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linux/net/core/dev_ioctl.c
Vladimir Oltean c35e927cbe net: omit ndo_hwtstamp_get() call when possible in dev_set_hwtstamp_phylib() 
Setting dev->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS is only legal
for drivers which were converted to ndo_hwtstamp_get() and
ndo_hwtstamp_set(), and it is only there that we call ndo_hwtstamp_set()
for a request that otherwise goes to phylib (for stuff like packet traps,
which need to be undone if phylib failed, hence the old_cfg logic).

The problem is that we end up calling ndo_hwtstamp_get() when we don't
need to (even if the SIOCSHWTSTAMP wasn't intended for phylib, or if it
was, but the driver didn't set IFF_SEE_ALL_HWTSTAMP_REQUESTS). For those
unnecessary conditions, we share a code path with virtual drivers (vlan,
macvlan, bonding) where ndo_hwtstamp_get() is implemented as
generic_hwtstamp_get_lower(), and may be resolved through
generic_hwtstamp_ioctl_lower() if the lower device is unconverted.

I.e. this situation:

$ ip link add link eno0 name eno0.100 type vlan id 100
$ hwstamp_ctl -i eno0.100 -t 1

We are unprepared to deal with this, because if ndo_hwtstamp_get() is
resolved through a legacy ndo_eth_ioctl(SIOCGHWTSTAMP) lower_dev
implementation, that needs a non-NULL old_cfg.ifr pointer, and we don't
have it.

But we don't even need to deal with it either. In the general case,
drivers may not even implement SIOCGHWTSTAMP handling, only SIOCSHWTSTAMP,
so it makes sense to completely avoid a SIOCGHWTSTAMP call if we can.

The solution is to split the single "if" condition into 3 smaller ones,
thus separating the decision to call ndo_hwtstamp_get() from the
decision to call ndo_hwtstamp_set(). The third "if" condition is
identical to the first one, and both are subsets of the second one.
Thus, the "cfg" argument of kernel_hwtstamp_config_changed() is always
valid.

Reported-by: Eric Dumazet <edumazet@google.com>
Closes: https://lore.kernel.org/netdev/CANn89iLOspJsvjPj+y8jikg7erXDomWe8sqHMdfL_2LQSFrPAg@mail.gmail.com/
Fixes: fd770e856e ("net: remove phy_has_hwtstamp() -> phy_mii_ioctl() decision from converted drivers")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2023-08-06 13:25:10 +01:00

818 lines
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// 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/wireless.h>
#include <linux/if_bridge.h>
#include <net/dsa_stubs.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_lock();
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_unlock();
return -EFAULT;
}
total += done;
}
rtnl_unlock();
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 dev_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) 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 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;
}
static 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;
}
static int dev_eth_ioctl(struct net_device *dev,
struct ifreq *ifr, unsigned int cmd)
{
const struct net_device_ops *ops = dev->netdev_ops;
if (!ops->ndo_eth_ioctl)
return -EOPNOTSUPP;
if (!netif_device_present(dev))
return -ENODEV;
return ops->ndo_eth_ioctl(dev, ifr, cmd);
}
/**
* dev_get_hwtstamp_phylib() - Get hardware timestamping settings of NIC
* or of attached phylib PHY
* @dev: Network device
* @cfg: Timestamping configuration structure
*
* Helper for enforcing a common policy that phylib timestamping, if available,
* should take precedence in front of hardware timestamping provided by the
* netdev.
*
* Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), and
* there only exists a phydev->mii_ts->hwtstamp() method. So this will return
* -EOPNOTSUPP for phylib for now, which is still more accurate than letting
* the netdev handle the GET request.
*/
static int dev_get_hwtstamp_phylib(struct net_device *dev,
struct kernel_hwtstamp_config *cfg)
{
if (phy_has_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 dev_eth_ioctl(dev, ifr, SIOCGHWTSTAMP); /* legacy */
if (!netif_device_present(dev))
return -ENODEV;
kernel_cfg.ifr = ifr;
err = dev_get_hwtstamp_phylib(dev, &kernel_cfg);
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 IFF_SEE_ALL_HWTSTAMP_REQUESTS in
* dev->priv_flags.
*/
static 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;
bool phy_ts = phy_has_hwtstamp(dev->phydev);
struct kernel_hwtstamp_config old_cfg = {};
bool changed = false;
int err;
cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV;
if (phy_ts && (dev->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS)) {
err = ops->ndo_hwtstamp_get(dev, &old_cfg);
if (err)
return err;
}
if (!phy_ts || (dev->priv_flags & IFF_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->priv_flags & IFF_SEE_ALL_HWTSTAMP_REQUESTS))
changed = kernel_hwtstamp_config_changed(&old_cfg, cfg);
if (phy_ts) {
err = phy_hwtstamp_set(dev->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_master_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 dev_eth_ioctl(dev, ifr, SIOCSHWTSTAMP); /* legacy */
if (!netif_device_present(dev))
return -ENODEV;
err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack);
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;
}
static int generic_hwtstamp_ioctl_lower(struct net_device *dev, int cmd,
struct kernel_hwtstamp_config *kernel_cfg)
{
struct ifreq ifrr;
int err;
strscpy_pad(ifrr.ifr_name, dev->name, IFNAMSIZ);
ifrr.ifr_ifru = kernel_cfg->ifr->ifr_ifru;
err = dev_eth_ioctl(dev, &ifrr, cmd);
if (err)
return err;
kernel_cfg->ifr->ifr_ifru = ifrr.ifr_ifru;
kernel_cfg->copied_to_user = true;
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;
if (!netif_device_present(dev))
return -ENODEV;
if (ops->ndo_hwtstamp_get)
return dev_get_hwtstamp_phylib(dev, kernel_cfg);
/* Legacy path: unconverted lower driver */
return generic_hwtstamp_ioctl_lower(dev, SIOCGHWTSTAMP, kernel_cfg);
}
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;
if (!netif_device_present(dev))
return -ENODEV;
if (ops->ndo_hwtstamp_set)
return dev_set_hwtstamp_phylib(dev, kernel_cfg, extack);
/* Legacy path: unconverted lower driver */
return generic_hwtstamp_ioctl_lower(dev, SIOCSHWTSTAMP, kernel_cfg);
}
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) {
if (netif_device_present(dev))
return ops->ndo_siocbond(dev, ifr, cmd);
else
return -ENODEV;
}
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) {
if (netif_device_present(dev))
return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
else
return -ENODEV;
}
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) {
if (netif_device_present(dev))
return ops->ndo_siocwandev(dev, ifs);
else
return -ENODEV;
}
return -EOPNOTSUPP;
}
/*
* Perform the SIOCxIFxxx calls, inside rtnl_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;
netdevice_tracker dev_tracker;
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(struct sockaddr))
return -EINVAL;
return dev_set_mac_address_user(dev, &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_min),
(size_t)dev->addr_len));
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
return 0;
case SIOCSIFMAP:
return dev_setifmap(dev, ifr);
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;
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 SIOCBRADDIF:
case SIOCBRDELIF:
if (!netif_device_present(dev))
return -ENODEV;
if (!netif_is_bridge_master(dev))
return -EOPNOTSUPP;
netdev_hold(dev, &dev_tracker, GFP_KERNEL);
rtnl_unlock();
err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
netdev_put(dev, &dev_tracker);
rtnl_lock();
return err;
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 = dev_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_lock();
ret = dev_ifsioc(net, ifr, data, cmd);
rtnl_unlock();
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 SIOCBRADDIF:
case SIOCBRDELIF:
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_lock();
ret = dev_ifsioc(net, ifr, data, cmd);
rtnl_unlock();
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_lock();
ret = dev_ifsioc(net, ifr, data, cmd);
rtnl_unlock();
return ret;
}
return -ENOTTY;
}
}
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