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         netif_start_queue(dev);
 172
 173         /* clear buffer - it can happen that the host side of the interface
 174          * is full when we get here.  In this case, new data is never queued,
 175          * SIGIOs never arrive, and the net never works.
 176          */
 177         while ((err = uml_net_rx(dev)) > 0) ;
 178
 179         spin_lock(&opened_lock);
 180         list_add(&lp->list, &opened);
 181         spin_unlock(&opened_lock);
 182
 183         return 0;
 184 out_close:
 185         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 186         lp->fd = -1;
 187 out:
 188         return err;
 189 }
 190
 191 static int uml_net_close(struct net_device *dev)
 192 {
 193         struct uml_net_private *lp = netdev_priv(dev);
 194
 195         netif_stop_queue(dev);
 196
 197         um_free_irq(dev->irq, dev);
 198         if (lp->close != NULL)
 199                 (*lp->close)(lp->fd, &lp->user);
 200         lp->fd = -1;
 201
 202         spin_lock(&opened_lock);
 203         list_del(&lp->list);
 204         spin_unlock(&opened_lock);
 205
 206         return 0;
 207 }
 208
 209 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 210 {
 211         struct uml_net_private *lp = netdev_priv(dev);
 212         unsigned long flags;
 213         int len;
 214
 215         netif_stop_queue(dev);
 216
 217         spin_lock_irqsave(&lp->lock, flags);
 218
 219         len = (*lp->write)(lp->fd, skb, lp);
 220         skb_tx_timestamp(skb);
 221
 222         if (len == skb->len) {
 223                 dev->stats.tx_packets++;
 224                 dev->stats.tx_bytes += skb->len;
 225                 netif_trans_update(dev);
 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_consume_skb_any(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         netif_trans_update(dev);
 255         netif_wake_queue(dev);
 256 }
 257
 258 #ifdef CONFIG_NET_POLL_CONTROLLER
 259 static void uml_net_poll_controller(struct net_device *dev)
 260 {
 261         disable_irq(dev->irq);
 262         uml_net_interrupt(dev->irq, dev);
 263         enable_irq(dev->irq);
 264 }
 265 #endif
 266
 267 static void uml_net_get_drvinfo(struct net_device *dev,
 268                                 struct ethtool_drvinfo *info)
 269 {
 270         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 271         strlcpy(info->version, "42", sizeof(info->version));
 272 }
 273
 274 static const struct ethtool_ops uml_net_ethtool_ops = {
 275         .get_drvinfo    = uml_net_get_drvinfo,
 276         .get_link       = ethtool_op_get_link,
 277         .get_ts_info    = ethtool_op_get_ts_info,
 278 };
 279
 280 static void uml_net_user_timer_expire(struct timer_list *t)
 281 {
 282 #ifdef undef
 283         struct uml_net_private *lp = from_timer(lp, t, tl);
 284         struct connection *conn = &lp->user;
 285
 286         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 287         do_connect(conn);
 288 #endif
 289 }
 290
 291 void uml_net_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         uml_net_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         timer_setup(&lp->tl, uml_net_user_timer_expire, 0);
 462         spin_lock_init(&lp->lock);
 463         memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
 464
 465         if ((transport->user->init != NULL) &&
 466             ((*transport->user->init)(&lp->user, dev) != 0))
 467                 goto out_unregister;
 468
 469         dev->mtu = transport->user->mtu;
 470         dev->netdev_ops = &uml_netdev_ops;
 471         dev->ethtool_ops = &uml_net_ethtool_ops;
 472         dev->watchdog_timeo = (HZ >> 1);
 473         dev->irq = UM_ETH_IRQ;
 474
 475         err = update_drop_skb(lp->max_packet);
 476         if (err)
 477                 goto out_undo_user_init;
 478
 479         rtnl_lock();
 480         err = register_netdevice(dev);
 481         rtnl_unlock();
 482         if (err)
 483                 goto out_undo_user_init;
 484
 485         spin_lock(&devices_lock);
 486         list_add(&device->list, &devices);
 487         spin_unlock(&devices_lock);
 488
 489         return;
 490
 491 out_undo_user_init:
 492         if (transport->user->remove != NULL)
 493                 (*transport->user->remove)(&lp->user);
 494 out_unregister:
 495         platform_device_unregister(&device->pdev);
 496         return; /* platform_device_unregister frees dev and device */
 497 out_free_netdev:
 498         free_netdev(dev);
 499 out_free_device:
 500         kfree(device);
 501 }
 502
 503 static struct uml_net *find_device(int n)
 504 {
 505         struct uml_net *device;
 506         struct list_head *ele;
 507
 508         spin_lock(&devices_lock);
 509         list_for_each(ele, &devices) {
 510                 device = list_entry(ele, struct uml_net, list);
 511                 if (device->index == n)
 512                         goto out;
 513         }
 514         device = NULL;
 515  out:
 516         spin_unlock(&devices_lock);
 517         return device;
 518 }
 519
 520 static int eth_parse(char *str, int *index_out, char **str_out,
 521                      char **error_out)
 522 {
 523         char *end;
 524         int n, err = -EINVAL;
 525
 526         n = simple_strtoul(str, &end, 0);
 527         if (end == str) {
 528                 *error_out = "Bad device number";
 529                 return err;
 530         }
 531
 532         str = end;
 533         if (*str != '=') {
 534                 *error_out = "Expected '=' after device number";
 535                 return err;
 536         }
 537
 538         str++;
 539         if (find_device(n)) {
 540                 *error_out = "Device already configured";
 541                 return err;
 542         }
 543
 544         *index_out = n;
 545         *str_out = str;
 546         return 0;
 547 }
 548
 549 struct eth_init {
 550         struct list_head list;
 551         char *init;
 552         int index;
 553 };
 554
 555 static DEFINE_SPINLOCK(transports_lock);
 556 static LIST_HEAD(transports);
 557
 558 /* Filled in during early boot */
 559 static LIST_HEAD(eth_cmd_line);
 560
 561 static int check_transport(struct transport *transport, char *eth, int n,
 562                            void **init_out, char **mac_out, gfp_t gfp_mask)
 563 {
 564         int len;
 565
 566         len = strlen(transport->name);
 567         if (strncmp(eth, transport->name, len))
 568                 return 0;
 569
 570         eth += len;
 571         if (*eth == ',')
 572                 eth++;
 573         else if (*eth != '\0')
 574                 return 0;
 575
 576         *init_out = kmalloc(transport->setup_size, gfp_mask);
 577         if (*init_out == NULL)
 578                 return 1;
 579
 580         if (!transport->setup(eth, mac_out, *init_out)) {
 581                 kfree(*init_out);
 582                 *init_out = NULL;
 583         }
 584         return 1;
 585 }
 586
 587 void register_transport(struct transport *new)
 588 {
 589         struct list_head *ele, *next;
 590         struct eth_init *eth;
 591         void *init;
 592         char *mac = NULL;
 593         int match;
 594
 595         spin_lock(&transports_lock);
 596         BUG_ON(!list_empty(&new->list));
 597         list_add(&new->list, &transports);
 598         spin_unlock(&transports_lock);
 599
 600         list_for_each_safe(ele, next, &eth_cmd_line) {
 601                 eth = list_entry(ele, struct eth_init, list);
 602                 match = check_transport(new, eth->init, eth->index, &init,
 603                                         &mac, GFP_KERNEL);
 604                 if (!match)
 605                         continue;
 606                 else if (init != NULL) {
 607                         eth_configure(eth->index, init, mac, new, GFP_KERNEL);
 608                         kfree(init);
 609                 }
 610                 list_del(&eth->list);
 611         }
 612 }
 613
 614 static int eth_setup_common(char *str, int index)
 615 {
 616         struct list_head *ele;
 617         struct transport *transport;
 618         void *init;
 619         char *mac = NULL;
 620         int found = 0;
 621
 622         spin_lock(&transports_lock);
 623         list_for_each(ele, &transports) {
 624                 transport = list_entry(ele, struct transport, list);
 625                 if (!check_transport(transport, str, index, &init,
 626                                         &mac, GFP_ATOMIC))
 627                         continue;
 628                 if (init != NULL) {
 629                         eth_configure(index, init, mac, transport, GFP_ATOMIC);
 630                         kfree(init);
 631                 }
 632                 found = 1;
 633                 break;
 634         }
 635
 636         spin_unlock(&transports_lock);
 637         return found;
 638 }
 639
 640 static int __init eth_setup(char *str)
 641 {
 642         struct eth_init *new;
 643         char *error;
 644         int n, err;
 645
 646         err = eth_parse(str, &n, &str, &error);
 647         if (err) {
 648                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 649                        str, error);
 650                 return 1;
 651         }
 652
 653         new = alloc_bootmem(sizeof(*new));
 654
 655         INIT_LIST_HEAD(&new->list);
 656         new->index = n;
 657         new->init = str;
 658
 659         list_add_tail(&new->list, &eth_cmd_line);
 660         return 1;
 661 }
 662
 663 __setup("eth", eth_setup);
 664 __uml_help(eth_setup,
 665 "eth[0-9]+=<transport>,<options>\n"
 666 "    Configure a network device.\n\n"
 667 );
 668
 669 static int net_config(char *str, char **error_out)
 670 {
 671         int n, err;
 672
 673         err = eth_parse(str, &n, &str, error_out);
 674         if (err)
 675                 return err;
 676
 677         /* This string is broken up and the pieces used by the underlying
 678          * driver.  So, it is freed only if eth_setup_common fails.
 679          */
 680         str = kstrdup(str, GFP_KERNEL);
 681         if (str == NULL) {
 682                 *error_out = "net_config failed to strdup string";
 683                 return -ENOMEM;
 684         }
 685         err = !eth_setup_common(str, n);
 686         if (err)
 687                 kfree(str);
 688         return err;
 689 }
 690
 691 static int net_id(char **str, int *start_out, int *end_out)
 692 {
 693         char *end;
 694         int n;
 695
 696         n = simple_strtoul(*str, &end, 0);
 697         if ((*end != '\0') || (end == *str))
 698                 return -1;
 699
 700         *start_out = n;
 701         *end_out = n;
 702         *str = end;
 703         return n;
 704 }
 705
 706 static int net_remove(int n, char **error_out)
 707 {
 708         struct uml_net *device;
 709         struct net_device *dev;
 710         struct uml_net_private *lp;
 711
 712         device = find_device(n);
 713         if (device == NULL)
 714                 return -ENODEV;
 715
 716         dev = device->dev;
 717         lp = netdev_priv(dev);
 718         if (lp->fd > 0)
 719                 return -EBUSY;
 720         unregister_netdev(dev);
 721         platform_device_unregister(&device->pdev);
 722
 723         return 0;
 724 }
 725
 726 static struct mc_device net_mc = {
 727         .list           = LIST_HEAD_INIT(net_mc.list),
 728         .name           = "eth",
 729         .config         = net_config,
 730         .get_config     = NULL,
 731         .id             = net_id,
 732         .remove         = net_remove,
 733 };
 734
 735 #ifdef CONFIG_INET
 736 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 737                               void *ptr)
 738 {
 739         struct in_ifaddr *ifa = ptr;
 740         struct net_device *dev = ifa->ifa_dev->dev;
 741         struct uml_net_private *lp;
 742         void (*proc)(unsigned char *, unsigned char *, void *);
 743         unsigned char addr_buf[4], netmask_buf[4];
 744
 745         if (dev->netdev_ops->ndo_open != uml_net_open)
 746                 return NOTIFY_DONE;
 747
 748         lp = netdev_priv(dev);
 749
 750         proc = NULL;
 751         switch (event) {
 752         case NETDEV_UP:
 753                 proc = lp->add_address;
 754                 break;
 755         case NETDEV_DOWN:
 756                 proc = lp->delete_address;
 757                 break;
 758         }
 759         if (proc != NULL) {
 760                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 761                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 762                 (*proc)(addr_buf, netmask_buf, &lp->user);
 763         }
 764         return NOTIFY_DONE;
 765 }
 766
 767 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 768 static struct notifier_block uml_inetaddr_notifier = {
 769         .notifier_call          = uml_inetaddr_event,
 770 };
 771
 772 static void inet_register(void)
 773 {
 774         struct list_head *ele;
 775         struct uml_net_private *lp;
 776         struct in_device *ip;
 777         struct in_ifaddr *in;
 778
 779         register_inetaddr_notifier(&uml_inetaddr_notifier);
 780
 781         /* Devices may have been opened already, so the uml_inetaddr_notifier
 782          * didn't get a chance to run for them.  This fakes it so that
 783          * addresses which have already been set up get handled properly.
 784          */
 785         spin_lock(&opened_lock);
 786         list_for_each(ele, &opened) {
 787                 lp = list_entry(ele, struct uml_net_private, list);
 788                 ip = lp->dev->ip_ptr;
 789                 if (ip == NULL)
 790                         continue;
 791                 in = ip->ifa_list;
 792                 while (in != NULL) {
 793                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 794                         in = in->ifa_next;
 795                 }
 796         }
 797         spin_unlock(&opened_lock);
 798 }
 799 #else
 800 static inline void inet_register(void)
 801 {
 802 }
 803 #endif
 804
 805 static int uml_net_init(void)
 806 {
 807         mconsole_register_dev(&net_mc);
 808         inet_register();
 809         return 0;
 810 }
 811
 812 __initcall(uml_net_init);
 813
 814 static void close_devices(void)
 815 {
 816         struct list_head *ele;
 817         struct uml_net_private *lp;
 818
 819         spin_lock(&opened_lock);
 820         list_for_each(ele, &opened) {
 821                 lp = list_entry(ele, struct uml_net_private, list);
 822                 um_free_irq(lp->dev->irq, lp->dev);
 823                 if ((lp->close != NULL) && (lp->fd >= 0))
 824                         (*lp->close)(lp->fd, &lp->user);
 825                 if (lp->remove != NULL)
 826                         (*lp->remove)(&lp->user);
 827         }
 828         spin_unlock(&opened_lock);
 829 }
 830
 831 __uml_exitcall(close_devices);
 832
 833 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 834                                         void *),
 835                     void *arg)
 836 {
 837         struct net_device *dev = d;
 838         struct in_device *ip = dev->ip_ptr;
 839         struct in_ifaddr *in;
 840         unsigned char address[4], netmask[4];
 841
 842         if (ip == NULL) return;
 843         in = ip->ifa_list;
 844         while (in != NULL) {
 845                 memcpy(address, &in->ifa_address, sizeof(address));
 846                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 847                 (*cb)(address, netmask, arg);
 848                 in = in->ifa_next;
 849         }
 850 }
 851
 852 int dev_netmask(void *d, void *m)
 853 {
 854         struct net_device *dev = d;
 855         struct in_device *ip = dev->ip_ptr;
 856         struct in_ifaddr *in;
 857         __be32 *mask_out = m;
 858
 859         if (ip == NULL)
 860                 return 1;
 861
 862         in = ip->ifa_list;
 863         if (in == NULL)
 864                 return 1;
 865
 866         *mask_out = in->ifa_mask;
 867         return 0;
 868 }
 869
 870 void *get_output_buffer(int *len_out)
 871 {
 872         void *ret;
 873
 874         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 875         if (ret) *len_out = PAGE_SIZE;
 876         else *len_out = 0;
 877         return ret;
 878 }
 879
 880 void free_output_buffer(void *buffer)
 881 {
 882         free_pages((unsigned long) buffer, 0);
 883 }
 884
 885 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 886                      char **gate_addr)
 887 {
 888         char *remain;
 889
 890         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 891         if (remain != NULL) {
 892                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 893                        "specification : '%s'\n", remain);
 894                 return 1;
 895         }
 896
 897         return 0;
 898 }
 899
 900 unsigned short eth_protocol(struct sk_buff *skb)
 901 {
 902         return eth_type_trans(skb, skb->dev);
 903 }