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 30 static DEFINE_SPINLOCK(opened_lock); 31 static 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 */ 41 static DEFINE_SPINLOCK(drop_lock); 42 static struct sk_buff *drop_skb; 43 static int drop_max; 44 45 static 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; 67 out: 68 spin_unlock_irqrestore(&drop_lock, flags); 69 70 return err; 71 } 72 73 static 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 } 107 108 static 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 } 114 115 static 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); 141 142 out: 143 spin_unlock(&lp->lock); 144 return IRQ_HANDLED; 145 } 146 147 static 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_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 netif_start_queue(dev); 172 173 /* clear buffer - it can happen that the host side of the interface 174 * is full when we get here. In this case, new data is never queued, 175 * SIGIOs never arrive, and the net never works. 176 */ 177 while ((err = uml_net_rx(dev)) > 0) ; 178 179 spin_lock(&opened_lock); 180 list_add(&lp->list, &opened); 181 spin_unlock(&opened_lock); 182 183 return 0; 184 out_close: 185 if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user); 186 lp->fd = -1; 187 out: 188 return err; 189 } 190 191 static int uml_net_close(struct net_device *dev) 192 { 193 struct uml_net_private *lp = netdev_priv(dev); 194 195 netif_stop_queue(dev); 196 197 um_free_irq(dev->irq, dev); 198 if (lp->close != NULL) 199 (*lp->close)(lp->fd, &lp->user); 200 lp->fd = -1; 201 202 spin_lock(&opened_lock); 203 list_del(&lp->list); 204 spin_unlock(&opened_lock); 205 206 return 0; 207 } 208 209 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) 210 { 211 struct uml_net_private *lp = netdev_priv(dev); 212 unsigned long flags; 213 int len; 214 215 netif_stop_queue(dev); 216 217 spin_lock_irqsave(&lp->lock, flags); 218 219 len = (*lp->write)(lp->fd, skb, lp); 220 skb_tx_timestamp(skb); 221 222 if (len == skb->len) { 223 dev->stats.tx_packets++; 224 dev->stats.tx_bytes += skb->len; 225 netif_trans_update(dev); 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_consume_skb_any(skb); 243 244 return NETDEV_TX_OK; 245 } 246 247 static void uml_net_set_multicast_list(struct net_device *dev) 248 { 249 return; 250 } 251 252 static void uml_net_tx_timeout(struct net_device *dev) 253 { 254 netif_trans_update(dev); 255 netif_wake_queue(dev); 256 } 257 258 #ifdef CONFIG_NET_POLL_CONTROLLER 259 static void uml_net_poll_controller(struct net_device *dev) 260 { 261 disable_irq(dev->irq); 262 uml_net_interrupt(dev->irq, dev); 263 enable_irq(dev->irq); 264 } 265 #endif 266 267 static void uml_net_get_drvinfo(struct net_device *dev, 268 struct ethtool_drvinfo *info) 269 { 270 strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver)); 271 strlcpy(info->version, "42", sizeof(info->version)); 272 } 273 274 static const struct ethtool_ops uml_net_ethtool_ops = { 275 .get_drvinfo = uml_net_get_drvinfo, 276 .get_link = ethtool_op_get_link, 277 .get_ts_info = ethtool_op_get_ts_info, 278 }; 279 280 static void uml_net_user_timer_expire(struct timer_list *t) 281 { 282 #ifdef undef 283 struct uml_net_private *lp = from_timer(lp, t, tl); 284 struct connection *conn = &lp->user; 285 286 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn); 287 do_connect(conn); 288 #endif 289 } 290 291 void uml_net_setup_etheraddr(struct net_device *dev, char *str) 292 { 293 unsigned char *addr = dev->dev_addr; 294 char *end; 295 int i; 296 297 if (str == NULL) 298 goto random; 299 300 for (i = 0; i < 6; i++) { 301 addr[i] = simple_strtoul(str, &end, 16); 302 if ((end == str) || 303 ((*end != ':') && (*end != ',') && (*end != '\0'))) { 304 printk(KERN_ERR 305 "setup_etheraddr: failed to parse '%s' " 306 "as an ethernet address\n", str); 307 goto random; 308 } 309 str = end + 1; 310 } 311 if (is_multicast_ether_addr(addr)) { 312 printk(KERN_ERR 313 "Attempt to assign a multicast ethernet address to a " 314 "device disallowed\n"); 315 goto random; 316 } 317 if (!is_valid_ether_addr(addr)) { 318 printk(KERN_ERR 319 "Attempt to assign an invalid ethernet address to a " 320 "device disallowed\n"); 321 goto random; 322 } 323 if (!is_local_ether_addr(addr)) { 324 printk(KERN_WARNING 325 "Warning: Assigning a globally valid ethernet " 326 "address to a device\n"); 327 printk(KERN_WARNING "You should set the 2nd rightmost bit in " 328 "the first byte of the MAC,\n"); 329 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", 330 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], 331 addr[5]); 332 } 333 return; 334 335 random: 336 printk(KERN_INFO 337 "Choosing a random ethernet address for device %s\n", dev->name); 338 eth_hw_addr_random(dev); 339 } 340 341 static DEFINE_SPINLOCK(devices_lock); 342 static LIST_HEAD(devices); 343 344 static struct platform_driver uml_net_driver = { 345 .driver = { 346 .name = DRIVER_NAME, 347 }, 348 }; 349 350 static void net_device_release(struct device *dev) 351 { 352 struct uml_net *device = dev_get_drvdata(dev); 353 struct net_device *netdev = device->dev; 354 struct uml_net_private *lp = netdev_priv(netdev); 355 356 if (lp->remove != NULL) 357 (*lp->remove)(&lp->user); 358 list_del(&device->list); 359 kfree(device); 360 free_netdev(netdev); 361 } 362 363 static const struct net_device_ops uml_netdev_ops = { 364 .ndo_open = uml_net_open, 365 .ndo_stop = uml_net_close, 366 .ndo_start_xmit = uml_net_start_xmit, 367 .ndo_set_rx_mode = uml_net_set_multicast_list, 368 .ndo_tx_timeout = uml_net_tx_timeout, 369 .ndo_set_mac_address = eth_mac_addr, 370 .ndo_validate_addr = eth_validate_addr, 371 #ifdef CONFIG_NET_POLL_CONTROLLER 372 .ndo_poll_controller = uml_net_poll_controller, 373 #endif 374 }; 375 376 /* 377 * Ensures that platform_driver_register is called only once by 378 * eth_configure. Will be set in an initcall. 379 */ 380 static int driver_registered; 381 382 static void eth_configure(int n, void *init, char *mac, 383 struct transport *transport, gfp_t gfp_mask) 384 { 385 struct uml_net *device; 386 struct net_device *dev; 387 struct uml_net_private *lp; 388 int err, size; 389 390 size = transport->private_size + sizeof(struct uml_net_private); 391 392 device = kzalloc(sizeof(*device), gfp_mask); 393 if (device == NULL) { 394 printk(KERN_ERR "eth_configure failed to allocate struct " 395 "uml_net\n"); 396 return; 397 } 398 399 dev = alloc_etherdev(size); 400 if (dev == NULL) { 401 printk(KERN_ERR "eth_configure: failed to allocate struct " 402 "net_device for eth%d\n", n); 403 goto out_free_device; 404 } 405 406 INIT_LIST_HEAD(&device->list); 407 device->index = n; 408 409 /* If this name ends up conflicting with an existing registered 410 * netdevice, that is OK, register_netdev{,ice}() will notice this 411 * and fail. 412 */ 413 snprintf(dev->name, sizeof(dev->name), "eth%d", n); 414 415 uml_net_setup_etheraddr(dev, mac); 416 417 printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr); 418 419 lp = netdev_priv(dev); 420 /* This points to the transport private data. It's still clear, but we 421 * must memset it to 0 *now*. Let's help the drivers. */ 422 memset(lp, 0, size); 423 INIT_WORK(&lp->work, uml_dev_close); 424 425 /* sysfs register */ 426 if (!driver_registered) { 427 platform_driver_register(¨_net_driver); 428 driver_registered = 1; 429 } 430 device->pdev.id = n; 431 device->pdev.name = DRIVER_NAME; 432 device->pdev.dev.release = net_device_release; 433 dev_set_drvdata(&device->pdev.dev, device); 434 if (platform_device_register(&device->pdev)) 435 goto out_free_netdev; 436 SET_NETDEV_DEV(dev,&device->pdev.dev); 437 438 device->dev = dev; 439 440 /* 441 * These just fill in a data structure, so there's no failure 442 * to be worried about. 443 */ 444 (*transport->kern->init)(dev, init); 445 446 *lp = ((struct uml_net_private) 447 { .list = LIST_HEAD_INIT(lp->list), 448 .dev = dev, 449 .fd = -1, 450 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, 451 .max_packet = transport->user->max_packet, 452 .protocol = transport->kern->protocol, 453 .open = transport->user->open, 454 .close = transport->user->close, 455 .remove = transport->user->remove, 456 .read = transport->kern->read, 457 .write = transport->kern->write, 458 .add_address = transport->user->add_address, 459 .delete_address = transport->user->delete_address }); 460 461 timer_setup(&lp->tl, uml_net_user_timer_expire, 0); 462 spin_lock_init(&lp->lock); 463 memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac)); 464 465 if ((transport->user->init != NULL) && 466 ((*transport->user->init)(&lp->user, dev) != 0)) 467 goto out_unregister; 468 469 dev->mtu = transport->user->mtu; 470 dev->netdev_ops = ¨_netdev_ops; 471 dev->ethtool_ops = ¨_net_ethtool_ops; 472 dev->watchdog_timeo = (HZ >> 1); 473 dev->irq = UM_ETH_IRQ; 474 475 err = update_drop_skb(lp->max_packet); 476 if (err) 477 goto out_undo_user_init; 478 479 rtnl_lock(); 480 err = register_netdevice(dev); 481 rtnl_unlock(); 482 if (err) 483 goto out_undo_user_init; 484 485 spin_lock(&devices_lock); 486 list_add(&device->list, &devices); 487 spin_unlock(&devices_lock); 488 489 return; 490 491 out_undo_user_init: 492 if (transport->user->remove != NULL) 493 (*transport->user->remove)(&lp->user); 494 out_unregister: 495 platform_device_unregister(&device->pdev); 496 return; /* platform_device_unregister frees dev and device */ 497 out_free_netdev: 498 free_netdev(dev); 499 out_free_device: 500 kfree(device); 501 } 502 503 static struct uml_net *find_device(int n) 504 { 505 struct uml_net *device; 506 struct list_head *ele; 507 508 spin_lock(&devices_lock); 509 list_for_each(ele, &devices) { 510 device = list_entry(ele, struct uml_net, list); 511 if (device->index == n) 512 goto out; 513 } 514 device = NULL; 515 out: 516 spin_unlock(&devices_lock); 517 return device; 518 } 519 520 static int eth_parse(char *str, int *index_out, char **str_out, 521 char **error_out) 522 { 523 char *end; 524 int n, err = -EINVAL; 525 526 n = simple_strtoul(str, &end, 0); 527 if (end == str) { 528 *error_out = "Bad device number"; 529 return err; 530 } 531 532 str = end; 533 if (*str != '=') { 534 *error_out = "Expected '=' after device number"; 535 return err; 536 } 537 538 str++; 539 if (find_device(n)) { 540 *error_out = "Device already configured"; 541 return err; 542 } 543 544 *index_out = n; 545 *str_out = str; 546 return 0; 547 } 548 549 struct eth_init { 550 struct list_head list; 551 char *init; 552 int index; 553 }; 554 555 static DEFINE_SPINLOCK(transports_lock); 556 static LIST_HEAD(transports); 557 558 /* Filled in during early boot */ 559 static LIST_HEAD(eth_cmd_line); 560 561 static int check_transport(struct transport *transport, char *eth, int n, 562 void **init_out, char **mac_out, gfp_t gfp_mask) 563 { 564 int len; 565 566 len = strlen(transport->name); 567 if (strncmp(eth, transport->name, len)) 568 return 0; 569 570 eth += len; 571 if (*eth == ',') 572 eth++; 573 else if (*eth != '\0') 574 return 0; 575 576 *init_out = kmalloc(transport->setup_size, gfp_mask); 577 if (*init_out == NULL) 578 return 1; 579 580 if (!transport->setup(eth, mac_out, *init_out)) { 581 kfree(*init_out); 582 *init_out = NULL; 583 } 584 return 1; 585 } 586 587 void register_transport(struct transport *new) 588 { 589 struct list_head *ele, *next; 590 struct eth_init *eth; 591 void *init; 592 char *mac = NULL; 593 int match; 594 595 spin_lock(&transports_lock); 596 BUG_ON(!list_empty(&new->list)); 597 list_add(&new->list, &transports); 598 spin_unlock(&transports_lock); 599 600 list_for_each_safe(ele, next, ð_cmd_line) { 601 eth = list_entry(ele, struct eth_init, list); 602 match = check_transport(new, eth->init, eth->index, &init, 603 &mac, GFP_KERNEL); 604 if (!match) 605 continue; 606 else if (init != NULL) { 607 eth_configure(eth->index, init, mac, new, GFP_KERNEL); 608 kfree(init); 609 } 610 list_del(ð->list); 611 } 612 } 613 614 static int eth_setup_common(char *str, int index) 615 { 616 struct list_head *ele; 617 struct transport *transport; 618 void *init; 619 char *mac = NULL; 620 int found = 0; 621 622 spin_lock(&transports_lock); 623 list_for_each(ele, &transports) { 624 transport = list_entry(ele, struct transport, list); 625 if (!check_transport(transport, str, index, &init, 626 &mac, GFP_ATOMIC)) 627 continue; 628 if (init != NULL) { 629 eth_configure(index, init, mac, transport, GFP_ATOMIC); 630 kfree(init); 631 } 632 found = 1; 633 break; 634 } 635 636 spin_unlock(&transports_lock); 637 return found; 638 } 639 640 static int __init eth_setup(char *str) 641 { 642 struct eth_init *new; 643 char *error; 644 int n, err; 645 646 err = eth_parse(str, &n, &str, &error); 647 if (err) { 648 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", 649 str, error); 650 return 1; 651 } 652 653 new = alloc_bootmem(sizeof(*new)); 654 655 INIT_LIST_HEAD(&new->list); 656 new->index = n; 657 new->init = str; 658 659 list_add_tail(&new->list, ð_cmd_line); 660 return 1; 661 } 662 663 __setup("eth", eth_setup); 664 __uml_help(eth_setup, 665 "eth[0-9]+=<transport>,<options>\n" 666 " Configure a network device.\n\n" 667 ); 668 669 static int net_config(char *str, char **error_out) 670 { 671 int n, err; 672 673 err = eth_parse(str, &n, &str, error_out); 674 if (err) 675 return err; 676 677 /* This string is broken up and the pieces used by the underlying 678 * driver. So, it is freed only if eth_setup_common fails. 679 */ 680 str = kstrdup(str, GFP_KERNEL); 681 if (str == NULL) { 682 *error_out = "net_config failed to strdup string"; 683 return -ENOMEM; 684 } 685 err = !eth_setup_common(str, n); 686 if (err) 687 kfree(str); 688 return err; 689 } 690 691 static int net_id(char **str, int *start_out, int *end_out) 692 { 693 char *end; 694 int n; 695 696 n = simple_strtoul(*str, &end, 0); 697 if ((*end != '\0') || (end == *str)) 698 return -1; 699 700 *start_out = n; 701 *end_out = n; 702 *str = end; 703 return n; 704 } 705 706 static int net_remove(int n, char **error_out) 707 { 708 struct uml_net *device; 709 struct net_device *dev; 710 struct uml_net_private *lp; 711 712 device = find_device(n); 713 if (device == NULL) 714 return -ENODEV; 715 716 dev = device->dev; 717 lp = netdev_priv(dev); 718 if (lp->fd > 0) 719 return -EBUSY; 720 unregister_netdev(dev); 721 platform_device_unregister(&device->pdev); 722 723 return 0; 724 } 725 726 static struct mc_device net_mc = { 727 .list = LIST_HEAD_INIT(net_mc.list), 728 .name = "eth", 729 .config = net_config, 730 .get_config = NULL, 731 .id = net_id, 732 .remove = net_remove, 733 }; 734 735 #ifdef CONFIG_INET 736 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, 737 void *ptr) 738 { 739 struct in_ifaddr *ifa = ptr; 740 struct net_device *dev = ifa->ifa_dev->dev; 741 struct uml_net_private *lp; 742 void (*proc)(unsigned char *, unsigned char *, void *); 743 unsigned char addr_buf[4], netmask_buf[4]; 744 745 if (dev->netdev_ops->ndo_open != uml_net_open) 746 return NOTIFY_DONE; 747 748 lp = netdev_priv(dev); 749 750 proc = NULL; 751 switch (event) { 752 case NETDEV_UP: 753 proc = lp->add_address; 754 break; 755 case NETDEV_DOWN: 756 proc = lp->delete_address; 757 break; 758 } 759 if (proc != NULL) { 760 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); 761 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); 762 (*proc)(addr_buf, netmask_buf, &lp->user); 763 } 764 return NOTIFY_DONE; 765 } 766 767 /* uml_net_init shouldn't be called twice on two CPUs at the same time */ 768 static struct notifier_block uml_inetaddr_notifier = { 769 .notifier_call = uml_inetaddr_event, 770 }; 771 772 static void inet_register(void) 773 { 774 struct list_head *ele; 775 struct uml_net_private *lp; 776 struct in_device *ip; 777 struct in_ifaddr *in; 778 779 register_inetaddr_notifier(¨_inetaddr_notifier); 780 781 /* Devices may have been opened already, so the uml_inetaddr_notifier 782 * didn't get a chance to run for them. This fakes it so that 783 * addresses which have already been set up get handled properly. 784 */ 785 spin_lock(&opened_lock); 786 list_for_each(ele, &opened) { 787 lp = list_entry(ele, struct uml_net_private, list); 788 ip = lp->dev->ip_ptr; 789 if (ip == NULL) 790 continue; 791 in = ip->ifa_list; 792 while (in != NULL) { 793 uml_inetaddr_event(NULL, NETDEV_UP, in); 794 in = in->ifa_next; 795 } 796 } 797 spin_unlock(&opened_lock); 798 } 799 #else 800 static inline void inet_register(void) 801 { 802 } 803 #endif 804 805 static int uml_net_init(void) 806 { 807 mconsole_register_dev(&net_mc); 808 inet_register(); 809 return 0; 810 } 811 812 __initcall(uml_net_init); 813 814 static void close_devices(void) 815 { 816 struct list_head *ele; 817 struct uml_net_private *lp; 818 819 spin_lock(&opened_lock); 820 list_for_each(ele, &opened) { 821 lp = list_entry(ele, struct uml_net_private, list); 822 um_free_irq(lp->dev->irq, lp->dev); 823 if ((lp->close != NULL) && (lp->fd >= 0)) 824 (*lp->close)(lp->fd, &lp->user); 825 if (lp->remove != NULL) 826 (*lp->remove)(&lp->user); 827 } 828 spin_unlock(&opened_lock); 829 } 830 831 __uml_exitcall(close_devices); 832 833 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 834 void *), 835 void *arg) 836 { 837 struct net_device *dev = d; 838 struct in_device *ip = dev->ip_ptr; 839 struct in_ifaddr *in; 840 unsigned char address[4], netmask[4]; 841 842 if (ip == NULL) return; 843 in = ip->ifa_list; 844 while (in != NULL) { 845 memcpy(address, &in->ifa_address, sizeof(address)); 846 memcpy(netmask, &in->ifa_mask, sizeof(netmask)); 847 (*cb)(address, netmask, arg); 848 in = in->ifa_next; 849 } 850 } 851 852 int dev_netmask(void *d, void *m) 853 { 854 struct net_device *dev = d; 855 struct in_device *ip = dev->ip_ptr; 856 struct in_ifaddr *in; 857 __be32 *mask_out = m; 858 859 if (ip == NULL) 860 return 1; 861 862 in = ip->ifa_list; 863 if (in == NULL) 864 return 1; 865 866 *mask_out = in->ifa_mask; 867 return 0; 868 } 869 870 void *get_output_buffer(int *len_out) 871 { 872 void *ret; 873 874 ret = (void *) __get_free_pages(GFP_KERNEL, 0); 875 if (ret) *len_out = PAGE_SIZE; 876 else *len_out = 0; 877 return ret; 878 } 879 880 void free_output_buffer(void *buffer) 881 { 882 free_pages((unsigned long) buffer, 0); 883 } 884 885 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 886 char **gate_addr) 887 { 888 char *remain; 889 890 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); 891 if (remain != NULL) { 892 printk(KERN_ERR "tap_setup_common - Extra garbage on " 893 "specification : '%s'\n", remain); 894 return 1; 895 } 896 897 return 0; 898 } 899 900 unsigned short eth_protocol(struct sk_buff *skb) 901 { 902 return eth_type_trans(skb, skb->dev); 903 } 904