[PATCH net] vxlan: interpret IP headers for ECN correctly

[PATCH net] vxlan: interpret IP headers for ECN correctly

[Jiri Benc]

When looking for outer IP header, use the actual socket address family, not
the address family of the default destination which is not set for metadata
based interfaces (and doesn't have to match the address family of the
received packet even if it was set).

Fix also the misleading comment.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
---
 drivers/net/vxlan.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 6369a5734d4c..2718b836c1e7 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1158,7 +1158,6 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
 	struct pcpu_sw_netstats *stats;
 	union vxlan_addr saddr;
 	int err = 0;
-	union vxlan_addr *remote_ip;
 
 	/* For flow based devices, map all packets to VNI 0 */
 	if (vs->flags & VXLAN_F_COLLECT_METADATA)
@@ -1169,7 +1168,6 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
 	if (!vxlan)
 		goto drop;
 
-	remote_ip = &vxlan->default_dst.remote_ip;
 	skb_reset_mac_header(skb);
 	skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
 	skb->protocol = eth_type_trans(skb, vxlan->dev);
@@ -1179,8 +1177,8 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
 	if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
 		goto drop;
 
-	/* Re-examine inner Ethernet packet */
-	if (remote_ip->sa.sa_family == AF_INET) {
+	/* Get data from the outer IP header */
+	if (vxlan_get_sk_family(vs) == AF_INET) {
 		oip = ip_hdr(skb);
 		saddr.sin.sin_addr.s_addr = oip->saddr;
 		saddr.sa.sa_family = AF_INET;
-- 
1.8.3.1

Re: [PATCH net] vxlan: interpret IP headers for ECN correctly

[David Miller]

From: Jiri Benc <jbenc@redhat.com>
Date: Mon,  7 Dec 2015 16:29:08 +0100

> When looking for outer IP header, use the actual socket address family, not
> the address family of the default destination which is not set for metadata
> based interfaces (and doesn't have to match the address family of the
> received packet even if it was set).
> 
> Fix also the misleading comment.
> 
> Signed-off-by: Jiri Benc <jbenc@redhat.com>

Applied, thanks.