veth: delete device before creation to handle stale state

When a veth device already exists in the kernel (from a previous failed
cleanup or external creation), attempting to create it again with
NLM_F_EXCL fails with -EEXIST. This leaves the device in a broken state
where netifd marks it as present but cannot bring it up.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 2 insertions, 0 deletions

diff --git a/veth.c b/veth.c
index 46b6eff..2f03456 100644
--- a/veth.c
+++ b/veth.c
@@ -68,6 +68,8 @@ veth_set_up(struct veth *veth)
 {
 	int ret;
 
+	system_veth_del(&veth->dev);
+
 	ret = system_veth_add(&veth->dev, &veth->config);
 	if (ret < 0)
 		return ret;