// SPDX-License-Identifier: GPL-2.0
#include <linux/kmod.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/net_tstamp.h>
#include <linux/phylib_stubs.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/wireless.h>
#include <linux/if_bridge.h>
#include <net/dsa_stubs.h>
#include <net/netdev_lock.h>
#include <net/wext.h>

#include "dev.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 *ifr)
{
        ifr->ifr_name[IFNAMSIZ-1] = 0;
        return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
}

/*
 *      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'.
 */
int dev_ifconf(struct net *net, struct ifconf __user *uifc)
{
        struct net_device *dev;
        void __user *pos;
        size_t size;
        int len, total = 0, done;

        /* both the ifconf and the ifreq structures are slightly different */
        if (in_compat_syscall()) {
                struct compat_ifconf ifc32;

                if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
                        return -EFAULT;

                pos = compat_ptr(ifc32.ifcbuf);
                len = ifc32.ifc_len;
                size = sizeof(struct compat_ifreq);
        } else {
                struct ifconf ifc;

                if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
                        return -EFAULT;

                pos = ifc.ifc_buf;
                len = ifc.ifc_len;
                size = sizeof(struct ifreq);
        }

        /* Loop over the interfaces, and write an info block for each. */
        rtnl_net_lock(net);
        for_each_netdev(net, dev) {
                if (!pos)
                        done = inet_gifconf(dev, NULL, 0, size);
                else
                        done = inet_gifconf(dev, pos + total,
                                            len - total, size);
                if (done < 0) {
                        rtnl_net_unlock(net);
                        return -EFAULT;
                }
                total += done;
        }
        rtnl_net_unlock(net);

        return put_user(total, &uifc->ifc_len);
}

static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
{
        struct ifmap *ifmap = &ifr->ifr_map;

        if (in_compat_syscall()) {
                struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;

                cifmap->mem_start = dev->mem_start;
                cifmap->mem_end   = dev->mem_end;
                cifmap->base_addr = dev->base_addr;
                cifmap->irq       = dev->irq;
                cifmap->dma       = dev->dma;
                cifmap->port      = dev->if_port;

                return 0;
        }

        ifmap->mem_start  = dev->mem_start;
        ifmap->mem_end    = dev->mem_end;
        ifmap->base_addr  = dev->base_addr;
        ifmap->irq        = dev->irq;
        ifmap->dma        = dev->dma;
        ifmap->port       = dev->if_port;

        return 0;
}

static int netif_setifmap(struct net_device *dev, struct ifreq *ifr)
{
        struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;

        if (!dev->netdev_ops->ndo_set_config)
                return -EOPNOTSUPP;

        if (in_compat_syscall()) {
                struct ifmap ifmap = {
                        .mem_start  = cifmap->mem_start,
                        .mem_end    = cifmap->mem_end,
                        .base_addr  = cifmap->base_addr,
                        .irq        = cifmap->irq,
                        .dma        = cifmap->dma,
                        .port       = cifmap->port,
                };

                return dev->netdev_ops->ndo_set_config(dev, &ifmap);
        }

        return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
}

/*
 *      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)netif_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 SIOCGIFSLAVE:
                err = -EINVAL;
                break;

        case SIOCGIFMAP:
                return dev_getifmap(dev, ifr);

        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;
}

int net_hwtstamp_validate(const struct kernel_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 (cfg->flags & ~HWTSTAMP_FLAG_MASK)
                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:
        case HWTSTAMP_TX_ONESTEP_P2P:
                tx_type_valid = 1;
                break;
        case __HWTSTAMP_TX_CNT:
                /* not a real value */
                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:
        case HWTSTAMP_FILTER_NTP_ALL:
                rx_filter_valid = 1;
                break;
        case __HWTSTAMP_FILTER_CNT:
                /* not a real value */
                break;
        }

        if (!tx_type_valid || !rx_filter_valid)
                return -ERANGE;

        return 0;
}

/**
 * dev_get_hwtstamp_phylib() - Get hardware timestamping settings of NIC
 *      or of attached phylib PHY
 * @dev: Network device
 * @cfg: Timestamping configuration structure
 *
 * Helper for calling the default hardware provider timestamping.
 *
 * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), but
 * phydev->mii_ts has both hwtstamp_get() and hwtstamp_set() methods. So this
 * will return -EOPNOTSUPP for phylib only if hwtstamp_get() is not
 * implemented for now, which is still more accurate than letting the netdev
 * handle the GET request.
 */
int dev_get_hwtstamp_phylib(struct net_device *dev,
                            struct kernel_hwtstamp_config *cfg)
{
        struct hwtstamp_provider *hwprov;

        hwprov = netdev_ops_lock_dereference(dev->hwprov, dev);
        if (hwprov) {
                cfg->qualifier = hwprov->desc.qualifier;
                if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB &&
                    hwprov->phydev)
                        return phy_hwtstamp_get(hwprov->phydev, cfg);

                if (hwprov->source == HWTSTAMP_SOURCE_NETDEV)
                        return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);

                return -EOPNOTSUPP;
        }

        if (phy_is_default_hwtstamp(dev->phydev))
                return phy_hwtstamp_get(dev->phydev, cfg);

        return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg);
}

static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
{
        const struct net_device_ops *ops = dev->netdev_ops;
        struct kernel_hwtstamp_config kernel_cfg = {};
        struct hwtstamp_config cfg;
        int err;

        if (!ops->ndo_hwtstamp_get)
                return -EOPNOTSUPP;

        if (!netif_device_present(dev))
                return -ENODEV;

        kernel_cfg.ifr = ifr;
        netdev_lock_ops(dev);
        err = dev_get_hwtstamp_phylib(dev, &kernel_cfg);
        netdev_unlock_ops(dev);
        if (err)
                return err;

        /* If the request was resolved through an unconverted driver, omit
         * the copy_to_user(), since the implementation has already done that
         */
        if (!kernel_cfg.copied_to_user) {
                hwtstamp_config_from_kernel(&cfg, &kernel_cfg);

                if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
                        return -EFAULT;
        }

        return 0;
}

/**
 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC
 *      or of attached phylib PHY
 * @dev: Network device
 * @cfg: Timestamping configuration structure
 * @extack: Netlink extended ack message structure, for error reporting
 *
 * Helper for enforcing a common policy that phylib timestamping, if available,
 * should take precedence in front of hardware timestamping provided by the
 * netdev. If the netdev driver needs to perform specific actions even for PHY
 * timestamping to work properly (a switch port must trap the timestamped
 * frames and not forward them), it must set dev->see_all_hwtstamp_requests.
 */
int dev_set_hwtstamp_phylib(struct net_device *dev,
                            struct kernel_hwtstamp_config *cfg,
                            struct netlink_ext_ack *extack)
{
        const struct net_device_ops *ops = dev->netdev_ops;
        struct kernel_hwtstamp_config old_cfg = {};
        struct hwtstamp_provider *hwprov;
        struct phy_device *phydev;
        bool changed = false;
        bool phy_ts;
        int err;

        hwprov = netdev_ops_lock_dereference(dev->hwprov, dev);
        if (hwprov) {
                if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB &&
                    hwprov->phydev) {
                        phy_ts = true;
                        phydev = hwprov->phydev;
                } else if (hwprov->source == HWTSTAMP_SOURCE_NETDEV) {
                        phy_ts = false;
                } else {
                        return -EOPNOTSUPP;
                }

                cfg->qualifier = hwprov->desc.qualifier;
        } else {
                phy_ts = phy_is_default_hwtstamp(dev->phydev);
                if (phy_ts)
                        phydev = dev->phydev;
        }

        cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV;

        if (phy_ts && dev->see_all_hwtstamp_requests) {
                err = ops->ndo_hwtstamp_get(dev, &old_cfg);
                if (err)
                        return err;
        }

        if (!phy_ts || dev->see_all_hwtstamp_requests) {
                err = ops->ndo_hwtstamp_set(dev, cfg, extack);
                if (err) {
                        if (extack->_msg)
                                netdev_err(dev, "%s\n", extack->_msg);
                        return err;
                }
        }

        if (phy_ts && dev->see_all_hwtstamp_requests)
                changed = kernel_hwtstamp_config_changed(&old_cfg, cfg);

        if (phy_ts) {
                err = phy_hwtstamp_set(phydev, cfg, extack);
                if (err) {
                        if (changed)
                                ops->ndo_hwtstamp_set(dev, &old_cfg, NULL);
                        return err;
                }
        }

        return 0;
}

static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
{
        const struct net_device_ops *ops = dev->netdev_ops;
        struct kernel_hwtstamp_config kernel_cfg = {};
        struct netlink_ext_ack extack = {};
        struct hwtstamp_config cfg;
        int err;

        if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
                return -EFAULT;

        hwtstamp_config_to_kernel(&kernel_cfg, &cfg);
        kernel_cfg.ifr = ifr;

        err = net_hwtstamp_validate(&kernel_cfg);
        if (err)
                return err;

        err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack);
        if (err) {
                if (extack._msg)
                        netdev_err(dev, "%s\n", extack._msg);
                return err;
        }

        if (!ops->ndo_hwtstamp_set)
                return -EOPNOTSUPP;

        if (!netif_device_present(dev))
                return -ENODEV;

        netdev_lock_ops(dev);
        err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack);
        netdev_unlock_ops(dev);
        if (err)
                return err;

        /* The driver may have modified the configuration, so copy the
         * updated version of it back to user space
         */
        if (!kernel_cfg.copied_to_user) {
                hwtstamp_config_from_kernel(&cfg, &kernel_cfg);

                if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
                        return -EFAULT;
        }

        return 0;
}

int generic_hwtstamp_get_lower(struct net_device *dev,
                               struct kernel_hwtstamp_config *kernel_cfg)
{
        const struct net_device_ops *ops = dev->netdev_ops;
        int err;

        if (!netif_device_present(dev))
                return -ENODEV;

        if (!ops->ndo_hwtstamp_get)
                return -EOPNOTSUPP;

        netdev_lock_ops(dev);
        err = dev_get_hwtstamp_phylib(dev, kernel_cfg);
        netdev_unlock_ops(dev);

        return err;
}
EXPORT_SYMBOL(generic_hwtstamp_get_lower);

int generic_hwtstamp_set_lower(struct net_device *dev,
                               struct kernel_hwtstamp_config *kernel_cfg,
                               struct netlink_ext_ack *extack)
{
        const struct net_device_ops *ops = dev->netdev_ops;
        int err;

        if (!netif_device_present(dev))
                return -ENODEV;

        if (!ops->ndo_hwtstamp_set)
                return -EOPNOTSUPP;

        netdev_lock_ops(dev);
        err = dev_set_hwtstamp_phylib(dev, kernel_cfg, extack);
        netdev_unlock_ops(dev);

        return err;
}
EXPORT_SYMBOL(generic_hwtstamp_set_lower);

static int dev_siocbond(struct net_device *dev,
                        struct ifreq *ifr, unsigned int cmd)
{
        const struct net_device_ops *ops = dev->netdev_ops;

        if (ops->ndo_siocbond) {
                int ret = -ENODEV;

                netdev_lock_ops(dev);
                if (netif_device_present(dev))
                        ret = ops->ndo_siocbond(dev, ifr, cmd);
                netdev_unlock_ops(dev);

                return ret;
        }

        return -EOPNOTSUPP;
}

static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
                              void __user *data, unsigned int cmd)
{
        const struct net_device_ops *ops = dev->netdev_ops;

        if (ops->ndo_siocdevprivate) {
                int ret = -ENODEV;

                netdev_lock_ops(dev);
                if (netif_device_present(dev))
                        ret = ops->ndo_siocdevprivate(dev, ifr, data, cmd);
                netdev_unlock_ops(dev);

                return ret;
        }

        return -EOPNOTSUPP;
}

static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
{
        const struct net_device_ops *ops = dev->netdev_ops;

        if (ops->ndo_siocwandev) {
                int ret = -ENODEV;

                netdev_lock_ops(dev);
                if (netif_device_present(dev))
                        ret = ops->ndo_siocwandev(dev, ifs);
                netdev_unlock_ops(dev);

                return ret;
        }

        return -EOPNOTSUPP;
}

/*
 *      Perform the SIOCxIFxxx calls, inside rtnl_net_lock()
 */
static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
                      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, NULL);

        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:
                if (dev->addr_len > sizeof(ifr->ifr_hwaddr))
                        return -EINVAL;
                return dev_set_mac_address_user(dev,
                                                (struct sockaddr_storage *)&ifr->ifr_hwaddr,
                                                NULL);

        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));
                netdev_lock_ops(dev);
                call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
                netdev_unlock_ops(dev);
                return 0;

        case SIOCSIFMAP:
                netdev_lock_ops(dev);
                err = netif_setifmap(dev, ifr);
                netdev_unlock_ops(dev);
                return err;

        case SIOCADDMULTI:
                if ((!ops->ndo_set_rx_mode && !ops->ndo_set_rx_mode_async) ||
                    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
                        return -EINVAL;
                if (!netif_device_present(dev))
                        return -ENODEV;
                netdev_lock_ops(dev);
                err = dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
                netif_rx_mode_sync(dev);
                netdev_unlock_ops(dev);
                return err;

        case SIOCDELMULTI:
                if ((!ops->ndo_set_rx_mode && !ops->ndo_set_rx_mode_async) ||
                    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
                        return -EINVAL;
                if (!netif_device_present(dev))
                        return -ENODEV;
                netdev_lock_ops(dev);
                err = dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
                netif_rx_mode_sync(dev);
                netdev_unlock_ops(dev);
                return err;

        case SIOCSIFTXQLEN:
                if (ifr->ifr_qlen < 0)
                        return -EINVAL;
                return dev_change_tx_queue_len(dev, ifr->ifr_qlen);

        case SIOCSIFNAME:
                ifr->ifr_newname[IFNAMSIZ-1] = '\0';
                return dev_change_name(dev, ifr->ifr_newname);

        case SIOCWANDEV:
                return dev_siocwandev(dev, &ifr->ifr_settings);

        case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15:
                return dev_siocdevprivate(dev, ifr, data, cmd);

        case SIOCSHWTSTAMP:
                return dev_set_hwtstamp(dev, ifr);

        case SIOCGHWTSTAMP:
                return dev_get_hwtstamp(dev, ifr);

        case SIOCGMIIPHY:
        case SIOCGMIIREG:
        case SIOCSMIIREG:
                return dev_eth_ioctl(dev, ifr, cmd);

        case SIOCBONDENSLAVE:
        case SIOCBONDRELEASE:
        case SIOCBONDSETHWADDR:
        case SIOCBONDSLAVEINFOQUERY:
        case SIOCBONDINFOQUERY:
        case SIOCBONDCHANGEACTIVE:
                return dev_siocbond(dev, ifr, cmd);

        /* Unknown ioctl */
        default:
                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))
                request_module("%s", 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
 *      @ifr: pointer to a struct ifreq in user space
 *      @data: data exchanged with userspace
 *      @need_copyout: whether or not copy_to_user() should be called
 *
 *      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, struct ifreq *ifr,
              void __user *data, bool *need_copyout)
{
        int ret;
        char *colon;

        if (need_copyout)
                *need_copyout = true;
        if (cmd == SIOCGIFNAME)
                return dev_ifname(net, ifr);

        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) {
        case SIOCGIFHWADDR:
                dev_load(net, ifr->ifr_name);
                ret = netif_get_mac_address(&ifr->ifr_hwaddr, net,
                                            ifr->ifr_name);
                if (colon)
                        *colon = ':';
                return ret;
        /*
         *      These ioctl calls:
         *      - can be done by all.
         *      - atomic and do not require locking.
         *      - return a value
         */
        case SIOCGIFFLAGS:
        case SIOCGIFMETRIC:
        case SIOCGIFMTU:
        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 (colon)
                        *colon = ':';
                return ret;

        case SIOCETHTOOL:
                dev_load(net, ifr->ifr_name);
                ret = dev_ethtool(net, ifr, data);
                if (colon)
                        *colon = ':';
                return ret;

        /*
         *      These ioctl calls:
         *      - require superuser power.
         *      - require strict serialization.
         *      - return a value
         */
        case SIOCGMIIPHY:
        case SIOCGMIIREG:
        case SIOCSIFNAME:
                dev_load(net, ifr->ifr_name);
                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                        return -EPERM;

                rtnl_net_lock(net);
                ret = dev_ifsioc(net, ifr, data, cmd);
                rtnl_net_unlock(net);

                if (colon)
                        *colon = ':';
                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;
                fallthrough;
        /*
         *      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 SIOCSHWTSTAMP:
                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                        return -EPERM;
                fallthrough;
        case SIOCBONDSLAVEINFOQUERY:
        case SIOCBONDINFOQUERY:
                dev_load(net, ifr->ifr_name);

                rtnl_net_lock(net);
                ret = dev_ifsioc(net, ifr, data, cmd);
                rtnl_net_unlock(net);

                if (need_copyout)
                        *need_copyout = false;
                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 == SIOCGHWTSTAMP ||
                    (cmd >= SIOCDEVPRIVATE &&
                     cmd <= SIOCDEVPRIVATE + 15)) {
                        dev_load(net, ifr->ifr_name);

                        rtnl_net_lock(net);
                        ret = dev_ifsioc(net, ifr, data, cmd);
                        rtnl_net_unlock(net);
                        return ret;
                }
                return -ENOTTY;
        }
}