linux/net/core/dev.c
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   1/*
   2 *      NET3    Protocol independent device support routines.
   3 *
   4 *              This program is free software; you can redistribute it and/or
   5 *              modify it under the terms of the GNU General Public License
   6 *              as published by the Free Software Foundation; either version
   7 *              2 of the License, or (at your option) any later version.
   8 *
   9 *      Derived from the non IP parts of dev.c 1.0.19
  10 *              Authors:        Ross Biro
  11 *                              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12 *                              Mark Evans, <evansmp@uhura.aston.ac.uk>
  13 *
  14 *      Additional Authors:
  15 *              Florian la Roche <rzsfl@rz.uni-sb.de>
  16 *              Alan Cox <gw4pts@gw4pts.ampr.org>
  17 *              David Hinds <dahinds@users.sourceforge.net>
  18 *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  19 *              Adam Sulmicki <adam@cfar.umd.edu>
  20 *              Pekka Riikonen <priikone@poesidon.pspt.fi>
  21 *
  22 *      Changes:
  23 *              D.J. Barrow     :       Fixed bug where dev->refcnt gets set
  24 *                                      to 2 if register_netdev gets called
  25 *                                      before net_dev_init & also removed a
  26 *                                      few lines of code in the process.
  27 *              Alan Cox        :       device private ioctl copies fields back.
  28 *              Alan Cox        :       Transmit queue code does relevant
  29 *                                      stunts to keep the queue safe.
  30 *              Alan Cox        :       Fixed double lock.
  31 *              Alan Cox        :       Fixed promisc NULL pointer trap
  32 *              ????????        :       Support the full private ioctl range
  33 *              Alan Cox        :       Moved ioctl permission check into
  34 *                                      drivers
  35 *              Tim Kordas      :       SIOCADDMULTI/SIOCDELMULTI
  36 *              Alan Cox        :       100 backlog just doesn't cut it when
  37 *                                      you start doing multicast video 8)
  38 *              Alan Cox        :       Rewrote net_bh and list manager.
  39 *              Alan Cox        :       Fix ETH_P_ALL echoback lengths.
  40 *              Alan Cox        :       Took out transmit every packet pass
  41 *                                      Saved a few bytes in the ioctl handler
  42 *              Alan Cox        :       Network driver sets packet type before
  43 *                                      calling netif_rx. Saves a function
  44 *                                      call a packet.
  45 *              Alan Cox        :       Hashed net_bh()
  46 *              Richard Kooijman:       Timestamp fixes.
  47 *              Alan Cox        :       Wrong field in SIOCGIFDSTADDR
  48 *              Alan Cox        :       Device lock protection.
  49 *              Alan Cox        :       Fixed nasty side effect of device close
  50 *                                      changes.
  51 *              Rudi Cilibrasi  :       Pass the right thing to
  52 *                                      set_mac_address()
  53 *              Dave Miller     :       32bit quantity for the device lock to
  54 *                                      make it work out on a Sparc.
  55 *              Bjorn Ekwall    :       Added KERNELD hack.
  56 *              Alan Cox        :       Cleaned up the backlog initialise.
  57 *              Craig Metz      :       SIOCGIFCONF fix if space for under
  58 *                                      1 device.
  59 *          Thomas Bogendoerfer :       Return ENODEV for dev_open, if there
  60 *                                      is no device open function.
  61 *              Andi Kleen      :       Fix error reporting for SIOCGIFCONF
  62 *          Michael Chastain    :       Fix signed/unsigned for SIOCGIFCONF
  63 *              Cyrus Durgin    :       Cleaned for KMOD
  64 *              Adam Sulmicki   :       Bug Fix : Network Device Unload
  65 *                                      A network device unload needs to purge
  66 *                                      the backlog queue.
  67 *      Paul Rusty Russell      :       SIOCSIFNAME
  68 *              Pekka Riikonen  :       Netdev boot-time settings code
  69 *              Andrew Morton   :       Make unregister_netdevice wait
  70 *                                      indefinitely on dev->refcnt
  71 *              J Hadi Salim    :       - Backlog queue sampling
  72 *                                      - netif_rx() feedback
  73 */
  74
  75#include <asm/uaccess.h>
  76#include <asm/system.h>
  77#include <linux/bitops.h>
  78#include <linux/capability.h>
  79#include <linux/cpu.h>
  80#include <linux/types.h>
  81#include <linux/kernel.h>
  82#include <linux/sched.h>
  83#include <linux/mutex.h>
  84#include <linux/string.h>
  85#include <linux/mm.h>
  86#include <linux/socket.h>
  87#include <linux/sockios.h>
  88#include <linux/errno.h>
  89#include <linux/interrupt.h>
  90#include <linux/if_ether.h>
  91#include <linux/netdevice.h>
  92#include <linux/etherdevice.h>
  93#include <linux/notifier.h>
  94#include <linux/skbuff.h>
  95#include <net/sock.h>
  96#include <linux/rtnetlink.h>
  97#include <linux/proc_fs.h>
  98#include <linux/seq_file.h>
  99#include <linux/stat.h>
 100#include <linux/if_bridge.h>
 101#include <net/dst.h>
 102#include <net/pkt_sched.h>
 103#include <net/checksum.h>
 104#include <linux/highmem.h>
 105#include <linux/init.h>
 106#include <linux/kmod.h>
 107#include <linux/module.h>
 108#include <linux/kallsyms.h>
 109#include <linux/netpoll.h>
 110#include <linux/rcupdate.h>
 111#include <linux/delay.h>
 112#include <linux/wireless.h>
 113#include <net/iw_handler.h>
 114#include <asm/current.h>
 115#include <linux/audit.h>
 116#include <linux/dmaengine.h>
 117#include <linux/err.h>
 118#include <linux/ctype.h>
 119
 120/*
 121 *      The list of packet types we will receive (as opposed to discard)
 122 *      and the routines to invoke.
 123 *
 124 *      Why 16. Because with 16 the only overlap we get on a hash of the
 125 *      low nibble of the protocol value is RARP/SNAP/X.25.
 126 *
 127 *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
 128 *             sure which should go first, but I bet it won't make much
 129 *             difference if we are running VLANs.  The good news is that
 130 *             this protocol won't be in the list unless compiled in, so
 131 *             the average user (w/out VLANs) will not be adversely affected.
 132 *             --BLG
 133 *
 134 *              0800    IP
 135 *              8100    802.1Q VLAN
 136 *              0001    802.3
 137 *              0002    AX.25
 138 *              0004    802.2
 139 *              8035    RARP
 140 *              0005    SNAP
 141 *              0805    X.25
 142 *              0806    ARP
 143 *              8137    IPX
 144 *              0009    Localtalk
 145 *              86DD    IPv6
 146 */
 147
 148static DEFINE_SPINLOCK(ptype_lock);
 149static struct list_head ptype_base[16]; /* 16 way hashed list */
 150static struct list_head ptype_all;              /* Taps */
 151
 152#ifdef CONFIG_NET_DMA
 153static struct dma_client *net_dma_client;
 154static unsigned int net_dma_count;
 155static spinlock_t net_dma_event_lock;
 156#endif
 157
 158/*
 159 * The @dev_base list is protected by @dev_base_lock and the rtnl
 160 * semaphore.
 161 *
 162 * Pure readers hold dev_base_lock for reading.
 163 *
 164 * Writers must hold the rtnl semaphore while they loop through the
 165 * dev_base list, and hold dev_base_lock for writing when they do the
 166 * actual updates.  This allows pure readers to access the list even
 167 * while a writer is preparing to update it.
 168 *
 169 * To put it another way, dev_base_lock is held for writing only to
 170 * protect against pure readers; the rtnl semaphore provides the
 171 * protection against other writers.
 172 *
 173 * See, for example usages, register_netdevice() and
 174 * unregister_netdevice(), which must be called with the rtnl
 175 * semaphore held.
 176 */
 177struct net_device *dev_base;
 178static struct net_device **dev_tail = &dev_base;
 179DEFINE_RWLOCK(dev_base_lock);
 180
 181EXPORT_SYMBOL(dev_base);
 182EXPORT_SYMBOL(dev_base_lock);
 183
 184#define NETDEV_HASHBITS 8
 185static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
 186static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
 187
 188static inline struct hlist_head *dev_name_hash(const char *name)
 189{
 190        unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
 191        return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
 192}
 193
 194static inline struct hlist_head *dev_index_hash(int ifindex)
 195{
 196        return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
 197}
 198
 199/*
 200 *      Our notifier list
 201 */
 202
 203static RAW_NOTIFIER_HEAD(netdev_chain);
 204
 205/*
 206 *      Device drivers call our routines to queue packets here. We empty the
 207 *      queue in the local softnet handler.
 208 */
 209DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL };
 210
 211#ifdef CONFIG_SYSFS
 212extern int netdev_sysfs_init(void);
 213extern int netdev_register_sysfs(struct net_device *);
 214extern void netdev_unregister_sysfs(struct net_device *);
 215#else
 216#define netdev_sysfs_init()             (0)
 217#define netdev_register_sysfs(dev)      (0)
 218#define netdev_unregister_sysfs(dev)    do { } while(0)
 219#endif
 220
 221
 222/*******************************************************************************
 223
 224                Protocol management and registration routines
 225
 226*******************************************************************************/
 227
 228/*
 229 *      For efficiency
 230 */
 231
 232static int netdev_nit;
 233
 234/*
 235 *      Add a protocol ID to the list. Now that the input handler is
 236 *      smarter we can dispense with all the messy stuff that used to be
 237 *      here.
 238 *
 239 *      BEWARE!!! Protocol handlers, mangling input packets,
 240 *      MUST BE last in hash buckets and checking protocol handlers
 241 *      MUST start from promiscuous ptype_all chain in net_bh.
 242 *      It is true now, do not change it.
 243 *      Explanation follows: if protocol handler, mangling packet, will
 244 *      be the first on list, it is not able to sense, that packet
 245 *      is cloned and should be copied-on-write, so that it will
 246 *      change it and subsequent readers will get broken packet.
 247 *                                                      --ANK (980803)
 248 */
 249
 250/**
 251 *      dev_add_pack - add packet handler
 252 *      @pt: packet type declaration
 253 *
 254 *      Add a protocol handler to the networking stack. The passed &packet_type
 255 *      is linked into kernel lists and may not be freed until it has been
 256 *      removed from the kernel lists.
 257 *
 258 *      This call does not sleep therefore it can not 
 259 *      guarantee all CPU's that are in middle of receiving packets
 260 *      will see the new packet type (until the next received packet).
 261 */
 262
 263void dev_add_pack(struct packet_type *pt)
 264{
 265        int hash;
 266
 267        spin_lock_bh(&ptype_lock);
 268        if (pt->type == htons(ETH_P_ALL)) {
 269                netdev_nit++;
 270                list_add_rcu(&pt->list, &ptype_all);
 271        } else {
 272                hash = ntohs(pt->type) & 15;
 273                list_add_rcu(&pt->list, &ptype_base[hash]);
 274        }
 275        spin_unlock_bh(&ptype_lock);
 276}
 277
 278/**
 279 *      __dev_remove_pack        - remove packet handler
 280 *      @pt: packet type declaration
 281 *
 282 *      Remove a protocol handler that was previously added to the kernel
 283 *      protocol handlers by dev_add_pack(). The passed &packet_type is removed
 284 *      from the kernel lists and can be freed or reused once this function
 285 *      returns. 
 286 *
 287 *      The packet type might still be in use by receivers
 288 *      and must not be freed until after all the CPU's have gone
 289 *      through a quiescent state.
 290 */
 291void __dev_remove_pack(struct packet_type *pt)
 292{
 293        struct list_head *head;
 294        struct packet_type *pt1;
 295
 296        spin_lock_bh(&ptype_lock);
 297
 298        if (pt->type == htons(ETH_P_ALL)) {
 299                netdev_nit--;
 300                head = &ptype_all;
 301        } else
 302                head = &ptype_base[ntohs(pt->type) & 15];
 303
 304        list_for_each_entry(pt1, head, list) {
 305                if (pt == pt1) {
 306                        list_del_rcu(&pt->list);
 307                        goto out;
 308                }
 309        }
 310
 311        printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
 312out:
 313        spin_unlock_bh(&ptype_lock);
 314}
 315/**
 316 *      dev_remove_pack  - remove packet handler
 317 *      @pt: packet type declaration
 318 *
 319 *      Remove a protocol handler that was previously added to the kernel
 320 *      protocol handlers by dev_add_pack(). The passed &packet_type is removed
 321 *      from the kernel lists and can be freed or reused once this function
 322 *      returns.
 323 *
 324 *      This call sleeps to guarantee that no CPU is looking at the packet
 325 *      type after return.
 326 */
 327void dev_remove_pack(struct packet_type *pt)
 328{
 329        __dev_remove_pack(pt);
 330        
 331        synchronize_net();
 332}
 333
 334/******************************************************************************
 335
 336                      Device Boot-time Settings Routines
 337
 338*******************************************************************************/
 339
 340/* Boot time configuration table */
 341static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
 342
 343/**
 344 *      netdev_boot_setup_add   - add new setup entry
 345 *      @name: name of the device
 346 *      @map: configured settings for the device
 347 *
 348 *      Adds new setup entry to the dev_boot_setup list.  The function
 349 *      returns 0 on error and 1 on success.  This is a generic routine to
 350 *      all netdevices.
 351 */
 352static int netdev_boot_setup_add(char *name, struct ifmap *map)
 353{
 354        struct netdev_boot_setup *s;
 355        int i;
 356
 357        s = dev_boot_setup;
 358        for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
 359                if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
 360                        memset(s[i].name, 0, sizeof(s[i].name));
 361                        strcpy(s[i].name, name);
 362                        memcpy(&s[i].map, map, sizeof(s[i].map));
 363                        break;
 364                }
 365        }
 366
 367        return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
 368}
 369
 370/**
 371 *      netdev_boot_setup_check - check boot time settings
 372 *      @dev: the netdevice
 373 *
 374 *      Check boot time settings for the device.
 375 *      The found settings are set for the device to be used
 376 *      later in the device probing.
 377 *      Returns 0 if no settings found, 1 if they are.
 378 */
 379int netdev_boot_setup_check(struct net_device *dev)
 380{
 381        struct netdev_boot_setup *s = dev_boot_setup;
 382        int i;
 383
 384        for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
 385                if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
 386                    !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
 387                        dev->irq        = s[i].map.irq;
 388                        dev->base_addr  = s[i].map.base_addr;
 389                        dev->mem_start  = s[i].map.mem_start;
 390                        dev->mem_end    = s[i].map.mem_end;
 391                        return 1;
 392                }
 393        }
 394        return 0;
 395}
 396
 397
 398/**
 399 *      netdev_boot_base        - get address from boot time settings
 400 *      @prefix: prefix for network device
 401 *      @unit: id for network device
 402 *
 403 *      Check boot time settings for the base address of device.
 404 *      The found settings are set for the device to be used
 405 *      later in the device probing.
 406 *      Returns 0 if no settings found.
 407 */
 408unsigned long netdev_boot_base(const char *prefix, int unit)
 409{
 410        const struct netdev_boot_setup *s = dev_boot_setup;
 411        char name[IFNAMSIZ];
 412        int i;
 413
 414        sprintf(name, "%s%d", prefix, unit);
 415
 416        /*
 417         * If device already registered then return base of 1
 418         * to indicate not to probe for this interface
 419         */
 420        if (__dev_get_by_name(name))
 421                return 1;
 422
 423        for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
 424                if (!strcmp(name, s[i].name))
 425                        return s[i].map.base_addr;
 426        return 0;
 427}
 428
 429/*
 430 * Saves at boot time configured settings for any netdevice.
 431 */
 432int __init netdev_boot_setup(char *str)
 433{
 434        int ints[5];
 435        struct ifmap map;
 436
 437        str = get_options(str, ARRAY_SIZE(ints), ints);
 438        if (!str || !*str)
 439                return 0;
 440
 441        /* Save settings */
 442        memset(&map, 0, sizeof(map));
 443        if (ints[0] > 0)
 444                map.irq = ints[1];
 445        if (ints[0] > 1)
 446                map.base_addr = ints[2];
 447        if (ints[0] > 2)
 448                map.mem_start = ints[3];
 449        if (ints[0] > 3)
 450                map.mem_end = ints[4];
 451
 452        /* Add new entry to the list */
 453        return netdev_boot_setup_add(str, &map);
 454}
 455
 456__setup("netdev=", netdev_boot_setup);
 457
 458/*******************************************************************************
 459
 460                            Device Interface Subroutines
 461
 462*******************************************************************************/
 463
 464/**
 465 *      __dev_get_by_name       - find a device by its name
 466 *      @name: name to find
 467 *
 468 *      Find an interface by name. Must be called under RTNL semaphore
 469 *      or @dev_base_lock. If the name is found a pointer to the device
 470 *      is returned. If the name is not found then %NULL is returned. The
 471 *      reference counters are not incremented so the caller must be
 472 *      careful with locks.
 473 */
 474
 475struct net_device *__dev_get_by_name(const char *name)
 476{
 477        struct hlist_node *p;
 478
 479        hlist_for_each(p, dev_name_hash(name)) {
 480                struct net_device *dev
 481                        = hlist_entry(p, struct net_device, name_hlist);
 482                if (!strncmp(dev->name, name, IFNAMSIZ))
 483                        return dev;
 484        }
 485        return NULL;
 486}
 487
 488/**
 489 *      dev_get_by_name         - find a device by its name
 490 *      @name: name to find
 491 *
 492 *      Find an interface by name. This can be called from any
 493 *      context and does its own locking. The returned handle has
 494 *      the usage count incremented and the caller must use dev_put() to
 495 *      release it when it is no longer needed. %NULL is returned if no
 496 *      matching device is found.
 497 */
 498
 499struct net_device *dev_get_by_name(const char *name)
 500{
 501        struct net_device *dev;
 502
 503        read_lock(&dev_base_lock);
 504        dev = __dev_get_by_name(name);
 505        if (dev)
 506                dev_hold(dev);
 507        read_unlock(&dev_base_lock);
 508        return dev;
 509}
 510
 511/**
 512 *      __dev_get_by_index - find a device by its ifindex
 513 *      @ifindex: index of device
 514 *
 515 *      Search for an interface by index. Returns %NULL if the device
 516 *      is not found or a pointer to the device. The device has not
 517 *      had its reference counter increased so the caller must be careful
 518 *      about locking. The caller must hold either the RTNL semaphore
 519 *      or @dev_base_lock.
 520 */
 521
 522struct net_device *__dev_get_by_index(int ifindex)
 523{
 524        struct hlist_node *p;
 525
 526        hlist_for_each(p, dev_index_hash(ifindex)) {
 527                struct net_device *dev
 528                        = hlist_entry(p, struct net_device, index_hlist);
 529                if (dev->ifindex == ifindex)
 530                        return dev;
 531        }
 532        return NULL;
 533}
 534
 535
 536/**
 537 *      dev_get_by_index - find a device by its ifindex
 538 *      @ifindex: index of device
 539 *
 540 *      Search for an interface by index. Returns NULL if the device
 541 *      is not found or a pointer to the device. The device returned has
 542 *      had a reference added and the pointer is safe until the user calls
 543 *      dev_put to indicate they have finished with it.
 544 */
 545
 546struct net_device *dev_get_by_index(int ifindex)
 547{
 548        struct net_device *dev;
 549
 550        read_lock(&dev_base_lock);
 551        dev = __dev_get_by_index(ifindex);
 552        if (dev)
 553                dev_hold(dev);
 554        read_unlock(&dev_base_lock);
 555        return dev;
 556}
 557
 558/**
 559 *      dev_getbyhwaddr - find a device by its hardware address
 560 *      @type: media type of device
 561 *      @ha: hardware address
 562 *
 563 *      Search for an interface by MAC address. Returns NULL if the device
 564 *      is not found or a pointer to the device. The caller must hold the
 565 *      rtnl semaphore. The returned device has not had its ref count increased
 566 *      and the caller must therefore be careful about locking
 567 *
 568 *      BUGS:
 569 *      If the API was consistent this would be __dev_get_by_hwaddr
 570 */
 571
 572struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
 573{
 574        struct net_device *dev;
 575
 576        ASSERT_RTNL();
 577
 578        for (dev = dev_base; dev; dev = dev->next)
 579                if (dev->type == type &&
 580                    !memcmp(dev->dev_addr, ha, dev->addr_len))
 581                        break;
 582        return dev;
 583}
 584
 585EXPORT_SYMBOL(dev_getbyhwaddr);
 586
 587struct net_device *dev_getfirstbyhwtype(unsigned short type)
 588{
 589        struct net_device *dev;
 590
 591        rtnl_lock();
 592        for (dev = dev_base; dev; dev = dev->next) {
 593                if (dev->type == type) {
 594                        dev_hold(dev);
 595                        break;
 596                }
 597        }
 598        rtnl_unlock();
 599        return dev;
 600}
 601
 602EXPORT_SYMBOL(dev_getfirstbyhwtype);
 603
 604/**
 605 *      dev_get_by_flags - find any device with given flags
 606 *      @if_flags: IFF_* values
 607 *      @mask: bitmask of bits in if_flags to check
 608 *
 609 *      Search for any interface with the given flags. Returns NULL if a device
 610 *      is not found or a pointer to the device. The device returned has 
 611 *      had a reference added and the pointer is safe until the user calls
 612 *      dev_put to indicate they have finished with it.
 613 */
 614
 615struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
 616{
 617        struct net_device *dev;
 618
 619        read_lock(&dev_base_lock);
 620        for (dev = dev_base; dev != NULL; dev = dev->next) {
 621                if (((dev->flags ^ if_flags) & mask) == 0) {
 622                        dev_hold(dev);
 623                        break;
 624                }
 625        }
 626        read_unlock(&dev_base_lock);
 627        return dev;
 628}
 629
 630/**
 631 *      dev_valid_name - check if name is okay for network device
 632 *      @name: name string
 633 *
 634 *      Network device names need to be valid file names to
 635 *      to allow sysfs to work.  We also disallow any kind of
 636 *      whitespace.
 637 */
 638int dev_valid_name(const char *name)
 639{
 640        if (*name == '\0')
 641                return 0;
 642        if (strlen(name) >= IFNAMSIZ)
 643                return 0;
 644        if (!strcmp(name, ".") || !strcmp(name, ".."))
 645                return 0;
 646
 647        while (*name) {
 648                if (*name == '/' || isspace(*name))
 649                        return 0;
 650                name++;
 651        }
 652        return 1;
 653}
 654
 655/**
 656 *      dev_alloc_name - allocate a name for a device
 657 *      @dev: device
 658 *      @name: name format string
 659 *
 660 *      Passed a format string - eg "lt%d" it will try and find a suitable
 661 *      id. It scans list of devices to build up a free map, then chooses
 662 *      the first empty slot. The caller must hold the dev_base or rtnl lock
 663 *      while allocating the name and adding the device in order to avoid
 664 *      duplicates.
 665 *      Limited to bits_per_byte * page size devices (ie 32K on most platforms).
 666 *      Returns the number of the unit assigned or a negative errno code.
 667 */
 668
 669int dev_alloc_name(struct net_device *dev, const char *name)
 670{
 671        int i = 0;
 672        char buf[IFNAMSIZ];
 673        const char *p;
 674        const int max_netdevices = 8*PAGE_SIZE;
 675        long *inuse;
 676        struct net_device *d;
 677
 678        p = strnchr(name, IFNAMSIZ-1, '%');
 679        if (p) {
 680                /*
 681                 * Verify the string as this thing may have come from
 682                 * the user.  There must be either one "%d" and no other "%"
 683                 * characters.
 684                 */
 685                if (p[1] != 'd' || strchr(p + 2, '%'))
 686                        return -EINVAL;
 687
 688                /* Use one page as a bit array of possible slots */
 689                inuse = (long *) get_zeroed_page(GFP_ATOMIC);
 690                if (!inuse)
 691                        return -ENOMEM;
 692
 693                for (d = dev_base; d; d = d->next) {
 694                        if (!sscanf(d->name, name, &i))
 695                                continue;
 696                        if (i < 0 || i >= max_netdevices)
 697                                continue;
 698
 699                        /*  avoid cases where sscanf is not exact inverse of printf */
 700                        snprintf(buf, sizeof(buf), name, i);
 701                        if (!strncmp(buf, d->name, IFNAMSIZ))
 702                                set_bit(i, inuse);
 703                }
 704
 705                i = find_first_zero_bit(inuse, max_netdevices);
 706                free_page((unsigned long) inuse);
 707        }
 708
 709        snprintf(buf, sizeof(buf), name, i);
 710        if (!__dev_get_by_name(buf)) {
 711                strlcpy(dev->name, buf, IFNAMSIZ);
 712                return i;
 713        }
 714
 715        /* It is possible to run out of possible slots
 716         * when the name is long and there isn't enough space left
 717         * for the digits, or if all bits are used.
 718         */
 719        return -ENFILE;
 720}
 721
 722
 723/**
 724 *      dev_change_name - change name of a device
 725 *      @dev: device
 726 *      @newname: name (or format string) must be at least IFNAMSIZ
 727 *
 728 *      Change name of a device, can pass format strings "eth%d".
 729 *      for wildcarding.
 730 */
 731int dev_change_name(struct net_device *dev, char *newname)
 732{
 733        int err = 0;
 734
 735        ASSERT_RTNL();
 736
 737        if (dev->flags & IFF_UP)
 738                return -EBUSY;
 739
 740        if (!dev_valid_name(newname))
 741                return -EINVAL;
 742
 743        if (strchr(newname, '%')) {
 744                err = dev_alloc_name(dev, newname);
 745                if (err < 0)
 746                        return err;
 747                strcpy(newname, dev->name);
 748        }
 749        else if (__dev_get_by_name(newname))
 750                return -EEXIST;
 751        else
 752                strlcpy(dev->name, newname, IFNAMSIZ);
 753
 754        err = class_device_rename(&dev->class_dev, dev->name);
 755        if (!err) {
 756                hlist_del(&dev->name_hlist);
 757                hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
 758                raw_notifier_call_chain(&netdev_chain,
 759                                NETDEV_CHANGENAME, dev);
 760        }
 761
 762        return err;
 763}
 764
 765/**
 766 *      netdev_features_change - device changes features
 767 *      @dev: device to cause notification
 768 *
 769 *      Called to indicate a device has changed features.
 770 */
 771void netdev_features_change(struct net_device *dev)
 772{
 773        raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
 774}
 775EXPORT_SYMBOL(netdev_features_change);
 776
 777/**
 778 *      netdev_state_change - device changes state
 779 *      @dev: device to cause notification
 780 *
 781 *      Called to indicate a device has changed state. This function calls
 782 *      the notifier chains for netdev_chain and sends a NEWLINK message
 783 *      to the routing socket.
 784 */
 785void netdev_state_change(struct net_device *dev)
 786{
 787        if (dev->flags & IFF_UP) {
 788                raw_notifier_call_chain(&netdev_chain,
 789                                NETDEV_CHANGE, dev);
 790                rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 791        }
 792}
 793
 794/**
 795 *      dev_load        - load a network module
 796 *      @name: name of interface
 797 *
 798 *      If a network interface is not present and the process has suitable
 799 *      privileges this function loads the module. If module loading is not
 800 *      available in this kernel then it becomes a nop.
 801 */
 802
 803void dev_load(const char *name)
 804{
 805        struct net_device *dev;  
 806
 807        read_lock(&dev_base_lock);
 808        dev = __dev_get_by_name(name);
 809        read_unlock(&dev_base_lock);
 810
 811        if (!dev && capable(CAP_SYS_MODULE))
 812                request_module("%s", name);
 813}
 814
 815static int default_rebuild_header(struct sk_buff *skb)
 816{
 817        printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
 818               skb->dev ? skb->dev->name : "NULL!!!");
 819        kfree_skb(skb);
 820        return 1;
 821}
 822
 823
 824/**
 825 *      dev_open        - prepare an interface for use.
 826 *      @dev:   device to open
 827 *
 828 *      Takes a device from down to up state. The device's private open
 829 *      function is invoked and then the multicast lists are loaded. Finally
 830 *      the device is moved into the up state and a %NETDEV_UP message is
 831 *      sent to the netdev notifier chain.
 832 *
 833 *      Calling this function on an active interface is a nop. On a failure
 834 *      a negative errno code is returned.
 835 */
 836int dev_open(struct net_device *dev)
 837{
 838        int ret = 0;
 839
 840        /*
 841         *      Is it already up?
 842         */
 843
 844        if (dev->flags & IFF_UP)
 845                return 0;
 846
 847        /*
 848         *      Is it even present?
 849         */
 850        if (!netif_device_present(dev))
 851                return -ENODEV;
 852
 853        /*
 854         *      Call device private open method
 855         */
 856        set_bit(__LINK_STATE_START, &dev->state);
 857        if (dev->open) {
 858                ret = dev->open(dev);
 859                if (ret)
 860                        clear_bit(__LINK_STATE_START, &dev->state);
 861        }
 862
 863        /*
 864         *      If it went open OK then:
 865         */
 866
 867        if (!ret) {
 868                /*
 869                 *      Set the flags.
 870                 */
 871                dev->flags |= IFF_UP;
 872
 873                /*
 874                 *      Initialize multicasting status
 875                 */
 876                dev_mc_upload(dev);
 877
 878                /*
 879                 *      Wakeup transmit queue engine
 880                 */
 881                dev_activate(dev);
 882
 883                /*
 884                 *      ... and announce new interface.
 885                 */
 886                raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
 887        }
 888        return ret;
 889}
 890
 891/**
 892 *      dev_close - shutdown an interface.
 893 *      @dev: device to shutdown
 894 *
 895 *      This function moves an active device into down state. A
 896 *      %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
 897 *      is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
 898 *      chain.
 899 */
 900int dev_close(struct net_device *dev)
 901{
 902        if (!(dev->flags & IFF_UP))
 903                return 0;
 904
 905        /*
 906         *      Tell people we are going down, so that they can
 907         *      prepare to death, when device is still operating.
 908         */
 909        raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
 910
 911        dev_deactivate(dev);
 912
 913        clear_bit(__LINK_STATE_START, &dev->state);
 914
 915        /* Synchronize to scheduled poll. We cannot touch poll list,
 916         * it can be even on different cpu. So just clear netif_running(),
 917         * and wait when poll really will happen. Actually, the best place
 918         * for this is inside dev->stop() after device stopped its irq
 919         * engine, but this requires more changes in devices. */
 920
 921        smp_mb__after_clear_bit(); /* Commit netif_running(). */
 922        while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
 923                /* No hurry. */
 924                msleep(1);
 925        }
 926
 927        /*
 928         *      Call the device specific close. This cannot fail.
 929         *      Only if device is UP
 930         *
 931         *      We allow it to be called even after a DETACH hot-plug
 932         *      event.
 933         */
 934        if (dev->stop)
 935                dev->stop(dev);
 936
 937        /*
 938         *      Device is now down.
 939         */
 940
 941        dev->flags &= ~IFF_UP;
 942
 943        /*
 944         * Tell people we are down
 945         */
 946        raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
 947
 948        return 0;
 949}
 950
 951
 952/*
 953 *      Device change register/unregister. These are not inline or static
 954 *      as we export them to the world.
 955 */
 956
 957/**
 958 *      register_netdevice_notifier - register a network notifier block
 959 *      @nb: notifier
 960 *
 961 *      Register a notifier to be called when network device events occur.
 962 *      The notifier passed is linked into the kernel structures and must
 963 *      not be reused until it has been unregistered. A negative errno code
 964 *      is returned on a failure.
 965 *
 966 *      When registered all registration and up events are replayed
 967 *      to the new notifier to allow device to have a race free 
 968 *      view of the network device list.
 969 */
 970
 971int register_netdevice_notifier(struct notifier_block *nb)
 972{
 973        struct net_device *dev;
 974        int err;
 975
 976        rtnl_lock();
 977        err = raw_notifier_chain_register(&netdev_chain, nb);
 978        if (!err) {
 979                for (dev = dev_base; dev; dev = dev->next) {
 980                        nb->notifier_call(nb, NETDEV_REGISTER, dev);
 981
 982                        if (dev->flags & IFF_UP) 
 983                                nb->notifier_call(nb, NETDEV_UP, dev);
 984                }
 985        }
 986        rtnl_unlock();
 987        return err;
 988}
 989
 990/**
 991 *      unregister_netdevice_notifier - unregister a network notifier block
 992 *      @nb: notifier
 993 *
 994 *      Unregister a notifier previously registered by
 995 *      register_netdevice_notifier(). The notifier is unlinked into the
 996 *      kernel structures and may then be reused. A negative errno code
 997 *      is returned on a failure.
 998 */
 999
1000int unregister_netdevice_notifier(struct notifier_block *nb)
1001{
1002        int err;
1003
1004        rtnl_lock();
1005        err = raw_notifier_chain_unregister(&netdev_chain, nb);
1006        rtnl_unlock();
1007        return err;
1008}
1009
1010/**
1011 *      call_netdevice_notifiers - call all network notifier blocks
1012 *      @val: value passed unmodified to notifier function
1013 *      @v:   pointer passed unmodified to notifier function
1014 *
1015 *      Call all network notifier blocks.  Parameters and return value
1016 *      are as for raw_notifier_call_chain().
1017 */
1018
1019int call_netdevice_notifiers(unsigned long val, void *v)
1020{
1021        return raw_notifier_call_chain(&netdev_chain, val, v);
1022}
1023
1024/* When > 0 there are consumers of rx skb time stamps */
1025static atomic_t netstamp_needed = ATOMIC_INIT(0);
1026
1027void net_enable_timestamp(void)
1028{
1029        atomic_inc(&netstamp_needed);
1030}
1031
1032void net_disable_timestamp(void)
1033{
1034        atomic_dec(&netstamp_needed);
1035}
1036
1037void __net_timestamp(struct sk_buff *skb)
1038{
1039        struct timeval tv;
1040
1041        do_gettimeofday(&tv);
1042        skb_set_timestamp(skb, &tv);
1043}
1044EXPORT_SYMBOL(__net_timestamp);
1045
1046static inline void net_timestamp(struct sk_buff *skb)
1047{
1048        if (atomic_read(&netstamp_needed))
1049                __net_timestamp(skb);
1050        else {
1051                skb->tstamp.off_sec = 0;
1052                skb->tstamp.off_usec = 0;
1053        }
1054}
1055
1056/*
1057 *      Support routine. Sends outgoing frames to any network
1058 *      taps currently in use.
1059 */
1060
1061static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1062{
1063        struct packet_type *ptype;
1064
1065        net_timestamp(skb);
1066
1067        rcu_read_lock();
1068        list_for_each_entry_rcu(ptype, &ptype_all, list) {
1069                /* Never send packets back to the socket
1070                 * they originated from - MvS (miquels@drinkel.ow.org)
1071                 */
1072                if ((ptype->dev == dev || !ptype->dev) &&
1073                    (ptype->af_packet_priv == NULL ||
1074                     (struct sock *)ptype->af_packet_priv != skb->sk)) {
1075                        struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1076                        if (!skb2)
1077                                break;
1078
1079                        /* skb->nh should be correctly
1080                           set by sender, so that the second statement is
1081                           just protection against buggy protocols.
1082                         */
1083                        skb2->mac.raw = skb2->data;
1084
1085                        if (skb2->nh.raw < skb2->data ||
1086                            skb2->nh.raw > skb2->tail) {
1087                                if (net_ratelimit())
1088                                        printk(KERN_CRIT "protocol %04x is "
1089                                               "buggy, dev %s\n",
1090                                               skb2->protocol, dev->name);
1091                                skb2->nh.raw = skb2->data;
1092                        }
1093
1094                        skb2->h.raw = skb2->nh.raw;
1095                        skb2->pkt_type = PACKET_OUTGOING;
1096                        ptype->func(skb2, skb->dev, ptype, skb->dev);
1097                }
1098        }
1099        rcu_read_unlock();
1100}
1101
1102
1103void __netif_schedule(struct net_device *dev)
1104{
1105        if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1106                unsigned long flags;
1107                struct softnet_data *sd;
1108
1109                local_irq_save(flags);
1110                sd = &__get_cpu_var(softnet_data);
1111                dev->next_sched = sd->output_queue;
1112                sd->output_queue = dev;
1113                raise_softirq_irqoff(NET_TX_SOFTIRQ);
1114                local_irq_restore(flags);
1115        }
1116}
1117EXPORT_SYMBOL(__netif_schedule);
1118
1119void __netif_rx_schedule(struct net_device *dev)
1120{
1121        unsigned long flags;
1122
1123        local_irq_save(flags);
1124        dev_hold(dev);
1125        list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
1126        if (dev->quota < 0)
1127                dev->quota += dev->weight;
1128        else
1129                dev->quota = dev->weight;
1130        __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1131        local_irq_restore(flags);
1132}
1133EXPORT_SYMBOL(__netif_rx_schedule);
1134
1135void dev_kfree_skb_any(struct sk_buff *skb)
1136{
1137        if (in_irq() || irqs_disabled())
1138                dev_kfree_skb_irq(skb);
1139        else
1140                dev_kfree_skb(skb);
1141}
1142EXPORT_SYMBOL(dev_kfree_skb_any);
1143
1144
1145/* Hot-plugging. */
1146void netif_device_detach(struct net_device *dev)
1147{
1148        if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1149            netif_running(dev)) {
1150                netif_stop_queue(dev);
1151        }
1152}
1153EXPORT_SYMBOL(netif_device_detach);
1154
1155void netif_device_attach(struct net_device *dev)
1156{
1157        if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1158            netif_running(dev)) {
1159                netif_wake_queue(dev);
1160                __netdev_watchdog_up(dev);
1161        }
1162}
1163EXPORT_SYMBOL(netif_device_attach);
1164
1165
1166/*
1167 * Invalidate hardware checksum when packet is to be mangled, and
1168 * complete checksum manually on outgoing path.
1169 */
1170int skb_checksum_help(struct sk_buff *skb)
1171{
1172        __wsum csum;
1173        int ret = 0, offset = skb->h.raw - skb->data;
1174
1175        if (skb->ip_summed == CHECKSUM_COMPLETE)
1176                goto out_set_summed;
1177
1178        if (unlikely(skb_shinfo(skb)->gso_size)) {
1179                /* Let GSO fix up the checksum. */
1180                goto out_set_summed;
1181        }
1182
1183        if (skb_cloned(skb)) {
1184                ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1185                if (ret)
1186                        goto out;
1187        }
1188
1189        BUG_ON(offset > (int)skb->len);
1190        csum = skb_checksum(skb, offset, skb->len-offset, 0);
1191
1192        offset = skb->tail - skb->h.raw;
1193        BUG_ON(offset <= 0);
1194        BUG_ON(skb->csum_offset + 2 > offset);
1195
1196        *(__sum16*)(skb->h.raw + skb->csum_offset) = csum_fold(csum);
1197
1198out_set_summed:
1199        skb->ip_summed = CHECKSUM_NONE;
1200out:    
1201        return ret;
1202}
1203
1204/**
1205 *      skb_gso_segment - Perform segmentation on skb.
1206 *      @skb: buffer to segment
1207 *      @features: features for the output path (see dev->features)
1208 *
1209 *      This function segments the given skb and returns a list of segments.
1210 *
1211 *      It may return NULL if the skb requires no segmentation.  This is
1212 *      only possible when GSO is used for verifying header integrity.
1213 */
1214struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1215{
1216        struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1217        struct packet_type *ptype;
1218        __be16 type = skb->protocol;
1219        int err;
1220
1221        BUG_ON(skb_shinfo(skb)->frag_list);
1222
1223        skb->mac.raw = skb->data;
1224        skb->mac_len = skb->nh.raw - skb->data;
1225        __skb_pull(skb, skb->mac_len);
1226
1227        if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1228                if (skb_header_cloned(skb) &&
1229                    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1230                        return ERR_PTR(err);
1231        }
1232
1233        rcu_read_lock();
1234        list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) {
1235                if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1236                        if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1237                                err = ptype->gso_send_check(skb);
1238                                segs = ERR_PTR(err);
1239                                if (err || skb_gso_ok(skb, features))
1240                                        break;
1241                                __skb_push(skb, skb->data - skb->nh.raw);
1242                        }
1243                        segs = ptype->gso_segment(skb, features);
1244                        break;
1245                }
1246        }
1247        rcu_read_unlock();
1248
1249        __skb_push(skb, skb->data - skb->mac.raw);
1250
1251        return segs;
1252}
1253
1254EXPORT_SYMBOL(skb_gso_segment);
1255
1256/* Take action when hardware reception checksum errors are detected. */
1257#ifdef CONFIG_BUG
1258void netdev_rx_csum_fault(struct net_device *dev)
1259{
1260        if (net_ratelimit()) {
1261                printk(KERN_ERR "%s: hw csum failure.\n", 
1262                        dev ? dev->name : "<unknown>");
1263                dump_stack();
1264        }
1265}
1266EXPORT_SYMBOL(netdev_rx_csum_fault);
1267#endif
1268
1269/* Actually, we should eliminate this check as soon as we know, that:
1270 * 1. IOMMU is present and allows to map all the memory.
1271 * 2. No high memory really exists on this machine.
1272 */
1273
1274static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1275{
1276#ifdef CONFIG_HIGHMEM
1277        int i;
1278
1279        if (dev->features & NETIF_F_HIGHDMA)
1280                return 0;
1281
1282        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1283                if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1284                        return 1;
1285
1286#endif
1287        return 0;
1288}
1289
1290struct dev_gso_cb {
1291        void (*destructor)(struct sk_buff *skb);
1292};
1293
1294#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1295
1296static void dev_gso_skb_destructor(struct sk_buff *skb)
1297{
1298        struct dev_gso_cb *cb;
1299
1300        do {
1301                struct sk_buff *nskb = skb->next;
1302
1303                skb->next = nskb->next;
1304                nskb->next = NULL;
1305                kfree_skb(nskb);
1306        } while (skb->next);
1307
1308        cb = DEV_GSO_CB(skb);
1309        if (cb->destructor)
1310                cb->destructor(skb);
1311}
1312
1313/**
1314 *      dev_gso_segment - Perform emulated hardware segmentation on skb.
1315 *      @skb: buffer to segment
1316 *
1317 *      This function segments the given skb and stores the list of segments
1318 *      in skb->next.
1319 */
1320static int dev_gso_segment(struct sk_buff *skb)
1321{
1322        struct net_device *dev = skb->dev;
1323        struct sk_buff *segs;
1324        int features = dev->features & ~(illegal_highdma(dev, skb) ?
1325                                         NETIF_F_SG : 0);
1326
1327        segs = skb_gso_segment(skb, features);
1328
1329        /* Verifying header integrity only. */
1330        if (!segs)
1331                return 0;
1332
1333        if (unlikely(IS_ERR(segs)))
1334                return PTR_ERR(segs);
1335
1336        skb->next = segs;
1337        DEV_GSO_CB(skb)->destructor = skb->destructor;
1338        skb->destructor = dev_gso_skb_destructor;
1339
1340        return 0;
1341}
1342
1343int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1344{
1345        if (likely(!skb->next)) {
1346                if (netdev_nit)
1347                        dev_queue_xmit_nit(skb, dev);
1348
1349                if (netif_needs_gso(dev, skb)) {
1350                        if (unlikely(dev_gso_segment(skb)))
1351                                goto out_kfree_skb;
1352                        if (skb->next)
1353                                goto gso;
1354                }
1355
1356                return dev->hard_start_xmit(skb, dev);
1357        }
1358
1359gso:
1360        do {
1361                struct sk_buff *nskb = skb->next;
1362                int rc;
1363
1364                skb->next = nskb->next;
1365                nskb->next = NULL;
1366                rc = dev->hard_start_xmit(nskb, dev);
1367                if (unlikely(rc)) {
1368                        nskb->next = skb->next;
1369                        skb->next = nskb;
1370                        return rc;
1371                }
1372                if (unlikely(netif_queue_stopped(dev) && skb->next))
1373                        return NETDEV_TX_BUSY;
1374        } while (skb->next);
1375        
1376        skb->destructor = DEV_GSO_CB(skb)->destructor;
1377
1378out_kfree_skb:
1379        kfree_skb(skb);
1380        return 0;
1381}
1382
1383#define HARD_TX_LOCK(dev, cpu) {                        \
1384        if ((dev->features & NETIF_F_LLTX) == 0) {      \
1385                netif_tx_lock(dev);                     \
1386        }                                               \
1387}
1388
1389#define HARD_TX_UNLOCK(dev) {                           \
1390        if ((dev->features & NETIF_F_LLTX) == 0) {      \
1391                netif_tx_unlock(dev);                   \
1392        }                                               \
1393}
1394
1395/**
1396 *      dev_queue_xmit - transmit a buffer
1397 *      @skb: buffer to transmit
1398 *
1399 *      Queue a buffer for transmission to a network device. The caller must
1400 *      have set the device and priority and built the buffer before calling
1401 *      this function. The function can be called from an interrupt.
1402 *
1403 *      A negative errno code is returned on a failure. A success does not
1404 *      guarantee the frame will be transmitted as it may be dropped due
1405 *      to congestion or traffic shaping.
1406 *
1407 * -----------------------------------------------------------------------------------
1408 *      I notice this method can also return errors from the queue disciplines,
1409 *      including NET_XMIT_DROP, which is a positive value.  So, errors can also
1410 *      be positive.
1411 *
1412 *      Regardless of the return value, the skb is consumed, so it is currently
1413 *      difficult to retry a send to this method.  (You can bump the ref count
1414 *      before sending to hold a reference for retry if you are careful.)
1415 *
1416 *      When calling this method, interrupts MUST be enabled.  This is because
1417 *      the BH enable code must have IRQs enabled so that it will not deadlock.
1418 *          --BLG
1419 */
1420
1421int dev_queue_xmit(struct sk_buff *skb)
1422{
1423        struct net_device *dev = skb->dev;
1424        struct Qdisc *q;
1425        int rc = -ENOMEM;
1426
1427        /* GSO will handle the following emulations directly. */
1428        if (netif_needs_gso(dev, skb))
1429                goto gso;
1430
1431        if (skb_shinfo(skb)->frag_list &&
1432            !(dev->features & NETIF_F_FRAGLIST) &&
1433            __skb_linearize(skb))
1434                goto out_kfree_skb;
1435
1436        /* Fragmented skb is linearized if device does not support SG,
1437         * or if at least one of fragments is in highmem and device
1438         * does not support DMA from it.
1439         */
1440        if (skb_shinfo(skb)->nr_frags &&
1441            (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1442            __skb_linearize(skb))
1443                goto out_kfree_skb;
1444
1445        /* If packet is not checksummed and device does not support
1446         * checksumming for this protocol, complete checksumming here.
1447         */
1448        if (skb->ip_summed == CHECKSUM_PARTIAL &&
1449            (!(dev->features & NETIF_F_GEN_CSUM) &&
1450             (!(dev->features & NETIF_F_IP_CSUM) ||
1451              skb->protocol != htons(ETH_P_IP))))
1452                if (skb_checksum_help(skb))
1453                        goto out_kfree_skb;
1454
1455gso:
1456        spin_lock_prefetch(&dev->queue_lock);
1457
1458        /* Disable soft irqs for various locks below. Also 
1459         * stops preemption for RCU. 
1460         */
1461        rcu_read_lock_bh(); 
1462
1463        /* Updates of qdisc are serialized by queue_lock. 
1464         * The struct Qdisc which is pointed to by qdisc is now a 
1465         * rcu structure - it may be accessed without acquiring 
1466         * a lock (but the structure may be stale.) The freeing of the
1467         * qdisc will be deferred until it's known that there are no 
1468         * more references to it.
1469         * 
1470         * If the qdisc has an enqueue function, we still need to 
1471         * hold the queue_lock before calling it, since queue_lock
1472         * also serializes access to the device queue.
1473         */
1474
1475        q = rcu_dereference(dev->qdisc);
1476#ifdef CONFIG_NET_CLS_ACT
1477        skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1478#endif
1479        if (q->enqueue) {
1480                /* Grab device queue */
1481                spin_lock(&dev->queue_lock);
1482                q = dev->qdisc;
1483                if (q->enqueue) {
1484                        rc = q->enqueue(skb, q);
1485                        qdisc_run(dev);
1486                        spin_unlock(&dev->queue_lock);
1487
1488                        rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1489                        goto out;
1490                }
1491                spin_unlock(&dev->queue_lock);
1492        }
1493
1494        /* The device has no queue. Common case for software devices:
1495           loopback, all the sorts of tunnels...
1496
1497           Really, it is unlikely that netif_tx_lock protection is necessary
1498           here.  (f.e. loopback and IP tunnels are clean ignoring statistics
1499           counters.)
1500           However, it is possible, that they rely on protection
1501           made by us here.
1502
1503           Check this and shot the lock. It is not prone from deadlocks.
1504           Either shot noqueue qdisc, it is even simpler 8)
1505         */
1506        if (dev->flags & IFF_UP) {
1507                int cpu = smp_processor_id(); /* ok because BHs are off */
1508
1509                if (dev->xmit_lock_owner != cpu) {
1510
1511                        HARD_TX_LOCK(dev, cpu);
1512
1513                        if (!netif_queue_stopped(dev)) {
1514                                rc = 0;
1515                                if (!dev_hard_start_xmit(skb, dev)) {
1516                                        HARD_TX_UNLOCK(dev);
1517                                        goto out;
1518                                }
1519                        }
1520                        HARD_TX_UNLOCK(dev);
1521                        if (net_ratelimit())
1522                                printk(KERN_CRIT "Virtual device %s asks to "
1523                                       "queue packet!\n", dev->name);
1524                } else {
1525                        /* Recursion is detected! It is possible,
1526                         * unfortunately */
1527                        if (net_ratelimit())
1528                                printk(KERN_CRIT "Dead loop on virtual device "
1529                                       "%s, fix it urgently!\n", dev->name);
1530                }
1531        }
1532
1533        rc = -ENETDOWN;
1534        rcu_read_unlock_bh();
1535
1536out_kfree_skb:
1537        kfree_skb(skb);
1538        return rc;
1539out:
1540        rcu_read_unlock_bh();
1541        return rc;
1542}
1543
1544
1545/*=======================================================================
1546                        Receiver routines
1547  =======================================================================*/
1548
1549int netdev_max_backlog = 1000;
1550int netdev_budget = 300;
1551int weight_p = 64;            /* old backlog weight */
1552
1553DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1554
1555
1556/**
1557 *      netif_rx        -       post buffer to the network code
1558 *      @skb: buffer to post
1559 *
1560 *      This function receives a packet from a device driver and queues it for
1561 *      the upper (protocol) levels to process.  It always succeeds. The buffer
1562 *      may be dropped during processing for congestion control or by the
1563 *      protocol layers.
1564 *
1565 *      return values:
1566 *      NET_RX_SUCCESS  (no congestion)
1567 *      NET_RX_CN_LOW   (low congestion)
1568 *      NET_RX_CN_MOD   (moderate congestion)
1569 *      NET_RX_CN_HIGH  (high congestion)
1570 *      NET_RX_DROP     (packet was dropped)
1571 *
1572 */
1573
1574int netif_rx(struct sk_buff *skb)
1575{
1576        struct softnet_data *queue;
1577        unsigned long flags;
1578
1579        /* if netpoll wants it, pretend we never saw it */
1580        if (netpoll_rx(skb))
1581                return NET_RX_DROP;
1582
1583        if (!skb->tstamp.off_sec)
1584                net_timestamp(skb);
1585
1586        /*
1587         * The code is rearranged so that the path is the most
1588         * short when CPU is congested, but is still operating.
1589         */
1590        local_irq_save(flags);
1591        queue = &__get_cpu_var(softnet_data);
1592
1593        __get_cpu_var(netdev_rx_stat).total++;
1594        if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1595                if (queue->input_pkt_queue.qlen) {
1596enqueue:
1597                        dev_hold(skb->dev);
1598                        __skb_queue_tail(&queue->input_pkt_queue, skb);
1599                        local_irq_restore(flags);
1600                        return NET_RX_SUCCESS;
1601                }
1602
1603                netif_rx_schedule(&queue->backlog_dev);
1604                goto enqueue;
1605        }
1606
1607        __get_cpu_var(netdev_rx_stat).dropped++;
1608        local_irq_restore(flags);
1609
1610        kfree_skb(skb);
1611        return NET_RX_DROP;
1612}
1613
1614int netif_rx_ni(struct sk_buff *skb)
1615{
1616        int err;
1617
1618        preempt_disable();
1619        err = netif_rx(skb);
1620        if (local_softirq_pending())
1621                do_softirq();
1622        preempt_enable();
1623
1624        return err;
1625}
1626
1627EXPORT_SYMBOL(netif_rx_ni);
1628
1629static inline struct net_device *skb_bond(struct sk_buff *skb)
1630{
1631        struct net_device *dev = skb->dev;
1632
1633        if (dev->master) {
1634                if (skb_bond_should_drop(skb)) {
1635                        kfree_skb(skb);
1636                        return NULL;
1637                }
1638                skb->dev = dev->master;
1639        }
1640
1641        return dev;
1642}
1643
1644static void net_tx_action(struct softirq_action *h)
1645{
1646        struct softnet_data *sd = &__get_cpu_var(softnet_data);
1647
1648        if (sd->completion_queue) {
1649                struct sk_buff *clist;
1650
1651                local_irq_disable();
1652                clist = sd->completion_queue;
1653                sd->completion_queue = NULL;
1654                local_irq_enable();
1655
1656                while (clist) {
1657                        struct sk_buff *skb = clist;
1658                        clist = clist->next;
1659
1660                        BUG_TRAP(!atomic_read(&skb->users));
1661                        __kfree_skb(skb);
1662                }
1663        }
1664
1665        if (sd->output_queue) {
1666                struct net_device *head;
1667
1668                local_irq_disable();
1669                head = sd->output_queue;
1670                sd->output_queue = NULL;
1671                local_irq_enable();
1672
1673                while (head) {
1674                        struct net_device *dev = head;
1675                        head = head->next_sched;
1676
1677                        smp_mb__before_clear_bit();
1678                        clear_bit(__LINK_STATE_SCHED, &dev->state);
1679
1680                        if (spin_trylock(&dev->queue_lock)) {
1681                                qdisc_run(dev);
1682                                spin_unlock(&dev->queue_lock);
1683                        } else {
1684                                netif_schedule(dev);
1685                        }
1686                }
1687        }
1688}
1689
1690static __inline__ int deliver_skb(struct sk_buff *skb,
1691                                  struct packet_type *pt_prev,
1692                                  struct net_device *orig_dev)
1693{
1694        atomic_inc(&skb->users);
1695        return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1696}
1697
1698#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1699int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
1700struct net_bridge;
1701struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1702                                                unsigned char *addr);
1703void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
1704
1705static __inline__ int handle_bridge(struct sk_buff **pskb,
1706                                    struct packet_type **pt_prev, int *ret,
1707                                    struct net_device *orig_dev)
1708{
1709        struct net_bridge_port *port;
1710
1711        if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
1712            (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
1713                return 0;
1714
1715        if (*pt_prev) {
1716                *ret = deliver_skb(*pskb, *pt_prev, orig_dev);
1717                *pt_prev = NULL;
1718        } 
1719        
1720        return br_handle_frame_hook(port, pskb);
1721}
1722#else
1723#define handle_bridge(skb, pt_prev, ret, orig_dev)      (0)
1724#endif
1725
1726#ifdef CONFIG_NET_CLS_ACT
1727/* TODO: Maybe we should just force sch_ingress to be compiled in
1728 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1729 * a compare and 2 stores extra right now if we dont have it on
1730 * but have CONFIG_NET_CLS_ACT
1731 * NOTE: This doesnt stop any functionality; if you dont have 
1732 * the ingress scheduler, you just cant add policies on ingress.
1733 *
1734 */
1735static int ing_filter(struct sk_buff *skb) 
1736{
1737        struct Qdisc *q;
1738        struct net_device *dev = skb->dev;
1739        int result = TC_ACT_OK;
1740        
1741        if (dev->qdisc_ingress) {
1742                __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1743                if (MAX_RED_LOOP < ttl++) {
1744                        printk(KERN_WARNING "Redir loop detected Dropping packet (%s->%s)\n",
1745                                skb->input_dev->name, skb->dev->name);
1746                        return TC_ACT_SHOT;
1747                }
1748
1749                skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1750
1751                skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
1752
1753                spin_lock(&dev->ingress_lock);
1754                if ((q = dev->qdisc_ingress) != NULL)
1755                        result = q->enqueue(skb, q);
1756                spin_unlock(&dev->ingress_lock);
1757
1758        }
1759
1760        return result;
1761}
1762#endif
1763
1764int netif_receive_skb(struct sk_buff *skb)
1765{
1766        struct packet_type *ptype, *pt_prev;
1767        struct net_device *orig_dev;
1768        int ret = NET_RX_DROP;
1769        __be16 type;
1770
1771        /* if we've gotten here through NAPI, check netpoll */
1772        if (skb->dev->poll && netpoll_rx(skb))
1773                return NET_RX_DROP;
1774
1775        if (!skb->tstamp.off_sec)
1776                net_timestamp(skb);
1777
1778        if (!skb->input_dev)
1779                skb->input_dev = skb->dev;
1780
1781        orig_dev = skb_bond(skb);
1782
1783        if (!orig_dev)
1784                return NET_RX_DROP;
1785
1786        __get_cpu_var(netdev_rx_stat).total++;
1787
1788        skb->h.raw = skb->nh.raw = skb->data;
1789        skb->mac_len = skb->nh.raw - skb->mac.raw;
1790
1791        pt_prev = NULL;
1792
1793        rcu_read_lock();
1794
1795#ifdef CONFIG_NET_CLS_ACT
1796        if (skb->tc_verd & TC_NCLS) {
1797                skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
1798                goto ncls;
1799        }
1800#endif
1801
1802        list_for_each_entry_rcu(ptype, &ptype_all, list) {
1803                if (!ptype->dev || ptype->dev == skb->dev) {
1804                        if (pt_prev) 
1805                                ret = deliver_skb(skb, pt_prev, orig_dev);
1806                        pt_prev = ptype;
1807                }
1808        }
1809
1810#ifdef CONFIG_NET_CLS_ACT
1811        if (pt_prev) {
1812                ret = deliver_skb(skb, pt_prev, orig_dev);
1813                pt_prev = NULL; /* noone else should process this after*/
1814        } else {
1815                skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
1816        }
1817
1818        ret = ing_filter(skb);
1819
1820        if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
1821                kfree_skb(skb);
1822                goto out;
1823        }
1824
1825        skb->tc_verd = 0;
1826ncls:
1827#endif
1828
1829        if (handle_bridge(&skb, &pt_prev, &ret, orig_dev))
1830                goto out;
1831
1832        type = skb->protocol;
1833        list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
1834                if (ptype->type == type &&
1835                    (!ptype->dev || ptype->dev == skb->dev)) {
1836                        if (pt_prev) 
1837                                ret = deliver_skb(skb, pt_prev, orig_dev);
1838                        pt_prev = ptype;
1839                }
1840        }
1841
1842        if (pt_prev) {
1843                ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1844        } else {
1845                kfree_skb(skb);
1846                /* Jamal, now you will not able to escape explaining
1847                 * me how you were going to use this. :-)
1848                 */
1849                ret = NET_RX_DROP;
1850        }
1851
1852out:
1853        rcu_read_unlock();
1854        return ret;
1855}
1856
1857static int process_backlog(struct net_device *backlog_dev, int *budget)
1858{
1859        int work = 0;
1860        int quota = min(backlog_dev->quota, *budget);
1861        struct softnet_data *queue = &__get_cpu_var(softnet_data);
1862        unsigned long start_time = jiffies;
1863
1864        backlog_dev->weight = weight_p;
1865        for (;;) {
1866                struct sk_buff *skb;
1867                struct net_device *dev;
1868
1869                local_irq_disable();
1870                skb = __skb_dequeue(&queue->input_pkt_queue);
1871                if (!skb)
1872                        goto job_done;
1873                local_irq_enable();
1874
1875                dev = skb->dev;
1876
1877                netif_receive_skb(skb);
1878
1879                dev_put(dev);
1880
1881                work++;
1882
1883                if (work >= quota || jiffies - start_time > 1)
1884                        break;
1885
1886        }
1887
1888        backlog_dev->quota -= work;
1889        *budget -= work;
1890        return -1;
1891
1892job_done:
1893        backlog_dev->quota -= work;
1894        *budget -= work;
1895
1896        list_del(&backlog_dev->poll_list);
1897        smp_mb__before_clear_bit();
1898        netif_poll_enable(backlog_dev);
1899
1900        local_irq_enable();
1901        return 0;
1902}
1903
1904static void net_rx_action(struct softirq_action *h)
1905{
1906        struct softnet_data *queue = &__get_cpu_var(softnet_data);
1907        unsigned long start_time = jiffies;
1908        int budget = netdev_budget;
1909        void *have;
1910
1911        local_irq_disable();
1912
1913        while (!list_empty(&queue->poll_list)) {
1914                struct net_device *dev;
1915
1916                if (budget <= 0 || jiffies - start_time > 1)
1917                        goto softnet_break;
1918
1919                local_irq_enable();
1920
1921                dev = list_entry(queue->poll_list.next,
1922                                 struct net_device, poll_list);
1923                have = netpoll_poll_lock(dev);
1924
1925                if (dev->quota <= 0 || dev->poll(dev, &budget)) {
1926                        netpoll_poll_unlock(have);
1927                        local_irq_disable();
1928                        list_move_tail(&dev->poll_list, &queue->poll_list);
1929                        if (dev->quota < 0)
1930                                dev->quota += dev->weight;
1931                        else
1932                                dev->quota = dev->weight;
1933                } else {
1934                        netpoll_poll_unlock(have);
1935                        dev_put(dev);
1936                        local_irq_disable();
1937                }
1938        }
1939out:
1940#ifdef CONFIG_NET_DMA
1941        /*
1942         * There may not be any more sk_buffs coming right now, so push
1943         * any pending DMA copies to hardware
1944         */
1945        if (net_dma_client) {
1946                struct dma_chan *chan;
1947                rcu_read_lock();
1948                list_for_each_entry_rcu(chan, &net_dma_client->channels, client_node)
1949                        dma_async_memcpy_issue_pending(chan);
1950                rcu_read_unlock();
1951        }
1952#endif
1953        local_irq_enable();
1954        return;
1955
1956softnet_break:
1957        __get_cpu_var(netdev_rx_stat).time_squeeze++;
1958        __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1959        goto out;
1960}
1961
1962static gifconf_func_t * gifconf_list [NPROTO];
1963
1964/**
1965 *      register_gifconf        -       register a SIOCGIF handler
1966 *      @family: Address family
1967 *      @gifconf: Function handler
1968 *
1969 *      Register protocol dependent address dumping routines. The handler
1970 *      that is passed must not be freed or reused until it has been replaced
1971 *      by another handler.
1972 */
1973int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
1974{
1975        if (family >= NPROTO)
1976                return -EINVAL;
1977        gifconf_list[family] = gifconf;
1978        return 0;
1979}
1980
1981
1982/*
1983 *      Map an interface index to its name (SIOCGIFNAME)
1984 */
1985
1986/*
1987 *      We need this ioctl for efficient implementation of the
1988 *      if_indextoname() function required by the IPv6 API.  Without
1989 *      it, we would have to search all the interfaces to find a
1990 *      match.  --pb
1991 */
1992
1993static int dev_ifname(struct ifreq __user *arg)
1994{
1995        struct net_device *dev;
1996        struct ifreq ifr;
1997
1998        /*
1999         *      Fetch the caller's info block.
2000         */
2001
2002        if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2003                return -EFAULT;
2004
2005        read_lock(&dev_base_lock);
2006        dev = __dev_get_by_index(ifr.ifr_ifindex);
2007        if (!dev) {
2008                read_unlock(&dev_base_lock);
2009                return -ENODEV;
2010        }
2011
2012        strcpy(ifr.ifr_name, dev->name);
2013        read_unlock(&dev_base_lock);
2014
2015        if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2016                return -EFAULT;
2017        return 0;
2018}
2019
2020/*
2021 *      Perform a SIOCGIFCONF call. This structure will change
2022 *      size eventually, and there is nothing I can do about it.
2023 *      Thus we will need a 'compatibility mode'.
2024 */
2025
2026static int dev_ifconf(char __user *arg)
2027{
2028        struct ifconf ifc;
2029        struct net_device *dev;
2030        char __user *pos;
2031        int len;
2032        int total;
2033        int i;
2034
2035        /*
2036         *      Fetch the caller's info block.
2037         */
2038
2039        if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2040                return -EFAULT;
2041
2042        pos = ifc.ifc_buf;
2043        len = ifc.ifc_len;
2044
2045        /*
2046         *      Loop over the interfaces, and write an info block for each.
2047         */
2048
2049        total = 0;
2050        for (dev = dev_base; dev; dev = dev->next) {
2051                for (i = 0; i < NPROTO; i++) {
2052                        if (gifconf_list[i]) {
2053                                int done;
2054                                if (!pos)
2055                                        done = gifconf_list[i](dev, NULL, 0);
2056                                else
2057                                        done = gifconf_list[i](dev, pos + total,
2058                                                               len - total);
2059                                if (done < 0)
2060                                        return -EFAULT;
2061                                total += done;
2062                        }
2063                }
2064        }
2065
2066        /*
2067         *      All done.  Write the updated control block back to the caller.
2068         */
2069        ifc.ifc_len = total;
2070
2071        /*
2072         *      Both BSD and Solaris return 0 here, so we do too.
2073         */
2074        return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2075}
2076
2077#ifdef CONFIG_PROC_FS
2078/*
2079 *      This is invoked by the /proc filesystem handler to display a device
2080 *      in detail.
2081 */
2082static __inline__ struct net_device *dev_get_idx(loff_t pos)
2083{
2084        struct net_device *dev;
2085        loff_t i;
2086
2087        for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
2088
2089        return i == pos ? dev : NULL;
2090}
2091
2092void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2093{
2094        read_lock(&dev_base_lock);
2095        return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
2096}
2097
2098void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2099{
2100        ++*pos;
2101        return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
2102}
2103
2104void dev_seq_stop(struct seq_file *seq, void *v)
2105{
2106        read_unlock(&dev_base_lock);
2107}
2108
2109static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2110{
2111        if (dev->get_stats) {
2112                struct net_device_stats *stats = dev->get_stats(dev);
2113
2114                seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2115                                "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2116                           dev->name, stats->rx_bytes, stats->rx_packets,
2117                           stats->rx_errors,
2118                           stats->rx_dropped + stats->rx_missed_errors,
2119                           stats->rx_fifo_errors,
2120                           stats->rx_length_errors + stats->rx_over_errors +
2121                             stats->rx_crc_errors + stats->rx_frame_errors,
2122                           stats->rx_compressed, stats->multicast,
2123                           stats->tx_bytes, stats->tx_packets,
2124                           stats->tx_errors, stats->tx_dropped,
2125                           stats->tx_fifo_errors, stats->collisions,
2126                           stats->tx_carrier_errors +
2127                             stats->tx_aborted_errors +
2128                             stats->tx_window_errors +
2129                             stats->tx_heartbeat_errors,
2130                           stats->tx_compressed);
2131        } else
2132                seq_printf(seq, "%6s: No statistics available.\n", dev->name);
2133}
2134
2135/*
2136 *      Called from the PROCfs module. This now uses the new arbitrary sized
2137 *      /proc/net interface to create /proc/net/dev
2138 */
2139static int dev_seq_show(struct seq_file *seq, void *v)
2140{
2141        if (v == SEQ_START_TOKEN)
2142                seq_puts(seq, "Inter-|   Receive                            "
2143                              "                    |  Transmit\n"
2144                              " face |bytes    packets errs drop fifo frame "
2145                              "compressed multicast|bytes    packets errs "
2146                              "drop fifo colls carrier compressed\n");
2147        else
2148                dev_seq_printf_stats(seq, v);
2149        return 0;
2150}
2151
2152static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2153{
2154        struct netif_rx_stats *rc = NULL;
2155
2156        while (*pos < NR_CPUS)
2157                if (cpu_online(*pos)) {
2158                        rc = &per_cpu(netdev_rx_stat, *pos);
2159                        break;
2160                } else
2161                        ++*pos;
2162        return rc;
2163}
2164
2165static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2166{
2167        return softnet_get_online(pos);
2168}
2169
2170static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2171{
2172        ++*pos;
2173        return softnet_get_online(pos);
2174}
2175
2176static void softnet_seq_stop(struct seq_file *seq, void *v)
2177{
2178}
2179
2180static int softnet_seq_show(struct seq_file *seq, void *v)
2181{
2182        struct netif_rx_stats *s = v;
2183
2184        seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2185                   s->total, s->dropped, s->time_squeeze, 0,
2186                   0, 0, 0, 0, /* was fastroute */
2187                   s->cpu_collision );
2188        return 0;
2189}
2190
2191static struct seq_operations dev_seq_ops = {
2192        .start = dev_seq_start,
2193        .next  = dev_seq_next,
2194        .stop  = dev_seq_stop,
2195        .show  = dev_seq_show,
2196};
2197
2198static int dev_seq_open(struct inode *inode, struct file *file)
2199{
2200        return seq_open(file, &dev_seq_ops);
2201}
2202
2203static struct file_operations dev_seq_fops = {
2204        .owner   = THIS_MODULE,
2205        .open    = dev_seq_open,
2206        .read    = seq_read,
2207        .llseek  = seq_lseek,
2208        .release = seq_release,
2209};
2210
2211static struct seq_operations softnet_seq_ops = {
2212        .start = softnet_seq_start,
2213        .next  = softnet_seq_next,
2214        .stop  = softnet_seq_stop,
2215        .show  = softnet_seq_show,
2216};
2217
2218static int softnet_seq_open(struct inode *inode, struct file *file)
2219{
2220        return seq_open(file, &softnet_seq_ops);
2221}
2222
2223static struct file_operations softnet_seq_fops = {
2224        .owner   = THIS_MODULE,
2225        .open    = softnet_seq_open,
2226        .read    = seq_read,
2227        .llseek  = seq_lseek,
2228        .release = seq_release,
2229};
2230
2231#ifdef CONFIG_WIRELESS_EXT
2232extern int wireless_proc_init(void);
2233#else
2234#define wireless_proc_init() 0
2235#endif
2236
2237static int __init dev_proc_init(void)
2238{
2239        int rc = -ENOMEM;
2240
2241        if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
2242                goto out;
2243        if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
2244                goto out_dev;
2245        if (wireless_proc_init())
2246                goto out_softnet;
2247        rc = 0;
2248out:
2249        return rc;
2250out_softnet:
2251        proc_net_remove("softnet_stat");
2252out_dev:
2253        proc_net_remove("dev");
2254        goto out;
2255}
2256#else
2257#define dev_proc_init() 0
2258#endif  /* CONFIG_PROC_FS */
2259
2260
2261/**
2262 *      netdev_set_master       -       set up master/slave pair
2263 *      @slave: slave device
2264 *      @master: new master device
2265 *
2266 *      Changes the master device of the slave. Pass %NULL to break the
2267 *      bonding. The caller must hold the RTNL semaphore. On a failure
2268 *      a negative errno code is returned. On success the reference counts
2269 *      are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2270 *      function returns zero.
2271 */
2272int netdev_set_master(struct net_device *slave, struct net_device *master)
2273{
2274        struct net_device *old = slave->master;
2275
2276        ASSERT_RTNL();
2277
2278        if (master) {
2279                if (old)
2280                        return -EBUSY;
2281                dev_hold(master);
2282        }
2283
2284        slave->master = master;
2285        
2286        synchronize_net();
2287
2288        if (old)
2289                dev_put(old);
2290
2291        if (master)
2292                slave->flags |= IFF_SLAVE;
2293        else
2294                slave->flags &= ~IFF_SLAVE;
2295
2296        rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2297        return 0;
2298}
2299
2300/**
2301 *      dev_set_promiscuity     - update promiscuity count on a device
2302 *      @dev: device
2303 *      @inc: modifier
2304 *
2305 *      Add or remove promiscuity from a device. While the count in the device
2306 *      remains above zero the interface remains promiscuous. Once it hits zero
2307 *      the device reverts back to normal filtering operation. A negative inc
2308 *      value is used to drop promiscuity on the device.
2309 */
2310void dev_set_promiscuity(struct net_device *dev, int inc)
2311{
2312        unsigned short old_flags = dev->flags;
2313
2314        if ((dev->promiscuity += inc) == 0)
2315                dev->flags &= ~IFF_PROMISC;
2316        else
2317                dev->flags |= IFF_PROMISC;
2318        if (dev->flags != old_flags) {
2319                dev_mc_upload(dev);
2320                printk(KERN_INFO "device %s %s promiscuous mode\n",
2321                       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2322                                                               "left");
2323                audit_log(current->audit_context, GFP_ATOMIC,
2324                        AUDIT_ANOM_PROMISCUOUS,
2325                        "dev=%s prom=%d old_prom=%d auid=%u",
2326                        dev->name, (dev->flags & IFF_PROMISC),
2327                        (old_flags & IFF_PROMISC),
2328                        audit_get_loginuid(current->audit_context)); 
2329        }
2330}
2331
2332/**
2333 *      dev_set_allmulti        - update allmulti count on a device
2334 *      @dev: device
2335 *      @inc: modifier
2336 *
2337 *      Add or remove reception of all multicast frames to a device. While the
2338 *      count in the device remains above zero the interface remains listening
2339 *      to all interfaces. Once it hits zero the device reverts back to normal
2340 *      filtering operation. A negative @inc value is used to drop the counter
2341 *      when releasing a resource needing all multicasts.
2342 */
2343
2344void dev_set_allmulti(struct net_device *dev, int inc)
2345{
2346        unsigned short old_flags = dev->flags;
2347
2348        dev->flags |= IFF_ALLMULTI;
2349        if ((dev->allmulti += inc) == 0)
2350                dev->flags &= ~IFF_ALLMULTI;
2351        if (dev->flags ^ old_flags)
2352                dev_mc_upload(dev);
2353}
2354
2355unsigned dev_get_flags(const struct net_device *dev)
2356{
2357        unsigned flags;
2358
2359        flags = (dev->flags & ~(IFF_PROMISC |
2360                                IFF_ALLMULTI |
2361                                IFF_RUNNING |
2362                                IFF_LOWER_UP |
2363                                IFF_DORMANT)) |
2364                (dev->gflags & (IFF_PROMISC |
2365                                IFF_ALLMULTI));
2366
2367        if (netif_running(dev)) {
2368                if (netif_oper_up(dev))
2369                        flags |= IFF_RUNNING;
2370                if (netif_carrier_ok(dev))
2371                        flags |= IFF_LOWER_UP;
2372                if (netif_dormant(dev))
2373                        flags |= IFF_DORMANT;
2374        }
2375
2376        return flags;
2377}
2378
2379int dev_change_flags(struct net_device *dev, unsigned flags)
2380{
2381        int ret;
2382        int old_flags = dev->flags;
2383
2384        /*
2385         *      Set the flags on our device.
2386         */
2387
2388        dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
2389                               IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
2390                               IFF_AUTOMEDIA)) |
2391                     (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
2392                                    IFF_ALLMULTI));
2393
2394        /*
2395         *      Load in the correct multicast list now the flags have changed.
2396         */
2397
2398        dev_mc_upload(dev);
2399
2400        /*
2401         *      Have we downed the interface. We handle IFF_UP ourselves
2402         *      according to user attempts to set it, rather than blindly
2403         *      setting it.
2404         */
2405
2406        ret = 0;
2407        if ((old_flags ^ flags) & IFF_UP) {     /* Bit is different  ? */
2408                ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
2409
2410                if (!ret)
2411                        dev_mc_upload(dev);
2412        }
2413
2414        if (dev->flags & IFF_UP &&
2415            ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
2416                                          IFF_VOLATILE)))
2417                raw_notifier_call_chain(&netdev_chain,
2418                                NETDEV_CHANGE, dev);
2419
2420        if ((flags ^ dev->gflags) & IFF_PROMISC) {
2421                int inc = (flags & IFF_PROMISC) ? +1 : -1;
2422                dev->gflags ^= IFF_PROMISC;
2423                dev_set_promiscuity(dev, inc);
2424        }
2425
2426        /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
2427           is important. Some (broken) drivers set IFF_PROMISC, when
2428           IFF_ALLMULTI is requested not asking us and not reporting.
2429         */
2430        if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
2431                int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
2432                dev->gflags ^= IFF_ALLMULTI;
2433                dev_set_allmulti(dev, inc);
2434        }
2435
2436        if (old_flags ^ dev->flags)
2437                rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
2438
2439        return ret;
2440}
2441
2442int dev_set_mtu(struct net_device *dev, int new_mtu)
2443{
2444        int err;
2445
2446        if (new_mtu == dev->mtu)
2447                return 0;
2448
2449        /*      MTU must be positive.    */
2450        if (new_mtu < 0)
2451                return -EINVAL;
2452
2453        if (!netif_device_present(dev))
2454                return -ENODEV;
2455
2456        err = 0;
2457        if (dev->change_mtu)
2458                err = dev->change_mtu(dev, new_mtu);
2459        else
2460                dev->mtu = new_mtu;
2461        if (!err && dev->flags & IFF_UP)
2462                raw_notifier_call_chain(&netdev_chain,
2463                                NETDEV_CHANGEMTU, dev);
2464        return err;
2465}
2466
2467int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
2468{
2469        int err;
2470
2471        if (!dev->set_mac_address)
2472                return -EOPNOTSUPP;
2473        if (sa->sa_family != dev->type)
2474                return -EINVAL;
2475        if (!netif_device_present(dev))
2476                return -ENODEV;
2477        err = dev->set_mac_address(dev, sa);
2478        if (!err)
2479                raw_notifier_call_chain(&netdev_chain,
2480                                NETDEV_CHANGEADDR, dev);
2481        return err;
2482}
2483
2484/*
2485 *      Perform the SIOCxIFxxx calls.
2486 */
2487static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
2488{
2489        int err;
2490        struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
2491
2492        if (!dev)
2493                return -ENODEV;
2494
2495        switch (cmd) {
2496                case SIOCGIFFLAGS:      /* Get interface flags */
2497                        ifr->ifr_flags = dev_get_flags(dev);
2498                        return 0;
2499
2500                case SIOCSIFFLAGS:      /* Set interface flags */
2501                        return dev_change_flags(dev, ifr->ifr_flags);
2502
2503                case SIOCGIFMETRIC:     /* Get the metric on the interface
2504                                           (currently unused) */
2505                        ifr->ifr_metric = 0;
2506                        return 0;
2507
2508                case SIOCSIFMETRIC:     /* Set the metric on the interface
2509                                           (currently unused) */
2510                        return -EOPNOTSUPP;
2511
2512                case SIOCGIFMTU:        /* Get the MTU of a device */
2513                        ifr->ifr_mtu = dev->mtu;
2514                        return 0;
2515
2516                case SIOCSIFMTU:        /* Set the MTU of a device */
2517                        return dev_set_mtu(dev, ifr->ifr_mtu);
2518
2519                case SIOCGIFHWADDR:
2520                        if (!dev->addr_len)
2521                                memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
2522                        else
2523                                memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
2524                                       min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2525                        ifr->ifr_hwaddr.sa_family = dev->type;
2526                        return 0;
2527
2528                case SIOCSIFHWADDR:
2529                        return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
2530
2531                case SIOCSIFHWBROADCAST:
2532                        if (ifr->ifr_hwaddr.sa_family != dev->type)
2533                                return -EINVAL;
2534                        memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
2535                               min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2536                        raw_notifier_call_chain(&netdev_chain,
2537                                            NETDEV_CHANGEADDR, dev);
2538                        return 0;
2539
2540                case SIOCGIFMAP:
2541                        ifr->ifr_map.mem_start = dev->mem_start;
2542                        ifr->ifr_map.mem_end   = dev->mem_end;
2543                        ifr->ifr_map.base_addr = dev->base_addr;
2544                        ifr->ifr_map.irq       = dev->irq;
2545                        ifr->ifr_map.dma       = dev->dma;
2546                        ifr->ifr_map.port      = dev->if_port;
2547                        return 0;
2548
2549                case SIOCSIFMAP:
2550                        if (dev->set_config) {
2551                                if (!netif_device_present(dev))
2552                                        return -ENODEV;
2553                                return dev->set_config(dev, &ifr->ifr_map);
2554                        }
2555                        return -EOPNOTSUPP;
2556
2557                case SIOCADDMULTI:
2558                        if (!dev->set_multicast_list ||
2559                            ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2560                                return -EINVAL;
2561                        if (!netif_device_present(dev))
2562                                return -ENODEV;
2563                        return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
2564                                          dev->addr_len, 1);
2565
2566                case SIOCDELMULTI:
2567                        if (!dev->set_multicast_list ||
2568                            ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2569                                return -EINVAL;
2570                        if (!netif_device_present(dev))
2571                                return -ENODEV;
2572                        return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
2573                                             dev->addr_len, 1);
2574
2575                case SIOCGIFINDEX:
2576                        ifr->ifr_ifindex = dev->ifindex;
2577                        return 0;
2578
2579                case SIOCGIFTXQLEN:
2580                        ifr->ifr_qlen = dev->tx_queue_len;
2581                        return 0;
2582
2583                case SIOCSIFTXQLEN:
2584                        if (ifr->ifr_qlen < 0)
2585                                return -EINVAL;
2586                        dev->tx_queue_len = ifr->ifr_qlen;
2587                        return 0;
2588
2589                case SIOCSIFNAME:
2590                        ifr->ifr_newname[IFNAMSIZ-1] = '\0';
2591                        return dev_change_name(dev, ifr->ifr_newname);
2592
2593                /*
2594                 *      Unknown or private ioctl
2595                 */
2596
2597                default:
2598                        if ((cmd >= SIOCDEVPRIVATE &&
2599                            cmd <= SIOCDEVPRIVATE + 15) ||
2600                            cmd == SIOCBONDENSLAVE ||
2601                            cmd == SIOCBONDRELEASE ||
2602                            cmd == SIOCBONDSETHWADDR ||
2603                            cmd == SIOCBONDSLAVEINFOQUERY ||
2604                            cmd == SIOCBONDINFOQUERY ||
2605                            cmd == SIOCBONDCHANGEACTIVE ||
2606                            cmd == SIOCGMIIPHY ||
2607                            cmd == SIOCGMIIREG ||
2608                            cmd == SIOCSMIIREG ||
2609                            cmd == SIOCBRADDIF ||
2610                            cmd == SIOCBRDELIF ||
2611                            cmd == SIOCWANDEV) {
2612                                err = -EOPNOTSUPP;
2613                                if (dev->do_ioctl) {
2614                                        if (netif_device_present(dev))
2615                                                err = dev->do_ioctl(dev, ifr,
2616                                                                    cmd);
2617                                        else
2618                                                err = -ENODEV;
2619                                }
2620                        } else
2621                                err = -EINVAL;
2622
2623        }
2624        return err;
2625}
2626
2627/*
2628 *      This function handles all "interface"-type I/O control requests. The actual
2629 *      'doing' part of this is dev_ifsioc above.
2630 */
2631
2632/**
2633 *      dev_ioctl       -       network device ioctl
2634 *      @cmd: command to issue
2635 *      @arg: pointer to a struct ifreq in user space
2636 *
2637 *      Issue ioctl functions to devices. This is normally called by the
2638 *      user space syscall interfaces but can sometimes be useful for
2639 *      other purposes. The return value is the return from the syscall if
2640 *      positive or a negative errno code on error.
2641 */
2642
2643int dev_ioctl(unsigned int cmd, void __user *arg)
2644{
2645        struct ifreq ifr;
2646        int ret;
2647        char *colon;
2648
2649        /* One special case: SIOCGIFCONF takes ifconf argument
2650           and requires shared lock, because it sleeps writing
2651           to user space.
2652         */
2653
2654        if (cmd == SIOCGIFCONF) {
2655                rtnl_lock();
2656                ret = dev_ifconf((char __user *) arg);
2657                rtnl_unlock();
2658                return ret;
2659        }
2660        if (cmd == SIOCGIFNAME)
2661                return dev_ifname((struct ifreq __user *)arg);
2662
2663        if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2664                return -EFAULT;
2665
2666        ifr.ifr_name[IFNAMSIZ-1] = 0;
2667
2668        colon = strchr(ifr.ifr_name, ':');
2669        if (colon)
2670                *colon = 0;
2671
2672        /*
2673         *      See which interface the caller is talking about.
2674         */
2675
2676        switch (cmd) {
2677                /*
2678                 *      These ioctl calls:
2679                 *      - can be done by all.
2680                 *      - atomic and do not require locking.
2681                 *      - return a value
2682                 */
2683                case SIOCGIFFLAGS:
2684                case SIOCGIFMETRIC:
2685                case SIOCGIFMTU:
2686                case SIOCGIFHWADDR:
2687                case SIOCGIFSLAVE:
2688                case SIOCGIFMAP:
2689                case SIOCGIFINDEX:
2690                case SIOCGIFTXQLEN:
2691                        dev_load(ifr.ifr_name);
2692                        read_lock(&dev_base_lock);
2693                        ret = dev_ifsioc(&ifr, cmd);
2694                        read_unlock(&dev_base_lock);
2695                        if (!ret) {
2696                                if (colon)
2697                                        *colon = ':';
2698                                if (copy_to_user(arg, &ifr,
2699                                                 sizeof(struct ifreq)))
2700                                        ret = -EFAULT;
2701                        }
2702                        return ret;
2703
2704                case SIOCETHTOOL:
2705                        dev_load(ifr.ifr_name);
2706                        rtnl_lock();
2707                        ret = dev_ethtool(&ifr);
2708                        rtnl_unlock();
2709                        if (!ret) {
2710                                if (colon)
2711                                        *colon = ':';
2712                                if (copy_to_user(arg, &ifr,
2713                                                 sizeof(struct ifreq)))
2714                                        ret = -EFAULT;
2715                        }
2716                        return ret;
2717
2718                /*
2719                 *      These ioctl calls:
2720                 *      - require superuser power.
2721                 *      - require strict serialization.
2722                 *      - return a value
2723                 */
2724                case SIOCGMIIPHY:
2725                case SIOCGMIIREG:
2726                case SIOCSIFNAME:
2727                        if (!capable(CAP_NET_ADMIN))
2728                                return -EPERM;
2729                        dev_load(ifr.ifr_name);
2730                        rtnl_lock();
2731                        ret = dev_ifsioc(&ifr, cmd);
2732                        rtnl_unlock();
2733                        if (!ret) {
2734                                if (colon)
2735                                        *colon = ':';
2736                                if (copy_to_user(arg, &ifr,
2737                                                 sizeof(struct ifreq)))
2738                                        ret = -EFAULT;
2739                        }
2740                        return ret;
2741
2742                /*
2743                 *      These ioctl calls:
2744                 *      - require superuser power.
2745                 *      - require strict serialization.
2746                 *      - do not return a value
2747                 */
2748                case SIOCSIFFLAGS:
2749                case SIOCSIFMETRIC:
2750                case SIOCSIFMTU:
2751                case SIOCSIFMAP:
2752                case SIOCSIFHWADDR:
2753                case SIOCSIFSLAVE:
2754                case SIOCADDMULTI:
2755                case SIOCDELMULTI:
2756                case SIOCSIFHWBROADCAST:
2757                case SIOCSIFTXQLEN:
2758                case SIOCSMIIREG:
2759                case SIOCBONDENSLAVE:
2760                case SIOCBONDRELEASE:
2761                case SIOCBONDSETHWADDR:
2762                case SIOCBONDCHANGEACTIVE:
2763                case SIOCBRADDIF:
2764                case SIOCBRDELIF:
2765                        if (!capable(CAP_NET_ADMIN))
2766                                return -EPERM;
2767                        /* fall through */
2768                case SIOCBONDSLAVEINFOQUERY:
2769                case SIOCBONDINFOQUERY:
2770                        dev_load(ifr.ifr_name);
2771                        rtnl_lock();
2772                        ret = dev_ifsioc(&ifr, cmd);
2773                        rtnl_unlock();
2774                        return ret;
2775
2776                case SIOCGIFMEM:
2777                        /* Get the per device memory space. We can add this but
2778                         * currently do not support it */
2779                case SIOCSIFMEM:
2780                        /* Set the per device memory buffer space.
2781                         * Not applicable in our case */
2782                case SIOCSIFLINK:
2783                        return -EINVAL;
2784
2785                /*
2786                 *      Unknown or private ioctl.
2787                 */
2788                default:
2789                        if (cmd == SIOCWANDEV ||
2790                            (cmd >= SIOCDEVPRIVATE &&
2791                             cmd <= SIOCDEVPRIVATE + 15)) {
2792                                dev_load(ifr.ifr_name);
2793                                rtnl_lock();
2794                                ret = dev_ifsioc(&ifr, cmd);
2795                                rtnl_unlock();
2796                                if (!ret && copy_to_user(arg, &ifr,
2797                                                         sizeof(struct ifreq)))
2798                                        ret = -EFAULT;
2799                                return ret;
2800                        }
2801#ifdef CONFIG_WIRELESS_EXT
2802                        /* Take care of Wireless Extensions */
2803                        if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
2804                                /* If command is `set a parameter', or
2805                                 * `get the encoding parameters', check if
2806                                 * the user has the right to do it */
2807                                if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE
2808                                    || cmd == SIOCGIWENCODEEXT) {
2809                                        if (!capable(CAP_NET_ADMIN))
2810                                                return -EPERM;
2811                                }
2812                                dev_load(ifr.ifr_name);
2813                                rtnl_lock();
2814                                /* Follow me in net/core/wireless.c */
2815                                ret = wireless_process_ioctl(&ifr, cmd);
2816                                rtnl_unlock();
2817                                if (IW_IS_GET(cmd) &&
2818                                    copy_to_user(arg, &ifr,
2819                                                 sizeof(struct ifreq)))
2820                                        ret = -EFAULT;
2821                                return ret;
2822                        }
2823#endif  /* CONFIG_WIRELESS_EXT */
2824                        return -EINVAL;
2825        }
2826}
2827
2828
2829/**
2830 *      dev_new_index   -       allocate an ifindex
2831 *
2832 *      Returns a suitable unique value for a new device interface
2833 *      number.  The caller must hold the rtnl semaphore or the
2834 *      dev_base_lock to be sure it remains unique.
2835 */
2836static int dev_new_index(void)
2837{
2838        static int ifindex;
2839        for (;;) {
2840                if (++ifindex <= 0)
2841                        ifindex = 1;
2842                if (!__dev_get_by_index(ifindex))
2843                        return ifindex;
2844        }
2845}
2846
2847static int dev_boot_phase = 1;
2848
2849/* Delayed registration/unregisteration */
2850static DEFINE_SPINLOCK(net_todo_list_lock);
2851static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
2852
2853static inline void net_set_todo(struct net_device *dev)
2854{
2855        spin_lock(&net_todo_list_lock);
2856        list_add_tail(&dev->todo_list, &net_todo_list);
2857        spin_unlock(&net_todo_list_lock);
2858}
2859
2860/**
2861 *      register_netdevice      - register a network device
2862 *      @dev: device to register
2863 *
2864 *      Take a completed network device structure and add it to the kernel
2865 *      interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2866 *      chain. 0 is returned on success. A negative errno code is returned
2867 *      on a failure to set up the device, or if the name is a duplicate.
2868 *
2869 *      Callers must hold the rtnl semaphore. You may want
2870 *      register_netdev() instead of this.
2871 *
2872 *      BUGS:
2873 *      The locking appears insufficient to guarantee two parallel registers
2874 *      will not get the same name.
2875 */
2876
2877int register_netdevice(struct net_device *dev)
2878{
2879        struct hlist_head *head;
2880        struct hlist_node *p;
2881        int ret;
2882
2883        BUG_ON(dev_boot_phase);
2884        ASSERT_RTNL();
2885
2886        might_sleep();
2887
2888        /* When net_device's are persistent, this will be fatal. */
2889        BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
2890
2891        spin_lock_init(&dev->queue_lock);
2892        spin_lock_init(&dev->_xmit_lock);
2893        dev->xmit_lock_owner = -1;
2894#ifdef CONFIG_NET_CLS_ACT
2895        spin_lock_init(&dev->ingress_lock);
2896#endif
2897
2898        dev->iflink = -1;
2899
2900        /* Init, if this function is available */
2901        if (dev->init) {
2902                ret = dev->init(dev);
2903                if (ret) {
2904                        if (ret > 0)
2905                                ret = -EIO;
2906                        goto out;
2907                }
2908        }
2909 
2910        if (!dev_valid_name(dev->name)) {
2911                ret = -EINVAL;
2912                goto out;
2913        }
2914
2915        dev->ifindex = dev_new_index();
2916        if (dev->iflink == -1)
2917                dev->iflink = dev->ifindex;
2918
2919        /* Check for existence of name */
2920        head = dev_name_hash(dev->name);
2921        hlist_for_each(p, head) {
2922                struct net_device *d
2923                        = hlist_entry(p, struct net_device, name_hlist);
2924                if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
2925                        ret = -EEXIST;
2926                        goto out;
2927                }
2928        }
2929
2930        /* Fix illegal SG+CSUM combinations. */
2931        if ((dev->features & NETIF_F_SG) &&
2932            !(dev->features & NETIF_F_ALL_CSUM)) {
2933                printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
2934                       dev->name);
2935                dev->features &= ~NETIF_F_SG;
2936        }
2937
2938        /* TSO requires that SG is present as well. */
2939        if ((dev->features & NETIF_F_TSO) &&
2940            !(dev->features & NETIF_F_SG)) {
2941                printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
2942                       dev->name);
2943                dev->features &= ~NETIF_F_TSO;
2944        }
2945        if (dev->features & NETIF_F_UFO) {
2946                if (!(dev->features & NETIF_F_HW_CSUM)) {
2947                        printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
2948                                        "NETIF_F_HW_CSUM feature.\n",
2949                                                        dev->name);
2950                        dev->features &= ~NETIF_F_UFO;
2951                }
2952                if (!(dev->features & NETIF_F_SG)) {
2953                        printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
2954                                        "NETIF_F_SG feature.\n",
2955                                        dev->name);
2956                        dev->features &= ~NETIF_F_UFO;
2957                }
2958        }
2959
2960        /*
2961         *      nil rebuild_header routine,
2962         *      that should be never called and used as just bug trap.
2963         */
2964
2965        if (!dev->rebuild_header)
2966                dev->rebuild_header = default_rebuild_header;
2967
2968        ret = netdev_register_sysfs(dev);
2969        if (ret)
2970                goto out;
2971        dev->reg_state = NETREG_REGISTERED;
2972
2973        /*
2974         *      Default initial state at registry is that the
2975         *      device is present.
2976         */
2977
2978        set_bit(__LINK_STATE_PRESENT, &dev->state);
2979
2980        dev->next = NULL;
2981        dev_init_scheduler(dev);
2982        write_lock_bh(&dev_base_lock);
2983        *dev_tail = dev;
2984        dev_tail = &dev->next;
2985        hlist_add_head(&dev->name_hlist, head);
2986        hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
2987        dev_hold(dev);
2988        write_unlock_bh(&dev_base_lock);
2989
2990        /* Notify protocols, that a new device appeared. */
2991        raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
2992
2993        ret = 0;
2994
2995out:
2996        return ret;
2997}
2998
2999/**
3000 *      register_netdev - register a network device
3001 *      @dev: device to register
3002 *
3003 *      Take a completed network device structure and add it to the kernel
3004 *      interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3005 *      chain. 0 is returned on success. A negative errno code is returned
3006 *      on a failure to set up the device, or if the name is a duplicate.
3007 *
3008 *      This is a wrapper around register_netdev that takes the rtnl semaphore
3009 *      and expands the device name if you passed a format string to
3010 *      alloc_netdev.
3011 */
3012int register_netdev(struct net_device *dev)
3013{
3014        int err;
3015
3016        rtnl_lock();
3017
3018        /*
3019         * If the name is a format string the caller wants us to do a
3020         * name allocation.
3021         */
3022        if (strchr(dev->name, '%')) {
3023                err = dev_alloc_name(dev, dev->name);
3024                if (err < 0)
3025                        goto out;
3026        }
3027        
3028        err = register_netdevice(dev);
3029out:
3030        rtnl_unlock();
3031        return err;
3032}
3033EXPORT_SYMBOL(register_netdev);
3034
3035/*
3036 * netdev_wait_allrefs - wait until all references are gone.
3037 *
3038 * This is called when unregistering network devices.
3039 *
3040 * Any protocol or device that holds a reference should register
3041 * for netdevice notification, and cleanup and put back the
3042 * reference if they receive an UNREGISTER event.
3043 * We can get stuck here if buggy protocols don't correctly
3044 * call dev_put. 
3045 */
3046static void netdev_wait_allrefs(struct net_device *dev)
3047{
3048        unsigned long rebroadcast_time, warning_time;
3049
3050        rebroadcast_time = warning_time = jiffies;
3051        while (atomic_read(&dev->refcnt) != 0) {
3052                if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3053                        rtnl_lock();
3054
3055                        /* Rebroadcast unregister notification */
3056                        raw_notifier_call_chain(&netdev_chain,
3057                                            NETDEV_UNREGISTER, dev);
3058
3059                        if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3060                                     &dev->state)) {
3061                                /* We must not have linkwatch events
3062                                 * pending on unregister. If this
3063                                 * happens, we simply run the queue
3064                                 * unscheduled, resulting in a noop
3065                                 * for this device.
3066                                 */
3067                                linkwatch_run_queue();
3068                        }
3069
3070                        __rtnl_unlock();
3071
3072                        rebroadcast_time = jiffies;
3073                }
3074
3075                msleep(250);
3076
3077                if (time_after(jiffies, warning_time + 10 * HZ)) {
3078                        printk(KERN_EMERG "unregister_netdevice: "
3079                               "waiting for %s to become free. Usage "
3080                               "count = %d\n",
3081                               dev->name, atomic_read(&dev->refcnt));
3082                        warning_time = jiffies;
3083                }
3084        }
3085}
3086
3087/* The sequence is:
3088 *
3089 *      rtnl_lock();
3090 *      ...
3091 *      register_netdevice(x1);
3092 *      register_netdevice(x2);
3093 *      ...
3094 *      unregister_netdevice(y1);
3095 *      unregister_netdevice(y2);
3096 *      ...
3097 *      rtnl_unlock();
3098 *      free_netdev(y1);
3099 *      free_netdev(y2);
3100 *
3101 * We are invoked by rtnl_unlock() after it drops the semaphore.
3102 * This allows us to deal with problems:
3103 * 1) We can delete sysfs objects which invoke hotplug
3104 *    without deadlocking with linkwatch via keventd.
3105 * 2) Since we run with the RTNL semaphore not held, we can sleep
3106 *    safely in order to wait for the netdev refcnt to drop to zero.
3107 */
3108static DEFINE_MUTEX(net_todo_run_mutex);
3109void netdev_run_todo(void)
3110{
3111        struct list_head list;
3112
3113        /* Need to guard against multiple cpu's getting out of order. */
3114        mutex_lock(&net_todo_run_mutex);
3115
3116        /* Not safe to do outside the semaphore.  We must not return
3117         * until all unregister events invoked by the local processor
3118         * have been completed (either by this todo run, or one on
3119         * another cpu).
3120         */
3121        if (list_empty(&net_todo_list))
3122                goto out;
3123
3124        /* Snapshot list, allow later requests */
3125        spin_lock(&net_todo_list_lock);
3126        list_replace_init(&net_todo_list, &list);
3127        spin_unlock(&net_todo_list_lock);
3128
3129        while (!list_empty(&list)) {
3130                struct net_device *dev
3131                        = list_entry(list.next, struct net_device, todo_list);
3132                list_del(&dev->todo_list);
3133
3134                if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
3135                        printk(KERN_ERR "network todo '%s' but state %d\n",
3136                               dev->name, dev->reg_state);
3137                        dump_stack();
3138                        continue;
3139                }
3140
3141                netdev_unregister_sysfs(dev);
3142                dev->reg_state = NETREG_UNREGISTERED;
3143
3144                netdev_wait_allrefs(dev);
3145
3146                /* paranoia */
3147                BUG_ON(atomic_read(&dev->refcnt));
3148                BUG_TRAP(!dev->ip_ptr);
3149                BUG_TRAP(!dev->ip6_ptr);
3150                BUG_TRAP(!dev->dn_ptr);
3151
3152                /* It must be the very last action,
3153                 * after this 'dev' may point to freed up memory.
3154                 */
3155                if (dev->destructor)
3156                        dev->destructor(dev);
3157        }
3158
3159out:
3160        mutex_unlock(&net_todo_run_mutex);
3161}
3162
3163/**
3164 *      alloc_netdev - allocate network device
3165 *      @sizeof_priv:   size of private data to allocate space for
3166 *      @name:          device name format string
3167 *      @setup:         callback to initialize device
3168 *
3169 *      Allocates a struct net_device with private data area for driver use
3170 *      and performs basic initialization.
3171 */
3172struct net_device *alloc_netdev(int sizeof_priv, const char *name,
3173                void (*setup)(struct net_device *))
3174{
3175        void *p;
3176        struct net_device *dev;
3177        int alloc_size;
3178
3179        BUG_ON(strlen(name) >= sizeof(dev->name));
3180
3181        /* ensure 32-byte alignment of both the device and private area */
3182        alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
3183        alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
3184
3185        p = kzalloc(alloc_size, GFP_KERNEL);
3186        if (!p) {
3187                printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
3188                return NULL;
3189        }
3190
3191        dev = (struct net_device *)
3192                (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
3193        dev->padded = (char *)dev - (char *)p;
3194
3195        if (sizeof_priv)
3196                dev->priv = netdev_priv(dev);
3197
3198        setup(dev);
3199        strcpy(dev->name, name);
3200        return dev;
3201}
3202EXPORT_SYMBOL(alloc_netdev);
3203
3204/**
3205 *      free_netdev - free network device
3206 *      @dev: device
3207 *
3208 *      This function does the last stage of destroying an allocated device 
3209 *      interface. The reference to the device object is released.  
3210 *      If this is the last reference then it will be freed.
3211 */
3212void free_netdev(struct net_device *dev)
3213{
3214#ifdef CONFIG_SYSFS
3215        /*  Compatibility with error handling in drivers */
3216        if (dev->reg_state == NETREG_UNINITIALIZED) {
3217                kfree((char *)dev - dev->padded);
3218                return;
3219        }
3220
3221        BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3222        dev->reg_state = NETREG_RELEASED;
3223
3224        /* will free via class release */
3225        class_device_put(&dev->class_dev);
3226#else
3227        kfree((char *)dev - dev->padded);
3228#endif
3229}
3230 
3231/* Synchronize with packet receive processing. */
3232void synchronize_net(void) 
3233{
3234        might_sleep();
3235        synchronize_rcu();
3236}
3237
3238/**
3239 *      unregister_netdevice - remove device from the kernel
3240 *      @dev: device
3241 *
3242 *      This function shuts down a device interface and removes it
3243 *      from the kernel tables. On success 0 is returned, on a failure
3244 *      a negative errno code is returned.
3245 *
3246 *      Callers must hold the rtnl semaphore.  You may want
3247 *      unregister_netdev() instead of this.
3248 */
3249
3250int unregister_netdevice(struct net_device *dev)
3251{
3252        struct net_device *d, **dp;
3253
3254        BUG_ON(dev_boot_phase);
3255        ASSERT_RTNL();
3256
3257        /* Some devices call without registering for initialization unwind. */
3258        if (dev->reg_state == NETREG_UNINITIALIZED) {
3259                printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3260                                  "was registered\n", dev->name, dev);
3261                return -ENODEV;
3262        }
3263
3264        BUG_ON(dev->reg_state != NETREG_REGISTERED);
3265
3266        /* If device is running, close it first. */
3267        if (dev->flags & IFF_UP)
3268                dev_close(dev);
3269
3270        /* And unlink it from device chain. */
3271        for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
3272                if (d == dev) {
3273                        write_lock_bh(&dev_base_lock);
3274                        hlist_del(&dev->name_hlist);
3275                        hlist_del(&dev->index_hlist);
3276                        if (dev_tail == &dev->next)
3277                                dev_tail = dp;
3278                        *dp = d->next;
3279                        write_unlock_bh(&dev_base_lock);
3280                        break;
3281                }
3282        }
3283        if (!d) {
3284                printk(KERN_ERR "unregister net_device: '%s' not found\n",
3285                       dev->name);
3286                return -ENODEV;
3287        }
3288
3289        dev->reg_state = NETREG_UNREGISTERING;
3290
3291        synchronize_net();
3292
3293        /* Shutdown queueing discipline. */
3294        dev_shutdown(dev);
3295
3296        
3297        /* Notify protocols, that we are about to destroy
3298           this device. They should clean all the things.
3299        */
3300        raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
3301        
3302        /*
3303         *      Flush the multicast chain
3304         */
3305        dev_mc_discard(dev);
3306
3307        if (dev->uninit)
3308                dev->uninit(dev);
3309
3310        /* Notifier chain MUST detach us from master device. */
3311        BUG_TRAP(!dev->master);
3312
3313        /* Finish processing unregister after unlock */
3314        net_set_todo(dev);
3315
3316        synchronize_net();
3317
3318        dev_put(dev);
3319        return 0;
3320}
3321
3322/**
3323 *      unregister_netdev - remove device from the kernel
3324 *      @dev: device
3325 *
3326 *      This function shuts down a device interface and removes it
3327 *      from the kernel tables. On success 0 is returned, on a failure
3328 *      a negative errno code is returned.
3329 *
3330 *      This is just a wrapper for unregister_netdevice that takes
3331 *      the rtnl semaphore.  In general you want to use this and not
3332 *      unregister_netdevice.
3333 */
3334void unregister_netdev(struct net_device *dev)
3335{
3336        rtnl_lock();
3337        unregister_netdevice(dev);
3338        rtnl_unlock();
3339}
3340
3341EXPORT_SYMBOL(unregister_netdev);
3342
3343static int dev_cpu_callback(struct notifier_block *nfb,
3344                            unsigned long action,
3345                            void *ocpu)
3346{
3347        struct sk_buff **list_skb;
3348        struct net_device **list_net;
3349        struct sk_buff *skb;
3350        unsigned int cpu, oldcpu = (unsigned long)ocpu;
3351        struct softnet_data *sd, *oldsd;
3352
3353        if (action != CPU_DEAD)
3354                return NOTIFY_OK;
3355
3356        local_irq_disable();
3357        cpu = smp_processor_id();
3358        sd = &per_cpu(softnet_data, cpu);
3359        oldsd = &per_cpu(softnet_data, oldcpu);
3360
3361        /* Find end of our completion_queue. */
3362        list_skb = &sd->completion_queue;
3363        while (*list_skb)
3364                list_skb = &(*list_skb)->next;
3365        /* Append completion queue from offline CPU. */
3366        *list_skb = oldsd->completion_queue;
3367        oldsd->completion_queue = NULL;
3368
3369        /* Find end of our output_queue. */
3370        list_net = &sd->output_queue;
3371        while (*list_net)
3372                list_net = &(*list_net)->next_sched;
3373        /* Append output queue from offline CPU. */
3374        *list_net = oldsd->output_queue;
3375        oldsd->output_queue = NULL;
3376
3377        raise_softirq_irqoff(NET_TX_SOFTIRQ);
3378        local_irq_enable();
3379
3380        /* Process offline CPU's input_pkt_queue */
3381        while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
3382                netif_rx(skb);
3383
3384        return NOTIFY_OK;
3385}
3386
3387#ifdef CONFIG_NET_DMA
3388/**
3389 * net_dma_rebalance -
3390 * This is called when the number of channels allocated to the net_dma_client
3391 * changes.  The net_dma_client tries to have one DMA channel per CPU.
3392 */
3393static void net_dma_rebalance(void)
3394{
3395        unsigned int cpu, i, n;
3396        struct dma_chan *chan;
3397
3398        if (net_dma_count == 0) {
3399                for_each_online_cpu(cpu)
3400                        rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
3401                return;
3402        }
3403
3404        i = 0;
3405        cpu = first_cpu(cpu_online_map);
3406
3407        rcu_read_lock();
3408        list_for_each_entry(chan, &net_dma_client->channels, client_node) {
3409                n = ((num_online_cpus() / net_dma_count)
3410                   + (i < (num_online_cpus() % net_dma_count) ? 1 : 0));
3411
3412                while(n) {
3413                        per_cpu(softnet_data, cpu).net_dma = chan;
3414                        cpu = next_cpu(cpu, cpu_online_map);
3415                        n--;
3416                }
3417                i++;
3418        }
3419        rcu_read_unlock();
3420}
3421
3422/**
3423 * netdev_dma_event - event callback for the net_dma_client
3424 * @client: should always be net_dma_client
3425 * @chan: DMA channel for the event
3426 * @event: event type
3427 */
3428static void netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
3429        enum dma_event event)
3430{
3431        spin_lock(&net_dma_event_lock);
3432        switch (event) {
3433        case DMA_RESOURCE_ADDED:
3434                net_dma_count++;
3435                net_dma_rebalance();
3436                break;
3437        case DMA_RESOURCE_REMOVED:
3438                net_dma_count--;
3439                net_dma_rebalance();
3440                break;
3441        default:
3442                break;
3443        }
3444        spin_unlock(&net_dma_event_lock);
3445}
3446
3447/**
3448 * netdev_dma_regiser - register the networking subsystem as a DMA client
3449 */
3450static int __init netdev_dma_register(void)
3451{
3452        spin_lock_init(&net_dma_event_lock);
3453        net_dma_client = dma_async_client_register(netdev_dma_event);
3454        if (net_dma_client == NULL)
3455                return -ENOMEM;
3456
3457        dma_async_client_chan_request(net_dma_client, num_online_cpus());
3458        return 0;
3459}
3460
3461#else
3462static int __init netdev_dma_register(void) { return -ENODEV; }
3463#endif /* CONFIG_NET_DMA */
3464
3465/*
3466 *      Initialize the DEV module. At boot time this walks the device list and
3467 *      unhooks any devices that fail to initialise (normally hardware not
3468 *      present) and leaves us with a valid list of present and active devices.
3469 *
3470 */
3471
3472/*
3473 *       This is called single threaded during boot, so no need
3474 *       to take the rtnl semaphore.
3475 */
3476static int __init net_dev_init(void)
3477{
3478        int i, rc = -ENOMEM;
3479
3480        BUG_ON(!dev_boot_phase);
3481
3482        if (dev_proc_init())
3483                goto out;
3484
3485        if (netdev_sysfs_init())
3486                goto out;
3487
3488        INIT_LIST_HEAD(&ptype_all);
3489        for (i = 0; i < 16; i++) 
3490                INIT_LIST_HEAD(&ptype_base[i]);
3491
3492        for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
3493                INIT_HLIST_HEAD(&dev_name_head[i]);
3494
3495        for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
3496                INIT_HLIST_HEAD(&dev_index_head[i]);
3497
3498        /*
3499         *      Initialise the packet receive queues.
3500         */
3501
3502        for_each_possible_cpu(i) {
3503                struct softnet_data *queue;
3504
3505                queue = &per_cpu(softnet_data, i);
3506                skb_queue_head_init(&queue->input_pkt_queue);
3507                queue->completion_queue = NULL;
3508                INIT_LIST_HEAD(&queue->poll_list);
3509                set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
3510                queue->backlog_dev.weight = weight_p;
3511                queue->backlog_dev.poll = process_backlog;
3512                atomic_set(&queue->backlog_dev.refcnt, 1);
3513        }
3514
3515        netdev_dma_register();
3516
3517        dev_boot_phase = 0;
3518
3519        open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
3520        open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
3521
3522        hotcpu_notifier(dev_cpu_callback, 0);
3523        dst_init();
3524        dev_mcast_init();
3525        rc = 0;
3526out:
3527        return rc;
3528}
3529
3530subsys_initcall(net_dev_init);
3531
3532EXPORT_SYMBOL(__dev_get_by_index);
3533EXPORT_SYMBOL(__dev_get_by_name);
3534EXPORT_SYMBOL(__dev_remove_pack);
3535EXPORT_SYMBOL(dev_valid_name);
3536EXPORT_SYMBOL(dev_add_pack);
3537EXPORT_SYMBOL(dev_alloc_name);
3538EXPORT_SYMBOL(dev_close);
3539EXPORT_SYMBOL(dev_get_by_flags);
3540EXPORT_SYMBOL(dev_get_by_index);
3541EXPORT_SYMBOL(dev_get_by_name);
3542EXPORT_SYMBOL(dev_open);
3543EXPORT_SYMBOL(dev_queue_xmit);
3544EXPORT_SYMBOL(dev_remove_pack);
3545EXPORT_SYMBOL(dev_set_allmulti);
3546EXPORT_SYMBOL(dev_set_promiscuity);
3547EXPORT_SYMBOL(dev_change_flags);
3548EXPORT_SYMBOL(dev_set_mtu);
3549EXPORT_SYMBOL(dev_set_mac_address);
3550EXPORT_SYMBOL(free_netdev);
3551EXPORT_SYMBOL(netdev_boot_setup_check);
3552EXPORT_SYMBOL(netdev_set_master);
3553EXPORT_SYMBOL(netdev_state_change);
3554EXPORT_SYMBOL(netif_receive_skb);
3555EXPORT_SYMBOL(netif_rx);
3556EXPORT_SYMBOL(register_gifconf);
3557EXPORT_SYMBOL(register_netdevice);
3558EXPORT_SYMBOL(register_netdevice_notifier);
3559EXPORT_SYMBOL(skb_checksum_help);
3560EXPORT_SYMBOL(synchronize_net);
3561EXPORT_SYMBOL(unregister_netdevice);
3562EXPORT_SYMBOL(unregister_netdevice_notifier);
3563EXPORT_SYMBOL(net_enable_timestamp);
3564EXPORT_SYMBOL(net_disable_timestamp);
3565EXPORT_SYMBOL(dev_get_flags);
3566
3567#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3568EXPORT_SYMBOL(br_handle_frame_hook);
3569EXPORT_SYMBOL(br_fdb_get_hook);
3570EXPORT_SYMBOL(br_fdb_put_hook);
3571#endif
3572
3573#ifdef CONFIG_KMOD
3574EXPORT_SYMBOL(dev_load);
3575#endif
3576
3577EXPORT_PER_CPU_SYMBOL(softnet_data);
3578
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