net: bridge: Publish bridge accessor functions

Add a couple new functions to allow querying FDB and vlan settings of a
bridge.

Signed-off-by: Petr Machata <[email protected]>
Signed-off-by: Ido Schimmel <[email protected]>
Signed-off-by: Nikolay Aleksandrov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: pmachata

include/linux/if_bridge.h

@@ -93,11 +93,39 @@ static inline bool br_multicast_router(const struct net_device *dev)
 
 #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)
 bool br_vlan_enabled(const struct net_device *dev);
+int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid);
+int br_vlan_get_info(const struct net_device *dev, u16 vid,
+		     struct bridge_vlan_info *p_vinfo);
 #else
 static inline bool br_vlan_enabled(const struct net_device *dev)
 {
 	return false;
 }
+
+static inline int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
+{
+	return -1;
+}
+
+static inline int br_vlan_get_info(const struct net_device *dev, u16 vid,
+				   struct bridge_vlan_info *p_vinfo)
+{
+	return -1;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_BRIDGE)
+struct net_device *br_fdb_find_port(const struct net_device *br_dev,
+				    const unsigned char *addr,
+				    __u16 vid);
+#else
+static inline struct net_device *
+br_fdb_find_port(const struct net_device *br_dev,
+		 const unsigned char *addr,
+		 __u16 vid)
+{
+	return NULL;
+}
 #endif
 
 #endif

net/bridge/br_fdb.c

@@ -121,6 +121,28 @@ static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
 	return fdb;
 }
 
+struct net_device *br_fdb_find_port(const struct net_device *br_dev,
+				    const unsigned char *addr,
+				    __u16 vid)
+{
+	struct net_bridge_fdb_entry *f;
+	struct net_device *dev = NULL;
+	struct net_bridge *br;
+
+	ASSERT_RTNL();
+
+	if (!netif_is_bridge_master(br_dev))
+		return NULL;
+
+	br = netdev_priv(br_dev);
+	f = br_fdb_find(br, addr, vid);
+	if (f && f->dst)
+		dev = f->dst->dev;
+
+	return dev;
+}
+EXPORT_SYMBOL_GPL(br_fdb_find_port);
+
 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 					     const unsigned char *addr,
 					     __u16 vid)

net/bridge/br_private.h

@@ -594,11 +594,22 @@ static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 	return rcu_dereference(dev->rx_handler) == br_handle_frame;
 }
 
+static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
+{
+	return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame;
+}
+
 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 {
 	return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 }
 
+static inline struct net_bridge_port *
+br_port_get_check_rtnl(const struct net_device *dev)
+{
+	return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
+}
+
 /* br_ioctl.c */
 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,

net/bridge/br_vlan.c

@@ -1149,3 +1149,42 @@ void br_vlan_get_stats(const struct net_bridge_vlan *v,
 		stats->tx_packets += txpackets;
 	}
 }
+
+int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
+{
+	struct net_bridge_vlan_group *vg;
+
+	ASSERT_RTNL();
+	if (netif_is_bridge_master(dev))
+		vg = br_vlan_group(netdev_priv(dev));
+	else
+		return -EINVAL;
+
+	*p_pvid = br_get_pvid(vg);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(br_vlan_get_pvid);
+
+int br_vlan_get_info(const struct net_device *dev, u16 vid,
+		     struct bridge_vlan_info *p_vinfo)
+{
+	struct net_bridge_vlan_group *vg;
+	struct net_bridge_vlan *v;
+	struct net_bridge_port *p;
+
+	ASSERT_RTNL();
+	p = br_port_get_check_rtnl(dev);
+	if (p)
+		vg = nbp_vlan_group(p);
+	else
+		return -EINVAL;
+
+	v = br_vlan_find(vg, vid);
+	if (!v)
+		return -ENOENT;
+
+	p_vinfo->vid = vid;
+	p_vinfo->flags = v->flags;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(br_vlan_get_info);