linux-kernel - [PATCH AUTOSEL 4.14 12/29] net/sched: act_sample: don't push mac header on ip6gre ingress

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Message-Id: <20191001164423.16406-12-sashal@kernel.org>
Date:   Tue,  1 Oct 2019 12:44:06 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Davide Caratti <dcaratti@...hat.com>,
        Yotam Gigi <yotam.gi@...il.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 12/29] net/sched: act_sample: don't push mac header on ip6gre ingress

From: Davide Caratti <dcaratti@...hat.com>

[ Upstream commit 92974a1d006ad8b30d53047c70974c9e065eb7df ]

current 'sample' action doesn't push the mac header of ingress packets if
they are received by a layer 3 tunnel (like gre or sit); but it forgot to
check for gre over ipv6, so the following script:

 # tc q a dev $d clsact
 # tc f a dev $d ingress protocol ip flower ip_proto icmp action sample \
 > group 100 rate 1
 # psample -v -g 100

dumps everything, including outer header and mac, when $d is a gre tunnel
over ipv6. Fix this adding a missing label for ARPHRD_IP6GRE devices.

Fixes: 5c5670fae430 ("net/sched: Introduce sample tc action")
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
Reviewed-by: Yotam Gigi <yotam.gi@...il.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sched/act_sample.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c
index 489db1064d5bc..9d92eac019580 100644
--- a/net/sched/act_sample.c
+++ b/net/sched/act_sample.c
@@ -132,6 +132,7 @@ static bool tcf_sample_dev_ok_push(struct net_device *dev)
 	case ARPHRD_TUNNEL6:
 	case ARPHRD_SIT:
 	case ARPHRD_IPGRE:
+	case ARPHRD_IP6GRE:
 	case ARPHRD_VOID:
 	case ARPHRD_NONE:
 		return false;
-- 
2.20.1