The below commit adds support for:
> ip link set dummy0 down
> ip link set dummy0 master bond0 up
but breaks the opposite:
> ip link set dummy0 up
> ip link set dummy0 master bond0 down
Let's add a workaround to have both commands working.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: a4abfa627c38 ("net: rtnetlink: Enslave device before bringing it up")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Acked-by: Phil Sutter <phil@xxxxxx>
---
net/core/rtnetlink.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index e8431c6c8490..dd79693c2d91 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2905,6 +2905,14 @@ static int do_setlink(const struct sk_buff *skb,
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
}
+ /* Backward compat: enable to set interface down before enslaving it */
+ if (!(ifm->ifi_flags & IFF_UP) && ifm->ifi_change & IFF_UP) {
+ err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
+ extack);
+ if (err < 0)
+ goto errout;
+ }
+
if (tb[IFLA_MASTER]) {
err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
if (err)
--
2.39.2
