git.oblomov.eu Git - 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 = dev->priv;
  80         int pkt_len;
  81         struct sk_buff *skb;
  82
  83         /* If we can't allocate memory, try again next round. */
  84         skb = dev_alloc_skb(lp->max_packet);
  85         if (skb == NULL) {
  86                 drop_skb->dev = dev;
  87                 /* Read a packet into drop_skb and don't do anything with it. */
  88                 (*lp->read)(lp->fd, drop_skb, lp);
  89                 lp->stats.rx_dropped++;
  90                 return 0;
  91         }
  92
  93         skb->dev = dev;
  94         skb_put(skb, lp->max_packet);
  95         skb_reset_mac_header(skb);
  96         pkt_len = (*lp->read)(lp->fd, skb, lp);
  97
  98         if (pkt_len > 0) {
  99                 skb_trim(skb, pkt_len);
 100                 skb->protocol = (*lp->protocol)(skb);
 101
 102                 lp->stats.rx_bytes += skb->len;
 103                 lp->stats.rx_packets++;
 104                 netif_rx(skb);
 105                 return pkt_len;
 106         }
 107
 108         kfree_skb(skb);
 109         return pkt_len;
 110 }
 111
 112 static void uml_dev_close(struct work_struct *work)
 113 {
 114         struct uml_net_private *lp =
 115                 container_of(work, struct uml_net_private, work);
 116         dev_close(lp->dev);
 117 }
 118
 119 static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
 120 {
 121         struct net_device *dev = dev_id;
 122         struct uml_net_private *lp = dev->priv;
 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 = dev->priv;
 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 = dev->priv;
 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 = dev->priv;
 217         unsigned long flags;
 218         int len;
 219
 220         netif_stop_queue(dev);
 221
 222         spin_lock_irqsave(&lp->lock, flags);
 223
 224         len = (*lp->write)(lp->fd, skb, lp);
 225
 226         if (len == skb->len) {
 227                 lp->stats.tx_packets++;
 228                 lp->stats.tx_bytes += skb->len;
 229                 dev->trans_start = jiffies;
 230                 netif_start_queue(dev);
 231
 232                 /* this is normally done in the interrupt when tx finishes */
 233                 netif_wake_queue(dev);
 234         }
 235         else if (len == 0) {
 236                 netif_start_queue(dev);
 237                 lp->stats.tx_dropped++;
 238         }
 239         else {
 240                 netif_start_queue(dev);
 241                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 242         }
 243
 244         spin_unlock_irqrestore(&lp->lock, flags);
 245
 246         dev_kfree_skb(skb);
 247
 248         return 0;
 249 }
 250
 251 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 252 {
 253         struct uml_net_private *lp = dev->priv;
 254         return &lp->stats;
 255 }
 256
 257 static void uml_net_set_multicast_list(struct net_device *dev)
 258 {
 259         return;
 260 }
 261
 262 static void uml_net_tx_timeout(struct net_device *dev)
 263 {
 264         dev->trans_start = jiffies;
 265         netif_wake_queue(dev);
 266 }
 267
 268 static int uml_net_set_mac(struct net_device *dev, void *addr)
 269 {
 270         struct uml_net_private *lp = dev->priv;
 271         struct sockaddr *hwaddr = addr;
 272
 273         spin_lock_irq(&lp->lock);
 274         set_ether_mac(dev, hwaddr->sa_data);
 275         spin_unlock_irq(&lp->lock);
 276
 277         return 0;
 278 }
 279
 280 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 281 {
 282         dev->mtu = new_mtu;
 283
 284         return 0;
 285 }
 286
 287 static void uml_net_get_drvinfo(struct net_device *dev,
 288                                 struct ethtool_drvinfo *info)
 289 {
 290         strcpy(info->driver, DRIVER_NAME);
 291         strcpy(info->version, "42");
 292 }
 293
 294 static struct ethtool_ops uml_net_ethtool_ops = {
 295         .get_drvinfo    = uml_net_get_drvinfo,
 296         .get_link       = ethtool_op_get_link,
 297 };
 298
 299 static void uml_net_user_timer_expire(unsigned long _conn)
 300 {
 301 #ifdef undef
 302         struct connection *conn = (struct connection *)_conn;
 303
 304         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 305         do_connect(conn);
 306 #endif
 307 }
 308
 309 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
 310 {
 311         char *end;
 312         int i;
 313
 314         if (str == NULL)
 315                 goto random;
 316
 317         for (i = 0; i < 6; i++) {
 318                 addr[i] = simple_strtoul(str, &end, 16);
 319                 if ((end == str) ||
 320                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 321                         printk(KERN_ERR
 322                                "setup_etheraddr: failed to parse '%s' "
 323                                "as an ethernet address\n", str);
 324                         goto random;
 325                 }
 326                 str = end + 1;
 327         }
 328         if (is_multicast_ether_addr(addr)) {
 329                 printk(KERN_ERR
 330                        "Attempt to assign a multicast ethernet address to a "
 331                        "device disallowed\n");
 332                 goto random;
 333         }
 334         if (!is_valid_ether_addr(addr)) {
 335                 printk(KERN_ERR
 336                        "Attempt to assign an invalid ethernet address to a "
 337                        "device disallowed\n");
 338                 goto random;
 339         }
 340         if (!is_local_ether_addr(addr)) {
 341                 printk(KERN_WARNING
 342                        "Warning: Assigning a globally valid ethernet "
 343                        "address to a device\n");
 344                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 345                        "the first byte of the MAC,\n");
 346                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 347                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 348                        addr[5]);
 349         }
 350         return;
 351
 352 random:
 353         printk(KERN_INFO
 354                "Choosing a random ethernet address for device %s\n", name);
 355         random_ether_addr(addr);
 356 }
 357
 358 static DEFINE_SPINLOCK(devices_lock);
 359 static LIST_HEAD(devices);
 360
 361 static struct platform_driver uml_net_driver = {
 362         .driver = {
 363                 .name  = DRIVER_NAME,
 364         },
 365 };
 366
 367 static void net_device_release(struct device *dev)
 368 {
 369         struct uml_net *device = dev->driver_data;
 370         struct net_device *netdev = device->dev;
 371         struct uml_net_private *lp = netdev->priv;
 372
 373         if (lp->remove != NULL)
 374                 (*lp->remove)(&lp->user);
 375         list_del(&device->list);
 376         kfree(device);
 377         free_netdev(netdev);
 378 }
 379
 380 /*
 381  * Ensures that platform_driver_register is called only once by
 382  * eth_configure.  Will be set in an initcall.
 383  */
 384 static int driver_registered;
 385
 386 static void eth_configure(int n, void *init, char *mac,
 387                           struct transport *transport)
 388 {
 389         struct uml_net *device;
 390         struct net_device *dev;
 391         struct uml_net_private *lp;
 392         int err, size;
 393
 394         size = transport->private_size + sizeof(struct uml_net_private);
 395
 396         device = kzalloc(sizeof(*device), GFP_KERNEL);
 397         if (device == NULL) {
 398                 printk(KERN_ERR "eth_configure failed to allocate struct "
 399                        "uml_net\n");
 400                 return;
 401         }
 402
 403         dev = alloc_etherdev(size);
 404         if (dev == NULL) {
 405                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 406                        "net_device for eth%d\n", n);
 407                 goto out_free_device;
 408         }
 409
 410         INIT_LIST_HEAD(&device->list);
 411         device->index = n;
 412
 413         /* If this name ends up conflicting with an existing registered
 414          * netdevice, that is OK, register_netdev{,ice}() will notice this
 415          * and fail.
 416          */
 417         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 418
 419         setup_etheraddr(mac, device->mac, dev->name);
 420
 421         printk(KERN_INFO "Netdevice %d ", n);
 422         printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 423                device->mac[0], device->mac[1],
 424                device->mac[2], device->mac[3],
 425                device->mac[4], device->mac[5]);
 426         printk(": ");
 427
 428         lp = dev->priv;
 429         /* This points to the transport private data. It's still clear, but we
 430          * must memset it to 0 *now*. Let's help the drivers. */
 431         memset(lp, 0, size);
 432         INIT_WORK(&lp->work, uml_dev_close);
 433
 434         /* sysfs register */
 435         if (!driver_registered) {
 436                 platform_driver_register(&uml_net_driver);
 437                 driver_registered = 1;
 438         }
 439         device->pdev.id = n;
 440         device->pdev.name = DRIVER_NAME;
 441         device->pdev.dev.release = net_device_release;
 442         device->pdev.dev.driver_data = device;
 443         if (platform_device_register(&device->pdev))
 444                 goto out_free_netdev;
 445         SET_NETDEV_DEV(dev,&device->pdev.dev);
 446
 447         device->dev = dev;
 448
 449         /*
 450          * These just fill in a data structure, so there's no failure
 451          * to be worried about.
 452          */
 453         (*transport->kern->init)(dev, init);
 454
 455         *lp = ((struct uml_net_private)
 456                 { .list                 = LIST_HEAD_INIT(lp->list),
 457                   .dev                  = dev,
 458                   .fd                   = -1,
 459                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 460                   .max_packet           = transport->user->max_packet,
 461                   .protocol             = transport->kern->protocol,
 462                   .open                 = transport->user->open,
 463                   .close                = transport->user->close,
 464                   .remove               = transport->user->remove,
 465                   .read                 = transport->kern->read,
 466                   .write                = transport->kern->write,
 467                   .add_address          = transport->user->add_address,
 468                   .delete_address       = transport->user->delete_address });
 469
 470         init_timer(&lp->tl);
 471         spin_lock_init(&lp->lock);
 472         lp->tl.function = uml_net_user_timer_expire;
 473         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 474
 475         if ((transport->user->init != NULL) &&
 476             ((*transport->user->init)(&lp->user, dev) != 0))
 477                 goto out_unregister;
 478
 479         set_ether_mac(dev, device->mac);
 480         dev->mtu = transport->user->mtu;
 481         dev->open = uml_net_open;
 482         dev->hard_start_xmit = uml_net_start_xmit;
 483         dev->stop = uml_net_close;
 484         dev->get_stats = uml_net_get_stats;
 485         dev->set_multicast_list = uml_net_set_multicast_list;
 486         dev->tx_timeout = uml_net_tx_timeout;
 487         dev->set_mac_address = uml_net_set_mac;
 488         dev->change_mtu = uml_net_change_mtu;
 489         dev->ethtool_ops = &uml_net_ethtool_ops;
 490         dev->watchdog_timeo = (HZ >> 1);
 491         dev->irq = UM_ETH_IRQ;
 492
 493         err = update_drop_skb(lp->max_packet);
 494         if (err)
 495                 goto out_undo_user_init;
 496
 497         rtnl_lock();
 498         err = register_netdevice(dev);
 499         rtnl_unlock();
 500         if (err)
 501                 goto out_undo_user_init;
 502
 503         spin_lock(&devices_lock);
 504         list_add(&device->list, &devices);
 505         spin_unlock(&devices_lock);
 506
 507         return;
 508
 509 out_undo_user_init:
 510         if (transport->user->remove != NULL)
 511                 (*transport->user->remove)(&lp->user);
 512 out_unregister:
 513         platform_device_unregister(&device->pdev);
 514         return; /* platform_device_unregister frees dev and device */
 515 out_free_netdev:
 516         free_netdev(dev);
 517 out_free_device:
 518         kfree(device);
 519 }
 520
 521 static struct uml_net *find_device(int n)
 522 {
 523         struct uml_net *device;
 524         struct list_head *ele;
 525
 526         spin_lock(&devices_lock);
 527         list_for_each(ele, &devices) {
 528                 device = list_entry(ele, struct uml_net, list);
 529                 if (device->index == n)
 530                         goto out;
 531         }
 532         device = NULL;
 533  out:
 534         spin_unlock(&devices_lock);
 535         return device;
 536 }
 537
 538 static int eth_parse(char *str, int *index_out, char **str_out,
 539                      char **error_out)
 540 {
 541         char *end;
 542         int n, err = -EINVAL;;
 543
 544         n = simple_strtoul(str, &end, 0);
 545         if (end == str) {
 546                 *error_out = "Bad device number";
 547                 return err;
 548         }
 549
 550         str = end;
 551         if (*str != '=') {
 552                 *error_out = "Expected '=' after device number";
 553                 return err;
 554         }
 555
 556         str++;
 557         if (find_device(n)) {
 558                 *error_out = "Device already configured";
 559                 return err;
 560         }
 561
 562         *index_out = n;
 563         *str_out = str;
 564         return 0;
 565 }
 566
 567 struct eth_init {
 568         struct list_head list;
 569         char *init;
 570         int index;
 571 };
 572
 573 static DEFINE_SPINLOCK(transports_lock);
 574 static LIST_HEAD(transports);
 575
 576 /* Filled in during early boot */
 577 static LIST_HEAD(eth_cmd_line);
 578
 579 static int check_transport(struct transport *transport, char *eth, int n,
 580                            void **init_out, char **mac_out)
 581 {
 582         int len;
 583
 584         len = strlen(transport->name);
 585         if (strncmp(eth, transport->name, len))
 586                 return 0;
 587
 588         eth += len;
 589         if (*eth == ',')
 590                 eth++;
 591         else if (*eth != '\0')
 592                 return 0;
 593
 594         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 595         if (*init_out == NULL)
 596                 return 1;
 597
 598         if (!transport->setup(eth, mac_out, *init_out)) {
 599                 kfree(*init_out);
 600                 *init_out = NULL;
 601         }
 602         return 1;
 603 }
 604
 605 void register_transport(struct transport *new)
 606 {
 607         struct list_head *ele, *next;
 608         struct eth_init *eth;
 609         void *init;
 610         char *mac = NULL;
 611         int match;
 612
 613         spin_lock(&transports_lock);
 614         BUG_ON(!list_empty(&new->list));
 615         list_add(&new->list, &transports);
 616         spin_unlock(&transports_lock);
 617
 618         list_for_each_safe(ele, next, &eth_cmd_line) {
 619                 eth = list_entry(ele, struct eth_init, list);
 620                 match = check_transport(new, eth->init, eth->index, &init,
 621                                         &mac);
 622                 if (!match)
 623                         continue;
 624                 else if (init != NULL) {
 625                         eth_configure(eth->index, init, mac, new);
 626                         kfree(init);
 627                 }
 628                 list_del(&eth->list);
 629         }
 630 }
 631
 632 static int eth_setup_common(char *str, int index)
 633 {
 634         struct list_head *ele;
 635         struct transport *transport;
 636         void *init;
 637         char *mac = NULL;
 638         int found = 0;
 639
 640         spin_lock(&transports_lock);
 641         list_for_each(ele, &transports) {
 642                 transport = list_entry(ele, struct transport, list);
 643                 if (!check_transport(transport, str, index, &init, &mac))
 644                         continue;
 645                 if (init != NULL) {
 646                         eth_configure(index, init, mac, transport);
 647                         kfree(init);
 648                 }
 649                 found = 1;
 650                 break;
 651         }
 652
 653         spin_unlock(&transports_lock);
 654         return found;
 655 }
 656
 657 static int __init eth_setup(char *str)
 658 {
 659         struct eth_init *new;
 660         char *error;
 661         int n, err;
 662
 663         err = eth_parse(str, &n, &str, &error);
 664         if (err) {
 665                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 666                        str, error);
 667                 return 1;
 668         }
 669
 670         new = alloc_bootmem(sizeof(*new));
 671         if (new == NULL) {
 672                 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
 673                 return 1;
 674         }
 675
 676         INIT_LIST_HEAD(&new->list);
 677         new->index = n;
 678         new->init = str;
 679
 680         list_add_tail(&new->list, &eth_cmd_line);
 681         return 1;
 682 }
 683
 684 __setup("eth", eth_setup);
 685 __uml_help(eth_setup,
 686 "eth[0-9]+=<transport>,<options>\n"
 687 "    Configure a network device.\n\n"
 688 );
 689
 690 static int net_config(char *str, char **error_out)
 691 {
 692         int n, err;
 693
 694         err = eth_parse(str, &n, &str, error_out);
 695         if (err)
 696                 return err;
 697
 698         /* This string is broken up and the pieces used by the underlying
 699          * driver.  So, it is freed only if eth_setup_common fails.
 700          */
 701         str = kstrdup(str, GFP_KERNEL);
 702         if (str == NULL) {
 703                 *error_out = "net_config failed to strdup string";
 704                 return -ENOMEM;
 705         }
 706         err = !eth_setup_common(str, n);
 707         if (err)
 708                 kfree(str);
 709         return err;
 710 }
 711
 712 static int net_id(char **str, int *start_out, int *end_out)
 713 {
 714         char *end;
 715         int n;
 716
 717         n = simple_strtoul(*str, &end, 0);
 718         if ((*end != '\0') || (end == *str))
 719                 return -1;
 720
 721         *start_out = n;
 722         *end_out = n;
 723         *str = end;
 724         return n;
 725 }
 726
 727 static int net_remove(int n, char **error_out)
 728 {
 729         struct uml_net *device;
 730         struct net_device *dev;
 731         struct uml_net_private *lp;
 732
 733         device = find_device(n);
 734         if (device == NULL)
 735                 return -ENODEV;
 736
 737         dev = device->dev;
 738         lp = dev->priv;
 739         if (lp->fd > 0)
 740                 return -EBUSY;
 741         unregister_netdev(dev);
 742         platform_device_unregister(&device->pdev);
 743
 744         return 0;
 745 }
 746
 747 static struct mc_device net_mc = {
 748         .list           = LIST_HEAD_INIT(net_mc.list),
 749         .name           = "eth",
 750         .config         = net_config,
 751         .get_config     = NULL,
 752         .id             = net_id,
 753         .remove         = net_remove,
 754 };
 755
 756 #ifdef CONFIG_INET
 757 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 758                               void *ptr)
 759 {
 760         struct in_ifaddr *ifa = ptr;
 761         struct net_device *dev = ifa->ifa_dev->dev;
 762         struct uml_net_private *lp;
 763         void (*proc)(unsigned char *, unsigned char *, void *);
 764         unsigned char addr_buf[4], netmask_buf[4];
 765
 766         if (dev->open != uml_net_open)
 767                 return NOTIFY_DONE;
 768
 769         lp = dev->priv;
 770
 771         proc = NULL;
 772         switch (event) {
 773         case NETDEV_UP:
 774                 proc = lp->add_address;
 775                 break;
 776         case NETDEV_DOWN:
 777                 proc = lp->delete_address;
 778                 break;
 779         }
 780         if (proc != NULL) {
 781                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 782                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 783                 (*proc)(addr_buf, netmask_buf, &lp->user);
 784         }
 785         return NOTIFY_DONE;
 786 }
 787
 788 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 789 static struct notifier_block uml_inetaddr_notifier = {
 790         .notifier_call          = uml_inetaddr_event,
 791 };
 792
 793 static void inet_register(void)
 794 {
 795         struct list_head *ele;
 796         struct uml_net_private *lp;
 797         struct in_device *ip;
 798         struct in_ifaddr *in;
 799
 800         register_inetaddr_notifier(&uml_inetaddr_notifier);
 801
 802         /* Devices may have been opened already, so the uml_inetaddr_notifier
 803          * didn't get a chance to run for them.  This fakes it so that
 804          * addresses which have already been set up get handled properly.
 805          */
 806         spin_lock(&opened_lock);
 807         list_for_each(ele, &opened) {
 808                 lp = list_entry(ele, struct uml_net_private, list);
 809                 ip = lp->dev->ip_ptr;
 810                 if (ip == NULL)
 811                         continue;
 812                 in = ip->ifa_list;
 813                 while (in != NULL) {
 814                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 815                         in = in->ifa_next;
 816                 }
 817         }
 818         spin_unlock(&opened_lock);
 819 }
 820 #else
 821 static inline void inet_register(void)
 822 {
 823 }
 824 #endif
 825
 826 static int uml_net_init(void)
 827 {
 828         mconsole_register_dev(&net_mc);
 829         inet_register();
 830         return 0;
 831 }
 832
 833 __initcall(uml_net_init);
 834
 835 static void close_devices(void)
 836 {
 837         struct list_head *ele;
 838         struct uml_net_private *lp;
 839
 840         spin_lock(&opened_lock);
 841         list_for_each(ele, &opened) {
 842                 lp = list_entry(ele, struct uml_net_private, list);
 843                 free_irq(lp->dev->irq, lp->dev);
 844                 if ((lp->close != NULL) && (lp->fd >= 0))
 845                         (*lp->close)(lp->fd, &lp->user);
 846                 if (lp->remove != NULL)
 847                         (*lp->remove)(&lp->user);
 848         }
 849         spin_unlock(&opened_lock);
 850 }
 851
 852 __uml_exitcall(close_devices);
 853
 854 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 855                                         void *),
 856                     void *arg)
 857 {
 858         struct net_device *dev = d;
 859         struct in_device *ip = dev->ip_ptr;
 860         struct in_ifaddr *in;
 861         unsigned char address[4], netmask[4];
 862
 863         if (ip == NULL) return;
 864         in = ip->ifa_list;
 865         while (in != NULL) {
 866                 memcpy(address, &in->ifa_address, sizeof(address));
 867                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 868                 (*cb)(address, netmask, arg);
 869                 in = in->ifa_next;
 870         }
 871 }
 872
 873 int dev_netmask(void *d, void *m)
 874 {
 875         struct net_device *dev = d;
 876         struct in_device *ip = dev->ip_ptr;
 877         struct in_ifaddr *in;
 878         __be32 *mask_out = m;
 879
 880         if (ip == NULL)
 881                 return 1;
 882
 883         in = ip->ifa_list;
 884         if (in == NULL)
 885                 return 1;
 886
 887         *mask_out = in->ifa_mask;
 888         return 0;
 889 }
 890
 891 void *get_output_buffer(int *len_out)
 892 {
 893         void *ret;
 894
 895         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 896         if (ret) *len_out = PAGE_SIZE;
 897         else *len_out = 0;
 898         return ret;
 899 }
 900
 901 void free_output_buffer(void *buffer)
 902 {
 903         free_pages((unsigned long) buffer, 0);
 904 }
 905
 906 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 907                      char **gate_addr)
 908 {
 909         char *remain;
 910
 911         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 912         if (remain != NULL) {
 913                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 914                        "specification : '%s'\n", remain);
 915                 return 1;
 916         }
 917
 918         return 0;
 919 }
 920
 921 unsigned short eth_protocol(struct sk_buff *skb)
 922 {
 923         return eth_type_trans(skb, skb->dev);
 924 }