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net: hold netdev instance lock during ioctl operations

Browse source 
Convert all ndo_eth_ioctl invocations to dev_eth_ioctl which does the
locking. Reflow some of the dev_siocxxx to drop else clause.

Cc: Saeed Mahameed <saeed@kernel.org>
Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250305163732.2766420-8-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stanislav Fomichev 2025-03-05 08:37:25 -08:00 • committed by Jakub Kicinski
parent 7e4d784f58
commit ffb7ed19ac
6 changed files with 80 additions and 37 deletions
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9
drivers/net/bonding/bond_main.c
View file

@ -855,7 +855,6 @@ static int bond_check_dev_link(struct bonding *bond,
struct net_device *slave_dev, int reporting)
{
const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
int (*ioctl)(struct net_device *, struct ifreq *, int);
struct ifreq ifr;
struct mii_ioctl_data *mii;
@ -871,8 +870,7 @@ static int bond_check_dev_link(struct bonding *bond,
BMSR_LSTATUS : 0;
/* Ethtool can't be used, fallback to MII ioctls. */
ioctl = slave_ops->ndo_eth_ioctl;
if (ioctl) {
if (slave_ops->ndo_eth_ioctl) {
/* TODO: set pointer to correct ioctl on a per team member
* bases to make this more efficient. that is, once
* we determine the correct ioctl, we will always
@ -888,9 +886,10 @@ static int bond_check_dev_link(struct bonding *bond,
/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
mii = if_mii(&ifr);
if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
if (dev_eth_ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
mii->reg_num = MII_BMSR;
if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
if (dev_eth_ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
return mii->val_out & BMSR_LSTATUS;
}
}

3
include/linux/netdevice.h
View file

@ -4229,6 +4229,8 @@ int put_user_ifreq(struct ifreq *ifr, void __user *arg);
int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
void __user *data, bool *need_copyout);
int dev_ifconf(struct net *net, struct ifconf __user *ifc);
int dev_eth_ioctl(struct net_device *dev,
struct ifreq *ifr, unsigned int cmd);
int generic_hwtstamp_get_lower(struct net_device *dev,
struct kernel_hwtstamp_config *kernel_cfg);
int generic_hwtstamp_set_lower(struct net_device *dev,
@ -4251,6 +4253,7 @@ int netif_change_net_namespace(struct net_device *dev, struct net *net,
int dev_change_net_namespace(struct net_device *dev, struct net *net,
const char *pat);
int __dev_set_mtu(struct net_device *, int);
int netif_set_mtu(struct net_device *dev, int new_mtu);
int dev_set_mtu(struct net_device *, int);
int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr,
struct netlink_ext_ack *extack);

4
net/8021q/vlan_dev.c
View file

@ -377,7 +377,6 @@ static int vlan_hwtstamp_set(struct net_device *dev,
static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
const struct net_device_ops *ops = real_dev->netdev_ops;
struct ifreq ifrr;
int err = -EOPNOTSUPP;
@ -388,8 +387,7 @@ static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
case SIOCGMIIPHY:
case SIOCGMIIREG:
case SIOCSMIIREG:
if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
err = dev_eth_ioctl(real_dev, &ifrr, cmd);
break;
}

4
net/core/dev.c
View file

@ -9522,7 +9522,7 @@ int netif_set_mtu_ext(struct net_device *dev, int new_mtu,
return err;
}
int dev_set_mtu(struct net_device *dev, int new_mtu)
int netif_set_mtu(struct net_device *dev, int new_mtu)
{
struct netlink_ext_ack extack;
int err;
@ -9533,7 +9533,7 @@ int dev_set_mtu(struct net_device *dev, int new_mtu)
net_err_ratelimited("%s: %s\n", dev->name, extack._msg);
return err;
}
EXPORT_SYMBOL(dev_set_mtu);
EXPORT_SYMBOL(netif_set_mtu);
int netif_change_tx_queue_len(struct net_device *dev, unsigned long new_len)
{

30
net/core/dev_api.c
View file

@ -222,3 +222,33 @@ void dev_close(struct net_device *dev)
netdev_unlock_ops(dev);
}
EXPORT_SYMBOL(dev_close);
int dev_eth_ioctl(struct net_device *dev,
struct ifreq *ifr, unsigned int cmd)
{
const struct net_device_ops *ops = dev->netdev_ops;
int ret = -ENODEV;
if (!ops->ndo_eth_ioctl)
return -EOPNOTSUPP;
netdev_lock_ops(dev);
if (netif_device_present(dev))
ret = ops->ndo_eth_ioctl(dev, ifr, cmd);
netdev_unlock_ops(dev);
return ret;
}
EXPORT_SYMBOL(dev_eth_ioctl);
int dev_set_mtu(struct net_device *dev, int new_mtu)
{
int ret;
netdev_lock_ops(dev);
ret = netif_set_mtu(dev, new_mtu);
netdev_unlock_ops(dev);
return ret;
}
EXPORT_SYMBOL(dev_set_mtu);

67
net/core/dev_ioctl.c
View file

@ -110,7 +110,7 @@ static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
return 0;
}
static int dev_setifmap(struct net_device *dev, struct ifreq *ifr)
static int netif_setifmap(struct net_device *dev, struct ifreq *ifr)
{
struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
@ -240,20 +240,6 @@ int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg)
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
@ -305,7 +291,9 @@ static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
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;
@ -429,7 +417,9 @@ static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
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;
@ -504,10 +494,14 @@ static int dev_siocbond(struct net_device *dev,
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))
return ops->ndo_siocbond(dev, ifr, cmd);
else
return -ENODEV;
ret = ops->ndo_siocbond(dev, ifr, cmd);
netdev_unlock_ops(dev);
return ret;
}
return -EOPNOTSUPP;
@ -519,10 +513,14 @@ static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
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))
return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
else
return -ENODEV;
ret = ops->ndo_siocdevprivate(dev, ifr, data, cmd);
netdev_unlock_ops(dev);
return ret;
}
return -EOPNOTSUPP;
@ -533,10 +531,14 @@ 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))
return ops->ndo_siocwandev(dev, ifs);
else
return -ENODEV;
ret = ops->ndo_siocwandev(dev, ifs);
netdev_unlock_ops(dev);
return ret;
}
return -EOPNOTSUPP;
@ -580,11 +582,16 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
min(sizeof(ifr->ifr_hwaddr.sa_data_min),
(size_t)dev->addr_len));
netdev_lock_ops(dev);
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
netdev_unlock_ops(dev);
return 0;
case SIOCSIFMAP:
return dev_setifmap(dev, ifr);
netdev_lock_ops(dev);
err = netif_setifmap(dev, ifr);
netdev_unlock_ops(dev);
return err;
case SIOCADDMULTI:
if (!ops->ndo_set_rx_mode ||
@ -592,7 +599,10 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
return -EINVAL;
if (!netif_device_present(dev))
return -ENODEV;
return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
netdev_lock_ops(dev);
err = dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
netdev_unlock_ops(dev);
return err;
case SIOCDELMULTI:
if (!ops->ndo_set_rx_mode ||
@ -600,7 +610,10 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
return -EINVAL;
if (!netif_device_present(dev))
return -ENODEV;
return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
netdev_lock_ops(dev);
err = dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
netdev_unlock_ops(dev);
return err;
case SIOCSIFTXQLEN:
if (ifr->ifr_qlen < 0)