This is a note to let you know that I've just added the patch titled
Revert "vxlan: fix tos value before xmit"
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-vxlan-fix-tos-value-before-xmit.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon 10 Aug 2020 03:30:25 PM CEST
From: Hangbin Liu <liuhangbin@xxxxxxxxx>
Date: Wed, 5 Aug 2020 10:41:31 +0800
Subject: Revert "vxlan: fix tos value before xmit"
From: Hangbin Liu <liuhangbin@xxxxxxxxx>
[ 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@xxxxxxxxx>
Acked-by: Guillaume Nault <gnault@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/vxlan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2070,7 +2070,7 @@ static void vxlan_xmit_one(struct sk_buf
return;
}
- 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_xmit_skb(rt, sk, skb, fl4.saddr,
dst->sin.sin_addr.s_addr, tos, ttl, df,
Patches currently in stable-queue which might be from liuhangbin@xxxxxxxxx are
queue-4.4/revert-vxlan-fix-tos-value-before-xmit.patch
