kernel/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/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         reactivate_fd(lp->fd, UM_ETH_IRQ);
 141
 142 out:
 143         spin_unlock(&lp->lock);
 144         return IRQ_HANDLED;
 145 }
 146
 147 static 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;
 185 out_close:
 186         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 187         lp->fd = -1;
 188 out:
 189         return err;
 190 }
 191
 192 static 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         um_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
 210 static 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         skb_tx_timestamp(skb);
 222
 223         if (len == skb->len) {
 224                 dev->stats.tx_packets++;
 225                 dev->stats.tx_bytes += skb->len;
 226                 dev->trans_start = jiffies;
 227                 netif_start_queue(dev);
 228
 229                 /* this is normally done in the interrupt when tx finishes */
 230                 netif_wake_queue(dev);
 231         }
 232         else if (len == 0) {
 233                 netif_start_queue(dev);
 234                 dev->stats.tx_dropped++;
 235         }
 236         else {
 237                 netif_start_queue(dev);
 238                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 239         }
 240
 241         spin_unlock_irqrestore(&lp->lock, flags);
 242
 243         dev_consume_skb_any(skb);
 244
 245         return NETDEV_TX_OK;
 246 }
 247
 248 static void uml_net_set_multicast_list(struct net_device *dev)
 249 {
 250         return;
 251 }
 252
 253 static void uml_net_tx_timeout(struct net_device *dev)
 254 {
 255         dev->trans_start = jiffies;
 256         netif_wake_queue(dev);
 257 }
 258
 259 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 260 {
 261         dev->mtu = new_mtu;
 262
 263         return 0;
 264 }
 265
 266 #ifdef CONFIG_NET_POLL_CONTROLLER
 267 static void uml_net_poll_controller(struct net_device *dev)
 268 {
 269         disable_irq(dev->irq);
 270         uml_net_interrupt(dev->irq, dev);
 271         enable_irq(dev->irq);
 272 }
 273 #endif
 274
 275 static void uml_net_get_drvinfo(struct net_device *dev,
 276                                 struct ethtool_drvinfo *info)
 277 {
 278         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 279         strlcpy(info->version, "42", sizeof(info->version));
 280 }
 281
 282 static const struct ethtool_ops uml_net_ethtool_ops = {
 283         .get_drvinfo    = uml_net_get_drvinfo,
 284         .get_link       = ethtool_op_get_link,
 285         .get_ts_info    = ethtool_op_get_ts_info,
 286 };
 287
 288 static void uml_net_user_timer_expire(unsigned long _conn)
 289 {
 290 #ifdef undef
 291         struct connection *conn = (struct connection *)_conn;
 292
 293         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 294         do_connect(conn);
 295 #endif
 296 }
 297
 298 static void setup_etheraddr(struct net_device *dev, char *str)
 299 {
 300         unsigned char *addr = dev->dev_addr;
 301         char *end;
 302         int i;
 303
 304         if (str == NULL)
 305                 goto random;
 306
 307         for (i = 0; i < 6; i++) {
 308                 addr[i] = simple_strtoul(str, &end, 16);
 309                 if ((end == str) ||
 310                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
 311                         printk(KERN_ERR
 312                                "setup_etheraddr: failed to parse '%s' "
 313                                "as an ethernet address\n", str);
 314                         goto random;
 315                 }
 316                 str = end + 1;
 317         }
 318         if (is_multicast_ether_addr(addr)) {
 319                 printk(KERN_ERR
 320                        "Attempt to assign a multicast ethernet address to a "
 321                        "device disallowed\n");
 322                 goto random;
 323         }
 324         if (!is_valid_ether_addr(addr)) {
 325                 printk(KERN_ERR
 326                        "Attempt to assign an invalid ethernet address to a "
 327                        "device disallowed\n");
 328                 goto random;
 329         }
 330         if (!is_local_ether_addr(addr)) {
 331                 printk(KERN_WARNING
 332                        "Warning: Assigning a globally valid ethernet "
 333                        "address to a device\n");
 334                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
 335                        "the first byte of the MAC,\n");
 336                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 337                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 338                        addr[5]);
 339         }
 340         return;
 341
 342 random:
 343         printk(KERN_INFO
 344                "Choosing a random ethernet address for device %s\n", dev->name);
 345         eth_hw_addr_random(dev);
 346 }
 347
 348 static DEFINE_SPINLOCK(devices_lock);
 349 static LIST_HEAD(devices);
 350
 351 static struct platform_driver uml_net_driver = {
 352         .driver = {
 353                 .name  = DRIVER_NAME,
 354         },
 355 };
 356
 357 static void net_device_release(struct device *dev)
 358 {
 359         struct uml_net *device = dev_get_drvdata(dev);
 360         struct net_device *netdev = device->dev;
 361         struct uml_net_private *lp = netdev_priv(netdev);
 362
 363         if (lp->remove != NULL)
 364                 (*lp->remove)(&lp->user);
 365         list_del(&device->list);
 366         kfree(device);
 367         free_netdev(netdev);
 368 }
 369
 370 static const struct net_device_ops uml_netdev_ops = {
 371         .ndo_open               = uml_net_open,
 372         .ndo_stop               = uml_net_close,
 373         .ndo_start_xmit         = uml_net_start_xmit,
 374         .ndo_set_rx_mode        = uml_net_set_multicast_list,
 375         .ndo_tx_timeout         = uml_net_tx_timeout,
 376         .ndo_set_mac_address    = eth_mac_addr,
 377         .ndo_change_mtu         = uml_net_change_mtu,
 378         .ndo_validate_addr      = eth_validate_addr,
 379 #ifdef CONFIG_NET_POLL_CONTROLLER
 380         .ndo_poll_controller = uml_net_poll_controller,
 381 #endif
 382 };
 383
 384 /*
 385  * Ensures that platform_driver_register is called only once by
 386  * eth_configure.  Will be set in an initcall.
 387  */
 388 static int driver_registered;
 389
 390 static void eth_configure(int n, void *init, char *mac,
 391                           struct transport *transport)
 392 {
 393         struct uml_net *device;
 394         struct net_device *dev;
 395         struct uml_net_private *lp;
 396         int err, size;
 397
 398         size = transport->private_size + sizeof(struct uml_net_private);
 399
 400         device = kzalloc(sizeof(*device), GFP_KERNEL);
 401         if (device == NULL) {
 402                 printk(KERN_ERR "eth_configure failed to allocate struct "
 403                        "uml_net\n");
 404                 return;
 405         }
 406
 407         dev = alloc_etherdev(size);
 408         if (dev == NULL) {
 409                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 410                        "net_device for eth%d\n", n);
 411                 goto out_free_device;
 412         }
 413
 414         INIT_LIST_HEAD(&device->list);
 415         device->index = n;
 416
 417         /* If this name ends up conflicting with an existing registered
 418          * netdevice, that is OK, register_netdev{,ice}() will notice this
 419          * and fail.
 420          */
 421         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 422
 423         setup_etheraddr(dev, mac);
 424
 425         printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
 426
 427         lp = netdev_priv(dev);
 428         /* This points to the transport private data. It's still clear, but we
 429          * must memset it to 0 *now*. Let's help the drivers. */
 430         memset(lp, 0, size);
 431         INIT_WORK(&lp->work, uml_dev_close);
 432
 433         /* sysfs register */
 434         if (!driver_registered) {
 435                 platform_driver_register(&uml_net_driver);
 436                 driver_registered = 1;
 437         }
 438         device->pdev.id = n;
 439         device->pdev.name = DRIVER_NAME;
 440         device->pdev.dev.release = net_device_release;
 441         dev_set_drvdata(&device->pdev.dev, device);
 442         if (platform_device_register(&device->pdev))
 443                 goto out_free_netdev;
 444         SET_NETDEV_DEV(dev,&device->pdev.dev);
 445
 446         device->dev = dev;
 447
 448         /*
 449          * These just fill in a data structure, so there's no failure
 450          * to be worried about.
 451          */
 452         (*transport->kern->init)(dev, init);
 453
 454         *lp = ((struct uml_net_private)
 455                 { .list                 = LIST_HEAD_INIT(lp->list),
 456                   .dev                  = dev,
 457                   .fd                   = -1,
 458                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 459                   .max_packet           = transport->user->max_packet,
 460                   .protocol             = transport->kern->protocol,
 461                   .open                 = transport->user->open,
 462                   .close                = transport->user->close,
 463                   .remove               = transport->user->remove,
 464                   .read                 = transport->kern->read,
 465                   .write                = transport->kern->write,
 466                   .add_address          = transport->user->add_address,
 467                   .delete_address       = transport->user->delete_address });
 468
 469         init_timer(&lp->tl);
 470         spin_lock_init(&lp->lock);
 471         lp->tl.function = uml_net_user_timer_expire;
 472         memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
 473
 474         if ((transport->user->init != NULL) &&
 475             ((*transport->user->init)(&lp->user, dev) != 0))
 476                 goto out_unregister;
 477
 478         dev->mtu = transport->user->mtu;
 479         dev->netdev_ops = &uml_netdev_ops;
 480         dev->ethtool_ops = &uml_net_ethtool_ops;
 481         dev->watchdog_timeo = (HZ >> 1);
 482         dev->irq = UM_ETH_IRQ;
 483
 484         err = update_drop_skb(lp->max_packet);
 485         if (err)
 486                 goto out_undo_user_init;
 487
 488         rtnl_lock();
 489         err = register_netdevice(dev);
 490         rtnl_unlock();
 491         if (err)
 492                 goto out_undo_user_init;
 493
 494         spin_lock(&devices_lock);
 495         list_add(&device->list, &devices);
 496         spin_unlock(&devices_lock);
 497
 498         return;
 499
 500 out_undo_user_init:
 501         if (transport->user->remove != NULL)
 502                 (*transport->user->remove)(&lp->user);
 503 out_unregister:
 504         platform_device_unregister(&device->pdev);
 505         return; /* platform_device_unregister frees dev and device */
 506 out_free_netdev:
 507         free_netdev(dev);
 508 out_free_device:
 509         kfree(device);
 510 }
 511
 512 static struct uml_net *find_device(int n)
 513 {
 514         struct uml_net *device;
 515         struct list_head *ele;
 516
 517         spin_lock(&devices_lock);
 518         list_for_each(ele, &devices) {
 519                 device = list_entry(ele, struct uml_net, list);
 520                 if (device->index == n)
 521                         goto out;
 522         }
 523         device = NULL;
 524  out:
 525         spin_unlock(&devices_lock);
 526         return device;
 527 }
 528
 529 static int eth_parse(char *str, int *index_out, char **str_out,
 530                      char **error_out)
 531 {
 532         char *end;
 533         int n, err = -EINVAL;
 534
 535         n = simple_strtoul(str, &end, 0);
 536         if (end == str) {
 537                 *error_out = "Bad device number";
 538                 return err;
 539         }
 540
 541         str = end;
 542         if (*str != '=') {
 543                 *error_out = "Expected '=' after device number";
 544                 return err;
 545         }
 546
 547         str++;
 548         if (find_device(n)) {
 549                 *error_out = "Device already configured";
 550                 return err;
 551         }
 552
 553         *index_out = n;
 554         *str_out = str;
 555         return 0;
 556 }
 557
 558 struct eth_init {
 559         struct list_head list;
 560         char *init;
 561         int index;
 562 };
 563
 564 static DEFINE_SPINLOCK(transports_lock);
 565 static LIST_HEAD(transports);
 566
 567 /* Filled in during early boot */
 568 static LIST_HEAD(eth_cmd_line);
 569
 570 static int check_transport(struct transport *transport, char *eth, int n,
 571                            void **init_out, char **mac_out)
 572 {
 573         int len;
 574
 575         len = strlen(transport->name);
 576         if (strncmp(eth, transport->name, len))
 577                 return 0;
 578
 579         eth += len;
 580         if (*eth == ',')
 581                 eth++;
 582         else if (*eth != '\0')
 583                 return 0;
 584
 585         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 586         if (*init_out == NULL)
 587                 return 1;
 588
 589         if (!transport->setup(eth, mac_out, *init_out)) {
 590                 kfree(*init_out);
 591                 *init_out = NULL;
 592         }
 593         return 1;
 594 }
 595
 596 void register_transport(struct transport *new)
 597 {
 598         struct list_head *ele, *next;
 599         struct eth_init *eth;
 600         void *init;
 601         char *mac = NULL;
 602         int match;
 603
 604         spin_lock(&transports_lock);
 605         BUG_ON(!list_empty(&new->list));
 606         list_add(&new->list, &transports);
 607         spin_unlock(&transports_lock);
 608
 609         list_for_each_safe(ele, next, &eth_cmd_line) {
 610                 eth = list_entry(ele, struct eth_init, list);
 611                 match = check_transport(new, eth->init, eth->index, &init,
 612                                         &mac);
 613                 if (!match)
 614                         continue;
 615                 else if (init != NULL) {
 616                         eth_configure(eth->index, init, mac, new);
 617                         kfree(init);
 618                 }
 619                 list_del(&eth->list);
 620         }
 621 }
 622
 623 static int eth_setup_common(char *str, int index)
 624 {
 625         struct list_head *ele;
 626         struct transport *transport;
 627         void *init;
 628         char *mac = NULL;
 629         int found = 0;
 630
 631         spin_lock(&transports_lock);
 632         list_for_each(ele, &transports) {
 633                 transport = list_entry(ele, struct transport, list);
 634                 if (!check_transport(transport, str, index, &init, &mac))
 635                         continue;
 636                 if (init != NULL) {
 637                         eth_configure(index, init, mac, transport);
 638                         kfree(init);
 639                 }
 640                 found = 1;
 641                 break;
 642         }
 643
 644         spin_unlock(&transports_lock);
 645         return found;
 646 }
 647
 648 static int __init eth_setup(char *str)
 649 {
 650         struct eth_init *new;
 651         char *error;
 652         int n, err;
 653
 654         err = eth_parse(str, &n, &str, &error);
 655         if (err) {
 656                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 657                        str, error);
 658                 return 1;
 659         }
 660
 661         new = alloc_bootmem(sizeof(*new));
 662
 663         INIT_LIST_HEAD(&new->list);
 664         new->index = n;
 665         new->init = str;
 666
 667         list_add_tail(&new->list, &eth_cmd_line);
 668         return 1;
 669 }
 670
 671 __setup("eth", eth_setup);
 672 __uml_help(eth_setup,
 673 "eth[0-9]+=<transport>,<options>\n"
 674 "    Configure a network device.\n\n"
 675 );
 676
 677 static int net_config(char *str, char **error_out)
 678 {
 679         int n, err;
 680
 681         err = eth_parse(str, &n, &str, error_out);
 682         if (err)
 683                 return err;
 684
 685         /* This string is broken up and the pieces used by the underlying
 686          * driver.  So, it is freed only if eth_setup_common fails.
 687          */
 688         str = kstrdup(str, GFP_KERNEL);
 689         if (str == NULL) {
 690                 *error_out = "net_config failed to strdup string";
 691                 return -ENOMEM;
 692         }
 693         err = !eth_setup_common(str, n);
 694         if (err)
 695                 kfree(str);
 696         return err;
 697 }
 698
 699 static int net_id(char **str, int *start_out, int *end_out)
 700 {
 701         char *end;
 702         int n;
 703
 704         n = simple_strtoul(*str, &end, 0);
 705         if ((*end != '\0') || (end == *str))
 706                 return -1;
 707
 708         *start_out = n;
 709         *end_out = n;
 710         *str = end;
 711         return n;
 712 }
 713
 714 static int net_remove(int n, char **error_out)
 715 {
 716         struct uml_net *device;
 717         struct net_device *dev;
 718         struct uml_net_private *lp;
 719
 720         device = find_device(n);
 721         if (device == NULL)
 722                 return -ENODEV;
 723
 724         dev = device->dev;
 725         lp = netdev_priv(dev);
 726         if (lp->fd > 0)
 727                 return -EBUSY;
 728         unregister_netdev(dev);
 729         platform_device_unregister(&device->pdev);
 730
 731         return 0;
 732 }
 733
 734 static struct mc_device net_mc = {
 735         .list           = LIST_HEAD_INIT(net_mc.list),
 736         .name           = "eth",
 737         .config         = net_config,
 738         .get_config     = NULL,
 739         .id             = net_id,
 740         .remove         = net_remove,
 741 };
 742
 743 #ifdef CONFIG_INET
 744 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 745                               void *ptr)
 746 {
 747         struct in_ifaddr *ifa = ptr;
 748         struct net_device *dev = ifa->ifa_dev->dev;
 749         struct uml_net_private *lp;
 750         void (*proc)(unsigned char *, unsigned char *, void *);
 751         unsigned char addr_buf[4], netmask_buf[4];
 752
 753         if (dev->netdev_ops->ndo_open != uml_net_open)
 754                 return NOTIFY_DONE;
 755
 756         lp = netdev_priv(dev);
 757
 758         proc = NULL;
 759         switch (event) {
 760         case NETDEV_UP:
 761                 proc = lp->add_address;
 762                 break;
 763         case NETDEV_DOWN:
 764                 proc = lp->delete_address;
 765                 break;
 766         }
 767         if (proc != NULL) {
 768                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 769                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 770                 (*proc)(addr_buf, netmask_buf, &lp->user);
 771         }
 772         return NOTIFY_DONE;
 773 }
 774
 775 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 776 static struct notifier_block uml_inetaddr_notifier = {
 777         .notifier_call          = uml_inetaddr_event,
 778 };
 779
 780 static void inet_register(void)
 781 {
 782         struct list_head *ele;
 783         struct uml_net_private *lp;
 784         struct in_device *ip;
 785         struct in_ifaddr *in;
 786
 787         register_inetaddr_notifier(&uml_inetaddr_notifier);
 788
 789         /* Devices may have been opened already, so the uml_inetaddr_notifier
 790          * didn't get a chance to run for them.  This fakes it so that
 791          * addresses which have already been set up get handled properly.
 792          */
 793         spin_lock(&opened_lock);
 794         list_for_each(ele, &opened) {
 795                 lp = list_entry(ele, struct uml_net_private, list);
 796                 ip = lp->dev->ip_ptr;
 797                 if (ip == NULL)
 798                         continue;
 799                 in = ip->ifa_list;
 800                 while (in != NULL) {
 801                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 802                         in = in->ifa_next;
 803                 }
 804         }
 805         spin_unlock(&opened_lock);
 806 }
 807 #else
 808 static inline void inet_register(void)
 809 {
 810 }
 811 #endif
 812
 813 static int uml_net_init(void)
 814 {
 815         mconsole_register_dev(&net_mc);
 816         inet_register();
 817         return 0;
 818 }
 819
 820 __initcall(uml_net_init);
 821
 822 static void close_devices(void)
 823 {
 824         struct list_head *ele;
 825         struct uml_net_private *lp;
 826
 827         spin_lock(&opened_lock);
 828         list_for_each(ele, &opened) {
 829                 lp = list_entry(ele, struct uml_net_private, list);
 830                 um_free_irq(lp->dev->irq, lp->dev);
 831                 if ((lp->close != NULL) && (lp->fd >= 0))
 832                         (*lp->close)(lp->fd, &lp->user);
 833                 if (lp->remove != NULL)
 834                         (*lp->remove)(&lp->user);
 835         }
 836         spin_unlock(&opened_lock);
 837 }
 838
 839 __uml_exitcall(close_devices);
 840
 841 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 842                                         void *),
 843                     void *arg)
 844 {
 845         struct net_device *dev = d;
 846         struct in_device *ip = dev->ip_ptr;
 847         struct in_ifaddr *in;
 848         unsigned char address[4], netmask[4];
 849
 850         if (ip == NULL) return;
 851         in = ip->ifa_list;
 852         while (in != NULL) {
 853                 memcpy(address, &in->ifa_address, sizeof(address));
 854                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 855                 (*cb)(address, netmask, arg);
 856                 in = in->ifa_next;
 857         }
 858 }
 859
 860 int dev_netmask(void *d, void *m)
 861 {
 862         struct net_device *dev = d;
 863         struct in_device *ip = dev->ip_ptr;
 864         struct in_ifaddr *in;
 865         __be32 *mask_out = m;
 866
 867         if (ip == NULL)
 868                 return 1;
 869
 870         in = ip->ifa_list;
 871         if (in == NULL)
 872                 return 1;
 873
 874         *mask_out = in->ifa_mask;
 875         return 0;
 876 }
 877
 878 void *get_output_buffer(int *len_out)
 879 {
 880         void *ret;
 881
 882         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 883         if (ret) *len_out = PAGE_SIZE;
 884         else *len_out = 0;
 885         return ret;
 886 }
 887
 888 void free_output_buffer(void *buffer)
 889 {
 890         free_pages((unsigned long) buffer, 0);
 891 }
 892
 893 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 894                      char **gate_addr)
 895 {
 896         char *remain;
 897
 898         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 899         if (remain != NULL) {
 900                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
 901                        "specification : '%s'\n", remain);
 902                 return 1;
 903         }
 904
 905         return 0;
 906 }
 907
 908 unsigned short eth_protocol(struct sk_buff *skb)
 909 {
 910         return eth_type_trans(skb, skb->dev);
 911 }