netdev - [PATCH net-next 2/2] vxlan: fix getting tos value from DSCP field

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Message-Id: <20200803080217.391850-3-liuhangbin@gmail.com>
Date:   Mon,  3 Aug 2020 16:02:17 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     netdev@...r.kernel.org
Cc:     Guillaume Nault <gnault@...hat.com>,
        Petr Machata <pmachata@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        David Ahern <dsahern@...nel.org>,
        Eelco Chaudron <echaudro@...hat.com>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH net-next 2/2] vxlan: fix getting tos value from DSCP field

In commit 71130f29979c ("vxlan: fix tos value before xmit") we strict
the vxlan tos value before xmit. But as IP tos field has been obsoleted
by RFC2474, and updated by RFC3168 later. We should use new DSCP field,
or we will lost the first 3 bits value when xmit.

Fixes: 71130f29979c ("vxlan: fix tos value before xmit")
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 drivers/net/vxlan.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 77658425db8a..fe051ed0f6db 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2722,7 +2722,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 		ndst = &rt->dst;
 		skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
 
-		tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb);
+		tos = ip_tunnel_ecn_encap(RT_DSCP(tos), old_iph, skb);
 		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 		err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
 				      vni, md, flags, udp_sum);
@@ -2762,7 +2762,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 
 		skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
 
-		tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb);
+		tos = ip_tunnel_ecn_encap(RT_DSCP(tos), old_iph, skb);
 		ttl = ttl ? : ip6_dst_hoplimit(ndst);
 		skb_scrub_packet(skb, xnet);
 		err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
-- 
2.25.4