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/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 3ca9817..c6c30e2 100644 (file)
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -120,6 +120,7 @@ enum {
 #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
 
 #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 */
 
 struct bridge_vlan_info {
        u16 flags;

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index fe1980d..e044cc0 100644 (file)
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -120,6 +120,7 @@ static int br_fill_ifinfo(struct sk_buff *skb,
                const struct net_port_vlans *pv;
                struct bridge_vlan_info vinfo;
                u16 vid;
+               u16 pvid;
 
                if (port)
                        pv = nbp_get_vlan_info(port);
@@ -133,12 +134,15 @@ static int br_fill_ifinfo(struct sk_buff *skb,
                if (!af)
                        goto nla_put_failure;
 
+               pvid = br_get_pvid(pv);
                for (vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
                     vid < BR_VLAN_BITMAP_LEN;
                     vid = find_next_bit(pv->vlan_bitmap,
                                         BR_VLAN_BITMAP_LEN, vid+1)) {
                        vinfo.vid = vid;
                        vinfo.flags = 0;
+                       if (vid == pvid)
+                               vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
                        if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
                                    sizeof(vinfo), &vinfo))
                                goto nla_put_failure;
@@ -239,14 +243,15 @@ static int br_afspec(struct net_bridge *br,
                switch (cmd) {
                case RTM_SETLINK:
                        if (p) {
-                               err = nbp_vlan_add(p, vinfo->vid);
+                               err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
                                if (err)
                                        break;
 
                                if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
-                                       err = br_vlan_add(p->br, vinfo->vid);
+                                       err = br_vlan_add(p->br, vinfo->vid,
+                                                         vinfo->flags);
                        } else
-                               err = br_vlan_add(br, vinfo->vid);
+                               err = br_vlan_add(br, vinfo->vid, vinfo->flags);
 
                        if (err)
                                break;

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index ea8e7ef..1ae6395 100644 (file)
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -562,11 +562,11 @@ extern bool br_allowed_egress(struct net_bridge *br,
 extern struct sk_buff *br_handle_vlan(struct net_bridge *br,
                                      const struct net_port_vlans *v,
                                      struct sk_buff *skb);
-extern int br_vlan_add(struct net_bridge *br, u16 vid);
+extern int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 extern int br_vlan_delete(struct net_bridge *br, u16 vid);
 extern void br_vlan_flush(struct net_bridge *br);
 extern int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
-extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid);
+extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 extern int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 extern void nbp_vlan_flush(struct net_bridge_port *port);
 
@@ -633,7 +633,7 @@ static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
        return skb;
 }
 
-static inline int br_vlan_add(struct net_bridge *br, u16 vid)
+static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 {
        return -EOPNOTSUPP;
 }
@@ -647,7 +647,7 @@ static inline void br_vlan_flush(struct net_bridge *br)
 {
 }
 
-static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid)
+static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 {
        return -EOPNOTSUPP;
 }

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 20057de..c79940c 100644 (file)
--- 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 @@ static int __vlan_add(struct net_port_vlans *v, u16 vid)
 
        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 @@ static int __vlan_del(struct net_port_vlans *v, u16 vid)
        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 int __vlan_del(struct net_port_vlans *v, u16 vid)
 
 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 @@ bool br_allowed_egress(struct net_bridge *br,
 }
 
 /* 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 @@ int br_vlan_add(struct net_bridge *br, u16 vid)
 
        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 @@ int br_vlan_add(struct net_bridge *br, u16 vid)
                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 @@ void br_vlan_flush(struct net_bridge *br)
        struct net_port_vlans *pv;
 
        ASSERT_RTNL();
-
        pv = rtnl_dereference(br->vlan_info);
        if (!pv)
                return;
@@ -258,7 +285,7 @@ unlock:
 }
 
 /* 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 @@ int nbp_vlan_add(struct net_bridge_port *port, u16 vid)
 
        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 @@ int nbp_vlan_add(struct net_bridge_port *port, u16 vid)
 
        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;