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 platform_driver uml_net_driver = {
 272         .driver = {
 273                 .name  = DRIVER_NAME,
 274         },
 275 };
 276 static int driver_registered;
 277
 278 static int eth_configure(int n, void *init, char *mac,
 279                          struct transport *transport)
 280 {
 281         struct uml_net *device;
 282         struct net_device *dev;
 283         struct uml_net_private *lp;
 284         int save, err, size;
 285
 286         size = transport->private_size + sizeof(struct uml_net_private) +
 287                 sizeof(((struct uml_net_private *) 0)->user);
 288
 289         device = kmalloc(sizeof(*device), GFP_KERNEL);
 290         if (device == NULL) {
 291                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 292                 return(1);
 293         }
 294
 295         memset(device, 0, sizeof(*device));
 296         INIT_LIST_HEAD(&device->list);
 297         device->index = n;
 298
 299         spin_lock(&devices_lock);
 300         list_add(&device->list, &devices);
 301         spin_unlock(&devices_lock);
 302
 303         if (setup_etheraddr(mac, device->mac))
 304                 device->have_mac = 1;
 305
 306         printk(KERN_INFO "Netdevice %d ", n);
 307         if (device->have_mac)
 308                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 309                        device->mac[0], device->mac[1],
 310                        device->mac[2], device->mac[3],
 311                        device->mac[4], device->mac[5]);
 312         printk(": ");
 313         dev = alloc_etherdev(size);
 314         if (dev == NULL) {
 315                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 316                 return 1;
 317         }
 318
 319         /* sysfs register */
 320         if (!driver_registered) {
 321                 platform_driver_register(&uml_net_driver);
 322                 driver_registered = 1;
 323         }
 324         device->pdev.id = n;
 325         device->pdev.name = DRIVER_NAME;
 326         platform_device_register(&device->pdev);
 327         SET_NETDEV_DEV(dev,&device->pdev.dev);
 328
 329         /* If this name ends up conflicting with an existing registered
 330          * netdevice, that is OK, register_netdev{,ice}() will notice this
 331          * and fail.
 332          */
 333         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 334         device->dev = dev;
 335
 336         (*transport->kern->init)(dev, init);
 337
 338         dev->mtu = transport->user->max_packet;
 339         dev->open = uml_net_open;
 340         dev->hard_start_xmit = uml_net_start_xmit;
 341         dev->stop = uml_net_close;
 342         dev->get_stats = uml_net_get_stats;
 343         dev->set_multicast_list = uml_net_set_multicast_list;
 344         dev->tx_timeout = uml_net_tx_timeout;
 345         dev->set_mac_address = uml_net_set_mac;
 346         dev->change_mtu = uml_net_change_mtu;
 347         dev->ethtool_ops = &uml_net_ethtool_ops;
 348         dev->watchdog_timeo = (HZ >> 1);
 349         dev->irq = UM_ETH_IRQ;
 350
 351         rtnl_lock();
 352         err = register_netdevice(dev);
 353         rtnl_unlock();
 354         if (err) {
 355                 device->dev = NULL;
 356                 /* XXX: should we call ->remove() here? */
 357                 free_netdev(dev);
 358                 return 1;
 359         }
 360         lp = dev->priv;
 361
 362         /* lp.user is the first four bytes of the transport data, which
 363          * has already been initialized.  This structure assignment will
 364          * overwrite that, so we make sure that .user gets overwritten with
 365          * what it already has.
 366          */
 367         save = lp->user[0];
 368         *lp = ((struct uml_net_private)
 369                 { .list                 = LIST_HEAD_INIT(lp->list),
 370                   .dev                  = dev,
 371                   .fd                   = -1,
 372                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 373                   .have_mac             = device->have_mac,
 374                   .protocol             = transport->kern->protocol,
 375                   .open                 = transport->user->open,
 376                   .close                = transport->user->close,
 377                   .remove               = transport->user->remove,
 378                   .read                 = transport->kern->read,
 379                   .write                = transport->kern->write,
 380                   .add_address          = transport->user->add_address,
 381                   .delete_address       = transport->user->delete_address,
 382                   .set_mtu              = transport->user->set_mtu,
 383                   .user                 = { save } });
 384
 385         init_timer(&lp->tl);
 386         spin_lock_init(&lp->lock);
 387         lp->tl.function = uml_net_user_timer_expire;
 388         if (lp->have_mac)
 389                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 390
 391         if (transport->user->init)
 392                 (*transport->user->init)(&lp->user, dev);
 393
 394         if (device->have_mac)
 395                 set_ether_mac(dev, device->mac);
 396
 397         spin_lock(&opened_lock);
 398         list_add(&lp->list, &opened);
 399         spin_unlock(&opened_lock);
 400
 401         return(0);
 402 }
 403
 404 static struct uml_net *find_device(int n)
 405 {
 406         struct uml_net *device;
 407         struct list_head *ele;
 408
 409         spin_lock(&devices_lock);
 410         list_for_each(ele, &devices){
 411                 device = list_entry(ele, struct uml_net, list);
 412                 if(device->index == n)
 413                         goto out;
 414         }
 415         device = NULL;
 416  out:
 417         spin_unlock(&devices_lock);
 418         return(device);
 419 }
 420
 421 static int eth_parse(char *str, int *index_out, char **str_out)
 422 {
 423         char *end;
 424         int n;
 425
 426         n = simple_strtoul(str, &end, 0);
 427         if(end == str){
 428                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 429                 return(1);
 430         }
 431         if(n < 0){
 432                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 433                 return(1);
 434         }
 435         str = end;
 436         if(*str != '='){
 437                 printk(KERN_ERR
 438                        "eth_setup: expected '=' after device number\n");
 439                 return(1);
 440         }
 441         str++;
 442         if(find_device(n)){
 443                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 444                        n);
 445                 return(1);
 446         }
 447         if(index_out) *index_out = n;
 448         *str_out = str;
 449         return(0);
 450 }
 451
 452 struct eth_init {
 453         struct list_head list;
 454         char *init;
 455         int index;
 456 };
 457
 458 /* Filled in at boot time.  Will need locking if the transports become
 459  * modular.
 460  */
 461 struct list_head transports = LIST_HEAD_INIT(transports);
 462
 463 /* Filled in during early boot */
 464 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 465
 466 static int check_transport(struct transport *transport, char *eth, int n,
 467                            void **init_out, char **mac_out)
 468 {
 469         int len;
 470
 471         len = strlen(transport->name);
 472         if(strncmp(eth, transport->name, len))
 473                 return(0);
 474
 475         eth += len;
 476         if(*eth == ',')
 477                 eth++;
 478         else if(*eth != '\0')
 479                 return(0);
 480
 481         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 482         if(*init_out == NULL)
 483                 return(1);
 484
 485         if(!transport->setup(eth, mac_out, *init_out)){
 486                 kfree(*init_out);
 487                 *init_out = NULL;
 488         }
 489         return(1);
 490 }
 491
 492 void register_transport(struct transport *new)
 493 {
 494         struct list_head *ele, *next;
 495         struct eth_init *eth;
 496         void *init;
 497         char *mac = NULL;
 498         int match;
 499
 500         list_add(&new->list, &transports);
 501
 502         list_for_each_safe(ele, next, &eth_cmd_line){
 503                 eth = list_entry(ele, struct eth_init, list);
 504                 match = check_transport(new, eth->init, eth->index, &init,
 505                                         &mac);
 506                 if(!match)
 507                         continue;
 508                 else if(init != NULL){
 509                         eth_configure(eth->index, init, mac, new);
 510                         kfree(init);
 511                 }
 512                 list_del(&eth->list);
 513         }
 514 }
 515
 516 static int eth_setup_common(char *str, int index)
 517 {
 518         struct list_head *ele;
 519         struct transport *transport;
 520         void *init;
 521         char *mac = NULL;
 522
 523         list_for_each(ele, &transports){
 524                 transport = list_entry(ele, struct transport, list);
 525                 if(!check_transport(transport, str, index, &init, &mac))
 526                         continue;
 527                 if(init != NULL){
 528                         eth_configure(index, init, mac, transport);
 529                         kfree(init);
 530                 }
 531                 return(1);
 532         }
 533         return(0);
 534 }
 535
 536 static int eth_setup(char *str)
 537 {
 538         struct eth_init *new;
 539         int n, err;
 540
 541         err = eth_parse(str, &n, &str);
 542         if(err) return(1);
 543
 544         new = alloc_bootmem(sizeof(new));
 545         if (new == NULL){
 546                 printk("eth_init : alloc_bootmem failed\n");
 547                 return(1);
 548         }
 549
 550         INIT_LIST_HEAD(&new->list);
 551         new->index = n;
 552         new->init = str;
 553
 554         list_add_tail(&new->list, &eth_cmd_line);
 555         return(1);
 556 }
 557
 558 __setup("eth", eth_setup);
 559 __uml_help(eth_setup,
 560 "eth[0-9]+=<transport>,<options>\n"
 561 "    Configure a network device.\n\n"
 562 );
 563
 564 #if 0
 565 static int eth_init(void)
 566 {
 567         struct list_head *ele, *next;
 568         struct eth_init *eth;
 569
 570         list_for_each_safe(ele, next, &eth_cmd_line){
 571                 eth = list_entry(ele, struct eth_init, list);
 572
 573                 if(eth_setup_common(eth->init, eth->index))
 574                         list_del(&eth->list);
 575         }
 576
 577         return(1);
 578 }
 579 __initcall(eth_init);
 580 #endif
 581
 582 static int net_config(char *str)
 583 {
 584         int n, err;
 585
 586         err = eth_parse(str, &n, &str);
 587         if(err) return(err);
 588
 589         str = uml_strdup(str);
 590         if(str == NULL){
 591                 printk(KERN_ERR "net_config failed to strdup string\n");
 592                 return(-1);
 593         }
 594         err = !eth_setup_common(str, n);
 595         if(err)
 596                 kfree(str);
 597         return(err);
 598 }
 599
 600 static int net_id(char **str, int *start_out, int *end_out)
 601 {
 602         char *end;
 603         int n;
 604
 605         n = simple_strtoul(*str, &end, 0);
 606         if((*end != '\0') || (end == *str))
 607                 return -1;
 608
 609         *start_out = n;
 610         *end_out = n;
 611         *str = end;
 612         return n;
 613 }
 614
 615 static int net_remove(int n)
 616 {
 617         struct uml_net *device;
 618         struct net_device *dev;
 619         struct uml_net_private *lp;
 620
 621         device = find_device(n);
 622         if(device == NULL)
 623                 return -ENODEV;
 624
 625         dev = device->dev;
 626         lp = dev->priv;
 627         if(lp->fd > 0)
 628                 return -EBUSY;
 629         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 630         unregister_netdev(dev);
 631         platform_device_unregister(&device->pdev);
 632
 633         list_del(&device->list);
 634         kfree(device);
 635         free_netdev(dev);
 636         return 0;
 637 }
 638
 639 static struct mc_device net_mc = {
 640         .name           = "eth",
 641         .config         = net_config,
 642         .get_config     = NULL,
 643         .id             = net_id,
 644         .remove         = net_remove,
 645 };
 646
 647 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 648                               void *ptr)
 649 {
 650         struct in_ifaddr *ifa = ptr;
 651         struct net_device *dev = ifa->ifa_dev->dev;
 652         struct uml_net_private *lp;
 653         void (*proc)(unsigned char *, unsigned char *, void *);
 654         unsigned char addr_buf[4], netmask_buf[4];
 655
 656         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 657
 658         lp = dev->priv;
 659
 660         proc = NULL;
 661         switch (event){
 662         case NETDEV_UP:
 663                 proc = lp->add_address;
 664                 break;
 665         case NETDEV_DOWN:
 666                 proc = lp->delete_address;
 667                 break;
 668         }
 669         if(proc != NULL){
 670                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
 671                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
 672                 (*proc)(addr_buf, netmask_buf, &lp->user);
 673         }
 674         return(NOTIFY_DONE);
 675 }
 676
 677 struct notifier_block uml_inetaddr_notifier = {
 678         .notifier_call          = uml_inetaddr_event,
 679 };
 680
 681 static int uml_net_init(void)
 682 {
 683         struct list_head *ele;
 684         struct uml_net_private *lp;
 685         struct in_device *ip;
 686         struct in_ifaddr *in;
 687
 688         mconsole_register_dev(&net_mc);
 689         register_inetaddr_notifier(&uml_inetaddr_notifier);
 690
 691         /* Devices may have been opened already, so the uml_inetaddr_notifier
 692          * didn't get a chance to run for them.  This fakes it so that
 693          * addresses which have already been set up get handled properly.
 694          */
 695         list_for_each(ele, &opened){
 696                 lp = list_entry(ele, struct uml_net_private, list);
 697                 ip = lp->dev->ip_ptr;
 698                 if(ip == NULL) continue;
 699                 in = ip->ifa_list;
 700                 while(in != NULL){
 701                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 702                         in = in->ifa_next;
 703                 }
 704         }
 705
 706         return(0);
 707 }
 708
 709 __initcall(uml_net_init);
 710
 711 static void close_devices(void)
 712 {
 713         struct list_head *ele;
 714         struct uml_net_private *lp;
 715
 716         list_for_each(ele, &opened){
 717                 lp = list_entry(ele, struct uml_net_private, list);
 718                 if((lp->close != NULL) && (lp->fd >= 0))
 719                         (*lp->close)(lp->fd, &lp->user);
 720                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 721         }
 722 }
 723
 724 __uml_exitcall(close_devices);
 725
 726 int setup_etheraddr(char *str, unsigned char *addr)
 727 {
 728         char *end;
 729         int i;
 730
 731         if(str == NULL)
 732                 return(0);
 733         for(i=0;i<6;i++){
 734                 addr[i] = simple_strtoul(str, &end, 16);
 735                 if((end == str) ||
 736                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 737                         printk(KERN_ERR
 738                                "setup_etheraddr: failed to parse '%s' "
 739                                "as an ethernet address\n", str);
 740                         return(0);
 741                 }
 742                 str = end + 1;
 743         }
 744         if(addr[0] & 1){
 745                 printk(KERN_ERR
 746                        "Attempt to assign a broadcast ethernet address to a "
 747                        "device disallowed\n");
 748                 return(0);
 749         }
 750         return(1);
 751 }
 752
 753 void dev_ip_addr(void *d, unsigned char *bin_buf)
 754 {
 755         struct net_device *dev = d;
 756         struct in_device *ip = dev->ip_ptr;
 757         struct in_ifaddr *in;
 758
 759         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 760                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 761                        "IP address\n");
 762                 return;
 763         }
 764         memcpy(bin_buf, &in->ifa_address, sizeof(in->ifa_address));
 765 }
 766
 767 void set_ether_mac(void *d, unsigned char *addr)
 768 {
 769         struct net_device *dev = d;
 770
 771         memcpy(dev->dev_addr, addr, ETH_ALEN);
 772 }
 773
 774 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 775 {
 776         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 777                 struct sk_buff *skb2;
 778
 779                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 780                 dev_kfree_skb(skb);
 781                 skb = skb2;
 782         }
 783         if(skb != NULL) skb_put(skb, extra);
 784         return(skb);
 785 }
 786
 787 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 788                                         void *),
 789                     void *arg)
 790 {
 791         struct net_device *dev = d;
 792         struct in_device *ip = dev->ip_ptr;
 793         struct in_ifaddr *in;
 794         unsigned char address[4], netmask[4];
 795
 796         if(ip == NULL) return;
 797         in = ip->ifa_list;
 798         while(in != NULL){
 799                 memcpy(address, &in->ifa_address, sizeof(address));
 800                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
 801                 (*cb)(address, netmask, arg);
 802                 in = in->ifa_next;
 803         }
 804 }
 805
 806 int dev_netmask(void *d, void *m)
 807 {
 808         struct net_device *dev = d;
 809         struct in_device *ip = dev->ip_ptr;
 810         struct in_ifaddr *in;
 811         __u32 *mask_out = m;
 812
 813         if(ip == NULL)
 814                 return(1);
 815
 816         in = ip->ifa_list;
 817         if(in == NULL)
 818                 return(1);
 819
 820         *mask_out = in->ifa_mask;
 821         return(0);
 822 }
 823
 824 void *get_output_buffer(int *len_out)
 825 {
 826         void *ret;
 827
 828         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 829         if(ret) *len_out = PAGE_SIZE;
 830         else *len_out = 0;
 831         return(ret);
 832 }
 833
 834 void free_output_buffer(void *buffer)
 835 {
 836         free_pages((unsigned long) buffer, 0);
 837 }
 838
 839 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 840                      char **gate_addr)
 841 {
 842         char *remain;
 843
 844         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 845         if(remain != NULL){
 846                 printk("tap_setup_common - Extra garbage on specification : "
 847                        "'%s'\n", remain);
 848                 return(1);
 849         }
 850
 851         return(0);
 852 }
 853
 854 unsigned short eth_protocol(struct sk_buff *skb)
 855 {
 856         return(eth_type_trans(skb, skb->dev));
 857 }
 858
 859 /*
 860  * Overrides for Emacs so that we follow Linus's tabbing style.
 861  * Emacs will notice this stuff at the end of the file and automatically
 862  * adjust the settings for this buffer only.  This must remain at the end
 863  * of the file.
 864  * ---------------------------------------------------------------------------
 865  * Local variables:
 866  * c-file-style: "linux"
 867  * End:
 868  */