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/memblock.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 out: 141 spin_unlock(&lp->lock); 142 return IRQ_HANDLED; 143 } 144 145 static int uml_net_open(struct net_device *dev) 146 { 147 struct uml_net_private *lp = netdev_priv(dev); 148 int err; 149 150 if (lp->fd >= 0) { 151 err = -ENXIO; 152 goto out; 153 } 154 155 lp->fd = (*lp->open)(&lp->user); 156 if (lp->fd < 0) { 157 err = lp->fd; 158 goto out; 159 } 160 161 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt, 162 IRQF_SHARED, dev->name, dev); 163 if (err != 0) { 164 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err); 165 err = -ENETUNREACH; 166 goto out_close; 167 } 168 169 netif_start_queue(dev); 170 171 /* clear buffer - it can happen that the host side of the interface 172 * is full when we get here. In this case, new data is never queued, 173 * SIGIOs never arrive, and the net never works. 174 */ 175 while ((err = uml_net_rx(dev)) > 0) ; 176 177 spin_lock(&opened_lock); 178 list_add(&lp->list, &opened); 179 spin_unlock(&opened_lock); 180 181 return 0; 182 out_close: 183 if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user); 184 lp->fd = -1; 185 out: 186 return err; 187 } 188 189 static int uml_net_close(struct net_device *dev) 190 { 191 struct uml_net_private *lp = netdev_priv(dev); 192 193 netif_stop_queue(dev); 194 195 um_free_irq(dev->irq, dev); 196 if (lp->close != NULL) 197 (*lp->close)(lp->fd, &lp->user); 198 lp->fd = -1; 199 200 spin_lock(&opened_lock); 201 list_del(&lp->list); 202 spin_unlock(&opened_lock); 203 204 return 0; 205 } 206 207 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) 208 { 209 struct uml_net_private *lp = netdev_priv(dev); 210 unsigned long flags; 211 int len; 212 213 netif_stop_queue(dev); 214 215 spin_lock_irqsave(&lp->lock, flags); 216 217 len = (*lp->write)(lp->fd, skb, lp); 218 skb_tx_timestamp(skb); 219 220 if (len == skb->len) { 221 dev->stats.tx_packets++; 222 dev->stats.tx_bytes += skb->len; 223 netif_trans_update(dev); 224 netif_start_queue(dev); 225 226 /* this is normally done in the interrupt when tx finishes */ 227 netif_wake_queue(dev); 228 } 229 else if (len == 0) { 230 netif_start_queue(dev); 231 dev->stats.tx_dropped++; 232 } 233 else { 234 netif_start_queue(dev); 235 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len); 236 } 237 238 spin_unlock_irqrestore(&lp->lock, flags); 239 240 dev_consume_skb_any(skb); 241 242 return NETDEV_TX_OK; 243 } 244 245 static void uml_net_set_multicast_list(struct net_device *dev) 246 { 247 return; 248 } 249 250 static void uml_net_tx_timeout(struct net_device *dev) 251 { 252 netif_trans_update(dev); 253 netif_wake_queue(dev); 254 } 255 256 #ifdef CONFIG_NET_POLL_CONTROLLER 257 static void uml_net_poll_controller(struct net_device *dev) 258 { 259 disable_irq(dev->irq); 260 uml_net_interrupt(dev->irq, dev); 261 enable_irq(dev->irq); 262 } 263 #endif 264 265 static void uml_net_get_drvinfo(struct net_device *dev, 266 struct ethtool_drvinfo *info) 267 { 268 strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver)); 269 strlcpy(info->version, "42", sizeof(info->version)); 270 } 271 272 static const struct ethtool_ops uml_net_ethtool_ops = { 273 .get_drvinfo = uml_net_get_drvinfo, 274 .get_link = ethtool_op_get_link, 275 .get_ts_info = ethtool_op_get_ts_info, 276 }; 277 278 static void uml_net_user_timer_expire(struct timer_list *t) 279 { 280 #ifdef undef 281 struct uml_net_private *lp = from_timer(lp, t, tl); 282 struct connection *conn = &lp->user; 283 284 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn); 285 do_connect(conn); 286 #endif 287 } 288 289 void uml_net_setup_etheraddr(struct net_device *dev, char *str) 290 { 291 unsigned char *addr = dev->dev_addr; 292 char *end; 293 int i; 294 295 if (str == NULL) 296 goto random; 297 298 for (i = 0; i < 6; i++) { 299 addr[i] = simple_strtoul(str, &end, 16); 300 if ((end == str) || 301 ((*end != ':') && (*end != ',') && (*end != '\0'))) { 302 printk(KERN_ERR 303 "setup_etheraddr: failed to parse '%s' " 304 "as an ethernet address\n", str); 305 goto random; 306 } 307 str = end + 1; 308 } 309 if (is_multicast_ether_addr(addr)) { 310 printk(KERN_ERR 311 "Attempt to assign a multicast ethernet address to a " 312 "device disallowed\n"); 313 goto random; 314 } 315 if (!is_valid_ether_addr(addr)) { 316 printk(KERN_ERR 317 "Attempt to assign an invalid ethernet address to a " 318 "device disallowed\n"); 319 goto random; 320 } 321 if (!is_local_ether_addr(addr)) { 322 printk(KERN_WARNING 323 "Warning: Assigning a globally valid ethernet " 324 "address to a device\n"); 325 printk(KERN_WARNING "You should set the 2nd rightmost bit in " 326 "the first byte of the MAC,\n"); 327 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", 328 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], 329 addr[5]); 330 } 331 return; 332 333 random: 334 printk(KERN_INFO 335 "Choosing a random ethernet address for device %s\n", dev->name); 336 eth_hw_addr_random(dev); 337 } 338 339 static DEFINE_SPINLOCK(devices_lock); 340 static LIST_HEAD(devices); 341 342 static struct platform_driver uml_net_driver = { 343 .driver = { 344 .name = DRIVER_NAME, 345 }, 346 }; 347 348 static void net_device_release(struct device *dev) 349 { 350 struct uml_net *device = dev_get_drvdata(dev); 351 struct net_device *netdev = device->dev; 352 struct uml_net_private *lp = netdev_priv(netdev); 353 354 if (lp->remove != NULL) 355 (*lp->remove)(&lp->user); 356 list_del(&device->list); 357 kfree(device); 358 free_netdev(netdev); 359 } 360 361 static const struct net_device_ops uml_netdev_ops = { 362 .ndo_open = uml_net_open, 363 .ndo_stop = uml_net_close, 364 .ndo_start_xmit = uml_net_start_xmit, 365 .ndo_set_rx_mode = uml_net_set_multicast_list, 366 .ndo_tx_timeout = uml_net_tx_timeout, 367 .ndo_set_mac_address = eth_mac_addr, 368 .ndo_validate_addr = eth_validate_addr, 369 #ifdef CONFIG_NET_POLL_CONTROLLER 370 .ndo_poll_controller = uml_net_poll_controller, 371 #endif 372 }; 373 374 /* 375 * Ensures that platform_driver_register is called only once by 376 * eth_configure. Will be set in an initcall. 377 */ 378 static int driver_registered; 379 380 static void eth_configure(int n, void *init, char *mac, 381 struct transport *transport, gfp_t gfp_mask) 382 { 383 struct uml_net *device; 384 struct net_device *dev; 385 struct uml_net_private *lp; 386 int err, size; 387 388 size = transport->private_size + sizeof(struct uml_net_private); 389 390 device = kzalloc(sizeof(*device), gfp_mask); 391 if (device == NULL) { 392 printk(KERN_ERR "eth_configure failed to allocate struct " 393 "uml_net\n"); 394 return; 395 } 396 397 dev = alloc_etherdev(size); 398 if (dev == NULL) { 399 printk(KERN_ERR "eth_configure: failed to allocate struct " 400 "net_device for eth%d\n", n); 401 goto out_free_device; 402 } 403 404 INIT_LIST_HEAD(&device->list); 405 device->index = n; 406 407 /* If this name ends up conflicting with an existing registered 408 * netdevice, that is OK, register_netdev{,ice}() will notice this 409 * and fail. 410 */ 411 snprintf(dev->name, sizeof(dev->name), "eth%d", n); 412 413 uml_net_setup_etheraddr(dev, mac); 414 415 printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr); 416 417 lp = netdev_priv(dev); 418 /* This points to the transport private data. It's still clear, but we 419 * must memset it to 0 *now*. Let's help the drivers. */ 420 memset(lp, 0, size); 421 INIT_WORK(&lp->work, uml_dev_close); 422 423 /* sysfs register */ 424 if (!driver_registered) { 425 platform_driver_register(¨_net_driver); 426 driver_registered = 1; 427 } 428 device->pdev.id = n; 429 device->pdev.name = DRIVER_NAME; 430 device->pdev.dev.release = net_device_release; 431 dev_set_drvdata(&device->pdev.dev, device); 432 if (platform_device_register(&device->pdev)) 433 goto out_free_netdev; 434 SET_NETDEV_DEV(dev,&device->pdev.dev); 435 436 device->dev = dev; 437 438 /* 439 * These just fill in a data structure, so there's no failure 440 * to be worried about. 441 */ 442 (*transport->kern->init)(dev, init); 443 444 *lp = ((struct uml_net_private) 445 { .list = LIST_HEAD_INIT(lp->list), 446 .dev = dev, 447 .fd = -1, 448 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, 449 .max_packet = transport->user->max_packet, 450 .protocol = transport->kern->protocol, 451 .open = transport->user->open, 452 .close = transport->user->close, 453 .remove = transport->user->remove, 454 .read = transport->kern->read, 455 .write = transport->kern->write, 456 .add_address = transport->user->add_address, 457 .delete_address = transport->user->delete_address }); 458 459 timer_setup(&lp->tl, uml_net_user_timer_expire, 0); 460 spin_lock_init(&lp->lock); 461 memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac)); 462 463 if ((transport->user->init != NULL) && 464 ((*transport->user->init)(&lp->user, dev) != 0)) 465 goto out_unregister; 466 467 dev->mtu = transport->user->mtu; 468 dev->netdev_ops = ¨_netdev_ops; 469 dev->ethtool_ops = ¨_net_ethtool_ops; 470 dev->watchdog_timeo = (HZ >> 1); 471 dev->irq = UM_ETH_IRQ; 472 473 err = update_drop_skb(lp->max_packet); 474 if (err) 475 goto out_undo_user_init; 476 477 rtnl_lock(); 478 err = register_netdevice(dev); 479 rtnl_unlock(); 480 if (err) 481 goto out_undo_user_init; 482 483 spin_lock(&devices_lock); 484 list_add(&device->list, &devices); 485 spin_unlock(&devices_lock); 486 487 return; 488 489 out_undo_user_init: 490 if (transport->user->remove != NULL) 491 (*transport->user->remove)(&lp->user); 492 out_unregister: 493 platform_device_unregister(&device->pdev); 494 return; /* platform_device_unregister frees dev and device */ 495 out_free_netdev: 496 free_netdev(dev); 497 out_free_device: 498 kfree(device); 499 } 500 501 static struct uml_net *find_device(int n) 502 { 503 struct uml_net *device; 504 struct list_head *ele; 505 506 spin_lock(&devices_lock); 507 list_for_each(ele, &devices) { 508 device = list_entry(ele, struct uml_net, list); 509 if (device->index == n) 510 goto out; 511 } 512 device = NULL; 513 out: 514 spin_unlock(&devices_lock); 515 return device; 516 } 517 518 static int eth_parse(char *str, int *index_out, char **str_out, 519 char **error_out) 520 { 521 char *end; 522 int n, err = -EINVAL; 523 524 n = simple_strtoul(str, &end, 0); 525 if (end == str) { 526 *error_out = "Bad device number"; 527 return err; 528 } 529 530 str = end; 531 if (*str != '=') { 532 *error_out = "Expected '=' after device number"; 533 return err; 534 } 535 536 str++; 537 if (find_device(n)) { 538 *error_out = "Device already configured"; 539 return err; 540 } 541 542 *index_out = n; 543 *str_out = str; 544 return 0; 545 } 546 547 struct eth_init { 548 struct list_head list; 549 char *init; 550 int index; 551 }; 552 553 static DEFINE_SPINLOCK(transports_lock); 554 static LIST_HEAD(transports); 555 556 /* Filled in during early boot */ 557 static LIST_HEAD(eth_cmd_line); 558 559 static int check_transport(struct transport *transport, char *eth, int n, 560 void **init_out, char **mac_out, gfp_t gfp_mask) 561 { 562 int len; 563 564 len = strlen(transport->name); 565 if (strncmp(eth, transport->name, len)) 566 return 0; 567 568 eth += len; 569 if (*eth == ',') 570 eth++; 571 else if (*eth != '\0') 572 return 0; 573 574 *init_out = kmalloc(transport->setup_size, gfp_mask); 575 if (*init_out == NULL) 576 return 1; 577 578 if (!transport->setup(eth, mac_out, *init_out)) { 579 kfree(*init_out); 580 *init_out = NULL; 581 } 582 return 1; 583 } 584 585 void register_transport(struct transport *new) 586 { 587 struct list_head *ele, *next; 588 struct eth_init *eth; 589 void *init; 590 char *mac = NULL; 591 int match; 592 593 spin_lock(&transports_lock); 594 BUG_ON(!list_empty(&new->list)); 595 list_add(&new->list, &transports); 596 spin_unlock(&transports_lock); 597 598 list_for_each_safe(ele, next, ð_cmd_line) { 599 eth = list_entry(ele, struct eth_init, list); 600 match = check_transport(new, eth->init, eth->index, &init, 601 &mac, GFP_KERNEL); 602 if (!match) 603 continue; 604 else if (init != NULL) { 605 eth_configure(eth->index, init, mac, new, GFP_KERNEL); 606 kfree(init); 607 } 608 list_del(ð->list); 609 } 610 } 611 612 static int eth_setup_common(char *str, int index) 613 { 614 struct list_head *ele; 615 struct transport *transport; 616 void *init; 617 char *mac = NULL; 618 int found = 0; 619 620 spin_lock(&transports_lock); 621 list_for_each(ele, &transports) { 622 transport = list_entry(ele, struct transport, list); 623 if (!check_transport(transport, str, index, &init, 624 &mac, GFP_ATOMIC)) 625 continue; 626 if (init != NULL) { 627 eth_configure(index, init, mac, transport, GFP_ATOMIC); 628 kfree(init); 629 } 630 found = 1; 631 break; 632 } 633 634 spin_unlock(&transports_lock); 635 return found; 636 } 637 638 static int __init eth_setup(char *str) 639 { 640 struct eth_init *new; 641 char *error; 642 int n, err; 643 644 err = eth_parse(str, &n, &str, &error); 645 if (err) { 646 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", 647 str, error); 648 return 1; 649 } 650 651 new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES); 652 if (!new) 653 panic("%s: Failed to allocate %zu bytes\n", __func__, 654 sizeof(*new)); 655 656 INIT_LIST_HEAD(&new->list); 657 new->index = n; 658 new->init = str; 659 660 list_add_tail(&new->list, ð_cmd_line); 661 return 1; 662 } 663 664 __setup("eth", eth_setup); 665 __uml_help(eth_setup, 666 "eth[0-9]+=<transport>,<options>\n" 667 " Configure a network device.\n\n" 668 ); 669 670 static int net_config(char *str, char **error_out) 671 { 672 int n, err; 673 674 err = eth_parse(str, &n, &str, error_out); 675 if (err) 676 return err; 677 678 /* This string is broken up and the pieces used by the underlying 679 * driver. So, it is freed only if eth_setup_common fails. 680 */ 681 str = kstrdup(str, GFP_KERNEL); 682 if (str == NULL) { 683 *error_out = "net_config failed to strdup string"; 684 return -ENOMEM; 685 } 686 err = !eth_setup_common(str, n); 687 if (err) 688 kfree(str); 689 return err; 690 } 691 692 static int net_id(char **str, int *start_out, int *end_out) 693 { 694 char *end; 695 int n; 696 697 n = simple_strtoul(*str, &end, 0); 698 if ((*end != '\0') || (end == *str)) 699 return -1; 700 701 *start_out = n; 702 *end_out = n; 703 *str = end; 704 return n; 705 } 706 707 static int net_remove(int n, char **error_out) 708 { 709 struct uml_net *device; 710 struct net_device *dev; 711 struct uml_net_private *lp; 712 713 device = find_device(n); 714 if (device == NULL) 715 return -ENODEV; 716 717 dev = device->dev; 718 lp = netdev_priv(dev); 719 if (lp->fd > 0) 720 return -EBUSY; 721 unregister_netdev(dev); 722 platform_device_unregister(&device->pdev); 723 724 return 0; 725 } 726 727 static struct mc_device net_mc = { 728 .list = LIST_HEAD_INIT(net_mc.list), 729 .name = "eth", 730 .config = net_config, 731 .get_config = NULL, 732 .id = net_id, 733 .remove = net_remove, 734 }; 735 736 #ifdef CONFIG_INET 737 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, 738 void *ptr) 739 { 740 struct in_ifaddr *ifa = ptr; 741 struct net_device *dev = ifa->ifa_dev->dev; 742 struct uml_net_private *lp; 743 void (*proc)(unsigned char *, unsigned char *, void *); 744 unsigned char addr_buf[4], netmask_buf[4]; 745 746 if (dev->netdev_ops->ndo_open != uml_net_open) 747 return NOTIFY_DONE; 748 749 lp = netdev_priv(dev); 750 751 proc = NULL; 752 switch (event) { 753 case NETDEV_UP: 754 proc = lp->add_address; 755 break; 756 case NETDEV_DOWN: 757 proc = lp->delete_address; 758 break; 759 } 760 if (proc != NULL) { 761 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); 762 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); 763 (*proc)(addr_buf, netmask_buf, &lp->user); 764 } 765 return NOTIFY_DONE; 766 } 767 768 /* uml_net_init shouldn't be called twice on two CPUs at the same time */ 769 static struct notifier_block uml_inetaddr_notifier = { 770 .notifier_call = uml_inetaddr_event, 771 }; 772 773 static void inet_register(void) 774 { 775 struct list_head *ele; 776 struct uml_net_private *lp; 777 struct in_device *ip; 778 struct in_ifaddr *in; 779 780 register_inetaddr_notifier(¨_inetaddr_notifier); 781 782 /* Devices may have been opened already, so the uml_inetaddr_notifier 783 * didn't get a chance to run for them. This fakes it so that 784 * addresses which have already been set up get handled properly. 785 */ 786 spin_lock(&opened_lock); 787 list_for_each(ele, &opened) { 788 lp = list_entry(ele, struct uml_net_private, list); 789 ip = lp->dev->ip_ptr; 790 if (ip == NULL) 791 continue; 792 in = ip->ifa_list; 793 while (in != NULL) { 794 uml_inetaddr_event(NULL, NETDEV_UP, in); 795 in = in->ifa_next; 796 } 797 } 798 spin_unlock(&opened_lock); 799 } 800 #else 801 static inline void inet_register(void) 802 { 803 } 804 #endif 805 806 static int uml_net_init(void) 807 { 808 mconsole_register_dev(&net_mc); 809 inet_register(); 810 return 0; 811 } 812 813 __initcall(uml_net_init); 814 815 static void close_devices(void) 816 { 817 struct list_head *ele; 818 struct uml_net_private *lp; 819 820 spin_lock(&opened_lock); 821 list_for_each(ele, &opened) { 822 lp = list_entry(ele, struct uml_net_private, list); 823 um_free_irq(lp->dev->irq, lp->dev); 824 if ((lp->close != NULL) && (lp->fd >= 0)) 825 (*lp->close)(lp->fd, &lp->user); 826 if (lp->remove != NULL) 827 (*lp->remove)(&lp->user); 828 } 829 spin_unlock(&opened_lock); 830 } 831 832 __uml_exitcall(close_devices); 833 834 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 835 void *), 836 void *arg) 837 { 838 struct net_device *dev = d; 839 struct in_device *ip = dev->ip_ptr; 840 struct in_ifaddr *in; 841 unsigned char address[4], netmask[4]; 842 843 if (ip == NULL) return; 844 in = ip->ifa_list; 845 while (in != NULL) { 846 memcpy(address, &in->ifa_address, sizeof(address)); 847 memcpy(netmask, &in->ifa_mask, sizeof(netmask)); 848 (*cb)(address, netmask, arg); 849 in = in->ifa_next; 850 } 851 } 852 853 int dev_netmask(void *d, void *m) 854 { 855 struct net_device *dev = d; 856 struct in_device *ip = dev->ip_ptr; 857 struct in_ifaddr *in; 858 __be32 *mask_out = m; 859 860 if (ip == NULL) 861 return 1; 862 863 in = ip->ifa_list; 864 if (in == NULL) 865 return 1; 866 867 *mask_out = in->ifa_mask; 868 return 0; 869 } 870 871 void *get_output_buffer(int *len_out) 872 { 873 void *ret; 874 875 ret = (void *) __get_free_pages(GFP_KERNEL, 0); 876 if (ret) *len_out = PAGE_SIZE; 877 else *len_out = 0; 878 return ret; 879 } 880 881 void free_output_buffer(void *buffer) 882 { 883 free_pages((unsigned long) buffer, 0); 884 } 885 886 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 887 char **gate_addr) 888 { 889 char *remain; 890 891 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); 892 if (remain != NULL) { 893 printk(KERN_ERR "tap_setup_common - Extra garbage on " 894 "specification : '%s'\n", remain); 895 return 1; 896 } 897 898 return 0; 899 } 900 901 unsigned short eth_protocol(struct sk_buff *skb) 902 { 903 return eth_type_trans(skb, skb->dev); 904 } 905