arch/um/drivers/net_kern.c

   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
  30 static DEFINE_SPINLOCK(opened_lock);
  31 static LIST_HEAD(opened);
  32
  33 /*
  34  * The drop_skb is used when we can't allocate an skb.  The
  35  * packet is read into drop_skb in order to get the data off the
  36  * connection to the host.
  37  * It is reallocated whenever a maximum packet size is seen which is
  38  * larger than any seen before.  update_drop_skb is called from
  39  * eth_configure when a new interface is added.
  40  */
  41 static DEFINE_SPINLOCK(drop_lock);
  42 static struct sk_buff *drop_skb;
  43 static int drop_max;
  44
  45 static int update_drop_skb(int max)
  46 {
  47         struct sk_buff *new;
  48         unsigned long flags;
  49         int err = 0;
  50
  51         spin_lock_irqsave(&drop_lock, flags);
  52
  53         if (max <= drop_max)
  54                 goto out;
  55
  56         err = -ENOMEM;
  57         new = dev_alloc_skb(max);
  58         if (new == NULL)
  59                 goto out;
  60
  61         skb_put(new, max);
  62
  63         kfree_skb(drop_skb);
  64         drop_skb = new;
  65         drop_max = max;
  66         err = 0;
  67 out:
  68         spin_unlock_irqrestore(&drop_lock, flags);
  69
  70         return err;
  71 }
  72
  73 static int uml_net_rx(struct net_device *dev)
  74 {
  75         struct uml_net_private *lp = netdev_priv(dev);
  76         int pkt_len;
  77         struct sk_buff *skb;
  78
  79         /* If we can't allocate memory, try again next round. */
  80         skb = dev_alloc_skb(lp->max_packet);
  81         if (skb == NULL) {
  82                 drop_skb->dev = dev;
  83                 /* Read a packet into drop_skb and don't do anything with it. */
  84                 (*lp->read)(lp->fd, drop_skb, lp);
  85                 dev->stats.rx_dropped++;
  86                 return 0;
  87         }
  88
  89         skb->dev = dev;
  90         skb_put(skb, lp->max_packet);
  91         skb_reset_mac_header(skb);
  92         pkt_len = (*lp->read)(lp->fd, skb, lp);
  93
  94         if (pkt_len > 0) {
  95                 skb_trim(skb, pkt_len);
  96                 skb->protocol = (*lp->protocol)(skb);
  97
  98                 dev->stats.rx_bytes += skb->len;
  99                 dev->stats.rx_packets++;
 100                 netif_rx(skb);
 101                 return pkt_len;
 102         }
 103
 104         kfree_skb(skb);
 105         return pkt_len;
 106 }
 107
 108 static void uml_dev_close(struct work_struct *work)
 109 {
 110         struct uml_net_private *lp =
 111                 container_of(work, struct uml_net_private, work);
 112         dev_close(lp->dev);
 113 }
 114
 115 static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
 116 {
 117         struct net_device *dev = dev_id;
 118         struct uml_net_private *lp = netdev_priv(dev);
 119         int err;
 120
 121         if (!netif_running(dev))
 122                 return IRQ_NONE;
 123
 124         spin_lock(&lp->lock);
 125         while ((err = uml_net_rx(dev)) > 0) ;
 126         if (err < 0) {
 127                 printk(KERN_ERR
 128                        "Device '%s' read returned %d, shutting it down\n",
 129                        dev->name, err);
 130                 /* dev_close can't be called in interrupt context, and takes
 131                  * again lp->lock.
 132                  * And dev_close() can be safely called multiple times on the
 133                  * same device, since it tests for (dev->flags & IFF_UP). So
 134                  * there's no harm in delaying the device shutdown.
 135                  * Furthermore, the workqueue will not re-enqueue an already
 136                  * enqueued work item. */
 137                 schedule_work(&lp->work);
 138                 goto out;
 139         }
 140 out:
 141         spin_unlock(&lp->lock);
 142         return IRQ_HANDLED;
 143 }
 144
 145 static 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;
 182 out_close:
 183         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 184         lp->fd = -1;
 185 out:
 186         return err;
 187 }
 188
 189 static 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
 207 static 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
 245 static void uml_net_set_multicast_list(struct net_device *dev)
 246 {
 247         return;
 248 }
 249
 250 static void uml_net_tx_timeout(struct net_device *dev, unsigned int txqueue)
 251 {
 252         netif_trans_update(dev);
 253         netif_wake_queue(dev);
 254 }
 255
 256 #ifdef CONFIG_NET_POLL_CONTROLLER
 257 static 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
 265 static 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 }
 270
 271 static const struct ethtool_ops uml_net_ethtool_ops = {
 272         .get_drvinfo    = uml_net_get_drvinfo,
 273         .get_link       = ethtool_op_get_link,
 274         .get_ts_info    = ethtool_op_get_ts_info,
 275 };
 276
 277 void uml_net_setup_etheraddr(struct net_device *dev, char *str)
 278 {
 279         unsigned char *addr = dev->dev_addr;
 280         char *end;
 281         int i;
 282
 283         if (str == NULL)
 284                 goto random;
 285
 286         for (i = 0; i < 6; i++) {
 287                 addr[i] = simple_strtoul(str, &end, 16);
 288                 if ((end == str) ||
 289                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 290                         printk(KERN_ERR
 291                                "setup_etheraddr: failed to parse '%s' "
 292                                "as an ethernet address\n", str);
 293                         goto random;
 294                 }
 295                 str = end + 1;
 296         }
 297         if (is_multicast_ether_addr(addr)) {
 298                 printk(KERN_ERR
 299                        "Attempt to assign a multicast ethernet address to a "
 300                        "device disallowed\n");
 301                 goto random;
 302         }
 303         if (!is_valid_ether_addr(addr)) {
 304                 printk(KERN_ERR
 305                        "Attempt to assign an invalid ethernet address to a "
 306                        "device disallowed\n");
 307                 goto random;
 308         }
 309         if (!is_local_ether_addr(addr)) {
 310                 printk(KERN_WARNING
 311                        "Warning: Assigning a globally valid ethernet "
 312                        "address to a device\n");
 313                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 314                        "the first byte of the MAC,\n");
 315                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 316                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 317                        addr[5]);
 318         }
 319         return;
 320
 321 random:
 322         printk(KERN_INFO
 323                "Choosing a random ethernet address for device %s\n", dev->name);
 324         eth_hw_addr_random(dev);
 325 }
 326
 327 static DEFINE_SPINLOCK(devices_lock);
 328 static LIST_HEAD(devices);
 329
 330 static struct platform_driver uml_net_driver = {
 331         .driver = {
 332                 .name  = DRIVER_NAME,
 333         },
 334 };
 335
 336 static void net_device_release(struct device *dev)
 337 {
 338         struct uml_net *device = dev_get_drvdata(dev);
 339         struct net_device *netdev = device->dev;
 340         struct uml_net_private *lp = netdev_priv(netdev);
 341
 342         if (lp->remove != NULL)
 343                 (*lp->remove)(&lp->user);
 344         list_del(&device->list);
 345         kfree(device);
 346         free_netdev(netdev);
 347 }
 348
 349 static const struct net_device_ops uml_netdev_ops = {
 350         .ndo_open               = uml_net_open,
 351         .ndo_stop               = uml_net_close,
 352         .ndo_start_xmit         = uml_net_start_xmit,
 353         .ndo_set_rx_mode        = uml_net_set_multicast_list,
 354         .ndo_tx_timeout         = uml_net_tx_timeout,
 355         .ndo_set_mac_address    = eth_mac_addr,
 356         .ndo_validate_addr      = eth_validate_addr,
 357 #ifdef CONFIG_NET_POLL_CONTROLLER
 358         .ndo_poll_controller = uml_net_poll_controller,
 359 #endif
 360 };
 361
 362 /*
 363  * Ensures that platform_driver_register is called only once by
 364  * eth_configure.  Will be set in an initcall.
 365  */
 366 static int driver_registered;
 367
 368 static void eth_configure(int n, void *init, char *mac,
 369                           struct transport *transport, gfp_t gfp_mask)
 370 {
 371         struct uml_net *device;
 372         struct net_device *dev;
 373         struct uml_net_private *lp;
 374         int err, size;
 375
 376         size = transport->private_size + sizeof(struct uml_net_private);
 377
 378         device = kzalloc(sizeof(*device), gfp_mask);
 379         if (device == NULL) {
 380                 printk(KERN_ERR "eth_configure failed to allocate struct "
 381                        "uml_net\n");
 382                 return;
 383         }
 384
 385         dev = alloc_etherdev(size);
 386         if (dev == NULL) {
 387                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 388                        "net_device for eth%d\n", n);
 389                 goto out_free_device;
 390         }
 391
 392         INIT_LIST_HEAD(&device->list);
 393         device->index = n;
 394
 395         /* If this name ends up conflicting with an existing registered
 396          * netdevice, that is OK, register_netdev{,ice}() will notice this
 397          * and fail.
 398          */
 399         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 400
 401         uml_net_setup_etheraddr(dev, mac);
 402
 403         printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
 404
 405         lp = netdev_priv(dev);
 406         /* This points to the transport private data. It's still clear, but we
 407          * must memset it to 0 *now*. Let's help the drivers. */
 408         memset(lp, 0, size);
 409         INIT_WORK(&lp->work, uml_dev_close);
 410
 411         /* sysfs register */
 412         if (!driver_registered) {
 413                 platform_driver_register(&uml_net_driver);
 414                 driver_registered = 1;
 415         }
 416         device->pdev.id = n;
 417         device->pdev.name = DRIVER_NAME;
 418         device->pdev.dev.release = net_device_release;
 419         dev_set_drvdata(&device->pdev.dev, device);
 420         if (platform_device_register(&device->pdev))
 421                 goto out_free_netdev;
 422         SET_NETDEV_DEV(dev,&device->pdev.dev);
 423
 424         device->dev = dev;
 425
 426         /*
 427          * These just fill in a data structure, so there's no failure
 428          * to be worried about.
 429          */
 430         (*transport->kern->init)(dev, init);
 431
 432         *lp = ((struct uml_net_private)
 433                 { .list                 = LIST_HEAD_INIT(lp->list),
 434                   .dev                  = dev,
 435                   .fd                   = -1,
 436                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 437                   .max_packet           = transport->user->max_packet,
 438                   .protocol             = transport->kern->protocol,
 439                   .open                 = transport->user->open,
 440                   .close                = transport->user->close,
 441                   .remove               = transport->user->remove,
 442                   .read                 = transport->kern->read,
 443                   .write                = transport->kern->write,
 444                   .add_address          = transport->user->add_address,
 445                   .delete_address       = transport->user->delete_address });
 446
 447         spin_lock_init(&lp->lock);
 448         memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
 449
 450         if ((transport->user->init != NULL) &&
 451             ((*transport->user->init)(&lp->user, dev) != 0))
 452                 goto out_unregister;
 453
 454         dev->mtu = transport->user->mtu;
 455         dev->netdev_ops = &uml_netdev_ops;
 456         dev->ethtool_ops = &uml_net_ethtool_ops;
 457         dev->watchdog_timeo = (HZ >> 1);
 458         dev->irq = UM_ETH_IRQ;
 459
 460         err = update_drop_skb(lp->max_packet);
 461         if (err)
 462                 goto out_undo_user_init;
 463
 464         rtnl_lock();
 465         err = register_netdevice(dev);
 466         rtnl_unlock();
 467         if (err)
 468                 goto out_undo_user_init;
 469
 470         spin_lock(&devices_lock);
 471         list_add(&device->list, &devices);
 472         spin_unlock(&devices_lock);
 473
 474         return;
 475
 476 out_undo_user_init:
 477         if (transport->user->remove != NULL)
 478                 (*transport->user->remove)(&lp->user);
 479 out_unregister:
 480         platform_device_unregister(&device->pdev);
 481         return; /* platform_device_unregister frees dev and device */
 482 out_free_netdev:
 483         free_netdev(dev);
 484 out_free_device:
 485         kfree(device);
 486 }
 487
 488 static struct uml_net *find_device(int n)
 489 {
 490         struct uml_net *device;
 491         struct list_head *ele;
 492
 493         spin_lock(&devices_lock);
 494         list_for_each(ele, &devices) {
 495                 device = list_entry(ele, struct uml_net, list);
 496                 if (device->index == n)
 497                         goto out;
 498         }
 499         device = NULL;
 500  out:
 501         spin_unlock(&devices_lock);
 502         return device;
 503 }
 504
 505 static int eth_parse(char *str, int *index_out, char **str_out,
 506                      char **error_out)
 507 {
 508         char *end;
 509         int n, err = -EINVAL;
 510
 511         n = simple_strtoul(str, &end, 0);
 512         if (end == str) {
 513                 *error_out = "Bad device number";
 514                 return err;
 515         }
 516
 517         str = end;
 518         if (*str != '=') {
 519                 *error_out = "Expected '=' after device number";
 520                 return err;
 521         }
 522
 523         str++;
 524         if (find_device(n)) {
 525                 *error_out = "Device already configured";
 526                 return err;
 527         }
 528
 529         *index_out = n;
 530         *str_out = str;
 531         return 0;
 532 }
 533
 534 struct eth_init {
 535         struct list_head list;
 536         char *init;
 537         int index;
 538 };
 539
 540 static DEFINE_SPINLOCK(transports_lock);
 541 static LIST_HEAD(transports);
 542
 543 /* Filled in during early boot */
 544 static LIST_HEAD(eth_cmd_line);
 545
 546 static int check_transport(struct transport *transport, char *eth, int n,
 547                            void **init_out, char **mac_out, gfp_t gfp_mask)
 548 {
 549         int len;
 550
 551         len = strlen(transport->name);
 552         if (strncmp(eth, transport->name, len))
 553                 return 0;
 554
 555         eth += len;
 556         if (*eth == ',')
 557                 eth++;
 558         else if (*eth != '\0')
 559                 return 0;
 560
 561         *init_out = kmalloc(transport->setup_size, gfp_mask);
 562         if (*init_out == NULL)
 563                 return 1;
 564
 565         if (!transport->setup(eth, mac_out, *init_out)) {
 566                 kfree(*init_out);
 567                 *init_out = NULL;
 568         }
 569         return 1;
 570 }
 571
 572 void register_transport(struct transport *new)
 573 {
 574         struct list_head *ele, *next;
 575         struct eth_init *eth;
 576         void *init;
 577         char *mac = NULL;
 578         int match;
 579
 580         spin_lock(&transports_lock);
 581         BUG_ON(!list_empty(&new->list));
 582         list_add(&new->list, &transports);
 583         spin_unlock(&transports_lock);
 584
 585         list_for_each_safe(ele, next, &eth_cmd_line) {
 586                 eth = list_entry(ele, struct eth_init, list);
 587                 match = check_transport(new, eth->init, eth->index, &init,
 588                                         &mac, GFP_KERNEL);
 589                 if (!match)
 590                         continue;
 591                 else if (init != NULL) {
 592                         eth_configure(eth->index, init, mac, new, GFP_KERNEL);
 593                         kfree(init);
 594                 }
 595                 list_del(&eth->list);
 596         }
 597 }
 598
 599 static int eth_setup_common(char *str, int index)
 600 {
 601         struct list_head *ele;
 602         struct transport *transport;
 603         void *init;
 604         char *mac = NULL;
 605         int found = 0;
 606
 607         spin_lock(&transports_lock);
 608         list_for_each(ele, &transports) {
 609                 transport = list_entry(ele, struct transport, list);
 610                 if (!check_transport(transport, str, index, &init,
 611                                         &mac, GFP_ATOMIC))
 612                         continue;
 613                 if (init != NULL) {
 614                         eth_configure(index, init, mac, transport, GFP_ATOMIC);
 615                         kfree(init);
 616                 }
 617                 found = 1;
 618                 break;
 619         }
 620
 621         spin_unlock(&transports_lock);
 622         return found;
 623 }
 624
 625 static int __init eth_setup(char *str)
 626 {
 627         struct eth_init *new;
 628         char *error;
 629         int n, err;
 630
 631         err = eth_parse(str, &n, &str, &error);
 632         if (err) {
 633                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 634                        str, error);
 635                 return 1;
 636         }
 637
 638         new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
 639         if (!new)
 640                 panic("%s: Failed to allocate %zu bytes\n", __func__,
 641                       sizeof(*new));
 642
 643         INIT_LIST_HEAD(&new->list);
 644         new->index = n;
 645         new->init = str;
 646
 647         list_add_tail(&new->list, &eth_cmd_line);
 648         return 1;
 649 }
 650
 651 __setup("eth", eth_setup);
 652 __uml_help(eth_setup,
 653 "eth[0-9]+=<transport>,<options>\n"
 654 "    Configure a network device.\n\n"
 655 );
 656
 657 static int net_config(char *str, char **error_out)
 658 {
 659         int n, err;
 660
 661         err = eth_parse(str, &n, &str, error_out);
 662         if (err)
 663                 return err;
 664
 665         /* This string is broken up and the pieces used by the underlying
 666          * driver.  So, it is freed only if eth_setup_common fails.
 667          */
 668         str = kstrdup(str, GFP_KERNEL);
 669         if (str == NULL) {
 670                 *error_out = "net_config failed to strdup string";
 671                 return -ENOMEM;
 672         }
 673         err = !eth_setup_common(str, n);
 674         if (err)
 675                 kfree(str);
 676         return err;
 677 }
 678
 679 static int net_id(char **str, int *start_out, int *end_out)
 680 {
 681         char *end;
 682         int n;
 683
 684         n = simple_strtoul(*str, &end, 0);
 685         if ((*end != '\0') || (end == *str))
 686                 return -1;
 687
 688         *start_out = n;
 689         *end_out = n;
 690         *str = end;
 691         return n;
 692 }
 693
 694 static int net_remove(int n, char **error_out)
 695 {
 696         struct uml_net *device;
 697         struct net_device *dev;
 698         struct uml_net_private *lp;
 699
 700         device = find_device(n);
 701         if (device == NULL)
 702                 return -ENODEV;
 703
 704         dev = device->dev;
 705         lp = netdev_priv(dev);
 706         if (lp->fd > 0)
 707                 return -EBUSY;
 708         unregister_netdev(dev);
 709         platform_device_unregister(&device->pdev);
 710
 711         return 0;
 712 }
 713
 714 static struct mc_device net_mc = {
 715         .list           = LIST_HEAD_INIT(net_mc.list),
 716         .name           = "eth",
 717         .config         = net_config,
 718         .get_config     = NULL,
 719         .id             = net_id,
 720         .remove         = net_remove,
 721 };
 722
 723 #ifdef CONFIG_INET
 724 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 725                               void *ptr)
 726 {
 727         struct in_ifaddr *ifa = ptr;
 728         struct net_device *dev = ifa->ifa_dev->dev;
 729         struct uml_net_private *lp;
 730         void (*proc)(unsigned char *, unsigned char *, void *);
 731         unsigned char addr_buf[4], netmask_buf[4];
 732
 733         if (dev->netdev_ops->ndo_open != uml_net_open)
 734                 return NOTIFY_DONE;
 735
 736         lp = netdev_priv(dev);
 737
 738         proc = NULL;
 739         switch (event) {
 740         case NETDEV_UP:
 741                 proc = lp->add_address;
 742                 break;
 743         case NETDEV_DOWN:
 744                 proc = lp->delete_address;
 745                 break;
 746         }
 747         if (proc != NULL) {
 748                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 749                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 750                 (*proc)(addr_buf, netmask_buf, &lp->user);
 751         }
 752         return NOTIFY_DONE;
 753 }
 754
 755 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 756 static struct notifier_block uml_inetaddr_notifier = {
 757         .notifier_call          = uml_inetaddr_event,
 758 };
 759
 760 static void inet_register(void)
 761 {
 762         struct list_head *ele;
 763         struct uml_net_private *lp;
 764         struct in_device *ip;
 765         struct in_ifaddr *in;
 766
 767         register_inetaddr_notifier(&uml_inetaddr_notifier);
 768
 769         /* Devices may have been opened already, so the uml_inetaddr_notifier
 770          * didn't get a chance to run for them.  This fakes it so that
 771          * addresses which have already been set up get handled properly.
 772          */
 773         spin_lock(&opened_lock);
 774         list_for_each(ele, &opened) {
 775                 lp = list_entry(ele, struct uml_net_private, list);
 776                 ip = lp->dev->ip_ptr;
 777                 if (ip == NULL)
 778                         continue;
 779                 in = ip->ifa_list;
 780                 while (in != NULL) {
 781                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 782                         in = in->ifa_next;
 783                 }
 784         }
 785         spin_unlock(&opened_lock);
 786 }
 787 #else
 788 static inline void inet_register(void)
 789 {
 790 }
 791 #endif
 792
 793 static int uml_net_init(void)
 794 {
 795         mconsole_register_dev(&net_mc);
 796         inet_register();
 797         return 0;
 798 }
 799
 800 __initcall(uml_net_init);
 801
 802 static void close_devices(void)
 803 {
 804         struct list_head *ele;
 805         struct uml_net_private *lp;
 806
 807         spin_lock(&opened_lock);
 808         list_for_each(ele, &opened) {
 809                 lp = list_entry(ele, struct uml_net_private, list);
 810                 um_free_irq(lp->dev->irq, lp->dev);
 811                 if ((lp->close != NULL) && (lp->fd >= 0))
 812                         (*lp->close)(lp->fd, &lp->user);
 813                 if (lp->remove != NULL)
 814                         (*lp->remove)(&lp->user);
 815         }
 816         spin_unlock(&opened_lock);
 817 }
 818
 819 __uml_exitcall(close_devices);
 820
 821 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 822                                         void *),
 823                     void *arg)
 824 {
 825         struct net_device *dev = d;
 826         struct in_device *ip = dev->ip_ptr;
 827         struct in_ifaddr *in;
 828         unsigned char address[4], netmask[4];
 829
 830         if (ip == NULL) return;
 831         in = ip->ifa_list;
 832         while (in != NULL) {
 833                 memcpy(address, &in->ifa_address, sizeof(address));
 834                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 835                 (*cb)(address, netmask, arg);
 836                 in = in->ifa_next;
 837         }
 838 }
 839
 840 int dev_netmask(void *d, void *m)
 841 {
 842         struct net_device *dev = d;
 843         struct in_device *ip = dev->ip_ptr;
 844         struct in_ifaddr *in;
 845         __be32 *mask_out = m;
 846
 847         if (ip == NULL)
 848                 return 1;
 849
 850         in = ip->ifa_list;
 851         if (in == NULL)
 852                 return 1;
 853
 854         *mask_out = in->ifa_mask;
 855         return 0;
 856 }
 857
 858 void *get_output_buffer(int *len_out)
 859 {
 860         void *ret;
 861
 862         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 863         if (ret) *len_out = PAGE_SIZE;
 864         else *len_out = 0;
 865         return ret;
 866 }
 867
 868 void free_output_buffer(void *buffer)
 869 {
 870         free_pages((unsigned long) buffer, 0);
 871 }
 872
 873 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 874                      char **gate_addr)
 875 {
 876         char *remain;
 877
 878         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 879         if (remain != NULL) {
 880                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 881                        "specification : '%s'\n", remain);
 882                 return 1;
 883         }
 884
 885         return 0;
 886 }
 887
 888 unsigned short eth_protocol(struct sk_buff *skb)
 889 {
 890         return eth_type_trans(skb, skb->dev);
 891 }