Skip to content

Commit

Permalink
macvlan: return correct error value
Browse files Browse the repository at this point in the history
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>
  • Loading branch information
Matteo Croce authored and David S. Miller committed Dec 4, 2018
1 parent fb6df5a commit 59f997b
Showing 1 changed file with 5 additions and 2 deletions.
7 changes: 5 additions & 2 deletions drivers/net/macvlan.c
Original file line number Diff line number Diff line change
Expand Up @@ -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;

Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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);
}

Expand Down

0 comments on commit 59f997b

Please sign in to comment.