netdev - [patch net-next v2 2/2] mlxsw: spectrum: remove FDB entry in case we get unknown object notification

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1452163830-20425-2-git-send-email-jiri@resnulli.us>
Date:	Thu,  7 Jan 2016 11:50:30 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, idosch@...lanox.com, eladr@...lanox.com,
	yotamg@...lanox.com, ogerlitz@...lanox.com
Subject: [patch net-next v2 2/2] mlxsw: spectrum: remove FDB entry in case we get unknown object notification

From: Jiri Pirko <jiri@...lanox.com>

It may happen that we get notification for FDB entry for object (port,
lag, vport), which does not exist. Currently we ignore that, which only
causes this being re-sent in next notification. The entry will never
disappear. So get rid of it by simply removing it using SFD register.

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
Reviewed-by: Ido Schimmel <idosch@...lanox.com>
---
v1->v2:
- fixing impossible mlxsw_sp_port null dereference
---
 .../ethernet/mellanox/mlxsw/spectrum_switchdev.c   | 38 +++++++++++++++++-----
 1 file changed, 30 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index 5150e9e..d64559e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -1030,13 +1030,14 @@ static void mlxsw_sp_fdb_notify_mac_process(struct mlxsw_sp *mlxsw_sp,
 	char mac[ETH_ALEN];
 	u8 local_port;
 	u16 vid, fid;
+	bool do_notification = true;
 	int err;
 
 	mlxsw_reg_sfn_mac_unpack(sfn_pl, rec_index, mac, &fid, &local_port);
 	mlxsw_sp_port = mlxsw_sp->ports[local_port];
 	if (!mlxsw_sp_port) {
 		dev_err_ratelimited(mlxsw_sp->bus_info->dev, "Incorrect local port in FDB notification\n");
-		return;
+		goto just_remove;
 	}
 
 	if (mlxsw_sp_fid_is_vfid(fid)) {
@@ -1047,9 +1048,8 @@ static void mlxsw_sp_fdb_notify_mac_process(struct mlxsw_sp *mlxsw_sp,
 								  vfid);
 		if (!mlxsw_sp_vport) {
 			netdev_err(mlxsw_sp_port->dev, "Failed to find a matching vPort following FDB notification\n");
-			return;
+			goto just_remove;
 		}
-
 		vid = mlxsw_sp_vport_vid_get(mlxsw_sp_vport);
 		/* Override the physical port with the vPort. */
 		mlxsw_sp_port = mlxsw_sp_vport;
@@ -1057,17 +1057,28 @@ static void mlxsw_sp_fdb_notify_mac_process(struct mlxsw_sp *mlxsw_sp,
 		vid = fid;
 	}
 
+	adding = adding && mlxsw_sp_port->learning;
+
+do_fdb_op:
 	err = mlxsw_sp_port_fdb_uc_op(mlxsw_sp, local_port, mac, fid,
-				      adding && mlxsw_sp_port->learning, true);
+				      adding, true);
 	if (err) {
 		if (net_ratelimit())
 			netdev_err(mlxsw_sp_port->dev, "Failed to set FDB entry\n");
 		return;
 	}
 
+	if (!do_notification)
+		return;
 	mlxsw_sp_fdb_call_notifiers(mlxsw_sp_port->learning,
 				    mlxsw_sp_port->learning_sync,
 				    adding, mac, vid, mlxsw_sp_port->dev);
+	return;
+
+just_remove:
+	adding = false;
+	do_notification = false;
+	goto do_fdb_op;
 }
 
 static void mlxsw_sp_fdb_notify_mac_lag_process(struct mlxsw_sp *mlxsw_sp,
@@ -1079,13 +1090,14 @@ static void mlxsw_sp_fdb_notify_mac_lag_process(struct mlxsw_sp *mlxsw_sp,
 	u16 lag_vid = 0;
 	u16 lag_id;
 	u16 vid, fid;
+	bool do_notification = true;
 	int err;
 
 	mlxsw_reg_sfn_mac_lag_unpack(sfn_pl, rec_index, mac, &fid, &lag_id);
 	mlxsw_sp_port = mlxsw_sp_lag_rep_port(mlxsw_sp, lag_id);
 	if (!mlxsw_sp_port) {
 		dev_err_ratelimited(mlxsw_sp->bus_info->dev, "Cannot find port representor for LAG\n");
-		return;
+		goto just_remove;
 	}
 
 	if (mlxsw_sp_fid_is_vfid(fid)) {
@@ -1096,7 +1108,7 @@ static void mlxsw_sp_fdb_notify_mac_lag_process(struct mlxsw_sp *mlxsw_sp,
 								  vfid);
 		if (!mlxsw_sp_vport) {
 			netdev_err(mlxsw_sp_port->dev, "Failed to find a matching vPort following FDB notification\n");
-			return;
+			goto just_remove;
 		}
 
 		vid = mlxsw_sp_vport_vid_get(mlxsw_sp_vport);
@@ -1107,19 +1119,29 @@ static void mlxsw_sp_fdb_notify_mac_lag_process(struct mlxsw_sp *mlxsw_sp,
 		vid = fid;
 	}
 
+	adding = adding && mlxsw_sp_port->learning;
+
+do_fdb_op:
 	err = mlxsw_sp_port_fdb_uc_lag_op(mlxsw_sp, lag_id, mac, fid, lag_vid,
-					  adding && mlxsw_sp_port->learning,
-					  true);
+					  adding, true);
 	if (err) {
 		if (net_ratelimit())
 			netdev_err(mlxsw_sp_port->dev, "Failed to set FDB entry\n");
 		return;
 	}
 
+	if (!do_notification)
+		return;
 	mlxsw_sp_fdb_call_notifiers(mlxsw_sp_port->learning,
 				    mlxsw_sp_port->learning_sync,
 				    adding, mac, vid,
 				    mlxsw_sp_lag_get(mlxsw_sp, lag_id)->dev);
+	return;
+
+just_remove:
+	adding = false;
+	do_notification = false;
+	goto do_fdb_op;
 }
 
 static void mlxsw_sp_fdb_notify_rec_process(struct mlxsw_sp *mlxsw_sp,
-- 
1.9.3

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html