Merge branch 'vxlan-fixes'

Jiri Benc says:

====================
vxlan: fix error reporting

This patchset improves checking for invalid configuration in VXLAN and
fixes problems with duplicated and inappropriate error messages.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 26 deletions

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index c0dda6fc0921..6e65832051d6 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2782,14 +2782,15 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
         struct net_device *lowerdev = NULL;
 
         if (conf->flags & VXLAN_F_GPE) {
-                if (conf->flags & ~VXLAN_F_ALLOWED_GPE)
-                        return -EINVAL;
                 /* For now, allow GPE only together with COLLECT_METADATA.
                  * This can be relaxed later; in such case, the other side
                  * of the PtP link will have to be provided.
                  */
-                if (!(conf->flags & VXLAN_F_COLLECT_METADATA))
+                if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
+                    !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
+                        pr_info("unsupported combination of extensions\n");
                         return -EINVAL;
+                }
 
                 vxlan_raw_setup(dev);
         } else {
@@ -2842,6 +2843,9 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
 
                 needed_headroom = lowerdev->hard_header_len;
+        } else if (vxlan_addr_multicast(&dst->remote_ip)) {
+                pr_info("multicast destination requires interface to be specified\n");
+                return -EINVAL;
         }
 
         if (conf->mtu) {
@@ -2874,8 +2878,10 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
-                    (vxlan->flags & VXLAN_F_RCV_FLAGS))
-                return -EEXIST;
+                    (vxlan->flags & VXLAN_F_RCV_FLAGS)) {
+                        pr_info("duplicate VNI %u\n", be32_to_cpu(conf->vni));
+                        return -EEXIST;
+                }
         }
 
         dev->ethtool_ops = &vxlan_ethtool_ops;
@@ -2909,7 +2915,6 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
                          struct nlattr *tb[], struct nlattr *data[])
 {
         struct vxlan_config conf;
-        int err;
 
         memset(&conf, 0, sizeof(conf));
 
@@ -3018,26 +3023,7 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
         if (tb[IFLA_MTU])
                 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
 
-        err = vxlan_dev_configure(src_net, dev, &conf);
-        switch (err) {
-        case -ENODEV:
-                pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
-                break;
-
-        case -EPERM:
-                pr_info("IPv6 is disabled via sysctl\n");
-                break;
-
-        case -EEXIST:
-                pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
-                break;
-
-        case -EINVAL:
-                pr_info("unsupported combination of extensions\n");
-                break;
-        }
-
-        return err;
+        return vxlan_dev_configure(src_net, dev, &conf);
 }
 
 static void vxlan_dellink(struct net_device *dev, struct list_head *head)