4.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
[ Upstream commit e5aed006be918af163eb397e45aa5ea6cefd5e01 ]
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@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/geneve.c | 10 +++-------
drivers/net/vxlan.c | 4 ++--
net/ipv4/udp.c | 2 +-
net/ipv6/udp.c | 2 +-
4 files changed, 7 insertions(+), 11 deletions(-)
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -336,15 +336,15 @@ static int geneve_udp_encap_recv(struct
/* 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)
@@ -367,10 +367,6 @@ 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,
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1262,7 +1262,7 @@ static int vxlan_rcv(struct sock *sk, st
/* Need Vxlan and inner Ethernet header to be present */
if (!pskb_may_pull(skb, VXLAN_HLEN))
- return 1;
+ goto drop;
unparsed = *vxlan_hdr(skb);
/* VNI flag always required to be set */
@@ -1271,7 +1271,7 @@ static int vxlan_rcv(struct sock *sk, st
ntohl(vxlan_hdr(skb)->vx_flags),
ntohl(vxlan_hdr(skb)->vx_vni));
/* Return non vxlan pkt */
- return 1;
+ goto drop;
}
unparsed.vx_flags &= ~VXLAN_HF_VNI;
unparsed.vx_vni &= ~VXLAN_VNI_MASK;
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1616,7 +1616,7 @@ int udp_queue_rcv_skb(struct sock *sk, s
/* if we're overly short, let UDP handle it */
encap_rcv = ACCESS_ONCE(up->encap_rcv);
- if (skb->len > sizeof(struct udphdr) && encap_rcv) {
+ if (encap_rcv) {
int ret;
/* Verify checksum before giving to encap */
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -653,7 +653,7 @@ int udpv6_queue_rcv_skb(struct sock *sk,
/* if we're overly short, let UDP handle it */
encap_rcv = ACCESS_ONCE(up->encap_rcv);
- if (skb->len > sizeof(struct udphdr) && encap_rcv) {
+ if (encap_rcv) {
int ret;
/* Verify checksum before giving to encap */
--
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