linux-kernel - [PATCH 1/7 net-next] vxlan: don't collect metadata if remote checksum is wrong

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Message-Id: <20200827064856.5580-1-fabf@skynet.be>
Date:   Thu, 27 Aug 2020 08:48:56 +0200
From:   Fabian Frederick <fabf@...net.be>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Fabian Frederick <fabf@...net.be>
Subject: [PATCH 1/7 net-next] vxlan: don't collect metadata if remote checksum is wrong

call vxlan_remcsum() before md filling in vxlan_rcv()

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 drivers/net/vxlan.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index b9fefe27e3e89..47c762f7f5b11 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1875,6 +1875,10 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
 				   !net_eq(vxlan->net, dev_net(vxlan->dev))))
 		goto drop;
 
+	if (vs->flags & VXLAN_F_REMCSUM_RX)
+		if (!vxlan_remcsum(&unparsed, skb, vs->flags))
+			goto drop;
+
 	if (vxlan_collect_metadata(vs)) {
 		struct metadata_dst *tun_dst;
 
@@ -1891,9 +1895,6 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
 		memset(md, 0, sizeof(*md));
 	}
 
-	if (vs->flags & VXLAN_F_REMCSUM_RX)
-		if (!vxlan_remcsum(&unparsed, skb, vs->flags))
-			goto drop;
 	if (vs->flags & VXLAN_F_GBP)
 		vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
 	/* Note that GBP and GPE can never be active together. This is
-- 
2.27.0