bridge: Add the ability to configure pvid
A user may designate a certain vlan as PVID. This means that
any ingress frame that does not contain a vlan tag is assigned to
this vlan and any forwarding decisions are made with this vlan in mind.
Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 20057de..c79940c 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -5,12 +5,33 @@
#include "br_private.h"
-static int __vlan_add(struct net_port_vlans *v, u16 vid)
+static void __vlan_add_pvid(struct net_port_vlans *v, u16 vid)
+{
+ if (v->pvid == vid)
+ return;
+
+ smp_wmb();
+ v->pvid = vid;
+}
+
+static void __vlan_delete_pvid(struct net_port_vlans *v, u16 vid)
+{
+ if (v->pvid != vid)
+ return;
+
+ smp_wmb();
+ v->pvid = 0;
+}
+
+static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
{
int err;
- if (test_bit(vid, v->vlan_bitmap))
- return -EEXIST;
+ if (test_bit(vid, v->vlan_bitmap)) {
+ if (flags & BRIDGE_VLAN_INFO_PVID)
+ __vlan_add_pvid(v, vid);
+ return 0;
+ }
if (v->port_idx && vid) {
struct net_device *dev = v->parent.port->dev;
@@ -29,6 +50,9 @@
set_bit(vid, v->vlan_bitmap);
v->num_vlans++;
+ if (flags & BRIDGE_VLAN_INFO_PVID)
+ __vlan_add_pvid(v, vid);
+
return 0;
}
@@ -37,6 +61,8 @@
if (!test_bit(vid, v->vlan_bitmap))
return -EINVAL;
+ __vlan_delete_pvid(v, vid);
+
if (v->port_idx && vid) {
struct net_device *dev = v->parent.port->dev;
@@ -58,6 +84,8 @@
static void __vlan_flush(struct net_port_vlans *v)
{
+ smp_wmb();
+ v->pvid = 0;
bitmap_zero(v->vlan_bitmap, BR_VLAN_BITMAP_LEN);
if (v->port_idx)
rcu_assign_pointer(v->parent.port->vlan_info, NULL);
@@ -185,7 +213,7 @@
}
/* Must be protected by RTNL */
-int br_vlan_add(struct net_bridge *br, u16 vid)
+int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
{
struct net_port_vlans *pv = NULL;
int err;
@@ -194,7 +222,7 @@
pv = rtnl_dereference(br->vlan_info);
if (pv)
- return __vlan_add(pv, vid);
+ return __vlan_add(pv, vid, flags);
/* Create port vlan infomration
*/
@@ -203,7 +231,7 @@
return -ENOMEM;
pv->parent.br = br;
- err = __vlan_add(pv, vid);
+ err = __vlan_add(pv, vid, flags);
if (err)
goto out;
@@ -234,7 +262,6 @@
struct net_port_vlans *pv;
ASSERT_RTNL();
-
pv = rtnl_dereference(br->vlan_info);
if (!pv)
return;
@@ -258,7 +285,7 @@
}
/* Must be protected by RTNL */
-int nbp_vlan_add(struct net_bridge_port *port, u16 vid)
+int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
{
struct net_port_vlans *pv = NULL;
int err;
@@ -267,7 +294,7 @@
pv = rtnl_dereference(port->vlan_info);
if (pv)
- return __vlan_add(pv, vid);
+ return __vlan_add(pv, vid, flags);
/* Create port vlan infomration
*/
@@ -279,7 +306,7 @@
pv->port_idx = port->port_no;
pv->parent.port = port;
- err = __vlan_add(pv, vid);
+ err = __vlan_add(pv, vid, flags);
if (err)
goto clean_up;