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

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Date:   Thu, 1 Aug 2019 11:40:27 +0000
From:   Roi Dayan <roid@...lanox.com>
To:     "xiangxia.m.yue@...il.com" <xiangxia.m.yue@...il.com>,
        Saeed Mahameed <saeedm@...lanox.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net/mlx5e: Allow dropping specific tunnel
 packets



On 2019-08-01 11:40 AM, xiangxia.m.yue@...il.com wrote:
> 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)
> 

thanks!

Reviewed-by: Roi Dayan <roid@...lanox.com>