bridge: netlink: export topology_change and topology_change_detected

Add IFLA_BR_TOPOLOGY_CHANGE and IFLA_BR_TOPOLOGY_CHANGE_DETECTED and
export them via netlink.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/if_link.h

@@ -237,6 +237,8 @@ enum {
 	IFLA_BR_BRIDGE_ID,
 	IFLA_BR_ROOT_PORT,
 	IFLA_BR_ROOT_PATH_COST,
+	IFLA_BR_TOPOLOGY_CHANGE,
+	IFLA_BR_TOPOLOGY_CHANGE_DETECTED,
 	__IFLA_BR_MAX,
 };
 

net/bridge/br_netlink.c

@@ -858,6 +858,8 @@ static size_t br_get_size(const struct net_device *brdev)
 	       nla_total_size(sizeof(struct ifla_bridge_id)) +   /* IFLA_BR_BRIDGE_ID */
 	       nla_total_size(sizeof(u16)) +    /* IFLA_BR_ROOT_PORT */
 	       nla_total_size(sizeof(u32)) +    /* IFLA_BR_ROOT_PATH_COST */
+	       nla_total_size(sizeof(u8)) +    /* IFLA_BR_TOPOLOGY_CHANGE */
+	       nla_total_size(sizeof(u8)) +    /* IFLA_BR_TOPOLOGY_CHANGE_DETECTED */
 	       0;
 }
 
@@ -892,7 +894,10 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 	    nla_put(skb, IFLA_BR_ROOT_ID, sizeof(root_id), &root_id) ||
 	    nla_put(skb, IFLA_BR_BRIDGE_ID, sizeof(bridge_id), &bridge_id) ||
 	    nla_put_u16(skb, IFLA_BR_ROOT_PORT, br->root_port) ||
-	    nla_put_u32(skb, IFLA_BR_ROOT_PATH_COST, br->root_path_cost))
+	    nla_put_u32(skb, IFLA_BR_ROOT_PATH_COST, br->root_path_cost) ||
+	    nla_put_u8(skb, IFLA_BR_TOPOLOGY_CHANGE, br->topology_change) ||
+	    nla_put_u8(skb, IFLA_BR_TOPOLOGY_CHANGE_DETECTED,
+		       br->topology_change_detected))
 		return -EMSGSIZE;
 
 #ifdef CONFIG_BRIDGE_VLAN_FILTERING