1/* 2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 4 * James Leu (jleu@mindspring.net). 5 * Copyright (C) 2001 by various other people who didn't put their name here. 6 * Licensed under the GPL. 7 */ 8 9#include <linux/bootmem.h> 10#include <linux/etherdevice.h> 11#include <linux/ethtool.h> 12#include <linux/inetdevice.h> 13#include <linux/init.h> 14#include <linux/list.h> 15#include <linux/netdevice.h> 16#include <linux/platform_device.h> 17#include <linux/rtnetlink.h> 18#include <linux/skbuff.h> 19#include <linux/slab.h> 20#include <linux/spinlock.h> 21#include "init.h" 22#include "irq_kern.h" 23#include "irq_user.h" 24#include "mconsole_kern.h" 25#include "net_kern.h" 26#include "net_user.h" 27 28#define DRIVER_NAME "uml-netdev" 29 30static DEFINE_SPINLOCK(opened_lock); 31static LIST_HEAD(opened); 32 33/* 34 * The drop_skb is used when we can't allocate an skb. The 35 * packet is read into drop_skb in order to get the data off the 36 * connection to the host. 37 * It is reallocated whenever a maximum packet size is seen which is 38 * larger than any seen before. update_drop_skb is called from 39 * eth_configure when a new interface is added. 40 */ 41static DEFINE_SPINLOCK(drop_lock); 42static struct sk_buff *drop_skb; 43static int drop_max; 44 45static int update_drop_skb(int max) 46{ 47 struct sk_buff *new; 48 unsigned long flags; 49 int err = 0; 50 51 spin_lock_irqsave(&drop_lock, flags); 52 53 if (max <= drop_max) 54 goto out; 55 56 err = -ENOMEM; 57 new = dev_alloc_skb(max); 58 if (new == NULL) 59 goto out; 60 61 skb_put(new, max); 62 63 kfree_skb(drop_skb); 64 drop_skb = new; 65 drop_max = max; 66 err = 0; 67out: 68 spin_unlock_irqrestore(&drop_lock, flags); 69 70 return err; 71} 72 73static int uml_net_rx(struct net_device *dev) 74{ 75 struct uml_net_private *lp = netdev_priv(dev); 76 int pkt_len; 77 struct sk_buff *skb; 78 79 /* If we can't allocate memory, try again next round. */ 80 skb = dev_alloc_skb(lp->max_packet); 81 if (skb == NULL) { 82 drop_skb->dev = dev; 83 /* Read a packet into drop_skb and don't do anything with it. */ 84 (*lp->read)(lp->fd, drop_skb, lp); 85 dev->stats.rx_dropped++; 86 return 0; 87 } 88 89 skb->dev = dev; 90 skb_put(skb, lp->max_packet); 91 skb_reset_mac_header(skb); 92 pkt_len = (*lp->read)(lp->fd, skb, lp); 93 94 if (pkt_len > 0) { 95 skb_trim(skb, pkt_len); 96 skb->protocol = (*lp->protocol)(skb); 97 98 dev->stats.rx_bytes += skb->len; 99 dev->stats.rx_packets++; 100 netif_rx(skb); 101 return pkt_len; 102 } 103 104 kfree_skb(skb); 105 return pkt_len; 106} 107 108static void uml_dev_close(struct work_struct *work) 109{ 110 struct uml_net_private *lp = 111 container_of(work, struct uml_net_private, work); 112 dev_close(lp->dev); 113} 114 115static irqreturn_t uml_net_interrupt(int irq, void *dev_id) 116{ 117 struct net_device *dev = dev_id; 118 struct uml_net_private *lp = netdev_priv(dev); 119 int err; 120 121 if (!netif_running(dev)) 122 return IRQ_NONE; 123 124 spin_lock(&lp->lock); 125 while ((err = uml_net_rx(dev)) > 0) ; 126 if (err < 0) { 127 printk(KERN_ERR 128 "Device '%s' read returned %d, shutting it down\n", 129 dev->name, err); 130 /* dev_close can't be called in interrupt context, and takes 131 * again lp->lock. 132 * And dev_close() can be safely called multiple times on the 133 * same device, since it tests for (dev->flags & IFF_UP). So 134 * there's no harm in delaying the device shutdown. 135 * Furthermore, the workqueue will not re-enqueue an already 136 * enqueued work item. */ 137 schedule_work(&lp->work); 138 goto out; 139 } 140 reactivate_fd(lp->fd, UM_ETH_IRQ); 141 142out: 143 spin_unlock(&lp->lock); 144 return IRQ_HANDLED; 145} 146 147static int uml_net_open(struct net_device *dev) 148{ 149 struct uml_net_private *lp = netdev_priv(dev); 150 int err; 151 152 if (lp->fd >= 0) { 153 err = -ENXIO; 154 goto out; 155 } 156 157 lp->fd = (*lp->open)(&lp->user); 158 if (lp->fd < 0) { 159 err = lp->fd; 160 goto out; 161 } 162 163 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt, 164 IRQF_DISABLED | IRQF_SHARED, dev->name, dev); 165 if (err != 0) { 166 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err); 167 err = -ENETUNREACH; 168 goto out_close; 169 } 170 171 lp->tl.data = (unsigned long) &lp->user; 172 netif_start_queue(dev); 173 174 /* clear buffer - it can happen that the host side of the interface 175 * is full when we get here. In this case, new data is never queued, 176 * SIGIOs never arrive, and the net never works. 177 */ 178 while ((err = uml_net_rx(dev)) > 0) ; 179 180 spin_lock(&opened_lock); 181 list_add(&lp->list, &opened); 182 spin_unlock(&opened_lock); 183 184 return 0; 185out_close: 186 if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user); 187 lp->fd = -1; 188out: 189 return err; 190} 191 192static int uml_net_close(struct net_device *dev) 193{ 194 struct uml_net_private *lp = netdev_priv(dev); 195 196 netif_stop_queue(dev); 197 198 free_irq(dev->irq, dev); 199 if (lp->close != NULL) 200 (*lp->close)(lp->fd, &lp->user); 201 lp->fd = -1; 202 203 spin_lock(&opened_lock); 204 list_del(&lp->list); 205 spin_unlock(&opened_lock); 206 207 return 0; 208} 209 210static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) 211{ 212 struct uml_net_private *lp = netdev_priv(dev); 213 unsigned long flags; 214 int len; 215 216 netif_stop_queue(dev); 217 218 spin_lock_irqsave(&lp->lock, flags); 219 220 len = (*lp->write)(lp->fd, skb, lp); 221 222 if (len == skb->len) { 223 dev->stats.tx_packets++; 224 dev->stats.tx_bytes += skb->len; 225 dev->trans_start = jiffies; 226 netif_start_queue(dev); 227 228 /* this is normally done in the interrupt when tx finishes */ 229 netif_wake_queue(dev); 230 } 231 else if (len == 0) { 232 netif_start_queue(dev); 233 dev->stats.tx_dropped++; 234 } 235 else { 236 netif_start_queue(dev); 237 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len); 238 } 239 240 spin_unlock_irqrestore(&lp->lock, flags); 241 242 dev_kfree_skb(skb); 243 244 return NETDEV_TX_OK; 245} 246 247static void uml_net_set_multicast_list(struct net_device *dev) 248{ 249 return; 250} 251 252static void uml_net_tx_timeout(struct net_device *dev) 253{ 254 dev->trans_start = jiffies; 255 netif_wake_queue(dev); 256} 257 258static int uml_net_change_mtu(struct net_device *dev, int new_mtu) 259{ 260 dev->mtu = new_mtu; 261 262 return 0; 263} 264 265static void uml_net_get_drvinfo(struct net_device *dev, 266 struct ethtool_drvinfo *info) 267{ 268 strcpy(info->driver, DRIVER_NAME); 269 strcpy(info->version, "42"); 270} 271 272static const struct ethtool_ops uml_net_ethtool_ops = { 273 .get_drvinfo = uml_net_get_drvinfo, 274 .get_link = ethtool_op_get_link, 275}; 276 277static void uml_net_user_timer_expire(unsigned long _conn) 278{ 279#ifdef undef 280 struct connection *conn = (struct connection *)_conn; 281 282 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn); 283 do_connect(conn); 284#endif 285} 286 287static void setup_etheraddr(char *str, unsigned char *addr, char *name) 288{ 289 char *end; 290 int i; 291 292 if (str == NULL) 293 goto random; 294 295 for (i = 0; i < 6; i++) { 296 addr[i] = simple_strtoul(str, &end, 16); 297 if ((end == str) || 298 ((*end != ':') && (*end != ',') && (*end != '\0'))) { 299 printk(KERN_ERR 300 "setup_etheraddr: failed to parse '%s' " 301 "as an ethernet address\n", str); 302 goto random; 303 } 304 str = end + 1; 305 } 306 if (is_multicast_ether_addr(addr)) { 307 printk(KERN_ERR 308 "Attempt to assign a multicast ethernet address to a " 309 "device disallowed\n"); 310 goto random; 311 } 312 if (!is_valid_ether_addr(addr)) { 313 printk(KERN_ERR 314 "Attempt to assign an invalid ethernet address to a " 315 "device disallowed\n"); 316 goto random; 317 } 318 if (!is_local_ether_addr(addr)) { 319 printk(KERN_WARNING 320 "Warning: Assigning a globally valid ethernet " 321 "address to a device\n"); 322 printk(KERN_WARNING "You should set the 2nd rightmost bit in " 323 "the first byte of the MAC,\n"); 324 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", 325 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], 326 addr[5]); 327 } 328 return; 329 330random: 331 printk(KERN_INFO 332 "Choosing a random ethernet address for device %s\n", name); 333 random_ether_addr(addr); 334} 335 336static DEFINE_SPINLOCK(devices_lock); 337static LIST_HEAD(devices); 338 339static struct platform_driver uml_net_driver = { 340 .driver = { 341 .name = DRIVER_NAME, 342 }, 343}; 344 345static void net_device_release(struct device *dev) 346{ 347 struct uml_net *device = dev_get_drvdata(dev); 348 struct net_device *netdev = device->dev; 349 struct uml_net_private *lp = netdev_priv(netdev); 350 351 if (lp->remove != NULL) 352 (*lp->remove)(&lp->user); 353 list_del(&device->list); 354 kfree(device); 355 free_netdev(netdev); 356} 357 358static const struct net_device_ops uml_netdev_ops = { 359 .ndo_open = uml_net_open, 360 .ndo_stop = uml_net_close, 361 .ndo_start_xmit = uml_net_start_xmit, 362 .ndo_set_multicast_list = uml_net_set_multicast_list, 363 .ndo_tx_timeout = uml_net_tx_timeout, 364 .ndo_set_mac_address = eth_mac_addr, 365 .ndo_change_mtu = uml_net_change_mtu, 366 .ndo_validate_addr = eth_validate_addr, 367}; 368 369/* 370 * Ensures that platform_driver_register is called only once by 371 * eth_configure. Will be set in an initcall. 372 */ 373static int driver_registered; 374 375static void eth_configure(int n, void *init, char *mac, 376 struct transport *transport) 377{ 378 struct uml_net *device; 379 struct net_device *dev; 380 struct uml_net_private *lp; 381 int err, size; 382 383 size = transport->private_size + sizeof(struct uml_net_private); 384 385 device = kzalloc(sizeof(*device), GFP_KERNEL); 386 if (device == NULL) { 387 printk(KERN_ERR "eth_configure failed to allocate struct " 388 "uml_net\n"); 389 return; 390 } 391 392 dev = alloc_etherdev(size); 393 if (dev == NULL) { 394 printk(KERN_ERR "eth_configure: failed to allocate struct " 395 "net_device for eth%d\n", n); 396 goto out_free_device; 397 } 398 399 INIT_LIST_HEAD(&device->list); 400 device->index = n; 401 402 /* If this name ends up conflicting with an existing registered 403 * netdevice, that is OK, register_netdev{,ice}() will notice this 404 * and fail. 405 */ 406 snprintf(dev->name, sizeof(dev->name), "eth%d", n); 407 408 setup_etheraddr(mac, device->mac, dev->name); 409 410 printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac); 411 412 lp = netdev_priv(dev); 413 /* This points to the transport private data. It's still clear, but we 414 * must memset it to 0 *now*. Let's help the drivers. */ 415 memset(lp, 0, size); 416 INIT_WORK(&lp->work, uml_dev_close); 417 418 /* sysfs register */ 419 if (!driver_registered) { 420 platform_driver_register(¨_net_driver); 421 driver_registered = 1; 422 } 423 device->pdev.id = n; 424 device->pdev.name = DRIVER_NAME; 425 device->pdev.dev.release = net_device_release; 426 dev_set_drvdata(&device->pdev.dev, device); 427 if (platform_device_register(&device->pdev)) 428 goto out_free_netdev; 429 SET_NETDEV_DEV(dev,&device->pdev.dev); 430 431 device->dev = dev; 432 433 /* 434 * These just fill in a data structure, so there's no failure 435 * to be worried about. 436 */ 437 (*transport->kern->init)(dev, init); 438 439 *lp = ((struct uml_net_private) 440 { .list = LIST_HEAD_INIT(lp->list), 441 .dev = dev, 442 .fd = -1, 443 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, 444 .max_packet = transport->user->max_packet, 445 .protocol = transport->kern->protocol, 446 .open = transport->user->open, 447 .close = transport->user->close, 448 .remove = transport->user->remove, 449 .read = transport->kern->read, 450 .write = transport->kern->write, 451 .add_address = transport->user->add_address, 452 .delete_address = transport->user->delete_address }); 453 454 init_timer(&lp->tl); 455 spin_lock_init(&lp->lock); 456 lp->tl.function = uml_net_user_timer_expire; 457 memcpy(lp->mac, device->mac, sizeof(lp->mac)); 458 459 if ((transport->user->init != NULL) && 460 ((*transport->user->init)(&lp->user, dev) != 0)) 461 goto out_unregister; 462 463 /* don't use eth_mac_addr, it will not work here */ 464 memcpy(dev->dev_addr, device->mac, ETH_ALEN); 465 dev->mtu = transport->user->mtu; 466 dev->netdev_ops = ¨_netdev_ops; 467 dev->ethtool_ops = ¨_net_ethtool_ops; 468 dev->watchdog_timeo = (HZ >> 1); 469 dev->irq = UM_ETH_IRQ; 470 471 err = update_drop_skb(lp->max_packet); 472 if (err) 473 goto out_undo_user_init; 474 475 rtnl_lock(); 476 err = register_netdevice(dev); 477 rtnl_unlock(); 478 if (err) 479 goto out_undo_user_init; 480 481 spin_lock(&devices_lock); 482 list_add(&device->list, &devices); 483 spin_unlock(&devices_lock); 484 485 return; 486 487out_undo_user_init: 488 if (transport->user->remove != NULL) 489 (*transport->user->remove)(&lp->user); 490out_unregister: 491 platform_device_unregister(&device->pdev); 492 return; /* platform_device_unregister frees dev and device */ 493out_free_netdev: 494 free_netdev(dev); 495out_free_device: 496 kfree(device); 497} 498 499static struct uml_net *find_device(int n) 500{ 501 struct uml_net *device; 502 struct list_head *ele; 503 504 spin_lock(&devices_lock); 505 list_for_each(ele, &devices) { 506 device = list_entry(ele, struct uml_net, list); 507 if (device->index == n) 508 goto out; 509 } 510 device = NULL; 511 out: 512 spin_unlock(&devices_lock); 513 return device; 514} 515 516static int eth_parse(char *str, int *index_out, char **str_out, 517 char **error_out) 518{ 519 char *end; 520 int n, err = -EINVAL; 521 522 n = simple_strtoul(str, &end, 0); 523 if (end == str) { 524 *error_out = "Bad device number"; 525 return err; 526 } 527 528 str = end; 529 if (*str != '=') { 530 *error_out = "Expected '=' after device number"; 531 return err; 532 } 533 534 str++; 535 if (find_device(n)) { 536 *error_out = "Device already configured"; 537 return err; 538 } 539 540 *index_out = n; 541 *str_out = str; 542 return 0; 543} 544 545struct eth_init { 546 struct list_head list; 547 char *init; 548 int index; 549}; 550 551static DEFINE_SPINLOCK(transports_lock); 552static LIST_HEAD(transports); 553 554/* Filled in during early boot */ 555static LIST_HEAD(eth_cmd_line); 556 557static int check_transport(struct transport *transport, char *eth, int n, 558 void **init_out, char **mac_out) 559{ 560 int len; 561 562 len = strlen(transport->name); 563 if (strncmp(eth, transport->name, len)) 564 return 0; 565 566 eth += len; 567 if (*eth == ',') 568 eth++; 569 else if (*eth != '\0') 570 return 0; 571 572 *init_out = kmalloc(transport->setup_size, GFP_KERNEL); 573 if (*init_out == NULL) 574 return 1; 575 576 if (!transport->setup(eth, mac_out, *init_out)) { 577 kfree(*init_out); 578 *init_out = NULL; 579 } 580 return 1; 581} 582 583void register_transport(struct transport *new) 584{ 585 struct list_head *ele, *next; 586 struct eth_init *eth; 587 void *init; 588 char *mac = NULL; 589 int match; 590 591 spin_lock(&transports_lock); 592 BUG_ON(!list_empty(&new->list)); 593 list_add(&new->list, &transports); 594 spin_unlock(&transports_lock); 595 596 list_for_each_safe(ele, next, ð_cmd_line) { 597 eth = list_entry(ele, struct eth_init, list); 598 match = check_transport(new, eth->init, eth->index, &init, 599 &mac); 600 if (!match) 601 continue; 602 else if (init != NULL) { 603 eth_configure(eth->index, init, mac, new); 604 kfree(init); 605 } 606 list_del(ð->list); 607 } 608} 609 610static int eth_setup_common(char *str, int index) 611{ 612 struct list_head *ele; 613 struct transport *transport; 614 void *init; 615 char *mac = NULL; 616 int found = 0; 617 618 spin_lock(&transports_lock); 619 list_for_each(ele, &transports) { 620 transport = list_entry(ele, struct transport, list); 621 if (!check_transport(transport, str, index, &init, &mac)) 622 continue; 623 if (init != NULL) { 624 eth_configure(index, init, mac, transport); 625 kfree(init); 626 } 627 found = 1; 628 break; 629 } 630 631 spin_unlock(&transports_lock); 632 return found; 633} 634 635static int __init eth_setup(char *str) 636{ 637 struct eth_init *new; 638 char *error; 639 int n, err; 640 641 err = eth_parse(str, &n, &str, &error); 642 if (err) { 643 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", 644 str, error); 645 return 1; 646 } 647 648 new = alloc_bootmem(sizeof(*new)); 649 if (new == NULL) { 650 printk(KERN_ERR "eth_init : alloc_bootmem failed\n"); 651 return 1; 652 } 653 654 INIT_LIST_HEAD(&new->list); 655 new->index = n; 656 new->init = str; 657 658 list_add_tail(&new->list, ð_cmd_line); 659 return 1; 660} 661 662__setup("eth", eth_setup); 663__uml_help(eth_setup, 664"eth[0-9]+=<transport>,<options>\n" 665" Configure a network device.\n\n" 666); 667 668static int net_config(char *str, char **error_out) 669{ 670 int n, err; 671 672 err = eth_parse(str, &n, &str, error_out); 673 if (err) 674 return err; 675 676 /* This string is broken up and the pieces used by the underlying 677 * driver. So, it is freed only if eth_setup_common fails. 678 */ 679 str = kstrdup(str, GFP_KERNEL); 680 if (str == NULL) { 681 *error_out = "net_config failed to strdup string"; 682 return -ENOMEM; 683 } 684 err = !eth_setup_common(str, n); 685 if (err) 686 kfree(str); 687 return err; 688} 689 690static int net_id(char **str, int *start_out, int *end_out) 691{ 692 char *end; 693 int n; 694 695 n = simple_strtoul(*str, &end, 0); 696 if ((*end != '\0') || (end == *str)) 697 return -1; 698 699 *start_out = n; 700 *end_out = n; 701 *str = end; 702 return n; 703} 704 705static int net_remove(int n, char **error_out) 706{ 707 struct uml_net *device; 708 struct net_device *dev; 709 struct uml_net_private *lp; 710 711 device = find_device(n); 712 if (device == NULL) 713 return -ENODEV; 714 715 dev = device->dev; 716 lp = netdev_priv(dev); 717 if (lp->fd > 0) 718 return -EBUSY; 719 unregister_netdev(dev); 720 platform_device_unregister(&device->pdev); 721 722 return 0; 723} 724 725static struct mc_device net_mc = { 726 .list = LIST_HEAD_INIT(net_mc.list), 727 .name = "eth", 728 .config = net_config, 729 .get_config = NULL, 730 .id = net_id, 731 .remove = net_remove, 732}; 733 734#ifdef CONFIG_INET 735static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, 736 void *ptr) 737{ 738 struct in_ifaddr *ifa = ptr; 739 struct net_device *dev = ifa->ifa_dev->dev; 740 struct uml_net_private *lp; 741 void (*proc)(unsigned char *, unsigned char *, void *); 742 unsigned char addr_buf[4], netmask_buf[4]; 743 744 if (dev->netdev_ops->ndo_open != uml_net_open) 745 return NOTIFY_DONE; 746 747 lp = netdev_priv(dev); 748 749 proc = NULL; 750 switch (event) { 751 case NETDEV_UP: 752 proc = lp->add_address; 753 break; 754 case NETDEV_DOWN: 755 proc = lp->delete_address; 756 break; 757 } 758 if (proc != NULL) { 759 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); 760 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); 761 (*proc)(addr_buf, netmask_buf, &lp->user); 762 } 763 return NOTIFY_DONE; 764} 765 766/* uml_net_init shouldn't be called twice on two CPUs at the same time */ 767static struct notifier_block uml_inetaddr_notifier = { 768 .notifier_call = uml_inetaddr_event, 769}; 770 771static void inet_register(void) 772{ 773 struct list_head *ele; 774 struct uml_net_private *lp; 775 struct in_device *ip; 776 struct in_ifaddr *in; 777 778 register_inetaddr_notifier(¨_inetaddr_notifier); 779 780 /* Devices may have been opened already, so the uml_inetaddr_notifier 781 * didn't get a chance to run for them. This fakes it so that 782 * addresses which have already been set up get handled properly. 783 */ 784 spin_lock(&opened_lock); 785 list_for_each(ele, &opened) { 786 lp = list_entry(ele, struct uml_net_private, list); 787 ip = lp->dev->ip_ptr; 788 if (ip == NULL) 789 continue; 790 in = ip->ifa_list; 791 while (in != NULL) { 792 uml_inetaddr_event(NULL, NETDEV_UP, in); 793 in = in->ifa_next; 794 } 795 } 796 spin_unlock(&opened_lock); 797} 798#else 799static inline void inet_register(void) 800{ 801} 802#endif 803 804static int uml_net_init(void) 805{ 806 mconsole_register_dev(&net_mc); 807 inet_register(); 808 return 0; 809} 810 811__initcall(uml_net_init); 812 813static void close_devices(void) 814{ 815 struct list_head *ele; 816 struct uml_net_private *lp; 817 818 spin_lock(&opened_lock); 819 list_for_each(ele, &opened) { 820 lp = list_entry(ele, struct uml_net_private, list); 821 free_irq(lp->dev->irq, lp->dev); 822 if ((lp->close != NULL) && (lp->fd >= 0)) 823 (*lp->close)(lp->fd, &lp->user); 824 if (lp->remove != NULL) 825 (*lp->remove)(&lp->user); 826 } 827 spin_unlock(&opened_lock); 828} 829 830__uml_exitcall(close_devices); 831 832void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 833 void *), 834 void *arg) 835{ 836 struct net_device *dev = d; 837 struct in_device *ip = dev->ip_ptr; 838 struct in_ifaddr *in; 839 unsigned char address[4], netmask[4]; 840 841 if (ip == NULL) return; 842 in = ip->ifa_list; 843 while (in != NULL) { 844 memcpy(address, &in->ifa_address, sizeof(address)); 845 memcpy(netmask, &in->ifa_mask, sizeof(netmask)); 846 (*cb)(address, netmask, arg); 847 in = in->ifa_next; 848 } 849} 850 851int dev_netmask(void *d, void *m) 852{ 853 struct net_device *dev = d; 854 struct in_device *ip = dev->ip_ptr; 855 struct in_ifaddr *in; 856 __be32 *mask_out = m; 857 858 if (ip == NULL) 859 return 1; 860 861 in = ip->ifa_list; 862 if (in == NULL) 863 return 1; 864 865 *mask_out = in->ifa_mask; 866 return 0; 867} 868 869void *get_output_buffer(int *len_out) 870{ 871 void *ret; 872 873 ret = (void *) __get_free_pages(GFP_KERNEL, 0); 874 if (ret) *len_out = PAGE_SIZE; 875 else *len_out = 0; 876 return ret; 877} 878 879void free_output_buffer(void *buffer) 880{ 881 free_pages((unsigned long) buffer, 0); 882} 883 884int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 885 char **gate_addr) 886{ 887 char *remain; 888 889 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); 890 if (remain != NULL) { 891 printk(KERN_ERR "tap_setup_common - Extra garbage on " 892 "specification : '%s'\n", remain); 893 return 1; 894 } 895 896 return 0; 897} 898 899unsigned short eth_protocol(struct sk_buff *skb) 900{ 901 return eth_type_trans(skb, skb->dev); 902} 903