(no commit message)

[linux-2.6.git] / linux-2.6-710-disable-vserver-check-for-ns-devices.patch

diff -Nurb linux-2.6.27.10-clickport/net/core/dev.c trellis2/net/core/dev.c
--- linux-2.6.27.10-clickport/net/core/dev.c    2009-01-27 16:02:45.000000000 -0500
+++ trellis2/net/core/dev.c     2009-02-12 11:00:46.000000000 -0500
@@ -2559,7 +2559,7 @@
 
        total = 0;
        for_each_netdev(net, dev) {
-               if (!nx_dev_visible(current->nx_info, dev))
+               if (net==&init_dev && !nx_dev_visible(current->nx_info, dev))
                        continue;
                for (i = 0; i < NPROTO; i++) {
                        if (gifconf_list[i]) {
@@ -2628,8 +2628,9 @@
 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
 {
        struct net_device_stats *stats = dev->get_stats(dev);
+    struct net *net = seq->private;
 
-       if (!nx_dev_visible(current->nx_info, dev))
+       if (net==&init_net && !nx_dev_visible(current->nx_info, dev))
                return;
 
        seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
diff -Nurb linux-2.6.27.10-clickport/net/core/dev.c.orig trellis2/net/core/dev.c.orig
--- linux-2.6.27.10-clickport/net/core/dev.c.orig       1969-12-31 19:00:00.000000000 -0500
+++ trellis2/net/core/dev.c.orig        2009-01-27 16:02:45.000000000 -0500
@@ -0,0 +1,4951 @@
+/*
+ *     NET3    Protocol independent device support routines.
+ *
+ *             This program is free software; you can redistribute it and/or
+ *             modify it under the terms of the GNU General Public License
+ *             as published by the Free Software Foundation; either version
+ *             2 of the License, or (at your option) any later version.
+ *
+ *     Derived from the non IP parts of dev.c 1.0.19
+ *             Authors:        Ross Biro
+ *                             Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *                             Mark Evans, <evansmp@uhura.aston.ac.uk>
+ *
+ *     Additional Authors:
+ *             Florian la Roche <rzsfl@rz.uni-sb.de>
+ *             Alan Cox <gw4pts@gw4pts.ampr.org>
+ *             David Hinds <dahinds@users.sourceforge.net>
+ *             Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ *             Adam Sulmicki <adam@cfar.umd.edu>
+ *              Pekka Riikonen <priikone@poesidon.pspt.fi>
+ *
+ *     Changes:
+ *              D.J. Barrow     :       Fixed bug where dev->refcnt gets set
+ *                                     to 2 if register_netdev gets called
+ *                                     before net_dev_init & also removed a
+ *                                     few lines of code in the process.
+ *             Alan Cox        :       device private ioctl copies fields back.
+ *             Alan Cox        :       Transmit queue code does relevant
+ *                                     stunts to keep the queue safe.
+ *             Alan Cox        :       Fixed double lock.
+ *             Alan Cox        :       Fixed promisc NULL pointer trap
+ *             ????????        :       Support the full private ioctl range
+ *             Alan Cox        :       Moved ioctl permission check into
+ *                                     drivers
+ *             Tim Kordas      :       SIOCADDMULTI/SIOCDELMULTI
+ *             Alan Cox        :       100 backlog just doesn't cut it when
+ *                                     you start doing multicast video 8)
+ *             Alan Cox        :       Rewrote net_bh and list manager.
+ *             Alan Cox        :       Fix ETH_P_ALL echoback lengths.
+ *             Alan Cox        :       Took out transmit every packet pass
+ *                                     Saved a few bytes in the ioctl handler
+ *             Alan Cox        :       Network driver sets packet type before
+ *                                     calling netif_rx. Saves a function
+ *                                     call a packet.
+ *             Alan Cox        :       Hashed net_bh()
+ *             Richard Kooijman:       Timestamp fixes.
+ *             Alan Cox        :       Wrong field in SIOCGIFDSTADDR
+ *             Alan Cox        :       Device lock protection.
+ *             Alan Cox        :       Fixed nasty side effect of device close
+ *                                     changes.
+ *             Rudi Cilibrasi  :       Pass the right thing to
+ *                                     set_mac_address()
+ *             Dave Miller     :       32bit quantity for the device lock to
+ *                                     make it work out on a Sparc.
+ *             Bjorn Ekwall    :       Added KERNELD hack.
+ *             Alan Cox        :       Cleaned up the backlog initialise.
+ *             Craig Metz      :       SIOCGIFCONF fix if space for under
+ *                                     1 device.
+ *         Thomas Bogendoerfer :       Return ENODEV for dev_open, if there
+ *                                     is no device open function.
+ *             Andi Kleen      :       Fix error reporting for SIOCGIFCONF
+ *         Michael Chastain    :       Fix signed/unsigned for SIOCGIFCONF
+ *             Cyrus Durgin    :       Cleaned for KMOD
+ *             Adam Sulmicki   :       Bug Fix : Network Device Unload
+ *                                     A network device unload needs to purge
+ *                                     the backlog queue.
+ *     Paul Rusty Russell      :       SIOCSIFNAME
+ *              Pekka Riikonen  :      Netdev boot-time settings code
+ *              Andrew Morton   :       Make unregister_netdevice wait
+ *                                     indefinitely on dev->refcnt
+ *             J Hadi Salim    :       - Backlog queue sampling
+ *                                     - netif_rx() feedback
+ */
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/bitops.h>
+#include <linux/capability.h>
+#include <linux/cpu.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mutex.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/notifier.h>
+#include <linux/skbuff.h>
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+#include <linux/if_bridge.h>
+#include <linux/if_macvlan.h>
+#include <net/dst.h>
+#include <net/pkt_sched.h>
+#include <net/checksum.h>
+#include <linux/highmem.h>
+#include <linux/init.h>
+#include <linux/kmod.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/netpoll.h>
+#include <linux/rcupdate.h>
+#include <linux/delay.h>
+#include <net/wext.h>
+#include <net/iw_handler.h>
+#include <asm/current.h>
+#include <linux/audit.h>
+#include <linux/dmaengine.h>
+#include <linux/err.h>
+#include <linux/ctype.h>
+#include <linux/if_arp.h>
+#include <linux/if_vlan.h>
+#include <linux/ip.h>
+#include <net/ip.h>
+#include <linux/ipv6.h>
+#include <linux/in.h>
+#include <linux/jhash.h>
+#include <linux/random.h>
+#include <linux/vs_inet.h>
+
+#include "net-sysfs.h"
+
+/*
+ *     The list of packet types we will receive (as opposed to discard)
+ *     and the routines to invoke.
+ *
+ *     Why 16. Because with 16 the only overlap we get on a hash of the
+ *     low nibble of the protocol value is RARP/SNAP/X.25.
+ *
+ *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
+ *             sure which should go first, but I bet it won't make much
+ *             difference if we are running VLANs.  The good news is that
+ *             this protocol won't be in the list unless compiled in, so
+ *             the average user (w/out VLANs) will not be adversely affected.
+ *             --BLG
+ *
+ *             0800    IP
+ *             8100    802.1Q VLAN
+ *             0001    802.3
+ *             0002    AX.25
+ *             0004    802.2
+ *             8035    RARP
+ *             0005    SNAP
+ *             0805    X.25
+ *             0806    ARP
+ *             8137    IPX
+ *             0009    Localtalk
+ *             86DD    IPv6
+ */
+
+#define PTYPE_HASH_SIZE        (16)
+#define PTYPE_HASH_MASK        (PTYPE_HASH_SIZE - 1)
+
+static DEFINE_SPINLOCK(ptype_lock);
+static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
+static struct list_head ptype_all __read_mostly;       /* Taps */
+
+#ifdef CONFIG_NET_DMA
+struct net_dma {
+       struct dma_client client;
+       spinlock_t lock;
+       cpumask_t channel_mask;
+       struct dma_chan **channels;
+};
+
+static enum dma_state_client
+netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
+       enum dma_state state);
+
+static struct net_dma net_dma = {
+       .client = {
+               .event_callback = netdev_dma_event,
+       },
+};
+#endif
+
+/*
+ * The @dev_base_head list is protected by @dev_base_lock and the rtnl
+ * semaphore.
+ *
+ * Pure readers hold dev_base_lock for reading.
+ *
+ * Writers must hold the rtnl semaphore while they loop through the
+ * dev_base_head list, and hold dev_base_lock for writing when they do the
+ * actual updates.  This allows pure readers to access the list even
+ * while a writer is preparing to update it.
+ *
+ * To put it another way, dev_base_lock is held for writing only to
+ * protect against pure readers; the rtnl semaphore provides the
+ * protection against other writers.
+ *
+ * See, for example usages, register_netdevice() and
+ * unregister_netdevice(), which must be called with the rtnl
+ * semaphore held.
+ */
+DEFINE_RWLOCK(dev_base_lock);
+
+EXPORT_SYMBOL(dev_base_lock);
+
+#define NETDEV_HASHBITS        8
+#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
+
+static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
+{
+       unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
+       return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
+}
+
+static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
+{
+       return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
+}
+
+/* Device list insertion */
+static int list_netdevice(struct net_device *dev)
+{
+       struct net *net = dev_net(dev);
+
+       ASSERT_RTNL();
+
+       write_lock_bh(&dev_base_lock);
+       list_add_tail(&dev->dev_list, &net->dev_base_head);
+       hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
+       hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
+       write_unlock_bh(&dev_base_lock);
+       return 0;
+}
+
+/* Device list removal */
+static void unlist_netdevice(struct net_device *dev)
+{
+       ASSERT_RTNL();
+
+       /* Unlink dev from the device chain */
+       write_lock_bh(&dev_base_lock);
+       list_del(&dev->dev_list);
+       hlist_del(&dev->name_hlist);
+       hlist_del(&dev->index_hlist);
+       write_unlock_bh(&dev_base_lock);
+}
+
+/* Click: input packet handlers, might steal packets from net_rx_action. */
+static RAW_NOTIFIER_HEAD(net_in_chain);
+
+/*
+ *     Our notifier list
+ */
+
+static RAW_NOTIFIER_HEAD(netdev_chain);
+
+/*
+ *     Device drivers call our routines to queue packets here. We empty the
+ *     queue in the local softnet handler.
+ */
+
+DEFINE_PER_CPU(struct softnet_data, softnet_data);
+
+#ifdef CONFIG_LOCKDEP
+/*
+ * register_netdevice() inits txq->_xmit_lock and sets lockdep class
+ * according to dev->type
+ */
+static const unsigned short netdev_lock_type[] =
+       {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
+        ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
+        ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
+        ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
+        ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
+        ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
+        ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
+        ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
+        ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
+        ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
+        ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
+        ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
+        ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
+        ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID,
+        ARPHRD_NONE};
+
+static const char *netdev_lock_name[] =
+       {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
+        "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
+        "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
+        "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
+        "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
+        "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
+        "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
+        "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
+        "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
+        "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
+        "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
+        "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
+        "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
+        "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID",
+        "_xmit_NONE"};
+
+static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
+static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
+
+static inline unsigned short netdev_lock_pos(unsigned short dev_type)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
+               if (netdev_lock_type[i] == dev_type)
+                       return i;
+       /* the last key is used by default */
+       return ARRAY_SIZE(netdev_lock_type) - 1;
+}
+
+static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
+                                                unsigned short dev_type)
+{
+       int i;
+
+       i = netdev_lock_pos(dev_type);
+       lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
+                                  netdev_lock_name[i]);
+}
+
+static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
+{
+       int i;
+
+       i = netdev_lock_pos(dev->type);
+       lockdep_set_class_and_name(&dev->addr_list_lock,
+                                  &netdev_addr_lock_key[i],
+                                  netdev_lock_name[i]);
+}
+#else
+static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
+                                                unsigned short dev_type)
+{
+}
+static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
+{
+}
+#endif
+
+/*******************************************************************************
+
+               Protocol management and registration routines
+
+*******************************************************************************/
+
+/*
+ *     Add a protocol ID to the list. Now that the input handler is
+ *     smarter we can dispense with all the messy stuff that used to be
+ *     here.
+ *
+ *     BEWARE!!! Protocol handlers, mangling input packets,
+ *     MUST BE last in hash buckets and checking protocol handlers
+ *     MUST start from promiscuous ptype_all chain in net_bh.
+ *     It is true now, do not change it.
+ *     Explanation follows: if protocol handler, mangling packet, will
+ *     be the first on list, it is not able to sense, that packet
+ *     is cloned and should be copied-on-write, so that it will
+ *     change it and subsequent readers will get broken packet.
+ *                                                     --ANK (980803)
+ */
+
+/**
+ *     dev_add_pack - add packet handler
+ *     @pt: packet type declaration
+ *
+ *     Add a protocol handler to the networking stack. The passed &packet_type
+ *     is linked into kernel lists and may not be freed until it has been
+ *     removed from the kernel lists.
+ *
+ *     This call does not sleep therefore it can not
+ *     guarantee all CPU's that are in middle of receiving packets
+ *     will see the new packet type (until the next received packet).
+ */
+
+void dev_add_pack(struct packet_type *pt)
+{
+       int hash;
+
+       spin_lock_bh(&ptype_lock);
+       if (pt->type == htons(ETH_P_ALL))
+               list_add_rcu(&pt->list, &ptype_all);
+       else {
+               hash = ntohs(pt->type) & PTYPE_HASH_MASK;
+               list_add_rcu(&pt->list, &ptype_base[hash]);
+       }
+       spin_unlock_bh(&ptype_lock);
+}
+
+/**
+ *     __dev_remove_pack        - remove packet handler
+ *     @pt: packet type declaration
+ *
+ *     Remove a protocol handler that was previously added to the kernel
+ *     protocol handlers by dev_add_pack(). The passed &packet_type is removed
+ *     from the kernel lists and can be freed or reused once this function
+ *     returns.
+ *
+ *      The packet type might still be in use by receivers
+ *     and must not be freed until after all the CPU's have gone
+ *     through a quiescent state.
+ */
+void __dev_remove_pack(struct packet_type *pt)
+{
+       struct list_head *head;
+       struct packet_type *pt1;
+
+       spin_lock_bh(&ptype_lock);
+
+       if (pt->type == htons(ETH_P_ALL))
+               head = &ptype_all;
+       else
+               head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
+
+       list_for_each_entry(pt1, head, list) {
+               if (pt == pt1) {
+                       list_del_rcu(&pt->list);
+                       goto out;
+               }
+       }
+
+       printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
+out:
+       spin_unlock_bh(&ptype_lock);
+}
+/**
+ *     dev_remove_pack  - remove packet handler
+ *     @pt: packet type declaration
+ *
+ *     Remove a protocol handler that was previously added to the kernel
+ *     protocol handlers by dev_add_pack(). The passed &packet_type is removed
+ *     from the kernel lists and can be freed or reused once this function
+ *     returns.
+ *
+ *     This call sleeps to guarantee that no CPU is looking at the packet
+ *     type after return.
+ */
+void dev_remove_pack(struct packet_type *pt)
+{
+       __dev_remove_pack(pt);
+
+       synchronize_net();
+}
+
+/******************************************************************************
+
+                     Device Boot-time Settings Routines
+
+*******************************************************************************/
+
+/* Boot time configuration table */
+static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
+
+/**
+ *     netdev_boot_setup_add   - add new setup entry
+ *     @name: name of the device
+ *     @map: configured settings for the device
+ *
+ *     Adds new setup entry to the dev_boot_setup list.  The function
+ *     returns 0 on error and 1 on success.  This is a generic routine to
+ *     all netdevices.
+ */
+static int netdev_boot_setup_add(char *name, struct ifmap *map)
+{
+       struct netdev_boot_setup *s;
+       int i;
+
+       s = dev_boot_setup;
+       for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
+               if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
+                       memset(s[i].name, 0, sizeof(s[i].name));
+                       strlcpy(s[i].name, name, IFNAMSIZ);
+                       memcpy(&s[i].map, map, sizeof(s[i].map));
+                       break;
+               }
+       }
+
+       return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
+}
+
+/**
+ *     netdev_boot_setup_check - check boot time settings
+ *     @dev: the netdevice
+ *
+ *     Check boot time settings for the device.
+ *     The found settings are set for the device to be used
+ *     later in the device probing.
+ *     Returns 0 if no settings found, 1 if they are.
+ */
+int netdev_boot_setup_check(struct net_device *dev)
+{
+       struct netdev_boot_setup *s = dev_boot_setup;
+       int i;
+
+       for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
+               if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
+                   !strcmp(dev->name, s[i].name)) {
+                       dev->irq        = s[i].map.irq;
+                       dev->base_addr  = s[i].map.base_addr;
+                       dev->mem_start  = s[i].map.mem_start;
+                       dev->mem_end    = s[i].map.mem_end;
+                       return 1;
+               }
+       }
+       return 0;
+}
+
+
+/**
+ *     netdev_boot_base        - get address from boot time settings
+ *     @prefix: prefix for network device
+ *     @unit: id for network device
+ *
+ *     Check boot time settings for the base address of device.
+ *     The found settings are set for the device to be used
+ *     later in the device probing.
+ *     Returns 0 if no settings found.
+ */
+unsigned long netdev_boot_base(const char *prefix, int unit)
+{
+       const struct netdev_boot_setup *s = dev_boot_setup;
+       char name[IFNAMSIZ];
+       int i;
+
+       sprintf(name, "%s%d", prefix, unit);
+
+       /*
+        * If device already registered then return base of 1
+        * to indicate not to probe for this interface
+        */
+       if (__dev_get_by_name(&init_net, name))
+               return 1;
+
+       for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
+               if (!strcmp(name, s[i].name))
+                       return s[i].map.base_addr;
+       return 0;
+}
+
+/*
+ * Saves at boot time configured settings for any netdevice.
+ */
+int __init netdev_boot_setup(char *str)
+{
+       int ints[5];
+       struct ifmap map;
+
+       str = get_options(str, ARRAY_SIZE(ints), ints);
+       if (!str || !*str)
+               return 0;
+
+       /* Save settings */
+       memset(&map, 0, sizeof(map));
+       if (ints[0] > 0)
+               map.irq = ints[1];
+       if (ints[0] > 1)
+               map.base_addr = ints[2];
+       if (ints[0] > 2)
+               map.mem_start = ints[3];
+       if (ints[0] > 3)
+               map.mem_end = ints[4];
+
+       /* Add new entry to the list */
+       return netdev_boot_setup_add(str, &map);
+}
+
+__setup("netdev=", netdev_boot_setup);
+
+/*******************************************************************************
+
+                           Device Interface Subroutines
+
+*******************************************************************************/
+
+/**
+ *     __dev_get_by_name       - find a device by its name
+ *     @net: the applicable net namespace
+ *     @name: name to find
+ *
+ *     Find an interface by name. Must be called under RTNL semaphore
+ *     or @dev_base_lock. If the name is found a pointer to the device
+ *     is returned. If the name is not found then %NULL is returned. The
+ *     reference counters are not incremented so the caller must be
+ *     careful with locks.
+ */
+
+struct net_device *__dev_get_by_name(struct net *net, const char *name)
+{
+       struct hlist_node *p;
+
+       hlist_for_each(p, dev_name_hash(net, name)) {
+               struct net_device *dev
+                       = hlist_entry(p, struct net_device, name_hlist);
+               if (!strncmp(dev->name, name, IFNAMSIZ))
+                       return dev;
+       }
+       return NULL;
+}
+
+/**
+ *     dev_get_by_name         - find a device by its name
+ *     @net: the applicable net namespace
+ *     @name: name to find
+ *
+ *     Find an interface by name. This can be called from any
+ *     context and does its own locking. The returned handle has
+ *     the usage count incremented and the caller must use dev_put() to
+ *     release it when it is no longer needed. %NULL is returned if no
+ *     matching device is found.
+ */
+
+struct net_device *dev_get_by_name(struct net *net, const char *name)
+{
+       struct net_device *dev;
+
+       read_lock(&dev_base_lock);
+       dev = __dev_get_by_name(net, name);
+       if (dev)
+               dev_hold(dev);
+       read_unlock(&dev_base_lock);
+       return dev;
+}
+
+/**
+ *     __dev_get_by_index - find a device by its ifindex
+ *     @net: the applicable net namespace
+ *     @ifindex: index of device
+ *
+ *     Search for an interface by index. Returns %NULL if the device
+ *     is not found or a pointer to the device. The device has not
+ *     had its reference counter increased so the caller must be careful
+ *     about locking. The caller must hold either the RTNL semaphore
+ *     or @dev_base_lock.
+ */
+
+struct net_device *__dev_get_by_index(struct net *net, int ifindex)
+{
+       struct hlist_node *p;
+
+       hlist_for_each(p, dev_index_hash(net, ifindex)) {
+               struct net_device *dev
+                       = hlist_entry(p, struct net_device, index_hlist);
+               if (dev->ifindex == ifindex)
+                       return dev;
+       }
+       return NULL;
+}
+
+
+/**
+ *     dev_get_by_index - find a device by its ifindex
+ *     @net: the applicable net namespace
+ *     @ifindex: index of device
+ *
+ *     Search for an interface by index. Returns NULL if the device
+ *     is not found or a pointer to the device. The device returned has
+ *     had a reference added and the pointer is safe until the user calls
+ *     dev_put to indicate they have finished with it.
+ */
+
+struct net_device *dev_get_by_index(struct net *net, int ifindex)
+{
+       struct net_device *dev;
+
+       read_lock(&dev_base_lock);
+       dev = __dev_get_by_index(net, ifindex);
+       if (dev)
+               dev_hold(dev);
+       read_unlock(&dev_base_lock);
+       return dev;
+}
+
+/**
+ *     dev_getbyhwaddr - find a device by its hardware address
+ *     @net: the applicable net namespace
+ *     @type: media type of device
+ *     @ha: hardware address
+ *
+ *     Search for an interface by MAC address. Returns NULL if the device
+ *     is not found or a pointer to the device. The caller must hold the
+ *     rtnl semaphore. The returned device has not had its ref count increased
+ *     and the caller must therefore be careful about locking
+ *
+ *     BUGS:
+ *     If the API was consistent this would be __dev_get_by_hwaddr
+ */
+
+struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
+{
+       struct net_device *dev;
+
+       ASSERT_RTNL();
+
+       for_each_netdev(net, dev)
+               if (dev->type == type &&
+                   !memcmp(dev->dev_addr, ha, dev->addr_len))
+                       return dev;
+
+       return NULL;
+}
+
+EXPORT_SYMBOL(dev_getbyhwaddr);
+
+struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
+{
+       struct net_device *dev;
+
+       ASSERT_RTNL();
+       for_each_netdev(net, dev)
+               if (dev->type == type)
+                       return dev;
+
+       return NULL;
+}
+
+EXPORT_SYMBOL(__dev_getfirstbyhwtype);
+
+struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
+{
+       struct net_device *dev;
+
+       rtnl_lock();
+       dev = __dev_getfirstbyhwtype(net, type);
+       if (dev)
+               dev_hold(dev);
+       rtnl_unlock();
+       return dev;
+}
+
+EXPORT_SYMBOL(dev_getfirstbyhwtype);
+
+/**
+ *     dev_get_by_flags - find any device with given flags
+ *     @net: the applicable net namespace
+ *     @if_flags: IFF_* values
+ *     @mask: bitmask of bits in if_flags to check
+ *
+ *     Search for any interface with the given flags. Returns NULL if a device
+ *     is not found or a pointer to the device. The device returned has
+ *     had a reference added and the pointer is safe until the user calls
+ *     dev_put to indicate they have finished with it.
+ */
+
+struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
+{
+       struct net_device *dev, *ret;
+
+       ret = NULL;
+       read_lock(&dev_base_lock);
+       for_each_netdev(net, dev) {
+               if (((dev->flags ^ if_flags) & mask) == 0) {
+                       dev_hold(dev);
+                       ret = dev;
+                       break;
+               }
+       }
+       read_unlock(&dev_base_lock);
+       return ret;
+}
+
+/**
+ *     dev_valid_name - check if name is okay for network device
+ *     @name: name string
+ *
+ *     Network device names need to be valid file names to
+ *     to allow sysfs to work.  We also disallow any kind of
+ *     whitespace.
+ */
+int dev_valid_name(const char *name)
+{
+       if (*name == '\0')
+               return 0;
+       if (strlen(name) >= IFNAMSIZ)
+               return 0;
+       if (!strcmp(name, ".") || !strcmp(name, ".."))
+               return 0;
+
+       while (*name) {
+               if (*name == '/' || isspace(*name))
+                       return 0;
+               name++;
+       }
+       return 1;
+}
+
+/**
+ *     __dev_alloc_name - allocate a name for a device
+ *     @net: network namespace to allocate the device name in
+ *     @name: name format string
+ *     @buf:  scratch buffer and result name string
+ *
+ *     Passed a format string - eg "lt%d" it will try and find a suitable
+ *     id. It scans list of devices to build up a free map, then chooses
+ *     the first empty slot. The caller must hold the dev_base or rtnl lock
+ *     while allocating the name and adding the device in order to avoid
+ *     duplicates.
+ *     Limited to bits_per_byte * page size devices (ie 32K on most platforms).
+ *     Returns the number of the unit assigned or a negative errno code.
+ */
+
+static int __dev_alloc_name(struct net *net, const char *name, char *buf)
+{
+       int i = 0;
+       const char *p;
+       const int max_netdevices = 8*PAGE_SIZE;
+       unsigned long *inuse;
+       struct net_device *d;
+
+       p = strnchr(name, IFNAMSIZ-1, '%');
+       if (p) {
+               /*
+                * Verify the string as this thing may have come from
+                * the user.  There must be either one "%d" and no other "%"
+                * characters.
+                */
+               if (p[1] != 'd' || strchr(p + 2, '%'))
+                       return -EINVAL;
+
+               /* Use one page as a bit array of possible slots */
+               inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
+               if (!inuse)
+                       return -ENOMEM;
+
+               for_each_netdev(net, d) {
+                       if (!sscanf(d->name, name, &i))
+                               continue;
+                       if (i < 0 || i >= max_netdevices)
+                               continue;
+
+                       /*  avoid cases where sscanf is not exact inverse of printf */
+                       snprintf(buf, IFNAMSIZ, name, i);
+                       if (!strncmp(buf, d->name, IFNAMSIZ))
+                               set_bit(i, inuse);
+               }
+
+               i = find_first_zero_bit(inuse, max_netdevices);
+               free_page((unsigned long) inuse);
+       }
+
+       snprintf(buf, IFNAMSIZ, name, i);
+       if (!__dev_get_by_name(net, buf))
+               return i;
+
+       /* It is possible to run out of possible slots
+        * when the name is long and there isn't enough space left
+        * for the digits, or if all bits are used.
+        */
+       return -ENFILE;
+}
+
+/**
+ *     dev_alloc_name - allocate a name for a device
+ *     @dev: device
+ *     @name: name format string
+ *
+ *     Passed a format string - eg "lt%d" it will try and find a suitable
+ *     id. It scans list of devices to build up a free map, then chooses
+ *     the first empty slot. The caller must hold the dev_base or rtnl lock
+ *     while allocating the name and adding the device in order to avoid
+ *     duplicates.
+ *     Limited to bits_per_byte * page size devices (ie 32K on most platforms).
+ *     Returns the number of the unit assigned or a negative errno code.
+ */
+
+int dev_alloc_name(struct net_device *dev, const char *name)
+{
+       char buf[IFNAMSIZ];
+       struct net *net;
+       int ret;
+
+       BUG_ON(!dev_net(dev));
+       net = dev_net(dev);
+       ret = __dev_alloc_name(net, name, buf);
+       if (ret >= 0)
+               strlcpy(dev->name, buf, IFNAMSIZ);
+       return ret;
+}
+
+
+/**
+ *     dev_change_name - change name of a device
+ *     @dev: device
+ *     @newname: name (or format string) must be at least IFNAMSIZ
+ *
+ *     Change name of a device, can pass format strings "eth%d".
+ *     for wildcarding.
+ */
+int dev_change_name(struct net_device *dev, char *newname)
+{
+       char oldname[IFNAMSIZ];
+       int err = 0;
+       int ret;
+       struct net *net;
+
+       ASSERT_RTNL();
+       BUG_ON(!dev_net(dev));
+
+       net = dev_net(dev);
+       if (dev->flags & IFF_UP)
+               return -EBUSY;
+
+       if (!dev_valid_name(newname))
+               return -EINVAL;
+
+       if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
+               return 0;
+
+       memcpy(oldname, dev->name, IFNAMSIZ);
+
+       if (strchr(newname, '%')) {
+               err = dev_alloc_name(dev, newname);
+               if (err < 0)
+                       return err;
+               strcpy(newname, dev->name);
+       }
+       else if (__dev_get_by_name(net, newname))
+               return -EEXIST;
+       else
+               strlcpy(dev->name, newname, IFNAMSIZ);
+
+rollback:
+       /* For now only devices in the initial network namespace
+        * are in sysfs.
+        */
+       if (net == &init_net) {
+               ret = device_rename(&dev->dev, dev->name);
+               if (ret) {
+                       memcpy(dev->name, oldname, IFNAMSIZ);
+                       return ret;
+               }
+       }
+
+       write_lock_bh(&dev_base_lock);
+       hlist_del(&dev->name_hlist);
+       hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
+       write_unlock_bh(&dev_base_lock);
+
+       ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
+       ret = notifier_to_errno(ret);
+
+       if (ret) {
+               if (err) {
+                       printk(KERN_ERR
+                              "%s: name change rollback failed: %d.\n",
+                              dev->name, ret);
+               } else {
+                       err = ret;
+                       memcpy(dev->name, oldname, IFNAMSIZ);
+                       goto rollback;
+               }
+       }
+
+       return err;
+}
+
+/**
+ *     netdev_features_change - device changes features
+ *     @dev: device to cause notification
+ *
+ *     Called to indicate a device has changed features.
+ */
+void netdev_features_change(struct net_device *dev)
+{
+       call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
+}
+EXPORT_SYMBOL(netdev_features_change);
+
+/**
+ *     netdev_state_change - device changes state
+ *     @dev: device to cause notification
+ *
+ *     Called to indicate a device has changed state. This function calls
+ *     the notifier chains for netdev_chain and sends a NEWLINK message
+ *     to the routing socket.
+ */
+void netdev_state_change(struct net_device *dev)
+{
+       if (dev->flags & IFF_UP) {
+               call_netdevice_notifiers(NETDEV_CHANGE, dev);
+               rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
+       }
+}
+
+void netdev_bonding_change(struct net_device *dev)
+{
+       call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
+}
+EXPORT_SYMBOL(netdev_bonding_change);
+
+/**
+ *     dev_load        - load a network module
+ *     @net: the applicable net namespace
+ *     @name: name of interface
+ *
+ *     If a network interface is not present and the process has suitable
+ *     privileges this function loads the module. If module loading is not
+ *     available in this kernel then it becomes a nop.
+ */
+
+void dev_load(struct net *net, const char *name)
+{
+       struct net_device *dev;
+
+       read_lock(&dev_base_lock);
+       dev = __dev_get_by_name(net, name);
+       read_unlock(&dev_base_lock);
+
+       if (!dev && capable(CAP_SYS_MODULE))
+               request_module("%s", name);
+}
+
+/**
+ *     dev_open        - prepare an interface for use.
+ *     @dev:   device to open
+ *
+ *     Takes a device from down to up state. The device's private open
+ *     function is invoked and then the multicast lists are loaded. Finally
+ *     the device is moved into the up state and a %NETDEV_UP message is
+ *     sent to the netdev notifier chain.
+ *
+ *     Calling this function on an active interface is a nop. On a failure
+ *     a negative errno code is returned.
+ */
+int dev_open(struct net_device *dev)
+{
+       int ret = 0;
+
+       ASSERT_RTNL();
+
+       /*
+        *      Is it already up?
+        */
+
+       if (dev->flags & IFF_UP)
+               return 0;
+
+       /*
+        *      Is it even present?
+        */
+       if (!netif_device_present(dev))
+               return -ENODEV;
+
+       /*
+        *      Call device private open method
+        */
+       set_bit(__LINK_STATE_START, &dev->state);
+
+       if (dev->validate_addr)
+               ret = dev->validate_addr(dev);
+
+       if (!ret && dev->open)
+               ret = dev->open(dev);
+
+       /*
+        *      If it went open OK then:
+        */
+
+       if (ret)
+               clear_bit(__LINK_STATE_START, &dev->state);
+       else {
+               /*
+                *      Set the flags.
+                */
+               dev->flags |= IFF_UP;
+
+               /*
+                *      Initialize multicasting status
+                */
+               dev_set_rx_mode(dev);
+
+               /*
+                *      Wakeup transmit queue engine
+                */
+               dev_activate(dev);
+
+               /*
+                *      ... and announce new interface.
+                */
+               call_netdevice_notifiers(NETDEV_UP, dev);
+       }
+
+       return ret;
+}
+
+/**
+ *     dev_close - shutdown an interface.
+ *     @dev: device to shutdown
+ *
+ *     This function moves an active device into down state. A
+ *     %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
+ *     is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
+ *     chain.
+ */
+int dev_close(struct net_device *dev)
+{
+       ASSERT_RTNL();
+
+       might_sleep();
+
+       if (!(dev->flags & IFF_UP))
+               return 0;
+
+       /*
+        *      Tell people we are going down, so that they can
+        *      prepare to death, when device is still operating.
+        */
+       call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
+
+       clear_bit(__LINK_STATE_START, &dev->state);
+
+       /* Synchronize to scheduled poll. We cannot touch poll list,
+        * it can be even on different cpu. So just clear netif_running().
+        *
+        * dev->stop() will invoke napi_disable() on all of it's
+        * napi_struct instances on this device.
+        */
+       smp_mb__after_clear_bit(); /* Commit netif_running(). */
+
+       dev_deactivate(dev);
+
+       /*
+        *      Call the device specific close. This cannot fail.
+        *      Only if device is UP
+        *
+        *      We allow it to be called even after a DETACH hot-plug
+        *      event.
+        */
+       if (dev->stop)
+               dev->stop(dev);
+
+       /*
+        *      Device is now down.
+        */
+
+       dev->flags &= ~IFF_UP;
+
+       /*
+        * Tell people we are down
+        */
+       call_netdevice_notifiers(NETDEV_DOWN, dev);
+
+       return 0;
+}
+
+
+/**
+ *     dev_disable_lro - disable Large Receive Offload on a device
+ *     @dev: device
+ *
+ *     Disable Large Receive Offload (LRO) on a net device.  Must be
+ *     called under RTNL.  This is needed if received packets may be
+ *     forwarded to another interface.
+ */
+void dev_disable_lro(struct net_device *dev)
+{
+       if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
+           dev->ethtool_ops->set_flags) {
+               u32 flags = dev->ethtool_ops->get_flags(dev);
+               if (flags & ETH_FLAG_LRO) {
+                       flags &= ~ETH_FLAG_LRO;
+                       dev->ethtool_ops->set_flags(dev, flags);
+               }
+       }
+       WARN_ON(dev->features & NETIF_F_LRO);
+}
+EXPORT_SYMBOL(dev_disable_lro);
+
+
+static int dev_boot_phase = 1;
+
+/*
+ *     Device change register/unregister. These are not inline or static
+ *     as we export them to the world.
+ */
+
+/**
+ *     register_netdevice_notifier - register a network notifier block
+ *     @nb: notifier
+ *
+ *     Register a notifier to be called when network device events occur.
+ *     The notifier passed is linked into the kernel structures and must
+ *     not be reused until it has been unregistered. A negative errno code
+ *     is returned on a failure.
+ *
+ *     When registered all registration and up events are replayed
+ *     to the new notifier to allow device to have a race free
+ *     view of the network device list.
+ */
+
+int register_netdevice_notifier(struct notifier_block *nb)
+{
+       struct net_device *dev;
+       struct net_device *last;
+       struct net *net;
+       int err;
+
+       rtnl_lock();
+       err = raw_notifier_chain_register(&netdev_chain, nb);
+       if (err)
+               goto unlock;
+       if (dev_boot_phase)
+               goto unlock;
+       for_each_net(net) {
+               for_each_netdev(net, dev) {
+                       err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
+                       err = notifier_to_errno(err);
+                       if (err)
+                               goto rollback;
+
+                       if (!(dev->flags & IFF_UP))
+                               continue;
+
+                       nb->notifier_call(nb, NETDEV_UP, dev);
+               }
+       }
+
+unlock:
+       rtnl_unlock();
+       return err;
+
+rollback:
+       last = dev;
+       for_each_net(net) {
+               for_each_netdev(net, dev) {
+                       if (dev == last)
+                               break;
+
+                       if (dev->flags & IFF_UP) {
+                               nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
+                               nb->notifier_call(nb, NETDEV_DOWN, dev);
+                       }
+                       nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
+               }
+       }
+
+       raw_notifier_chain_unregister(&netdev_chain, nb);
+       goto unlock;
+}
+
+/**
+ *     unregister_netdevice_notifier - unregister a network notifier block
+ *     @nb: notifier
+ *
+ *     Unregister a notifier previously registered by
+ *     register_netdevice_notifier(). The notifier is unlinked into the
+ *     kernel structures and may then be reused. A negative errno code
+ *     is returned on a failure.
+ */
+
+int unregister_netdevice_notifier(struct notifier_block *nb)
+{
+       int err;
+
+       rtnl_lock();
+       err = raw_notifier_chain_unregister(&netdev_chain, nb);
+       rtnl_unlock();
+       return err;
+}
+
+/**
+ *     call_netdevice_notifiers - call all network notifier blocks
+ *      @val: value passed unmodified to notifier function
+ *      @dev: net_device pointer passed unmodified to notifier function
+ *
+ *     Call all network notifier blocks.  Parameters and return value
+ *     are as for raw_notifier_call_chain().
+ */
+
+int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
+{
+       return raw_notifier_call_chain(&netdev_chain, val, dev);
+}
+
+/* When > 0 there are consumers of rx skb time stamps */
+static atomic_t netstamp_needed = ATOMIC_INIT(0);
+
+void net_enable_timestamp(void)
+{
+       atomic_inc(&netstamp_needed);
+}
+
+void net_disable_timestamp(void)
+{
+       atomic_dec(&netstamp_needed);
+}
+
+static inline void net_timestamp(struct sk_buff *skb)
+{
+       if (atomic_read(&netstamp_needed))
+               __net_timestamp(skb);
+       else
+               skb->tstamp.tv64 = 0;
+}
+
+/*
+ *     Support routine. Sends outgoing frames to any network
+ *     taps currently in use.
+ */
+
+static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
+{
+       struct packet_type *ptype;
+
+       net_timestamp(skb);
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(ptype, &ptype_all, list) {
+               /* Never send packets back to the socket
+                * they originated from - MvS (miquels@drinkel.ow.org)
+                */
+               if ((ptype->dev == dev || !ptype->dev) &&
+                   (ptype->af_packet_priv == NULL ||
+                    (struct sock *)ptype->af_packet_priv != skb->sk)) {
+                       struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
+                       if (!skb2)
+                               break;
+
+                       /* skb->nh should be correctly
+                          set by sender, so that the second statement is
+                          just protection against buggy protocols.
+                        */
+                       skb_reset_mac_header(skb2);
+
+                       if (skb_network_header(skb2) < skb2->data ||
+                           skb2->network_header > skb2->tail) {
+                               if (net_ratelimit())
+                                       printk(KERN_CRIT "protocol %04x is "
+                                              "buggy, dev %s\n",
+                                              skb2->protocol, dev->name);
+                               skb_reset_network_header(skb2);
+                       }
+
+                       skb2->transport_header = skb2->network_header;
+                       skb2->pkt_type = PACKET_OUTGOING;
+                       ptype->func(skb2, skb->dev, ptype, skb->dev);
+               }
+       }
+       rcu_read_unlock();
+}
+
+
+static inline void __netif_reschedule(struct Qdisc *q)
+{
+       struct softnet_data *sd;
+       unsigned long flags;
+
+       local_irq_save(flags);
+       sd = &__get_cpu_var(softnet_data);
+       q->next_sched = sd->output_queue;
+       sd->output_queue = q;
+       raise_softirq_irqoff(NET_TX_SOFTIRQ);
+       local_irq_restore(flags);
+}
+
+void __netif_schedule(struct Qdisc *q)
+{
+       if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
+               __netif_reschedule(q);
+}
+EXPORT_SYMBOL(__netif_schedule);
+
+void dev_kfree_skb_irq(struct sk_buff *skb)
+{
+       if (atomic_dec_and_test(&skb->users)) {
+               struct softnet_data *sd;
+               unsigned long flags;
+
+               local_irq_save(flags);
+               sd = &__get_cpu_var(softnet_data);
+               skb->next = sd->completion_queue;
+               sd->completion_queue = skb;
+               raise_softirq_irqoff(NET_TX_SOFTIRQ);
+               local_irq_restore(flags);
+       }
+}
+EXPORT_SYMBOL(dev_kfree_skb_irq);
+
+void dev_kfree_skb_any(struct sk_buff *skb)
+{
+       if (in_irq() || irqs_disabled())
+               dev_kfree_skb_irq(skb);
+       else
+               dev_kfree_skb(skb);
+}
+EXPORT_SYMBOL(dev_kfree_skb_any);
+
+
+/**
+ * netif_device_detach - mark device as removed
+ * @dev: network device
+ *
+ * Mark device as removed from system and therefore no longer available.
+ */
+void netif_device_detach(struct net_device *dev)
+{
+       if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
+           netif_running(dev)) {
+               netif_stop_queue(dev);
+       }
+}
+EXPORT_SYMBOL(netif_device_detach);
+
+/**
+ * netif_device_attach - mark device as attached
+ * @dev: network device
+ *
+ * Mark device as attached from system and restart if needed.
+ */
+void netif_device_attach(struct net_device *dev)
+{
+       if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
+           netif_running(dev)) {
+               netif_wake_queue(dev);
+               __netdev_watchdog_up(dev);
+       }
+}
+EXPORT_SYMBOL(netif_device_attach);
+
+static bool can_checksum_protocol(unsigned long features, __be16 protocol)
+{
+       return ((features & NETIF_F_GEN_CSUM) ||
+               ((features & NETIF_F_IP_CSUM) &&
+                protocol == htons(ETH_P_IP)) ||
+               ((features & NETIF_F_IPV6_CSUM) &&
+                protocol == htons(ETH_P_IPV6)));
+}
+
+static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
+{
+       if (can_checksum_protocol(dev->features, skb->protocol))
+               return true;
+
+       if (skb->protocol == htons(ETH_P_8021Q)) {
+               struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
+               if (can_checksum_protocol(dev->features & dev->vlan_features,
+                                         veh->h_vlan_encapsulated_proto))
+                       return true;
+       }
+
+       return false;
+}
+
+/*
+ * Invalidate hardware checksum when packet is to be mangled, and
+ * complete checksum manually on outgoing path.
+ */
+int skb_checksum_help(struct sk_buff *skb)
+{
+       __wsum csum;
+       int ret = 0, offset;
+
+       if (skb->ip_summed == CHECKSUM_COMPLETE)
+               goto out_set_summed;
+
+       if (unlikely(skb_shinfo(skb)->gso_size)) {
+               /* Let GSO fix up the checksum. */
+               goto out_set_summed;
+       }
+
+       offset = skb->csum_start - skb_headroom(skb);
+       BUG_ON(offset >= skb_headlen(skb));
+       csum = skb_checksum(skb, offset, skb->len - offset, 0);
+
+       offset += skb->csum_offset;
+       BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
+
+       if (skb_cloned(skb) &&
+           !skb_clone_writable(skb, offset + sizeof(__sum16))) {
+               ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
+               if (ret)
+                       goto out;
+       }
+
+       *(__sum16 *)(skb->data + offset) = csum_fold(csum);
+out_set_summed:
+       skb->ip_summed = CHECKSUM_NONE;
+out:
+       return ret;
+}
+
+/**
+ *     skb_gso_segment - Perform segmentation on skb.
+ *     @skb: buffer to segment
+ *     @features: features for the output path (see dev->features)
+ *
+ *     This function segments the given skb and returns a list of segments.
+ *
+ *     It may return NULL if the skb requires no segmentation.  This is
+ *     only possible when GSO is used for verifying header integrity.
+ */
+struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
+{
+       struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
+       struct packet_type *ptype;
+       __be16 type = skb->protocol;
+       int err;
+
+       BUG_ON(skb_shinfo(skb)->frag_list);
+
+       skb_reset_mac_header(skb);
+       skb->mac_len = skb->network_header - skb->mac_header;
+       __skb_pull(skb, skb->mac_len);
+
+       if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
+               if (skb_header_cloned(skb) &&
+                   (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
+                       return ERR_PTR(err);
+       }
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(ptype,
+                       &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
+               if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
+                       if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
+                               err = ptype->gso_send_check(skb);
+                               segs = ERR_PTR(err);
+                               if (err || skb_gso_ok(skb, features))
+                                       break;
+                               __skb_push(skb, (skb->data -
+                                                skb_network_header(skb)));
+                       }
+                       segs = ptype->gso_segment(skb, features);
+                       break;
+               }
+       }
+       rcu_read_unlock();
+
+       __skb_push(skb, skb->data - skb_mac_header(skb));
+
+       return segs;
+}
+
+EXPORT_SYMBOL(skb_gso_segment);
+
+/* Take action when hardware reception checksum errors are detected. */
+#ifdef CONFIG_BUG
+void netdev_rx_csum_fault(struct net_device *dev)
+{
+       if (net_ratelimit()) {
+               printk(KERN_ERR "%s: hw csum failure.\n",
+                       dev ? dev->name : "<unknown>");
+               dump_stack();
+       }
+}
+EXPORT_SYMBOL(netdev_rx_csum_fault);
+#endif
+
+/* Actually, we should eliminate this check as soon as we know, that:
+ * 1. IOMMU is present and allows to map all the memory.
+ * 2. No high memory really exists on this machine.
+ */
+
+static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
+{
+#ifdef CONFIG_HIGHMEM
+       int i;
+
+       if (dev->features & NETIF_F_HIGHDMA)
+               return 0;
+
+       for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
+               if (PageHighMem(skb_shinfo(skb)->frags[i].page))
+                       return 1;
+
+#endif
+       return 0;
+}
+
+struct dev_gso_cb {
+       void (*destructor)(struct sk_buff *skb);
+};
+
+#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
+
+static void dev_gso_skb_destructor(struct sk_buff *skb)
+{
+       struct dev_gso_cb *cb;
+
+       do {
+               struct sk_buff *nskb = skb->next;
+
+               skb->next = nskb->next;
+               nskb->next = NULL;
+               kfree_skb(nskb);
+       } while (skb->next);
+
+       cb = DEV_GSO_CB(skb);
+       if (cb->destructor)
+               cb->destructor(skb);
+}
+
+/**
+ *     dev_gso_segment - Perform emulated hardware segmentation on skb.
+ *     @skb: buffer to segment
+ *
+ *     This function segments the given skb and stores the list of segments
+ *     in skb->next.
+ */
+static int dev_gso_segment(struct sk_buff *skb)
+{
+       struct net_device *dev = skb->dev;
+       struct sk_buff *segs;
+       int features = dev->features & ~(illegal_highdma(dev, skb) ?
+                                        NETIF_F_SG : 0);
+
+       segs = skb_gso_segment(skb, features);
+
+       /* Verifying header integrity only. */
+       if (!segs)
+               return 0;
+
+       if (IS_ERR(segs))
+               return PTR_ERR(segs);
+
+       skb->next = segs;
+       DEV_GSO_CB(skb)->destructor = skb->destructor;
+       skb->destructor = dev_gso_skb_destructor;
+
+       return 0;
+}
+
+int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
+                       struct netdev_queue *txq)
+{
+       if (likely(!skb->next)) {
+               if (!list_empty(&ptype_all))
+                       dev_queue_xmit_nit(skb, dev);
+
+               if (netif_needs_gso(dev, skb)) {
+                       if (unlikely(dev_gso_segment(skb)))
+                               goto out_kfree_skb;
+                       if (skb->next)
+                               goto gso;
+               }
+
+               return dev->hard_start_xmit(skb, dev);
+       }
+
+gso:
+       do {
+               struct sk_buff *nskb = skb->next;
+               int rc;
+
+               skb->next = nskb->next;
+               nskb->next = NULL;
+               rc = dev->hard_start_xmit(nskb, dev);
+               if (unlikely(rc)) {
+                       nskb->next = skb->next;
+                       skb->next = nskb;
+                       return rc;
+               }
+               if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
+                       return NETDEV_TX_BUSY;
+       } while (skb->next);
+
+       skb->destructor = DEV_GSO_CB(skb)->destructor;
+
+out_kfree_skb:
+       kfree_skb(skb);
+       return 0;
+}
+
+static u32 simple_tx_hashrnd;
+static int simple_tx_hashrnd_initialized = 0;
+
+static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb)
+{
+       u32 addr1, addr2, ports;
+       u32 hash, ihl;
+       u8 ip_proto = 0;
+
+       if (unlikely(!simple_tx_hashrnd_initialized)) {
+               get_random_bytes(&simple_tx_hashrnd, 4);
+               simple_tx_hashrnd_initialized = 1;
+       }
+
+       switch (skb->protocol) {
+       case __constant_htons(ETH_P_IP):
+               if (!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)))
+                       ip_proto = ip_hdr(skb)->protocol;
+               addr1 = ip_hdr(skb)->saddr;
+               addr2 = ip_hdr(skb)->daddr;
+               ihl = ip_hdr(skb)->ihl;
+               break;
+       case __constant_htons(ETH_P_IPV6):
+               ip_proto = ipv6_hdr(skb)->nexthdr;
+               addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3];
+               addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3];
+               ihl = (40 >> 2);
+               break;
+       default:
+               return 0;
+       }
+
+
+       switch (ip_proto) {
+       case IPPROTO_TCP:
+       case IPPROTO_UDP:
+       case IPPROTO_DCCP:
+       case IPPROTO_ESP:
+       case IPPROTO_AH:
+       case IPPROTO_SCTP:
+       case IPPROTO_UDPLITE:
+               ports = *((u32 *) (skb_network_header(skb) + (ihl * 4)));
+               break;
+
+       default:
+               ports = 0;
+               break;
+       }
+
+       hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd);
+
+       return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
+}
+
+static struct netdev_queue *dev_pick_tx(struct net_device *dev,
+                                       struct sk_buff *skb)
+{
+       u16 queue_index = 0;
+
+       if (dev->select_queue)
+               queue_index = dev->select_queue(dev, skb);
+       else if (dev->real_num_tx_queues > 1)
+               queue_index = simple_tx_hash(dev, skb);
+
+       skb_set_queue_mapping(skb, queue_index);
+       return netdev_get_tx_queue(dev, queue_index);
+}
+
+/**
+ *     dev_queue_xmit - transmit a buffer
+ *     @skb: buffer to transmit
+ *
+ *     Queue a buffer for transmission to a network device. The caller must
+ *     have set the device and priority and built the buffer before calling
+ *     this function. The function can be called from an interrupt.
+ *
+ *     A negative errno code is returned on a failure. A success does not
+ *     guarantee the frame will be transmitted as it may be dropped due
+ *     to congestion or traffic shaping.
+ *
+ * -----------------------------------------------------------------------------------
+ *      I notice this method can also return errors from the queue disciplines,
+ *      including NET_XMIT_DROP, which is a positive value.  So, errors can also
+ *      be positive.
+ *
+ *      Regardless of the return value, the skb is consumed, so it is currently
+ *      difficult to retry a send to this method.  (You can bump the ref count
+ *      before sending to hold a reference for retry if you are careful.)
+ *
+ *      When calling this method, interrupts MUST be enabled.  This is because
+ *      the BH enable code must have IRQs enabled so that it will not deadlock.
+ *          --BLG
+ */
+int dev_queue_xmit(struct sk_buff *skb)
+{
+       struct net_device *dev = skb->dev;
+       struct netdev_queue *txq;
+       struct Qdisc *q;
+       int rc = -ENOMEM;
+
+       /* GSO will handle the following emulations directly. */
+       if (netif_needs_gso(dev, skb))
+               goto gso;
+
+       if (skb_shinfo(skb)->frag_list &&
+           !(dev->features & NETIF_F_FRAGLIST) &&
+           __skb_linearize(skb))
+               goto out_kfree_skb;
+
+       /* Fragmented skb is linearized if device does not support SG,
+        * or if at least one of fragments is in highmem and device
+        * does not support DMA from it.
+        */
+       if (skb_shinfo(skb)->nr_frags &&
+           (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
+           __skb_linearize(skb))
+               goto out_kfree_skb;
+
+       /* If packet is not checksummed and device does not support
+        * checksumming for this protocol, complete checksumming here.
+        */
+       if (skb->ip_summed == CHECKSUM_PARTIAL) {
+               skb_set_transport_header(skb, skb->csum_start -
+                                             skb_headroom(skb));
+               if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
+                       goto out_kfree_skb;
+       }
+
+gso:
+       /* Disable soft irqs for various locks below. Also
+        * stops preemption for RCU.
+        */
+       rcu_read_lock_bh();
+
+       txq = dev_pick_tx(dev, skb);
+       q = rcu_dereference(txq->qdisc);
+
+#ifdef CONFIG_NET_CLS_ACT
+       skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
+#endif
+       if (q->enqueue) {
+               spinlock_t *root_lock = qdisc_lock(q);
+
+               spin_lock(root_lock);
+
+               if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
+                       kfree_skb(skb);
+                       rc = NET_XMIT_DROP;
+               } else {
+                       rc = qdisc_enqueue_root(skb, q);
+                       qdisc_run(q);
+               }
+               spin_unlock(root_lock);
+
+               goto out;
+       }
+
+       /* The device has no queue. Common case for software devices:
+          loopback, all the sorts of tunnels...
+
+          Really, it is unlikely that netif_tx_lock protection is necessary
+          here.  (f.e. loopback and IP tunnels are clean ignoring statistics
+          counters.)
+          However, it is possible, that they rely on protection
+          made by us here.
+
+          Check this and shot the lock. It is not prone from deadlocks.
+          Either shot noqueue qdisc, it is even simpler 8)
+        */
+       if (dev->flags & IFF_UP) {
+               int cpu = smp_processor_id(); /* ok because BHs are off */
+
+               if (txq->xmit_lock_owner != cpu) {
+
+                       HARD_TX_LOCK(dev, txq, cpu);
+
+                       if (!netif_tx_queue_stopped(txq)) {
+                               rc = 0;
+                               if (!dev_hard_start_xmit(skb, dev, txq)) {
+                                       HARD_TX_UNLOCK(dev, txq);
+                                       goto out;
+                               }
+                       }
+                       HARD_TX_UNLOCK(dev, txq);
+                       if (net_ratelimit())
+                               printk(KERN_CRIT "Virtual device %s asks to "
+                                      "queue packet!\n", dev->name);
+               } else {
+                       /* Recursion is detected! It is possible,
+                        * unfortunately */
+                       if (net_ratelimit())
+                               printk(KERN_CRIT "Dead loop on virtual device "
+                                      "%s, fix it urgently!\n", dev->name);
+               }
+       }
+
+       rc = -ENETDOWN;
+       rcu_read_unlock_bh();
+
+out_kfree_skb:
+       kfree_skb(skb);
+       return rc;
+out:
+       rcu_read_unlock_bh();
+       return rc;
+}
+
+
+/*=======================================================================
+                       Receiver routines
+  =======================================================================*/
+
+int netdev_max_backlog __read_mostly = 1000;
+int netdev_budget __read_mostly = 300;
+int weight_p __read_mostly = 64;            /* old backlog weight */
+
+DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
+
+
+/**
+ *     netif_rx        -       post buffer to the network code
+ *     @skb: buffer to post
+ *
+ *     This function receives a packet from a device driver and queues it for
+ *     the upper (protocol) levels to process.  It always succeeds. The buffer
+ *     may be dropped during processing for congestion control or by the
+ *     protocol layers.
+ *
+ *     return values:
+ *     NET_RX_SUCCESS  (no congestion)
+ *     NET_RX_DROP     (packet was dropped)
+ *
+ */
+
+int netif_rx(struct sk_buff *skb)
+{
+       struct softnet_data *queue;
+       unsigned long flags;
+
+       /* if netpoll wants it, pretend we never saw it */
+       if (netpoll_rx(skb))
+               return NET_RX_DROP;
+
+       if (!skb->tstamp.tv64)
+               net_timestamp(skb);
+
+       /*
+        * The code is rearranged so that the path is the most
+        * short when CPU is congested, but is still operating.
+        */
+       local_irq_save(flags);
+       queue = &__get_cpu_var(softnet_data);
+
+       __get_cpu_var(netdev_rx_stat).total++;
+       if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
+               if (queue->input_pkt_queue.qlen) {
+enqueue:
+                       __skb_queue_tail(&queue->input_pkt_queue, skb);
+                       local_irq_restore(flags);
+                       return NET_RX_SUCCESS;
+               }
+
+               napi_schedule(&queue->backlog);
+               goto enqueue;
+       }
+
+       __get_cpu_var(netdev_rx_stat).dropped++;
+       local_irq_restore(flags);
+
+       kfree_skb(skb);
+       return NET_RX_DROP;
+}
+
+int netif_rx_ni(struct sk_buff *skb)
+{
+       int err;
+
+       preempt_disable();
+       err = netif_rx(skb);
+       if (local_softirq_pending())
+               do_softirq();
+       preempt_enable();
+
+       return err;
+}
+
+EXPORT_SYMBOL(netif_rx_ni);
+
+static void net_tx_action(struct softirq_action *h)
+{
+       struct softnet_data *sd = &__get_cpu_var(softnet_data);
+
+       if (sd->completion_queue) {
+               struct sk_buff *clist;
+
+               local_irq_disable();
+               clist = sd->completion_queue;
+               sd->completion_queue = NULL;
+               local_irq_enable();
+
+               while (clist) {
+                       struct sk_buff *skb = clist;
+                       clist = clist->next;
+
+                       WARN_ON(atomic_read(&skb->users));
+                       __kfree_skb(skb);
+               }
+       }
+
+       if (sd->output_queue) {
+               struct Qdisc *head;
+
+               local_irq_disable();
+               head = sd->output_queue;
+               sd->output_queue = NULL;
+               local_irq_enable();
+
+               while (head) {
+                       struct Qdisc *q = head;
+                       spinlock_t *root_lock;
+
+                       head = head->next_sched;
+
+                       root_lock = qdisc_lock(q);
+                       if (spin_trylock(root_lock)) {
+                               smp_mb__before_clear_bit();
+                               clear_bit(__QDISC_STATE_SCHED,
+                                         &q->state);
+                               qdisc_run(q);
+                               spin_unlock(root_lock);
+                       } else {
+                               if (!test_bit(__QDISC_STATE_DEACTIVATED,
+                                             &q->state)) {
+                                       __netif_reschedule(q);
+                               } else {
+                                       smp_mb__before_clear_bit();
+                                       clear_bit(__QDISC_STATE_SCHED,
+                                                 &q->state);
+                               }
+                       }
+               }
+       }
+}
+
+static inline int deliver_skb(struct sk_buff *skb,
+                             struct packet_type *pt_prev,
+                             struct net_device *orig_dev)
+{
+       atomic_inc(&skb->users);
+       return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
+}
+
+
+/*
+ * Click: Allow Click to ask to intercept input packets.
+ */
+int
+register_net_in(struct notifier_block *nb)
+{
+       int err;
+       rtnl_lock();
+       err = raw_notifier_chain_register(&net_in_chain, nb);
+       rtnl_unlock();
+       return err;
+}
+
+int
+unregister_net_in(struct notifier_block *nb)
+{
+       int err;
+       rtnl_lock();
+       err = raw_notifier_chain_unregister(&net_in_chain, nb);
+       rtnl_unlock();
+       return err;
+}
+
+
+#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
+/* These hooks defined here for ATM */
+struct net_bridge;
+struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
+                                               unsigned char *addr);
+void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
+
+/*
+ * If bridge module is loaded call bridging hook.
+ *  returns NULL if packet was consumed.
+ */
+struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
+                                       struct sk_buff *skb) __read_mostly;
+static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
+                                           struct packet_type **pt_prev, int *ret,
+                                           struct net_device *orig_dev)
+{
+       struct net_bridge_port *port;
+
+       if (skb->pkt_type == PACKET_LOOPBACK ||
+           (port = rcu_dereference(skb->dev->br_port)) == NULL)
+               return skb;
+
+       if (*pt_prev) {
+               *ret = deliver_skb(skb, *pt_prev, orig_dev);
+               *pt_prev = NULL;
+       }
+
+       return br_handle_frame_hook(port, skb);
+}
+#else
+#define handle_bridge(skb, pt_prev, ret, orig_dev)     (skb)
+#endif
+
+#if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
+struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
+EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
+
+static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
+                                            struct packet_type **pt_prev,
+                                            int *ret,
+                                            struct net_device *orig_dev)
+{
+       if (skb->dev->macvlan_port == NULL)
+               return skb;
+
+       if (*pt_prev) {
+               *ret = deliver_skb(skb, *pt_prev, orig_dev);
+               *pt_prev = NULL;
+       }
+       return macvlan_handle_frame_hook(skb);
+}
+#else
+#define handle_macvlan(skb, pt_prev, ret, orig_dev)    (skb)
+#endif
+
+#ifdef CONFIG_NET_CLS_ACT
+/* TODO: Maybe we should just force sch_ingress to be compiled in
+ * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
+ * a compare and 2 stores extra right now if we dont have it on
+ * but have CONFIG_NET_CLS_ACT
+ * NOTE: This doesnt stop any functionality; if you dont have
+ * the ingress scheduler, you just cant add policies on ingress.
+ *
+ */
+static int ing_filter(struct sk_buff *skb)
+{
+       struct net_device *dev = skb->dev;
+       u32 ttl = G_TC_RTTL(skb->tc_verd);
+       struct netdev_queue *rxq;
+       int result = TC_ACT_OK;
+       struct Qdisc *q;
+
+       if (MAX_RED_LOOP < ttl++) {
+               printk(KERN_WARNING
+                      "Redir loop detected Dropping packet (%d->%d)\n",
+                      skb->iif, dev->ifindex);
+               return TC_ACT_SHOT;
+       }
+
+       skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
+       skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
+
+       rxq = &dev->rx_queue;
+
+       q = rxq->qdisc;
+       if (q != &noop_qdisc) {
+               spin_lock(qdisc_lock(q));
+               if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
+                       result = qdisc_enqueue_root(skb, q);
+               spin_unlock(qdisc_lock(q));
+       }
+
+       return result;
+}
+
+static inline struct sk_buff *handle_ing(struct sk_buff *skb,
+                                        struct packet_type **pt_prev,
+                                        int *ret, struct net_device *orig_dev)
+{
+       if (skb->dev->rx_queue.qdisc == &noop_qdisc)
+               goto out;
+
+       if (*pt_prev) {
+               *ret = deliver_skb(skb, *pt_prev, orig_dev);
+               *pt_prev = NULL;
+       } else {
+               /* Huh? Why does turning on AF_PACKET affect this? */
+               skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
+       }
+
+       switch (ing_filter(skb)) {
+       case TC_ACT_SHOT:
+       case TC_ACT_STOLEN:
+               kfree_skb(skb);
+               return NULL;
+       }
+
+out:
+       skb->tc_verd = 0;
+       return skb;
+}
+#endif
+
+/*
+ *     netif_nit_deliver - deliver received packets to network taps
+ *     @skb: buffer
+ *
+ *     This function is used to deliver incoming packets to network
+ *     taps. It should be used when the normal netif_receive_skb path
+ *     is bypassed, for example because of VLAN acceleration.
+ */
+void netif_nit_deliver(struct sk_buff *skb)
+{
+       struct packet_type *ptype;
+
+       if (list_empty(&ptype_all))
+               return;
+
+       skb_reset_network_header(skb);
+       skb_reset_transport_header(skb);
+       skb->mac_len = skb->network_header - skb->mac_header;
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(ptype, &ptype_all, list) {
+               if (!ptype->dev || ptype->dev == skb->dev)
+                       deliver_skb(skb, ptype, skb->dev);
+       }
+       rcu_read_unlock();
+}
+
+/**
+ *     netif_receive_skb - process receive buffer from network
+ *     @skb: buffer to process
+ *
+ *     netif_receive_skb() is the main receive data processing function.
+ *     It always succeeds. The buffer may be dropped during processing
+ *     for congestion control or by the protocol layers.
+ *
+ *     This function may only be called from softirq context and interrupts
+ *     should be enabled.
+ *
+ *     Return values (usually ignored):
+ *     NET_RX_SUCCESS: no congestion
+ *     NET_RX_DROP: packet was dropped
+ */
+//int netif_receive_skb(struct sk_buff *skb)
+int __netif_receive_skb(struct sk_buff *skb, unsigned short type, int notifier_data)
+{
+       struct packet_type *ptype, *pt_prev;
+       struct net_device *orig_dev;
+       struct net_device *null_or_orig;
+       int ret = NET_RX_DROP;
+//     __be16 type;
+
+       /* if we've gotten here through NAPI, check netpoll */
+       if (netpoll_receive_skb(skb))
+               return NET_RX_DROP;
+
+       if (!skb->tstamp.tv64)
+               net_timestamp(skb);
+
+       if (!skb->iif)
+               skb->iif = skb->dev->ifindex;
+
+       null_or_orig = NULL;
+       orig_dev = skb->dev;
+       if (orig_dev->master) {
+               if (skb_bond_should_drop(skb))
+                       null_or_orig = orig_dev; /* deliver only exact match */
+               else
+                       skb->dev = orig_dev->master;
+       }
+
+       __get_cpu_var(netdev_rx_stat).total++;
+
+       skb_reset_network_header(skb);
+       skb_reset_transport_header(skb);
+       skb->mac_len = skb->network_header - skb->mac_header;
+
+       /* Click: may want to steal the packet */
+       if (notifier_data >= 0
+           && raw_notifier_call_chain(&net_in_chain,
+                                  notifier_data,
+                                  skb) & NOTIFY_STOP_MASK) {
+               return ret;
+       }
+ 
+       pt_prev = NULL;
+
+       rcu_read_lock();
+
+       /* Don't receive packets in an exiting network namespace */
+       if (!net_alive(dev_net(skb->dev)))
+               goto out;
+
+#ifdef CONFIG_NET_CLS_ACT
+       if (skb->tc_verd & TC_NCLS) {
+               skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
+               goto ncls;
+       }
+#endif
+
+       list_for_each_entry_rcu(ptype, &ptype_all, list) {
+               if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
+                   ptype->dev == orig_dev) {
+                       if (pt_prev)
+                               ret = deliver_skb(skb, pt_prev, orig_dev);
+                       pt_prev = ptype;
+               }
+       }
+
+#ifdef CONFIG_NET_CLS_ACT
+       skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
+       if (!skb)
+               goto out;
+ncls:
+#endif
+
+       skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
+       if (!skb)
+               goto out;
+       skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
+       if (!skb)
+               goto out;
+
+       type = skb->protocol;
+       list_for_each_entry_rcu(ptype,
+                       &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
+               if (ptype->type == type &&
+                   (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
+                    ptype->dev == orig_dev)) {
+                       if (pt_prev)
+                               ret = deliver_skb(skb, pt_prev, orig_dev);
+                       pt_prev = ptype;
+               }
+       }
+
+       if (pt_prev) {
+               ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
+       } else {
+               kfree_skb(skb);
+               /* Jamal, now you will not able to escape explaining
+                * me how you were going to use this. :-)
+                */
+               ret = NET_RX_DROP;
+       }
+
+out:
+       rcu_read_unlock();
+       return ret;
+}
+
+/* Network device is going away, flush any packets still pending  */
+static void flush_backlog(void *arg)
+{
+       struct net_device *dev = arg;
+       struct softnet_data *queue = &__get_cpu_var(softnet_data);
+       struct sk_buff *skb, *tmp;
+
+       skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
+               if (skb->dev == dev) {
+                       __skb_unlink(skb, &queue->input_pkt_queue);
+                       kfree_skb(skb);
+               }
+}
+
+static int process_backlog(struct napi_struct *napi, int quota)
+{
+       int work = 0;
+       struct softnet_data *queue = &__get_cpu_var(softnet_data);
+       unsigned long start_time = jiffies;
+
+       napi->weight = weight_p;
+       do {
+               struct sk_buff *skb;
+
+               local_irq_disable();
+               skb = __skb_dequeue(&queue->input_pkt_queue);
+               if (!skb) {
+                       __napi_complete(napi);
+                       local_irq_enable();
+                       break;
+               }
+               local_irq_enable();
+
+               __netif_receive_skb(skb, skb->protocol, skb_queue_len(&queue->input_pkt_queue));
+//XXX          netif_receive_skb(skb);
+       } while (++work < quota && jiffies == start_time);
+
+       return work;
+}
+
+/**
+ * __napi_schedule - schedule for receive
+ * @n: entry to schedule
+ *
+ * The entry's receive function will be scheduled to run
+ */
+void __napi_schedule(struct napi_struct *n)
+{
+       unsigned long flags;
+
+       local_irq_save(flags);
+       list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
+       __raise_softirq_irqoff(NET_RX_SOFTIRQ);
+       local_irq_restore(flags);
+}
+EXPORT_SYMBOL(__napi_schedule);
+
+
+static void net_rx_action(struct softirq_action *h)
+{
+       struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
+       unsigned long start_time = jiffies;
+       int budget = netdev_budget;
+       void *have;
+
+       local_irq_disable();
+
+       while (!list_empty(list)) {
+               struct napi_struct *n;
+               int work, weight;
+
+               /* If softirq window is exhuasted then punt.
+                *
+                * Note that this is a slight policy change from the
+                * previous NAPI code, which would allow up to 2
+                * jiffies to pass before breaking out.  The test
+                * used to be "jiffies - start_time > 1".
+                */
+               if (unlikely(budget <= 0 || jiffies != start_time))
+                       goto softnet_break;
+
+               local_irq_enable();
+
+               /* Even though interrupts have been re-enabled, this
+                * access is safe because interrupts can only add new
+                * entries to the tail of this list, and only ->poll()
+                * calls can remove this head entry from the list.
+                */
+               n = list_entry(list->next, struct napi_struct, poll_list);
+
+               have = netpoll_poll_lock(n);
+
+               weight = n->weight;
+
+               /* This NAPI_STATE_SCHED test is for avoiding a race
+                * with netpoll's poll_napi().  Only the entity which
+                * obtains the lock and sees NAPI_STATE_SCHED set will
+                * actually make the ->poll() call.  Therefore we avoid
+                * accidently calling ->poll() when NAPI is not scheduled.
+                */
+               work = 0;
+               if (test_bit(NAPI_STATE_SCHED, &n->state))
+                       work = n->poll(n, weight);
+
+               WARN_ON_ONCE(work > weight);
+
+               budget -= work;
+
+               local_irq_disable();
+
+               /* Drivers must not modify the NAPI state if they
+                * consume the entire weight.  In such cases this code
+                * still "owns" the NAPI instance and therefore can
+                * move the instance around on the list at-will.
+                */
+               if (unlikely(work == weight)) {
+                       if (unlikely(napi_disable_pending(n)))
+                               __napi_complete(n);
+                       else
+                               list_move_tail(&n->poll_list, list);
+               }
+
+               netpoll_poll_unlock(have);
+       }
+out:
+       local_irq_enable();
+
+#ifdef CONFIG_NET_DMA
+       /*
+        * There may not be any more sk_buffs coming right now, so push
+        * any pending DMA copies to hardware
+        */
+       if (!cpus_empty(net_dma.channel_mask)) {
+               int chan_idx;
+               for_each_cpu_mask_nr(chan_idx, net_dma.channel_mask) {
+                       struct dma_chan *chan = net_dma.channels[chan_idx];
+                       if (chan)
+                               dma_async_memcpy_issue_pending(chan);
+               }
+       }
+#endif
+
+       return;
+
+softnet_break:
+       __get_cpu_var(netdev_rx_stat).time_squeeze++;
+       __raise_softirq_irqoff(NET_RX_SOFTIRQ);
+       goto out;
+}
+
+static gifconf_func_t * gifconf_list [NPROTO];
+
+/**
+ *     register_gifconf        -       register a SIOCGIF handler
+ *     @family: Address family
+ *     @gifconf: Function handler
+ *
+ *     Register protocol dependent address dumping routines. The handler
+ *     that is passed must not be freed or reused until it has been replaced
+ *     by another handler.
+ */
+int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
+{
+       if (family >= NPROTO)
+               return -EINVAL;
+       gifconf_list[family] = gifconf;
+       return 0;
+}
+
+
+/*
+ *     Map an interface index to its name (SIOCGIFNAME)
+ */
+
+/*
+ *     We need this ioctl for efficient implementation of the
+ *     if_indextoname() function required by the IPv6 API.  Without
+ *     it, we would have to search all the interfaces to find a
+ *     match.  --pb
+ */
+
+static int dev_ifname(struct net *net, struct ifreq __user *arg)
+{
+       struct net_device *dev;
+       struct ifreq ifr;
+
+       /*
+        *      Fetch the caller's info block.
+        */
+
+       if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
+               return -EFAULT;
+
+       read_lock(&dev_base_lock);
+       dev = __dev_get_by_index(net, ifr.ifr_ifindex);
+       if (!dev) {
+               read_unlock(&dev_base_lock);
+               return -ENODEV;
+       }
+
+       strcpy(ifr.ifr_name, dev->name);
+       read_unlock(&dev_base_lock);
+
+       if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
+               return -EFAULT;
+       return 0;
+}
+
+/*
+ *     Perform a SIOCGIFCONF call. This structure will change
+ *     size eventually, and there is nothing I can do about it.
+ *     Thus we will need a 'compatibility mode'.
+ */
+
+static int dev_ifconf(struct net *net, char __user *arg)
+{
+       struct ifconf ifc;
+       struct net_device *dev;
+       char __user *pos;
+       int len;
+       int total;
+       int i;
+
+       /*
+        *      Fetch the caller's info block.
+        */
+
+       if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
+               return -EFAULT;
+
+       pos = ifc.ifc_buf;
+       len = ifc.ifc_len;
+
+       /*
+        *      Loop over the interfaces, and write an info block for each.
+        */
+
+       total = 0;
+       for_each_netdev(net, dev) {
+               if (!nx_dev_visible(current->nx_info, dev))
+                       continue;
+               for (i = 0; i < NPROTO; i++) {
+                       if (gifconf_list[i]) {
+                               int done;
+                               if (!pos)
+                                       done = gifconf_list[i](dev, NULL, 0);
+                               else
+                                       done = gifconf_list[i](dev, pos + total,
+                                                              len - total);
+                               if (done < 0)
+                                       return -EFAULT;
+                               total += done;
+                       }
+               }
+       }
+
+       /*
+        *      All done.  Write the updated control block back to the caller.
+        */
+       ifc.ifc_len = total;
+
+       /*
+        *      Both BSD and Solaris return 0 here, so we do too.
+        */
+       return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
+}
+
+#ifdef CONFIG_PROC_FS
+/*
+ *     This is invoked by the /proc filesystem handler to display a device
+ *     in detail.
+ */
+void *dev_seq_start(struct seq_file *seq, loff_t *pos)
+       __acquires(dev_base_lock)
+{
+       struct net *net = seq_file_net(seq);
+       loff_t off;
+       struct net_device *dev;
+
+       read_lock(&dev_base_lock);
+       if (!*pos)
+               return SEQ_START_TOKEN;
+
+       off = 1;
+       for_each_netdev(net, dev)
+               if (off++ == *pos)
+                       return dev;
+
+       return NULL;
+}
+
+void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+       struct net *net = seq_file_net(seq);
+       ++*pos;
+       return v == SEQ_START_TOKEN ?
+               first_net_device(net) : next_net_device((struct net_device *)v);
+}
+
+void dev_seq_stop(struct seq_file *seq, void *v)
+       __releases(dev_base_lock)
+{
+       read_unlock(&dev_base_lock);
+}
+
+static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
+{
+       struct net_device_stats *stats = dev->get_stats(dev);
+
+       if (!nx_dev_visible(current->nx_info, dev))
+               return;
+
+       seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
+                  "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
+                  dev->name, stats->rx_bytes, stats->rx_packets,
+                  stats->rx_errors,
+                  stats->rx_dropped + stats->rx_missed_errors,
+                  stats->rx_fifo_errors,
+                  stats->rx_length_errors + stats->rx_over_errors +
+                   stats->rx_crc_errors + stats->rx_frame_errors,
+                  stats->rx_compressed, stats->multicast,
+                  stats->tx_bytes, stats->tx_packets,
+                  stats->tx_errors, stats->tx_dropped,
+                  stats->tx_fifo_errors, stats->collisions,
+                  stats->tx_carrier_errors +
+                   stats->tx_aborted_errors +
+                   stats->tx_window_errors +
+                   stats->tx_heartbeat_errors,
+                  stats->tx_compressed);
+}
+
+/*
+ *     Called from the PROCfs module. This now uses the new arbitrary sized
+ *     /proc/net interface to create /proc/net/dev
+ */
+static int dev_seq_show(struct seq_file *seq, void *v)
+{
+       if (v == SEQ_START_TOKEN)
+               seq_puts(seq, "Inter-|   Receive                            "
+                             "                    |  Transmit\n"
+                             " face |bytes    packets errs drop fifo frame "
+                             "compressed multicast|bytes    packets errs "
+                             "drop fifo colls carrier compressed\n");
+       else
+               dev_seq_printf_stats(seq, v);
+       return 0;
+}
+
+static struct netif_rx_stats *softnet_get_online(loff_t *pos)
+{
+       struct netif_rx_stats *rc = NULL;
+
+       while (*pos < nr_cpu_ids)
+               if (cpu_online(*pos)) {
+                       rc = &per_cpu(netdev_rx_stat, *pos);
+                       break;
+               } else
+                       ++*pos;
+       return rc;
+}
+
+static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
+{
+       return softnet_get_online(pos);
+}
+
+static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+       ++*pos;
+       return softnet_get_online(pos);
+}
+
+static void softnet_seq_stop(struct seq_file *seq, void *v)
+{
+}
+
+static int softnet_seq_show(struct seq_file *seq, void *v)
+{
+       struct netif_rx_stats *s = v;
+
+       seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
+                  s->total, s->dropped, s->time_squeeze, 0,
+                  0, 0, 0, 0, /* was fastroute */
+                  s->cpu_collision );
+       return 0;
+}
+
+static const struct seq_operations dev_seq_ops = {
+       .start = dev_seq_start,
+       .next  = dev_seq_next,
+       .stop  = dev_seq_stop,
+       .show  = dev_seq_show,
+};
+
+static int dev_seq_open(struct inode *inode, struct file *file)
+{
+       return seq_open_net(inode, file, &dev_seq_ops,
+                           sizeof(struct seq_net_private));
+}
+
+static const struct file_operations dev_seq_fops = {
+       .owner   = THIS_MODULE,
+       .open    = dev_seq_open,
+       .read    = seq_read,
+       .llseek  = seq_lseek,
+       .release = seq_release_net,
+};
+
+static const struct seq_operations softnet_seq_ops = {
+       .start = softnet_seq_start,
+       .next  = softnet_seq_next,
+       .stop  = softnet_seq_stop,
+       .show  = softnet_seq_show,
+};
+
+static int softnet_seq_open(struct inode *inode, struct file *file)
+{
+       return seq_open(file, &softnet_seq_ops);
+}
+
+static const struct file_operations softnet_seq_fops = {
+       .owner   = THIS_MODULE,
+       .open    = softnet_seq_open,
+       .read    = seq_read,
+       .llseek  = seq_lseek,
+       .release = seq_release,
+};
+
+static void *ptype_get_idx(loff_t pos)
+{
+       struct packet_type *pt = NULL;
+       loff_t i = 0;
+       int t;
+
+       list_for_each_entry_rcu(pt, &ptype_all, list) {
+               if (i == pos)
+                       return pt;
+               ++i;
+       }
+
+       for (t = 0; t < PTYPE_HASH_SIZE; t++) {
+               list_for_each_entry_rcu(pt, &ptype_base[t], list) {
+                       if (i == pos)
+                               return pt;
+                       ++i;
+               }
+       }
+       return NULL;
+}
+
+static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
+       __acquires(RCU)
+{
+       rcu_read_lock();
+       return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+       struct packet_type *pt;
+       struct list_head *nxt;
+       int hash;
+
+       ++*pos;
+       if (v == SEQ_START_TOKEN)
+               return ptype_get_idx(0);
+
+       pt = v;
+       nxt = pt->list.next;
+       if (pt->type == htons(ETH_P_ALL)) {
+               if (nxt != &ptype_all)
+                       goto found;
+               hash = 0;
+               nxt = ptype_base[0].next;
+       } else
+               hash = ntohs(pt->type) & PTYPE_HASH_MASK;
+
+       while (nxt == &ptype_base[hash]) {
+               if (++hash >= PTYPE_HASH_SIZE)
+                       return NULL;
+               nxt = ptype_base[hash].next;
+       }
+found:
+       return list_entry(nxt, struct packet_type, list);
+}
+
+static void ptype_seq_stop(struct seq_file *seq, void *v)
+       __releases(RCU)
+{
+       rcu_read_unlock();
+}
+
+static void ptype_seq_decode(struct seq_file *seq, void *sym)
+{
+#ifdef CONFIG_KALLSYMS
+       unsigned long offset = 0, symsize;
+       const char *symname;
+       char *modname;
+       char namebuf[128];
+
+       symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
+                                 &modname, namebuf);
+
+       if (symname) {
+               char *delim = ":";
+
+               if (!modname)
+                       modname = delim = "";
+               seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
+                          symname, offset);
+               return;
+       }
+#endif
+
+       seq_printf(seq, "[%p]", sym);
+}
+
+static int ptype_seq_show(struct seq_file *seq, void *v)
+{
+       struct packet_type *pt = v;
+
+       if (v == SEQ_START_TOKEN)
+               seq_puts(seq, "Type Device      Function\n");
+       else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
+               if (pt->type == htons(ETH_P_ALL))
+                       seq_puts(seq, "ALL ");
+               else
+                       seq_printf(seq, "%04x", ntohs(pt->type));
+
+               seq_printf(seq, " %-8s ",
+                          pt->dev ? pt->dev->name : "");
+               ptype_seq_decode(seq,  pt->func);
+               seq_putc(seq, '\n');
+       }
+
+       return 0;
+}
+
+static const struct seq_operations ptype_seq_ops = {
+       .start = ptype_seq_start,
+       .next  = ptype_seq_next,
+       .stop  = ptype_seq_stop,
+       .show  = ptype_seq_show,
+};
+
+static int ptype_seq_open(struct inode *inode, struct file *file)
+{
+       return seq_open_net(inode, file, &ptype_seq_ops,
+                       sizeof(struct seq_net_private));
+}
+
+static const struct file_operations ptype_seq_fops = {
+       .owner   = THIS_MODULE,
+       .open    = ptype_seq_open,
+       .read    = seq_read,
+       .llseek  = seq_lseek,
+       .release = seq_release_net,
+};
+
+
+static int __net_init dev_proc_net_init(struct net *net)
+{
+       int rc = -ENOMEM;
+
+       if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
+               goto out;
+       if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
+               goto out_dev;
+       if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
+               goto out_softnet;
+
+       if (wext_proc_init(net))
+               goto out_ptype;
+       rc = 0;
+out:
+       return rc;
+out_ptype:
+       proc_net_remove(net, "ptype");
+out_softnet:
+       proc_net_remove(net, "softnet_stat");
+out_dev:
+       proc_net_remove(net, "dev");
+       goto out;
+}
+
+static void __net_exit dev_proc_net_exit(struct net *net)
+{
+       wext_proc_exit(net);
+
+       proc_net_remove(net, "ptype");
+       proc_net_remove(net, "softnet_stat");
+       proc_net_remove(net, "dev");
+}
+
+static struct pernet_operations __net_initdata dev_proc_ops = {
+       .init = dev_proc_net_init,
+       .exit = dev_proc_net_exit,
+};
+
+static int __init dev_proc_init(void)
+{
+       return register_pernet_subsys(&dev_proc_ops);
+}
+#else
+#define dev_proc_init() 0
+#endif /* CONFIG_PROC_FS */
+
+
+/**
+ *     netdev_set_master       -       set up master/slave pair
+ *     @slave: slave device
+ *     @master: new master device
+ *
+ *     Changes the master device of the slave. Pass %NULL to break the
+ *     bonding. The caller must hold the RTNL semaphore. On a failure
+ *     a negative errno code is returned. On success the reference counts
+ *     are adjusted, %RTM_NEWLINK is sent to the routing socket and the
+ *     function returns zero.
+ */
+int netdev_set_master(struct net_device *slave, struct net_device *master)
+{
+       struct net_device *old = slave->master;
+
+       ASSERT_RTNL();
+
+       if (master) {
+               if (old)
+                       return -EBUSY;
+               dev_hold(master);
+       }
+
+       slave->master = master;
+
+       synchronize_net();
+
+       if (old)
+               dev_put(old);
+
+       if (master)
+               slave->flags |= IFF_SLAVE;
+       else
+               slave->flags &= ~IFF_SLAVE;
+
+       rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
+       return 0;
+}
+
+static void dev_change_rx_flags(struct net_device *dev, int flags)
+{
+       if (dev->flags & IFF_UP && dev->change_rx_flags)
+               dev->change_rx_flags(dev, flags);
+}
+
+static int __dev_set_promiscuity(struct net_device *dev, int inc)
+{
+       unsigned short old_flags = dev->flags;
+
+       ASSERT_RTNL();
+
+       dev->flags |= IFF_PROMISC;
+       dev->promiscuity += inc;
+       if (dev->promiscuity == 0) {
+               /*
+                * Avoid overflow.
+                * If inc causes overflow, untouch promisc and return error.
+                */
+               if (inc < 0)
+                       dev->flags &= ~IFF_PROMISC;
+               else {
+                       dev->promiscuity -= inc;
+                       printk(KERN_WARNING "%s: promiscuity touches roof, "
+                               "set promiscuity failed, promiscuity feature "
+                               "of device might be broken.\n", dev->name);
+                       return -EOVERFLOW;
+               }
+       }
+       if (dev->flags != old_flags) {
+               printk(KERN_INFO "device %s %s promiscuous mode\n",
+                      dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
+                                                              "left");
+               if (audit_enabled)
+                       audit_log(current->audit_context, GFP_ATOMIC,
+                               AUDIT_ANOM_PROMISCUOUS,
+                               "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
+                               dev->name, (dev->flags & IFF_PROMISC),
+                               (old_flags & IFF_PROMISC),
+                               audit_get_loginuid(current),
+                               current->uid, current->gid,
+                               audit_get_sessionid(current));
+
+               dev_change_rx_flags(dev, IFF_PROMISC);
+       }
+       return 0;
+}
+
+/**
+ *     dev_set_promiscuity     - update promiscuity count on a device
+ *     @dev: device
+ *     @inc: modifier
+ *
+ *     Add or remove promiscuity from a device. While the count in the device
+ *     remains above zero the interface remains promiscuous. Once it hits zero
+ *     the device reverts back to normal filtering operation. A negative inc
+ *     value is used to drop promiscuity on the device.
+ *     Return 0 if successful or a negative errno code on error.
+ */
+int dev_set_promiscuity(struct net_device *dev, int inc)
+{
+       unsigned short old_flags = dev->flags;
+       int err;
+
+       err = __dev_set_promiscuity(dev, inc);
+       if (err < 0)
+               return err;
+       if (dev->flags != old_flags)
+               dev_set_rx_mode(dev);
+       return err;
+}
+
+/**
+ *     dev_set_allmulti        - update allmulti count on a device
+ *     @dev: device
+ *     @inc: modifier
+ *
+ *     Add or remove reception of all multicast frames to a device. While the
+ *     count in the device remains above zero the interface remains listening
+ *     to all interfaces. Once it hits zero the device reverts back to normal
+ *     filtering operation. A negative @inc value is used to drop the counter
+ *     when releasing a resource needing all multicasts.
+ *     Return 0 if successful or a negative errno code on error.
+ */
+
+int dev_set_allmulti(struct net_device *dev, int inc)
+{
+       unsigned short old_flags = dev->flags;
+
+       ASSERT_RTNL();
+
+       dev->flags |= IFF_ALLMULTI;
+       dev->allmulti += inc;
+       if (dev->allmulti == 0) {
+               /*
+                * Avoid overflow.
+                * If inc causes overflow, untouch allmulti and return error.
+                */
+               if (inc < 0)
+                       dev->flags &= ~IFF_ALLMULTI;
+               else {
+                       dev->allmulti -= inc;
+                       printk(KERN_WARNING "%s: allmulti touches roof, "
+                               "set allmulti failed, allmulti feature of "
+                               "device might be broken.\n", dev->name);
+                       return -EOVERFLOW;
+               }
+       }
+       if (dev->flags ^ old_flags) {
+               dev_change_rx_flags(dev, IFF_ALLMULTI);
+               dev_set_rx_mode(dev);
+       }
+       return 0;
+}
+
+/*
+ *     Upload unicast and multicast address lists to device and
+ *     configure RX filtering. When the device doesn't support unicast
+ *     filtering it is put in promiscuous mode while unicast addresses
+ *     are present.
+ */
+void __dev_set_rx_mode(struct net_device *dev)
+{
+       /* dev_open will call this function so the list will stay sane. */
+       if (!(dev->flags&IFF_UP))
+               return;
+
+       if (!netif_device_present(dev))
+               return;
+
+       if (dev->set_rx_mode)
+               dev->set_rx_mode(dev);
+       else {
+               /* Unicast addresses changes may only happen under the rtnl,
+                * therefore calling __dev_set_promiscuity here is safe.
+                */
+               if (dev->uc_count > 0 && !dev->uc_promisc) {
+                       __dev_set_promiscuity(dev, 1);
+                       dev->uc_promisc = 1;
+               } else if (dev->uc_count == 0 && dev->uc_promisc) {
+                       __dev_set_promiscuity(dev, -1);
+                       dev->uc_promisc = 0;
+               }
+
+               if (dev->set_multicast_list)
+                       dev->set_multicast_list(dev);
+       }
+}
+
+void dev_set_rx_mode(struct net_device *dev)
+{
+       netif_addr_lock_bh(dev);
+       __dev_set_rx_mode(dev);
+       netif_addr_unlock_bh(dev);
+}
+
+int __dev_addr_delete(struct dev_addr_list **list, int *count,
+                     void *addr, int alen, int glbl)
+{
+       struct dev_addr_list *da;
+
+       for (; (da = *list) != NULL; list = &da->next) {
+               if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
+                   alen == da->da_addrlen) {
+                       if (glbl) {
+                               int old_glbl = da->da_gusers;
+                               da->da_gusers = 0;
+                               if (old_glbl == 0)
+                                       break;
+                       }
+                       if (--da->da_users)
+                               return 0;
+
+                       *list = da->next;
+                       kfree(da);
+                       (*count)--;
+                       return 0;
+               }
+       }
+       return -ENOENT;
+}
+
+int __dev_addr_add(struct dev_addr_list **list, int *count,
+                  void *addr, int alen, int glbl)
+{
+       struct dev_addr_list *da;
+
+       for (da = *list; da != NULL; da = da->next) {
+               if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
+                   da->da_addrlen == alen) {
+                       if (glbl) {
+                               int old_glbl = da->da_gusers;
+                               da->da_gusers = 1;
+                               if (old_glbl)
+                                       return 0;
+                       }
+                       da->da_users++;
+                       return 0;
+               }
+       }
+
+       da = kzalloc(sizeof(*da), GFP_ATOMIC);
+       if (da == NULL)
+               return -ENOMEM;
+       memcpy(da->da_addr, addr, alen);
+       da->da_addrlen = alen;
+       da->da_users = 1;
+       da->da_gusers = glbl ? 1 : 0;
+       da->next = *list;
+       *list = da;
+       (*count)++;
+       return 0;
+}
+
+/**
+ *     dev_unicast_delete      - Release secondary unicast address.
+ *     @dev: device
+ *     @addr: address to delete
+ *     @alen: length of @addr
+ *
+ *     Release reference to a secondary unicast address and remove it
+ *     from the device if the reference count drops to zero.
+ *
+ *     The caller must hold the rtnl_mutex.
+ */
+int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
+{
+       int err;
+
+       ASSERT_RTNL();
+
+       netif_addr_lock_bh(dev);
+       err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
+       if (!err)
+               __dev_set_rx_mode(dev);
+       netif_addr_unlock_bh(dev);
+       return err;
+}
+EXPORT_SYMBOL(dev_unicast_delete);
+
+/**
+ *     dev_unicast_add         - add a secondary unicast address
+ *     @dev: device
+ *     @addr: address to add
+ *     @alen: length of @addr
+ *
+ *     Add a secondary unicast address to the device or increase
+ *     the reference count if it already exists.
+ *
+ *     The caller must hold the rtnl_mutex.
+ */
+int dev_unicast_add(struct net_device *dev, void *addr, int alen)
+{
+       int err;
+
+       ASSERT_RTNL();
+
+       netif_addr_lock_bh(dev);
+       err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
+       if (!err)
+               __dev_set_rx_mode(dev);
+       netif_addr_unlock_bh(dev);
+       return err;
+}
+EXPORT_SYMBOL(dev_unicast_add);
+
+int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
+                   struct dev_addr_list **from, int *from_count)
+{
+       struct dev_addr_list *da, *next;
+       int err = 0;
+
+       da = *from;
+       while (da != NULL) {
+               next = da->next;
+               if (!da->da_synced) {
+                       err = __dev_addr_add(to, to_count,
+                                            da->da_addr, da->da_addrlen, 0);
+                       if (err < 0)
+                               break;
+                       da->da_synced = 1;
+                       da->da_users++;
+               } else if (da->da_users == 1) {
+                       __dev_addr_delete(to, to_count,
+                                         da->da_addr, da->da_addrlen, 0);
+                       __dev_addr_delete(from, from_count,
+                                         da->da_addr, da->da_addrlen, 0);
+               }
+               da = next;
+       }
+       return err;
+}
+
+void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
+                      struct dev_addr_list **from, int *from_count)
+{
+       struct dev_addr_list *da, *next;
+
+       da = *from;
+       while (da != NULL) {
+               next = da->next;
+               if (da->da_synced) {
+                       __dev_addr_delete(to, to_count,
+                                         da->da_addr, da->da_addrlen, 0);
+                       da->da_synced = 0;
+                       __dev_addr_delete(from, from_count,
+                                         da->da_addr, da->da_addrlen, 0);
+               }
+               da = next;
+       }
+}
+
+/**
+ *     dev_unicast_sync - Synchronize device's unicast list to another device
+ *     @to: destination device
+ *     @from: source device
+ *
+ *     Add newly added addresses to the destination device and release
+ *     addresses that have no users left. The source device must be
+ *     locked by netif_tx_lock_bh.
+ *
+ *     This function is intended to be called from the dev->set_rx_mode
+ *     function of layered software devices.
+ */
+int dev_unicast_sync(struct net_device *to, struct net_device *from)
+{
+       int err = 0;
+
+       netif_addr_lock_bh(to);
+       err = __dev_addr_sync(&to->uc_list, &to->uc_count,
+                             &from->uc_list, &from->uc_count);
+       if (!err)
+               __dev_set_rx_mode(to);
+       netif_addr_unlock_bh(to);
+       return err;
+}
+EXPORT_SYMBOL(dev_unicast_sync);
+
+/**
+ *     dev_unicast_unsync - Remove synchronized addresses from the destination device
+ *     @to: destination device
+ *     @from: source device
+ *
+ *     Remove all addresses that were added to the destination device by
+ *     dev_unicast_sync(). This function is intended to be called from the
+ *     dev->stop function of layered software devices.
+ */
+void dev_unicast_unsync(struct net_device *to, struct net_device *from)
+{
+       netif_addr_lock_bh(from);
+       netif_addr_lock(to);
+
+       __dev_addr_unsync(&to->uc_list, &to->uc_count,
+                         &from->uc_list, &from->uc_count);
+       __dev_set_rx_mode(to);
+
+       netif_addr_unlock(to);
+       netif_addr_unlock_bh(from);
+}
+EXPORT_SYMBOL(dev_unicast_unsync);
+
+static void __dev_addr_discard(struct dev_addr_list **list)
+{
+       struct dev_addr_list *tmp;
+
+       while (*list != NULL) {
+               tmp = *list;
+               *list = tmp->next;
+               if (tmp->da_users > tmp->da_gusers)
+                       printk("__dev_addr_discard: address leakage! "
+                              "da_users=%d\n", tmp->da_users);
+               kfree(tmp);
+       }
+}
+
+static void dev_addr_discard(struct net_device *dev)
+{
+       netif_addr_lock_bh(dev);
+
+       __dev_addr_discard(&dev->uc_list);
+       dev->uc_count = 0;
+
+       __dev_addr_discard(&dev->mc_list);
+       dev->mc_count = 0;
+
+       netif_addr_unlock_bh(dev);
+}
+
+unsigned dev_get_flags(const struct net_device *dev)
+{
+       unsigned flags;
+
+       flags = (dev->flags & ~(IFF_PROMISC |
+                               IFF_ALLMULTI |
+                               IFF_RUNNING |
+                               IFF_LOWER_UP |
+                               IFF_DORMANT)) |
+               (dev->gflags & (IFF_PROMISC |
+                               IFF_ALLMULTI));
+
+       if (netif_running(dev)) {
+               if (netif_oper_up(dev))
+                       flags |= IFF_RUNNING;
+               if (netif_carrier_ok(dev))
+                       flags |= IFF_LOWER_UP;
+               if (netif_dormant(dev))
+                       flags |= IFF_DORMANT;
+       }
+
+       return flags;
+}
+
+int dev_change_flags(struct net_device *dev, unsigned flags)
+{
+       int ret, changes;
+       int old_flags = dev->flags;
+
+       ASSERT_RTNL();
+
+       /*
+        *      Set the flags on our device.
+        */
+
+       dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
+                              IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
+                              IFF_AUTOMEDIA)) |
+                    (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
+                                   IFF_ALLMULTI));
+
+       /*
+        *      Load in the correct multicast list now the flags have changed.
+        */
+
+       if ((old_flags ^ flags) & IFF_MULTICAST)
+               dev_change_rx_flags(dev, IFF_MULTICAST);
+
+       dev_set_rx_mode(dev);
+
+       /*
+        *      Have we downed the interface. We handle IFF_UP ourselves
+        *      according to user attempts to set it, rather than blindly
+        *      setting it.
+        */
+
+       ret = 0;
+       if ((old_flags ^ flags) & IFF_UP) {     /* Bit is different  ? */
+               ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
+
+               if (!ret)
+                       dev_set_rx_mode(dev);
+       }
+
+       if (dev->flags & IFF_UP &&
+           ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
+                                         IFF_VOLATILE)))
+               call_netdevice_notifiers(NETDEV_CHANGE, dev);
+
+       if ((flags ^ dev->gflags) & IFF_PROMISC) {
+               int inc = (flags & IFF_PROMISC) ? +1 : -1;
+               dev->gflags ^= IFF_PROMISC;
+               dev_set_promiscuity(dev, inc);
+       }
+
+       /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
+          is important. Some (broken) drivers set IFF_PROMISC, when
+          IFF_ALLMULTI is requested not asking us and not reporting.
+        */
+       if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
+               int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
+               dev->gflags ^= IFF_ALLMULTI;
+               dev_set_allmulti(dev, inc);
+       }
+
+       /* Exclude state transition flags, already notified */
+       changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
+       if (changes)
+               rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
+
+       return ret;
+}
+
+int dev_set_mtu(struct net_device *dev, int new_mtu)
+{
+       int err;
+
+       if (new_mtu == dev->mtu)
+               return 0;
+
+       /*      MTU must be positive.    */
+       if (new_mtu < 0)
+               return -EINVAL;
+
+       if (!netif_device_present(dev))
+               return -ENODEV;
+
+       err = 0;
+       if (dev->change_mtu)
+               err = dev->change_mtu(dev, new_mtu);
+       else
+               dev->mtu = new_mtu;
+       if (!err && dev->flags & IFF_UP)
+               call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
+       return err;
+}
+
+int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
+{
+       int err;
+
+       if (!dev->set_mac_address)
+               return -EOPNOTSUPP;
+       if (sa->sa_family != dev->type)
+               return -EINVAL;
+       if (!netif_device_present(dev))
+               return -ENODEV;
+       err = dev->set_mac_address(dev, sa);
+       if (!err)
+               call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+       return err;
+}
+
+/*
+ *     Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
+ */
+static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
+{
+       int err;
+       struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
+
+       if (!dev)
+               return -ENODEV;
+
+       switch (cmd) {
+               case SIOCGIFFLAGS:      /* Get interface flags */
+                       ifr->ifr_flags = dev_get_flags(dev);
+                       return 0;
+
+               case SIOCGIFMETRIC:     /* Get the metric on the interface
+                                          (currently unused) */
+                       ifr->ifr_metric = 0;
+                       return 0;
+
+               case SIOCGIFMTU:        /* Get the MTU of a device */
+                       ifr->ifr_mtu = dev->mtu;
+                       return 0;
+
+               case SIOCGIFHWADDR:
+                       if (!dev->addr_len)
+                               memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
+                       else
+                               memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
+                                      min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
+                       ifr->ifr_hwaddr.sa_family = dev->type;
+                       return 0;
+
+               case SIOCGIFSLAVE:
+                       err = -EINVAL;
+                       break;
+
+               case SIOCGIFMAP:
+                       ifr->ifr_map.mem_start = dev->mem_start;
+                       ifr->ifr_map.mem_end   = dev->mem_end;
+                       ifr->ifr_map.base_addr = dev->base_addr;
+                       ifr->ifr_map.irq       = dev->irq;
+                       ifr->ifr_map.dma       = dev->dma;
+                       ifr->ifr_map.port      = dev->if_port;
+                       return 0;
+
+               case SIOCGIFINDEX:
+                       ifr->ifr_ifindex = dev->ifindex;
+                       return 0;
+
+               case SIOCGIFTXQLEN:
+                       ifr->ifr_qlen = dev->tx_queue_len;
+                       return 0;
+
+               default:
+                       /* dev_ioctl() should ensure this case
+                        * is never reached
+                        */
+                       WARN_ON(1);
+                       err = -EINVAL;
+                       break;
+
+       }
+       return err;
+}
+
+/*
+ *     Perform the SIOCxIFxxx calls, inside rtnl_lock()
+ */
+static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
+{
+       int err;
+       struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
+
+       if (!dev)
+               return -ENODEV;
+
+       switch (cmd) {
+               case SIOCSIFFLAGS:      /* Set interface flags */
+                       return dev_change_flags(dev, ifr->ifr_flags);
+
+               case SIOCSIFMETRIC:     /* Set the metric on the interface
+                                          (currently unused) */
+                       return -EOPNOTSUPP;
+
+               case SIOCSIFMTU:        /* Set the MTU of a device */
+                       return dev_set_mtu(dev, ifr->ifr_mtu);
+
+               case SIOCSIFHWADDR:
+                       return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
+
+               case SIOCSIFHWBROADCAST:
+                       if (ifr->ifr_hwaddr.sa_family != dev->type)
+                               return -EINVAL;
+                       memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
+                              min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
+                       call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+                       return 0;
+
+               case SIOCSIFMAP:
+                       if (dev->set_config) {
+                               if (!netif_device_present(dev))
+                                       return -ENODEV;
+                               return dev->set_config(dev, &ifr->ifr_map);
+                       }
+                       return -EOPNOTSUPP;
+
+               case SIOCADDMULTI:
+                       if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
+                           ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
+                               return -EINVAL;
+                       if (!netif_device_present(dev))
+                               return -ENODEV;
+                       return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
+                                         dev->addr_len, 1);
+
+               case SIOCDELMULTI:
+                       if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
+                           ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
+                               return -EINVAL;
+                       if (!netif_device_present(dev))
+                               return -ENODEV;
+                       return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
+                                            dev->addr_len, 1);
+
+               case SIOCSIFTXQLEN:
+                       if (ifr->ifr_qlen < 0)
+                               return -EINVAL;
+                       dev->tx_queue_len = ifr->ifr_qlen;
+                       return 0;
+
+               case SIOCSIFNAME:
+                       ifr->ifr_newname[IFNAMSIZ-1] = '\0';
+                       return dev_change_name(dev, ifr->ifr_newname);
+
+               /*
+                *      Unknown or private ioctl
+                */
+
+               default:
+                       if ((cmd >= SIOCDEVPRIVATE &&
+                           cmd <= SIOCDEVPRIVATE + 15) ||
+                           cmd == SIOCBONDENSLAVE ||
+                           cmd == SIOCBONDRELEASE ||
+                           cmd == SIOCBONDSETHWADDR ||
+                           cmd == SIOCBONDSLAVEINFOQUERY ||
+                           cmd == SIOCBONDINFOQUERY ||
+                           cmd == SIOCBONDCHANGEACTIVE ||
+                           cmd == SIOCGMIIPHY ||
+                           cmd == SIOCGMIIREG ||
+                           cmd == SIOCSMIIREG ||
+                           cmd == SIOCBRADDIF ||
+                           cmd == SIOCBRDELIF ||
+                           cmd == SIOCWANDEV) {
+                               err = -EOPNOTSUPP;
+                               if (dev->do_ioctl) {
+                                       if (netif_device_present(dev))
+                                               err = dev->do_ioctl(dev, ifr,
+                                                                   cmd);
+                                       else
+                                               err = -ENODEV;
+                               }
+                       } else
+                               err = -EINVAL;
+
+       }
+       return err;
+}
+
+/*
+ *     This function handles all "interface"-type I/O control requests. The actual
+ *     'doing' part of this is dev_ifsioc above.
+ */
+
+/**
+ *     dev_ioctl       -       network device ioctl
+ *     @net: the applicable net namespace
+ *     @cmd: command to issue
+ *     @arg: pointer to a struct ifreq in user space
+ *
+ *     Issue ioctl functions to devices. This is normally called by the
+ *     user space syscall interfaces but can sometimes be useful for
+ *     other purposes. The return value is the return from the syscall if
+ *     positive or a negative errno code on error.
+ */
+
+int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
+{
+       struct ifreq ifr;
+       int ret;
+       char *colon;
+
+       /* One special case: SIOCGIFCONF takes ifconf argument
+          and requires shared lock, because it sleeps writing
+          to user space.
+        */
+
+       if (cmd == SIOCGIFCONF) {
+               rtnl_lock();
+               ret = dev_ifconf(net, (char __user *) arg);
+               rtnl_unlock();
+               return ret;
+       }
+       if (cmd == SIOCGIFNAME)
+               return dev_ifname(net, (struct ifreq __user *)arg);
+
+       if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
+               return -EFAULT;
+
+       ifr.ifr_name[IFNAMSIZ-1] = 0;
+
+       colon = strchr(ifr.ifr_name, ':');
+       if (colon)
+               *colon = 0;
+
+       /*
+        *      See which interface the caller is talking about.
+        */
+
+       switch (cmd) {
+               /*
+                *      These ioctl calls:
+                *      - can be done by all.
+                *      - atomic and do not require locking.
+                *      - return a value
+                */
+               case SIOCGIFFLAGS:
+               case SIOCGIFMETRIC:
+               case SIOCGIFMTU:
+               case SIOCGIFHWADDR:
+               case SIOCGIFSLAVE:
+               case SIOCGIFMAP:
+               case SIOCGIFINDEX:
+               case SIOCGIFTXQLEN:
+                       dev_load(net, ifr.ifr_name);
+                       read_lock(&dev_base_lock);
+                       ret = dev_ifsioc_locked(net, &ifr, cmd);
+                       read_unlock(&dev_base_lock);
+                       if (!ret) {
+                               if (colon)
+                                       *colon = ':';
+                               if (copy_to_user(arg, &ifr,
+                                                sizeof(struct ifreq)))
+                                       ret = -EFAULT;
+                       }
+                       return ret;
+
+               case SIOCETHTOOL:
+                       dev_load(net, ifr.ifr_name);
+                       rtnl_lock();
+                       ret = dev_ethtool(net, &ifr);
+                       rtnl_unlock();
+                       if (!ret) {
+                               if (colon)
+                                       *colon = ':';
+                               if (copy_to_user(arg, &ifr,
+                                                sizeof(struct ifreq)))
+                                       ret = -EFAULT;
+                       }
+                       return ret;
+
+               /*
+                *      These ioctl calls:
+                *      - require superuser power.
+                *      - require strict serialization.
+                *      - return a value
+                */
+               case SIOCGMIIPHY:
+               case SIOCGMIIREG:
+               case SIOCSIFNAME:
+                       if (!capable(CAP_NET_ADMIN))
+                               return -EPERM;
+                       dev_load(net, ifr.ifr_name);
+                       rtnl_lock();
+                       ret = dev_ifsioc(net, &ifr, cmd);
+                       rtnl_unlock();
+                       if (!ret) {
+                               if (colon)
+                                       *colon = ':';
+                               if (copy_to_user(arg, &ifr,
+                                                sizeof(struct ifreq)))
+                                       ret = -EFAULT;
+                       }
+                       return ret;
+
+               /*
+                *      These ioctl calls:
+                *      - require superuser power.
+                *      - require strict serialization.
+                *      - do not return a value
+                */
+               case SIOCSIFFLAGS:
+               case SIOCSIFMETRIC:
+               case SIOCSIFMTU:
+               case SIOCSIFMAP:
+               case SIOCSIFHWADDR:
+               case SIOCSIFSLAVE:
+               case SIOCADDMULTI:
+               case SIOCDELMULTI:
+               case SIOCSIFHWBROADCAST:
+               case SIOCSIFTXQLEN:
+               case SIOCSMIIREG:
+               case SIOCBONDENSLAVE:
+               case SIOCBONDRELEASE:
+               case SIOCBONDSETHWADDR:
+               case SIOCBONDCHANGEACTIVE:
+               case SIOCBRADDIF:
+               case SIOCBRDELIF:
+                       if (!capable(CAP_NET_ADMIN))
+                               return -EPERM;
+                       /* fall through */
+               case SIOCBONDSLAVEINFOQUERY:
+               case SIOCBONDINFOQUERY:
+                       dev_load(net, ifr.ifr_name);
+                       rtnl_lock();
+                       ret = dev_ifsioc(net, &ifr, cmd);
+                       rtnl_unlock();
+                       return ret;
+
+               case SIOCGIFMEM:
+                       /* Get the per device memory space. We can add this but
+                        * currently do not support it */
+               case SIOCSIFMEM:
+                       /* Set the per device memory buffer space.
+                        * Not applicable in our case */
+               case SIOCSIFLINK:
+                       return -EINVAL;
+
+               /*
+                *      Unknown or private ioctl.
+                */
+               default:
+                       if (cmd == SIOCWANDEV ||
+                           (cmd >= SIOCDEVPRIVATE &&
+                            cmd <= SIOCDEVPRIVATE + 15)) {
+                               dev_load(net, ifr.ifr_name);
+                               rtnl_lock();
+                               ret = dev_ifsioc(net, &ifr, cmd);
+                               rtnl_unlock();
+                               if (!ret && copy_to_user(arg, &ifr,
+                                                        sizeof(struct ifreq)))
+                                       ret = -EFAULT;
+                               return ret;
+                       }
+                       /* Take care of Wireless Extensions */
+                       if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
+                               return wext_handle_ioctl(net, &ifr, cmd, arg);
+                       return -EINVAL;
+       }
+}
+
+
+/**
+ *     dev_new_index   -       allocate an ifindex
+ *     @net: the applicable net namespace
+ *
+ *     Returns a suitable unique value for a new device interface
+ *     number.  The caller must hold the rtnl semaphore or the
+ *     dev_base_lock to be sure it remains unique.
+ */
+static int dev_new_index(struct net *net)
+{
+       static int ifindex;
+       for (;;) {
+               if (++ifindex <= 0)
+                       ifindex = 1;
+               if (!__dev_get_by_index(net, ifindex))
+                       return ifindex;
+       }
+}
+
+/* Delayed registration/unregisteration */
+static LIST_HEAD(net_todo_list);
+
+static void net_set_todo(struct net_device *dev)
+{
+       list_add_tail(&dev->todo_list, &net_todo_list);
+}
+
+static void rollback_registered(struct net_device *dev)
+{
+       BUG_ON(dev_boot_phase);
+       ASSERT_RTNL();
+
+       /* Some devices call without registering for initialization unwind. */
+       if (dev->reg_state == NETREG_UNINITIALIZED) {
+               printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
+                                 "was registered\n", dev->name, dev);
+
+               WARN_ON(1);
+               return;
+       }
+
+       BUG_ON(dev->reg_state != NETREG_REGISTERED);
+
+       /* If device is running, close it first. */
+       dev_close(dev);
+
+       /* And unlink it from device chain. */
+       unlist_netdevice(dev);
+
+       dev->reg_state = NETREG_UNREGISTERING;
+
+       synchronize_net();
+
+       /* Shutdown queueing discipline. */
+       dev_shutdown(dev);
+
+
+       /* Notify protocols, that we are about to destroy
+          this device. They should clean all the things.
+       */
+       call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
+
+       /*
+        *      Flush the unicast and multicast chains
+        */
+       dev_addr_discard(dev);
+
+       if (dev->uninit)
+               dev->uninit(dev);
+
+       /* Notifier chain MUST detach us from master device. */
+       WARN_ON(dev->master);
+
+       /* Remove entries from kobject tree */
+       netdev_unregister_kobject(dev);
+
+       synchronize_net();
+
+       dev_put(dev);
+}
+
+static void __netdev_init_queue_locks_one(struct net_device *dev,
+                                         struct netdev_queue *dev_queue,
+                                         void *_unused)
+{
+       spin_lock_init(&dev_queue->_xmit_lock);
+       netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
+       dev_queue->xmit_lock_owner = -1;
+}
+
+static void netdev_init_queue_locks(struct net_device *dev)
+{
+       netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
+       __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
+}
+
+/**
+ *     register_netdevice      - register a network device
+ *     @dev: device to register
+ *
+ *     Take a completed network device structure and add it to the kernel
+ *     interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
+ *     chain. 0 is returned on success. A negative errno code is returned
+ *     on a failure to set up the device, or if the name is a duplicate.
+ *
+ *     Callers must hold the rtnl semaphore. You may want
+ *     register_netdev() instead of this.
+ *
+ *     BUGS:
+ *     The locking appears insufficient to guarantee two parallel registers
+ *     will not get the same name.
+ */
+
+int register_netdevice(struct net_device *dev)
+{
+       struct hlist_head *head;
+       struct hlist_node *p;
+       int ret;
+       struct net *net;
+
+       BUG_ON(dev_boot_phase);
+       ASSERT_RTNL();
+
+       might_sleep();
+
+       /* When net_device's are persistent, this will be fatal. */
+       BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
+       BUG_ON(!dev_net(dev));
+       net = dev_net(dev);
+
+       spin_lock_init(&dev->addr_list_lock);
+       netdev_set_addr_lockdep_class(dev);
+       netdev_init_queue_locks(dev);
+
+       dev->iflink = -1;
+
+       /* Init, if this function is available */
+       if (dev->init) {
+               ret = dev->init(dev);
+               if (ret) {
+                       if (ret > 0)
+                               ret = -EIO;
+                       goto out;
+               }
+       }
+
+       if (!dev_valid_name(dev->name)) {
+               ret = -EINVAL;
+               goto err_uninit;
+       }
+
+       dev->ifindex = dev_new_index(net);
+       if (dev->iflink == -1)
+               dev->iflink = dev->ifindex;
+
+       /* Check for existence of name */
+       head = dev_name_hash(net, dev->name);
+       hlist_for_each(p, head) {
+               struct net_device *d
+                       = hlist_entry(p, struct net_device, name_hlist);
+               if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
+                       ret = -EEXIST;
+                       goto err_uninit;
+               }
+       }
+
+       /* Fix illegal checksum combinations */
+       if ((dev->features & NETIF_F_HW_CSUM) &&
+           (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
+               printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
+                      dev->name);
+               dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
+       }
+
+       if ((dev->features & NETIF_F_NO_CSUM) &&
+           (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
+               printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
+                      dev->name);
+               dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
+       }
+
+
+       /* Fix illegal SG+CSUM combinations. */
+       if ((dev->features & NETIF_F_SG) &&
+           !(dev->features & NETIF_F_ALL_CSUM)) {
+               printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
+                      dev->name);
+               dev->features &= ~NETIF_F_SG;
+       }
+
+       /* TSO requires that SG is present as well. */
+       if ((dev->features & NETIF_F_TSO) &&
+           !(dev->features & NETIF_F_SG)) {
+               printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
+                      dev->name);
+               dev->features &= ~NETIF_F_TSO;
+       }
+       if (dev->features & NETIF_F_UFO) {
+               if (!(dev->features & NETIF_F_GEN_CSUM)) {
+                       printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
+                                       "NETIF_F_HW_CSUM feature.\n",
+                                                       dev->name);
+                       dev->features &= ~NETIF_F_UFO;
+               }
+               if (!(dev->features & NETIF_F_SG)) {
+                       printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
+                                       "NETIF_F_SG feature.\n",
+                                       dev->name);
+                       dev->features &= ~NETIF_F_UFO;
+               }
+       }
+
+       /* Enable software GSO if SG is supported. */
+       if (dev->features & NETIF_F_SG)
+               dev->features |= NETIF_F_GSO;
+
+       netdev_initialize_kobject(dev);
+       ret = netdev_register_kobject(dev);
+       if (ret)
+               goto err_uninit;
+       dev->reg_state = NETREG_REGISTERED;
+
+       /*
+        *      Default initial state at registry is that the
+        *      device is present.
+        */
+
+       set_bit(__LINK_STATE_PRESENT, &dev->state);
+
+       dev_init_scheduler(dev);
+       dev_hold(dev);
+       list_netdevice(dev);
+
+       /* Notify protocols, that a new device appeared. */
+       ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
+       ret = notifier_to_errno(ret);
+       if (ret) {
+               rollback_registered(dev);
+               dev->reg_state = NETREG_UNREGISTERED;
+       }
+
+out:
+       return ret;
+
+err_uninit:
+       if (dev->uninit)
+               dev->uninit(dev);
+       goto out;
+}
+
+/**
+ *     register_netdev - register a network device
+ *     @dev: device to register
+ *
+ *     Take a completed network device structure and add it to the kernel
+ *     interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
+ *     chain. 0 is returned on success. A negative errno code is returned
+ *     on a failure to set up the device, or if the name is a duplicate.
+ *
+ *     This is a wrapper around register_netdevice that takes the rtnl semaphore
+ *     and expands the device name if you passed a format string to
+ *     alloc_netdev.
+ */
+int register_netdev(struct net_device *dev)
+{
+       int err;
+
+       rtnl_lock();
+
+       /*
+        * If the name is a format string the caller wants us to do a
+        * name allocation.
+        */
+       if (strchr(dev->name, '%')) {
+               err = dev_alloc_name(dev, dev->name);
+               if (err < 0)
+                       goto out;
+       }
+
+       err = register_netdevice(dev);
+out:
+       rtnl_unlock();
+       return err;
+}
+EXPORT_SYMBOL(register_netdev);
+
+/*
+ * netdev_wait_allrefs - wait until all references are gone.
+ *
+ * This is called when unregistering network devices.
+ *
+ * Any protocol or device that holds a reference should register
+ * for netdevice notification, and cleanup and put back the
+ * reference if they receive an UNREGISTER event.
+ * We can get stuck here if buggy protocols don't correctly
+ * call dev_put.
+ */
+static void netdev_wait_allrefs(struct net_device *dev)
+{
+       unsigned long rebroadcast_time, warning_time;
+
+       rebroadcast_time = warning_time = jiffies;
+       while (atomic_read(&dev->refcnt) != 0) {
+               if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
+                       rtnl_lock();
+
+                       /* Rebroadcast unregister notification */
+                       call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
+
+                       if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
+                                    &dev->state)) {
+                               /* We must not have linkwatch events
+                                * pending on unregister. If this
+                                * happens, we simply run the queue
+                                * unscheduled, resulting in a noop
+                                * for this device.
+                                */
+                               linkwatch_run_queue();
+                       }
+
+                       __rtnl_unlock();
+
+                       rebroadcast_time = jiffies;
+               }
+
+               msleep(250);
+
+               if (time_after(jiffies, warning_time + 10 * HZ)) {
+                       printk(KERN_EMERG "unregister_netdevice: "
+                              "waiting for %s to become free. Usage "
+                              "count = %d\n",
+                              dev->name, atomic_read(&dev->refcnt));
+                       warning_time = jiffies;
+               }
+       }
+}
+
+/* The sequence is:
+ *
+ *     rtnl_lock();
+ *     ...
+ *     register_netdevice(x1);
+ *     register_netdevice(x2);
+ *     ...
+ *     unregister_netdevice(y1);
+ *     unregister_netdevice(y2);
+ *      ...
+ *     rtnl_unlock();
+ *     free_netdev(y1);
+ *     free_netdev(y2);
+ *
+ * We are invoked by rtnl_unlock().
+ * This allows us to deal with problems:
+ * 1) We can delete sysfs objects which invoke hotplug
+ *    without deadlocking with linkwatch via keventd.
+ * 2) Since we run with the RTNL semaphore not held, we can sleep
+ *    safely in order to wait for the netdev refcnt to drop to zero.
+ *
+ * We must not return until all unregister events added during
+ * the interval the lock was held have been completed.
+ */
+void netdev_run_todo(void)
+{
+       struct list_head list;
+
+       /* Snapshot list, allow later requests */
+       list_replace_init(&net_todo_list, &list);
+
+       __rtnl_unlock();
+
+       while (!list_empty(&list)) {
+               struct net_device *dev
+                       = list_entry(list.next, struct net_device, todo_list);
+               list_del(&dev->todo_list);
+
+               if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
+                       printk(KERN_ERR "network todo '%s' but state %d\n",
+                              dev->name, dev->reg_state);
+                       dump_stack();
+                       continue;
+               }
+
+               dev->reg_state = NETREG_UNREGISTERED;
+
+               on_each_cpu(flush_backlog, dev, 1);
+
+               netdev_wait_allrefs(dev);
+
+               /* paranoia */
+               BUG_ON(atomic_read(&dev->refcnt));
+               WARN_ON(dev->ip_ptr);
+               WARN_ON(dev->ip6_ptr);
+               WARN_ON(dev->dn_ptr);
+
+               if (dev->destructor)
+                       dev->destructor(dev);
+
+               /* Free network device */
+               kobject_put(&dev->dev.kobj);
+       }
+}
+
+static struct net_device_stats *internal_stats(struct net_device *dev)
+{
+       return &dev->stats;
+}
+
+static void netdev_init_one_queue(struct net_device *dev,
+                                 struct netdev_queue *queue,
+                                 void *_unused)
+{
+       queue->dev = dev;
+}
+
+static void netdev_init_queues(struct net_device *dev)
+{
+       netdev_init_one_queue(dev, &dev->rx_queue, NULL);
+       netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
+       spin_lock_init(&dev->tx_global_lock);
+}
+
+/**
+ *     alloc_netdev_mq - allocate network device
+ *     @sizeof_priv:   size of private data to allocate space for
+ *     @name:          device name format string
+ *     @setup:         callback to initialize device
+ *     @queue_count:   the number of subqueues to allocate
+ *
+ *     Allocates a struct net_device with private data area for driver use
+ *     and performs basic initialization.  Also allocates subquue structs
+ *     for each queue on the device at the end of the netdevice.
+ */
+struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
+               void (*setup)(struct net_device *), unsigned int queue_count)
+{
+       struct netdev_queue *tx;
+       struct net_device *dev;
+       size_t alloc_size;
+       void *p;
+
+       BUG_ON(strlen(name) >= sizeof(dev->name));
+
+       alloc_size = sizeof(struct net_device);
+       if (sizeof_priv) {
+               /* ensure 32-byte alignment of private area */
+               alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
+               alloc_size += sizeof_priv;
+       }
+       /* ensure 32-byte alignment of whole construct */
+       alloc_size += NETDEV_ALIGN_CONST;
+
+       p = kzalloc(alloc_size, GFP_KERNEL);
+       if (!p) {
+               printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
+               return NULL;
+       }
+
+       tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
+       if (!tx) {
+               printk(KERN_ERR "alloc_netdev: Unable to allocate "
+                      "tx qdiscs.\n");
+               kfree(p);
+               return NULL;
+       }
+
+       dev = (struct net_device *)
+               (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
+       dev->padded = (char *)dev - (char *)p;
+       dev_net_set(dev, &init_net);
+
+       dev->_tx = tx;
+       dev->num_tx_queues = queue_count;
+       dev->real_num_tx_queues = queue_count;
+
+       if (sizeof_priv) {
+               dev->priv = ((char *)dev +
+                            ((sizeof(struct net_device) + NETDEV_ALIGN_CONST)
+                             & ~NETDEV_ALIGN_CONST));
+       }
+
+       dev->gso_max_size = GSO_MAX_SIZE;
+
+       netdev_init_queues(dev);
+
+       dev->get_stats = internal_stats;
+       netpoll_netdev_init(dev);
+       setup(dev);
+       strcpy(dev->name, name);
+       return dev;
+}
+EXPORT_SYMBOL(alloc_netdev_mq);
+
+/**
+ *     free_netdev - free network device
+ *     @dev: device
+ *
+ *     This function does the last stage of destroying an allocated device
+ *     interface. The reference to the device object is released.
+ *     If this is the last reference then it will be freed.
+ */
+void free_netdev(struct net_device *dev)
+{
+       release_net(dev_net(dev));
+
+       kfree(dev->_tx);
+
+       /*  Compatibility with error handling in drivers */
+       if (dev->reg_state == NETREG_UNINITIALIZED) {
+               kfree((char *)dev - dev->padded);
+               return;
+       }
+
+       BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
+       dev->reg_state = NETREG_RELEASED;
+
+       /* will free via device release */
+       put_device(&dev->dev);
+}
+
+/* Synchronize with packet receive processing. */
+void synchronize_net(void)
+{
+       might_sleep();
+       synchronize_rcu();
+}
+
+/**
+ *     unregister_netdevice - remove device from the kernel
+ *     @dev: device
+ *
+ *     This function shuts down a device interface and removes it
+ *     from the kernel tables.
+ *
+ *     Callers must hold the rtnl semaphore.  You may want
+ *     unregister_netdev() instead of this.
+ */
+
+void unregister_netdevice(struct net_device *dev)
+{
+       ASSERT_RTNL();
+
+       rollback_registered(dev);
+       /* Finish processing unregister after unlock */
+       net_set_todo(dev);
+}
+
+/**
+ *     unregister_netdev - remove device from the kernel
+ *     @dev: device
+ *
+ *     This function shuts down a device interface and removes it
+ *     from the kernel tables.
+ *
+ *     This is just a wrapper for unregister_netdevice that takes
+ *     the rtnl semaphore.  In general you want to use this and not
+ *     unregister_netdevice.
+ */
+void unregister_netdev(struct net_device *dev)
+{
+       rtnl_lock();
+       unregister_netdevice(dev);
+       rtnl_unlock();
+}
+
+EXPORT_SYMBOL(unregister_netdev);
+
+/**
+ *     dev_change_net_namespace - move device to different nethost namespace
+ *     @dev: device
+ *     @net: network namespace
+ *     @pat: If not NULL name pattern to try if the current device name
+ *           is already taken in the destination network namespace.
+ *
+ *     This function shuts down a device interface and moves it
+ *     to a new network namespace. On success 0 is returned, on
+ *     a failure a netagive errno code is returned.
+ *
+ *     Callers must hold the rtnl semaphore.
+ */
+
+int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
+{
+       char buf[IFNAMSIZ];
+       const char *destname;
+       int err;
+
+       ASSERT_RTNL();
+
+       /* Don't allow namespace local devices to be moved. */
+       err = -EINVAL;
+       if (dev->features & NETIF_F_NETNS_LOCAL)
+               goto out;
+
+#ifdef CONFIG_SYSFS
+       /* Don't allow real devices to be moved when sysfs
+        * is enabled.
+        */
+       err = -EINVAL;
+       if (dev->dev.parent)
+               goto out;
+#endif
+
+       /* Ensure the device has been registrered */
+       err = -EINVAL;
+       if (dev->reg_state != NETREG_REGISTERED)
+               goto out;
+
+       /* Get out if there is nothing todo */
+       err = 0;
+       if (net_eq(dev_net(dev), net))
+               goto out;
+
+       /* Pick the destination device name, and ensure
+        * we can use it in the destination network namespace.
+        */
+       err = -EEXIST;
+       destname = dev->name;
+       if (__dev_get_by_name(net, destname)) {
+               /* We get here if we can't use the current device name */
+               if (!pat)
+                       goto out;
+               if (!dev_valid_name(pat))
+                       goto out;
+               if (strchr(pat, '%')) {
+                       if (__dev_alloc_name(net, pat, buf) < 0)
+                               goto out;
+                       destname = buf;
+               } else
+                       destname = pat;
+               if (__dev_get_by_name(net, destname))
+                       goto out;
+       }
+
+       /*
+        * And now a mini version of register_netdevice unregister_netdevice.
+        */
+
+       /* If device is running close it first. */
+       dev_close(dev);
+
+       /* And unlink it from device chain */
+       err = -ENODEV;
+       unlist_netdevice(dev);
+
+       synchronize_net();
+
+       /* Shutdown queueing discipline. */
+       dev_shutdown(dev);
+
+       /* Notify protocols, that we are about to destroy
+          this device. They should clean all the things.
+       */
+       call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
+
+       /*
+        *      Flush the unicast and multicast chains
+        */
+       dev_addr_discard(dev);
+
+       netdev_unregister_kobject(dev);
+
+       /* Actually switch the network namespace */
+       dev_net_set(dev, net);
+
+       /* Assign the new device name */
+       if (destname != dev->name)
+               strcpy(dev->name, destname);
+
+       /* If there is an ifindex conflict assign a new one */
+       if (__dev_get_by_index(net, dev->ifindex)) {
+               int iflink = (dev->iflink == dev->ifindex);
+               dev->ifindex = dev_new_index(net);
+               if (iflink)
+                       dev->iflink = dev->ifindex;
+       }
+
+       /* Fixup kobjects */
+       err = netdev_register_kobject(dev);
+       WARN_ON(err);
+
+       /* Add the device back in the hashes */
+       list_netdevice(dev);
+
+       /* Notify protocols, that a new device appeared. */
+       call_netdevice_notifiers(NETDEV_REGISTER, dev);
+
+       synchronize_net();
+       err = 0;
+out:
+       return err;
+}
+
+static int dev_cpu_callback(struct notifier_block *nfb,
+                           unsigned long action,
+                           void *ocpu)
+{
+       struct sk_buff **list_skb;
+       struct Qdisc **list_net;
+       struct sk_buff *skb;
+       unsigned int cpu, oldcpu = (unsigned long)ocpu;
+       struct softnet_data *sd, *oldsd;
+
+       if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
+               return NOTIFY_OK;
+
+       local_irq_disable();
+       cpu = smp_processor_id();
+       sd = &per_cpu(softnet_data, cpu);
+       oldsd = &per_cpu(softnet_data, oldcpu);
+
+       /* Find end of our completion_queue. */
+       list_skb = &sd->completion_queue;
+       while (*list_skb)
+               list_skb = &(*list_skb)->next;
+       /* Append completion queue from offline CPU. */
+       *list_skb = oldsd->completion_queue;
+       oldsd->completion_queue = NULL;
+
+       /* Find end of our output_queue. */
+       list_net = &sd->output_queue;
+       while (*list_net)
+               list_net = &(*list_net)->next_sched;
+       /* Append output queue from offline CPU. */
+       *list_net = oldsd->output_queue;
+       oldsd->output_queue = NULL;
+
+       raise_softirq_irqoff(NET_TX_SOFTIRQ);
+       local_irq_enable();
+
+       /* Process offline CPU's input_pkt_queue */
+       while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
+               netif_rx(skb);
+
+       return NOTIFY_OK;
+}
+
+#ifdef CONFIG_NET_DMA
+/**
+ * net_dma_rebalance - try to maintain one DMA channel per CPU
+ * @net_dma: DMA client and associated data (lock, channels, channel_mask)
+ *
+ * This is called when the number of channels allocated to the net_dma client
+ * changes.  The net_dma client tries to have one DMA channel per CPU.
+ */
+
+static void net_dma_rebalance(struct net_dma *net_dma)
+{
+       unsigned int cpu, i, n, chan_idx;
+       struct dma_chan *chan;
+
+       if (cpus_empty(net_dma->channel_mask)) {
+               for_each_online_cpu(cpu)
+                       rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
+               return;
+       }
+
+       i = 0;
+       cpu = first_cpu(cpu_online_map);
+
+       for_each_cpu_mask_nr(chan_idx, net_dma->channel_mask) {
+               chan = net_dma->channels[chan_idx];
+
+               n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
+                  + (i < (num_online_cpus() %
+                       cpus_weight(net_dma->channel_mask)) ? 1 : 0));
+
+               while(n) {
+                       per_cpu(softnet_data, cpu).net_dma = chan;
+                       cpu = next_cpu(cpu, cpu_online_map);
+                       n--;
+               }
+               i++;
+       }
+}
+
+/**
+ * netdev_dma_event - event callback for the net_dma_client
+ * @client: should always be net_dma_client
+ * @chan: DMA channel for the event
+ * @state: DMA state to be handled
+ */
+static enum dma_state_client
+netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
+       enum dma_state state)
+{
+       int i, found = 0, pos = -1;
+       struct net_dma *net_dma =
+               container_of(client, struct net_dma, client);
+       enum dma_state_client ack = DMA_DUP; /* default: take no action */
+
+       spin_lock(&net_dma->lock);
+       switch (state) {
+       case DMA_RESOURCE_AVAILABLE:
+               for (i = 0; i < nr_cpu_ids; i++)
+                       if (net_dma->channels[i] == chan) {
+                               found = 1;
+                               break;
+                       } else if (net_dma->channels[i] == NULL && pos < 0)
+                               pos = i;
+
+               if (!found && pos >= 0) {
+                       ack = DMA_ACK;
+                       net_dma->channels[pos] = chan;
+                       cpu_set(pos, net_dma->channel_mask);
+                       net_dma_rebalance(net_dma);
+               }
+               break;
+       case DMA_RESOURCE_REMOVED:
+               for (i = 0; i < nr_cpu_ids; i++)
+                       if (net_dma->channels[i] == chan) {
+                               found = 1;
+                               pos = i;
+                               break;
+                       }
+
+               if (found) {
+                       ack = DMA_ACK;
+                       cpu_clear(pos, net_dma->channel_mask);
+                       net_dma->channels[i] = NULL;
+                       net_dma_rebalance(net_dma);
+               }
+               break;
+       default:
+               break;
+       }
+       spin_unlock(&net_dma->lock);
+
+       return ack;
+}
+
+/**
+ * netdev_dma_regiser - register the networking subsystem as a DMA client
+ */
+static int __init netdev_dma_register(void)
+{
+       net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
+                                                               GFP_KERNEL);
+       if (unlikely(!net_dma.channels)) {
+               printk(KERN_NOTICE
+                               "netdev_dma: no memory for net_dma.channels\n");
+               return -ENOMEM;
+       }
+       spin_lock_init(&net_dma.lock);
+       dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
+       dma_async_client_register(&net_dma.client);
+       dma_async_client_chan_request(&net_dma.client);
+       return 0;
+}
+
+#else
+static int __init netdev_dma_register(void) { return -ENODEV; }
+#endif /* CONFIG_NET_DMA */
+
+/**
+ *     netdev_compute_feature - compute conjunction of two feature sets
+ *     @all: first feature set
+ *     @one: second feature set
+ *
+ *     Computes a new feature set after adding a device with feature set
+ *     @one to the master device with current feature set @all.  Returns
+ *     the new feature set.
+ */
+int netdev_compute_features(unsigned long all, unsigned long one)
+{
+       /* if device needs checksumming, downgrade to hw checksumming */
+       if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
+               all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
+
+       /* if device can't do all checksum, downgrade to ipv4/ipv6 */
+       if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
+               all ^= NETIF_F_HW_CSUM
+                       | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
+
+       if (one & NETIF_F_GSO)
+               one |= NETIF_F_GSO_SOFTWARE;
+       one |= NETIF_F_GSO;
+
+       /* If even one device supports robust GSO, enable it for all. */
+       if (one & NETIF_F_GSO_ROBUST)
+               all |= NETIF_F_GSO_ROBUST;
+
+       all &= one | NETIF_F_LLTX;
+
+       if (!(all & NETIF_F_ALL_CSUM))
+               all &= ~NETIF_F_SG;
+       if (!(all & NETIF_F_SG))
+               all &= ~NETIF_F_GSO_MASK;
+
+       return all;
+}
+EXPORT_SYMBOL(netdev_compute_features);
+
+static struct hlist_head *netdev_create_hash(void)
+{
+       int i;
+       struct hlist_head *hash;
+
+       hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
+       if (hash != NULL)
+               for (i = 0; i < NETDEV_HASHENTRIES; i++)
+                       INIT_HLIST_HEAD(&hash[i]);
+
+       return hash;
+}
+
+/* Initialize per network namespace state */
+static int __net_init netdev_init(struct net *net)
+{
+       INIT_LIST_HEAD(&net->dev_base_head);
+
+       net->dev_name_head = netdev_create_hash();
+       if (net->dev_name_head == NULL)
+               goto err_name;
+
+       net->dev_index_head = netdev_create_hash();
+       if (net->dev_index_head == NULL)
+               goto err_idx;
+
+       return 0;
+
+err_idx:
+       kfree(net->dev_name_head);
+err_name:
+       return -ENOMEM;
+}
+
+char *netdev_drivername(struct net_device *dev, char *buffer, int len)
+{
+       struct device_driver *driver;
+       struct device *parent;
+
+       if (len <= 0 || !buffer)
+               return buffer;
+       buffer[0] = 0;
+
+       parent = dev->dev.parent;
+
+       if (!parent)
+               return buffer;
+
+       driver = parent->driver;
+       if (driver && driver->name)
+               strlcpy(buffer, driver->name, len);
+       return buffer;
+}
+
+static void __net_exit netdev_exit(struct net *net)
+{
+       kfree(net->dev_name_head);
+       kfree(net->dev_index_head);
+}
+
+static struct pernet_operations __net_initdata netdev_net_ops = {
+       .init = netdev_init,
+       .exit = netdev_exit,
+};
+
+static void __net_exit default_device_exit(struct net *net)
+{
+       struct net_device *dev, *next;
+       /*
+        * Push all migratable of the network devices back to the
+        * initial network namespace
+        */
+       rtnl_lock();
+       for_each_netdev_safe(net, dev, next) {
+               int err;
+               char fb_name[IFNAMSIZ];
+
+               /* Ignore unmoveable devices (i.e. loopback) */
+               if (dev->features & NETIF_F_NETNS_LOCAL)
+                       continue;
+
+               /* Push remaing network devices to init_net */
+               snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
+               err = dev_change_net_namespace(dev, &init_net, fb_name);
+               if (err) {
+                       printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
+                               __func__, dev->name, err);
+                       BUG();
+               }
+       }
+       rtnl_unlock();
+}
+
+static struct pernet_operations __net_initdata default_device_ops = {
+       .exit = default_device_exit,
+};
+
+/*
+ *     Initialize the DEV module. At boot time this walks the device list and
+ *     unhooks any devices that fail to initialise (normally hardware not
+ *     present) and leaves us with a valid list of present and active devices.
+ *
+ */
+
+/*
+ *       This is called single threaded during boot, so no need
+ *       to take the rtnl semaphore.
+ */
+static int __init net_dev_init(void)
+{
+       int i, rc = -ENOMEM;
+
+       BUG_ON(!dev_boot_phase);
+
+       if (dev_proc_init())
+               goto out;
+
+       if (netdev_kobject_init())
+               goto out;
+
+       INIT_LIST_HEAD(&ptype_all);
+       for (i = 0; i < PTYPE_HASH_SIZE; i++)
+               INIT_LIST_HEAD(&ptype_base[i]);
+
+       if (register_pernet_subsys(&netdev_net_ops))
+               goto out;
+
+       if (register_pernet_device(&default_device_ops))
+               goto out;
+
+       /*
+        *      Initialise the packet receive queues.
+        */
+
+       for_each_possible_cpu(i) {
+               struct softnet_data *queue;
+
+               queue = &per_cpu(softnet_data, i);
+               skb_queue_head_init(&queue->input_pkt_queue);
+               queue->completion_queue = NULL;
+               INIT_LIST_HEAD(&queue->poll_list);
+
+               queue->backlog.poll = process_backlog;
+               queue->backlog.weight = weight_p;
+       }
+
+       netdev_dma_register();
+
+       dev_boot_phase = 0;
+
+       open_softirq(NET_TX_SOFTIRQ, net_tx_action);
+       open_softirq(NET_RX_SOFTIRQ, net_rx_action);
+
+       hotcpu_notifier(dev_cpu_callback, 0);
+       dst_init();
+       dev_mcast_init();
+       rc = 0;
+out:
+       return rc;
+}
+
+subsys_initcall(net_dev_init);
+
+EXPORT_SYMBOL(__dev_get_by_index);
+EXPORT_SYMBOL(__dev_get_by_name);
+EXPORT_SYMBOL(__dev_remove_pack);
+EXPORT_SYMBOL(dev_valid_name);
+EXPORT_SYMBOL(dev_add_pack);
+EXPORT_SYMBOL(dev_alloc_name);
+EXPORT_SYMBOL(dev_close);
+EXPORT_SYMBOL(dev_get_by_flags);
+EXPORT_SYMBOL(dev_get_by_index);
+EXPORT_SYMBOL(dev_get_by_name);
+EXPORT_SYMBOL(dev_open);
+EXPORT_SYMBOL(dev_ioctl);
+EXPORT_SYMBOL(dev_queue_xmit);
+EXPORT_SYMBOL(dev_remove_pack);
+EXPORT_SYMBOL(dev_set_allmulti);
+EXPORT_SYMBOL(dev_set_promiscuity);
+EXPORT_SYMBOL(dev_change_flags);
+EXPORT_SYMBOL(dev_set_mtu);
+EXPORT_SYMBOL(dev_set_mac_address);
+EXPORT_SYMBOL(free_netdev);
+EXPORT_SYMBOL(netdev_boot_setup_check);
+EXPORT_SYMBOL(netdev_set_master);
+EXPORT_SYMBOL(netdev_state_change);
+EXPORT_SYMBOL(netif_receive_skb);
+EXPORT_SYMBOL(__netif_receive_skb);
+EXPORT_SYMBOL(netif_rx);
+EXPORT_SYMBOL(register_gifconf);
+EXPORT_SYMBOL(register_netdevice);
+EXPORT_SYMBOL(register_netdevice_notifier);
+
+/* Click */
+EXPORT_SYMBOL(register_net_in);
+EXPORT_SYMBOL(unregister_net_in);
+
+EXPORT_SYMBOL(skb_checksum_help);
+EXPORT_SYMBOL(synchronize_net);
+EXPORT_SYMBOL(unregister_netdevice);
+EXPORT_SYMBOL(unregister_netdevice_notifier);
+EXPORT_SYMBOL(net_enable_timestamp);
+EXPORT_SYMBOL(net_disable_timestamp);
+EXPORT_SYMBOL(dev_get_flags);
+
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
+EXPORT_SYMBOL(br_handle_frame_hook);
+EXPORT_SYMBOL(br_fdb_get_hook);
+EXPORT_SYMBOL(br_fdb_put_hook);
+#endif
+
+#ifdef CONFIG_KMOD
+EXPORT_SYMBOL(dev_load);
+#endif
+
+EXPORT_PER_CPU_SYMBOL(softnet_data);