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bridge: use ndo_siocdevprivate

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The bridge driver has an old set of ioctls using the SIOCDEVPRIVATE
namespace that have never worked in compat mode and are explicitly
forbidden already.

Move them over to ndo_siocdevprivate and fix compat mode for these,
because we can.

Cc: Roopa Prabhu <roopa@nvidia.com>
Cc: Nikolay Aleksandrov <nikolay@nvidia.com>
Cc: bridge@lists.linux-foundation.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2021-07-27 15:44:51 +02:00 committed by David S. Miller
parent 3f3fa53407
commit 561d835281
3 changed files with 28 additions and 12 deletions
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1
net/bridge/br_device.c
View file

@ -455,6 +455,7 @@ static const struct net_device_ops br_netdev_ops = {
.ndo_change_rx_flags = br_dev_change_rx_flags,
.ndo_change_mtu = br_change_mtu,
.ndo_do_ioctl = br_dev_ioctl,
.ndo_siocdevprivate = br_dev_siocdevprivate,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_netpoll_setup = br_netpoll_setup,
.ndo_netpoll_cleanup = br_netpoll_cleanup,

37
net/bridge/br_ioctl.c
View file

@ -106,15 +106,32 @@ static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
* This interface is deprecated because it was too difficult
* to do the translation for 32/64bit ioctl compatibility.
*/
static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user *data, int cmd)
{
struct net_bridge *br = netdev_priv(dev);
struct net_bridge_port *p = NULL;
unsigned long args[4];
void __user *argp;
int ret = -EOPNOTSUPP;
if (copy_from_user(args, rq->ifr_data, sizeof(args)))
return -EFAULT;
if (in_compat_syscall()) {
unsigned int cargs[4];
if (copy_from_user(cargs, data, sizeof(cargs)))
return -EFAULT;
args[0] = cargs[0];
args[1] = cargs[1];
args[2] = cargs[2];
args[3] = cargs[3];
argp = compat_ptr(args[1]);
} else {
if (copy_from_user(args, data, sizeof(args)))
return -EFAULT;
argp = (void __user *)args[1];
}
switch (args[0]) {
case BRCTL_ADD_IF:
@ -171,7 +188,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
return -ENOMEM;
get_port_ifindices(br, indices, num);
if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
if (copy_to_user(argp, indices, num * sizeof(int)))
num = -EFAULT;
kfree(indices);
return num;
@ -232,7 +249,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
rcu_read_unlock();
if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
if (copy_to_user(argp, &p, sizeof(p)))
return -EFAULT;
return 0;
@ -282,8 +299,7 @@ static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
}
case BRCTL_GET_FDB_ENTRIES:
return get_fdb_entries(br, (void __user *)args[1],
args[2], args[3]);
return get_fdb_entries(br, argp, args[2], args[3]);
}
if (!ret) {
@ -320,7 +336,7 @@ static int old_deviceless(struct net *net, void __user *uarg)
args[2] = get_bridge_ifindices(net, indices, args[2]);
ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
ret = copy_to_user(uarg, indices, args[2]*sizeof(int))
? -EFAULT : args[2];
kfree(indices);
@ -335,7 +351,7 @@ static int old_deviceless(struct net *net, void __user *uarg)
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
if (copy_from_user(buf, uarg, IFNAMSIZ))
return -EFAULT;
buf[IFNAMSIZ-1] = 0;
@ -383,9 +399,6 @@ int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
struct net_bridge *br = netdev_priv(dev);
switch (cmd) {
case SIOCDEVPRIVATE:
return old_dev_ioctl(dev, rq, cmd);
case SIOCBRADDIF:
case SIOCBRDELIF:
return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);

2
net/bridge/br_private.h
View file

@ -852,6 +852,8 @@ br_port_get_check_rtnl(const struct net_device *dev)
/* br_ioctl.c */
int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq,
void __user *data, int cmd);
int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
void __user *arg);