Set the perm_addr of vlan devices to that of their parent device.
Otherwise, it remains all zero, with the consequence that
ipv6_generate_stable_address() (which is used if the sysctl
net.ipv6.conf.DEV.addr_gen_mode is set to 2 or 3) assigns every vlan
interface on a host the same link-local address.
This has the added benefit of giving vlan devices the same link-local
address as their parent device, which is common practice, and indeed
precisely what happens automatically if the default eui64-based address
generation is used.
Signed-off-by: Mira Ressel <ara...@aixah.de>
---
net/8021q/vlan_netlink.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
index 0db85aeb119b..8c60d92b7717 100644
--- a/net/8021q/vlan_netlink.c
+++ b/net/8021q/vlan_netlink.c
@@ -182,6 +182,8 @@ static int vlan_newlink(struct net *src_net, struct
net_device *dev,
else if (dev->mtu > max_mtu)
return -EINVAL;
+ memcpy(dev->perm_addr, real_dev->perm_addr, real_dev->addr_len);
+
err = vlan_changelink(dev, tb, data, extack);
if (!err)
err = register_vlan_dev(dev, extack);
--
2.25.4
