linux-kernel - [PATCH v3] ixgbe: make VLAN filter conditional

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Message-ID: <7F861DC0615E0C47A872E6F3C5FCDDBD05E555F3@BPXM14GP.gisp.nec.co.jp>
Date:	Wed, 11 Mar 2015 00:59:50 +0000
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
CC:	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Choi, Sy Jong" <sy.jong.choi@...el.com>,
	Hayato Momma <h-momma@...jp.nec.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ben@...adent.org.uk" <ben@...adent.org.uk>
Subject: [PATCH v3] ixgbe: make VLAN filter conditional

From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>

Disable hardware VLAN filtering if netdev->features VLAN flag is dropped.

In SR-IOV case, there is a use case which needs to disable VLAN filter.
For example, we need to make a network function with VF in virtualized
environment. That network function may be a software switch, a router
or etc. It means that that network function will be an end point which
terminates many VLANs.

In the current implementation, VLAN filtering always be turned on and
VF can receive only 63 VLANs. It means that only 63 VLANs can be terminated
in one NIC.

On the other hand disabling HW VLAN filtering causes a SECURITY issue
that each VF can receive all VLAN packets. That means that a VF can see
any packet which is sent to other VF.

This VLAN filtering can be turned off when SR-IOV is disabled, if not
the operation is rejected, to prevent unexpected behavior.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Reviewed-by: Hayato Momma <h-momma@...jp.nec.com>
CC: Choi, Sy Jong <sy.jong.choi@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c  | 26 ++++++++++++++++++++++++++
 drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c |  4 ++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index cd5a2c5..2f7bbb2 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4079,6 +4079,10 @@ void ixgbe_set_rx_mode(struct net_device *netdev)
 		hw->addr_ctrl.user_set_promisc = false;
 	}
 
+	/* Disable hardware VLAN filter if the feature flag is dropped */
+	if (!(netdev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
+		vlnctrl &= ~(IXGBE_VLNCTRL_VFE | IXGBE_VLNCTRL_CFIEN);
+
 	/*
 	 * Write addresses to available RAR registers, if there is not
 	 * sufficient space to store all the addresses then enable
@@ -7736,6 +7740,28 @@ static int ixgbe_set_features(struct net_device *netdev,
 	netdev_features_t changed = netdev->features ^ features;
 	bool need_reset = false;
 
+	if (changed & NETIF_F_HW_VLAN_CTAG_FILTER) {
+		int vlan_filter = features & NETIF_F_HW_VLAN_CTAG_FILTER;
+
+		/* Prevent controlling VLAN filter if VFs exist */
+		if (adapter->num_vfs > 0) {
+			e_dev_info("%s HW VLAN filter is not allowed when "
+				   "SR-IOV enabled.\n",
+				   vlan_filter ? "Enabling" : "Disabling");
+			return -EINVAL;
+		}
+		if (!vlan_filter) {
+			e_dev_warn("Disabling HW VLAN filter. This cause "
+				   "SERIOUS SECURITY issues.\n");
+			e_dev_warn("Every VF users can receive a packet to "
+				   "other VFs.\n");
+			e_dev_warn("You cannot turn it on again if you are "
+				   "using SR-IOV.\n");
+		}
+		/* reset if HW VLAN filter is changed */
+		need_reset = true;
+	}
+
 	/* Make sure RSC matches LRO, reset if change */
 	if (!(features & NETIF_F_LRO)) {
 		if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index 2d98ecd..f3a315c 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -787,6 +787,10 @@ static int ixgbe_set_vf_vlan_msg(struct ixgbe_adapter *adapter,
 	u32 bits;
 	u8 tcs = netdev_get_num_tc(adapter->netdev);
 
+	/* Ignore if VLAN filter is disabled */
+	if (!(adapter->netdev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
+		return 0;
+
 	if (adapter->vfinfo[vf].pf_vlan || tcs) {
 		e_warn(drv,
 		       "VF %d attempted to override administratively set VLAN configuration\n"
-- 
2.1.0