netdev - [PATCH net-next 01/10] vxlan: only migrate dynamic FDB entries

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Message-Id: <1370406254-6341-1-git-send-email-stephen@networkplumber.org>
Date:	Tue,  4 Jun 2013 21:24:05 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: [PATCH net-next 01/10] vxlan: only migrate dynamic FDB entries

Only migrate dynamic forwarding table entries, don't modify
static entries. If packet received from incorrect source IP address
assume it is an imposter and drop it.

Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>

---
Should go to -stable as well.
---
 drivers/net/vxlan.c |   17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 8111565..536082a 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -604,8 +604,8 @@ skip:
 /* Watch incoming packets to learn mapping between Ethernet address
  * and Tunnel endpoint.
  */
-static void vxlan_snoop(struct net_device *dev,
-			__be32 src_ip, const u8 *src_mac)
+static int vxlan_snoop(struct net_device *dev,
+		       __be32 src_ip, const u8 *src_mac)
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct vxlan_fdb *f;
@@ -614,7 +614,11 @@ static void vxlan_snoop(struct net_device *dev,
 	f = vxlan_find_mac(vxlan, src_mac);
 	if (likely(f)) {
 		if (likely(f->remote.remote_ip == src_ip))
-			return;
+			return 0;
+
+		/* Don't migrate static entries, drop packets */
+		if (!(f->flags & NTF_SELF))
+			return 1;
 
 		if (net_ratelimit())
 			netdev_info(dev,
@@ -634,6 +638,8 @@ static void vxlan_snoop(struct net_device *dev,
 				       0, NTF_SELF);
 		spin_unlock(&vxlan->hash_lock);
 	}
+
+	return 0;
 }
 
 
@@ -766,8 +772,9 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 			       vxlan->dev->dev_addr) == 0)
 		goto drop;
 
-	if (vxlan->flags & VXLAN_F_LEARN)
-		vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source);
+	if ((vxlan->flags & VXLAN_F_LEARN) &&
+	    vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source))
+		goto drop;
 
 	__skb_tunnel_rx(skb, vxlan->dev);
 	skb_reset_network_header(skb);
-- 
1.7.10.4

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