From: Hangbin Liu liuhangbin@gmail.com
[ Upstream commit a0dced17ad9dc08b1b25e0065b54c97a318e6e8b ]
This reverts commit 71130f29979c7c7956b040673e6b9d5643003176.
In commit 71130f29979c ("vxlan: fix tos value before xmit") we want to make sure the tos value are filtered by RT_TOS() based on RFC1349.
0 1 2 3 4 5 6 7 +-----+-----+-----+-----+-----+-----+-----+-----+ | PRECEDENCE | TOS | MBZ | +-----+-----+-----+-----+-----+-----+-----+-----+
But RFC1349 has been obsoleted by RFC2474. The new DSCP field defined like
0 1 2 3 4 5 6 7 +-----+-----+-----+-----+-----+-----+-----+-----+ | DS FIELD, DSCP | ECN FIELD | +-----+-----+-----+-----+-----+-----+-----+-----+
So with
IPTOS_TOS_MASK 0x1E RT_TOS(tos) ((tos)&IPTOS_TOS_MASK)
the first 3 bits DSCP info will get lost.
To take all the DSCP info in xmit, we should revert the patch and just push all tos bits to ip_tunnel_ecn_encap(), which will handling ECN field later.
Fixes: 71130f29979c ("vxlan: fix tos value before xmit") Signed-off-by: Hangbin Liu liuhangbin@gmail.com Acked-by: Guillaume Nault gnault@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/vxlan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2222,7 +2222,7 @@ static void vxlan_xmit_one(struct sk_buf skb_dst_update_pmtu(skb, mtu); }
- tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb); + tos = ip_tunnel_ecn_encap(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); @@ -2263,7 +2263,7 @@ static void vxlan_xmit_one(struct sk_buf skb_dst_update_pmtu(skb, mtu); }
- tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb); + tos = ip_tunnel_ecn_encap(tos, old_iph, skb); ttl = ttl ? : ip6_dst_hoplimit(ndst); skb_scrub_packet(skb, xnet); err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),