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 "asm/uaccess.h"
  24 #include "user_util.h"
  25 #include "kern_util.h"
  26 #include "net_kern.h"
  27 #include "net_user.h"
  28 #include "mconsole_kern.h"
  29 #include "init.h"
  30 #include "irq_user.h"
  31 #include "irq_kern.h"
  32
  33 static spinlock_t opened_lock = SPIN_LOCK_UNLOCKED;
  34 LIST_HEAD(opened);
  35
  36 static int uml_net_rx(struct net_device *dev)
  37 {
  38         struct uml_net_private *lp = dev->priv;
  39         int pkt_len;
  40         struct sk_buff *skb;
  41
  42         /* If we can't allocate memory, try again next round. */
  43         skb = dev_alloc_skb(dev->mtu);
  44         if (skb == NULL) {
  45                 lp->stats.rx_dropped++;
  46                 return 0;
  47         }
  48
  49         skb->dev = dev;
  50         skb_put(skb, dev->mtu);
  51         skb->mac.raw = skb->data;
  52         pkt_len = (*lp->read)(lp->fd, &skb, lp);
  53
  54         if (pkt_len > 0) {
  55                 skb_trim(skb, pkt_len);
  56                 skb->protocol = (*lp->protocol)(skb);
  57                 netif_rx(skb);
  58
  59                 lp->stats.rx_bytes += skb->len;
  60                 lp->stats.rx_packets++;
  61                 return pkt_len;
  62         }
  63
  64         kfree_skb(skb);
  65         return pkt_len;
  66 }
  67
  68 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  69 {
  70         struct net_device *dev = dev_id;
  71         struct uml_net_private *lp = dev->priv;
  72         int err;
  73
  74         if(!netif_running(dev))
  75                 return(IRQ_NONE);
  76
  77         spin_lock(&lp->lock);
  78         while((err = uml_net_rx(dev)) > 0) ;
  79         if(err < 0) {
  80                 printk(KERN_ERR
  81                        "Device '%s' read returned %d, shutting it down\n",
  82                        dev->name, err);
  83                 dev_close(dev);
  84                 goto out;
  85         }
  86         reactivate_fd(lp->fd, UM_ETH_IRQ);
  87
  88  out:
  89         spin_unlock(&lp->lock);
  90         return(IRQ_HANDLED);
  91 }
  92
  93 static int uml_net_open(struct net_device *dev)
  94 {
  95         struct uml_net_private *lp = dev->priv;
  96         char addr[sizeof("255.255.255.255\0")];
  97         int err;
  98
  99         spin_lock(&lp->lock);
 100
 101         if(lp->fd >= 0){
 102                 err = -ENXIO;
 103                 goto out;
 104         }
 105
 106         if(!lp->have_mac){
 107                 dev_ip_addr(dev, addr, &lp->mac[2]);
 108                 set_ether_mac(dev, lp->mac);
 109         }
 110
 111         lp->fd = (*lp->open)(&lp->user);
 112         if(lp->fd < 0){
 113                 err = lp->fd;
 114                 goto out;
 115         }
 116
 117         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
 118                              SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
 119         if(err != 0){
 120                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
 121                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 122                 lp->fd = -1;
 123                 err = -ENETUNREACH;
 124         }
 125
 126         lp->tl.data = (unsigned long) &lp->user;
 127         netif_start_queue(dev);
 128
 129         spin_lock(&opened_lock);
 130         list_add(&lp->list, &opened);
 131         spin_unlock(&opened_lock);
 132
 133         /* clear buffer - it can happen that the host side of the interface
 134          * is full when we get here.  In this case, new data is never queued,
 135          * SIGIOs never arrive, and the net never works.
 136          */
 137         while((err = uml_net_rx(dev)) > 0) ;
 138
 139  out:
 140         spin_unlock(&lp->lock);
 141         return(err);
 142 }
 143
 144 static int uml_net_close(struct net_device *dev)
 145 {
 146         struct uml_net_private *lp = dev->priv;
 147
 148         netif_stop_queue(dev);
 149         spin_lock(&lp->lock);
 150
 151         free_irq(dev->irq, dev);
 152         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 153         lp->fd = -1;
 154         spin_lock(&opened_lock);
 155         list_del(&lp->list);
 156         spin_unlock(&opened_lock);
 157
 158         spin_unlock(&lp->lock);
 159         return 0;
 160 }
 161
 162 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 163 {
 164         struct uml_net_private *lp = dev->priv;
 165         unsigned long flags;
 166         int len;
 167
 168         netif_stop_queue(dev);
 169
 170         spin_lock_irqsave(&lp->lock, flags);
 171
 172         len = (*lp->write)(lp->fd, &skb, lp);
 173
 174         if(len == skb->len) {
 175                 lp->stats.tx_packets++;
 176                 lp->stats.tx_bytes += skb->len;
 177                 dev->trans_start = jiffies;
 178                 netif_start_queue(dev);
 179
 180                 /* this is normally done in the interrupt when tx finishes */
 181                 netif_wake_queue(dev);
 182         }
 183         else if(len == 0){
 184                 netif_start_queue(dev);
 185                 lp->stats.tx_dropped++;
 186         }
 187         else {
 188                 netif_start_queue(dev);
 189                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
 190         }
 191
 192         spin_unlock_irqrestore(&lp->lock, flags);
 193
 194         dev_kfree_skb(skb);
 195
 196         return 0;
 197 }
 198
 199 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
 200 {
 201         struct uml_net_private *lp = dev->priv;
 202         return &lp->stats;
 203 }
 204
 205 static void uml_net_set_multicast_list(struct net_device *dev)
 206 {
 207         if (dev->flags & IFF_PROMISC) return;
 208         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
 209         else dev->flags &= ~IFF_ALLMULTI;
 210 }
 211
 212 static void uml_net_tx_timeout(struct net_device *dev)
 213 {
 214         dev->trans_start = jiffies;
 215         netif_wake_queue(dev);
 216 }
 217
 218 static int uml_net_set_mac(struct net_device *dev, void *addr)
 219 {
 220         struct uml_net_private *lp = dev->priv;
 221         struct sockaddr *hwaddr = addr;
 222
 223         spin_lock(&lp->lock);
 224         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
 225         spin_unlock(&lp->lock);
 226
 227         return(0);
 228 }
 229
 230 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
 231 {
 232         struct uml_net_private *lp = dev->priv;
 233         int err = 0;
 234
 235         spin_lock(&lp->lock);
 236
 237         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
 238         if(new_mtu < 0){
 239                 err = new_mtu;
 240                 goto out;
 241         }
 242
 243         dev->mtu = new_mtu;
 244
 245  out:
 246         spin_unlock(&lp->lock);
 247         return err;
 248 }
 249
 250 static int uml_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 251 {
 252         static const struct ethtool_drvinfo info = {
 253                 .cmd     = ETHTOOL_GDRVINFO,
 254                 .driver  = "uml virtual ethernet",
 255                 .version = "42",
 256         };
 257         void *useraddr;
 258         u32 ethcmd;
 259
 260         switch (cmd) {
 261         case SIOCETHTOOL:
 262                 useraddr = ifr->ifr_data;
 263                 if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
 264                         return -EFAULT;
 265                 switch (ethcmd) {
 266                 case ETHTOOL_GDRVINFO:
 267                         if (copy_to_user(useraddr, &info, sizeof(info)))
 268                                 return -EFAULT;
 269                         return 0;
 270                 default:
 271                         return -EOPNOTSUPP;
 272                 }
 273         default:
 274                 return -EINVAL;
 275         }
 276 }
 277
 278 void uml_net_user_timer_expire(unsigned long _conn)
 279 {
 280 #ifdef undef
 281         struct connection *conn = (struct connection *)_conn;
 282
 283         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
 284         do_connect(conn);
 285 #endif
 286 }
 287
 288 static spinlock_t devices_lock = SPIN_LOCK_UNLOCKED;
 289 static struct list_head devices = LIST_HEAD_INIT(devices);
 290
 291 static int eth_configure(int n, void *init, char *mac,
 292                          struct transport *transport)
 293 {
 294         struct uml_net *device;
 295         struct net_device *dev;
 296         struct uml_net_private *lp;
 297         int save, err, size;
 298
 299         size = transport->private_size + sizeof(struct uml_net_private) +
 300                 sizeof(((struct uml_net_private *) 0)->user);
 301
 302         device = kmalloc(sizeof(*device), GFP_KERNEL);
 303         if (device == NULL) {
 304                 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
 305                 return(1);
 306         }
 307
 308         memset(device, 0, sizeof(*device));
 309         INIT_LIST_HEAD(&device->list);
 310         device->index = n;
 311
 312         spin_lock(&devices_lock);
 313         list_add(&device->list, &devices);
 314         spin_unlock(&devices_lock);
 315
 316         if (setup_etheraddr(mac, device->mac))
 317                 device->have_mac = 1;
 318
 319         printk(KERN_INFO "Netdevice %d ", n);
 320         if (device->have_mac)
 321                 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
 322                        device->mac[0], device->mac[1],
 323                        device->mac[2], device->mac[3],
 324                        device->mac[4], device->mac[5]);
 325         printk(": ");
 326         dev = alloc_etherdev(size);
 327         if (dev == NULL) {
 328                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 329                 return 1;
 330         }
 331
 332         /* If this name ends up conflicting with an existing registered
 333          * netdevice, that is OK, register_netdev{,ice}() will notice this
 334          * and fail.
 335          */
 336         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
 337         device->dev = dev;
 338
 339         (*transport->kern->init)(dev, init);
 340
 341         dev->mtu = transport->user->max_packet;
 342         dev->open = uml_net_open;
 343         dev->hard_start_xmit = uml_net_start_xmit;
 344         dev->stop = uml_net_close;
 345         dev->get_stats = uml_net_get_stats;
 346         dev->set_multicast_list = uml_net_set_multicast_list;
 347         dev->tx_timeout = uml_net_tx_timeout;
 348         dev->set_mac_address = uml_net_set_mac;
 349         dev->change_mtu = uml_net_change_mtu;
 350         dev->do_ioctl = uml_net_ioctl;
 351         dev->watchdog_timeo = (HZ >> 1);
 352         dev->irq = UM_ETH_IRQ;
 353
 354         rtnl_lock();
 355         err = register_netdevice(dev);
 356         rtnl_unlock();
 357         if (err) {
 358                 device->dev = NULL;
 359                 /* XXX: should we call ->remove() here? */
 360                 free_netdev(dev);
 361                 return 1;
 362         }
 363         lp = dev->priv;
 364
 365         /* lp.user is the first four bytes of the transport data, which
 366          * has already been initialized.  This structure assignment will
 367          * overwrite that, so we make sure that .user gets overwritten with
 368          * what it already has.
 369          */
 370         save = lp->user[0];
 371         *lp = ((struct uml_net_private)
 372                 { .list                 = LIST_HEAD_INIT(lp->list),
 373                   .lock                 = SPIN_LOCK_UNLOCKED,
 374                   .dev                  = dev,
 375                   .fd                   = -1,
 376                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
 377                   .have_mac             = device->have_mac,
 378                   .protocol             = transport->kern->protocol,
 379                   .open                 = transport->user->open,
 380                   .close                = transport->user->close,
 381                   .remove               = transport->user->remove,
 382                   .read                 = transport->kern->read,
 383                   .write                = transport->kern->write,
 384                   .add_address          = transport->user->add_address,
 385                   .delete_address       = transport->user->delete_address,
 386                   .set_mtu              = transport->user->set_mtu,
 387                   .user                 = { save } });
 388
 389         init_timer(&lp->tl);
 390         lp->tl.function = uml_net_user_timer_expire;
 391         if (lp->have_mac)
 392                 memcpy(lp->mac, device->mac, sizeof(lp->mac));
 393
 394         if (transport->user->init)
 395                 (*transport->user->init)(&lp->user, dev);
 396
 397         if (device->have_mac)
 398                 set_ether_mac(dev, device->mac);
 399         return(0);
 400 }
 401
 402 static struct uml_net *find_device(int n)
 403 {
 404         struct uml_net *device;
 405         struct list_head *ele;
 406
 407         spin_lock(&devices_lock);
 408         list_for_each(ele, &devices){
 409                 device = list_entry(ele, struct uml_net, list);
 410                 if(device->index == n)
 411                         goto out;
 412         }
 413         device = NULL;
 414  out:
 415         spin_unlock(&devices_lock);
 416         return(device);
 417 }
 418
 419 static int eth_parse(char *str, int *index_out, char **str_out)
 420 {
 421         char *end;
 422         int n;
 423
 424         n = simple_strtoul(str, &end, 0);
 425         if(end == str){
 426                 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
 427                 return(1);
 428         }
 429         if(n < 0){
 430                 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
 431                 return(1);
 432         }
 433         str = end;
 434         if(*str != '='){
 435                 printk(KERN_ERR
 436                        "eth_setup: expected '=' after device number\n");
 437                 return(1);
 438         }
 439         str++;
 440         if(find_device(n)){
 441                 printk(KERN_ERR "eth_setup: Device %d already configured\n",
 442                        n);
 443                 return(1);
 444         }
 445         if(index_out) *index_out = n;
 446         *str_out = str;
 447         return(0);
 448 }
 449
 450 struct eth_init {
 451         struct list_head list;
 452         char *init;
 453         int index;
 454 };
 455
 456 /* Filled in at boot time.  Will need locking if the transports become
 457  * modular.
 458  */
 459 struct list_head transports = LIST_HEAD_INIT(transports);
 460
 461 /* Filled in during early boot */
 462 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 463
 464 static int check_transport(struct transport *transport, char *eth, int n,
 465                            void **init_out, char **mac_out)
 466 {
 467         int len;
 468
 469         len = strlen(transport->name);
 470         if(strncmp(eth, transport->name, len))
 471                 return(0);
 472
 473         eth += len;
 474         if(*eth == ',')
 475                 eth++;
 476         else if(*eth != '\0')
 477                 return(0);
 478
 479         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
 480         if(*init_out == NULL)
 481                 return(1);
 482
 483         if(!transport->setup(eth, mac_out, *init_out)){
 484                 kfree(*init_out);
 485                 *init_out = NULL;
 486         }
 487         return(1);
 488 }
 489
 490 void register_transport(struct transport *new)
 491 {
 492         struct list_head *ele, *next;
 493         struct eth_init *eth;
 494         void *init;
 495         char *mac = NULL;
 496         int match;
 497
 498         list_add(&new->list, &transports);
 499
 500         list_for_each_safe(ele, next, &eth_cmd_line){
 501                 eth = list_entry(ele, struct eth_init, list);
 502                 match = check_transport(new, eth->init, eth->index, &init,
 503                                         &mac);
 504                 if(!match)
 505                         continue;
 506                 else if(init != NULL){
 507                         eth_configure(eth->index, init, mac, new);
 508                         kfree(init);
 509                 }
 510                 list_del(&eth->list);
 511         }
 512 }
 513
 514 static int eth_setup_common(char *str, int index)
 515 {
 516         struct list_head *ele;
 517         struct transport *transport;
 518         void *init;
 519         char *mac = NULL;
 520
 521         list_for_each(ele, &transports){
 522                 transport = list_entry(ele, struct transport, list);
 523                 if(!check_transport(transport, str, index, &init, &mac))
 524                         continue;
 525                 if(init != NULL){
 526                         eth_configure(index, init, mac, transport);
 527                         kfree(init);
 528                 }
 529                 return(1);
 530         }
 531         return(0);
 532 }
 533
 534 static int eth_setup(char *str)
 535 {
 536         struct eth_init *new;
 537         int n, err;
 538
 539         err = eth_parse(str, &n, &str);
 540         if(err) return(1);
 541
 542         new = alloc_bootmem(sizeof(new));
 543         if (new == NULL){
 544                 printk("eth_init : alloc_bootmem failed\n");
 545                 return(1);
 546         }
 547
 548         INIT_LIST_HEAD(&new->list);
 549         new->index = n;
 550         new->init = str;
 551
 552         list_add_tail(&new->list, &eth_cmd_line);
 553         return(1);
 554 }
 555
 556 __setup("eth", eth_setup);
 557 __uml_help(eth_setup,
 558 "eth[0-9]+=<transport>,<options>\n"
 559 "    Configure a network device.\n\n"
 560 );
 561
 562 static int eth_init(void)
 563 {
 564         struct list_head *ele, *next;
 565         struct eth_init *eth;
 566
 567         list_for_each_safe(ele, next, &eth_cmd_line){
 568                 eth = list_entry(ele, struct eth_init, list);
 569
 570                 if(eth_setup_common(eth->init, eth->index))
 571                         list_del(&eth->list);
 572         }
 573
 574         return(1);
 575 }
 576
 577 __initcall(eth_init);
 578
 579 static int net_config(char *str)
 580 {
 581         int n, err;
 582
 583         err = eth_parse(str, &n, &str);
 584         if(err) return(err);
 585
 586         str = uml_strdup(str);
 587         if(str == NULL){
 588                 printk(KERN_ERR "net_config failed to strdup string\n");
 589                 return(-1);
 590         }
 591         err = !eth_setup_common(str, n);
 592         if(err)
 593                 kfree(str);
 594         return(err);
 595 }
 596
 597 static int net_remove(char *str)
 598 {
 599         struct uml_net *device;
 600         struct net_device *dev;
 601         struct uml_net_private *lp;
 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         device = find_device(n);
 610         if(device == NULL)
 611                 return(0);
 612
 613         dev = device->dev;
 614         lp = dev->priv;
 615         if(lp->fd > 0) return(-1);
 616         if(lp->remove != NULL) (*lp->remove)(&lp->user);
 617         unregister_netdev(dev);
 618
 619         list_del(&device->list);
 620         kfree(device);
 621         free_netdev(dev);
 622         return(0);
 623 }
 624
 625 static struct mc_device net_mc = {
 626         .name           = "eth",
 627         .config         = net_config,
 628         .get_config     = NULL,
 629         .remove         = net_remove,
 630 };
 631
 632 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
 633                               void *ptr)
 634 {
 635         struct in_ifaddr *ifa = ptr;
 636         u32 addr = ifa->ifa_address;
 637         u32 netmask = ifa->ifa_mask;
 638         struct net_device *dev = ifa->ifa_dev->dev;
 639         struct uml_net_private *lp;
 640         void (*proc)(unsigned char *, unsigned char *, void *);
 641         unsigned char addr_buf[4], netmask_buf[4];
 642
 643         if(dev->open != uml_net_open) return(NOTIFY_DONE);
 644
 645         lp = dev->priv;
 646
 647         proc = NULL;
 648         switch (event){
 649         case NETDEV_UP:
 650                 proc = lp->add_address;
 651                 break;
 652         case NETDEV_DOWN:
 653                 proc = lp->delete_address;
 654                 break;
 655         }
 656         if(proc != NULL){
 657                 addr_buf[0] = addr & 0xff;
 658                 addr_buf[1] = (addr >> 8) & 0xff;
 659                 addr_buf[2] = (addr >> 16) & 0xff;
 660                 addr_buf[3] = addr >> 24;
 661                 netmask_buf[0] = netmask & 0xff;
 662                 netmask_buf[1] = (netmask >> 8) & 0xff;
 663                 netmask_buf[2] = (netmask >> 16) & 0xff;
 664                 netmask_buf[3] = netmask >> 24;
 665                 (*proc)(addr_buf, netmask_buf, &lp->user);
 666         }
 667         return(NOTIFY_DONE);
 668 }
 669
 670 struct notifier_block uml_inetaddr_notifier = {
 671         .notifier_call          = uml_inetaddr_event,
 672 };
 673
 674 static int uml_net_init(void)
 675 {
 676         struct list_head *ele;
 677         struct uml_net_private *lp;
 678         struct in_device *ip;
 679         struct in_ifaddr *in;
 680
 681         mconsole_register_dev(&net_mc);
 682         register_inetaddr_notifier(&uml_inetaddr_notifier);
 683
 684         /* Devices may have been opened already, so the uml_inetaddr_notifier
 685          * didn't get a chance to run for them.  This fakes it so that
 686          * addresses which have already been set up get handled properly.
 687          */
 688         list_for_each(ele, &opened){
 689                 lp = list_entry(ele, struct uml_net_private, list);
 690                 ip = lp->dev->ip_ptr;
 691                 if(ip == NULL) continue;
 692                 in = ip->ifa_list;
 693                 while(in != NULL){
 694                         uml_inetaddr_event(NULL, NETDEV_UP, in);
 695                         in = in->ifa_next;
 696                 }
 697         }
 698
 699         return(0);
 700 }
 701
 702 __initcall(uml_net_init);
 703
 704 static void close_devices(void)
 705 {
 706         struct list_head *ele;
 707         struct uml_net_private *lp;
 708
 709         list_for_each(ele, &opened){
 710                 lp = list_entry(ele, struct uml_net_private, list);
 711                 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
 712                 if(lp->remove != NULL) (*lp->remove)(&lp->user);
 713         }
 714 }
 715
 716 __uml_exitcall(close_devices);
 717
 718 int setup_etheraddr(char *str, unsigned char *addr)
 719 {
 720         char *end;
 721         int i;
 722
 723         if(str == NULL)
 724                 return(0);
 725         for(i=0;i<6;i++){
 726                 addr[i] = simple_strtoul(str, &end, 16);
 727                 if((end == str) ||
 728                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
 729                         printk(KERN_ERR
 730                                "setup_etheraddr: failed to parse '%s' "
 731                                "as an ethernet address\n", str);
 732                         return(0);
 733                 }
 734                 str = end + 1;
 735         }
 736         if(addr[0] & 1){
 737                 printk(KERN_ERR
 738                        "Attempt to assign a broadcast ethernet address to a "
 739                        "device disallowed\n");
 740                 return(0);
 741         }
 742         return(1);
 743 }
 744
 745 void dev_ip_addr(void *d, char *buf, char *bin_buf)
 746 {
 747         struct net_device *dev = d;
 748         struct in_device *ip = dev->ip_ptr;
 749         struct in_ifaddr *in;
 750         u32 addr;
 751
 752         if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
 753                 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
 754                        "IP address\n");
 755                 return;
 756         }
 757         addr = in->ifa_address;
 758         sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff,
 759                 (addr >> 16) & 0xff, addr >> 24);
 760         if(bin_buf){
 761                 bin_buf[0] = addr & 0xff;
 762                 bin_buf[1] = (addr >> 8) & 0xff;
 763                 bin_buf[2] = (addr >> 16) & 0xff;
 764                 bin_buf[3] = addr >> 24;
 765         }
 766 }
 767
 768 void set_ether_mac(void *d, unsigned char *addr)
 769 {
 770         struct net_device *dev = d;
 771
 772         memcpy(dev->dev_addr, addr, ETH_ALEN);
 773 }
 774
 775 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 776 {
 777         if((skb != NULL) && (skb_tailroom(skb) < extra)){
 778                 struct sk_buff *skb2;
 779
 780                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 781                 dev_kfree_skb(skb);
 782                 skb = skb2;
 783         }
 784         if(skb != NULL) skb_put(skb, extra);
 785         return(skb);
 786 }
 787
 788 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
 789                                         void *),
 790                     void *arg)
 791 {
 792         struct net_device *dev = d;
 793         struct in_device *ip = dev->ip_ptr;
 794         struct in_ifaddr *in;
 795         unsigned char address[4], netmask[4];
 796
 797         if(ip == NULL) return;
 798         in = ip->ifa_list;
 799         while(in != NULL){
 800                 address[0] = in->ifa_address & 0xff;
 801                 address[1] = (in->ifa_address >> 8) & 0xff;
 802                 address[2] = (in->ifa_address >> 16) & 0xff;
 803                 address[3] = in->ifa_address >> 24;
 804                 netmask[0] = in->ifa_mask & 0xff;
 805                 netmask[1] = (in->ifa_mask >> 8) & 0xff;
 806                 netmask[2] = (in->ifa_mask >> 16) & 0xff;
 807                 netmask[3] = in->ifa_mask >> 24;
 808                 (*cb)(address, netmask, arg);
 809                 in = in->ifa_next;
 810         }
 811 }
 812
 813 int dev_netmask(void *d, void *m)
 814 {
 815         struct net_device *dev = d;
 816         struct in_device *ip = dev->ip_ptr;
 817         struct in_ifaddr *in;
 818         __u32 *mask_out = m;
 819
 820         if(ip == NULL)
 821                 return(1);
 822
 823         in = ip->ifa_list;
 824         if(in == NULL)
 825                 return(1);
 826
 827         *mask_out = in->ifa_mask;
 828         return(0);
 829 }
 830
 831 void *get_output_buffer(int *len_out)
 832 {
 833         void *ret;
 834
 835         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
 836         if(ret) *len_out = PAGE_SIZE;
 837         else *len_out = 0;
 838         return(ret);
 839 }
 840
 841 void free_output_buffer(void *buffer)
 842 {
 843         free_pages((unsigned long) buffer, 0);
 844 }
 845
 846 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
 847                      char **gate_addr)
 848 {
 849         char *remain;
 850
 851         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
 852         if(remain != NULL){
 853                 printk("tap_setup_common - Extra garbage on specification : "
 854                        "'%s'\n", remain);
 855                 return(1);
 856         }
 857
 858         return(0);
 859 }
 860
 861 unsigned short eth_protocol(struct sk_buff *skb)
 862 {
 863         return(eth_type_trans(skb, skb->dev));
 864 }
 865
 866 /*
 867  * Overrides for Emacs so that we follow Linus's tabbing style.
 868  * Emacs will notice this stuff at the end of the file and automatically
 869  * adjust the settings for this buffer only.  This must remain at the end
 870  * of the file.
 871  * ---------------------------------------------------------------------------
 872  * Local variables:
 873  * c-file-style: "linux"
 874  * End:
 875  */