linux/arch/um/drivers/net_kern.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   4 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   5 * James Leu (jleu@mindspring.net).
   6 * Copyright (C) 2001 by various other people who didn't put their name here.
   7 */
   8
   9#include <linux/memblock.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        }
 140out:
 141        spin_unlock(&lp->lock);
 142        return IRQ_HANDLED;
 143}
 144
 145static int uml_net_open(struct net_device *dev)
 146{
 147        struct uml_net_private *lp = netdev_priv(dev);
 148        int err;
 149
 150        if (lp->fd >= 0) {
 151                err = -ENXIO;
 152                goto out;
 153        }
 154
 155        lp->fd = (*lp->open)(&lp->user);
 156        if (lp->fd < 0) {
 157                err = lp->fd;
 158                goto out;
 159        }
 160
 161        err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 162                             IRQF_SHARED, dev->name, dev);
 163        if (err != 0) {
 164                printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 165                err = -ENETUNREACH;
 166                goto out_close;
 167        }
 168
 169        netif_start_queue(dev);
 170
 171        /* clear buffer - it can happen that the host side of the interface
 172         * is full when we get here.  In this case, new data is never queued,
 173         * SIGIOs never arrive, and the net never works.
 174         */
 175        while ((err = uml_net_rx(dev)) > 0) ;
 176
 177        spin_lock(&opened_lock);
 178        list_add(&lp->list, &opened);
 179        spin_unlock(&opened_lock);
 180
 181        return 0;
 182out_close:
 183        if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 184        lp->fd = -1;
 185out:
 186        return err;
 187}
 188
 189static int uml_net_close(struct net_device *dev)
 190{
 191        struct uml_net_private *lp = netdev_priv(dev);
 192
 193        netif_stop_queue(dev);
 194
 195        um_free_irq(dev->irq, dev);
 196        if (lp->close != NULL)
 197                (*lp->close)(lp->fd, &lp->user);
 198        lp->fd = -1;
 199
 200        spin_lock(&opened_lock);
 201        list_del(&lp->list);
 202        spin_unlock(&opened_lock);
 203
 204        return 0;
 205}
 206
 207static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 208{
 209        struct uml_net_private *lp = netdev_priv(dev);
 210        unsigned long flags;
 211        int len;
 212
 213        netif_stop_queue(dev);
 214
 215        spin_lock_irqsave(&lp->lock, flags);
 216
 217        len = (*lp->write)(lp->fd, skb, lp);
 218        skb_tx_timestamp(skb);
 219
 220        if (len == skb->len) {
 221                dev->stats.tx_packets++;
 222                dev->stats.tx_bytes += skb->len;
 223                netif_trans_update(dev);
 224                netif_start_queue(dev);
 225
 226                /* this is normally done in the interrupt when tx finishes */
 227                netif_wake_queue(dev);
 228        }
 229        else if (len == 0) {
 230                netif_start_queue(dev);
 231                dev->stats.tx_dropped++;
 232        }
 233        else {
 234                netif_start_queue(dev);
 235                printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 236        }
 237
 238        spin_unlock_irqrestore(&lp->lock, flags);
 239
 240        dev_consume_skb_any(skb);
 241
 242        return NETDEV_TX_OK;
 243}
 244
 245static void uml_net_set_multicast_list(struct net_device *dev)
 246{
 247        return;
 248}
 249
 250static void uml_net_tx_timeout(struct net_device *dev)
 251{
 252        netif_trans_update(dev);
 253        netif_wake_queue(dev);
 254}
 255
 256#ifdef CONFIG_NET_POLL_CONTROLLER
 257static void uml_net_poll_controller(struct net_device *dev)
 258{
 259        disable_irq(dev->irq);
 260        uml_net_interrupt(dev->irq, dev);
 261        enable_irq(dev->irq);
 262}
 263#endif
 264
 265static void uml_net_get_drvinfo(struct net_device *dev,
 266                                struct ethtool_drvinfo *info)
 267{
 268        strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 269        strlcpy(info->version, "42", sizeof(info->version));
 270}
 271
 272static const struct ethtool_ops uml_net_ethtool_ops = {
 273        .get_drvinfo    = uml_net_get_drvinfo,
 274        .get_link       = ethtool_op_get_link,
 275        .get_ts_info    = ethtool_op_get_ts_info,
 276};
 277
 278static void uml_net_user_timer_expire(struct timer_list *t)
 279{
 280#ifdef undef
 281        struct uml_net_private *lp = from_timer(lp, t, tl);
 282        struct connection *conn = &lp->user;
 283
 284        dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 285        do_connect(conn);
 286#endif
 287}
 288
 289void uml_net_setup_etheraddr(struct net_device *dev, char *str)
 290{
 291        unsigned char *addr = dev->dev_addr;
 292        char *end;
 293        int i;
 294
 295        if (str == NULL)
 296                goto random;
 297
 298        for (i = 0; i < 6; i++) {
 299                addr[i] = simple_strtoul(str, &end, 16);
 300                if ((end == str) ||
 301                   ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 302                        printk(KERN_ERR
 303                               "setup_etheraddr: failed to parse '%s' "
 304                               "as an ethernet address\n", str);
 305                        goto random;
 306                }
 307                str = end + 1;
 308        }
 309        if (is_multicast_ether_addr(addr)) {
 310                printk(KERN_ERR
 311                       "Attempt to assign a multicast ethernet address to a "
 312                       "device disallowed\n");
 313                goto random;
 314        }
 315        if (!is_valid_ether_addr(addr)) {
 316                printk(KERN_ERR
 317                       "Attempt to assign an invalid ethernet address to a "
 318                       "device disallowed\n");
 319                goto random;
 320        }
 321        if (!is_local_ether_addr(addr)) {
 322                printk(KERN_WARNING
 323                       "Warning: Assigning a globally valid ethernet "
 324                       "address to a device\n");
 325                printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 326                       "the first byte of the MAC,\n");
 327                printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 328                       addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 329                       addr[5]);
 330        }
 331        return;
 332
 333random:
 334        printk(KERN_INFO
 335               "Choosing a random ethernet address for device %s\n", dev->name);
 336        eth_hw_addr_random(dev);
 337}
 338
 339static DEFINE_SPINLOCK(devices_lock);
 340static LIST_HEAD(devices);
 341
 342static struct platform_driver uml_net_driver = {
 343        .driver = {
 344                .name  = DRIVER_NAME,
 345        },
 346};
 347
 348static void net_device_release(struct device *dev)
 349{
 350        struct uml_net *device = dev_get_drvdata(dev);
 351        struct net_device *netdev = device->dev;
 352        struct uml_net_private *lp = netdev_priv(netdev);
 353
 354        if (lp->remove != NULL)
 355                (*lp->remove)(&lp->user);
 356        list_del(&device->list);
 357        kfree(device);
 358        free_netdev(netdev);
 359}
 360
 361static const struct net_device_ops uml_netdev_ops = {
 362        .ndo_open               = uml_net_open,
 363        .ndo_stop               = uml_net_close,
 364        .ndo_start_xmit         = uml_net_start_xmit,
 365        .ndo_set_rx_mode        = uml_net_set_multicast_list,
 366        .ndo_tx_timeout         = uml_net_tx_timeout,
 367        .ndo_set_mac_address    = eth_mac_addr,
 368        .ndo_validate_addr      = eth_validate_addr,
 369#ifdef CONFIG_NET_POLL_CONTROLLER
 370        .ndo_poll_controller = uml_net_poll_controller,
 371#endif
 372};
 373
 374/*
 375 * Ensures that platform_driver_register is called only once by
 376 * eth_configure.  Will be set in an initcall.
 377 */
 378static int driver_registered;
 379
 380static void eth_configure(int n, void *init, char *mac,
 381                          struct transport *transport, gfp_t gfp_mask)
 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_mask);
 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        uml_net_setup_etheraddr(dev, mac);
 414
 415        printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
 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        dev_set_drvdata(&device->pdev.dev, 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        timer_setup(&lp->tl, uml_net_user_timer_expire, 0);
 460        spin_lock_init(&lp->lock);
 461        memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
 462
 463        if ((transport->user->init != NULL) &&
 464            ((*transport->user->init)(&lp->user, dev) != 0))
 465                goto out_unregister;
 466
 467        dev->mtu = transport->user->mtu;
 468        dev->netdev_ops = &uml_netdev_ops;
 469        dev->ethtool_ops = &uml_net_ethtool_ops;
 470        dev->watchdog_timeo = (HZ >> 1);
 471        dev->irq = UM_ETH_IRQ;
 472
 473        err = update_drop_skb(lp->max_packet);
 474        if (err)
 475                goto out_undo_user_init;
 476
 477        rtnl_lock();
 478        err = register_netdevice(dev);
 479        rtnl_unlock();
 480        if (err)
 481                goto out_undo_user_init;
 482
 483        spin_lock(&devices_lock);
 484        list_add(&device->list, &devices);
 485        spin_unlock(&devices_lock);
 486
 487        return;
 488
 489out_undo_user_init:
 490        if (transport->user->remove != NULL)
 491                (*transport->user->remove)(&lp->user);
 492out_unregister:
 493        platform_device_unregister(&device->pdev);
 494        return; /* platform_device_unregister frees dev and device */
 495out_free_netdev:
 496        free_netdev(dev);
 497out_free_device:
 498        kfree(device);
 499}
 500
 501static struct uml_net *find_device(int n)
 502{
 503        struct uml_net *device;
 504        struct list_head *ele;
 505
 506        spin_lock(&devices_lock);
 507        list_for_each(ele, &devices) {
 508                device = list_entry(ele, struct uml_net, list);
 509                if (device->index == n)
 510                        goto out;
 511        }
 512        device = NULL;
 513 out:
 514        spin_unlock(&devices_lock);
 515        return device;
 516}
 517
 518static int eth_parse(char *str, int *index_out, char **str_out,
 519                     char **error_out)
 520{
 521        char *end;
 522        int n, err = -EINVAL;
 523
 524        n = simple_strtoul(str, &end, 0);
 525        if (end == str) {
 526                *error_out = "Bad device number";
 527                return err;
 528        }
 529
 530        str = end;
 531        if (*str != '=') {
 532                *error_out = "Expected '=' after device number";
 533                return err;
 534        }
 535
 536        str++;
 537        if (find_device(n)) {
 538                *error_out = "Device already configured";
 539                return err;
 540        }
 541
 542        *index_out = n;
 543        *str_out = str;
 544        return 0;
 545}
 546
 547struct eth_init {
 548        struct list_head list;
 549        char *init;
 550        int index;
 551};
 552
 553static DEFINE_SPINLOCK(transports_lock);
 554static LIST_HEAD(transports);
 555
 556/* Filled in during early boot */
 557static LIST_HEAD(eth_cmd_line);
 558
 559static int check_transport(struct transport *transport, char *eth, int n,
 560                           void **init_out, char **mac_out, gfp_t gfp_mask)
 561{
 562        int len;
 563
 564        len = strlen(transport->name);
 565        if (strncmp(eth, transport->name, len))
 566                return 0;
 567
 568        eth += len;
 569        if (*eth == ',')
 570                eth++;
 571        else if (*eth != '\0')
 572                return 0;
 573
 574        *init_out = kmalloc(transport->setup_size, gfp_mask);
 575        if (*init_out == NULL)
 576                return 1;
 577
 578        if (!transport->setup(eth, mac_out, *init_out)) {
 579                kfree(*init_out);
 580                *init_out = NULL;
 581        }
 582        return 1;
 583}
 584
 585void register_transport(struct transport *new)
 586{
 587        struct list_head *ele, *next;
 588        struct eth_init *eth;
 589        void *init;
 590        char *mac = NULL;
 591        int match;
 592
 593        spin_lock(&transports_lock);
 594        BUG_ON(!list_empty(&new->list));
 595        list_add(&new->list, &transports);
 596        spin_unlock(&transports_lock);
 597
 598        list_for_each_safe(ele, next, &eth_cmd_line) {
 599                eth = list_entry(ele, struct eth_init, list);
 600                match = check_transport(new, eth->init, eth->index, &init,
 601                                        &mac, GFP_KERNEL);
 602                if (!match)
 603                        continue;
 604                else if (init != NULL) {
 605                        eth_configure(eth->index, init, mac, new, GFP_KERNEL);
 606                        kfree(init);
 607                }
 608                list_del(&eth->list);
 609        }
 610}
 611
 612static int eth_setup_common(char *str, int index)
 613{
 614        struct list_head *ele;
 615        struct transport *transport;
 616        void *init;
 617        char *mac = NULL;
 618        int found = 0;
 619
 620        spin_lock(&transports_lock);
 621        list_for_each(ele, &transports) {
 622                transport = list_entry(ele, struct transport, list);
 623                if (!check_transport(transport, str, index, &init,
 624                                        &mac, GFP_ATOMIC))
 625                        continue;
 626                if (init != NULL) {
 627                        eth_configure(index, init, mac, transport, GFP_ATOMIC);
 628                        kfree(init);
 629                }
 630                found = 1;
 631                break;
 632        }
 633
 634        spin_unlock(&transports_lock);
 635        return found;
 636}
 637
 638static int __init eth_setup(char *str)
 639{
 640        struct eth_init *new;
 641        char *error;
 642        int n, err;
 643
 644        err = eth_parse(str, &n, &str, &error);
 645        if (err) {
 646                printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 647                       str, error);
 648                return 1;
 649        }
 650
 651        new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
 652        if (!new)
 653                panic("%s: Failed to allocate %zu bytes\n", __func__,
 654                      sizeof(*new));
 655
 656        INIT_LIST_HEAD(&new->list);
 657        new->index = n;
 658        new->init = str;
 659
 660        list_add_tail(&new->list, &eth_cmd_line);
 661        return 1;
 662}
 663
 664__setup("eth", eth_setup);
 665__uml_help(eth_setup,
 666"eth[0-9]+=<transport>,<options>\n"
 667"    Configure a network device.\n\n"
 668);
 669
 670static int net_config(char *str, char **error_out)
 671{
 672        int n, err;
 673
 674        err = eth_parse(str, &n, &str, error_out);
 675        if (err)
 676                return err;
 677
 678        /* This string is broken up and the pieces used by the underlying
 679         * driver.  So, it is freed only if eth_setup_common fails.
 680         */
 681        str = kstrdup(str, GFP_KERNEL);
 682        if (str == NULL) {
 683                *error_out = "net_config failed to strdup string";
 684                return -ENOMEM;
 685        }
 686        err = !eth_setup_common(str, n);
 687        if (err)
 688                kfree(str);
 689        return err;
 690}
 691
 692static int net_id(char **str, int *start_out, int *end_out)
 693{
 694        char *end;
 695        int n;
 696
 697        n = simple_strtoul(*str, &end, 0);
 698        if ((*end != '\0') || (end == *str))
 699                return -1;
 700
 701        *start_out = n;
 702        *end_out = n;
 703        *str = end;
 704        return n;
 705}
 706
 707static int net_remove(int n, char **error_out)
 708{
 709        struct uml_net *device;
 710        struct net_device *dev;
 711        struct uml_net_private *lp;
 712
 713        device = find_device(n);
 714        if (device == NULL)
 715                return -ENODEV;
 716
 717        dev = device->dev;
 718        lp = netdev_priv(dev);
 719        if (lp->fd > 0)
 720                return -EBUSY;
 721        unregister_netdev(dev);
 722        platform_device_unregister(&device->pdev);
 723
 724        return 0;
 725}
 726
 727static struct mc_device net_mc = {
 728        .list           = LIST_HEAD_INIT(net_mc.list),
 729        .name           = "eth",
 730        .config         = net_config,
 731        .get_config     = NULL,
 732        .id             = net_id,
 733        .remove         = net_remove,
 734};
 735
 736#ifdef CONFIG_INET
 737static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 738                              void *ptr)
 739{
 740        struct in_ifaddr *ifa = ptr;
 741        struct net_device *dev = ifa->ifa_dev->dev;
 742        struct uml_net_private *lp;
 743        void (*proc)(unsigned char *, unsigned char *, void *);
 744        unsigned char addr_buf[4], netmask_buf[4];
 745
 746        if (dev->netdev_ops->ndo_open != uml_net_open)
 747                return NOTIFY_DONE;
 748
 749        lp = netdev_priv(dev);
 750
 751        proc = NULL;
 752        switch (event) {
 753        case NETDEV_UP:
 754                proc = lp->add_address;
 755                break;
 756        case NETDEV_DOWN:
 757                proc = lp->delete_address;
 758                break;
 759        }
 760        if (proc != NULL) {
 761                memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 762                memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 763                (*proc)(addr_buf, netmask_buf, &lp->user);
 764        }
 765        return NOTIFY_DONE;
 766}
 767
 768/* uml_net_init shouldn't be called twice on two CPUs at the same time */
 769static struct notifier_block uml_inetaddr_notifier = {
 770        .notifier_call          = uml_inetaddr_event,
 771};
 772
 773static void inet_register(void)
 774{
 775        struct list_head *ele;
 776        struct uml_net_private *lp;
 777        struct in_device *ip;
 778        struct in_ifaddr *in;
 779
 780        register_inetaddr_notifier(&uml_inetaddr_notifier);
 781
 782        /* Devices may have been opened already, so the uml_inetaddr_notifier
 783         * didn't get a chance to run for them.  This fakes it so that
 784         * addresses which have already been set up get handled properly.
 785         */
 786        spin_lock(&opened_lock);
 787        list_for_each(ele, &opened) {
 788                lp = list_entry(ele, struct uml_net_private, list);
 789                ip = lp->dev->ip_ptr;
 790                if (ip == NULL)
 791                        continue;
 792                in = ip->ifa_list;
 793                while (in != NULL) {
 794                        uml_inetaddr_event(NULL, NETDEV_UP, in);
 795                        in = in->ifa_next;
 796                }
 797        }
 798        spin_unlock(&opened_lock);
 799}
 800#else
 801static inline void inet_register(void)
 802{
 803}
 804#endif
 805
 806static int uml_net_init(void)
 807{
 808        mconsole_register_dev(&net_mc);
 809        inet_register();
 810        return 0;
 811}
 812
 813__initcall(uml_net_init);
 814
 815static void close_devices(void)
 816{
 817        struct list_head *ele;
 818        struct uml_net_private *lp;
 819
 820        spin_lock(&opened_lock);
 821        list_for_each(ele, &opened) {
 822                lp = list_entry(ele, struct uml_net_private, list);
 823                um_free_irq(lp->dev->irq, lp->dev);
 824                if ((lp->close != NULL) && (lp->fd >= 0))
 825                        (*lp->close)(lp->fd, &lp->user);
 826                if (lp->remove != NULL)
 827                        (*lp->remove)(&lp->user);
 828        }
 829        spin_unlock(&opened_lock);
 830}
 831
 832__uml_exitcall(close_devices);
 833
 834void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 835                                        void *),
 836                    void *arg)
 837{
 838        struct net_device *dev = d;
 839        struct in_device *ip = dev->ip_ptr;
 840        struct in_ifaddr *in;
 841        unsigned char address[4], netmask[4];
 842
 843        if (ip == NULL) return;
 844        in = ip->ifa_list;
 845        while (in != NULL) {
 846                memcpy(address, &in->ifa_address, sizeof(address));
 847                memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 848                (*cb)(address, netmask, arg);
 849                in = in->ifa_next;
 850        }
 851}
 852
 853int dev_netmask(void *d, void *m)
 854{
 855        struct net_device *dev = d;
 856        struct in_device *ip = dev->ip_ptr;
 857        struct in_ifaddr *in;
 858        __be32 *mask_out = m;
 859
 860        if (ip == NULL)
 861                return 1;
 862
 863        in = ip->ifa_list;
 864        if (in == NULL)
 865                return 1;
 866
 867        *mask_out = in->ifa_mask;
 868        return 0;
 869}
 870
 871void *get_output_buffer(int *len_out)
 872{
 873        void *ret;
 874
 875        ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 876        if (ret) *len_out = PAGE_SIZE;
 877        else *len_out = 0;
 878        return ret;
 879}
 880
 881void free_output_buffer(void *buffer)
 882{
 883        free_pages((unsigned long) buffer, 0);
 884}
 885
 886int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 887                     char **gate_addr)
 888{
 889        char *remain;
 890
 891        remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 892        if (remain != NULL) {
 893                printk(KERN_ERR "tap_setup_common - Extra garbage on "
 894                       "specification : '%s'\n", remain);
 895                return 1;
 896        }
 897
 898        return 0;
 899}
 900
 901unsigned short eth_protocol(struct sk_buff *skb)
 902{
 903        return eth_type_trans(skb, skb->dev);
 904}
 905