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/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_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         um_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         skb_tx_timestamp(skb);
 222
 223         if (len == skb->len) {
 224                 dev->stats.tx_packets++;
 225                 dev->stats.tx_bytes += skb->len;
 226                 netif_trans_update(dev);
 227                 netif_start_queue(dev);
 228
 229                 /* this is normally done in the interrupt when tx finishes */
 230                 netif_wake_queue(dev);
 231         }
 232         else if (len == 0) {
 233                 netif_start_queue(dev);
 234                 dev->stats.tx_dropped++;
 235         }
 236         else {
 237                 netif_start_queue(dev);
 238                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 239         }
 240
 241         spin_unlock_irqrestore(&lp->lock, flags);
 242
 243         dev_consume_skb_any(skb);
 244
 245         return NETDEV_TX_OK;
 246 }
 247
 248 static void uml_net_set_multicast_list(struct net_device *dev)
 249 {
 250         return;
 251 }
 252
 253 static void uml_net_tx_timeout(struct net_device *dev)
 254 {
 255         netif_trans_update(dev);
 256         netif_wake_queue(dev);
 257 }
 258
 259 #ifdef CONFIG_NET_POLL_CONTROLLER
 260 static void uml_net_poll_controller(struct net_device *dev)
 261 {
 262         disable_irq(dev->irq);
 263         uml_net_interrupt(dev->irq, dev);
 264         enable_irq(dev->irq);
 265 }
 266 #endif
 267
 268 static void uml_net_get_drvinfo(struct net_device *dev,
 269                                 struct ethtool_drvinfo *info)
 270 {
 271         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 272         strlcpy(info->version, "42", sizeof(info->version));
 273 }
 274
 275 static const struct ethtool_ops uml_net_ethtool_ops = {
 276         .get_drvinfo    = uml_net_get_drvinfo,
 277         .get_link       = ethtool_op_get_link,
 278         .get_ts_info    = ethtool_op_get_ts_info,
 279 };
 280
 281 static void uml_net_user_timer_expire(unsigned long _conn)
 282 {
 283 #ifdef undef
 284         struct connection *conn = (struct connection *)_conn;
 285
 286         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 287         do_connect(conn);
 288 #endif
 289 }
 290
 291 static void setup_etheraddr(struct net_device *dev, char *str)
 292 {
 293         unsigned char *addr = dev->dev_addr;
 294         char *end;
 295         int i;
 296
 297         if (str == NULL)
 298                 goto random;
 299
 300         for (i = 0; i < 6; i++) {
 301                 addr[i] = simple_strtoul(str, &end, 16);
 302                 if ((end == str) ||
 303                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 304                         printk(KERN_ERR
 305                                "setup_etheraddr: failed to parse '%s' "
 306                                "as an ethernet address\n", str);
 307                         goto random;
 308                 }
 309                 str = end + 1;
 310         }
 311         if (is_multicast_ether_addr(addr)) {
 312                 printk(KERN_ERR
 313                        "Attempt to assign a multicast ethernet address to a "
 314                        "device disallowed\n");
 315                 goto random;
 316         }
 317         if (!is_valid_ether_addr(addr)) {
 318                 printk(KERN_ERR
 319                        "Attempt to assign an invalid ethernet address to a "
 320                        "device disallowed\n");
 321                 goto random;
 322         }
 323         if (!is_local_ether_addr(addr)) {
 324                 printk(KERN_WARNING
 325                        "Warning: Assigning a globally valid ethernet "
 326                        "address to a device\n");
 327                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 328                        "the first byte of the MAC,\n");
 329                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 330                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 331                        addr[5]);
 332         }
 333         return;
 334
 335 random:
 336         printk(KERN_INFO
 337                "Choosing a random ethernet address for device %s\n", dev->name);
 338         eth_hw_addr_random(dev);
 339 }
 340
 341 static DEFINE_SPINLOCK(devices_lock);
 342 static LIST_HEAD(devices);
 343
 344 static struct platform_driver uml_net_driver = {
 345         .driver = {
 346                 .name  = DRIVER_NAME,
 347         },
 348 };
 349
 350 static void net_device_release(struct device *dev)
 351 {
 352         struct uml_net *device = dev_get_drvdata(dev);
 353         struct net_device *netdev = device->dev;
 354         struct uml_net_private *lp = netdev_priv(netdev);
 355
 356         if (lp->remove != NULL)
 357                 (*lp->remove)(&lp->user);
 358         list_del(&device->list);
 359         kfree(device);
 360         free_netdev(netdev);
 361 }
 362
 363 static const struct net_device_ops uml_netdev_ops = {
 364         .ndo_open               = uml_net_open,
 365         .ndo_stop               = uml_net_close,
 366         .ndo_start_xmit         = uml_net_start_xmit,
 367         .ndo_set_rx_mode        = uml_net_set_multicast_list,
 368         .ndo_tx_timeout         = uml_net_tx_timeout,
 369         .ndo_set_mac_address    = eth_mac_addr,
 370         .ndo_validate_addr      = eth_validate_addr,
 371 #ifdef CONFIG_NET_POLL_CONTROLLER
 372         .ndo_poll_controller = uml_net_poll_controller,
 373 #endif
 374 };
 375
 376 /*
 377  * Ensures that platform_driver_register is called only once by
 378  * eth_configure.  Will be set in an initcall.
 379  */
 380 static int driver_registered;
 381
 382 static void eth_configure(int n, void *init, char *mac,
 383                           struct transport *transport, gfp_t gfp_mask)
 384 {
 385         struct uml_net *device;
 386         struct net_device *dev;
 387         struct uml_net_private *lp;
 388         int err, size;
 389
 390         size = transport->private_size + sizeof(struct uml_net_private);
 391
 392         device = kzalloc(sizeof(*device), gfp_mask);
 393         if (device == NULL) {
 394                 printk(KERN_ERR "eth_configure failed to allocate struct "
 395                        "uml_net\n");
 396                 return;
 397         }
 398
 399         dev = alloc_etherdev(size);
 400         if (dev == NULL) {
 401                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 402                        "net_device for eth%d\n", n);
 403                 goto out_free_device;
 404         }
 405
 406         INIT_LIST_HEAD(&device->list);
 407         device->index = n;
 408
 409         /* If this name ends up conflicting with an existing registered
 410          * netdevice, that is OK, register_netdev{,ice}() will notice this
 411          * and fail.
 412          */
 413         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 414
 415         setup_etheraddr(dev, mac);
 416
 417         printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
 418
 419         lp = netdev_priv(dev);
 420         /* This points to the transport private data. It's still clear, but we
 421          * must memset it to 0 *now*. Let's help the drivers. */
 422         memset(lp, 0, size);
 423         INIT_WORK(&lp->work, uml_dev_close);
 424
 425         /* sysfs register */
 426         if (!driver_registered) {
 427                 platform_driver_register(&uml_net_driver);
 428                 driver_registered = 1;
 429         }
 430         device->pdev.id = n;
 431         device->pdev.name = DRIVER_NAME;
 432         device->pdev.dev.release = net_device_release;
 433         dev_set_drvdata(&device->pdev.dev, device);
 434         if (platform_device_register(&device->pdev))
 435                 goto out_free_netdev;
 436         SET_NETDEV_DEV(dev,&device->pdev.dev);
 437
 438         device->dev = dev;
 439
 440         /*
 441          * These just fill in a data structure, so there's no failure
 442          * to be worried about.
 443          */
 444         (*transport->kern->init)(dev, init);
 445
 446         *lp = ((struct uml_net_private)
 447                 { .list                 = LIST_HEAD_INIT(lp->list),
 448                   .dev                  = dev,
 449                   .fd                   = -1,
 450                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 451                   .max_packet           = transport->user->max_packet,
 452                   .protocol             = transport->kern->protocol,
 453                   .open                 = transport->user->open,
 454                   .close                = transport->user->close,
 455                   .remove               = transport->user->remove,
 456                   .read                 = transport->kern->read,
 457                   .write                = transport->kern->write,
 458                   .add_address          = transport->user->add_address,
 459                   .delete_address       = transport->user->delete_address });
 460
 461         init_timer(&lp->tl);
 462         spin_lock_init(&lp->lock);
 463         lp->tl.function = uml_net_user_timer_expire;
 464         memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
 465
 466         if ((transport->user->init != NULL) &&
 467             ((*transport->user->init)(&lp->user, dev) != 0))
 468                 goto out_unregister;
 469
 470         dev->mtu = transport->user->mtu;
 471         dev->netdev_ops = &uml_netdev_ops;
 472         dev->ethtool_ops = &uml_net_ethtool_ops;
 473         dev->watchdog_timeo = (HZ >> 1);
 474         dev->irq = UM_ETH_IRQ;
 475
 476         err = update_drop_skb(lp->max_packet);
 477         if (err)
 478                 goto out_undo_user_init;
 479
 480         rtnl_lock();
 481         err = register_netdevice(dev);
 482         rtnl_unlock();
 483         if (err)
 484                 goto out_undo_user_init;
 485
 486         spin_lock(&devices_lock);
 487         list_add(&device->list, &devices);
 488         spin_unlock(&devices_lock);
 489
 490         return;
 491
 492 out_undo_user_init:
 493         if (transport->user->remove != NULL)
 494                 (*transport->user->remove)(&lp->user);
 495 out_unregister:
 496         platform_device_unregister(&device->pdev);
 497         return; /* platform_device_unregister frees dev and device */
 498 out_free_netdev:
 499         free_netdev(dev);
 500 out_free_device:
 501         kfree(device);
 502 }
 503
 504 static struct uml_net *find_device(int n)
 505 {
 506         struct uml_net *device;
 507         struct list_head *ele;
 508
 509         spin_lock(&devices_lock);
 510         list_for_each(ele, &devices) {
 511                 device = list_entry(ele, struct uml_net, list);
 512                 if (device->index == n)
 513                         goto out;
 514         }
 515         device = NULL;
 516  out:
 517         spin_unlock(&devices_lock);
 518         return device;
 519 }
 520
 521 static int eth_parse(char *str, int *index_out, char **str_out,
 522                      char **error_out)
 523 {
 524         char *end;
 525         int n, err = -EINVAL;
 526
 527         n = simple_strtoul(str, &end, 0);
 528         if (end == str) {
 529                 *error_out = "Bad device number";
 530                 return err;
 531         }
 532
 533         str = end;
 534         if (*str != '=') {
 535                 *error_out = "Expected '=' after device number";
 536                 return err;
 537         }
 538
 539         str++;
 540         if (find_device(n)) {
 541                 *error_out = "Device already configured";
 542                 return err;
 543         }
 544
 545         *index_out = n;
 546         *str_out = str;
 547         return 0;
 548 }
 549
 550 struct eth_init {
 551         struct list_head list;
 552         char *init;
 553         int index;
 554 };
 555
 556 static DEFINE_SPINLOCK(transports_lock);
 557 static LIST_HEAD(transports);
 558
 559 /* Filled in during early boot */
 560 static LIST_HEAD(eth_cmd_line);
 561
 562 static int check_transport(struct transport *transport, char *eth, int n,
 563                            void **init_out, char **mac_out, gfp_t gfp_mask)
 564 {
 565         int len;
 566
 567         len = strlen(transport->name);
 568         if (strncmp(eth, transport->name, len))
 569                 return 0;
 570
 571         eth += len;
 572         if (*eth == ',')
 573                 eth++;
 574         else if (*eth != '\0')
 575                 return 0;
 576
 577         *init_out = kmalloc(transport->setup_size, gfp_mask);
 578         if (*init_out == NULL)
 579                 return 1;
 580
 581         if (!transport->setup(eth, mac_out, *init_out)) {
 582                 kfree(*init_out);
 583                 *init_out = NULL;
 584         }
 585         return 1;
 586 }
 587
 588 void register_transport(struct transport *new)
 589 {
 590         struct list_head *ele, *next;
 591         struct eth_init *eth;
 592         void *init;
 593         char *mac = NULL;
 594         int match;
 595
 596         spin_lock(&transports_lock);
 597         BUG_ON(!list_empty(&new->list));
 598         list_add(&new->list, &transports);
 599         spin_unlock(&transports_lock);
 600
 601         list_for_each_safe(ele, next, &eth_cmd_line) {
 602                 eth = list_entry(ele, struct eth_init, list);
 603                 match = check_transport(new, eth->init, eth->index, &init,
 604                                         &mac, GFP_KERNEL);
 605                 if (!match)
 606                         continue;
 607                 else if (init != NULL) {
 608                         eth_configure(eth->index, init, mac, new, GFP_KERNEL);
 609                         kfree(init);
 610                 }
 611                 list_del(&eth->list);
 612         }
 613 }
 614
 615 static int eth_setup_common(char *str, int index)
 616 {
 617         struct list_head *ele;
 618         struct transport *transport;
 619         void *init;
 620         char *mac = NULL;
 621         int found = 0;
 622
 623         spin_lock(&transports_lock);
 624         list_for_each(ele, &transports) {
 625                 transport = list_entry(ele, struct transport, list);
 626                 if (!check_transport(transport, str, index, &init,
 627                                         &mac, GFP_ATOMIC))
 628                         continue;
 629                 if (init != NULL) {
 630                         eth_configure(index, init, mac, transport, GFP_ATOMIC);
 631                         kfree(init);
 632                 }
 633                 found = 1;
 634                 break;
 635         }
 636
 637         spin_unlock(&transports_lock);
 638         return found;
 639 }
 640
 641 static int __init eth_setup(char *str)
 642 {
 643         struct eth_init *new;
 644         char *error;
 645         int n, err;
 646
 647         err = eth_parse(str, &n, &str, &error);
 648         if (err) {
 649                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 650                        str, error);
 651                 return 1;
 652         }
 653
 654         new = alloc_bootmem(sizeof(*new));
 655
 656         INIT_LIST_HEAD(&new->list);
 657         new->index = n;
 658         new->init = str;
 659
 660         list_add_tail(&new->list, &eth_cmd_line);
 661         return 1;
 662 }
 663
 664 __setup("eth", eth_setup);
 665 __uml_help(eth_setup,
 666 "eth[0-9]+=<transport>,<options>\n"
 667 "    Configure a network device.\n\n"
 668 );
 669
 670 static int net_config(char *str, char **error_out)
 671 {
 672         int n, err;
 673
 674         err = eth_parse(str, &n, &str, error_out);
 675         if (err)
 676                 return err;
 677
 678         /* This string is broken up and the pieces used by the underlying
 679          * driver.  So, it is freed only if eth_setup_common fails.
 680          */
 681         str = kstrdup(str, GFP_KERNEL);
 682         if (str == NULL) {
 683                 *error_out = "net_config failed to strdup string";
 684                 return -ENOMEM;
 685         }
 686         err = !eth_setup_common(str, n);
 687         if (err)
 688                 kfree(str);
 689         return err;
 690 }
 691
 692 static int net_id(char **str, int *start_out, int *end_out)
 693 {
 694         char *end;
 695         int n;
 696
 697         n = simple_strtoul(*str, &end, 0);
 698         if ((*end != '\0') || (end == *str))
 699                 return -1;
 700
 701         *start_out = n;
 702         *end_out = n;
 703         *str = end;
 704         return n;
 705 }
 706
 707 static int net_remove(int n, char **error_out)
 708 {
 709         struct uml_net *device;
 710         struct net_device *dev;
 711         struct uml_net_private *lp;
 712
 713         device = find_device(n);
 714         if (device == NULL)
 715                 return -ENODEV;
 716
 717         dev = device->dev;
 718         lp = netdev_priv(dev);
 719         if (lp->fd > 0)
 720                 return -EBUSY;
 721         unregister_netdev(dev);
 722         platform_device_unregister(&device->pdev);
 723
 724         return 0;
 725 }
 726
 727 static struct mc_device net_mc = {
 728         .list           = LIST_HEAD_INIT(net_mc.list),
 729         .name           = "eth",
 730         .config         = net_config,
 731         .get_config     = NULL,
 732         .id             = net_id,
 733         .remove         = net_remove,
 734 };
 735
 736 #ifdef CONFIG_INET
 737 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 738                               void *ptr)
 739 {
 740         struct in_ifaddr *ifa = ptr;
 741         struct net_device *dev = ifa->ifa_dev->dev;
 742         struct uml_net_private *lp;
 743         void (*proc)(unsigned char *, unsigned char *, void *);
 744         unsigned char addr_buf[4], netmask_buf[4];
 745
 746         if (dev->netdev_ops->ndo_open != uml_net_open)
 747                 return NOTIFY_DONE;
 748
 749         lp = netdev_priv(dev);
 750
 751         proc = NULL;
 752         switch (event) {
 753         case NETDEV_UP:
 754                 proc = lp->add_address;
 755                 break;
 756         case NETDEV_DOWN:
 757                 proc = lp->delete_address;
 758                 break;
 759         }
 760         if (proc != NULL) {
 761                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 762                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 763                 (*proc)(addr_buf, netmask_buf, &lp->user);
 764         }
 765         return NOTIFY_DONE;
 766 }
 767
 768 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 769 static struct notifier_block uml_inetaddr_notifier = {
 770         .notifier_call          = uml_inetaddr_event,
 771 };
 772
 773 static void inet_register(void)
 774 {
 775         struct list_head *ele;
 776         struct uml_net_private *lp;
 777         struct in_device *ip;
 778         struct in_ifaddr *in;
 779
 780         register_inetaddr_notifier(&uml_inetaddr_notifier);
 781
 782         /* Devices may have been opened already, so the uml_inetaddr_notifier
 783          * didn't get a chance to run for them.  This fakes it so that
 784          * addresses which have already been set up get handled properly.
 785          */
 786         spin_lock(&opened_lock);
 787         list_for_each(ele, &opened) {
 788                 lp = list_entry(ele, struct uml_net_private, list);
 789                 ip = lp->dev->ip_ptr;
 790                 if (ip == NULL)
 791                         continue;
 792                 in = ip->ifa_list;
 793                 while (in != NULL) {
 794                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 795                         in = in->ifa_next;
 796                 }
 797         }
 798         spin_unlock(&opened_lock);
 799 }
 800 #else
 801 static inline void inet_register(void)
 802 {
 803 }
 804 #endif
 805
 806 static int uml_net_init(void)
 807 {
 808         mconsole_register_dev(&net_mc);
 809         inet_register();
 810         return 0;
 811 }
 812
 813 __initcall(uml_net_init);
 814
 815 static void close_devices(void)
 816 {
 817         struct list_head *ele;
 818         struct uml_net_private *lp;
 819
 820         spin_lock(&opened_lock);
 821         list_for_each(ele, &opened) {
 822                 lp = list_entry(ele, struct uml_net_private, list);
 823                 um_free_irq(lp->dev->irq, lp->dev);
 824                 if ((lp->close != NULL) && (lp->fd >= 0))
 825                         (*lp->close)(lp->fd, &lp->user);
 826                 if (lp->remove != NULL)
 827                         (*lp->remove)(&lp->user);
 828         }
 829         spin_unlock(&opened_lock);
 830 }
 831
 832 __uml_exitcall(close_devices);
 833
 834 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 835                                         void *),
 836                     void *arg)
 837 {
 838         struct net_device *dev = d;
 839         struct in_device *ip = dev->ip_ptr;
 840         struct in_ifaddr *in;
 841         unsigned char address[4], netmask[4];
 842
 843         if (ip == NULL) return;
 844         in = ip->ifa_list;
 845         while (in != NULL) {
 846                 memcpy(address, &in->ifa_address, sizeof(address));
 847                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 848                 (*cb)(address, netmask, arg);
 849                 in = in->ifa_next;
 850         }
 851 }
 852
 853 int dev_netmask(void *d, void *m)
 854 {
 855         struct net_device *dev = d;
 856         struct in_device *ip = dev->ip_ptr;
 857         struct in_ifaddr *in;
 858         __be32 *mask_out = m;
 859
 860         if (ip == NULL)
 861                 return 1;
 862
 863         in = ip->ifa_list;
 864         if (in == NULL)
 865                 return 1;
 866
 867         *mask_out = in->ifa_mask;
 868         return 0;
 869 }
 870
 871 void *get_output_buffer(int *len_out)
 872 {
 873         void *ret;
 874
 875         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 876         if (ret) *len_out = PAGE_SIZE;
 877         else *len_out = 0;
 878         return ret;
 879 }
 880
 881 void free_output_buffer(void *buffer)
 882 {
 883         free_pages((unsigned long) buffer, 0);
 884 }
 885
 886 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 887                      char **gate_addr)
 888 {
 889         char *remain;
 890
 891         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 892         if (remain != NULL) {
 893                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 894                        "specification : '%s'\n", remain);
 895                 return 1;
 896         }
 897
 898         return 0;
 899 }
 900
 901 unsigned short eth_protocol(struct sk_buff *skb)
 902 {
 903         return eth_type_trans(skb, skb->dev);
 904 }