bridge: netlink: export port's root id

Add IFLA_BRPORT_ROOT_ID to allow getting the designated root id via
netlink.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index c5b15bf..c45c1d7 100644 (file)
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -292,6 +292,7 @@ enum {
        IFLA_BRPORT_PROXYARP,   /* proxy ARP */
        IFLA_BRPORT_LEARNING_SYNC, /* mac learning sync from device */
        IFLA_BRPORT_PROXYARP_WIFI, /* proxy ARP for Wi-Fi */
+       IFLA_BRPORT_ROOT_ID,    /* designated root */
        __IFLA_BRPORT_MAX
 };
 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 330abf4..cad4050 100644 (file)
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -127,6 +127,7 @@ static inline size_t br_port_info_size(void)
                + nla_total_size(1)     /* IFLA_BRPORT_UNICAST_FLOOD */
                + nla_total_size(1)     /* IFLA_BRPORT_PROXYARP */
                + nla_total_size(1)     /* IFLA_BRPORT_PROXYARP_WIFI */
+               + nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_ROOT_ID */
                + 0;
 }
 
@@ -160,7 +161,9 @@ static int br_port_fill_attrs(struct sk_buff *skb,
            nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
            nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) ||
            nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI,
-                      !!(p->flags & BR_PROXYARP_WIFI)))
+                      !!(p->flags & BR_PROXYARP_WIFI)) ||
+           nla_put(skb, IFLA_BRPORT_ROOT_ID, sizeof(struct ifla_bridge_id),
+                   &p->designated_root))
                return -EMSGSIZE;
 
        return 0;