1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 4 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 5 * James Leu (jleu@mindspring.net). 6 * Copyright (C) 2001 by various other people who didn't put their name here. 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, unsigned int txqueue) 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 } 270 271 static const struct ethtool_ops uml_net_ethtool_ops = { 272 .get_drvinfo = uml_net_get_drvinfo, 273 .get_link = ethtool_op_get_link, 274 .get_ts_info = ethtool_op_get_ts_info, 275 }; 276 277 void uml_net_setup_etheraddr(struct net_device *dev, char *str) 278 { 279 unsigned char *addr = dev->dev_addr; 280 char *end; 281 int i; 282 283 if (str == NULL) 284 goto random; 285 286 for (i = 0; i < 6; i++) { 287 addr[i] = simple_strtoul(str, &end, 16); 288 if ((end == str) || 289 ((*end != ':') && (*end != ',') && (*end != '\0'))) { 290 printk(KERN_ERR 291 "setup_etheraddr: failed to parse '%s' " 292 "as an ethernet address\n", str); 293 goto random; 294 } 295 str = end + 1; 296 } 297 if (is_multicast_ether_addr(addr)) { 298 printk(KERN_ERR 299 "Attempt to assign a multicast ethernet address to a " 300 "device disallowed\n"); 301 goto random; 302 } 303 if (!is_valid_ether_addr(addr)) { 304 printk(KERN_ERR 305 "Attempt to assign an invalid ethernet address to a " 306 "device disallowed\n"); 307 goto random; 308 } 309 if (!is_local_ether_addr(addr)) { 310 printk(KERN_WARNING 311 "Warning: Assigning a globally valid ethernet " 312 "address to a device\n"); 313 printk(KERN_WARNING "You should set the 2nd rightmost bit in " 314 "the first byte of the MAC,\n"); 315 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", 316 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], 317 addr[5]); 318 } 319 return; 320 321 random: 322 printk(KERN_INFO 323 "Choosing a random ethernet address for device %s\n", dev->name); 324 eth_hw_addr_random(dev); 325 } 326 327 static DEFINE_SPINLOCK(devices_lock); 328 static LIST_HEAD(devices); 329 330 static struct platform_driver uml_net_driver = { 331 .driver = { 332 .name = DRIVER_NAME, 333 }, 334 }; 335 336 static void net_device_release(struct device *dev) 337 { 338 struct uml_net *device = dev_get_drvdata(dev); 339 struct net_device *netdev = device->dev; 340 struct uml_net_private *lp = netdev_priv(netdev); 341 342 if (lp->remove != NULL) 343 (*lp->remove)(&lp->user); 344 list_del(&device->list); 345 kfree(device); 346 free_netdev(netdev); 347 } 348 349 static const struct net_device_ops uml_netdev_ops = { 350 .ndo_open = uml_net_open, 351 .ndo_stop = uml_net_close, 352 .ndo_start_xmit = uml_net_start_xmit, 353 .ndo_set_rx_mode = uml_net_set_multicast_list, 354 .ndo_tx_timeout = uml_net_tx_timeout, 355 .ndo_set_mac_address = eth_mac_addr, 356 .ndo_validate_addr = eth_validate_addr, 357 #ifdef CONFIG_NET_POLL_CONTROLLER 358 .ndo_poll_controller = uml_net_poll_controller, 359 #endif 360 }; 361 362 /* 363 * Ensures that platform_driver_register is called only once by 364 * eth_configure. Will be set in an initcall. 365 */ 366 static int driver_registered; 367 368 static void eth_configure(int n, void *init, char *mac, 369 struct transport *transport, gfp_t gfp_mask) 370 { 371 struct uml_net *device; 372 struct net_device *dev; 373 struct uml_net_private *lp; 374 int err, size; 375 376 size = transport->private_size + sizeof(struct uml_net_private); 377 378 device = kzalloc(sizeof(*device), gfp_mask); 379 if (device == NULL) { 380 printk(KERN_ERR "eth_configure failed to allocate struct " 381 "uml_net\n"); 382 return; 383 } 384 385 dev = alloc_etherdev(size); 386 if (dev == NULL) { 387 printk(KERN_ERR "eth_configure: failed to allocate struct " 388 "net_device for eth%d\n", n); 389 goto out_free_device; 390 } 391 392 INIT_LIST_HEAD(&device->list); 393 device->index = n; 394 395 /* If this name ends up conflicting with an existing registered 396 * netdevice, that is OK, register_netdev{,ice}() will notice this 397 * and fail. 398 */ 399 snprintf(dev->name, sizeof(dev->name), "eth%d", n); 400 401 uml_net_setup_etheraddr(dev, mac); 402 403 printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr); 404 405 lp = netdev_priv(dev); 406 /* This points to the transport private data. It's still clear, but we 407 * must memset it to 0 *now*. Let's help the drivers. */ 408 memset(lp, 0, size); 409 INIT_WORK(&lp->work, uml_dev_close); 410 411 /* sysfs register */ 412 if (!driver_registered) { 413 platform_driver_register(¨_net_driver); 414 driver_registered = 1; 415 } 416 device->pdev.id = n; 417 device->pdev.name = DRIVER_NAME; 418 device->pdev.dev.release = net_device_release; 419 dev_set_drvdata(&device->pdev.dev, device); 420 if (platform_device_register(&device->pdev)) 421 goto out_free_netdev; 422 SET_NETDEV_DEV(dev,&device->pdev.dev); 423 424 device->dev = dev; 425 426 /* 427 * These just fill in a data structure, so there's no failure 428 * to be worried about. 429 */ 430 (*transport->kern->init)(dev, init); 431 432 *lp = ((struct uml_net_private) 433 { .list = LIST_HEAD_INIT(lp->list), 434 .dev = dev, 435 .fd = -1, 436 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, 437 .max_packet = transport->user->max_packet, 438 .protocol = transport->kern->protocol, 439 .open = transport->user->open, 440 .close = transport->user->close, 441 .remove = transport->user->remove, 442 .read = transport->kern->read, 443 .write = transport->kern->write, 444 .add_address = transport->user->add_address, 445 .delete_address = transport->user->delete_address }); 446 447 spin_lock_init(&lp->lock); 448 memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac)); 449 450 if ((transport->user->init != NULL) && 451 ((*transport->user->init)(&lp->user, dev) != 0)) 452 goto out_unregister; 453 454 dev->mtu = transport->user->mtu; 455 dev->netdev_ops = ¨_netdev_ops; 456 dev->ethtool_ops = ¨_net_ethtool_ops; 457 dev->watchdog_timeo = (HZ >> 1); 458 dev->irq = UM_ETH_IRQ; 459 460 err = update_drop_skb(lp->max_packet); 461 if (err) 462 goto out_undo_user_init; 463 464 rtnl_lock(); 465 err = register_netdevice(dev); 466 rtnl_unlock(); 467 if (err) 468 goto out_undo_user_init; 469 470 spin_lock(&devices_lock); 471 list_add(&device->list, &devices); 472 spin_unlock(&devices_lock); 473 474 return; 475 476 out_undo_user_init: 477 if (transport->user->remove != NULL) 478 (*transport->user->remove)(&lp->user); 479 out_unregister: 480 platform_device_unregister(&device->pdev); 481 return; /* platform_device_unregister frees dev and device */ 482 out_free_netdev: 483 free_netdev(dev); 484 out_free_device: 485 kfree(device); 486 } 487 488 static struct uml_net *find_device(int n) 489 { 490 struct uml_net *device; 491 struct list_head *ele; 492 493 spin_lock(&devices_lock); 494 list_for_each(ele, &devices) { 495 device = list_entry(ele, struct uml_net, list); 496 if (device->index == n) 497 goto out; 498 } 499 device = NULL; 500 out: 501 spin_unlock(&devices_lock); 502 return device; 503 } 504 505 static int eth_parse(char *str, int *index_out, char **str_out, 506 char **error_out) 507 { 508 char *end; 509 int n, err = -EINVAL; 510 511 n = simple_strtoul(str, &end, 0); 512 if (end == str) { 513 *error_out = "Bad device number"; 514 return err; 515 } 516 517 str = end; 518 if (*str != '=') { 519 *error_out = "Expected '=' after device number"; 520 return err; 521 } 522 523 str++; 524 if (find_device(n)) { 525 *error_out = "Device already configured"; 526 return err; 527 } 528 529 *index_out = n; 530 *str_out = str; 531 return 0; 532 } 533 534 struct eth_init { 535 struct list_head list; 536 char *init; 537 int index; 538 }; 539 540 static DEFINE_SPINLOCK(transports_lock); 541 static LIST_HEAD(transports); 542 543 /* Filled in during early boot */ 544 static LIST_HEAD(eth_cmd_line); 545 546 static int check_transport(struct transport *transport, char *eth, int n, 547 void **init_out, char **mac_out, gfp_t gfp_mask) 548 { 549 int len; 550 551 len = strlen(transport->name); 552 if (strncmp(eth, transport->name, len)) 553 return 0; 554 555 eth += len; 556 if (*eth == ',') 557 eth++; 558 else if (*eth != '\0') 559 return 0; 560 561 *init_out = kmalloc(transport->setup_size, gfp_mask); 562 if (*init_out == NULL) 563 return 1; 564 565 if (!transport->setup(eth, mac_out, *init_out)) { 566 kfree(*init_out); 567 *init_out = NULL; 568 } 569 return 1; 570 } 571 572 void register_transport(struct transport *new) 573 { 574 struct list_head *ele, *next; 575 struct eth_init *eth; 576 void *init; 577 char *mac = NULL; 578 int match; 579 580 spin_lock(&transports_lock); 581 BUG_ON(!list_empty(&new->list)); 582 list_add(&new->list, &transports); 583 spin_unlock(&transports_lock); 584 585 list_for_each_safe(ele, next, ð_cmd_line) { 586 eth = list_entry(ele, struct eth_init, list); 587 match = check_transport(new, eth->init, eth->index, &init, 588 &mac, GFP_KERNEL); 589 if (!match) 590 continue; 591 else if (init != NULL) { 592 eth_configure(eth->index, init, mac, new, GFP_KERNEL); 593 kfree(init); 594 } 595 list_del(ð->list); 596 } 597 } 598 599 static int eth_setup_common(char *str, int index) 600 { 601 struct list_head *ele; 602 struct transport *transport; 603 void *init; 604 char *mac = NULL; 605 int found = 0; 606 607 spin_lock(&transports_lock); 608 list_for_each(ele, &transports) { 609 transport = list_entry(ele, struct transport, list); 610 if (!check_transport(transport, str, index, &init, 611 &mac, GFP_ATOMIC)) 612 continue; 613 if (init != NULL) { 614 eth_configure(index, init, mac, transport, GFP_ATOMIC); 615 kfree(init); 616 } 617 found = 1; 618 break; 619 } 620 621 spin_unlock(&transports_lock); 622 return found; 623 } 624 625 static int __init eth_setup(char *str) 626 { 627 struct eth_init *new; 628 char *error; 629 int n, err; 630 631 err = eth_parse(str, &n, &str, &error); 632 if (err) { 633 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", 634 str, error); 635 return 1; 636 } 637 638 new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES); 639 if (!new) 640 panic("%s: Failed to allocate %zu bytes\n", __func__, 641 sizeof(*new)); 642 643 INIT_LIST_HEAD(&new->list); 644 new->index = n; 645 new->init = str; 646 647 list_add_tail(&new->list, ð_cmd_line); 648 return 1; 649 } 650 651 __setup("eth", eth_setup); 652 __uml_help(eth_setup, 653 "eth[0-9]+=<transport>,<options>\n" 654 " Configure a network device.\n\n" 655 ); 656 657 static int net_config(char *str, char **error_out) 658 { 659 int n, err; 660 661 err = eth_parse(str, &n, &str, error_out); 662 if (err) 663 return err; 664 665 /* This string is broken up and the pieces used by the underlying 666 * driver. So, it is freed only if eth_setup_common fails. 667 */ 668 str = kstrdup(str, GFP_KERNEL); 669 if (str == NULL) { 670 *error_out = "net_config failed to strdup string"; 671 return -ENOMEM; 672 } 673 err = !eth_setup_common(str, n); 674 if (err) 675 kfree(str); 676 return err; 677 } 678 679 static int net_id(char **str, int *start_out, int *end_out) 680 { 681 char *end; 682 int n; 683 684 n = simple_strtoul(*str, &end, 0); 685 if ((*end != '\0') || (end == *str)) 686 return -1; 687 688 *start_out = n; 689 *end_out = n; 690 *str = end; 691 return n; 692 } 693 694 static int net_remove(int n, char **error_out) 695 { 696 struct uml_net *device; 697 struct net_device *dev; 698 struct uml_net_private *lp; 699 700 device = find_device(n); 701 if (device == NULL) 702 return -ENODEV; 703 704 dev = device->dev; 705 lp = netdev_priv(dev); 706 if (lp->fd > 0) 707 return -EBUSY; 708 unregister_netdev(dev); 709 platform_device_unregister(&device->pdev); 710 711 return 0; 712 } 713 714 static struct mc_device net_mc = { 715 .list = LIST_HEAD_INIT(net_mc.list), 716 .name = "eth", 717 .config = net_config, 718 .get_config = NULL, 719 .id = net_id, 720 .remove = net_remove, 721 }; 722 723 #ifdef CONFIG_INET 724 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, 725 void *ptr) 726 { 727 struct in_ifaddr *ifa = ptr; 728 struct net_device *dev = ifa->ifa_dev->dev; 729 struct uml_net_private *lp; 730 void (*proc)(unsigned char *, unsigned char *, void *); 731 unsigned char addr_buf[4], netmask_buf[4]; 732 733 if (dev->netdev_ops->ndo_open != uml_net_open) 734 return NOTIFY_DONE; 735 736 lp = netdev_priv(dev); 737 738 proc = NULL; 739 switch (event) { 740 case NETDEV_UP: 741 proc = lp->add_address; 742 break; 743 case NETDEV_DOWN: 744 proc = lp->delete_address; 745 break; 746 } 747 if (proc != NULL) { 748 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); 749 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); 750 (*proc)(addr_buf, netmask_buf, &lp->user); 751 } 752 return NOTIFY_DONE; 753 } 754 755 /* uml_net_init shouldn't be called twice on two CPUs at the same time */ 756 static struct notifier_block uml_inetaddr_notifier = { 757 .notifier_call = uml_inetaddr_event, 758 }; 759 760 static void inet_register(void) 761 { 762 struct list_head *ele; 763 struct uml_net_private *lp; 764 struct in_device *ip; 765 struct in_ifaddr *in; 766 767 register_inetaddr_notifier(¨_inetaddr_notifier); 768 769 /* Devices may have been opened already, so the uml_inetaddr_notifier 770 * didn't get a chance to run for them. This fakes it so that 771 * addresses which have already been set up get handled properly. 772 */ 773 spin_lock(&opened_lock); 774 list_for_each(ele, &opened) { 775 lp = list_entry(ele, struct uml_net_private, list); 776 ip = lp->dev->ip_ptr; 777 if (ip == NULL) 778 continue; 779 in = ip->ifa_list; 780 while (in != NULL) { 781 uml_inetaddr_event(NULL, NETDEV_UP, in); 782 in = in->ifa_next; 783 } 784 } 785 spin_unlock(&opened_lock); 786 } 787 #else 788 static inline void inet_register(void) 789 { 790 } 791 #endif 792 793 static int uml_net_init(void) 794 { 795 mconsole_register_dev(&net_mc); 796 inet_register(); 797 return 0; 798 } 799 800 __initcall(uml_net_init); 801 802 static void close_devices(void) 803 { 804 struct list_head *ele; 805 struct uml_net_private *lp; 806 807 spin_lock(&opened_lock); 808 list_for_each(ele, &opened) { 809 lp = list_entry(ele, struct uml_net_private, list); 810 um_free_irq(lp->dev->irq, lp->dev); 811 if ((lp->close != NULL) && (lp->fd >= 0)) 812 (*lp->close)(lp->fd, &lp->user); 813 if (lp->remove != NULL) 814 (*lp->remove)(&lp->user); 815 } 816 spin_unlock(&opened_lock); 817 } 818 819 __uml_exitcall(close_devices); 820 821 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 822 void *), 823 void *arg) 824 { 825 struct net_device *dev = d; 826 struct in_device *ip = dev->ip_ptr; 827 struct in_ifaddr *in; 828 unsigned char address[4], netmask[4]; 829 830 if (ip == NULL) return; 831 in = ip->ifa_list; 832 while (in != NULL) { 833 memcpy(address, &in->ifa_address, sizeof(address)); 834 memcpy(netmask, &in->ifa_mask, sizeof(netmask)); 835 (*cb)(address, netmask, arg); 836 in = in->ifa_next; 837 } 838 } 839 840 int dev_netmask(void *d, void *m) 841 { 842 struct net_device *dev = d; 843 struct in_device *ip = dev->ip_ptr; 844 struct in_ifaddr *in; 845 __be32 *mask_out = m; 846 847 if (ip == NULL) 848 return 1; 849 850 in = ip->ifa_list; 851 if (in == NULL) 852 return 1; 853 854 *mask_out = in->ifa_mask; 855 return 0; 856 } 857 858 void *get_output_buffer(int *len_out) 859 { 860 void *ret; 861 862 ret = (void *) __get_free_pages(GFP_KERNEL, 0); 863 if (ret) *len_out = PAGE_SIZE; 864 else *len_out = 0; 865 return ret; 866 } 867 868 void free_output_buffer(void *buffer) 869 { 870 free_pages((unsigned long) buffer, 0); 871 } 872 873 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 874 char **gate_addr) 875 { 876 char *remain; 877 878 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); 879 if (remain != NULL) { 880 printk(KERN_ERR "tap_setup_common - Extra garbage on " 881 "specification : '%s'\n", remain); 882 return 1; 883 } 884 885 return 0; 886 } 887 888 unsigned short eth_protocol(struct sk_buff *skb) 889 { 890 return eth_type_trans(skb, skb->dev); 891 } 892