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 /*
  38  * The drop_skb is used when we can't allocate an skb.  The
  39  * packet is read into drop_skb in order to get the data off the
  40  * connection to the host.
  41  * It is reallocated whenever a maximum packet size is seen which is
  42  * larger than any seen before.  update_drop_skb is called from
  43  * eth_configure when a new interface is added.
  44  */
  45 static DEFINE_SPINLOCK(drop_lock);
  46 static struct sk_buff *drop_skb;
  47 static int drop_max;
  48
  49 static int update_drop_skb(int max)
  50 {
  51         struct sk_buff *new;
  52         unsigned long flags;
  53         int err = 0;
  54
  55         spin_lock_irqsave(&drop_lock, flags);
  56
  57         if (max <= drop_max)
  58                 goto out;
  59
  60         err = -ENOMEM;
  61         new = dev_alloc_skb(max);
  62         if (new == NULL)
  63                 goto out;
  64
  65         skb_put(new, max);
  66
  67         kfree_skb(drop_skb);
  68         drop_skb = new;
  69         drop_max = max;
  70         err = 0;
  71 out:
  72         spin_unlock_irqrestore(&drop_lock, flags);
  73
  74         return err;
  75 }
  76
  77 static int uml_net_rx(struct net_device *dev)
  78 {
  79         struct uml_net_private *lp = netdev_priv(dev);
  80         int pkt_len;
  81         struct sk_buff *skb;
  82
  83         /* If we can't allocate memory, try again next round. */
  84         skb = dev_alloc_skb(lp->max_packet);
  85         if (skb == NULL) {
  86                 drop_skb->dev = dev;
  87                 /* Read a packet into drop_skb and don't do anything with it. */
  88                 (*lp->read)(lp->fd, drop_skb, lp);
  89                 lp->stats.rx_dropped++;
  90                 return 0;
  91         }
  92
  93         skb->dev = dev;
  94         skb_put(skb, lp->max_packet);
  95         skb_reset_mac_header(skb);
  96         pkt_len = (*lp->read)(lp->fd, skb, lp);
  97
  98         if (pkt_len > 0) {
  99                 skb_trim(skb, pkt_len);
 100                 skb->protocol = (*lp->protocol)(skb);
 101
 102                 lp->stats.rx_bytes += skb->len;
 103                 lp->stats.rx_packets++;
 104                 netif_rx(skb);
 105                 return pkt_len;
 106         }
 107
 108         kfree_skb(skb);
 109         return pkt_len;
 110 }
 111
 112 static void uml_dev_close(struct work_struct *work)
 113 {
 114         struct uml_net_private *lp =
 115                 container_of(work, struct uml_net_private, work);
 116         dev_close(lp->dev);
 117 }
 118
 119 static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
 120 {
 121         struct net_device *dev = dev_id;
 122         struct uml_net_private *lp = netdev_priv(dev);
 123         int err;
 124
 125         if (!netif_running(dev))
 126                 return IRQ_NONE;
 127
 128         spin_lock(&lp->lock);
 129         while ((err = uml_net_rx(dev)) > 0) ;
 130         if (err < 0) {
 131                 printk(KERN_ERR
 132                        "Device '%s' read returned %d, shutting it down\n",
 133                        dev->name, err);
 134                 /* dev_close can't be called in interrupt context, and takes
 135                  * again lp->lock.
 136                  * And dev_close() can be safely called multiple times on the
 137                  * same device, since it tests for (dev->flags & IFF_UP). So
 138                  * there's no harm in delaying the device shutdown.
 139                  * Furthermore, the workqueue will not re-enqueue an already
 140                  * enqueued work item. */
 141                 schedule_work(&lp->work);
 142                 goto out;
 143         }
 144         reactivate_fd(lp->fd, UM_ETH_IRQ);
 145
 146 out:
 147         spin_unlock(&lp->lock);
 148         return IRQ_HANDLED;
 149 }
 150
 151 static int uml_net_open(struct net_device *dev)
 152 {
 153         struct uml_net_private *lp = netdev_priv(dev);
 154         int err;
 155
 156         if (lp->fd >= 0) {
 157                 err = -ENXIO;
 158                 goto out;
 159         }
 160
 161         lp->fd = (*lp->open)(&lp->user);
 162         if (lp->fd < 0) {
 163                 err = lp->fd;
 164                 goto out;
 165         }
 166
 167         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 168                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
 169         if (err != 0) {
 170                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 171                 err = -ENETUNREACH;
 172                 goto out_close;
 173         }
 174
 175         lp->tl.data = (unsigned long) &lp->user;
 176         netif_start_queue(dev);
 177
 178         /* clear buffer - it can happen that the host side of the interface
 179          * is full when we get here.  In this case, new data is never queued,
 180          * SIGIOs never arrive, and the net never works.
 181          */
 182         while ((err = uml_net_rx(dev)) > 0) ;
 183
 184         spin_lock(&opened_lock);
 185         list_add(&lp->list, &opened);
 186         spin_unlock(&opened_lock);
 187
 188         return 0;
 189 out_close:
 190         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 191         lp->fd = -1;
 192 out:
 193         return err;
 194 }
 195
 196 static int uml_net_close(struct net_device *dev)
 197 {
 198         struct uml_net_private *lp = netdev_priv(dev);
 199
 200         netif_stop_queue(dev);
 201
 202         free_irq(dev->irq, dev);
 203         if (lp->close != NULL)
 204                 (*lp->close)(lp->fd, &lp->user);
 205         lp->fd = -1;
 206
 207         spin_lock(&opened_lock);
 208         list_del(&lp->list);
 209         spin_unlock(&opened_lock);
 210
 211         return 0;
 212 }
 213
 214 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 215 {
 216         struct uml_net_private *lp = netdev_priv(dev);
 217         unsigned long flags;
 218         int len;
 219
 220         netif_stop_queue(dev);
 221
 222         spin_lock_irqsave(&lp->lock, flags);
 223
 224         len = (*lp->write)(lp->fd, skb, lp);
 225
 226         if (len == skb->len) {
 227                 lp->stats.tx_packets++;
 228                 lp->stats.tx_bytes += skb->len;
 229                 dev->trans_start = jiffies;
 230                 netif_start_queue(dev);
 231
 232                 /* this is normally done in the interrupt when tx finishes */
 233                 netif_wake_queue(dev);
 234         }
 235         else if (len == 0) {
 236                 netif_start_queue(dev);
 237                 lp->stats.tx_dropped++;
 238         }
 239         else {
 240                 netif_start_queue(dev);
 241                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 242         }
 243
 244         spin_unlock_irqrestore(&lp->lock, flags);
 245
 246         dev_kfree_skb(skb);
 247
 248         return 0;
 249 }
 250
 251 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 252 {
 253         struct uml_net_private *lp = netdev_priv(dev);
 254         return &lp->stats;
 255 }
 256
 257 static void uml_net_set_multicast_list(struct net_device *dev)
 258 {
 259         return;
 260 }
 261
 262 static void uml_net_tx_timeout(struct net_device *dev)
 263 {
 264         dev->trans_start = jiffies;
 265         netif_wake_queue(dev);
 266 }
 267
 268 static int uml_net_set_mac(struct net_device *dev, void *addr)
 269 {
 270         struct uml_net_private *lp = netdev_priv(dev);
 271         struct sockaddr *hwaddr = addr;
 272
 273         spin_lock_irq(&lp->lock);
 274         set_ether_mac(dev, hwaddr->sa_data);
 275         spin_unlock_irq(&lp->lock);
 276
 277         return 0;
 278 }
 279
 280 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 281 {
 282         dev->mtu = new_mtu;
 283
 284         return 0;
 285 }
 286
 287 static void uml_net_get_drvinfo(struct net_device *dev,
 288                                 struct ethtool_drvinfo *info)
 289 {
 290         strcpy(info->driver, DRIVER_NAME);
 291         strcpy(info->version, "42");
 292 }
 293
 294 static struct ethtool_ops uml_net_ethtool_ops = {
 295         .get_drvinfo    = uml_net_get_drvinfo,
 296         .get_link       = ethtool_op_get_link,
 297 };
 298
 299 static void uml_net_user_timer_expire(unsigned long _conn)
 300 {
 301 #ifdef undef
 302         struct connection *conn = (struct connection *)_conn;
 303
 304         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 305         do_connect(conn);
 306 #endif
 307 }
 308
 309 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
 310 {
 311         char *end;
 312         int i;
 313
 314         if (str == NULL)
 315                 goto random;
 316
 317         for (i = 0; i < 6; i++) {
 318                 addr[i] = simple_strtoul(str, &end, 16);
 319                 if ((end == str) ||
 320                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 321                         printk(KERN_ERR
 322                                "setup_etheraddr: failed to parse '%s' "
 323                                "as an ethernet address\n", str);
 324                         goto random;
 325                 }
 326                 str = end + 1;
 327         }
 328         if (is_multicast_ether_addr(addr)) {
 329                 printk(KERN_ERR
 330                        "Attempt to assign a multicast ethernet address to a "
 331                        "device disallowed\n");
 332                 goto random;
 333         }
 334         if (!is_valid_ether_addr(addr)) {
 335                 printk(KERN_ERR
 336                        "Attempt to assign an invalid ethernet address to a "
 337                        "device disallowed\n");
 338                 goto random;
 339         }
 340         if (!is_local_ether_addr(addr)) {
 341                 printk(KERN_WARNING
 342                        "Warning: Assigning a globally valid ethernet "
 343                        "address to a device\n");
 344                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 345                        "the first byte of the MAC,\n");
 346                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 347                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 348                        addr[5]);
 349         }
 350         return;
 351
 352 random:
 353         printk(KERN_INFO
 354                "Choosing a random ethernet address for device %s\n", name);
 355         random_ether_addr(addr);
 356 }
 357
 358 static DEFINE_SPINLOCK(devices_lock);
 359 static LIST_HEAD(devices);
 360
 361 static struct platform_driver uml_net_driver = {
 362         .driver = {
 363                 .name  = DRIVER_NAME,
 364         },
 365 };
 366
 367 static void net_device_release(struct device *dev)
 368 {
 369         struct uml_net *device = dev->driver_data;
 370         struct net_device *netdev = device->dev;
 371         struct uml_net_private *lp = netdev_priv(netdev);
 372
 373         if (lp->remove != NULL)
 374                 (*lp->remove)(&lp->user);
 375         list_del(&device->list);
 376         kfree(device);
 377         free_netdev(netdev);
 378 }
 379
 380 /*
 381  * Ensures that platform_driver_register is called only once by
 382  * eth_configure.  Will be set in an initcall.
 383  */
 384 static int driver_registered;
 385
 386 static void eth_configure(int n, void *init, char *mac,
 387                           struct transport *transport)
 388 {
 389         struct uml_net *device;
 390         struct net_device *dev;
 391         struct uml_net_private *lp;
 392         int err, size;
 393
 394         size = transport->private_size + sizeof(struct uml_net_private);
 395
 396         device = kzalloc(sizeof(*device), GFP_KERNEL);
 397         if (device == NULL) {
 398                 printk(KERN_ERR "eth_configure failed to allocate struct "
 399                        "uml_net\n");
 400                 return;
 401         }
 402
 403         dev = alloc_etherdev(size);
 404         if (dev == NULL) {
 405                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 406                        "net_device for eth%d\n", n);
 407                 goto out_free_device;
 408         }
 409
 410         INIT_LIST_HEAD(&device->list);
 411         device->index = n;
 412
 413         /* If this name ends up conflicting with an existing registered
 414          * netdevice, that is OK, register_netdev{,ice}() will notice this
 415          * and fail.
 416          */
 417         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 418
 419         setup_etheraddr(mac, device->mac, dev->name);
 420
 421         printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac);
 422
 423         lp = netdev_priv(dev);
 424         /* This points to the transport private data. It's still clear, but we
 425          * must memset it to 0 *now*. Let's help the drivers. */
 426         memset(lp, 0, size);
 427         INIT_WORK(&lp->work, uml_dev_close);
 428
 429         /* sysfs register */
 430         if (!driver_registered) {
 431                 platform_driver_register(&uml_net_driver);
 432                 driver_registered = 1;
 433         }
 434         device->pdev.id = n;
 435         device->pdev.name = DRIVER_NAME;
 436         device->pdev.dev.release = net_device_release;
 437         device->pdev.dev.driver_data = device;
 438         if (platform_device_register(&device->pdev))
 439                 goto out_free_netdev;
 440         SET_NETDEV_DEV(dev,&device->pdev.dev);
 441
 442         device->dev = dev;
 443
 444         /*
 445          * These just fill in a data structure, so there's no failure
 446          * to be worried about.
 447          */
 448         (*transport->kern->init)(dev, init);
 449
 450         *lp = ((struct uml_net_private)
 451                 { .list                 = LIST_HEAD_INIT(lp->list),
 452                   .dev                  = dev,
 453                   .fd                   = -1,
 454                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 455                   .max_packet           = transport->user->max_packet,
 456                   .protocol             = transport->kern->protocol,
 457                   .open                 = transport->user->open,
 458                   .close                = transport->user->close,
 459                   .remove               = transport->user->remove,
 460                   .read                 = transport->kern->read,
 461                   .write                = transport->kern->write,
 462                   .add_address          = transport->user->add_address,
 463                   .delete_address       = transport->user->delete_address });
 464
 465         init_timer(&lp->tl);
 466         spin_lock_init(&lp->lock);
 467         lp->tl.function = uml_net_user_timer_expire;
 468         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 469
 470         if ((transport->user->init != NULL) &&
 471             ((*transport->user->init)(&lp->user, dev) != 0))
 472                 goto out_unregister;
 473
 474         set_ether_mac(dev, device->mac);
 475         dev->mtu = transport->user->mtu;
 476         dev->open = uml_net_open;
 477         dev->hard_start_xmit = uml_net_start_xmit;
 478         dev->stop = uml_net_close;
 479         dev->get_stats = uml_net_get_stats;
 480         dev->set_multicast_list = uml_net_set_multicast_list;
 481         dev->tx_timeout = uml_net_tx_timeout;
 482         dev->set_mac_address = uml_net_set_mac;
 483         dev->change_mtu = uml_net_change_mtu;
 484         dev->ethtool_ops = &uml_net_ethtool_ops;
 485         dev->watchdog_timeo = (HZ >> 1);
 486         dev->irq = UM_ETH_IRQ;
 487
 488         err = update_drop_skb(lp->max_packet);
 489         if (err)
 490                 goto out_undo_user_init;
 491
 492         rtnl_lock();
 493         err = register_netdevice(dev);
 494         rtnl_unlock();
 495         if (err)
 496                 goto out_undo_user_init;
 497
 498         spin_lock(&devices_lock);
 499         list_add(&device->list, &devices);
 500         spin_unlock(&devices_lock);
 501
 502         return;
 503
 504 out_undo_user_init:
 505         if (transport->user->remove != NULL)
 506                 (*transport->user->remove)(&lp->user);
 507 out_unregister:
 508         platform_device_unregister(&device->pdev);
 509         return; /* platform_device_unregister frees dev and device */
 510 out_free_netdev:
 511         free_netdev(dev);
 512 out_free_device:
 513         kfree(device);
 514 }
 515
 516 static struct uml_net *find_device(int n)
 517 {
 518         struct uml_net *device;
 519         struct list_head *ele;
 520
 521         spin_lock(&devices_lock);
 522         list_for_each(ele, &devices) {
 523                 device = list_entry(ele, struct uml_net, list);
 524                 if (device->index == n)
 525                         goto out;
 526         }
 527         device = NULL;
 528  out:
 529         spin_unlock(&devices_lock);
 530         return device;
 531 }
 532
 533 static int eth_parse(char *str, int *index_out, char **str_out,
 534                      char **error_out)
 535 {
 536         char *end;
 537         int n, err = -EINVAL;;
 538
 539         n = simple_strtoul(str, &end, 0);
 540         if (end == str) {
 541                 *error_out = "Bad device number";
 542                 return err;
 543         }
 544
 545         str = end;
 546         if (*str != '=') {
 547                 *error_out = "Expected '=' after device number";
 548                 return err;
 549         }
 550
 551         str++;
 552         if (find_device(n)) {
 553                 *error_out = "Device already configured";
 554                 return err;
 555         }
 556
 557         *index_out = n;
 558         *str_out = str;
 559         return 0;
 560 }
 561
 562 struct eth_init {
 563         struct list_head list;
 564         char *init;
 565         int index;
 566 };
 567
 568 static DEFINE_SPINLOCK(transports_lock);
 569 static LIST_HEAD(transports);
 570
 571 /* Filled in during early boot */
 572 static LIST_HEAD(eth_cmd_line);
 573
 574 static int check_transport(struct transport *transport, char *eth, int n,
 575                            void **init_out, char **mac_out)
 576 {
 577         int len;
 578
 579         len = strlen(transport->name);
 580         if (strncmp(eth, transport->name, len))
 581                 return 0;
 582
 583         eth += len;
 584         if (*eth == ',')
 585                 eth++;
 586         else if (*eth != '\0')
 587                 return 0;
 588
 589         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 590         if (*init_out == NULL)
 591                 return 1;
 592
 593         if (!transport->setup(eth, mac_out, *init_out)) {
 594                 kfree(*init_out);
 595                 *init_out = NULL;
 596         }
 597         return 1;
 598 }
 599
 600 void register_transport(struct transport *new)
 601 {
 602         struct list_head *ele, *next;
 603         struct eth_init *eth;
 604         void *init;
 605         char *mac = NULL;
 606         int match;
 607
 608         spin_lock(&transports_lock);
 609         BUG_ON(!list_empty(&new->list));
 610         list_add(&new->list, &transports);
 611         spin_unlock(&transports_lock);
 612
 613         list_for_each_safe(ele, next, &eth_cmd_line) {
 614                 eth = list_entry(ele, struct eth_init, list);
 615                 match = check_transport(new, eth->init, eth->index, &init,
 616                                         &mac);
 617                 if (!match)
 618                         continue;
 619                 else if (init != NULL) {
 620                         eth_configure(eth->index, init, mac, new);
 621                         kfree(init);
 622                 }
 623                 list_del(&eth->list);
 624         }
 625 }
 626
 627 static int eth_setup_common(char *str, int index)
 628 {
 629         struct list_head *ele;
 630         struct transport *transport;
 631         void *init;
 632         char *mac = NULL;
 633         int found = 0;
 634
 635         spin_lock(&transports_lock);
 636         list_for_each(ele, &transports) {
 637                 transport = list_entry(ele, struct transport, list);
 638                 if (!check_transport(transport, str, index, &init, &mac))
 639                         continue;
 640                 if (init != NULL) {
 641                         eth_configure(index, init, mac, transport);
 642                         kfree(init);
 643                 }
 644                 found = 1;
 645                 break;
 646         }
 647
 648         spin_unlock(&transports_lock);
 649         return found;
 650 }
 651
 652 static int __init eth_setup(char *str)
 653 {
 654         struct eth_init *new;
 655         char *error;
 656         int n, err;
 657
 658         err = eth_parse(str, &n, &str, &error);
 659         if (err) {
 660                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 661                        str, error);
 662                 return 1;
 663         }
 664
 665         new = alloc_bootmem(sizeof(*new));
 666         if (new == NULL) {
 667                 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
 668                 return 1;
 669         }
 670
 671         INIT_LIST_HEAD(&new->list);
 672         new->index = n;
 673         new->init = str;
 674
 675         list_add_tail(&new->list, &eth_cmd_line);
 676         return 1;
 677 }
 678
 679 __setup("eth", eth_setup);
 680 __uml_help(eth_setup,
 681 "eth[0-9]+=<transport>,<options>\n"
 682 "    Configure a network device.\n\n"
 683 );
 684
 685 static int net_config(char *str, char **error_out)
 686 {
 687         int n, err;
 688
 689         err = eth_parse(str, &n, &str, error_out);
 690         if (err)
 691                 return err;
 692
 693         /* This string is broken up and the pieces used by the underlying
 694          * driver.  So, it is freed only if eth_setup_common fails.
 695          */
 696         str = kstrdup(str, GFP_KERNEL);
 697         if (str == NULL) {
 698                 *error_out = "net_config failed to strdup string";
 699                 return -ENOMEM;
 700         }
 701         err = !eth_setup_common(str, n);
 702         if (err)
 703                 kfree(str);
 704         return err;
 705 }
 706
 707 static int net_id(char **str, int *start_out, int *end_out)
 708 {
 709         char *end;
 710         int n;
 711
 712         n = simple_strtoul(*str, &end, 0);
 713         if ((*end != '\0') || (end == *str))
 714                 return -1;
 715
 716         *start_out = n;
 717         *end_out = n;
 718         *str = end;
 719         return n;
 720 }
 721
 722 static int net_remove(int n, char **error_out)
 723 {
 724         struct uml_net *device;
 725         struct net_device *dev;
 726         struct uml_net_private *lp;
 727
 728         device = find_device(n);
 729         if (device == NULL)
 730                 return -ENODEV;
 731
 732         dev = device->dev;
 733         lp = netdev_priv(dev);
 734         if (lp->fd > 0)
 735                 return -EBUSY;
 736         unregister_netdev(dev);
 737         platform_device_unregister(&device->pdev);
 738
 739         return 0;
 740 }
 741
 742 static struct mc_device net_mc = {
 743         .list           = LIST_HEAD_INIT(net_mc.list),
 744         .name           = "eth",
 745         .config         = net_config,
 746         .get_config     = NULL,
 747         .id             = net_id,
 748         .remove         = net_remove,
 749 };
 750
 751 #ifdef CONFIG_INET
 752 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 753                               void *ptr)
 754 {
 755         struct in_ifaddr *ifa = ptr;
 756         struct net_device *dev = ifa->ifa_dev->dev;
 757         struct uml_net_private *lp;
 758         void (*proc)(unsigned char *, unsigned char *, void *);
 759         unsigned char addr_buf[4], netmask_buf[4];
 760
 761         if (dev->open != uml_net_open)
 762                 return NOTIFY_DONE;
 763
 764         lp = netdev_priv(dev);
 765
 766         proc = NULL;
 767         switch (event) {
 768         case NETDEV_UP:
 769                 proc = lp->add_address;
 770                 break;
 771         case NETDEV_DOWN:
 772                 proc = lp->delete_address;
 773                 break;
 774         }
 775         if (proc != NULL) {
 776                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 777                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 778                 (*proc)(addr_buf, netmask_buf, &lp->user);
 779         }
 780         return NOTIFY_DONE;
 781 }
 782
 783 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 784 static struct notifier_block uml_inetaddr_notifier = {
 785         .notifier_call          = uml_inetaddr_event,
 786 };
 787
 788 static void inet_register(void)
 789 {
 790         struct list_head *ele;
 791         struct uml_net_private *lp;
 792         struct in_device *ip;
 793         struct in_ifaddr *in;
 794
 795         register_inetaddr_notifier(&uml_inetaddr_notifier);
 796
 797         /* Devices may have been opened already, so the uml_inetaddr_notifier
 798          * didn't get a chance to run for them.  This fakes it so that
 799          * addresses which have already been set up get handled properly.
 800          */
 801         spin_lock(&opened_lock);
 802         list_for_each(ele, &opened) {
 803                 lp = list_entry(ele, struct uml_net_private, list);
 804                 ip = lp->dev->ip_ptr;
 805                 if (ip == NULL)
 806                         continue;
 807                 in = ip->ifa_list;
 808                 while (in != NULL) {
 809                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 810                         in = in->ifa_next;
 811                 }
 812         }
 813         spin_unlock(&opened_lock);
 814 }
 815 #else
 816 static inline void inet_register(void)
 817 {
 818 }
 819 #endif
 820
 821 static int uml_net_init(void)
 822 {
 823         mconsole_register_dev(&net_mc);
 824         inet_register();
 825         return 0;
 826 }
 827
 828 __initcall(uml_net_init);
 829
 830 static void close_devices(void)
 831 {
 832         struct list_head *ele;
 833         struct uml_net_private *lp;
 834
 835         spin_lock(&opened_lock);
 836         list_for_each(ele, &opened) {
 837                 lp = list_entry(ele, struct uml_net_private, list);
 838                 free_irq(lp->dev->irq, lp->dev);
 839                 if ((lp->close != NULL) && (lp->fd >= 0))
 840                         (*lp->close)(lp->fd, &lp->user);
 841                 if (lp->remove != NULL)
 842                         (*lp->remove)(&lp->user);
 843         }
 844         spin_unlock(&opened_lock);
 845 }
 846
 847 __uml_exitcall(close_devices);
 848
 849 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 850                                         void *),
 851                     void *arg)
 852 {
 853         struct net_device *dev = d;
 854         struct in_device *ip = dev->ip_ptr;
 855         struct in_ifaddr *in;
 856         unsigned char address[4], netmask[4];
 857
 858         if (ip == NULL) return;
 859         in = ip->ifa_list;
 860         while (in != NULL) {
 861                 memcpy(address, &in->ifa_address, sizeof(address));
 862                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 863                 (*cb)(address, netmask, arg);
 864                 in = in->ifa_next;
 865         }
 866 }
 867
 868 int dev_netmask(void *d, void *m)
 869 {
 870         struct net_device *dev = d;
 871         struct in_device *ip = dev->ip_ptr;
 872         struct in_ifaddr *in;
 873         __be32 *mask_out = m;
 874
 875         if (ip == NULL)
 876                 return 1;
 877
 878         in = ip->ifa_list;
 879         if (in == NULL)
 880                 return 1;
 881
 882         *mask_out = in->ifa_mask;
 883         return 0;
 884 }
 885
 886 void *get_output_buffer(int *len_out)
 887 {
 888         void *ret;
 889
 890         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 891         if (ret) *len_out = PAGE_SIZE;
 892         else *len_out = 0;
 893         return ret;
 894 }
 895
 896 void free_output_buffer(void *buffer)
 897 {
 898         free_pages((unsigned long) buffer, 0);
 899 }
 900
 901 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 902                      char **gate_addr)
 903 {
 904         char *remain;
 905
 906         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 907         if (remain != NULL) {
 908                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 909                        "specification : '%s'\n", remain);
 910                 return 1;
 911         }
 912
 913         return 0;
 914 }
 915
 916 unsigned short eth_protocol(struct sk_buff *skb)
 917 {
 918         return eth_type_trans(skb, skb->dev);
 919 }