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