arch/um/drivers/net_kern.c

   1 /*
   2  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   4  * James Leu (jleu@mindspring.net).
   5  * Copyright (C) 2001 by various other people who didn't put their name here.
   6  * Licensed under the GPL.
   7  */
   8
   9 #include <linux/bootmem.h>
  10 #include <linux/etherdevice.h>
  11 #include <linux/ethtool.h>
  12 #include <linux/inetdevice.h>
  13 #include <linux/init.h>
  14 #include <linux/list.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/spinlock.h>
  20 #include "init.h"
  21 #include "irq_kern.h"
  22 #include "irq_user.h"
  23 #include "mconsole_kern.h"
  24 #include "net_kern.h"
  25 #include "net_user.h"
  26
  27 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
  28 {
  29         memcpy(dev->dev_addr, addr, ETH_ALEN);
  30 }
  31
  32 #define DRIVER_NAME "uml-netdev"
  33
  34 static DEFINE_SPINLOCK(opened_lock);
  35 static LIST_HEAD(opened);
  36
  37 /*
  38  * The drop_skb is used when we can't allocate an skb.  The
  39  * packet is read into drop_skb in order to get the data off the
  40  * connection to the host.
  41  * It is reallocated whenever a maximum packet size is seen which is
  42  * larger than any seen before.  update_drop_skb is called from
  43  * eth_configure when a new interface is added.
  44  */
  45 static DEFINE_SPINLOCK(drop_lock);
  46 static struct sk_buff *drop_skb;
  47 static int drop_max;
  48
  49 static int update_drop_skb(int max)
  50 {
  51         struct sk_buff *new;
  52         unsigned long flags;
  53         int err = 0;
  54
  55         spin_lock_irqsave(&drop_lock, flags);
  56
  57         if (max <= drop_max)
  58                 goto out;
  59
  60         err = -ENOMEM;
  61         new = dev_alloc_skb(max);
  62         if (new == NULL)
  63                 goto out;
  64
  65         skb_put(new, max);
  66
  67         kfree_skb(drop_skb);
  68         drop_skb = new;
  69         drop_max = max;
  70         err = 0;
  71 out:
  72         spin_unlock_irqrestore(&drop_lock, flags);
  73
  74         return err;
  75 }
  76
  77 static int uml_net_rx(struct net_device *dev)
  78 {
  79         struct uml_net_private *lp = netdev_priv(dev);
  80         int pkt_len;
  81         struct sk_buff *skb;
  82
  83         /* If we can't allocate memory, try again next round. */
  84         skb = dev_alloc_skb(lp->max_packet);
  85         if (skb == NULL) {
  86                 drop_skb->dev = dev;
  87                 /* Read a packet into drop_skb and don't do anything with it. */
  88                 (*lp->read)(lp->fd, drop_skb, lp);
  89                 dev->stats.rx_dropped++;
  90                 return 0;
  91         }
  92
  93         skb->dev = dev;
  94         skb_put(skb, lp->max_packet);
  95         skb_reset_mac_header(skb);
  96         pkt_len = (*lp->read)(lp->fd, skb, lp);
  97
  98         if (pkt_len > 0) {
  99                 skb_trim(skb, pkt_len);
 100                 skb->protocol = (*lp->protocol)(skb);
 101
 102                 dev->stats.rx_bytes += skb->len;
 103                 dev->stats.rx_packets++;
 104                 netif_rx(skb);
 105                 return pkt_len;
 106         }
 107
 108         kfree_skb(skb);
 109         return pkt_len;
 110 }
 111
 112 static void uml_dev_close(struct work_struct *work)
 113 {
 114         struct uml_net_private *lp =
 115                 container_of(work, struct uml_net_private, work);
 116         dev_close(lp->dev);
 117 }
 118
 119 static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
 120 {
 121         struct net_device *dev = dev_id;
 122         struct uml_net_private *lp = netdev_priv(dev);
 123         int err;
 124
 125         if (!netif_running(dev))
 126                 return IRQ_NONE;
 127
 128         spin_lock(&lp->lock);
 129         while ((err = uml_net_rx(dev)) > 0) ;
 130         if (err < 0) {
 131                 printk(KERN_ERR
 132                        "Device '%s' read returned %d, shutting it down\n",
 133                        dev->name, err);
 134                 /* dev_close can't be called in interrupt context, and takes
 135                  * again lp->lock.
 136                  * And dev_close() can be safely called multiple times on the
 137                  * same device, since it tests for (dev->flags & IFF_UP). So
 138                  * there's no harm in delaying the device shutdown.
 139                  * Furthermore, the workqueue will not re-enqueue an already
 140                  * enqueued work item. */
 141                 schedule_work(&lp->work);
 142                 goto out;
 143         }
 144         reactivate_fd(lp->fd, UM_ETH_IRQ);
 145
 146 out:
 147         spin_unlock(&lp->lock);
 148         return IRQ_HANDLED;
 149 }
 150
 151 static int uml_net_open(struct net_device *dev)
 152 {
 153         struct uml_net_private *lp = netdev_priv(dev);
 154         int err;
 155
 156         if (lp->fd >= 0) {
 157                 err = -ENXIO;
 158                 goto out;
 159         }
 160
 161         lp->fd = (*lp->open)(&lp->user);
 162         if (lp->fd < 0) {
 163                 err = lp->fd;
 164                 goto out;
 165         }
 166
 167         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 168                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
 169         if (err != 0) {
 170                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 171                 err = -ENETUNREACH;
 172                 goto out_close;
 173         }
 174
 175         lp->tl.data = (unsigned long) &lp->user;
 176         netif_start_queue(dev);
 177
 178         /* clear buffer - it can happen that the host side of the interface
 179          * is full when we get here.  In this case, new data is never queued,
 180          * SIGIOs never arrive, and the net never works.
 181          */
 182         while ((err = uml_net_rx(dev)) > 0) ;
 183
 184         spin_lock(&opened_lock);
 185         list_add(&lp->list, &opened);
 186         spin_unlock(&opened_lock);
 187
 188         return 0;
 189 out_close:
 190         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 191         lp->fd = -1;
 192 out:
 193         return err;
 194 }
 195
 196 static int uml_net_close(struct net_device *dev)
 197 {
 198         struct uml_net_private *lp = netdev_priv(dev);
 199
 200         netif_stop_queue(dev);
 201
 202         free_irq(dev->irq, dev);
 203         if (lp->close != NULL)
 204                 (*lp->close)(lp->fd, &lp->user);
 205         lp->fd = -1;
 206
 207         spin_lock(&opened_lock);
 208         list_del(&lp->list);
 209         spin_unlock(&opened_lock);
 210
 211         return 0;
 212 }
 213
 214 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 215 {
 216         struct uml_net_private *lp = netdev_priv(dev);
 217         unsigned long flags;
 218         int len;
 219
 220         netif_stop_queue(dev);
 221
 222         spin_lock_irqsave(&lp->lock, flags);
 223
 224         len = (*lp->write)(lp->fd, skb, lp);
 225
 226         if (len == skb->len) {
 227                 dev->stats.tx_packets++;
 228                 dev->stats.tx_bytes += skb->len;
 229                 dev->trans_start = jiffies;
 230                 netif_start_queue(dev);
 231
 232                 /* this is normally done in the interrupt when tx finishes */
 233                 netif_wake_queue(dev);
 234         }
 235         else if (len == 0) {
 236                 netif_start_queue(dev);
 237                 dev->stats.tx_dropped++;
 238         }
 239         else {
 240                 netif_start_queue(dev);
 241                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 242         }
 243
 244         spin_unlock_irqrestore(&lp->lock, flags);
 245
 246         dev_kfree_skb(skb);
 247
 248         return 0;
 249 }
 250
 251 static void uml_net_set_multicast_list(struct net_device *dev)
 252 {
 253         return;
 254 }
 255
 256 static void uml_net_tx_timeout(struct net_device *dev)
 257 {
 258         dev->trans_start = jiffies;
 259         netif_wake_queue(dev);
 260 }
 261
 262 static int uml_net_set_mac(struct net_device *dev, void *addr)
 263 {
 264         struct uml_net_private *lp = netdev_priv(dev);
 265         struct sockaddr *hwaddr = addr;
 266
 267         spin_lock_irq(&lp->lock);
 268         set_ether_mac(dev, hwaddr->sa_data);
 269         spin_unlock_irq(&lp->lock);
 270
 271         return 0;
 272 }
 273
 274 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 275 {
 276         dev->mtu = new_mtu;
 277
 278         return 0;
 279 }
 280
 281 static void uml_net_get_drvinfo(struct net_device *dev,
 282                                 struct ethtool_drvinfo *info)
 283 {
 284         strcpy(info->driver, DRIVER_NAME);
 285         strcpy(info->version, "42");
 286 }
 287
 288 static struct ethtool_ops uml_net_ethtool_ops = {
 289         .get_drvinfo    = uml_net_get_drvinfo,
 290         .get_link       = ethtool_op_get_link,
 291 };
 292
 293 static void uml_net_user_timer_expire(unsigned long _conn)
 294 {
 295 #ifdef undef
 296         struct connection *conn = (struct connection *)_conn;
 297
 298         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 299         do_connect(conn);
 300 #endif
 301 }
 302
 303 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
 304 {
 305         char *end;
 306         int i;
 307
 308         if (str == NULL)
 309                 goto random;
 310
 311         for (i = 0; i < 6; i++) {
 312                 addr[i] = simple_strtoul(str, &end, 16);
 313                 if ((end == str) ||
 314                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 315                         printk(KERN_ERR
 316                                "setup_etheraddr: failed to parse '%s' "
 317                                "as an ethernet address\n", str);
 318                         goto random;
 319                 }
 320                 str = end + 1;
 321         }
 322         if (is_multicast_ether_addr(addr)) {
 323                 printk(KERN_ERR
 324                        "Attempt to assign a multicast ethernet address to a "
 325                        "device disallowed\n");
 326                 goto random;
 327         }
 328         if (!is_valid_ether_addr(addr)) {
 329                 printk(KERN_ERR
 330                        "Attempt to assign an invalid ethernet address to a "
 331                        "device disallowed\n");
 332                 goto random;
 333         }
 334         if (!is_local_ether_addr(addr)) {
 335                 printk(KERN_WARNING
 336                        "Warning: Assigning a globally valid ethernet "
 337                        "address to a device\n");
 338                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 339                        "the first byte of the MAC,\n");
 340                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 341                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 342                        addr[5]);
 343         }
 344         return;
 345
 346 random:
 347         printk(KERN_INFO
 348                "Choosing a random ethernet address for device %s\n", name);
 349         random_ether_addr(addr);
 350 }
 351
 352 static DEFINE_SPINLOCK(devices_lock);
 353 static LIST_HEAD(devices);
 354
 355 static struct platform_driver uml_net_driver = {
 356         .driver = {
 357                 .name  = DRIVER_NAME,
 358         },
 359 };
 360
 361 static void net_device_release(struct device *dev)
 362 {
 363         struct uml_net *device = dev->driver_data;
 364         struct net_device *netdev = device->dev;
 365         struct uml_net_private *lp = netdev_priv(netdev);
 366
 367         if (lp->remove != NULL)
 368                 (*lp->remove)(&lp->user);
 369         list_del(&device->list);
 370         kfree(device);
 371         free_netdev(netdev);
 372 }
 373
 374 static const struct net_device_ops uml_netdev_ops = {
 375         .ndo_open               = uml_net_open,
 376         .ndo_stop               = uml_net_close,
 377         .ndo_start_xmit         = uml_net_start_xmit,
 378         .ndo_set_multicast_list = uml_net_set_multicast_list,
 379         .ndo_tx_timeout         = uml_net_tx_timeout,
 380         .ndo_set_mac_address    = uml_net_set_mac,
 381         .ndo_change_mtu         = uml_net_change_mtu,
 382         .ndo_set_mac_address    = eth_mac_addr,
 383         .ndo_validate_addr      = eth_validate_addr,
 384 };
 385
 386 /*
 387  * Ensures that platform_driver_register is called only once by
 388  * eth_configure.  Will be set in an initcall.
 389  */
 390 static int driver_registered;
 391
 392 static void eth_configure(int n, void *init, char *mac,
 393                           struct transport *transport)
 394 {
 395         struct uml_net *device;
 396         struct net_device *dev;
 397         struct uml_net_private *lp;
 398         int err, size;
 399
 400         size = transport->private_size + sizeof(struct uml_net_private);
 401
 402         device = kzalloc(sizeof(*device), GFP_KERNEL);
 403         if (device == NULL) {
 404                 printk(KERN_ERR "eth_configure failed to allocate struct "
 405                        "uml_net\n");
 406                 return;
 407         }
 408
 409         dev = alloc_etherdev(size);
 410         if (dev == NULL) {
 411                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 412                        "net_device for eth%d\n", n);
 413                 goto out_free_device;
 414         }
 415
 416         INIT_LIST_HEAD(&device->list);
 417         device->index = n;
 418
 419         /* If this name ends up conflicting with an existing registered
 420          * netdevice, that is OK, register_netdev{,ice}() will notice this
 421          * and fail.
 422          */
 423         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 424
 425         setup_etheraddr(mac, device->mac, dev->name);
 426
 427         printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac);
 428
 429         lp = netdev_priv(dev);
 430         /* This points to the transport private data. It's still clear, but we
 431          * must memset it to 0 *now*. Let's help the drivers. */
 432         memset(lp, 0, size);
 433         INIT_WORK(&lp->work, uml_dev_close);
 434
 435         /* sysfs register */
 436         if (!driver_registered) {
 437                 platform_driver_register(&uml_net_driver);
 438                 driver_registered = 1;
 439         }
 440         device->pdev.id = n;
 441         device->pdev.name = DRIVER_NAME;
 442         device->pdev.dev.release = net_device_release;
 443         device->pdev.dev.driver_data = device;
 444         if (platform_device_register(&device->pdev))
 445                 goto out_free_netdev;
 446         SET_NETDEV_DEV(dev,&device->pdev.dev);
 447
 448         device->dev = dev;
 449
 450         /*
 451          * These just fill in a data structure, so there's no failure
 452          * to be worried about.
 453          */
 454         (*transport->kern->init)(dev, init);
 455
 456         *lp = ((struct uml_net_private)
 457                 { .list                 = LIST_HEAD_INIT(lp->list),
 458                   .dev                  = dev,
 459                   .fd                   = -1,
 460                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 461                   .max_packet           = transport->user->max_packet,
 462                   .protocol             = transport->kern->protocol,
 463                   .open                 = transport->user->open,
 464                   .close                = transport->user->close,
 465                   .remove               = transport->user->remove,
 466                   .read                 = transport->kern->read,
 467                   .write                = transport->kern->write,
 468                   .add_address          = transport->user->add_address,
 469                   .delete_address       = transport->user->delete_address });
 470
 471         init_timer(&lp->tl);
 472         spin_lock_init(&lp->lock);
 473         lp->tl.function = uml_net_user_timer_expire;
 474         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 475
 476         if ((transport->user->init != NULL) &&
 477             ((*transport->user->init)(&lp->user, dev) != 0))
 478                 goto out_unregister;
 479
 480         set_ether_mac(dev, device->mac);
 481         dev->mtu = transport->user->mtu;
 482         dev->netdev_ops = &uml_netdev_ops;
 483         dev->ethtool_ops = &uml_net_ethtool_ops;
 484         dev->watchdog_timeo = (HZ >> 1);
 485         dev->irq = UM_ETH_IRQ;
 486
 487         err = update_drop_skb(lp->max_packet);
 488         if (err)
 489                 goto out_undo_user_init;
 490
 491         rtnl_lock();
 492         err = register_netdevice(dev);
 493         rtnl_unlock();
 494         if (err)
 495                 goto out_undo_user_init;
 496
 497         spin_lock(&devices_lock);
 498         list_add(&device->list, &devices);
 499         spin_unlock(&devices_lock);
 500
 501         return;
 502
 503 out_undo_user_init:
 504         if (transport->user->remove != NULL)
 505                 (*transport->user->remove)(&lp->user);
 506 out_unregister:
 507         platform_device_unregister(&device->pdev);
 508         return; /* platform_device_unregister frees dev and device */
 509 out_free_netdev:
 510         free_netdev(dev);
 511 out_free_device:
 512         kfree(device);
 513 }
 514
 515 static struct uml_net *find_device(int n)
 516 {
 517         struct uml_net *device;
 518         struct list_head *ele;
 519
 520         spin_lock(&devices_lock);
 521         list_for_each(ele, &devices) {
 522                 device = list_entry(ele, struct uml_net, list);
 523                 if (device->index == n)
 524                         goto out;
 525         }
 526         device = NULL;
 527  out:
 528         spin_unlock(&devices_lock);
 529         return device;
 530 }
 531
 532 static int eth_parse(char *str, int *index_out, char **str_out,
 533                      char **error_out)
 534 {
 535         char *end;
 536         int n, err = -EINVAL;;
 537
 538         n = simple_strtoul(str, &end, 0);
 539         if (end == str) {
 540                 *error_out = "Bad device number";
 541                 return err;
 542         }
 543
 544         str = end;
 545         if (*str != '=') {
 546                 *error_out = "Expected '=' after device number";
 547                 return err;
 548         }
 549
 550         str++;
 551         if (find_device(n)) {
 552                 *error_out = "Device already configured";
 553                 return err;
 554         }
 555
 556         *index_out = n;
 557         *str_out = str;
 558         return 0;
 559 }
 560
 561 struct eth_init {
 562         struct list_head list;
 563         char *init;
 564         int index;
 565 };
 566
 567 static DEFINE_SPINLOCK(transports_lock);
 568 static LIST_HEAD(transports);
 569
 570 /* Filled in during early boot */
 571 static LIST_HEAD(eth_cmd_line);
 572
 573 static int check_transport(struct transport *transport, char *eth, int n,
 574                            void **init_out, char **mac_out)
 575 {
 576         int len;
 577
 578         len = strlen(transport->name);
 579         if (strncmp(eth, transport->name, len))
 580                 return 0;
 581
 582         eth += len;
 583         if (*eth == ',')
 584                 eth++;
 585         else if (*eth != '\0')
 586                 return 0;
 587
 588         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 589         if (*init_out == NULL)
 590                 return 1;
 591
 592         if (!transport->setup(eth, mac_out, *init_out)) {
 593                 kfree(*init_out);
 594                 *init_out = NULL;
 595         }
 596         return 1;
 597 }
 598
 599 void register_transport(struct transport *new)
 600 {
 601         struct list_head *ele, *next;
 602         struct eth_init *eth;
 603         void *init;
 604         char *mac = NULL;
 605         int match;
 606
 607         spin_lock(&transports_lock);
 608         BUG_ON(!list_empty(&new->list));
 609         list_add(&new->list, &transports);
 610         spin_unlock(&transports_lock);
 611
 612         list_for_each_safe(ele, next, &eth_cmd_line) {
 613                 eth = list_entry(ele, struct eth_init, list);
 614                 match = check_transport(new, eth->init, eth->index, &init,
 615                                         &mac);
 616                 if (!match)
 617                         continue;
 618                 else if (init != NULL) {
 619                         eth_configure(eth->index, init, mac, new);
 620                         kfree(init);
 621                 }
 622                 list_del(&eth->list);
 623         }
 624 }
 625
 626 static int eth_setup_common(char *str, int index)
 627 {
 628         struct list_head *ele;
 629         struct transport *transport;
 630         void *init;
 631         char *mac = NULL;
 632         int found = 0;
 633
 634         spin_lock(&transports_lock);
 635         list_for_each(ele, &transports) {
 636                 transport = list_entry(ele, struct transport, list);
 637                 if (!check_transport(transport, str, index, &init, &mac))
 638                         continue;
 639                 if (init != NULL) {
 640                         eth_configure(index, init, mac, transport);
 641                         kfree(init);
 642                 }
 643                 found = 1;
 644                 break;
 645         }
 646
 647         spin_unlock(&transports_lock);
 648         return found;
 649 }
 650
 651 static int __init eth_setup(char *str)
 652 {
 653         struct eth_init *new;
 654         char *error;
 655         int n, err;
 656
 657         err = eth_parse(str, &n, &str, &error);
 658         if (err) {
 659                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 660                        str, error);
 661                 return 1;
 662         }
 663
 664         new = alloc_bootmem(sizeof(*new));
 665         if (new == NULL) {
 666                 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
 667                 return 1;
 668         }
 669
 670         INIT_LIST_HEAD(&new->list);
 671         new->index = n;
 672         new->init = str;
 673
 674         list_add_tail(&new->list, &eth_cmd_line);
 675         return 1;
 676 }
 677
 678 __setup("eth", eth_setup);
 679 __uml_help(eth_setup,
 680 "eth[0-9]+=<transport>,<options>\n"
 681 "    Configure a network device.\n\n"
 682 );
 683
 684 static int net_config(char *str, char **error_out)
 685 {
 686         int n, err;
 687
 688         err = eth_parse(str, &n, &str, error_out);
 689         if (err)
 690                 return err;
 691
 692         /* This string is broken up and the pieces used by the underlying
 693          * driver.  So, it is freed only if eth_setup_common fails.
 694          */
 695         str = kstrdup(str, GFP_KERNEL);
 696         if (str == NULL) {
 697                 *error_out = "net_config failed to strdup string";
 698                 return -ENOMEM;
 699         }
 700         err = !eth_setup_common(str, n);
 701         if (err)
 702                 kfree(str);
 703         return err;
 704 }
 705
 706 static int net_id(char **str, int *start_out, int *end_out)
 707 {
 708         char *end;
 709         int n;
 710
 711         n = simple_strtoul(*str, &end, 0);
 712         if ((*end != '\0') || (end == *str))
 713                 return -1;
 714
 715         *start_out = n;
 716         *end_out = n;
 717         *str = end;
 718         return n;
 719 }
 720
 721 static int net_remove(int n, char **error_out)
 722 {
 723         struct uml_net *device;
 724         struct net_device *dev;
 725         struct uml_net_private *lp;
 726
 727         device = find_device(n);
 728         if (device == NULL)
 729                 return -ENODEV;
 730
 731         dev = device->dev;
 732         lp = netdev_priv(dev);
 733         if (lp->fd > 0)
 734                 return -EBUSY;
 735         unregister_netdev(dev);
 736         platform_device_unregister(&device->pdev);
 737
 738         return 0;
 739 }
 740
 741 static struct mc_device net_mc = {
 742         .list           = LIST_HEAD_INIT(net_mc.list),
 743         .name           = "eth",
 744         .config         = net_config,
 745         .get_config     = NULL,
 746         .id             = net_id,
 747         .remove         = net_remove,
 748 };
 749
 750 #ifdef CONFIG_INET
 751 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 752                               void *ptr)
 753 {
 754         struct in_ifaddr *ifa = ptr;
 755         struct net_device *dev = ifa->ifa_dev->dev;
 756         struct uml_net_private *lp;
 757         void (*proc)(unsigned char *, unsigned char *, void *);
 758         unsigned char addr_buf[4], netmask_buf[4];
 759
 760         if (dev->netdev_ops->ndo_open != uml_net_open)
 761                 return NOTIFY_DONE;
 762
 763         lp = netdev_priv(dev);
 764
 765         proc = NULL;
 766         switch (event) {
 767         case NETDEV_UP:
 768                 proc = lp->add_address;
 769                 break;
 770         case NETDEV_DOWN:
 771                 proc = lp->delete_address;
 772                 break;
 773         }
 774         if (proc != NULL) {
 775                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 776                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 777                 (*proc)(addr_buf, netmask_buf, &lp->user);
 778         }
 779         return NOTIFY_DONE;
 780 }
 781
 782 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 783 static struct notifier_block uml_inetaddr_notifier = {
 784         .notifier_call          = uml_inetaddr_event,
 785 };
 786
 787 static void inet_register(void)
 788 {
 789         struct list_head *ele;
 790         struct uml_net_private *lp;
 791         struct in_device *ip;
 792         struct in_ifaddr *in;
 793
 794         register_inetaddr_notifier(&uml_inetaddr_notifier);
 795
 796         /* Devices may have been opened already, so the uml_inetaddr_notifier
 797          * didn't get a chance to run for them.  This fakes it so that
 798          * addresses which have already been set up get handled properly.
 799          */
 800         spin_lock(&opened_lock);
 801         list_for_each(ele, &opened) {
 802                 lp = list_entry(ele, struct uml_net_private, list);
 803                 ip = lp->dev->ip_ptr;
 804                 if (ip == NULL)
 805                         continue;
 806                 in = ip->ifa_list;
 807                 while (in != NULL) {
 808                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 809                         in = in->ifa_next;
 810                 }
 811         }
 812         spin_unlock(&opened_lock);
 813 }
 814 #else
 815 static inline void inet_register(void)
 816 {
 817 }
 818 #endif
 819
 820 static int uml_net_init(void)
 821 {
 822         mconsole_register_dev(&net_mc);
 823         inet_register();
 824         return 0;
 825 }
 826
 827 __initcall(uml_net_init);
 828
 829 static void close_devices(void)
 830 {
 831         struct list_head *ele;
 832         struct uml_net_private *lp;
 833
 834         spin_lock(&opened_lock);
 835         list_for_each(ele, &opened) {
 836                 lp = list_entry(ele, struct uml_net_private, list);
 837                 free_irq(lp->dev->irq, lp->dev);
 838                 if ((lp->close != NULL) && (lp->fd >= 0))
 839                         (*lp->close)(lp->fd, &lp->user);
 840                 if (lp->remove != NULL)
 841                         (*lp->remove)(&lp->user);
 842         }
 843         spin_unlock(&opened_lock);
 844 }
 845
 846 __uml_exitcall(close_devices);
 847
 848 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 849                                         void *),
 850                     void *arg)
 851 {
 852         struct net_device *dev = d;
 853         struct in_device *ip = dev->ip_ptr;
 854         struct in_ifaddr *in;
 855         unsigned char address[4], netmask[4];
 856
 857         if (ip == NULL) return;
 858         in = ip->ifa_list;
 859         while (in != NULL) {
 860                 memcpy(address, &in->ifa_address, sizeof(address));
 861                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 862                 (*cb)(address, netmask, arg);
 863                 in = in->ifa_next;
 864         }
 865 }
 866
 867 int dev_netmask(void *d, void *m)
 868 {
 869         struct net_device *dev = d;
 870         struct in_device *ip = dev->ip_ptr;
 871         struct in_ifaddr *in;
 872         __be32 *mask_out = m;
 873
 874         if (ip == NULL)
 875                 return 1;
 876
 877         in = ip->ifa_list;
 878         if (in == NULL)
 879                 return 1;
 880
 881         *mask_out = in->ifa_mask;
 882         return 0;
 883 }
 884
 885 void *get_output_buffer(int *len_out)
 886 {
 887         void *ret;
 888
 889         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 890         if (ret) *len_out = PAGE_SIZE;
 891         else *len_out = 0;
 892         return ret;
 893 }
 894
 895 void free_output_buffer(void *buffer)
 896 {
 897         free_pages((unsigned long) buffer, 0);
 898 }
 899
 900 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 901                      char **gate_addr)
 902 {
 903         char *remain;
 904
 905         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 906         if (remain != NULL) {
 907                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 908                        "specification : '%s'\n", remain);
 909                 return 1;
 910         }
 911
 912         return 0;
 913 }
 914
 915 unsigned short eth_protocol(struct sk_buff *skb)
 916 {
 917         return eth_type_trans(skb, skb->dev);
 918 }