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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>
This commit is contained in:
Hannes Frederic Sowa 2016-05-19 15:58:33 +02:00 committed by David S. Miller
parent cb543e80f4
commit e5aed006be
4 changed files with 7 additions and 11 deletions
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10
drivers/net/geneve.c
View File

@ -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,

4
drivers/net/vxlan.c
View File

@ -1304,7 +1304,7 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
/* Need UDP and VXLAN 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 */
@ -1313,7 +1313,7 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
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;

2
net/ipv4/udp.c
View File

@ -1565,7 +1565,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
/* 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 */

2
net/ipv6/udp.c
View File

@ -617,7 +617,7 @@ int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
/* 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 */