netdev - [PATCH net] net/sched: act_sample: don't push mac header on ip6gre ingress

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Message-Id: <c359067b4a84342ff24c6a3d089171de68489fcd.1568709449.git.dcaratti@redhat.com>
Date:   Tue, 17 Sep 2019 11:30:55 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     Jiri Pirko <jiri@...nulli.us>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Yotam Gigi <yotamg@...lanox.com>
Subject: [PATCH net] net/sched: act_sample: don't push mac header on ip6gre ingress

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>
---
 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 10229124a992..86344fd2ff1f 100644
--- a/net/sched/act_sample.c
+++ b/net/sched/act_sample.c
@@ -146,6 +146,7 @@ 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;
-- 
2.21.0