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 ([email protected]) and
   4  * James Leu ([email protected]).
   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/slab.h>
  20 #include <linux/spinlock.h>
  21 #include "init.h"
  22 #include "irq_kern.h"
  23 #include "irq_user.h"
  24 #include "mconsole_kern.h"
  25 #include "net_kern.h"
  26 #include "net_user.h"
  27
  28 #define DRIVER_NAME "uml-netdev"
  29
  30 static DEFINE_SPINLOCK(opened_lock);
  31 static LIST_HEAD(opened);
  32
  33 /*
  34  * The drop_skb is used when we can't allocate an skb.  The
  35  * packet is read into drop_skb in order to get the data off the
  36  * connection to the host.
  37  * It is reallocated whenever a maximum packet size is seen which is
  38  * larger than any seen before.  update_drop_skb is called from
  39  * eth_configure when a new interface is added.
  40  */
  41 static DEFINE_SPINLOCK(drop_lock);
  42 static struct sk_buff *drop_skb;
  43 static int drop_max;
  44
  45 static int update_drop_skb(int max)
  46 {
  47         struct sk_buff *new;
  48         unsigned long flags;
  49         int err = 0;
  50
  51         spin_lock_irqsave(&drop_lock, flags);
  52
  53         if (max <= drop_max)
  54                 goto out;
  55
  56         err = -ENOMEM;
  57         new = dev_alloc_skb(max);
  58         if (new == NULL)
  59                 goto out;
  60
  61         skb_put(new, max);
  62
  63         kfree_skb(drop_skb);
  64         drop_skb = new;
  65         drop_max = max;
  66         err = 0;
  67 out:
  68         spin_unlock_irqrestore(&drop_lock, flags);
  69
  70         return err;
  71 }
  72
  73 static int uml_net_rx(struct net_device *dev)
  74 {
  75         struct uml_net_private *lp = netdev_priv(dev);
  76         int pkt_len;
  77         struct sk_buff *skb;
  78
  79         /* If we can't allocate memory, try again next round. */
  80         skb = dev_alloc_skb(lp->max_packet);
  81         if (skb == NULL) {
  82                 drop_skb->dev = dev;
  83                 /* Read a packet into drop_skb and don't do anything with it. */
  84                 (*lp->read)(lp->fd, drop_skb, lp);
  85                 dev->stats.rx_dropped++;
  86                 return 0;
  87         }
  88
  89         skb->dev = dev;
  90         skb_put(skb, lp->max_packet);
  91         skb_reset_mac_header(skb);
  92         pkt_len = (*lp->read)(lp->fd, skb, lp);
  93
  94         if (pkt_len > 0) {
  95                 skb_trim(skb, pkt_len);
  96                 skb->protocol = (*lp->protocol)(skb);
  97
  98                 dev->stats.rx_bytes += skb->len;
  99                 dev->stats.rx_packets++;
 100                 netif_rx(skb);
 101                 return pkt_len;
 102         }
 103
 104         kfree_skb(skb);
 105         return pkt_len;
 106 }
 107
 108 static void uml_dev_close(struct work_struct *work)
 109 {
 110         struct uml_net_private *lp =
 111                 container_of(work, struct uml_net_private, work);
 112         dev_close(lp->dev);
 113 }
 114
 115 static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
 116 {
 117         struct net_device *dev = dev_id;
 118         struct uml_net_private *lp = netdev_priv(dev);
 119         int err;
 120
 121         if (!netif_running(dev))
 122                 return IRQ_NONE;
 123
 124         spin_lock(&lp->lock);
 125         while ((err = uml_net_rx(dev)) > 0) ;
 126         if (err < 0) {
 127                 printk(KERN_ERR
 128                        "Device '%s' read returned %d, shutting it down\n",
 129                        dev->name, err);
 130                 /* dev_close can't be called in interrupt context, and takes
 131                  * again lp->lock.
 132                  * And dev_close() can be safely called multiple times on the
 133                  * same device, since it tests for (dev->flags & IFF_UP). So
 134                  * there's no harm in delaying the device shutdown.
 135                  * Furthermore, the workqueue will not re-enqueue an already
 136                  * enqueued work item. */
 137                 schedule_work(&lp->work);
 138                 goto out;
 139         }
 140         reactivate_fd(lp->fd, UM_ETH_IRQ);
 141
 142 out:
 143         spin_unlock(&lp->lock);
 144         return IRQ_HANDLED;
 145 }
 146
 147 static int uml_net_open(struct net_device *dev)
 148 {
 149         struct uml_net_private *lp = netdev_priv(dev);
 150         int err;
 151
 152         if (lp->fd >= 0) {
 153                 err = -ENXIO;
 154                 goto out;
 155         }
 156
 157         lp->fd = (*lp->open)(&lp->user);
 158         if (lp->fd < 0) {
 159                 err = lp->fd;
 160                 goto out;
 161         }
 162
 163         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 164                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
 165         if (err != 0) {
 166                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 167                 err = -ENETUNREACH;
 168                 goto out_close;
 169         }
 170
 171         lp->tl.data = (unsigned long) &lp->user;
 172         netif_start_queue(dev);
 173
 174         /* clear buffer - it can happen that the host side of the interface
 175          * is full when we get here.  In this case, new data is never queued,
 176          * SIGIOs never arrive, and the net never works.
 177          */
 178         while ((err = uml_net_rx(dev)) > 0) ;
 179
 180         spin_lock(&opened_lock);
 181         list_add(&lp->list, &opened);
 182         spin_unlock(&opened_lock);
 183
 184         return 0;
 185 out_close:
 186         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 187         lp->fd = -1;
 188 out:
 189         return err;
 190 }
 191
 192 static int uml_net_close(struct net_device *dev)
 193 {
 194         struct uml_net_private *lp = netdev_priv(dev);
 195
 196         netif_stop_queue(dev);
 197
 198         free_irq(dev->irq, dev);
 199         if (lp->close != NULL)
 200                 (*lp->close)(lp->fd, &lp->user);
 201         lp->fd = -1;
 202
 203         spin_lock(&opened_lock);
 204         list_del(&lp->list);
 205         spin_unlock(&opened_lock);
 206
 207         return 0;
 208 }
 209
 210 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 211 {
 212         struct uml_net_private *lp = netdev_priv(dev);
 213         unsigned long flags;
 214         int len;
 215
 216         netif_stop_queue(dev);
 217
 218         spin_lock_irqsave(&lp->lock, flags);
 219
 220         len = (*lp->write)(lp->fd, skb, lp);
 221
 222         if (len == skb->len) {
 223                 dev->stats.tx_packets++;
 224                 dev->stats.tx_bytes += skb->len;
 225                 dev->trans_start = jiffies;
 226                 netif_start_queue(dev);
 227
 228                 /* this is normally done in the interrupt when tx finishes */
 229                 netif_wake_queue(dev);
 230         }
 231         else if (len == 0) {
 232                 netif_start_queue(dev);
 233                 dev->stats.tx_dropped++;
 234         }
 235         else {
 236                 netif_start_queue(dev);
 237                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 238         }
 239
 240         spin_unlock_irqrestore(&lp->lock, flags);
 241
 242         dev_kfree_skb(skb);
 243
 244         return NETDEV_TX_OK;
 245 }
 246
 247 static void uml_net_set_multicast_list(struct net_device *dev)
 248 {
 249         return;
 250 }
 251
 252 static void uml_net_tx_timeout(struct net_device *dev)
 253 {
 254         dev->trans_start = jiffies;
 255         netif_wake_queue(dev);
 256 }
 257
 258 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 259 {
 260         dev->mtu = new_mtu;
 261
 262         return 0;
 263 }
 264
 265 static void uml_net_get_drvinfo(struct net_device *dev,
 266                                 struct ethtool_drvinfo *info)
 267 {
 268         strcpy(info->driver, DRIVER_NAME);
 269         strcpy(info->version, "42");
 270 }
 271
 272 static const struct ethtool_ops uml_net_ethtool_ops = {
 273         .get_drvinfo    = uml_net_get_drvinfo,
 274         .get_link       = ethtool_op_get_link,
 275 };
 276
 277 static void uml_net_user_timer_expire(unsigned long _conn)
 278 {
 279 #ifdef undef
 280         struct connection *conn = (struct connection *)_conn;
 281
 282         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 283         do_connect(conn);
 284 #endif
 285 }
 286
 287 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
 288 {
 289         char *end;
 290         int i;
 291
 292         if (str == NULL)
 293                 goto random;
 294
 295         for (i = 0; i < 6; i++) {
 296                 addr[i] = simple_strtoul(str, &end, 16);
 297                 if ((end == str) ||
 298                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 299                         printk(KERN_ERR
 300                                "setup_etheraddr: failed to parse '%s' "
 301                                "as an ethernet address\n", str);
 302                         goto random;
 303                 }
 304                 str = end + 1;
 305         }
 306         if (is_multicast_ether_addr(addr)) {
 307                 printk(KERN_ERR
 308                        "Attempt to assign a multicast ethernet address to a "
 309                        "device disallowed\n");
 310                 goto random;
 311         }
 312         if (!is_valid_ether_addr(addr)) {
 313                 printk(KERN_ERR
 314                        "Attempt to assign an invalid ethernet address to a "
 315                        "device disallowed\n");
 316                 goto random;
 317         }
 318         if (!is_local_ether_addr(addr)) {
 319                 printk(KERN_WARNING
 320                        "Warning: Assigning a globally valid ethernet "
 321                        "address to a device\n");
 322                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 323                        "the first byte of the MAC,\n");
 324                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 325                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 326                        addr[5]);
 327         }
 328         return;
 329
 330 random:
 331         printk(KERN_INFO
 332                "Choosing a random ethernet address for device %s\n", name);
 333         random_ether_addr(addr);
 334 }
 335
 336 static DEFINE_SPINLOCK(devices_lock);
 337 static LIST_HEAD(devices);
 338
 339 static struct platform_driver uml_net_driver = {
 340         .driver = {
 341                 .name  = DRIVER_NAME,
 342         },
 343 };
 344
 345 static void net_device_release(struct device *dev)
 346 {
 347         struct uml_net *device = dev_get_drvdata(dev);
 348         struct net_device *netdev = device->dev;
 349         struct uml_net_private *lp = netdev_priv(netdev);
 350
 351         if (lp->remove != NULL)
 352                 (*lp->remove)(&lp->user);
 353         list_del(&device->list);
 354         kfree(device);
 355         free_netdev(netdev);
 356 }
 357
 358 static const struct net_device_ops uml_netdev_ops = {
 359         .ndo_open               = uml_net_open,
 360         .ndo_stop               = uml_net_close,
 361         .ndo_start_xmit         = uml_net_start_xmit,
 362         .ndo_set_multicast_list = uml_net_set_multicast_list,
 363         .ndo_tx_timeout         = uml_net_tx_timeout,
 364         .ndo_set_mac_address    = eth_mac_addr,
 365         .ndo_change_mtu         = uml_net_change_mtu,
 366         .ndo_validate_addr      = eth_validate_addr,
 367 };
 368
 369 /*
 370  * Ensures that platform_driver_register is called only once by
 371  * eth_configure.  Will be set in an initcall.
 372  */
 373 static int driver_registered;
 374
 375 static void eth_configure(int n, void *init, char *mac,
 376                           struct transport *transport)
 377 {
 378         struct uml_net *device;
 379         struct net_device *dev;
 380         struct uml_net_private *lp;
 381         int err, size;
 382
 383         size = transport->private_size + sizeof(struct uml_net_private);
 384
 385         device = kzalloc(sizeof(*device), GFP_KERNEL);
 386         if (device == NULL) {
 387                 printk(KERN_ERR "eth_configure failed to allocate struct "
 388                        "uml_net\n");
 389                 return;
 390         }
 391
 392         dev = alloc_etherdev(size);
 393         if (dev == NULL) {
 394                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 395                        "net_device for eth%d\n", n);
 396                 goto out_free_device;
 397         }
 398
 399         INIT_LIST_HEAD(&device->list);
 400         device->index = n;
 401
 402         /* If this name ends up conflicting with an existing registered
 403          * netdevice, that is OK, register_netdev{,ice}() will notice this
 404          * and fail.
 405          */
 406         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 407
 408         setup_etheraddr(mac, device->mac, dev->name);
 409
 410         printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac);
 411
 412         lp = netdev_priv(dev);
 413         /* This points to the transport private data. It's still clear, but we
 414          * must memset it to 0 *now*. Let's help the drivers. */
 415         memset(lp, 0, size);
 416         INIT_WORK(&lp->work, uml_dev_close);
 417
 418         /* sysfs register */
 419         if (!driver_registered) {
 420                 platform_driver_register(&uml_net_driver);
 421                 driver_registered = 1;
 422         }
 423         device->pdev.id = n;
 424         device->pdev.name = DRIVER_NAME;
 425         device->pdev.dev.release = net_device_release;
 426         dev_set_drvdata(&device->pdev.dev, device);
 427         if (platform_device_register(&device->pdev))
 428                 goto out_free_netdev;
 429         SET_NETDEV_DEV(dev,&device->pdev.dev);
 430
 431         device->dev = dev;
 432
 433         /*
 434          * These just fill in a data structure, so there's no failure
 435          * to be worried about.
 436          */
 437         (*transport->kern->init)(dev, init);
 438
 439         *lp = ((struct uml_net_private)
 440                 { .list                 = LIST_HEAD_INIT(lp->list),
 441                   .dev                  = dev,
 442                   .fd                   = -1,
 443                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 444                   .max_packet           = transport->user->max_packet,
 445                   .protocol             = transport->kern->protocol,
 446                   .open                 = transport->user->open,
 447                   .close                = transport->user->close,
 448                   .remove               = transport->user->remove,
 449                   .read                 = transport->kern->read,
 450                   .write                = transport->kern->write,
 451                   .add_address          = transport->user->add_address,
 452                   .delete_address       = transport->user->delete_address });
 453
 454         init_timer(&lp->tl);
 455         spin_lock_init(&lp->lock);
 456         lp->tl.function = uml_net_user_timer_expire;
 457         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 458
 459         if ((transport->user->init != NULL) &&
 460             ((*transport->user->init)(&lp->user, dev) != 0))
 461                 goto out_unregister;
 462
 463         /* don't use eth_mac_addr, it will not work here */
 464         memcpy(dev->dev_addr, device->mac, ETH_ALEN);
 465         dev->mtu = transport->user->mtu;
 466         dev->netdev_ops = &uml_netdev_ops;
 467         dev->ethtool_ops = &uml_net_ethtool_ops;
 468         dev->watchdog_timeo = (HZ >> 1);
 469         dev->irq = UM_ETH_IRQ;
 470
 471         err = update_drop_skb(lp->max_packet);
 472         if (err)
 473                 goto out_undo_user_init;
 474
 475         rtnl_lock();
 476         err = register_netdevice(dev);
 477         rtnl_unlock();
 478         if (err)
 479                 goto out_undo_user_init;
 480
 481         spin_lock(&devices_lock);
 482         list_add(&device->list, &devices);
 483         spin_unlock(&devices_lock);
 484
 485         return;
 486
 487 out_undo_user_init:
 488         if (transport->user->remove != NULL)
 489                 (*transport->user->remove)(&lp->user);
 490 out_unregister:
 491         platform_device_unregister(&device->pdev);
 492         return; /* platform_device_unregister frees dev and device */
 493 out_free_netdev:
 494         free_netdev(dev);
 495 out_free_device:
 496         kfree(device);
 497 }
 498
 499 static struct uml_net *find_device(int n)
 500 {
 501         struct uml_net *device;
 502         struct list_head *ele;
 503
 504         spin_lock(&devices_lock);
 505         list_for_each(ele, &devices) {
 506                 device = list_entry(ele, struct uml_net, list);
 507                 if (device->index == n)
 508                         goto out;
 509         }
 510         device = NULL;
 511  out:
 512         spin_unlock(&devices_lock);
 513         return device;
 514 }
 515
 516 static int eth_parse(char *str, int *index_out, char **str_out,
 517                      char **error_out)
 518 {
 519         char *end;
 520         int n, err = -EINVAL;
 521
 522         n = simple_strtoul(str, &end, 0);
 523         if (end == str) {
 524                 *error_out = "Bad device number";
 525                 return err;
 526         }
 527
 528         str = end;
 529         if (*str != '=') {
 530                 *error_out = "Expected '=' after device number";
 531                 return err;
 532         }
 533
 534         str++;
 535         if (find_device(n)) {
 536                 *error_out = "Device already configured";
 537                 return err;
 538         }
 539
 540         *index_out = n;
 541         *str_out = str;
 542         return 0;
 543 }
 544
 545 struct eth_init {
 546         struct list_head list;
 547         char *init;
 548         int index;
 549 };
 550
 551 static DEFINE_SPINLOCK(transports_lock);
 552 static LIST_HEAD(transports);
 553
 554 /* Filled in during early boot */
 555 static LIST_HEAD(eth_cmd_line);
 556
 557 static int check_transport(struct transport *transport, char *eth, int n,
 558                            void **init_out, char **mac_out)
 559 {
 560         int len;
 561
 562         len = strlen(transport->name);
 563         if (strncmp(eth, transport->name, len))
 564                 return 0;
 565
 566         eth += len;
 567         if (*eth == ',')
 568                 eth++;
 569         else if (*eth != '\0')
 570                 return 0;
 571
 572         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 573         if (*init_out == NULL)
 574                 return 1;
 575
 576         if (!transport->setup(eth, mac_out, *init_out)) {
 577                 kfree(*init_out);
 578                 *init_out = NULL;
 579         }
 580         return 1;
 581 }
 582
 583 void register_transport(struct transport *new)
 584 {
 585         struct list_head *ele, *next;
 586         struct eth_init *eth;
 587         void *init;
 588         char *mac = NULL;
 589         int match;
 590
 591         spin_lock(&transports_lock);
 592         BUG_ON(!list_empty(&new->list));
 593         list_add(&new->list, &transports);
 594         spin_unlock(&transports_lock);
 595
 596         list_for_each_safe(ele, next, &eth_cmd_line) {
 597                 eth = list_entry(ele, struct eth_init, list);
 598                 match = check_transport(new, eth->init, eth->index, &init,
 599                                         &mac);
 600                 if (!match)
 601                         continue;
 602                 else if (init != NULL) {
 603                         eth_configure(eth->index, init, mac, new);
 604                         kfree(init);
 605                 }
 606                 list_del(&eth->list);
 607         }
 608 }
 609
 610 static int eth_setup_common(char *str, int index)
 611 {
 612         struct list_head *ele;
 613         struct transport *transport;
 614         void *init;
 615         char *mac = NULL;
 616         int found = 0;
 617
 618         spin_lock(&transports_lock);
 619         list_for_each(ele, &transports) {
 620                 transport = list_entry(ele, struct transport, list);
 621                 if (!check_transport(transport, str, index, &init, &mac))
 622                         continue;
 623                 if (init != NULL) {
 624                         eth_configure(index, init, mac, transport);
 625                         kfree(init);
 626                 }
 627                 found = 1;
 628                 break;
 629         }
 630
 631         spin_unlock(&transports_lock);
 632         return found;
 633 }
 634
 635 static int __init eth_setup(char *str)
 636 {
 637         struct eth_init *new;
 638         char *error;
 639         int n, err;
 640
 641         err = eth_parse(str, &n, &str, &error);
 642         if (err) {
 643                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 644                        str, error);
 645                 return 1;
 646         }
 647
 648         new = alloc_bootmem(sizeof(*new));
 649         if (new == NULL) {
 650                 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
 651                 return 1;
 652         }
 653
 654         INIT_LIST_HEAD(&new->list);
 655         new->index = n;
 656         new->init = str;
 657
 658         list_add_tail(&new->list, &eth_cmd_line);
 659         return 1;
 660 }
 661
 662 __setup("eth", eth_setup);
 663 __uml_help(eth_setup,
 664 "eth[0-9]+=<transport>,<options>\n"
 665 "    Configure a network device.\n\n"
 666 );
 667
 668 static int net_config(char *str, char **error_out)
 669 {
 670         int n, err;
 671
 672         err = eth_parse(str, &n, &str, error_out);
 673         if (err)
 674                 return err;
 675
 676         /* This string is broken up and the pieces used by the underlying
 677          * driver.  So, it is freed only if eth_setup_common fails.
 678          */
 679         str = kstrdup(str, GFP_KERNEL);
 680         if (str == NULL) {
 681                 *error_out = "net_config failed to strdup string";
 682                 return -ENOMEM;
 683         }
 684         err = !eth_setup_common(str, n);
 685         if (err)
 686                 kfree(str);
 687         return err;
 688 }
 689
 690 static int net_id(char **str, int *start_out, int *end_out)
 691 {
 692         char *end;
 693         int n;
 694
 695         n = simple_strtoul(*str, &end, 0);
 696         if ((*end != '\0') || (end == *str))
 697                 return -1;
 698
 699         *start_out = n;
 700         *end_out = n;
 701         *str = end;
 702         return n;
 703 }
 704
 705 static int net_remove(int n, char **error_out)
 706 {
 707         struct uml_net *device;
 708         struct net_device *dev;
 709         struct uml_net_private *lp;
 710
 711         device = find_device(n);
 712         if (device == NULL)
 713                 return -ENODEV;
 714
 715         dev = device->dev;
 716         lp = netdev_priv(dev);
 717         if (lp->fd > 0)
 718                 return -EBUSY;
 719         unregister_netdev(dev);
 720         platform_device_unregister(&device->pdev);
 721
 722         return 0;
 723 }
 724
 725 static struct mc_device net_mc = {
 726         .list           = LIST_HEAD_INIT(net_mc.list),
 727         .name           = "eth",
 728         .config         = net_config,
 729         .get_config     = NULL,
 730         .id             = net_id,
 731         .remove         = net_remove,
 732 };
 733
 734 #ifdef CONFIG_INET
 735 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 736                               void *ptr)
 737 {
 738         struct in_ifaddr *ifa = ptr;
 739         struct net_device *dev = ifa->ifa_dev->dev;
 740         struct uml_net_private *lp;
 741         void (*proc)(unsigned char *, unsigned char *, void *);
 742         unsigned char addr_buf[4], netmask_buf[4];
 743
 744         if (dev->netdev_ops->ndo_open != uml_net_open)
 745                 return NOTIFY_DONE;
 746
 747         lp = netdev_priv(dev);
 748
 749         proc = NULL;
 750         switch (event) {
 751         case NETDEV_UP:
 752                 proc = lp->add_address;
 753                 break;
 754         case NETDEV_DOWN:
 755                 proc = lp->delete_address;
 756                 break;
 757         }
 758         if (proc != NULL) {
 759                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 760                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 761                 (*proc)(addr_buf, netmask_buf, &lp->user);
 762         }
 763         return NOTIFY_DONE;
 764 }
 765
 766 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 767 static struct notifier_block uml_inetaddr_notifier = {
 768         .notifier_call          = uml_inetaddr_event,
 769 };
 770
 771 static void inet_register(void)
 772 {
 773         struct list_head *ele;
 774         struct uml_net_private *lp;
 775         struct in_device *ip;
 776         struct in_ifaddr *in;
 777
 778         register_inetaddr_notifier(&uml_inetaddr_notifier);
 779
 780         /* Devices may have been opened already, so the uml_inetaddr_notifier
 781          * didn't get a chance to run for them.  This fakes it so that
 782          * addresses which have already been set up get handled properly.
 783          */
 784         spin_lock(&opened_lock);
 785         list_for_each(ele, &opened) {
 786                 lp = list_entry(ele, struct uml_net_private, list);
 787                 ip = lp->dev->ip_ptr;
 788                 if (ip == NULL)
 789                         continue;
 790                 in = ip->ifa_list;
 791                 while (in != NULL) {
 792                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 793                         in = in->ifa_next;
 794                 }
 795         }
 796         spin_unlock(&opened_lock);
 797 }
 798 #else
 799 static inline void inet_register(void)
 800 {
 801 }
 802 #endif
 803
 804 static int uml_net_init(void)
 805 {
 806         mconsole_register_dev(&net_mc);
 807         inet_register();
 808         return 0;
 809 }
 810
 811 __initcall(uml_net_init);
 812
 813 static void close_devices(void)
 814 {
 815         struct list_head *ele;
 816         struct uml_net_private *lp;
 817
 818         spin_lock(&opened_lock);
 819         list_for_each(ele, &opened) {
 820                 lp = list_entry(ele, struct uml_net_private, list);
 821                 free_irq(lp->dev->irq, lp->dev);
 822                 if ((lp->close != NULL) && (lp->fd >= 0))
 823                         (*lp->close)(lp->fd, &lp->user);
 824                 if (lp->remove != NULL)
 825                         (*lp->remove)(&lp->user);
 826         }
 827         spin_unlock(&opened_lock);
 828 }
 829
 830 __uml_exitcall(close_devices);
 831
 832 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 833                                         void *),
 834                     void *arg)
 835 {
 836         struct net_device *dev = d;
 837         struct in_device *ip = dev->ip_ptr;
 838         struct in_ifaddr *in;
 839         unsigned char address[4], netmask[4];
 840
 841         if (ip == NULL) return;
 842         in = ip->ifa_list;
 843         while (in != NULL) {
 844                 memcpy(address, &in->ifa_address, sizeof(address));
 845                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 846                 (*cb)(address, netmask, arg);
 847                 in = in->ifa_next;
 848         }
 849 }
 850
 851 int dev_netmask(void *d, void *m)
 852 {
 853         struct net_device *dev = d;
 854         struct in_device *ip = dev->ip_ptr;
 855         struct in_ifaddr *in;
 856         __be32 *mask_out = m;
 857
 858         if (ip == NULL)
 859                 return 1;
 860
 861         in = ip->ifa_list;
 862         if (in == NULL)
 863                 return 1;
 864
 865         *mask_out = in->ifa_mask;
 866         return 0;
 867 }
 868
 869 void *get_output_buffer(int *len_out)
 870 {
 871         void *ret;
 872
 873         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 874         if (ret) *len_out = PAGE_SIZE;
 875         else *len_out = 0;
 876         return ret;
 877 }
 878
 879 void free_output_buffer(void *buffer)
 880 {
 881         free_pages((unsigned long) buffer, 0);
 882 }
 883
 884 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 885                      char **gate_addr)
 886 {
 887         char *remain;
 888
 889         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 890         if (remain != NULL) {
 891                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 892                        "specification : '%s'\n", remain);
 893                 return 1;
 894         }
 895
 896         return 0;
 897 }
 898
 899 unsigned short eth_protocol(struct sk_buff *skb)
 900 {
 901         return eth_type_trans(skb, skb->dev);
 902 }