netdev - [PATCH net-next 02/12] mlxsw: spectrum_span: Ignore VLAN entries not used by the bridge in mirroring

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Date:   Tue, 22 Feb 2022 19:16:53 +0200
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, petrm@...dia.com,
        jiri@...dia.com, danieller@...dia.com, vadimp@...dia.com,
        Ido Schimmel <idosch@...dia.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH net-next 02/12] mlxsw: spectrum_span: Ignore VLAN entries not used by the bridge in mirroring

Only VLAN entries installed on the bridge device itself should be
considered when checking whether a packet with a specific VLAN can be
mirrored via a bridge device. VLAN entries only used to keep context
(i.e., entries with 'BRIDGE_VLAN_INFO_BRENTRY' unset) should be ignored.

Fix this by preventing mirroring when the VLAN entry does not have the
'BRIDGE_VLAN_INFO_BRENTRY' flag set.

Fixes: ddaff5047003 ("mlxsw: spectrum: remove guards against !BRIDGE_VLAN_INFO_BRENTRY")
Signed-off-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Petr Machata <petrm@...dia.com>
---
Cc: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index 5459490c7790..b73466470f75 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -269,7 +269,8 @@ mlxsw_sp_span_entry_bridge_8021q(const struct net_device *br_dev,
 
 	if (!vid && WARN_ON(br_vlan_get_pvid(br_dev, &vid)))
 		return NULL;
-	if (!vid || br_vlan_get_info(br_dev, vid, &vinfo))
+	if (!vid || br_vlan_get_info(br_dev, vid, &vinfo) ||
+	    !(vinfo.flags & BRIDGE_VLAN_INFO_BRENTRY))
 		return NULL;
 
 	edev = br_fdb_find_port(br_dev, dmac, vid);
-- 
2.33.1