linux/arch/um/drivers/net_kern.c
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   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
  30static DEFINE_SPINLOCK(opened_lock);
  31static 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 */
  41static DEFINE_SPINLOCK(drop_lock);
  42static struct sk_buff *drop_skb;
  43static int drop_max;
  44
  45static 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;
  67out:
  68        spin_unlock_irqrestore(&drop_lock, flags);
  69
  70        return err;
  71}
  72
  73static 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
 108static 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
 115static 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
 142out:
 143        spin_unlock(&lp->lock);
 144        return IRQ_HANDLED;
 145}
 146
 147static 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;
 185out_close:
 186        if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 187        lp->fd = -1;
 188out:
 189        return err;
 190}
 191
 192static int uml_net_close(struct net_device *dev)
 193{
 194        struct uml_net_private *lp = netdev_priv(dev);
 195
 196        netif_stop_queue(dev);
 197
 198        free_irq(dev->irq, dev);
 199        if (lp->close != NULL)
 200                (*lp->close)(lp->fd, &lp->user);
 201        lp->fd = -1;
 202
 203        spin_lock(&opened_lock);
 204        list_del(&lp->list);
 205        spin_unlock(&opened_lock);
 206
 207        return 0;
 208}
 209
 210static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 211{
 212        struct uml_net_private *lp = netdev_priv(dev);
 213        unsigned long flags;
 214        int len;
 215
 216        netif_stop_queue(dev);
 217
 218        spin_lock_irqsave(&lp->lock, flags);
 219
 220        len = (*lp->write)(lp->fd, skb, lp);
 221
 222        if (len == skb->len) {
 223                dev->stats.tx_packets++;
 224                dev->stats.tx_bytes += skb->len;
 225                dev->trans_start = jiffies;
 226                netif_start_queue(dev);
 227
 228                /* this is normally done in the interrupt when tx finishes */
 229                netif_wake_queue(dev);
 230        }
 231        else if (len == 0) {
 232                netif_start_queue(dev);
 233                dev->stats.tx_dropped++;
 234        }
 235        else {
 236                netif_start_queue(dev);
 237                printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 238        }
 239
 240        spin_unlock_irqrestore(&lp->lock, flags);
 241
 242        dev_kfree_skb(skb);
 243
 244        return NETDEV_TX_OK;
 245}
 246
 247static void uml_net_set_multicast_list(struct net_device *dev)
 248{
 249        return;
 250}
 251
 252static void uml_net_tx_timeout(struct net_device *dev)
 253{
 254        dev->trans_start = jiffies;
 255        netif_wake_queue(dev);
 256}
 257
 258static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 259{
 260        dev->mtu = new_mtu;
 261
 262        return 0;
 263}
 264
 265#ifdef CONFIG_NET_POLL_CONTROLLER
 266static void uml_net_poll_controller(struct net_device *dev)
 267{
 268        disable_irq(dev->irq);
 269        uml_net_interrupt(dev->irq, dev);
 270        enable_irq(dev->irq);
 271}
 272#endif
 273
 274static void uml_net_get_drvinfo(struct net_device *dev,
 275                                struct ethtool_drvinfo *info)
 276{
 277        strcpy(info->driver, DRIVER_NAME);
 278        strcpy(info->version, "42");
 279}
 280
 281static const struct ethtool_ops uml_net_ethtool_ops = {
 282        .get_drvinfo    = uml_net_get_drvinfo,
 283        .get_link       = ethtool_op_get_link,
 284};
 285
 286static void uml_net_user_timer_expire(unsigned long _conn)
 287{
 288#ifdef undef
 289        struct connection *conn = (struct connection *)_conn;
 290
 291        dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 292        do_connect(conn);
 293#endif
 294}
 295
 296static int setup_etheraddr(char *str, unsigned char *addr, char *name)
 297{
 298        char *end;
 299        int i;
 300
 301        if (str == NULL)
 302                goto random;
 303
 304        for (i = 0; i < 6; i++) {
 305                addr[i] = simple_strtoul(str, &end, 16);
 306                if ((end == str) ||
 307                   ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 308                        printk(KERN_ERR
 309                               "setup_etheraddr: failed to parse '%s' "
 310                               "as an ethernet address\n", str);
 311                        goto random;
 312                }
 313                str = end + 1;
 314        }
 315        if (is_multicast_ether_addr(addr)) {
 316                printk(KERN_ERR
 317                       "Attempt to assign a multicast ethernet address to a "
 318                       "device disallowed\n");
 319                goto random;
 320        }
 321        if (!is_valid_ether_addr(addr)) {
 322                printk(KERN_ERR
 323                       "Attempt to assign an invalid ethernet address to a "
 324                       "device disallowed\n");
 325                goto random;
 326        }
 327        if (!is_local_ether_addr(addr)) {
 328                printk(KERN_WARNING
 329                       "Warning: Assigning a globally valid ethernet "
 330                       "address to a device\n");
 331                printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 332                       "the first byte of the MAC,\n");
 333                printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 334                       addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 335                       addr[5]);
 336        }
 337        return 0;
 338
 339random:
 340        printk(KERN_INFO
 341               "Choosing a random ethernet address for device %s\n", name);
 342        random_ether_addr(addr);
 343        return 1;
 344}
 345
 346static DEFINE_SPINLOCK(devices_lock);
 347static LIST_HEAD(devices);
 348
 349static struct platform_driver uml_net_driver = {
 350        .driver = {
 351                .name  = DRIVER_NAME,
 352        },
 353};
 354
 355static void net_device_release(struct device *dev)
 356{
 357        struct uml_net *device = dev_get_drvdata(dev);
 358        struct net_device *netdev = device->dev;
 359        struct uml_net_private *lp = netdev_priv(netdev);
 360
 361        if (lp->remove != NULL)
 362                (*lp->remove)(&lp->user);
 363        list_del(&device->list);
 364        kfree(device);
 365        free_netdev(netdev);
 366}
 367
 368static const struct net_device_ops uml_netdev_ops = {
 369        .ndo_open               = uml_net_open,
 370        .ndo_stop               = uml_net_close,
 371        .ndo_start_xmit         = uml_net_start_xmit,
 372        .ndo_set_rx_mode        = uml_net_set_multicast_list,
 373        .ndo_tx_timeout         = uml_net_tx_timeout,
 374        .ndo_set_mac_address    = eth_mac_addr,
 375        .ndo_change_mtu         = uml_net_change_mtu,
 376        .ndo_validate_addr      = eth_validate_addr,
 377#ifdef CONFIG_NET_POLL_CONTROLLER
 378        .ndo_poll_controller = uml_net_poll_controller,
 379#endif
 380};
 381
 382/*
 383 * Ensures that platform_driver_register is called only once by
 384 * eth_configure.  Will be set in an initcall.
 385 */
 386static int driver_registered;
 387
 388static void eth_configure(int n, void *init, char *mac,
 389                          struct transport *transport)
 390{
 391        struct uml_net *device;
 392        struct net_device *dev;
 393        struct uml_net_private *lp;
 394        int err, size;
 395        int random_mac;
 396
 397        size = transport->private_size + sizeof(struct uml_net_private);
 398
 399        device = kzalloc(sizeof(*device), GFP_KERNEL);
 400        if (device == NULL) {
 401                printk(KERN_ERR "eth_configure failed to allocate struct "
 402                       "uml_net\n");
 403                return;
 404        }
 405
 406        dev = alloc_etherdev(size);
 407        if (dev == NULL) {
 408                printk(KERN_ERR "eth_configure: failed to allocate struct "
 409                       "net_device for eth%d\n", n);
 410                goto out_free_device;
 411        }
 412
 413        INIT_LIST_HEAD(&device->list);
 414        device->index = n;
 415
 416        /* If this name ends up conflicting with an existing registered
 417         * netdevice, that is OK, register_netdev{,ice}() will notice this
 418         * and fail.
 419         */
 420        snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 421
 422        random_mac = setup_etheraddr(mac, device->mac, dev->name);
 423
 424        printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac);
 425
 426        lp = netdev_priv(dev);
 427        /* This points to the transport private data. It's still clear, but we
 428         * must memset it to 0 *now*. Let's help the drivers. */
 429        memset(lp, 0, size);
 430        INIT_WORK(&lp->work, uml_dev_close);
 431
 432        /* sysfs register */
 433        if (!driver_registered) {
 434                platform_driver_register(&uml_net_driver);
 435                driver_registered = 1;
 436        }
 437        device->pdev.id = n;
 438        device->pdev.name = DRIVER_NAME;
 439        device->pdev.dev.release = net_device_release;
 440        dev_set_drvdata(&device->pdev.dev, device);
 441        if (platform_device_register(&device->pdev))
 442                goto out_free_netdev;
 443        SET_NETDEV_DEV(dev,&device->pdev.dev);
 444
 445        device->dev = dev;
 446
 447        /*
 448         * These just fill in a data structure, so there's no failure
 449         * to be worried about.
 450         */
 451        (*transport->kern->init)(dev, init);
 452
 453        *lp = ((struct uml_net_private)
 454                { .list                 = LIST_HEAD_INIT(lp->list),
 455                  .dev                  = dev,
 456                  .fd                   = -1,
 457                  .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 458                  .max_packet           = transport->user->max_packet,
 459                  .protocol             = transport->kern->protocol,
 460                  .open                 = transport->user->open,
 461                  .close                = transport->user->close,
 462                  .remove               = transport->user->remove,
 463                  .read                 = transport->kern->read,
 464                  .write                = transport->kern->write,
 465                  .add_address          = transport->user->add_address,
 466                  .delete_address       = transport->user->delete_address });
 467
 468        init_timer(&lp->tl);
 469        spin_lock_init(&lp->lock);
 470        lp->tl.function = uml_net_user_timer_expire;
 471        memcpy(lp->mac, device->mac, sizeof(lp->mac));
 472
 473        if ((transport->user->init != NULL) &&
 474            ((*transport->user->init)(&lp->user, dev) != 0))
 475                goto out_unregister;
 476
 477        /* don't use eth_mac_addr, it will not work here */
 478        memcpy(dev->dev_addr, device->mac, ETH_ALEN);
 479        if (random_mac)
 480                dev->addr_assign_type |= NET_ADDR_RANDOM;
 481
 482        dev->mtu = transport->user->mtu;
 483        dev->netdev_ops = &uml_netdev_ops;
 484        dev->ethtool_ops = &uml_net_ethtool_ops;
 485        dev->watchdog_timeo = (HZ >> 1);
 486        dev->irq = UM_ETH_IRQ;
 487
 488        err = update_drop_skb(lp->max_packet);
 489        if (err)
 490                goto out_undo_user_init;
 491
 492        rtnl_lock();
 493        err = register_netdevice(dev);
 494        rtnl_unlock();
 495        if (err)
 496                goto out_undo_user_init;
 497
 498        spin_lock(&devices_lock);
 499        list_add(&device->list, &devices);
 500        spin_unlock(&devices_lock);
 501
 502        return;
 503
 504out_undo_user_init:
 505        if (transport->user->remove != NULL)
 506                (*transport->user->remove)(&lp->user);
 507out_unregister:
 508        platform_device_unregister(&device->pdev);
 509        return; /* platform_device_unregister frees dev and device */
 510out_free_netdev:
 511        free_netdev(dev);
 512out_free_device:
 513        kfree(device);
 514}
 515
 516static struct uml_net *find_device(int n)
 517{
 518        struct uml_net *device;
 519        struct list_head *ele;
 520
 521        spin_lock(&devices_lock);
 522        list_for_each(ele, &devices) {
 523                device = list_entry(ele, struct uml_net, list);
 524                if (device->index == n)
 525                        goto out;
 526        }
 527        device = NULL;
 528 out:
 529        spin_unlock(&devices_lock);
 530        return device;
 531}
 532
 533static int eth_parse(char *str, int *index_out, char **str_out,
 534                     char **error_out)
 535{
 536        char *end;
 537        int n, err = -EINVAL;
 538
 539        n = simple_strtoul(str, &end, 0);
 540        if (end == str) {
 541                *error_out = "Bad device number";
 542                return err;
 543        }
 544
 545        str = end;
 546        if (*str != '=') {
 547                *error_out = "Expected '=' after device number";
 548                return err;
 549        }
 550
 551        str++;
 552        if (find_device(n)) {
 553                *error_out = "Device already configured";
 554                return err;
 555        }
 556
 557        *index_out = n;
 558        *str_out = str;
 559        return 0;
 560}
 561
 562struct eth_init {
 563        struct list_head list;
 564        char *init;
 565        int index;
 566};
 567
 568static DEFINE_SPINLOCK(transports_lock);
 569static LIST_HEAD(transports);
 570
 571/* Filled in during early boot */
 572static LIST_HEAD(eth_cmd_line);
 573
 574static int check_transport(struct transport *transport, char *eth, int n,
 575                           void **init_out, char **mac_out)
 576{
 577        int len;
 578
 579        len = strlen(transport->name);
 580        if (strncmp(eth, transport->name, len))
 581                return 0;
 582
 583        eth += len;
 584        if (*eth == ',')
 585                eth++;
 586        else if (*eth != '\0')
 587                return 0;
 588
 589        *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 590        if (*init_out == NULL)
 591                return 1;
 592
 593        if (!transport->setup(eth, mac_out, *init_out)) {
 594                kfree(*init_out);
 595                *init_out = NULL;
 596        }
 597        return 1;
 598}
 599
 600void register_transport(struct transport *new)
 601{
 602        struct list_head *ele, *next;
 603        struct eth_init *eth;
 604        void *init;
 605        char *mac = NULL;
 606        int match;
 607
 608        spin_lock(&transports_lock);
 609        BUG_ON(!list_empty(&new->list));
 610        list_add(&new->list, &transports);
 611        spin_unlock(&transports_lock);
 612
 613        list_for_each_safe(ele, next, &eth_cmd_line) {
 614                eth = list_entry(ele, struct eth_init, list);
 615                match = check_transport(new, eth->init, eth->index, &init,
 616                                        &mac);
 617                if (!match)
 618                        continue;
 619                else if (init != NULL) {
 620                        eth_configure(eth->index, init, mac, new);
 621                        kfree(init);
 622                }
 623                list_del(&eth->list);
 624        }
 625}
 626
 627static int eth_setup_common(char *str, int index)
 628{
 629        struct list_head *ele;
 630        struct transport *transport;
 631        void *init;
 632        char *mac = NULL;
 633        int found = 0;
 634
 635        spin_lock(&transports_lock);
 636        list_for_each(ele, &transports) {
 637                transport = list_entry(ele, struct transport, list);
 638                if (!check_transport(transport, str, index, &init, &mac))
 639                        continue;
 640                if (init != NULL) {
 641                        eth_configure(index, init, mac, transport);
 642                        kfree(init);
 643                }
 644                found = 1;
 645                break;
 646        }
 647
 648        spin_unlock(&transports_lock);
 649        return found;
 650}
 651
 652static int __init eth_setup(char *str)
 653{
 654        struct eth_init *new;
 655        char *error;
 656        int n, err;
 657
 658        err = eth_parse(str, &n, &str, &error);
 659        if (err) {
 660                printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 661                       str, error);
 662                return 1;
 663        }
 664
 665        new = alloc_bootmem(sizeof(*new));
 666        if (new == NULL) {
 667                printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
 668                return 1;
 669        }
 670
 671        INIT_LIST_HEAD(&new->list);
 672        new->index = n;
 673        new->init = str;
 674
 675        list_add_tail(&new->list, &eth_cmd_line);
 676        return 1;
 677}
 678
 679__setup("eth", eth_setup);
 680__uml_help(eth_setup,
 681"eth[0-9]+=<transport>,<options>\n"
 682"    Configure a network device.\n\n"
 683);
 684
 685static int net_config(char *str, char **error_out)
 686{
 687        int n, err;
 688
 689        err = eth_parse(str, &n, &str, error_out);
 690        if (err)
 691                return err;
 692
 693        /* This string is broken up and the pieces used by the underlying
 694         * driver.  So, it is freed only if eth_setup_common fails.
 695         */
 696        str = kstrdup(str, GFP_KERNEL);
 697        if (str == NULL) {
 698                *error_out = "net_config failed to strdup string";
 699                return -ENOMEM;
 700        }
 701        err = !eth_setup_common(str, n);
 702        if (err)
 703                kfree(str);
 704        return err;
 705}
 706
 707static int net_id(char **str, int *start_out, int *end_out)
 708{
 709        char *end;
 710        int n;
 711
 712        n = simple_strtoul(*str, &end, 0);
 713        if ((*end != '\0') || (end == *str))
 714                return -1;
 715
 716        *start_out = n;
 717        *end_out = n;
 718        *str = end;
 719        return n;
 720}
 721
 722static int net_remove(int n, char **error_out)
 723{
 724        struct uml_net *device;
 725        struct net_device *dev;
 726        struct uml_net_private *lp;
 727
 728        device = find_device(n);
 729        if (device == NULL)
 730                return -ENODEV;
 731
 732        dev = device->dev;
 733        lp = netdev_priv(dev);
 734        if (lp->fd > 0)
 735                return -EBUSY;
 736        unregister_netdev(dev);
 737        platform_device_unregister(&device->pdev);
 738
 739        return 0;
 740}
 741
 742static struct mc_device net_mc = {
 743        .list           = LIST_HEAD_INIT(net_mc.list),
 744        .name           = "eth",
 745        .config         = net_config,
 746        .get_config     = NULL,
 747        .id             = net_id,
 748        .remove         = net_remove,
 749};
 750
 751#ifdef CONFIG_INET
 752static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 753                              void *ptr)
 754{
 755        struct in_ifaddr *ifa = ptr;
 756        struct net_device *dev = ifa->ifa_dev->dev;
 757        struct uml_net_private *lp;
 758        void (*proc)(unsigned char *, unsigned char *, void *);
 759        unsigned char addr_buf[4], netmask_buf[4];
 760
 761        if (dev->netdev_ops->ndo_open != uml_net_open)
 762                return NOTIFY_DONE;
 763
 764        lp = netdev_priv(dev);
 765
 766        proc = NULL;
 767        switch (event) {
 768        case NETDEV_UP:
 769                proc = lp->add_address;
 770                break;
 771        case NETDEV_DOWN:
 772                proc = lp->delete_address;
 773                break;
 774        }
 775        if (proc != NULL) {
 776                memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 777                memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 778                (*proc)(addr_buf, netmask_buf, &lp->user);
 779        }
 780        return NOTIFY_DONE;
 781}
 782
 783/* uml_net_init shouldn't be called twice on two CPUs at the same time */
 784static struct notifier_block uml_inetaddr_notifier = {
 785        .notifier_call          = uml_inetaddr_event,
 786};
 787
 788static void inet_register(void)
 789{
 790        struct list_head *ele;
 791        struct uml_net_private *lp;
 792        struct in_device *ip;
 793        struct in_ifaddr *in;
 794
 795        register_inetaddr_notifier(&uml_inetaddr_notifier);
 796
 797        /* Devices may have been opened already, so the uml_inetaddr_notifier
 798         * didn't get a chance to run for them.  This fakes it so that
 799         * addresses which have already been set up get handled properly.
 800         */
 801        spin_lock(&opened_lock);
 802        list_for_each(ele, &opened) {
 803                lp = list_entry(ele, struct uml_net_private, list);
 804                ip = lp->dev->ip_ptr;
 805                if (ip == NULL)
 806                        continue;
 807                in = ip->ifa_list;
 808                while (in != NULL) {
 809                        uml_inetaddr_event(NULL, NETDEV_UP, in);
 810                        in = in->ifa_next;
 811                }
 812        }
 813        spin_unlock(&opened_lock);
 814}
 815#else
 816static inline void inet_register(void)
 817{
 818}
 819#endif
 820
 821static int uml_net_init(void)
 822{
 823        mconsole_register_dev(&net_mc);
 824        inet_register();
 825        return 0;
 826}
 827
 828__initcall(uml_net_init);
 829
 830static void close_devices(void)
 831{
 832        struct list_head *ele;
 833        struct uml_net_private *lp;
 834
 835        spin_lock(&opened_lock);
 836        list_for_each(ele, &opened) {
 837                lp = list_entry(ele, struct uml_net_private, list);
 838                free_irq(lp->dev->irq, lp->dev);
 839                if ((lp->close != NULL) && (lp->fd >= 0))
 840                        (*lp->close)(lp->fd, &lp->user);
 841                if (lp->remove != NULL)
 842                        (*lp->remove)(&lp->user);
 843        }
 844        spin_unlock(&opened_lock);
 845}
 846
 847__uml_exitcall(close_devices);
 848
 849void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 850                                        void *),
 851                    void *arg)
 852{
 853        struct net_device *dev = d;
 854        struct in_device *ip = dev->ip_ptr;
 855        struct in_ifaddr *in;
 856        unsigned char address[4], netmask[4];
 857
 858        if (ip == NULL) return;
 859        in = ip->ifa_list;
 860        while (in != NULL) {
 861                memcpy(address, &in->ifa_address, sizeof(address));
 862                memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 863                (*cb)(address, netmask, arg);
 864                in = in->ifa_next;
 865        }
 866}
 867
 868int dev_netmask(void *d, void *m)
 869{
 870        struct net_device *dev = d;
 871        struct in_device *ip = dev->ip_ptr;
 872        struct in_ifaddr *in;
 873        __be32 *mask_out = m;
 874
 875        if (ip == NULL)
 876                return 1;
 877
 878        in = ip->ifa_list;
 879        if (in == NULL)
 880                return 1;
 881
 882        *mask_out = in->ifa_mask;
 883        return 0;
 884}
 885
 886void *get_output_buffer(int *len_out)
 887{
 888        void *ret;
 889
 890        ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 891        if (ret) *len_out = PAGE_SIZE;
 892        else *len_out = 0;
 893        return ret;
 894}
 895
 896void free_output_buffer(void *buffer)
 897{
 898        free_pages((unsigned long) buffer, 0);
 899}
 900
 901int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 902                     char **gate_addr)
 903{
 904        char *remain;
 905
 906        remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 907        if (remain != NULL) {
 908                printk(KERN_ERR "tap_setup_common - Extra garbage on "
 909                       "specification : '%s'\n", remain);
 910                return 1;
 911        }
 912
 913        return 0;
 914}
 915
 916unsigned short eth_protocol(struct sk_buff *skb)
 917{
 918        return eth_type_trans(skb, skb->dev);
 919}
 920
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