SAFE public projects git trees. - safe/jmp/linux-2.6/blob - arch/um/drivers/net_kern.c

   1 /*
   2  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   4  * James Leu (jleu@mindspring.net).
   5  * Copyright (C) 2001 by various other people who didn't put their name here.
   6  * Licensed under the GPL.
   7  */
   8
   9 #include <linux/bootmem.h>
  10 #include <linux/etherdevice.h>
  11 #include <linux/ethtool.h>
  12 #include <linux/inetdevice.h>
  13 #include <linux/init.h>
  14 #include <linux/list.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/spinlock.h>
  20 #include "init.h"
  21 #include "irq_kern.h"
  22 #include "irq_user.h"
  23 #include "mconsole_kern.h"
  24 #include "net_kern.h"
  25 #include "net_user.h"
  26
  27 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
  28 {
  29         memcpy(dev->dev_addr, addr, ETH_ALEN);
  30 }
  31
  32 #define DRIVER_NAME "uml-netdev"
  33
  34 static DEFINE_SPINLOCK(opened_lock);
  35 static LIST_HEAD(opened);
  36
  37 static int uml_net_rx(struct net_device *dev)
  38 {
  39         struct uml_net_private *lp = dev->priv;
  40         int pkt_len;
  41         struct sk_buff *skb;
  42
  43         /* If we can't allocate memory, try again next round. */
  44         skb = dev_alloc_skb(lp->max_packet);
  45         if (skb == NULL) {
  46                 lp->stats.rx_dropped++;
  47                 return 0;
  48         }
  49
  50         skb->dev = dev;
  51         skb_put(skb, lp->max_packet);
  52         skb_reset_mac_header(skb);
  53         pkt_len = (*lp->read)(lp->fd, skb, lp);
  54
  55         if (pkt_len > 0) {
  56                 skb_trim(skb, pkt_len);
  57                 skb->protocol = (*lp->protocol)(skb);
  58                 netif_rx(skb);
  59
  60                 lp->stats.rx_bytes += skb->len;
  61                 lp->stats.rx_packets++;
  62                 return pkt_len;
  63         }
  64
  65         kfree_skb(skb);
  66         return pkt_len;
  67 }
  68
  69 static void uml_dev_close(struct work_struct *work)
  70 {
  71         struct uml_net_private *lp =
  72                 container_of(work, struct uml_net_private, work);
  73         dev_close(lp->dev);
  74 }
  75
  76 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
  77 {
  78         struct net_device *dev = dev_id;
  79         struct uml_net_private *lp = dev->priv;
  80         int err;
  81
  82         if (!netif_running(dev))
  83                 return IRQ_NONE;
  84
  85         spin_lock(&lp->lock);
  86         while ((err = uml_net_rx(dev)) > 0) ;
  87         if (err < 0) {
  88                 printk(KERN_ERR
  89                        "Device '%s' read returned %d, shutting it down\n",
  90                        dev->name, err);
  91                 /* dev_close can't be called in interrupt context, and takes
  92                  * again lp->lock.
  93                  * And dev_close() can be safely called multiple times on the
  94                  * same device, since it tests for (dev->flags & IFF_UP). So
  95                  * there's no harm in delaying the device shutdown.
  96                  * Furthermore, the workqueue will not re-enqueue an already
  97                  * enqueued work item. */
  98                 schedule_work(&lp->work);
  99                 goto out;
 100         }
 101         reactivate_fd(lp->fd, UM_ETH_IRQ);
 102
 103 out:
 104         spin_unlock(&lp->lock);
 105         return IRQ_HANDLED;
 106 }
 107
 108 static int uml_net_open(struct net_device *dev)
 109 {
 110         struct uml_net_private *lp = dev->priv;
 111         int err;
 112
 113         if (lp->fd >= 0) {
 114                 err = -ENXIO;
 115                 goto out;
 116         }
 117
 118         lp->fd = (*lp->open)(&lp->user);
 119         if (lp->fd < 0) {
 120                 err = lp->fd;
 121                 goto out;
 122         }
 123
 124         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 125                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
 126         if (err != 0) {
 127                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 128                 err = -ENETUNREACH;
 129                 goto out_close;
 130         }
 131
 132         lp->tl.data = (unsigned long) &lp->user;
 133         netif_start_queue(dev);
 134
 135         /* clear buffer - it can happen that the host side of the interface
 136          * is full when we get here.  In this case, new data is never queued,
 137          * SIGIOs never arrive, and the net never works.
 138          */
 139         while ((err = uml_net_rx(dev)) > 0) ;
 140
 141         spin_lock(&opened_lock);
 142         list_add(&lp->list, &opened);
 143         spin_unlock(&opened_lock);
 144
 145         return 0;
 146 out_close:
 147         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 148         lp->fd = -1;
 149 out:
 150         return err;
 151 }
 152
 153 static int uml_net_close(struct net_device *dev)
 154 {
 155         struct uml_net_private *lp = dev->priv;
 156
 157         netif_stop_queue(dev);
 158
 159         free_irq(dev->irq, dev);
 160         if (lp->close != NULL)
 161                 (*lp->close)(lp->fd, &lp->user);
 162         lp->fd = -1;
 163
 164         spin_lock(&opened_lock);
 165         list_del(&lp->list);
 166         spin_unlock(&opened_lock);
 167
 168         return 0;
 169 }
 170
 171 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 172 {
 173         struct uml_net_private *lp = dev->priv;
 174         unsigned long flags;
 175         int len;
 176
 177         netif_stop_queue(dev);
 178
 179         spin_lock_irqsave(&lp->lock, flags);
 180
 181         len = (*lp->write)(lp->fd, skb, lp);
 182
 183         if (len == skb->len) {
 184                 lp->stats.tx_packets++;
 185                 lp->stats.tx_bytes += skb->len;
 186                 dev->trans_start = jiffies;
 187                 netif_start_queue(dev);
 188
 189                 /* this is normally done in the interrupt when tx finishes */
 190                 netif_wake_queue(dev);
 191         }
 192         else if (len == 0) {
 193                 netif_start_queue(dev);
 194                 lp->stats.tx_dropped++;
 195         }
 196         else {
 197                 netif_start_queue(dev);
 198                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 199         }
 200
 201         spin_unlock_irqrestore(&lp->lock, flags);
 202
 203         dev_kfree_skb(skb);
 204
 205         return 0;
 206 }
 207
 208 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 209 {
 210         struct uml_net_private *lp = dev->priv;
 211         return &lp->stats;
 212 }
 213
 214 static void uml_net_set_multicast_list(struct net_device *dev)
 215 {
 216         if (dev->flags & IFF_PROMISC)
 217                 return;
 218         else if (dev->mc_count)
 219                 dev->flags |= IFF_ALLMULTI;
 220         else dev->flags &= ~IFF_ALLMULTI;
 221 }
 222
 223 static void uml_net_tx_timeout(struct net_device *dev)
 224 {
 225         dev->trans_start = jiffies;
 226         netif_wake_queue(dev);
 227 }
 228
 229 static int uml_net_set_mac(struct net_device *dev, void *addr)
 230 {
 231         struct uml_net_private *lp = dev->priv;
 232         struct sockaddr *hwaddr = addr;
 233
 234         spin_lock_irq(&lp->lock);
 235         set_ether_mac(dev, hwaddr->sa_data);
 236         spin_unlock_irq(&lp->lock);
 237
 238         return 0;
 239 }
 240
 241 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 242 {
 243         dev->mtu = new_mtu;
 244
 245         return 0;
 246 }
 247
 248 static void uml_net_get_drvinfo(struct net_device *dev,
 249                                 struct ethtool_drvinfo *info)
 250 {
 251         strcpy(info->driver, DRIVER_NAME);
 252         strcpy(info->version, "42");
 253 }
 254
 255 static struct ethtool_ops uml_net_ethtool_ops = {
 256         .get_drvinfo    = uml_net_get_drvinfo,
 257         .get_link       = ethtool_op_get_link,
 258 };
 259
 260 void uml_net_user_timer_expire(unsigned long _conn)
 261 {
 262 #ifdef undef
 263         struct connection *conn = (struct connection *)_conn;
 264
 265         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 266         do_connect(conn);
 267 #endif
 268 }
 269
 270 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
 271 {
 272         char *end;
 273         int i;
 274
 275         if (str == NULL)
 276                 goto random;
 277
 278         for (i = 0;i < 6; i++) {
 279                 addr[i] = simple_strtoul(str, &end, 16);
 280                 if ((end == str) ||
 281                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 282                         printk(KERN_ERR
 283                                "setup_etheraddr: failed to parse '%s' "
 284                                "as an ethernet address\n", str);
 285                         goto random;
 286                 }
 287                 str = end + 1;
 288         }
 289         if (is_multicast_ether_addr(addr)) {
 290                 printk(KERN_ERR
 291                        "Attempt to assign a multicast ethernet address to a "
 292                        "device disallowed\n");
 293                 goto random;
 294         }
 295         if (!is_valid_ether_addr(addr)) {
 296                 printk(KERN_ERR
 297                        "Attempt to assign an invalid ethernet address to a "
 298                        "device disallowed\n");
 299                 goto random;
 300         }
 301         if (!is_local_ether_addr(addr)) {
 302                 printk(KERN_WARNING
 303                        "Warning: attempt to assign a globally valid ethernet "
 304                        "address to a device\n");
 305                 printk(KERN_WARNING "You should better enable the 2nd "
 306                        "rightmost bit in the first byte of the MAC,\n");
 307                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 308                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 309                        addr[5]);
 310                 goto random;
 311         }
 312         return;
 313
 314 random:
 315         printk(KERN_INFO
 316                "Choosing a random ethernet address for device %s\n", name);
 317         random_ether_addr(addr);
 318 }
 319
 320 static DEFINE_SPINLOCK(devices_lock);
 321 static LIST_HEAD(devices);
 322
 323 static struct platform_driver uml_net_driver = {
 324         .driver = {
 325                 .name  = DRIVER_NAME,
 326         },
 327 };
 328 static int driver_registered;
 329
 330 static void net_device_release(struct device *dev)
 331 {
 332         struct uml_net *device = dev->driver_data;
 333         struct net_device *netdev = device->dev;
 334         struct uml_net_private *lp = netdev->priv;
 335
 336         if (lp->remove != NULL)
 337                 (*lp->remove)(&lp->user);
 338         list_del(&device->list);
 339         kfree(device);
 340         free_netdev(netdev);
 341 }
 342
 343 static void eth_configure(int n, void *init, char *mac,
 344                           struct transport *transport)
 345 {
 346         struct uml_net *device;
 347         struct net_device *dev;
 348         struct uml_net_private *lp;
 349         int err, size;
 350
 351         size = transport->private_size + sizeof(struct uml_net_private);
 352
 353         device = kzalloc(sizeof(*device), GFP_KERNEL);
 354         if (device == NULL) {
 355                 printk(KERN_ERR "eth_configure failed to allocate struct "
 356                        "uml_net\n");
 357                 return;
 358         }
 359
 360         dev = alloc_etherdev(size);
 361         if (dev == NULL) {
 362                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 363                        "net_device for eth%d\n", n);
 364                 goto out_free_device;
 365         }
 366
 367         INIT_LIST_HEAD(&device->list);
 368         device->index = n;
 369
 370         /* If this name ends up conflicting with an existing registered
 371          * netdevice, that is OK, register_netdev{,ice}() will notice this
 372          * and fail.
 373          */
 374         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 375
 376         setup_etheraddr(mac, device->mac, dev->name);
 377
 378         printk(KERN_INFO "Netdevice %d ", n);
 379         printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 380                device->mac[0], device->mac[1],
 381                device->mac[2], device->mac[3],
 382                device->mac[4], device->mac[5]);
 383         printk(": ");
 384
 385         lp = dev->priv;
 386         /* This points to the transport private data. It's still clear, but we
 387          * must memset it to 0 *now*. Let's help the drivers. */
 388         memset(lp, 0, size);
 389         INIT_WORK(&lp->work, uml_dev_close);
 390
 391         /* sysfs register */
 392         if (!driver_registered) {
 393                 platform_driver_register(&uml_net_driver);
 394                 driver_registered = 1;
 395         }
 396         device->pdev.id = n;
 397         device->pdev.name = DRIVER_NAME;
 398         device->pdev.dev.release = net_device_release;
 399         device->pdev.dev.driver_data = device;
 400         if (platform_device_register(&device->pdev))
 401                 goto out_free_netdev;
 402         SET_NETDEV_DEV(dev,&device->pdev.dev);
 403
 404         device->dev = dev;
 405
 406         /*
 407          * These just fill in a data structure, so there's no failure
 408          * to be worried about.
 409          */
 410         (*transport->kern->init)(dev, init);
 411
 412         *lp = ((struct uml_net_private)
 413                 { .list                 = LIST_HEAD_INIT(lp->list),
 414                   .dev                  = dev,
 415                   .fd                   = -1,
 416                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 417                   .max_packet           = transport->user->max_packet,
 418                   .protocol             = transport->kern->protocol,
 419                   .open                 = transport->user->open,
 420                   .close                = transport->user->close,
 421                   .remove               = transport->user->remove,
 422                   .read                 = transport->kern->read,
 423                   .write                = transport->kern->write,
 424                   .add_address          = transport->user->add_address,
 425                   .delete_address       = transport->user->delete_address });
 426
 427         init_timer(&lp->tl);
 428         spin_lock_init(&lp->lock);
 429         lp->tl.function = uml_net_user_timer_expire;
 430         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 431
 432         if ((transport->user->init != NULL) &&
 433             ((*transport->user->init)(&lp->user, dev) != 0))
 434                 goto out_unregister;
 435
 436         set_ether_mac(dev, device->mac);
 437         dev->mtu = transport->user->mtu;
 438         dev->open = uml_net_open;
 439         dev->hard_start_xmit = uml_net_start_xmit;
 440         dev->stop = uml_net_close;
 441         dev->get_stats = uml_net_get_stats;
 442         dev->set_multicast_list = uml_net_set_multicast_list;
 443         dev->tx_timeout = uml_net_tx_timeout;
 444         dev->set_mac_address = uml_net_set_mac;
 445         dev->change_mtu = uml_net_change_mtu;
 446         dev->ethtool_ops = &uml_net_ethtool_ops;
 447         dev->watchdog_timeo = (HZ >> 1);
 448         dev->irq = UM_ETH_IRQ;
 449
 450         rtnl_lock();
 451         err = register_netdevice(dev);
 452         rtnl_unlock();
 453         if (err)
 454                 goto out_undo_user_init;
 455
 456         spin_lock(&devices_lock);
 457         list_add(&device->list, &devices);
 458         spin_unlock(&devices_lock);
 459
 460         return;
 461
 462 out_undo_user_init:
 463         if (transport->user->remove != NULL)
 464                 (*transport->user->remove)(&lp->user);
 465 out_unregister:
 466         platform_device_unregister(&device->pdev);
 467         return; /* platform_device_unregister frees dev and device */
 468 out_free_netdev:
 469         free_netdev(dev);
 470 out_free_device:
 471         kfree(device);
 472 }
 473
 474 static struct uml_net *find_device(int n)
 475 {
 476         struct uml_net *device;
 477         struct list_head *ele;
 478
 479         spin_lock(&devices_lock);
 480         list_for_each(ele, &devices) {
 481                 device = list_entry(ele, struct uml_net, list);
 482                 if (device->index == n)
 483                         goto out;
 484         }
 485         device = NULL;
 486  out:
 487         spin_unlock(&devices_lock);
 488         return device;
 489 }
 490
 491 static int eth_parse(char *str, int *index_out, char **str_out,
 492                      char **error_out)
 493 {
 494         char *end;
 495         int n, err = -EINVAL;;
 496
 497         n = simple_strtoul(str, &end, 0);
 498         if (end == str) {
 499                 *error_out = "Bad device number";
 500                 return err;
 501         }
 502
 503         str = end;
 504         if (*str != '=') {
 505                 *error_out = "Expected '=' after device number";
 506                 return err;
 507         }
 508
 509         str++;
 510         if (find_device(n)) {
 511                 *error_out = "Device already configured";
 512                 return err;
 513         }
 514
 515         *index_out = n;
 516         *str_out = str;
 517         return 0;
 518 }
 519
 520 struct eth_init {
 521         struct list_head list;
 522         char *init;
 523         int index;
 524 };
 525
 526 static DEFINE_SPINLOCK(transports_lock);
 527 static LIST_HEAD(transports);
 528
 529 /* Filled in during early boot */
 530 static LIST_HEAD(eth_cmd_line);
 531
 532 static int check_transport(struct transport *transport, char *eth, int n,
 533                            void **init_out, char **mac_out)
 534 {
 535         int len;
 536
 537         len = strlen(transport->name);
 538         if (strncmp(eth, transport->name, len))
 539                 return 0;
 540
 541         eth += len;
 542         if (*eth == ',')
 543                 eth++;
 544         else if (*eth != '\0')
 545                 return 0;
 546
 547         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 548         if (*init_out == NULL)
 549                 return 1;
 550
 551         if (!transport->setup(eth, mac_out, *init_out)) {
 552                 kfree(*init_out);
 553                 *init_out = NULL;
 554         }
 555         return 1;
 556 }
 557
 558 void register_transport(struct transport *new)
 559 {
 560         struct list_head *ele, *next;
 561         struct eth_init *eth;
 562         void *init;
 563         char *mac = NULL;
 564         int match;
 565
 566         spin_lock(&transports_lock);
 567         BUG_ON(!list_empty(&new->list));
 568         list_add(&new->list, &transports);
 569         spin_unlock(&transports_lock);
 570
 571         list_for_each_safe(ele, next, &eth_cmd_line) {
 572                 eth = list_entry(ele, struct eth_init, list);
 573                 match = check_transport(new, eth->init, eth->index, &init,
 574                                         &mac);
 575                 if (!match)
 576                         continue;
 577                 else if (init != NULL) {
 578                         eth_configure(eth->index, init, mac, new);
 579                         kfree(init);
 580                 }
 581                 list_del(&eth->list);
 582         }
 583 }
 584
 585 static int eth_setup_common(char *str, int index)
 586 {
 587         struct list_head *ele;
 588         struct transport *transport;
 589         void *init;
 590         char *mac = NULL;
 591         int found = 0;
 592
 593         spin_lock(&transports_lock);
 594         list_for_each(ele, &transports) {
 595                 transport = list_entry(ele, struct transport, list);
 596                 if (!check_transport(transport, str, index, &init, &mac))
 597                         continue;
 598                 if (init != NULL) {
 599                         eth_configure(index, init, mac, transport);
 600                         kfree(init);
 601                 }
 602                 found = 1;
 603                 break;
 604         }
 605
 606         spin_unlock(&transports_lock);
 607         return found;
 608 }
 609
 610 static int __init eth_setup(char *str)
 611 {
 612         struct eth_init *new;
 613         char *error;
 614         int n, err;
 615
 616         err = eth_parse(str, &n, &str, &error);
 617         if (err) {
 618                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 619                        str, error);
 620                 return 1;
 621         }
 622
 623         new = alloc_bootmem(sizeof(*new));
 624         if (new == NULL) {
 625                 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
 626                 return 1;
 627         }
 628
 629         INIT_LIST_HEAD(&new->list);
 630         new->index = n;
 631         new->init = str;
 632
 633         list_add_tail(&new->list, &eth_cmd_line);
 634         return 1;
 635 }
 636
 637 __setup("eth", eth_setup);
 638 __uml_help(eth_setup,
 639 "eth[0-9]+=<transport>,<options>\n"
 640 "    Configure a network device.\n\n"
 641 );
 642
 643 static int net_config(char *str, char **error_out)
 644 {
 645         int n, err;
 646
 647         err = eth_parse(str, &n, &str, error_out);
 648         if (err)
 649                 return err;
 650
 651         /* This string is broken up and the pieces used by the underlying
 652          * driver.  So, it is freed only if eth_setup_common fails.
 653          */
 654         str = kstrdup(str, GFP_KERNEL);
 655         if (str == NULL) {
 656                 *error_out = "net_config failed to strdup string";
 657                 return -ENOMEM;
 658         }
 659         err = !eth_setup_common(str, n);
 660         if (err)
 661                 kfree(str);
 662         return err;
 663 }
 664
 665 static int net_id(char **str, int *start_out, int *end_out)
 666 {
 667         char *end;
 668         int n;
 669
 670         n = simple_strtoul(*str, &end, 0);
 671         if ((*end != '\0') || (end == *str))
 672                 return -1;
 673
 674         *start_out = n;
 675         *end_out = n;
 676         *str = end;
 677         return n;
 678 }
 679
 680 static int net_remove(int n, char **error_out)
 681 {
 682         struct uml_net *device;
 683         struct net_device *dev;
 684         struct uml_net_private *lp;
 685
 686         device = find_device(n);
 687         if (device == NULL)
 688                 return -ENODEV;
 689
 690         dev = device->dev;
 691         lp = dev->priv;
 692         if (lp->fd > 0)
 693                 return -EBUSY;
 694         unregister_netdev(dev);
 695         platform_device_unregister(&device->pdev);
 696
 697         return 0;
 698 }
 699
 700 static struct mc_device net_mc = {
 701         .list           = LIST_HEAD_INIT(net_mc.list),
 702         .name           = "eth",
 703         .config         = net_config,
 704         .get_config     = NULL,
 705         .id             = net_id,
 706         .remove         = net_remove,
 707 };
 708
 709 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 710                               void *ptr)
 711 {
 712         struct in_ifaddr *ifa = ptr;
 713         struct net_device *dev = ifa->ifa_dev->dev;
 714         struct uml_net_private *lp;
 715         void (*proc)(unsigned char *, unsigned char *, void *);
 716         unsigned char addr_buf[4], netmask_buf[4];
 717
 718         if (dev->open != uml_net_open)
 719                 return NOTIFY_DONE;
 720
 721         lp = dev->priv;
 722
 723         proc = NULL;
 724         switch (event) {
 725         case NETDEV_UP:
 726                 proc = lp->add_address;
 727                 break;
 728         case NETDEV_DOWN:
 729                 proc = lp->delete_address;
 730                 break;
 731         }
 732         if (proc != NULL) {
 733                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 734                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 735                 (*proc)(addr_buf, netmask_buf, &lp->user);
 736         }
 737         return NOTIFY_DONE;
 738 }
 739
 740 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 741 struct notifier_block uml_inetaddr_notifier = {
 742         .notifier_call          = uml_inetaddr_event,
 743 };
 744
 745 static int uml_net_init(void)
 746 {
 747         struct list_head *ele;
 748         struct uml_net_private *lp;
 749         struct in_device *ip;
 750         struct in_ifaddr *in;
 751
 752         mconsole_register_dev(&net_mc);
 753         register_inetaddr_notifier(&uml_inetaddr_notifier);
 754
 755         /* Devices may have been opened already, so the uml_inetaddr_notifier
 756          * didn't get a chance to run for them.  This fakes it so that
 757          * addresses which have already been set up get handled properly.
 758          */
 759         spin_lock(&opened_lock);
 760         list_for_each(ele, &opened) {
 761                 lp = list_entry(ele, struct uml_net_private, list);
 762                 ip = lp->dev->ip_ptr;
 763                 if (ip == NULL)
 764                         continue;
 765                 in = ip->ifa_list;
 766                 while (in != NULL) {
 767                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 768                         in = in->ifa_next;
 769                 }
 770         }
 771         spin_unlock(&opened_lock);
 772
 773         return 0;
 774 }
 775
 776 __initcall(uml_net_init);
 777
 778 static void close_devices(void)
 779 {
 780         struct list_head *ele;
 781         struct uml_net_private *lp;
 782
 783         spin_lock(&opened_lock);
 784         list_for_each(ele, &opened) {
 785                 lp = list_entry(ele, struct uml_net_private, list);
 786                 free_irq(lp->dev->irq, lp->dev);
 787                 if ((lp->close != NULL) && (lp->fd >= 0))
 788                         (*lp->close)(lp->fd, &lp->user);
 789                 if (lp->remove != NULL)
 790                         (*lp->remove)(&lp->user);
 791         }
 792         spin_unlock(&opened_lock);
 793 }
 794
 795 __uml_exitcall(close_devices);
 796
 797 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 798                                         void *),
 799                     void *arg)
 800 {
 801         struct net_device *dev = d;
 802         struct in_device *ip = dev->ip_ptr;
 803         struct in_ifaddr *in;
 804         unsigned char address[4], netmask[4];
 805
 806         if (ip == NULL) return;
 807         in = ip->ifa_list;
 808         while (in != NULL) {
 809                 memcpy(address, &in->ifa_address, sizeof(address));
 810                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 811                 (*cb)(address, netmask, arg);
 812                 in = in->ifa_next;
 813         }
 814 }
 815
 816 int dev_netmask(void *d, void *m)
 817 {
 818         struct net_device *dev = d;
 819         struct in_device *ip = dev->ip_ptr;
 820         struct in_ifaddr *in;
 821         __be32 *mask_out = m;
 822
 823         if (ip == NULL)
 824                 return 1;
 825
 826         in = ip->ifa_list;
 827         if (in == NULL)
 828                 return 1;
 829
 830         *mask_out = in->ifa_mask;
 831         return 0;
 832 }
 833
 834 void *get_output_buffer(int *len_out)
 835 {
 836         void *ret;
 837
 838         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 839         if (ret) *len_out = PAGE_SIZE;
 840         else *len_out = 0;
 841         return ret;
 842 }
 843
 844 void free_output_buffer(void *buffer)
 845 {
 846         free_pages((unsigned long) buffer, 0);
 847 }
 848
 849 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 850                      char **gate_addr)
 851 {
 852         char *remain;
 853
 854         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 855         if (remain != NULL) {
 856                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 857                        "specification : '%s'\n", remain);
 858                 return 1;
 859         }
 860
 861         return 0;
 862 }
 863
 864 unsigned short eth_protocol(struct sk_buff *skb)
 865 {
 866         return eth_type_trans(skb, skb->dev);
 867 }