net: move ioctl functions into a separated file
authorCong Wang <xiyou.wangcong@gmail.com>
Fri, 15 Feb 2013 22:20:46 +0000 (22:20 +0000)
committerDavid S. Miller <davem@davemloft.net>
Mon, 18 Feb 2013 17:27:32 +0000 (12:27 -0500)
They well deserve a separated unit.

Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/Makefile
net/core/dev.c
net/core/dev_ioctl.c [new file with mode: 0644]

index 674641b13aea341257094fa4f070bd4289075d9b..0c5e3618c80be7ef8d57c5f81747421d63b8da1b 100644 (file)
@@ -9,7 +9,7 @@ obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
 
 obj-y               += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \
                        neighbour.o rtnetlink.o utils.o link_watch.o filter.o \
-                       sock_diag.o
+                       sock_diag.o dev_ioctl.o
 
 obj-$(CONFIG_XFRM) += flow.o
 obj-y += net-sysfs.o
index 6ad37896a324612ddbd0722dbe4f03f74a0584d7..1932d351ed7c5e6ca24612b26bcf576458834f12 100644 (file)
 #include <net/xfrm.h>
 #include <linux/highmem.h>
 #include <linux/init.h>
-#include <linux/kmod.h>
 #include <linux/module.h>
 #include <linux/netpoll.h>
 #include <linux/rcupdate.h>
 #include <linux/pci.h>
 #include <linux/inetdevice.h>
 #include <linux/cpu_rmap.h>
-#include <linux/net_tstamp.h>
 #include <linux/static_key.h>
 
 #include "net-sysfs.h"
@@ -1226,36 +1224,6 @@ void netdev_notify_peers(struct net_device *dev)
 }
 EXPORT_SYMBOL(netdev_notify_peers);
 
-/**
- *     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;
-       int no_module;
-
-       rcu_read_lock();
-       dev = dev_get_by_name_rcu(net, name);
-       rcu_read_unlock();
-
-       no_module = !dev;
-       if (no_module && capable(CAP_NET_ADMIN))
-               no_module = request_module("netdev-%s", name);
-       if (no_module && capable(CAP_SYS_MODULE)) {
-               if (!request_module("%s", name))
-                       pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated).  Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
-                               name);
-       }
-}
-EXPORT_SYMBOL(dev_load);
-
 static int __dev_open(struct net_device *dev)
 {
        const struct net_device_ops *ops = dev->netdev_ops;
@@ -1645,57 +1613,6 @@ static inline void net_timestamp_set(struct sk_buff *skb)
                        __net_timestamp(SKB);           \
        }                                               \
 
-static int net_hwtstamp_validate(struct ifreq *ifr)
-{
-       struct hwtstamp_config cfg;
-       enum hwtstamp_tx_types tx_type;
-       enum hwtstamp_rx_filters rx_filter;
-       int tx_type_valid = 0;
-       int rx_filter_valid = 0;
-
-       if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
-               return -EFAULT;
-
-       if (cfg.flags) /* reserved for future extensions */
-               return -EINVAL;
-
-       tx_type = cfg.tx_type;
-       rx_filter = cfg.rx_filter;
-
-       switch (tx_type) {
-       case HWTSTAMP_TX_OFF:
-       case HWTSTAMP_TX_ON:
-       case HWTSTAMP_TX_ONESTEP_SYNC:
-               tx_type_valid = 1;
-               break;
-       }
-
-       switch (rx_filter) {
-       case HWTSTAMP_FILTER_NONE:
-       case HWTSTAMP_FILTER_ALL:
-       case HWTSTAMP_FILTER_SOME:
-       case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
-       case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
-       case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
-       case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
-       case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
-       case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
-       case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
-       case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
-       case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
-       case HWTSTAMP_FILTER_PTP_V2_EVENT:
-       case HWTSTAMP_FILTER_PTP_V2_SYNC:
-       case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
-               rx_filter_valid = 1;
-               break;
-       }
-
-       if (!tx_type_valid || !rx_filter_valid)
-               return -ERANGE;
-
-       return 0;
-}
-
 static inline bool is_skb_forwardable(struct net_device *dev,
                                      struct sk_buff *skb)
 {
@@ -4300,127 +4217,6 @@ softnet_break:
        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;
-}
-EXPORT_SYMBOL(register_gifconf);
-
-
-/*
- *     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;
-       unsigned seq;
-
-       /*
-        *      Fetch the caller's info block.
-        */
-
-       if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
-               return -EFAULT;
-
-retry:
-       seq = read_seqcount_begin(&devnet_rename_seq);
-       rcu_read_lock();
-       dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
-       if (!dev) {
-               rcu_read_unlock();
-               return -ENODEV;
-       }
-
-       strcpy(ifr.ifr_name, dev->name);
-       rcu_read_unlock();
-       if (read_seqcount_retry(&devnet_rename_seq, seq))
-               goto retry;
-
-       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) {
-               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
 
 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
@@ -5381,375 +5177,6 @@ int dev_change_carrier(struct net_device *dev, bool new_carrier)
 }
 EXPORT_SYMBOL(dev_change_carrier);
 
-/*
- *     Perform the SIOCxIFxxx calls, inside rcu_read_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_rcu(net, ifr->ifr_name);
-
-       if (!dev)
-               return -ENODEV;
-
-       switch (cmd) {
-       case SIOCGIFFLAGS:      /* Get interface flags */
-               ifr->ifr_flags = (short) 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 = -ENOTTY;
-               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);
-       const struct net_device_ops *ops;
-
-       if (!dev)
-               return -ENODEV;
-
-       ops = dev->netdev_ops;
-
-       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 (ops->ndo_set_config) {
-                       if (!netif_device_present(dev))
-                               return -ENODEV;
-                       return ops->ndo_set_config(dev, &ifr->ifr_map);
-               }
-               return -EOPNOTSUPP;
-
-       case SIOCADDMULTI:
-               if (!ops->ndo_set_rx_mode ||
-                   ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
-                       return -EINVAL;
-               if (!netif_device_present(dev))
-                       return -ENODEV;
-               return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
-
-       case SIOCDELMULTI:
-               if (!ops->ndo_set_rx_mode ||
-                   ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
-                       return -EINVAL;
-               if (!netif_device_present(dev))
-                       return -ENODEV;
-               return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
-
-       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);
-
-       case SIOCSHWTSTAMP:
-               err = net_hwtstamp_validate(ifr);
-               if (err)
-                       return err;
-               /* fall through */
-
-       /*
-        *      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 == SIOCSHWTSTAMP ||
-                   cmd == SIOCWANDEV) {
-                       err = -EOPNOTSUPP;
-                       if (ops->ndo_do_ioctl) {
-                               if (netif_device_present(dev))
-                                       err = ops->ndo_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);
-               rcu_read_lock();
-               ret = dev_ifsioc_locked(net, &ifr, cmd);
-               rcu_read_unlock();
-               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 (!ns_capable(net->user_ns, 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 SIOCSIFMAP:
-       case SIOCSIFTXQLEN:
-               if (!capable(CAP_NET_ADMIN))
-                       return -EPERM;
-               /* fall through */
-       /*
-        *      These ioctl calls:
-        *      - require local superuser power.
-        *      - require strict serialization.
-        *      - do not return a value
-        */
-       case SIOCSIFFLAGS:
-       case SIOCSIFMETRIC:
-       case SIOCSIFMTU:
-       case SIOCSIFHWADDR:
-       case SIOCSIFSLAVE:
-       case SIOCADDMULTI:
-       case SIOCDELMULTI:
-       case SIOCSIFHWBROADCAST:
-       case SIOCSMIIREG:
-       case SIOCBONDENSLAVE:
-       case SIOCBONDRELEASE:
-       case SIOCBONDSETHWADDR:
-       case SIOCBONDCHANGEACTIVE:
-       case SIOCBRADDIF:
-       case SIOCBRDELIF:
-       case SIOCSHWTSTAMP:
-               if (!ns_capable(net->user_ns, 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 -ENOTTY;
-
-       /*
-        *      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 -ENOTTY;
-       }
-}
-
-
 /**
  *     dev_new_index   -       allocate an ifindex
  *     @net: the applicable net namespace
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
new file mode 100644 (file)
index 0000000..6cc0481
--- /dev/null
@@ -0,0 +1,576 @@
+#include <linux/kmod.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/net_tstamp.h>
+#include <linux/wireless.h>
+#include <net/wext.h>
+
+/*
+ *     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;
+       unsigned seq;
+
+       /*
+        *      Fetch the caller's info block.
+        */
+
+       if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
+               return -EFAULT;
+
+retry:
+       seq = read_seqcount_begin(&devnet_rename_seq);
+       rcu_read_lock();
+       dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
+       if (!dev) {
+               rcu_read_unlock();
+               return -ENODEV;
+       }
+
+       strcpy(ifr.ifr_name, dev->name);
+       rcu_read_unlock();
+       if (read_seqcount_retry(&devnet_rename_seq, seq))
+               goto retry;
+
+       if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
+               return -EFAULT;
+       return 0;
+}
+
+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;
+}
+EXPORT_SYMBOL(register_gifconf);
+
+/*
+ *     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) {
+               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;
+}
+
+/*
+ *     Perform the SIOCxIFxxx calls, inside rcu_read_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_rcu(net, ifr->ifr_name);
+
+       if (!dev)
+               return -ENODEV;
+
+       switch (cmd) {
+       case SIOCGIFFLAGS:      /* Get interface flags */
+               ifr->ifr_flags = (short) 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 = -ENOTTY;
+               break;
+
+       }
+       return err;
+}
+
+static int net_hwtstamp_validate(struct ifreq *ifr)
+{
+       struct hwtstamp_config cfg;
+       enum hwtstamp_tx_types tx_type;
+       enum hwtstamp_rx_filters rx_filter;
+       int tx_type_valid = 0;
+       int rx_filter_valid = 0;
+
+       if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
+               return -EFAULT;
+
+       if (cfg.flags) /* reserved for future extensions */
+               return -EINVAL;
+
+       tx_type = cfg.tx_type;
+       rx_filter = cfg.rx_filter;
+
+       switch (tx_type) {
+       case HWTSTAMP_TX_OFF:
+       case HWTSTAMP_TX_ON:
+       case HWTSTAMP_TX_ONESTEP_SYNC:
+               tx_type_valid = 1;
+               break;
+       }
+
+       switch (rx_filter) {
+       case HWTSTAMP_FILTER_NONE:
+       case HWTSTAMP_FILTER_ALL:
+       case HWTSTAMP_FILTER_SOME:
+       case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+       case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+       case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+       case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+       case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+       case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+       case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+       case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+       case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+       case HWTSTAMP_FILTER_PTP_V2_EVENT:
+       case HWTSTAMP_FILTER_PTP_V2_SYNC:
+       case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+               rx_filter_valid = 1;
+               break;
+       }
+
+       if (!tx_type_valid || !rx_filter_valid)
+               return -ERANGE;
+
+       return 0;
+}
+
+/*
+ *     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);
+       const struct net_device_ops *ops;
+
+       if (!dev)
+               return -ENODEV;
+
+       ops = dev->netdev_ops;
+
+       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 (ops->ndo_set_config) {
+                       if (!netif_device_present(dev))
+                               return -ENODEV;
+                       return ops->ndo_set_config(dev, &ifr->ifr_map);
+               }
+               return -EOPNOTSUPP;
+
+       case SIOCADDMULTI:
+               if (!ops->ndo_set_rx_mode ||
+                   ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
+                       return -EINVAL;
+               if (!netif_device_present(dev))
+                       return -ENODEV;
+               return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
+
+       case SIOCDELMULTI:
+               if (!ops->ndo_set_rx_mode ||
+                   ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
+                       return -EINVAL;
+               if (!netif_device_present(dev))
+                       return -ENODEV;
+               return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
+
+       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);
+
+       case SIOCSHWTSTAMP:
+               err = net_hwtstamp_validate(ifr);
+               if (err)
+                       return err;
+               /* fall through */
+
+       /*
+        *      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 == SIOCSHWTSTAMP ||
+                   cmd == SIOCWANDEV) {
+                       err = -EOPNOTSUPP;
+                       if (ops->ndo_do_ioctl) {
+                               if (netif_device_present(dev))
+                                       err = ops->ndo_do_ioctl(dev, ifr, cmd);
+                               else
+                                       err = -ENODEV;
+                       }
+               } else
+                       err = -EINVAL;
+
+       }
+       return err;
+}
+
+/**
+ *     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;
+       int no_module;
+
+       rcu_read_lock();
+       dev = dev_get_by_name_rcu(net, name);
+       rcu_read_unlock();
+
+       no_module = !dev;
+       if (no_module && capable(CAP_NET_ADMIN))
+               no_module = request_module("netdev-%s", name);
+       if (no_module && capable(CAP_SYS_MODULE)) {
+               if (!request_module("%s", name))
+                       pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated).  Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
+                               name);
+       }
+}
+EXPORT_SYMBOL(dev_load);
+
+/*
+ *     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);
+               rcu_read_lock();
+               ret = dev_ifsioc_locked(net, &ifr, cmd);
+               rcu_read_unlock();
+               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 (!ns_capable(net->user_ns, 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 SIOCSIFMAP:
+       case SIOCSIFTXQLEN:
+               if (!capable(CAP_NET_ADMIN))
+                       return -EPERM;
+               /* fall through */
+       /*
+        *      These ioctl calls:
+        *      - require local superuser power.
+        *      - require strict serialization.
+        *      - do not return a value
+        */
+       case SIOCSIFFLAGS:
+       case SIOCSIFMETRIC:
+       case SIOCSIFMTU:
+       case SIOCSIFHWADDR:
+       case SIOCSIFSLAVE:
+       case SIOCADDMULTI:
+       case SIOCDELMULTI:
+       case SIOCSIFHWBROADCAST:
+       case SIOCSMIIREG:
+       case SIOCBONDENSLAVE:
+       case SIOCBONDRELEASE:
+       case SIOCBONDSETHWADDR:
+       case SIOCBONDCHANGEACTIVE:
+       case SIOCBRADDIF:
+       case SIOCBRDELIF:
+       case SIOCSHWTSTAMP:
+               if (!ns_capable(net->user_ns, 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 -ENOTTY;
+
+       /*
+        *      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 -ENOTTY;
+       }
+}