arch/um/drivers/net_kern.c

   1 /*
   2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   3  * James Leu (jleu@mindspring.net).
   4  * Copyright (C) 2001 by various other people who didn't put their name here.
   5  * Licensed under the GPL.
   6  */
   7
   8 #include "linux/kernel.h"
   9 #include "linux/netdevice.h"
  10 #include "linux/rtnetlink.h"
  11 #include "linux/skbuff.h"
  12 #include "linux/socket.h"
  13 #include "linux/spinlock.h"
  14 #include "linux/module.h"
  15 #include "linux/init.h"
  16 #include "linux/etherdevice.h"
  17 #include "linux/list.h"
  18 #include "linux/inetdevice.h"
  19 #include "linux/ctype.h"
  20 #include "linux/bootmem.h"
  21 #include "linux/ethtool.h"
  22 #include "linux/platform_device.h"
  23 #include "asm/uaccess.h"
  24 #include "kern_util.h"
  25 #include "net_kern.h"
  26 #include "net_user.h"
  27 #include "mconsole_kern.h"
  28 #include "init.h"
  29 #include "irq_user.h"
  30 #include "irq_kern.h"
  31
  32 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
  33 {
  34         memcpy(dev->dev_addr, addr, ETH_ALEN);
  35 }
  36
  37 #define DRIVER_NAME "uml-netdev"
  38
  39 static DEFINE_SPINLOCK(opened_lock);
  40 static LIST_HEAD(opened);
  41
  42 static int uml_net_rx(struct net_device *dev)
  43 {
  44         struct uml_net_private *lp = dev->priv;
  45         int pkt_len;
  46         struct sk_buff *skb;
  47
  48         /* If we can't allocate memory, try again next round. */
  49         skb = dev_alloc_skb(dev->mtu);
  50         if (skb == NULL) {
  51                 lp->stats.rx_dropped++;
  52                 return 0;
  53         }
  54
  55         skb->dev = dev;
  56         skb_put(skb, dev->mtu);
  57         skb_reset_mac_header(skb);
  58         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  59
  60         if (pkt_len > 0) {
  61                 skb_trim(skb, pkt_len);
  62                 skb->protocol = (*lp->protocol)(skb);
  63                 netif_rx(skb);
  64
  65                 lp->stats.rx_bytes += skb->len;
  66                 lp->stats.rx_packets++;
  67                 return pkt_len;
  68         }
  69
  70         kfree_skb(skb);
  71         return pkt_len;
  72 }
  73
  74 static void uml_dev_close(struct work_struct *work)
  75 {
  76         struct uml_net_private *lp =
  77                 container_of(work, struct uml_net_private, work);
  78         dev_close(lp->dev);
  79 }
  80
  81 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
  82 {
  83         struct net_device *dev = dev_id;
  84         struct uml_net_private *lp = dev->priv;
  85         int err;
  86
  87         if(!netif_running(dev))
  88                 return(IRQ_NONE);
  89
  90         spin_lock(&lp->lock);
  91         while((err = uml_net_rx(dev)) > 0) ;
  92         if(err < 0) {
  93                 printk(KERN_ERR
  94                        "Device '%s' read returned %d, shutting it down\n",
  95                        dev->name, err);
  96                 /* dev_close can't be called in interrupt context, and takes
  97                  * again lp->lock.
  98                  * And dev_close() can be safely called multiple times on the
  99                  * same device, since it tests for (dev->flags & IFF_UP). So
 100                  * there's no harm in delaying the device shutdown.
 101                  * Furthermore, the workqueue will not re-enqueue an already
 102                  * enqueued work item. */
 103                 schedule_work(&lp->work);
 104                 goto out;
 105         }
 106         reactivate_fd(lp->fd, UM_ETH_IRQ);
 107
 108 out:
 109         spin_unlock(&lp->lock);
 110         return IRQ_HANDLED;
 111 }
 112
 113 static int uml_net_open(struct net_device *dev)
 114 {
 115         struct uml_net_private *lp = dev->priv;
 116         int err;
 117
 118         if(lp->fd >= 0){
 119                 err = -ENXIO;
 120                 goto out;
 121         }
 122
 123         lp->fd = (*lp->open)(&lp->user);
 124         if(lp->fd < 0){
 125                 err = lp->fd;
 126                 goto out;
 127         }
 128
 129         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 130                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
 131         if(err != 0){
 132                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 133                 err = -ENETUNREACH;
 134                 goto out_close;
 135         }
 136
 137         lp->tl.data = (unsigned long) &lp->user;
 138         netif_start_queue(dev);
 139
 140         /* clear buffer - it can happen that the host side of the interface
 141          * is full when we get here.  In this case, new data is never queued,
 142          * SIGIOs never arrive, and the net never works.
 143          */
 144         while((err = uml_net_rx(dev)) > 0) ;
 145
 146         spin_lock(&opened_lock);
 147         list_add(&lp->list, &opened);
 148         spin_unlock(&opened_lock);
 149
 150         return 0;
 151 out_close:
 152         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 153         lp->fd = -1;
 154 out:
 155         return err;
 156 }
 157
 158 static int uml_net_close(struct net_device *dev)
 159 {
 160         struct uml_net_private *lp = dev->priv;
 161
 162         netif_stop_queue(dev);
 163
 164         free_irq(dev->irq, dev);
 165         if(lp->close != NULL)
 166                 (*lp->close)(lp->fd, &lp->user);
 167         lp->fd = -1;
 168
 169         spin_lock(&opened_lock);
 170         list_del(&lp->list);
 171         spin_unlock(&opened_lock);
 172
 173         return 0;
 174 }
 175
 176 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 177 {
 178         struct uml_net_private *lp = dev->priv;
 179         unsigned long flags;
 180         int len;
 181
 182         netif_stop_queue(dev);
 183
 184         spin_lock_irqsave(&lp->lock, flags);
 185
 186         len = (*lp->write)(lp->fd, &skb, lp);
 187
 188         if(len == skb->len) {
 189                 lp->stats.tx_packets++;
 190                 lp->stats.tx_bytes += skb->len;
 191                 dev->trans_start = jiffies;
 192                 netif_start_queue(dev);
 193
 194                 /* this is normally done in the interrupt when tx finishes */
 195                 netif_wake_queue(dev);
 196         }
 197         else if(len == 0){
 198                 netif_start_queue(dev);
 199                 lp->stats.tx_dropped++;
 200         }
 201         else {
 202                 netif_start_queue(dev);
 203                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 204         }
 205
 206         spin_unlock_irqrestore(&lp->lock, flags);
 207
 208         dev_kfree_skb(skb);
 209
 210         return 0;
 211 }
 212
 213 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 214 {
 215         struct uml_net_private *lp = dev->priv;
 216         return &lp->stats;
 217 }
 218
 219 static void uml_net_set_multicast_list(struct net_device *dev)
 220 {
 221         if (dev->flags & IFF_PROMISC) return;
 222         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 223         else dev->flags &= ~IFF_ALLMULTI;
 224 }
 225
 226 static void uml_net_tx_timeout(struct net_device *dev)
 227 {
 228         dev->trans_start = jiffies;
 229         netif_wake_queue(dev);
 230 }
 231
 232 static int uml_net_set_mac(struct net_device *dev, void *addr)
 233 {
 234         struct uml_net_private *lp = dev->priv;
 235         struct sockaddr *hwaddr = addr;
 236
 237         spin_lock_irq(&lp->lock);
 238         set_ether_mac(dev, hwaddr->sa_data);
 239         spin_unlock_irq(&lp->lock);
 240
 241         return 0;
 242 }
 243
 244 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 245 {
 246         struct uml_net_private *lp = dev->priv;
 247         int err = 0;
 248
 249         spin_lock_irq(&lp->lock);
 250
 251         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 252         if(new_mtu < 0){
 253                 err = new_mtu;
 254                 goto out;
 255         }
 256
 257         dev->mtu = new_mtu;
 258
 259  out:
 260         spin_unlock_irq(&lp->lock);
 261         return err;
 262 }
 263
 264 static void uml_net_get_drvinfo(struct net_device *dev,
 265                                 struct ethtool_drvinfo *info)
 266 {
 267         strcpy(info->driver, DRIVER_NAME);
 268         strcpy(info->version, "42");
 269 }
 270
 271 static struct ethtool_ops uml_net_ethtool_ops = {
 272         .get_drvinfo    = uml_net_get_drvinfo,
 273         .get_link       = ethtool_op_get_link,
 274 };
 275
 276 void uml_net_user_timer_expire(unsigned long _conn)
 277 {
 278 #ifdef undef
 279         struct connection *conn = (struct connection *)_conn;
 280
 281         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 282         do_connect(conn);
 283 #endif
 284 }
 285
 286 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
 287 {
 288         char *end;
 289         int i;
 290
 291         if(str == NULL)
 292                 goto random;
 293
 294         for(i=0;i<6;i++){
 295                 addr[i] = simple_strtoul(str, &end, 16);
 296                 if((end == str) ||
 297                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 298                         printk(KERN_ERR
 299                                "setup_etheraddr: failed to parse '%s' "
 300                                "as an ethernet address\n", str);
 301                         goto random;
 302                 }
 303                 str = end + 1;
 304         }
 305         if (is_multicast_ether_addr(addr)) {
 306                 printk(KERN_ERR
 307                        "Attempt to assign a multicast ethernet address to a "
 308                        "device disallowed\n");
 309                 goto random;
 310         }
 311         if (!is_valid_ether_addr(addr)) {
 312                 printk(KERN_ERR
 313                        "Attempt to assign an invalid ethernet address to a "
 314                        "device disallowed\n");
 315                 goto random;
 316         }
 317         if (!is_local_ether_addr(addr)) {
 318                 printk(KERN_WARNING
 319                        "Warning: attempt to assign a globally valid ethernet "
 320                        "address to a device\n");
 321                 printk(KERN_WARNING "You should better enable the 2nd "
 322                        "rightmost bit in the first byte of the MAC,\n");
 323                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
 324                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
 325                        addr[5]);
 326                 goto random;
 327         }
 328         return;
 329
 330 random:
 331         printk(KERN_INFO
 332                "Choosing a random ethernet address for device %s\n", name);
 333         random_ether_addr(addr);
 334 }
 335
 336 static DEFINE_SPINLOCK(devices_lock);
 337 static LIST_HEAD(devices);
 338
 339 static struct platform_driver uml_net_driver = {
 340         .driver = {
 341                 .name  = DRIVER_NAME,
 342         },
 343 };
 344 static int driver_registered;
 345
 346 static void net_device_release(struct device *dev)
 347 {
 348         struct uml_net *device = dev->driver_data;
 349         struct net_device *netdev = device->dev;
 350         struct uml_net_private *lp = netdev->priv;
 351
 352         if(lp->remove != NULL)
 353                 (*lp->remove)(&lp->user);
 354         list_del(&device->list);
 355         kfree(device);
 356         free_netdev(netdev);
 357 }
 358
 359 static void eth_configure(int n, void *init, char *mac,
 360                           struct transport *transport)
 361 {
 362         struct uml_net *device;
 363         struct net_device *dev;
 364         struct uml_net_private *lp;
 365         int err, size;
 366
 367         size = transport->private_size + sizeof(struct uml_net_private);
 368
 369         device = kzalloc(sizeof(*device), GFP_KERNEL);
 370         if (device == NULL) {
 371                 printk(KERN_ERR "eth_configure failed to allocate struct "
 372                        "uml_net\n");
 373                 return;
 374         }
 375
 376         dev = alloc_etherdev(size);
 377         if (dev == NULL) {
 378                 printk(KERN_ERR "eth_configure: failed to allocate struct "
 379                        "net_device for eth%d\n", n);
 380                 goto out_free_device;
 381         }
 382
 383         INIT_LIST_HEAD(&device->list);
 384         device->index = n;
 385
 386         /* If this name ends up conflicting with an existing registered
 387          * netdevice, that is OK, register_netdev{,ice}() will notice this
 388          * and fail.
 389          */
 390         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 391
 392         setup_etheraddr(mac, device->mac, dev->name);
 393
 394         printk(KERN_INFO "Netdevice %d ", n);
 395         printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 396                device->mac[0], device->mac[1],
 397                device->mac[2], device->mac[3],
 398                device->mac[4], device->mac[5]);
 399         printk(": ");
 400
 401         lp = dev->priv;
 402         /* This points to the transport private data. It's still clear, but we
 403          * must memset it to 0 *now*. Let's help the drivers. */
 404         memset(lp, 0, size);
 405         INIT_WORK(&lp->work, uml_dev_close);
 406
 407         /* sysfs register */
 408         if (!driver_registered) {
 409                 platform_driver_register(&uml_net_driver);
 410                 driver_registered = 1;
 411         }
 412         device->pdev.id = n;
 413         device->pdev.name = DRIVER_NAME;
 414         device->pdev.dev.release = net_device_release;
 415         device->pdev.dev.driver_data = device;
 416         if(platform_device_register(&device->pdev))
 417                 goto out_free_netdev;
 418         SET_NETDEV_DEV(dev,&device->pdev.dev);
 419
 420         device->dev = dev;
 421
 422         /*
 423          * These just fill in a data structure, so there's no failure
 424          * to be worried about.
 425          */
 426         (*transport->kern->init)(dev, init);
 427
 428         *lp = ((struct uml_net_private)
 429                 { .list                 = LIST_HEAD_INIT(lp->list),
 430                   .dev                  = dev,
 431                   .fd                   = -1,
 432                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 433                   .protocol             = transport->kern->protocol,
 434                   .open                 = transport->user->open,
 435                   .close                = transport->user->close,
 436                   .remove               = transport->user->remove,
 437                   .read                 = transport->kern->read,
 438                   .write                = transport->kern->write,
 439                   .add_address          = transport->user->add_address,
 440                   .delete_address       = transport->user->delete_address,
 441                   .set_mtu              = transport->user->set_mtu });
 442
 443         init_timer(&lp->tl);
 444         spin_lock_init(&lp->lock);
 445         lp->tl.function = uml_net_user_timer_expire;
 446         memcpy(lp->mac, device->mac, sizeof(lp->mac));
 447
 448         if ((transport->user->init != NULL) &&
 449             ((*transport->user->init)(&lp->user, dev) != 0))
 450                 goto out_unregister;
 451
 452         set_ether_mac(dev, device->mac);
 453         dev->mtu = transport->user->max_packet;
 454         dev->open = uml_net_open;
 455         dev->hard_start_xmit = uml_net_start_xmit;
 456         dev->stop = uml_net_close;
 457         dev->get_stats = uml_net_get_stats;
 458         dev->set_multicast_list = uml_net_set_multicast_list;
 459         dev->tx_timeout = uml_net_tx_timeout;
 460         dev->set_mac_address = uml_net_set_mac;
 461         dev->change_mtu = uml_net_change_mtu;
 462         dev->ethtool_ops = &uml_net_ethtool_ops;
 463         dev->watchdog_timeo = (HZ >> 1);
 464         dev->irq = UM_ETH_IRQ;
 465
 466         rtnl_lock();
 467         err = register_netdevice(dev);
 468         rtnl_unlock();
 469         if (err)
 470                 goto out_undo_user_init;
 471
 472         spin_lock(&devices_lock);
 473         list_add(&device->list, &devices);
 474         spin_unlock(&devices_lock);
 475
 476         return;
 477
 478 out_undo_user_init:
 479         if (transport->user->remove != NULL)
 480                 (*transport->user->remove)(&lp->user);
 481 out_unregister:
 482         platform_device_unregister(&device->pdev);
 483         return; /* platform_device_unregister frees dev and device */
 484 out_free_netdev:
 485         free_netdev(dev);
 486 out_free_device:
 487         kfree(device);
 488 }
 489
 490 static struct uml_net *find_device(int n)
 491 {
 492         struct uml_net *device;
 493         struct list_head *ele;
 494
 495         spin_lock(&devices_lock);
 496         list_for_each(ele, &devices){
 497                 device = list_entry(ele, struct uml_net, list);
 498                 if(device->index == n)
 499                         goto out;
 500         }
 501         device = NULL;
 502  out:
 503         spin_unlock(&devices_lock);
 504         return device;
 505 }
 506
 507 static int eth_parse(char *str, int *index_out, char **str_out,
 508                      char **error_out)
 509 {
 510         char *end;
 511         int n, err = -EINVAL;;
 512
 513         n = simple_strtoul(str, &end, 0);
 514         if(end == str){
 515                 *error_out = "Bad device number";
 516                 return err;
 517         }
 518
 519         str = end;
 520         if(*str != '='){
 521                 *error_out = "Expected '=' after device number";
 522                 return err;
 523         }
 524
 525         str++;
 526         if(find_device(n)){
 527                 *error_out = "Device already configured";
 528                 return err;
 529         }
 530
 531         *index_out = n;
 532         *str_out = str;
 533         return 0;
 534 }
 535
 536 struct eth_init {
 537         struct list_head list;
 538         char *init;
 539         int index;
 540 };
 541
 542 static DEFINE_SPINLOCK(transports_lock);
 543 static LIST_HEAD(transports);
 544
 545 /* Filled in during early boot */
 546 static LIST_HEAD(eth_cmd_line);
 547
 548 static int check_transport(struct transport *transport, char *eth, int n,
 549                            void **init_out, char **mac_out)
 550 {
 551         int len;
 552
 553         len = strlen(transport->name);
 554         if(strncmp(eth, transport->name, len))
 555                 return 0;
 556
 557         eth += len;
 558         if(*eth == ',')
 559                 eth++;
 560         else if(*eth != '\0')
 561                 return 0;
 562
 563         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 564         if(*init_out == NULL)
 565                 return 1;
 566
 567         if(!transport->setup(eth, mac_out, *init_out)){
 568                 kfree(*init_out);
 569                 *init_out = NULL;
 570         }
 571         return 1;
 572 }
 573
 574 void register_transport(struct transport *new)
 575 {
 576         struct list_head *ele, *next;
 577         struct eth_init *eth;
 578         void *init;
 579         char *mac = NULL;
 580         int match;
 581
 582         spin_lock(&transports_lock);
 583         BUG_ON(!list_empty(&new->list));
 584         list_add(&new->list, &transports);
 585         spin_unlock(&transports_lock);
 586
 587         list_for_each_safe(ele, next, &eth_cmd_line){
 588                 eth = list_entry(ele, struct eth_init, list);
 589                 match = check_transport(new, eth->init, eth->index, &init,
 590                                         &mac);
 591                 if(!match)
 592                         continue;
 593                 else if(init != NULL){
 594                         eth_configure(eth->index, init, mac, new);
 595                         kfree(init);
 596                 }
 597                 list_del(&eth->list);
 598         }
 599 }
 600
 601 static int eth_setup_common(char *str, int index)
 602 {
 603         struct list_head *ele;
 604         struct transport *transport;
 605         void *init;
 606         char *mac = NULL;
 607         int found = 0;
 608
 609         spin_lock(&transports_lock);
 610         list_for_each(ele, &transports){
 611                 transport = list_entry(ele, struct transport, list);
 612                 if(!check_transport(transport, str, index, &init, &mac))
 613                         continue;
 614                 if(init != NULL){
 615                         eth_configure(index, init, mac, transport);
 616                         kfree(init);
 617                 }
 618                 found = 1;
 619                 break;
 620         }
 621
 622         spin_unlock(&transports_lock);
 623         return found;
 624 }
 625
 626 static int eth_setup(char *str)
 627 {
 628         struct eth_init *new;
 629         char *error;
 630         int n, err;
 631
 632         err = eth_parse(str, &n, &str, &error);
 633         if(err){
 634                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
 635                        str, error);
 636                 return 1;
 637         }
 638
 639         new = alloc_bootmem(sizeof(*new));
 640         if (new == NULL){
 641                 printk("eth_init : alloc_bootmem failed\n");
 642                 return 1;
 643         }
 644
 645         INIT_LIST_HEAD(&new->list);
 646         new->index = n;
 647         new->init = str;
 648
 649         list_add_tail(&new->list, &eth_cmd_line);
 650         return 1;
 651 }
 652
 653 __setup("eth", eth_setup);
 654 __uml_help(eth_setup,
 655 "eth[0-9]+=<transport>,<options>\n"
 656 "    Configure a network device.\n\n"
 657 );
 658
 659 static int net_config(char *str, char **error_out)
 660 {
 661         int n, err;
 662
 663         err = eth_parse(str, &n, &str, error_out);
 664         if(err)
 665                 return err;
 666
 667         /* This string is broken up and the pieces used by the underlying
 668          * driver.  So, it is freed only if eth_setup_common fails.
 669          */
 670         str = kstrdup(str, GFP_KERNEL);
 671         if(str == NULL){
 672                 *error_out = "net_config failed to strdup string";
 673                 return -ENOMEM;
 674         }
 675         err = !eth_setup_common(str, n);
 676         if(err)
 677                 kfree(str);
 678         return(err);
 679 }
 680
 681 static int net_id(char **str, int *start_out, int *end_out)
 682 {
 683         char *end;
 684         int n;
 685
 686         n = simple_strtoul(*str, &end, 0);
 687         if((*end != '\0') || (end == *str))
 688                 return -1;
 689
 690         *start_out = n;
 691         *end_out = n;
 692         *str = end;
 693         return n;
 694 }
 695
 696 static int net_remove(int n, char **error_out)
 697 {
 698         struct uml_net *device;
 699         struct net_device *dev;
 700         struct uml_net_private *lp;
 701
 702         device = find_device(n);
 703         if(device == NULL)
 704                 return -ENODEV;
 705
 706         dev = device->dev;
 707         lp = dev->priv;
 708         if(lp->fd > 0)
 709                 return -EBUSY;
 710         unregister_netdev(dev);
 711         platform_device_unregister(&device->pdev);
 712
 713         return 0;
 714 }
 715
 716 static struct mc_device net_mc = {
 717         .list           = LIST_HEAD_INIT(net_mc.list),
 718         .name           = "eth",
 719         .config         = net_config,
 720         .get_config     = NULL,
 721         .id             = net_id,
 722         .remove         = net_remove,
 723 };
 724
 725 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 726                               void *ptr)
 727 {
 728         struct in_ifaddr *ifa = ptr;
 729         struct net_device *dev = ifa->ifa_dev->dev;
 730         struct uml_net_private *lp;
 731         void (*proc)(unsigned char *, unsigned char *, void *);
 732         unsigned char addr_buf[4], netmask_buf[4];
 733
 734         if(dev->open != uml_net_open)
 735                 return NOTIFY_DONE;
 736
 737         lp = dev->priv;
 738
 739         proc = NULL;
 740         switch (event){
 741         case NETDEV_UP:
 742                 proc = lp->add_address;
 743                 break;
 744         case NETDEV_DOWN:
 745                 proc = lp->delete_address;
 746                 break;
 747         }
 748         if(proc != NULL){
 749                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 750                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 751                 (*proc)(addr_buf, netmask_buf, &lp->user);
 752         }
 753         return NOTIFY_DONE;
 754 }
 755
 756 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
 757 struct notifier_block uml_inetaddr_notifier = {
 758         .notifier_call          = uml_inetaddr_event,
 759 };
 760
 761 static int uml_net_init(void)
 762 {
 763         struct list_head *ele;
 764         struct uml_net_private *lp;
 765         struct in_device *ip;
 766         struct in_ifaddr *in;
 767
 768         mconsole_register_dev(&net_mc);
 769         register_inetaddr_notifier(&uml_inetaddr_notifier);
 770
 771         /* Devices may have been opened already, so the uml_inetaddr_notifier
 772          * didn't get a chance to run for them.  This fakes it so that
 773          * addresses which have already been set up get handled properly.
 774          */
 775         spin_lock(&opened_lock);
 776         list_for_each(ele, &opened){
 777                 lp = list_entry(ele, struct uml_net_private, list);
 778                 ip = lp->dev->ip_ptr;
 779                 if(ip == NULL)
 780                         continue;
 781                 in = ip->ifa_list;
 782                 while(in != NULL){
 783                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 784                         in = in->ifa_next;
 785                 }
 786         }
 787         spin_unlock(&opened_lock);
 788
 789         return 0;
 790 }
 791
 792 __initcall(uml_net_init);
 793
 794 static void close_devices(void)
 795 {
 796         struct list_head *ele;
 797         struct uml_net_private *lp;
 798
 799         spin_lock(&opened_lock);
 800         list_for_each(ele, &opened){
 801                 lp = list_entry(ele, struct uml_net_private, list);
 802                 free_irq(lp->dev->irq, lp->dev);
 803                 if((lp->close != NULL) && (lp->fd >= 0))
 804                         (*lp->close)(lp->fd, &lp->user);
 805                 if(lp->remove != NULL)
 806                         (*lp->remove)(&lp->user);
 807         }
 808         spin_unlock(&opened_lock);
 809 }
 810
 811 __uml_exitcall(close_devices);
 812
 813 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 814 {
 815         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 816                 struct sk_buff *skb2;
 817
 818                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 819                 dev_kfree_skb(skb);
 820                 skb = skb2;
 821         }
 822         if(skb != NULL) skb_put(skb, extra);
 823         return(skb);
 824 }
 825
 826 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 827                                         void *),
 828                     void *arg)
 829 {
 830         struct net_device *dev = d;
 831         struct in_device *ip = dev->ip_ptr;
 832         struct in_ifaddr *in;
 833         unsigned char address[4], netmask[4];
 834
 835         if(ip == NULL) return;
 836         in = ip->ifa_list;
 837         while(in != NULL){
 838                 memcpy(address, &in->ifa_address, sizeof(address));
 839                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 840                 (*cb)(address, netmask, arg);
 841                 in = in->ifa_next;
 842         }
 843 }
 844
 845 int dev_netmask(void *d, void *m)
 846 {
 847         struct net_device *dev = d;
 848         struct in_device *ip = dev->ip_ptr;
 849         struct in_ifaddr *in;
 850         __be32 *mask_out = m;
 851
 852         if(ip == NULL)
 853                 return(1);
 854
 855         in = ip->ifa_list;
 856         if(in == NULL)
 857                 return(1);
 858
 859         *mask_out = in->ifa_mask;
 860         return(0);
 861 }
 862
 863 void *get_output_buffer(int *len_out)
 864 {
 865         void *ret;
 866
 867         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 868         if(ret) *len_out = PAGE_SIZE;
 869         else *len_out = 0;
 870         return ret;
 871 }
 872
 873 void free_output_buffer(void *buffer)
 874 {
 875         free_pages((unsigned long) buffer, 0);
 876 }
 877
 878 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 879                      char **gate_addr)
 880 {
 881         char *remain;
 882
 883         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 884         if(remain != NULL){
 885                 printk("tap_setup_common - Extra garbage on specification : "
 886                        "'%s'\n", remain);
 887                 return(1);
 888         }
 889
 890         return(0);
 891 }
 892
 893 unsigned short eth_protocol(struct sk_buff *skb)
 894 {
 895         return(eth_type_trans(skb, skb->dev));
 896 }