SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/config.h"
   9 #include "linux/kernel.h"
  10 #include "linux/netdevice.h"
  11 #include "linux/rtnetlink.h"
  12 #include "linux/skbuff.h"
  13 #include "linux/socket.h"
  14 #include "linux/spinlock.h"
  15 #include "linux/module.h"
  16 #include "linux/init.h"
  17 #include "linux/etherdevice.h"
  18 #include "linux/list.h"
  19 #include "linux/inetdevice.h"
  20 #include "linux/ctype.h"
  21 #include "linux/bootmem.h"
  22 #include "linux/ethtool.h"
  23 #include "linux/platform_device.h"
  24 #include "asm/uaccess.h"
  25 #include "user_util.h"
  26 #include "kern_util.h"
  27 #include "net_kern.h"
  28 #include "net_user.h"
  29 #include "mconsole_kern.h"
  30 #include "init.h"
  31 #include "irq_user.h"
  32 #include "irq_kern.h"
  33
  34 #define DRIVER_NAME "uml-netdev"
  35
  36 static DEFINE_SPINLOCK(opened_lock);
  37 LIST_HEAD(opened);
  38
  39 static int uml_net_rx(struct net_device *dev)
  40 {
  41         struct uml_net_private *lp = dev->priv;
  42         int pkt_len;
  43         struct sk_buff *skb;
  44
  45         /* If we can't allocate memory, try again next round. */
  46         skb = dev_alloc_skb(dev->mtu);
  47         if (skb == NULL) {
  48                 lp->stats.rx_dropped++;
  49                 return 0;
  50         }
  51
  52         skb->dev = dev;
  53         skb_put(skb, dev->mtu);
  54         skb->mac.raw = skb->data;
  55         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  56
  57         if (pkt_len > 0) {
  58                 skb_trim(skb, pkt_len);
  59                 skb->protocol = (*lp->protocol)(skb);
  60                 netif_rx(skb);
  61
  62                 lp->stats.rx_bytes += skb->len;
  63                 lp->stats.rx_packets++;
  64                 return pkt_len;
  65         }
  66
  67         kfree_skb(skb);
  68         return pkt_len;
  69 }
  70
  71 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  72 {
  73         struct net_device *dev = dev_id;
  74         struct uml_net_private *lp = dev->priv;
  75         int err;
  76
  77         if(!netif_running(dev))
  78                 return(IRQ_NONE);
  79
  80         spin_lock(&lp->lock);
  81         while((err = uml_net_rx(dev)) > 0) ;
  82         if(err < 0) {
  83                 printk(KERN_ERR
  84                        "Device '%s' read returned %d, shutting it down\n",
  85                        dev->name, err);
  86                 dev_close(dev);
  87                 goto out;
  88         }
  89         reactivate_fd(lp->fd, UM_ETH_IRQ);
  90
  91  out:
  92         spin_unlock(&lp->lock);
  93         return(IRQ_HANDLED);
  94 }
  95
  96 static int uml_net_open(struct net_device *dev)
  97 {
  98         struct uml_net_private *lp = dev->priv;
  99         int err;
 100
 101         spin_lock(&lp->lock);
 102
 103         if(lp->fd >= 0){
 104                 err = -ENXIO;
 105                 goto out;
 106         }
 107
 108         if(!lp->have_mac){
 109                 dev_ip_addr(dev, &lp->mac[2]);
 110                 set_ether_mac(dev, lp->mac);
 111         }
 112
 113         lp->fd = (*lp->open)(&lp->user);
 114         if(lp->fd < 0){
 115                 err = lp->fd;
 116                 goto out;
 117         }
 118
 119         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 120                              SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
 121         if(err != 0){
 122                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 123                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 124                 lp->fd = -1;
 125                 err = -ENETUNREACH;
 126         }
 127
 128         lp->tl.data = (unsigned long) &lp->user;
 129         netif_start_queue(dev);
 130
 131         /* clear buffer - it can happen that the host side of the interface
 132          * is full when we get here.  In this case, new data is never queued,
 133          * SIGIOs never arrive, and the net never works.
 134          */
 135         while((err = uml_net_rx(dev)) > 0) ;
 136
 137  out:
 138         spin_unlock(&lp->lock);
 139         return(err);
 140 }
 141
 142 static int uml_net_close(struct net_device *dev)
 143 {
 144         struct uml_net_private *lp = dev->priv;
 145
 146         netif_stop_queue(dev);
 147         spin_lock(&lp->lock);
 148
 149         free_irq(dev->irq, dev);
 150         if(lp->close != NULL)
 151                 (*lp->close)(lp->fd, &lp->user);
 152         lp->fd = -1;
 153
 154         spin_unlock(&lp->lock);
 155         return 0;
 156 }
 157
 158 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 159 {
 160         struct uml_net_private *lp = dev->priv;
 161         unsigned long flags;
 162         int len;
 163
 164         netif_stop_queue(dev);
 165
 166         spin_lock_irqsave(&lp->lock, flags);
 167
 168         len = (*lp->write)(lp->fd, &skb, lp);
 169
 170         if(len == skb->len) {
 171                 lp->stats.tx_packets++;
 172                 lp->stats.tx_bytes += skb->len;
 173                 dev->trans_start = jiffies;
 174                 netif_start_queue(dev);
 175
 176                 /* this is normally done in the interrupt when tx finishes */
 177                 netif_wake_queue(dev);
 178         }
 179         else if(len == 0){
 180                 netif_start_queue(dev);
 181                 lp->stats.tx_dropped++;
 182         }
 183         else {
 184                 netif_start_queue(dev);
 185                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 186         }
 187
 188         spin_unlock_irqrestore(&lp->lock, flags);
 189
 190         dev_kfree_skb(skb);
 191
 192         return 0;
 193 }
 194
 195 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 196 {
 197         struct uml_net_private *lp = dev->priv;
 198         return &lp->stats;
 199 }
 200
 201 static void uml_net_set_multicast_list(struct net_device *dev)
 202 {
 203         if (dev->flags & IFF_PROMISC) return;
 204         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 205         else dev->flags &= ~IFF_ALLMULTI;
 206 }
 207
 208 static void uml_net_tx_timeout(struct net_device *dev)
 209 {
 210         dev->trans_start = jiffies;
 211         netif_wake_queue(dev);
 212 }
 213
 214 static int uml_net_set_mac(struct net_device *dev, void *addr)
 215 {
 216         struct uml_net_private *lp = dev->priv;
 217         struct sockaddr *hwaddr = addr;
 218
 219         spin_lock(&lp->lock);
 220         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
 221         spin_unlock(&lp->lock);
 222
 223         return(0);
 224 }
 225
 226 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 227 {
 228         struct uml_net_private *lp = dev->priv;
 229         int err = 0;
 230
 231         spin_lock(&lp->lock);
 232
 233         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 234         if(new_mtu < 0){
 235                 err = new_mtu;
 236                 goto out;
 237         }
 238
 239         dev->mtu = new_mtu;
 240
 241  out:
 242         spin_unlock(&lp->lock);
 243         return err;
 244 }
 245
 246 static void uml_net_get_drvinfo(struct net_device *dev,
 247                                 struct ethtool_drvinfo *info)
 248 {
 249         strcpy(info->driver, DRIVER_NAME);
 250         strcpy(info->version, "42");
 251 }
 252
 253 static struct ethtool_ops uml_net_ethtool_ops = {
 254         .get_drvinfo    = uml_net_get_drvinfo,
 255         .get_link       = ethtool_op_get_link,
 256 };
 257
 258 void uml_net_user_timer_expire(unsigned long _conn)
 259 {
 260 #ifdef undef
 261         struct connection *conn = (struct connection *)_conn;
 262
 263         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 264         do_connect(conn);
 265 #endif
 266 }
 267
 268 static DEFINE_SPINLOCK(devices_lock);
 269 static struct list_head devices = LIST_HEAD_INIT(devices);
 270
 271 static struct device_driver uml_net_driver = {
 272         .name  = DRIVER_NAME,
 273         .bus   = &platform_bus_type,
 274 };
 275 static int driver_registered;
 276
 277 static int eth_configure(int n, void *init, char *mac,
 278                          struct transport *transport)
 279 {
 280         struct uml_net *device;
 281         struct net_device *dev;
 282         struct uml_net_private *lp;
 283         int save, err, size;
 284
 285         size = transport->private_size + sizeof(struct uml_net_private) +
 286                 sizeof(((struct uml_net_private *) 0)->user);
 287
 288         device = kmalloc(sizeof(*device), GFP_KERNEL);
 289         if (device == NULL) {
 290                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 291                 return(1);
 292         }
 293
 294         memset(device, 0, sizeof(*device));
 295         INIT_LIST_HEAD(&device->list);
 296         device->index = n;
 297
 298         spin_lock(&devices_lock);
 299         list_add(&device->list, &devices);
 300         spin_unlock(&devices_lock);
 301
 302         if (setup_etheraddr(mac, device->mac))
 303                 device->have_mac = 1;
 304
 305         printk(KERN_INFO "Netdevice %d ", n);
 306         if (device->have_mac)
 307                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 308                        device->mac[0], device->mac[1],
 309                        device->mac[2], device->mac[3],
 310                        device->mac[4], device->mac[5]);
 311         printk(": ");
 312         dev = alloc_etherdev(size);
 313         if (dev == NULL) {
 314                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 315                 return 1;
 316         }
 317
 318         /* sysfs register */
 319         if (!driver_registered) {
 320                 driver_register(&uml_net_driver);
 321                 driver_registered = 1;
 322         }
 323         device->pdev.id = n;
 324         device->pdev.name = DRIVER_NAME;
 325         platform_device_register(&device->pdev);
 326         SET_NETDEV_DEV(dev,&device->pdev.dev);
 327
 328         /* If this name ends up conflicting with an existing registered
 329          * netdevice, that is OK, register_netdev{,ice}() will notice this
 330          * and fail.
 331          */
 332         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 333         device->dev = dev;
 334
 335         (*transport->kern->init)(dev, init);
 336
 337         dev->mtu = transport->user->max_packet;
 338         dev->open = uml_net_open;
 339         dev->hard_start_xmit = uml_net_start_xmit;
 340         dev->stop = uml_net_close;
 341         dev->get_stats = uml_net_get_stats;
 342         dev->set_multicast_list = uml_net_set_multicast_list;
 343         dev->tx_timeout = uml_net_tx_timeout;
 344         dev->set_mac_address = uml_net_set_mac;
 345         dev->change_mtu = uml_net_change_mtu;
 346         dev->ethtool_ops = &uml_net_ethtool_ops;
 347         dev->watchdog_timeo = (HZ >> 1);
 348         dev->irq = UM_ETH_IRQ;
 349
 350         rtnl_lock();
 351         err = register_netdevice(dev);
 352         rtnl_unlock();
 353         if (err) {
 354                 device->dev = NULL;
 355                 /* XXX: should we call ->remove() here? */
 356                 free_netdev(dev);
 357                 return 1;
 358         }
 359         lp = dev->priv;
 360
 361         /* lp.user is the first four bytes of the transport data, which
 362          * has already been initialized.  This structure assignment will
 363          * overwrite that, so we make sure that .user gets overwritten with
 364          * what it already has.
 365          */
 366         save = lp->user[0];
 367         *lp = ((struct uml_net_private)
 368                 { .list                 = LIST_HEAD_INIT(lp->list),
 369                   .dev                  = dev,
 370                   .fd                   = -1,
 371                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 372                   .have_mac             = device->have_mac,
 373                   .protocol             = transport->kern->protocol,
 374                   .open                 = transport->user->open,
 375                   .close                = transport->user->close,
 376                   .remove               = transport->user->remove,
 377                   .read                 = transport->kern->read,
 378                   .write                = transport->kern->write,
 379                   .add_address          = transport->user->add_address,
 380                   .delete_address       = transport->user->delete_address,
 381                   .set_mtu              = transport->user->set_mtu,
 382                   .user                 = { save } });
 383
 384         init_timer(&lp->tl);
 385         spin_lock_init(&lp->lock);
 386         lp->tl.function = uml_net_user_timer_expire;
 387         if (lp->have_mac)
 388                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 389
 390         if (transport->user->init)
 391                 (*transport->user->init)(&lp->user, dev);
 392
 393         if (device->have_mac)
 394                 set_ether_mac(dev, device->mac);
 395
 396         spin_lock(&opened_lock);
 397         list_add(&lp->list, &opened);
 398         spin_unlock(&opened_lock);
 399
 400         return(0);
 401 }
 402
 403 static struct uml_net *find_device(int n)
 404 {
 405         struct uml_net *device;
 406         struct list_head *ele;
 407
 408         spin_lock(&devices_lock);
 409         list_for_each(ele, &devices){
 410                 device = list_entry(ele, struct uml_net, list);
 411                 if(device->index == n)
 412                         goto out;
 413         }
 414         device = NULL;
 415  out:
 416         spin_unlock(&devices_lock);
 417         return(device);
 418 }
 419
 420 static int eth_parse(char *str, int *index_out, char **str_out)
 421 {
 422         char *end;
 423         int n;
 424
 425         n = simple_strtoul(str, &end, 0);
 426         if(end == str){
 427                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 428                 return(1);
 429         }
 430         if(n < 0){
 431                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 432                 return(1);
 433         }
 434         str = end;
 435         if(*str != '='){
 436                 printk(KERN_ERR
 437                        "eth_setup: expected '=' after device number\n");
 438                 return(1);
 439         }
 440         str++;
 441         if(find_device(n)){
 442                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 443                        n);
 444                 return(1);
 445         }
 446         if(index_out) *index_out = n;
 447         *str_out = str;
 448         return(0);
 449 }
 450
 451 struct eth_init {
 452         struct list_head list;
 453         char *init;
 454         int index;
 455 };
 456
 457 /* Filled in at boot time.  Will need locking if the transports become
 458  * modular.
 459  */
 460 struct list_head transports = LIST_HEAD_INIT(transports);
 461
 462 /* Filled in during early boot */
 463 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 464
 465 static int check_transport(struct transport *transport, char *eth, int n,
 466                            void **init_out, char **mac_out)
 467 {
 468         int len;
 469
 470         len = strlen(transport->name);
 471         if(strncmp(eth, transport->name, len))
 472                 return(0);
 473
 474         eth += len;
 475         if(*eth == ',')
 476                 eth++;
 477         else if(*eth != '\0')
 478                 return(0);
 479
 480         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 481         if(*init_out == NULL)
 482                 return(1);
 483
 484         if(!transport->setup(eth, mac_out, *init_out)){
 485                 kfree(*init_out);
 486                 *init_out = NULL;
 487         }
 488         return(1);
 489 }
 490
 491 void register_transport(struct transport *new)
 492 {
 493         struct list_head *ele, *next;
 494         struct eth_init *eth;
 495         void *init;
 496         char *mac = NULL;
 497         int match;
 498
 499         list_add(&new->list, &transports);
 500
 501         list_for_each_safe(ele, next, &eth_cmd_line){
 502                 eth = list_entry(ele, struct eth_init, list);
 503                 match = check_transport(new, eth->init, eth->index, &init,
 504                                         &mac);
 505                 if(!match)
 506                         continue;
 507                 else if(init != NULL){
 508                         eth_configure(eth->index, init, mac, new);
 509                         kfree(init);
 510                 }
 511                 list_del(&eth->list);
 512         }
 513 }
 514
 515 static int eth_setup_common(char *str, int index)
 516 {
 517         struct list_head *ele;
 518         struct transport *transport;
 519         void *init;
 520         char *mac = NULL;
 521
 522         list_for_each(ele, &transports){
 523                 transport = list_entry(ele, struct transport, list);
 524                 if(!check_transport(transport, str, index, &init, &mac))
 525                         continue;
 526                 if(init != NULL){
 527                         eth_configure(index, init, mac, transport);
 528                         kfree(init);
 529                 }
 530                 return(1);
 531         }
 532         return(0);
 533 }
 534
 535 static int eth_setup(char *str)
 536 {
 537         struct eth_init *new;
 538         int n, err;
 539
 540         err = eth_parse(str, &n, &str);
 541         if(err) return(1);
 542
 543         new = alloc_bootmem(sizeof(new));
 544         if (new == NULL){
 545                 printk("eth_init : alloc_bootmem failed\n");
 546                 return(1);
 547         }
 548
 549         INIT_LIST_HEAD(&new->list);
 550         new->index = n;
 551         new->init = str;
 552
 553         list_add_tail(&new->list, &eth_cmd_line);
 554         return(1);
 555 }
 556
 557 __setup("eth", eth_setup);
 558 __uml_help(eth_setup,
 559 "eth[0-9]+=<transport>,<options>\n"
 560 "    Configure a network device.\n\n"
 561 );
 562
 563 #if 0
 564 static int eth_init(void)
 565 {
 566         struct list_head *ele, *next;
 567         struct eth_init *eth;
 568
 569         list_for_each_safe(ele, next, &eth_cmd_line){
 570                 eth = list_entry(ele, struct eth_init, list);
 571
 572                 if(eth_setup_common(eth->init, eth->index))
 573                         list_del(&eth->list);
 574         }
 575
 576         return(1);
 577 }
 578 __initcall(eth_init);
 579 #endif
 580
 581 static int net_config(char *str)
 582 {
 583         int n, err;
 584
 585         err = eth_parse(str, &n, &str);
 586         if(err) return(err);
 587
 588         str = uml_strdup(str);
 589         if(str == NULL){
 590                 printk(KERN_ERR "net_config failed to strdup string\n");
 591                 return(-1);
 592         }
 593         err = !eth_setup_common(str, n);
 594         if(err)
 595                 kfree(str);
 596         return(err);
 597 }
 598
 599 static int net_id(char **str, int *start_out, int *end_out)
 600 {
 601         char *end;
 602         int n;
 603
 604         n = simple_strtoul(*str, &end, 0);
 605         if((*end != '\0') || (end == *str))
 606                 return -1;
 607
 608         *start_out = n;
 609         *end_out = n;
 610         *str = end;
 611         return n;
 612 }
 613
 614 static int net_remove(int n)
 615 {
 616         struct uml_net *device;
 617         struct net_device *dev;
 618         struct uml_net_private *lp;
 619
 620         device = find_device(n);
 621         if(device == NULL)
 622                 return -ENODEV;
 623
 624         dev = device->dev;
 625         lp = dev->priv;
 626         if(lp->fd > 0)
 627                 return -EBUSY;
 628         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 629         unregister_netdev(dev);
 630         platform_device_unregister(&device->pdev);
 631
 632         list_del(&device->list);
 633         kfree(device);
 634         free_netdev(dev);
 635         return 0;
 636 }
 637
 638 static struct mc_device net_mc = {
 639         .name           = "eth",
 640         .config         = net_config,
 641         .get_config     = NULL,
 642         .id             = net_id,
 643         .remove         = net_remove,
 644 };
 645
 646 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 647                               void *ptr)
 648 {
 649         struct in_ifaddr *ifa = ptr;
 650         struct net_device *dev = ifa->ifa_dev->dev;
 651         struct uml_net_private *lp;
 652         void (*proc)(unsigned char *, unsigned char *, void *);
 653         unsigned char addr_buf[4], netmask_buf[4];
 654
 655         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 656
 657         lp = dev->priv;
 658
 659         proc = NULL;
 660         switch (event){
 661         case NETDEV_UP:
 662                 proc = lp->add_address;
 663                 break;
 664         case NETDEV_DOWN:
 665                 proc = lp->delete_address;
 666                 break;
 667         }
 668         if(proc != NULL){
 669                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 670                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 671                 (*proc)(addr_buf, netmask_buf, &lp->user);
 672         }
 673         return(NOTIFY_DONE);
 674 }
 675
 676 struct notifier_block uml_inetaddr_notifier = {
 677         .notifier_call          = uml_inetaddr_event,
 678 };
 679
 680 static int uml_net_init(void)
 681 {
 682         struct list_head *ele;
 683         struct uml_net_private *lp;
 684         struct in_device *ip;
 685         struct in_ifaddr *in;
 686
 687         mconsole_register_dev(&net_mc);
 688         register_inetaddr_notifier(&uml_inetaddr_notifier);
 689
 690         /* Devices may have been opened already, so the uml_inetaddr_notifier
 691          * didn't get a chance to run for them.  This fakes it so that
 692          * addresses which have already been set up get handled properly.
 693          */
 694         list_for_each(ele, &opened){
 695                 lp = list_entry(ele, struct uml_net_private, list);
 696                 ip = lp->dev->ip_ptr;
 697                 if(ip == NULL) continue;
 698                 in = ip->ifa_list;
 699                 while(in != NULL){
 700                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 701                         in = in->ifa_next;
 702                 }
 703         }
 704
 705         return(0);
 706 }
 707
 708 __initcall(uml_net_init);
 709
 710 static void close_devices(void)
 711 {
 712         struct list_head *ele;
 713         struct uml_net_private *lp;
 714
 715         list_for_each(ele, &opened){
 716                 lp = list_entry(ele, struct uml_net_private, list);
 717                 if((lp->close != NULL) && (lp->fd >= 0))
 718                         (*lp->close)(lp->fd, &lp->user);
 719                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 720         }
 721 }
 722
 723 __uml_exitcall(close_devices);
 724
 725 int setup_etheraddr(char *str, unsigned char *addr)
 726 {
 727         char *end;
 728         int i;
 729
 730         if(str == NULL)
 731                 return(0);
 732         for(i=0;i<6;i++){
 733                 addr[i] = simple_strtoul(str, &end, 16);
 734                 if((end == str) ||
 735                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 736                         printk(KERN_ERR
 737                                "setup_etheraddr: failed to parse '%s' "
 738                                "as an ethernet address\n", str);
 739                         return(0);
 740                 }
 741                 str = end + 1;
 742         }
 743         if(addr[0] & 1){
 744                 printk(KERN_ERR
 745                        "Attempt to assign a broadcast ethernet address to a "
 746                        "device disallowed\n");
 747                 return(0);
 748         }
 749         return(1);
 750 }
 751
 752 void dev_ip_addr(void *d, unsigned char *bin_buf)
 753 {
 754         struct net_device *dev = d;
 755         struct in_device *ip = dev->ip_ptr;
 756         struct in_ifaddr *in;
 757
 758         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 759                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 760                        "IP address\n");
 761                 return;
 762         }
 763         memcpy(bin_buf, &in->ifa_address, sizeof(in->ifa_address));
 764 }
 765
 766 void set_ether_mac(void *d, unsigned char *addr)
 767 {
 768         struct net_device *dev = d;
 769
 770         memcpy(dev->dev_addr, addr, ETH_ALEN);
 771 }
 772
 773 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 774 {
 775         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 776                 struct sk_buff *skb2;
 777
 778                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 779                 dev_kfree_skb(skb);
 780                 skb = skb2;
 781         }
 782         if(skb != NULL) skb_put(skb, extra);
 783         return(skb);
 784 }
 785
 786 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 787                                         void *),
 788                     void *arg)
 789 {
 790         struct net_device *dev = d;
 791         struct in_device *ip = dev->ip_ptr;
 792         struct in_ifaddr *in;
 793         unsigned char address[4], netmask[4];
 794
 795         if(ip == NULL) return;
 796         in = ip->ifa_list;
 797         while(in != NULL){
 798                 memcpy(address, &in->ifa_address, sizeof(address));
 799                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 800                 (*cb)(address, netmask, arg);
 801                 in = in->ifa_next;
 802         }
 803 }
 804
 805 int dev_netmask(void *d, void *m)
 806 {
 807         struct net_device *dev = d;
 808         struct in_device *ip = dev->ip_ptr;
 809         struct in_ifaddr *in;
 810         __u32 *mask_out = m;
 811
 812         if(ip == NULL)
 813                 return(1);
 814
 815         in = ip->ifa_list;
 816         if(in == NULL)
 817                 return(1);
 818
 819         *mask_out = in->ifa_mask;
 820         return(0);
 821 }
 822
 823 void *get_output_buffer(int *len_out)
 824 {
 825         void *ret;
 826
 827         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 828         if(ret) *len_out = PAGE_SIZE;
 829         else *len_out = 0;
 830         return(ret);
 831 }
 832
 833 void free_output_buffer(void *buffer)
 834 {
 835         free_pages((unsigned long) buffer, 0);
 836 }
 837
 838 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 839                      char **gate_addr)
 840 {
 841         char *remain;
 842
 843         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 844         if(remain != NULL){
 845                 printk("tap_setup_common - Extra garbage on specification : "
 846                        "'%s'\n", remain);
 847                 return(1);
 848         }
 849
 850         return(0);
 851 }
 852
 853 unsigned short eth_protocol(struct sk_buff *skb)
 854 {
 855         return(eth_type_trans(skb, skb->dev));
 856 }
 857
 858 /*
 859  * Overrides for Emacs so that we follow Linus's tabbing style.
 860  * Emacs will notice this stuff at the end of the file and automatically
 861  * adjust the settings for this buffer only.  This must remain at the end
 862  * of the file.
 863  * ---------------------------------------------------------------------------
 864  * Local variables:
 865  * c-file-style: "linux"
 866  * End:
 867  */