netdev - [net-next 14/14] net/mlx5: Avoid forwarding to other eswitch uplink

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Date:   Tue, 17 Mar 2020 19:47:22 -0700
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, kuba@...nel.org,
        Eli Cohen <eli@...lanox.com>, Oz Shlomo <ozsh@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 14/14] net/mlx5: Avoid forwarding to other eswitch uplink

From: Eli Cohen <eli@...lanox.com>

Do not allow forwarding of encapsulated traffic received from one eswtich's
uplink to another eswtich's uplink.

Signed-off-by: Eli Cohen <eli@...lanox.com>
Reviewed-by: Oz Shlomo <ozsh@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
index 608d0e07c308..b45c3f46570b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
@@ -66,6 +66,9 @@ static int get_route_and_out_devs(struct mlx5e_priv *priv,
 	      mlx5e_is_uplink_rep(netdev_priv(*out_dev))))
 		return -EOPNOTSUPP;
 
+	if (mlx5e_eswitch_uplink_rep(priv->netdev) && *out_dev != priv->netdev)
+		return -EOPNOTSUPP;
+
 	return 0;
 }
 
-- 
2.24.1