netdev - [PATCH net-next] net/mlx5e: Allow dropping specific tunnel packets

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Message-Id: <1564648859-17369-1-git-send-email-xiangxia.m.yue@gmail.com>
Date:   Thu,  1 Aug 2019 16:40:59 +0800
From:   xiangxia.m.yue@...il.com
To:     roid@...lanox.com, saeedm@...lanox.com
Cc:     netdev@...r.kernel.org, Tonghao Zhang <xiangxia.m.yue@...il.com>
Subject: [PATCH net-next] net/mlx5e: Allow dropping specific tunnel packets

From: Tonghao Zhang <xiangxia.m.yue@...il.com>

In some case, we don't want to allow specific tunnel packets
to host that can avoid to take up high CPU (e.g network attacks).
But other tunnel packets which not matched in hardware will be
sent to host too.

    $ tc filter add dev vxlan_sys_4789 \
	    protocol ip chain 0 parent ffff: prio 1 handle 1 \
	    flower dst_ip 1.1.1.100 ip_proto tcp dst_port 80 \
	    enc_dst_ip 2.2.2.100 enc_key_id 100 enc_dst_port 4789 \
	    action tunnel_key unset pipe action drop

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index f3ed028..25d423e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2485,7 +2485,8 @@ static bool actions_match_supported(struct mlx5e_priv *priv,
 
 	if (flow_flag_test(flow, EGRESS) &&
 	    !((actions & MLX5_FLOW_CONTEXT_ACTION_DECAP) ||
-	      (actions & MLX5_FLOW_CONTEXT_ACTION_VLAN_POP)))
+	      (actions & MLX5_FLOW_CONTEXT_ACTION_VLAN_POP) ||
+	      (actions & MLX5_FLOW_CONTEXT_ACTION_DROP)))
 		return false;
 
 	if (actions & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)
-- 
1.8.3.1