vxlan: add ipv6 route short circuit support

route short circuit only has IPv4 part, this patch adds
the IPv6 part. nd_tbl will be needed.

Cc: David S. Miller <davem@davemloft.net>
Cc: David Stevens <dlstevens@us.ibm.com>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 28 insertions, 2 deletions

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index faf131e02a72..c833763fe5c4 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1200,7 +1200,6 @@ static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
 {
         struct vxlan_dev *vxlan = netdev_priv(dev);
         struct neighbour *n;
-        struct iphdr *pip;
 
         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
                 return false;
@@ -1208,6 +1207,9 @@ static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
         n = NULL;
         switch (ntohs(eth_hdr(skb)->h_proto)) {
         case ETH_P_IP:
+        {
+                struct iphdr *pip;
+
                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
                         return false;
                 pip = ip_hdr(skb);
@@ -1223,6 +1225,29 @@ static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
                 }
 
                 break;
+        }
+#if IS_ENABLED(CONFIG_IPV6)
+        case ETH_P_IPV6:
+        {
+                struct ipv6hdr *pip6;
+
+                if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+                        return false;
+                pip6 = ipv6_hdr(skb);
+                n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
+                if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
+                        union vxlan_addr ipa = {
+                                .sin6.sin6_addr = pip6->daddr,
+                                .sa.sa_family = AF_INET6,
+                        };
+
+                        vxlan_ip_miss(dev, &ipa);
+                        return false;
+                }
+
+                break;
+        }
+#endif
         default:
                 return false;
         }
@@ -1659,7 +1684,8 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
         did_rsc = false;
 
         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
-            ntohs(eth->h_proto) == ETH_P_IP) {
+            (ntohs(eth->h_proto) == ETH_P_IP ||
+             ntohs(eth->h_proto) == ETH_P_IPV6)) {
                 did_rsc = route_shortcircuit(dev, skb);
                 if (did_rsc)
                         f = vxlan_find_mac(vxlan, eth->h_dest);