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

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Date:   Fri, 10 Mar 2017 23:39:42 +0100
From:   Matthias Schiffer <mschiffer@...verse-factory.net>
To:     davem@...emloft.net, jbenc@...hat.com, hannes@...essinduktion.org,
        pshelar@....org, aduyck@...antis.com, roopa@...ulusnetworks.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/3] vxlan: don't allow link-local IPv6 local/remote addresses without interface

Signed-off-by: Matthias Schiffer <mschiffer@...verse-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