[PATCH net-next 1/3] vxlan: don't allow link-local IPv6 local/remote addresses without interface

[Matthias Schiffer]

Signed-off-by: Matthias Schiffer <mschif...@universe-factory.net>
---
 drivers/net/vxlan.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index e375560cc74e..cc0ace73d02e 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2922,6 +2922,18 @@ static int vxlan_dev_configure(struct net *src_net, 
struct net_device *dev,
                pr_info("multicast destination requires interface to be 
specified\n");
                return -EINVAL;
        }
+#if IS_ENABLED(CONFIG_IPV6)
+       else if (!conf->remote_ifindex &&
+                ((conf->saddr.sa.sa_family == AF_INET6 &&
+                 (ipv6_addr_type(&conf->saddr.sin6.sin6_addr) &
+                  IPV6_ADDR_LINKLOCAL)) ||
+                 (dst->remote_ip.sa.sa_family == AF_INET6 &&
+                  (ipv6_addr_type(&dst->remote_ip.sin6.sin6_addr) &
+                   IPV6_ADDR_LINKLOCAL)))) {
+               pr_info("link-local local/remote addresses require interface to 
be specified\n");
+               return -EINVAL;
+       }
+#endif
 
        if (conf->mtu) {
                int max_mtu = ETH_MAX_MTU;
-- 
2.12.0