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authorMatteo Croce <mcroce@redhat.com>2018-12-01 00:26:27 +0100
committerDavid S. Miller <davem@davemloft.net>2018-12-03 16:02:43 -0800
commit59f997b088d26a774958cb7b17b0763cd82de7ec (patch)
tree69b496f969579416c1358e43b8abdce94f7af5ec /drivers/net/macvlan.c
parentfb6df5a6234c38a9c551559506a49a677ac6f07a (diff)
downloadlinux-59f997b088d26a774958cb7b17b0763cd82de7ec.tar.bz2
macvlan: return correct error value
A MAC address must be unique among all the macvlan devices with the same lower device. The only exception is the passthru [sic] mode, which shares the lower device address. When duplicate addresses are detected, EBUSY is returned when bringing the interface up: # ip link add macvlan0 link eth0 type macvlan # read addr </sys/class/net/eth0/address # ip link set macvlan0 address $addr # ip link set macvlan0 up RTNETLINK answers: Device or resource busy Use correct error code which is EADDRINUSE, and do the check also earlier, on address change: # ip link set macvlan0 address $addr RTNETLINK answers: Address already in use Signed-off-by: Matteo Croce <mcroce@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macvlan.c')
-rw-r--r--drivers/net/macvlan.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index fc8d5f1ee1ad..0da3d36b283b 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -608,7 +608,7 @@ static int macvlan_open(struct net_device *dev)
goto hash_add;
}
- err = -EBUSY;
+ err = -EADDRINUSE;
if (macvlan_addr_busy(vlan->port, dev->dev_addr))
goto out;
@@ -706,7 +706,7 @@ static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
} else {
/* Rehash and update the device filters */
if (macvlan_addr_busy(vlan->port, addr))
- return -EBUSY;
+ return -EADDRINUSE;
if (!macvlan_passthru(port)) {
err = dev_uc_add(lowerdev, addr);
@@ -747,6 +747,9 @@ static int macvlan_set_mac_address(struct net_device *dev, void *p)
return dev_set_mac_address(vlan->lowerdev, addr);
}
+ if (macvlan_addr_busy(vlan->port, addr->sa_data))
+ return -EADDRINUSE;
+
return macvlan_sync_address(dev, addr->sa_data);
}