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| author | Michael S. Tsirkin <mst@redhat.com> | 2013-08-01 13:43:19 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-08-01 16:32:05 -0700 |
| commit | 266e83474c98e9f18d31f4837cfe05819a660d32 (patch) | |
| tree | ee1ee950654dcb6eab2f2d3f78f03db4a29e3ae1 | |
| parent | c756891a4e1c08c43780e17aca1d2b849ef31d1a (diff) | |
| download | linux-266e83474c98e9f18d31f4837cfe05819a660d32.tar.gz linux-266e83474c98e9f18d31f4837cfe05819a660d32.tar.bz2 linux-266e83474c98e9f18d31f4837cfe05819a660d32.zip | |
macvlan: better mode validation
macvlan passthrough mode is special: it's not possible to switch to or
from it through a netlink command.
But if you try, the command will succeed, which is
confusing.
Validate input and return error to user.
Cc: Sridhar Samudrala <sri@us.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/macvlan.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 18373b6ae37d..13937f9c04ad 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -863,6 +863,18 @@ static int macvlan_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { struct macvlan_dev *vlan = netdev_priv(dev); + enum macvlan_mode mode; + bool set_mode = false; + + /* Validate mode, but don't set yet: setting flags may fail. */ + if (data && data[IFLA_MACVLAN_MODE]) { + set_mode = true; + mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); + /* Passthrough mode can't be set or cleared dynamically */ + if ((mode == MACVLAN_MODE_PASSTHRU) != + (vlan->mode == MACVLAN_MODE_PASSTHRU)) + return -EINVAL; + } if (data && data[IFLA_MACVLAN_FLAGS]) { __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); @@ -879,8 +891,8 @@ static int macvlan_changelink(struct net_device *dev, } vlan->flags = flags; } - if (data && data[IFLA_MACVLAN_MODE]) - vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); + if (set_mode) + vlan->mode = mode; return 0; } |