style.
 858  * Emacs will notice this stuff at the end of the file and automatically
 859  * adjust the settings for this buffer only.  This must remain at the end
 860  * of the file.
 861  * ---------------------------------------------------------------------------
 862  * Local variables:
 863  * c-file-style: "linux"
 864  * End:
 865  */