vxlan: fix wrong usage of VXLAN_VID_MASK

commit dfd8645ea1bd9127 wrongly assumes that VXLAN_VDI_MASK includes
eight lower order reserved bits of VNI field that are using for remote
checksum offload.

Right now, when VNI number greater then 0xffff, vxlan_udp_encap_recv()
will always return with 'bad_flag' error, reducing the usable vni range
from 0..16777215 to 0..65535. Also, it doesn't really check whether RCO
bits processed or not.

Fix it by adding new VNI mask which has all 32 bits of VNI field:
24 bits for id and 8 bits for other usage.

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 1e0a775ea882995d88127e4d3c2a8f3f0afb8d60..f8528a4cf54f2b0bc78b78bd705a82577530bdeb 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1218,7 +1218,7 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
                        goto drop;
 
                flags &= ~VXLAN_HF_RCO;
-               vni &= VXLAN_VID_MASK;
+               vni &= VXLAN_VNI_MASK;
        }
 
        /* For backwards compatibility, only allow reserved fields to be
@@ -1239,7 +1239,7 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
                flags &= ~VXLAN_GBP_USED_BITS;
        }
 
-       if (flags || (vni & ~VXLAN_VID_MASK)) {
+       if (flags || vni & ~VXLAN_VNI_MASK) {
                /* If there are any unprocessed flags remaining treat
                 * this as a malformed packet. This behavior diverges from
                 * VXLAN RFC (RFC7348) which stipulates that bits in reserved

diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index eabd3a038674dd00f69263b47828134dd3a24bf1..c73e7abbbaa50e917e65a1117e881bd78665b12a 100644 (file)
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -91,6 +91,7 @@ struct vxlanhdr {
 
 #define VXLAN_N_VID     (1u << 24)
 #define VXLAN_VID_MASK  (VXLAN_N_VID - 1)
+#define VXLAN_VNI_MASK  (VXLAN_VID_MASK << 8)
 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
 
 struct vxlan_metadata {