bridge: Separate egress policy bitmap
Add an ability to configure a separate "untagged" egress
policy to the VLAN information of the bridge. This superseeds PVID
policy and makes PVID ingress-only. The policy is configured with a
new flag and is represented as a port bitmap per vlan. Egress frames
with a VLAN id in "untagged" policy bitmap would egress
the port without VLAN header.
Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index c6c30e2..f1bf8d3 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -121,6 +121,7 @@
#define BRIDGE_VLAN_INFO_MASTER (1<<0) /* Operate on Bridge device as well */
#define BRIDGE_VLAN_INFO_PVID (1<<1) /* VLAN is PVID, ingress untagged */
+#define BRIDGE_VLAN_INFO_UNTAGGED (1<<2) /* VLAN egresses untagged */
struct bridge_vlan_info {
u16 flags;
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index e044cc0..d1dda47 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -143,6 +143,10 @@
vinfo.flags = 0;
if (vid == pvid)
vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
+
+ if (test_bit(vid, pv->untagged_bitmap))
+ vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
+
if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
sizeof(vinfo), &vinfo))
goto nla_put_failure;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 32ecfa4..6d314c4 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -75,6 +75,7 @@
} parent;
struct rcu_head rcu;
unsigned long vlan_bitmap[BR_VLAN_BITMAP_LEN];
+ unsigned long untagged_bitmap[BR_VLAN_BITMAP_LEN];
u16 num_vlans;
};
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 9ea358f..93dde75 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -23,6 +23,15 @@
v->pvid = 0;
}
+static void __vlan_add_flags(struct net_port_vlans *v, u16 vid, u16 flags)
+{
+ if (flags & BRIDGE_VLAN_INFO_PVID)
+ __vlan_add_pvid(v, vid);
+
+ if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
+ set_bit(vid, v->untagged_bitmap);
+}
+
static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
{
struct net_bridge_port *p = NULL;
@@ -31,8 +40,7 @@
int err;
if (test_bit(vid, v->vlan_bitmap)) {
- if (flags & BRIDGE_VLAN_INFO_PVID)
- __vlan_add_pvid(v, vid);
+ __vlan_add_flags(v, vid, flags);
return 0;
}
@@ -69,8 +77,7 @@
set_bit(vid, v->vlan_bitmap);
v->num_vlans++;
- if (flags & BRIDGE_VLAN_INFO_PVID)
- __vlan_add_pvid(v, vid);
+ __vlan_add_flags(v, vid, flags);
return 0;
@@ -86,6 +93,7 @@
return -EINVAL;
__vlan_delete_pvid(v, vid);
+ clear_bit(vid, v->untagged_bitmap);
if (v->port_idx && vid) {
struct net_device *dev = v->parent.port->dev;
@@ -144,11 +152,11 @@
goto out;
/* At this point, we know that the frame was filtered and contains
- * a valid vlan id. If the vlan id matches the pvid of current port
+ * a valid vlan id. If the vlan id is set in the untagged bitmap,
* send untagged; otherwise, send taged.
*/
br_vlan_get_tag(skb, &vid);
- if (vid == br_get_pvid(pv))
+ if (test_bit(vid, pv->untagged_bitmap))
skb = br_vlan_untag(skb);
else {
/* Egress policy says "send tagged". If output device