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

   1 /*
   2  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   4  * James Leu (jleu@mindspring.net).
   5  * Copyright (C) 2001 by various other people who didn't put their name here.
   6  * Licensed under the GPL.
   7  */
   8
   9 #include <linux/bootmem.h>
  10 #include <linux/etherdevice.h>
  11 #include <linux/ethtool.h>
  12 #include <linux/inetdevice.h>
  13 #include <linux/init.h>
  14 #include <linux/list.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/spinlock.h>
  20 #include "init.h"
  21 #include "irq_kern.h"
  22 #include "irq_user.h"
  23 #include "mconsole_kern.h"
  24 #include "net_kern.h"
  25 #include "net_user.h"
  26
  27 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
  28 {
  29         memcpy(dev->dev_addr, addr, ETH_ALEN);
  30 }
  31
  32 #define DRIVER_NAME "uml-netdev"
  33
  34 static DEFINE_SPINLOCK(opened_lock);
  35 static LIST_HEAD(opened);
  36
  37 /*
  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                 dev->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                 dev->stats.rx_bytes += skb->len;
 103                 dev->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                 dev->stats.tx_packets++;
 228                 dev->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                 dev->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 void uml_net_set_multicast_list(struct net_device *dev)
 252 {
 253         return;
 254 }
 255
 256 static void uml_net_tx_timeout(struct net_device *dev)
 257 {
 258         dev->trans_start = jiffies;
 259         netif_wake_queue(dev);
 260 }
 261
 262 static int uml_net_set_mac(struct net_device *dev, void *addr)
 263 {
 264         struct uml_net_private *lp = netdev_priv(dev);
 265         struct sockaddr *hwaddr = addr;
 266
 267         spin_lock_irq(&lp->lock);
 268         set_ether_mac(dev, hwaddr->sa_data);
 269         spin_unlock_irq(&lp->lock);
 270
 271         return 0;
 272 }
 273
 274 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 275 {
 276         dev->mtu = new_mtu;
 277
 278         return 0;
 279 }
 280
 281 static void uml_net_get_drvinfo(struct net_device *dev,
 282                                 struct ethtool_drvinfo *info)
 283 {
 284         strcpy(info->driver, DRIVER_NAME);
 285         strcpy(info->version, "42");
 286 }
 287
 288 static struct ethtool_ops uml_net_ethtool_ops = {
 289         .get_drvinfo    = uml_net_get_drvinfo,
 290         .get_link       = ethtool_op_get_link,
 291 };
 292
 293 static void uml_net_user_timer_expire(unsigned long _conn)
 294 {
 295 #ifdef undef
 296         struct connection *conn = (struct connection *)_conn;
 297
 298         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 299         do_connect(conn);
 300 #endif
 301 }
 302
 303 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
 304 {
 305         char *end;
 306         int i;
 307
 308         if (str == NULL)
 309                 goto random;
 310
 311         for (i = 0; i < 6; i++) {
 312                 addr[i] = simple_strtoul(str, &end, 16);
 313                 if ((end == str) ||
 314                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 315                         printk(KERN_ERR
 316                                "setup_etheraddr: failed to parse '%s' "
 317                                "as an ethernet address\n", str);
 318                         goto random;
 319                 }
 320                 str = end + 1;
 321         }
 322         if (is_multicast_ether_addr(addr)) {
 323                 printk(KERN_ERR
 324                        "Attempt to assign a multicast ethernet address to a "
 325                        "device disallowed\n");
 326                 goto random;
 327         }
 328         if (!is_valid_ether_addr(addr)) {
 329                 printk(KERN_ERR
 330                        "Attempt to assign an invalid ethernet address to a "
 331                        "device disallowed\n");
 332                 goto random;
 333         }
 334         if (!is_local_ether_addr(addr)) {
 335                 printk(KERN_WARNING
 336                        "Warning: Assigning a globally valid ethernet "
 337                        "address to a device\n");
 338                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 339                        "the first byte of the MAC,\n");
 340                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 341                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 342                        addr[5]);
 343         }
 344         return;
 345
 346 random:
 347         printk(KERN_INFO
 348                "Choosing a random ethernet address for device %s\n", name);
 349         random_ether_addr(addr);
 350 }
 351
 352 static DEFINE_SPINLOCK(devices_lock);
 353 static LIST_HEAD(devices);
 354
 355 static struct platform_driver uml_net_driver = {
 356         .driver = {
 357                 .name  = DRIVER_NAME,
 358         },
 359 };
 360
 361 static void net_device_release(struct device *dev)
 362 {
 363         struct uml_net *device = dev->driver_data;
 364         struct net_device *netdev = device->dev;
 365         struct uml_net_private *lp = netdev_priv(netdev);
 366
 367         if (lp->remove != NULL)
 368                 (*lp->remove)(&lp->user);
 369         list_del(&device->list);
 370         kfree(device);
 371         free_netdev(netdev);
 372 }
 373
 374 /*
 375  * Ensures that platform_driver_register is called only once by
 376  * eth_configure.  Will be set in an initcall.
 377  */
 378 static int driver_registered;
 379
 380 static void eth_configure(int n, void *init, char *mac,
 381                           struct transport *transport)
 382 {
 383         struct uml_net *device;
 384         struct net_device *dev;
 385         struct uml_net_private *lp;
 386         int err, size;
 387
 388         size = transport->private_size + sizeof(struct uml_net_private);
 389
 390         device = kzalloc(sizeof(*device), GFP_KERNEL);
 391         if (device == NULL) {
 392                 printk(KERN_ERR "eth_configure failed to allocate struct "
 393                        "uml_net\n");
 394                 return;
 395         }
 396
 397         dev = alloc_etherdev(size);
 398         if (dev == NULL) {
 399                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 400                        "net_device for eth%d\n", n);
 401                 goto out_free_device;
 402         }
 403
 404         INIT_LIST_HEAD(&device->list);
 405         device->index = n;
 406
 407         /* If this name ends up conflicting with an existing registered
 408          * netdevice, that is OK, register_netdev{,ice}() will notice this
 409          * and fail.
 410          */
 411         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 412
 413         setup_etheraddr(mac, device->mac, dev->name);
 414
 415         printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac);
 416
 417         lp = netdev_priv(dev);
 418         /* This points to the transport private data. It's still clear, but we
 419          * must memset it to 0 *now*. Let's help the drivers. */
 420         memset(lp, 0, size);
 421         INIT_WORK(&lp->work, uml_dev_close);
 422
 423         /* sysfs register */
 424         if (!driver_registered) {
 425                 platform_driver_register(&uml_net_driver);
 426                 driver_registered = 1;
 427         }
 428         device->pdev.id = n;
 429         device->pdev.name = DRIVER_NAME;
 430         device->pdev.dev.release = net_device_release;
 431         device->pdev.dev.driver_data = device;
 432         if (platform_device_register(&device->pdev))
 433                 goto out_free_netdev;
 434         SET_NETDEV_DEV(dev,&device->pdev.dev);
 435
 436         device->dev = dev;
 437
 438         /*
 439          * These just fill in a data structure, so there's no failure
 440          * to be worried about.
 441          */
 442         (*transport->kern->init)(dev, init);
 443
 444         *lp = ((struct uml_net_private)
 445                 { .list                 = LIST_HEAD_INIT(lp->list),
 446                   .dev                  = dev,
 447                   .fd                   = -1,
 448                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 449                   .max_packet           = transport->user->max_packet,
 450                   .protocol             = transport->kern->protocol,
 451                   .open                 = transport->user->open,
 452                   .close                = transport->user->close,
 453                   .remove               = transport->user->remove,
 454                   .read                 = transport->kern->read,
 455                   .write                = transport->kern->write,
 456                   .add_address          = transport->user->add_address,
 457                   .delete_address       = transport->user->delete_address });
 458
 459         init_timer(&lp->tl);
 460         spin_lock_init(&lp->lock);
 461         lp->tl.function = uml_net_user_timer_expire;
 462         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 463
 464         if ((transport->user->init != NULL) &&
 465             ((*transport->user->init)(&lp->user, dev) != 0))
 466                 goto out_unregister;
 467
 468         set_ether_mac(dev, device->mac);
 469         dev->mtu = transport->user->mtu;
 470         dev->open = uml_net_open;
 471         dev->hard_start_xmit = uml_net_start_xmit;
 472         dev->stop = uml_net_close;
 473         dev->set_multicast_list = uml_net_set_multicast_list;
 474         dev->tx_timeout = uml_net_tx_timeout;
 475         dev->set_mac_address = uml_net_set_mac;
 476         dev->change_mtu = uml_net_change_mtu;
 477         dev->ethtool_ops = &uml_net_ethtool_ops;
 478         dev->watchdog_timeo = (HZ >> 1);
 479         dev->irq = UM_ETH_IRQ;
 480
 481         err = update_drop_skb(lp->max_packet);
 482         if (err)
 483                 goto out_undo_user_init;
 484
 485         rtnl_lock();
 486         err = register_netdevice(dev);
 487         rtnl_unlock();
 488         if (err)
 489                 goto out_undo_user_init;
 490
 491         spin_lock(&devices_lock);
 492         list_add(&device->list, &devices);
 493         spin_unlock(&devices_lock);
 494
 495         return;
 496
 497 out_undo_user_init:
 498         if (transport->user->remove != NULL)
 499                 (*transport->user->remove)(&lp->user);
 500 out_unregister:
 501         platform_device_unregister(&device->pdev);
 502         return; /* platform_device_unregister frees dev and device */
 503 out_free_netdev:
 504         free_netdev(dev);
 505 out_free_device:
 506         kfree(device);
 507 }
 508
 509 static struct uml_net *find_device(int n)
 510 {
 511         struct uml_net *device;
 512         struct list_head *ele;
 513
 514         spin_lock(&devices_lock);
 515         list_for_each(ele, &devices) {
 516                 device = list_entry(ele, struct uml_net, list);
 517                 if (device->index == n)
 518                         goto out;
 519         }
 520         device = NULL;
 521  out:
 522         spin_unlock(&devices_lock);
 523         return device;
 524 }
 525
 526 static int eth_parse(char *str, int *index_out, char **str_out,
 527                      char **error_out)
 528 {
 529         char *end;
 530         int n, err = -EINVAL;;
 531
 532         n = simple_strtoul(str, &end, 0);
 533         if (end == str) {
 534                 *error_out = "Bad device number";
 535                 return err;
 536         }
 537
 538         str = end;
 539         if (*str != '=') {
 540                 *error_out = "Expected '=' after device number";
 541                 return err;
 542         }
 543
 544         str++;
 545         if (find_device(n)) {
 546                 *error_out = "Device already configured";
 547                 return err;
 548         }
 549
 550         *index_out = n;
 551         *str_out = str;
 552         return 0;
 553 }
 554
 555 struct eth_init {
 556         struct list_head list;
 557         char *init;
 558         int index;
 559 };
 560
 561 static DEFINE_SPINLOCK(transports_lock);
 562 static LIST_HEAD(transports);
 563
 564 /* Filled in during early boot */
 565 static LIST_HEAD(eth_cmd_line);
 566
 567 static int check_transport(struct transport *transport, char *eth, int n,
 568                            void **init_out, char **mac_out)
 569 {
 570         int len;
 571
 572         len = strlen(transport->name);
 573         if (strncmp(eth, transport->name, len))
 574                 return 0;
 575
 576         eth += len;
 577         if (*eth == ',')
 578                 eth++;
 579         else if (*eth != '\0')
 580                 return 0;
 581
 582         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 583         if (*init_out == NULL)
 584                 return 1;
 585
 586         if (!transport->setup(eth, mac_out, *init_out)) {
 587                 kfree(*init_out);
 588                 *init_out = NULL;
 589         }
 590         return 1;
 591 }
 592
 593 void register_transport(struct transport *new)
 594 {
 595         struct list_head *ele, *next;
 596         struct eth_init *eth;
 597         void *init;
 598         char *mac = NULL;
 599         int match;
 600
 601         spin_lock(&transports_lock);
 602         BUG_ON(!list_empty(&new->list));
 603         list_add(&new->list, &transports);
 604         spin_unlock(&transports_lock);
 605
 606         list_for_each_safe(ele, next, &eth_cmd_line) {
 607                 eth = list_entry(ele, struct eth_init, list);
 608                 match = check_transport(new, eth->init, eth->index, &init,
 609                                         &mac);
 610                 if (!match)
 611                         continue;
 612                 else if (init != NULL) {
 613                         eth_configure(eth->index, init, mac, new);
 614                         kfree(init);
 615                 }
 616                 list_del(&eth->list);
 617         }
 618 }
 619
 620 static int eth_setup_common(char *str, int index)
 621 {
 622         struct list_head *ele;
 623         struct transport *transport;
 624         void *init;
 625         char *mac = NULL;
 626         int found = 0;
 627
 628         spin_lock(&transports_lock);
 629         list_for_each(ele, &transports) {
 630                 transport = list_entry(ele, struct transport, list);
 631                 if (!check_transport(transport, str, index, &init, &mac))
 632                         continue;
 633                 if (init != NULL) {
 634                         eth_configure(index, init, mac, transport);
 635                         kfree(init);
 636                 }
 637                 found = 1;
 638                 break;
 639         }
 640
 641         spin_unlock(&transports_lock);
 642         return found;
 643 }
 644
 645 static int __init eth_setup(char *str)
 646 {
 647         struct eth_init *new;
 648         char *error;
 649         int n, err;
 650
 651         err = eth_parse(str, &n, &str, &error);
 652         if (err) {
 653                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 654                        str, error);
 655                 return 1;
 656         }
 657
 658         new = alloc_bootmem(sizeof(*new));
 659         if (new == NULL) {
 660                 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
 661                 return 1;
 662         }
 663
 664         INIT_LIST_HEAD(&new->list);
 665         new->index = n;
 666         new->init = str;
 667
 668         list_add_tail(&new->list, &eth_cmd_line);
 669         return 1;
 670 }
 671
 672 __setup("eth", eth_setup);
 673 __uml_help(eth_setup,
 674 "eth[0-9]+=<transport>,<options>\n"
 675 "    Configure a network device.\n\n"
 676 );
 677
 678 static int net_config(char *str, char **error_out)
 679 {
 680         int n, err;
 681
 682         err = eth_parse(str, &n, &str, error_out);
 683         if (err)
 684                 return err;
 685
 686         /* This string is broken up and the pieces used by the underlying
 687          * driver.  So, it is freed only if eth_setup_common fails.
 688          */
 689         str = kstrdup(str, GFP_KERNEL);
 690         if (str == NULL) {
 691                 *error_out = "net_config failed to strdup string";
 692                 return -ENOMEM;
 693         }
 694         err = !eth_setup_common(str, n);
 695         if (err)
 696                 kfree(str);
 697         return err;
 698 }
 699
 700 static int net_id(char **str, int *start_out, int *end_out)
 701 {
 702         char *end;
 703         int n;
 704
 705         n = simple_strtoul(*str, &end, 0);
 706         if ((*end != '\0') || (end == *str))
 707                 return -1;
 708
 709         *start_out = n;
 710         *end_out = n;
 711         *str = end;
 712         return n;
 713 }
 714
 715 static int net_remove(int n, char **error_out)
 716 {
 717         struct uml_net *device;
 718         struct net_device *dev;
 719         struct uml_net_private *lp;
 720
 721         device = find_device(n);
 722         if (device == NULL)
 723                 return -ENODEV;
 724
 725         dev = device->dev;
 726         lp = netdev_priv(dev);
 727         if (lp->fd > 0)
 728                 return -EBUSY;
 729         unregister_netdev(dev);
 730         platform_device_unregister(&device->pdev);
 731
 732         return 0;
 733 }
 734
 735 static struct mc_device net_mc = {
 736         .list           = LIST_HEAD_INIT(net_mc.list),
 737         .name           = "eth",
 738         .config         = net_config,
 739         .get_config     = NULL,
 740         .id             = net_id,
 741         .remove         = net_remove,
 742 };
 743
 744 #ifdef CONFIG_INET
 745 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 746                               void *ptr)
 747 {
 748         struct in_ifaddr *ifa = ptr;
 749         struct net_device *dev = ifa->ifa_dev->dev;
 750         struct uml_net_private *lp;
 751         void (*proc)(unsigned char *, unsigned char *, void *);
 752         unsigned char addr_buf[4], netmask_buf[4];
 753
 754         if (dev->open != uml_net_open)
 755                 return NOTIFY_DONE;
 756
 757         lp = netdev_priv(dev);
 758
 759         proc = NULL;
 760         switch (event) {
 761         case NETDEV_UP:
 762                 proc = lp->add_address;
 763                 break;
 764         case NETDEV_DOWN:
 765                 proc = lp->delete_address;
 766                 break;
 767         }
 768         if (proc != NULL) {
 769                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 770                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 771                 (*proc)(addr_buf, netmask_buf, &lp->user);
 772         }
 773         return NOTIFY_DONE;
 774 }
 775
 776 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 777 static struct notifier_block uml_inetaddr_notifier = {
 778         .notifier_call          = uml_inetaddr_event,
 779 };
 780
 781 static void inet_register(void)
 782 {
 783         struct list_head *ele;
 784         struct uml_net_private *lp;
 785         struct in_device *ip;
 786         struct in_ifaddr *in;
 787
 788         register_inetaddr_notifier(&uml_inetaddr_notifier);
 789
 790         /* Devices may have been opened already, so the uml_inetaddr_notifier
 791          * didn't get a chance to run for them.  This fakes it so that
 792          * addresses which have already been set up get handled properly.
 793          */
 794         spin_lock(&opened_lock);
 795         list_for_each(ele, &opened) {
 796                 lp = list_entry(ele, struct uml_net_private, list);
 797                 ip = lp->dev->ip_ptr;
 798                 if (ip == NULL)
 799                         continue;
 800                 in = ip->ifa_list;
 801                 while (in != NULL) {
 802                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 803                         in = in->ifa_next;
 804                 }
 805         }
 806         spin_unlock(&opened_lock);
 807 }
 808 #else
 809 static inline void inet_register(void)
 810 {
 811 }
 812 #endif
 813
 814 static int uml_net_init(void)
 815 {
 816         mconsole_register_dev(&net_mc);
 817         inet_register();
 818         return 0;
 819 }
 820
 821 __initcall(uml_net_init);
 822
 823 static void close_devices(void)
 824 {
 825         struct list_head *ele;
 826         struct uml_net_private *lp;
 827
 828         spin_lock(&opened_lock);
 829         list_for_each(ele, &opened) {
 830                 lp = list_entry(ele, struct uml_net_private, list);
 831                 free_irq(lp->dev->irq, lp->dev);
 832                 if ((lp->close != NULL) && (lp->fd >= 0))
 833                         (*lp->close)(lp->fd, &lp->user);
 834                 if (lp->remove != NULL)
 835                         (*lp->remove)(&lp->user);
 836         }
 837         spin_unlock(&opened_lock);
 838 }
 839
 840 __uml_exitcall(close_devices);
 841
 842 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 843                                         void *),
 844                     void *arg)
 845 {
 846         struct net_device *dev = d;
 847         struct in_device *ip = dev->ip_ptr;
 848         struct in_ifaddr *in;
 849         unsigned char address[4], netmask[4];
 850
 851         if (ip == NULL) return;
 852         in = ip->ifa_list;
 853         while (in != NULL) {
 854                 memcpy(address, &in->ifa_address, sizeof(address));
 855                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 856                 (*cb)(address, netmask, arg);
 857                 in = in->ifa_next;
 858         }
 859 }
 860
 861 int dev_netmask(void *d, void *m)
 862 {
 863         struct net_device *dev = d;
 864         struct in_device *ip = dev->ip_ptr;
 865         struct in_ifaddr *in;
 866         __be32 *mask_out = m;
 867
 868         if (ip == NULL)
 869                 return 1;
 870
 871         in = ip->ifa_list;
 872         if (in == NULL)
 873                 return 1;
 874
 875         *mask_out = in->ifa_mask;
 876         return 0;
 877 }
 878
 879 void *get_output_buffer(int *len_out)
 880 {
 881         void *ret;
 882
 883         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 884         if (ret) *len_out = PAGE_SIZE;
 885         else *len_out = 0;
 886         return ret;
 887 }
 888
 889 void free_output_buffer(void *buffer)
 890 {
 891         free_pages((unsigned long) buffer, 0);
 892 }
 893
 894 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 895                      char **gate_addr)
 896 {
 897         char *remain;
 898
 899         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 900         if (remain != NULL) {
 901                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 902                        "specification : '%s'\n", remain);
 903                 return 1;
 904         }
 905
 906         return 0;
 907 }
 908
 909 unsigned short eth_protocol(struct sk_buff *skb)
 910 {
 911         return eth_type_trans(skb, skb->dev);
 912 }