udp: prevent skbs lingering in tunnel socket queues

In case we find a socket with encapsulation enabled we should call
the encap_recv function even if just a udp header without payload is
available. The callbacks are responsible for correctly verifying and
dropping the packets.

Also, in case the header validation fails for geneve and vxlan we
shouldn't put the skb back into the socket queue, no one will pick
them up there.  Instead we can simply discard them in the respective
encap_recv functions.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 7 deletions

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index a6dc11ce497f..cadefe4fdaa2 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -335,15 +335,15 @@ static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 
         /* Need Geneve and inner Ethernet header to be present */
         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
-                goto error;
+                goto drop;
 
         /* Return packets with reserved bits set */
         geneveh = geneve_hdr(skb);
         if (unlikely(geneveh->ver != GENEVE_VER))
-                goto error;
+                goto drop;
 
         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
-                goto error;
+                goto drop;
 
         gs = rcu_dereference_sk_user_data(sk);
         if (!gs)
@@ -366,10 +366,6 @@ drop:
         /* Consume bad packet */
         kfree_skb(skb);
         return 0;
-
-error:
-        /* Let the UDP layer deal with the skb */
-        return 1;
 }
 
 static struct socket *geneve_create_sock(struct net *net, bool ipv6,