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bridge: Separate egress policy bitmap

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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>
This commit is contained in:
Vlad Yasevich 2013-02-13 12:00:20 +00:00 • committed by David S. Miller
commit 35e03f3a02
4 changed files with 20 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/uapi/linux/if_bridge.h
View file

@ -121,6 +121,7 @@ enum {
#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;

4
net/bridge/br_netlink.c
View file

@ -143,6 +143,10 @@ static int br_fill_ifinfo(struct sk_buff *skb,
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;

1
net/bridge/br_private.h
View file

@ -75,6 +75,7 @@ struct net_port_vlans {
} parent;
struct rcu_head rcu;
unsigned long vlan_bitmap[BR_VLAN_BITMAP_LEN];
unsigned long untagged_bitmap[BR_VLAN_BITMAP_LEN];
u16 num_vlans;
};

20
net/bridge/br_vlan.c
View file

@ -23,6 +23,15 @@ static void __vlan_delete_pvid(struct net_port_vlans *v, u16 vid)
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 @@ static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
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 @@ static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
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 @@ static int __vlan_del(struct net_port_vlans *v, u16 vid)
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 @@ struct sk_buff *br_handle_vlan(struct net_bridge *br,
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