bridge: Add a flag to control unicast packet flood.

Add a flag to control flood of unicast traffic.  By default, flood is
on and the bridge will flood unicast traffic if it doesn't know
the destination.  When the flag is turned off, unicast traffic
without an FDB will not be forwarded to the specified port.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index ce902bf8a618..1fc30abd3a52 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -31,6 +31,7 @@ static inline size_t br_port_info_size(void)
                 + nla_total_size(1)     /* IFLA_BRPORT_PROTECT */
                 + nla_total_size(1)     /* IFLA_BRPORT_FAST_LEAVE */
                 + nla_total_size(1)     /* IFLA_BRPORT_LEARNING */
+                + nla_total_size(1)     /* IFLA_BRPORT_UNICAST_FLOOD */
                 + 0;
 }
 
@@ -58,7 +59,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
             nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
             nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
             nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
-            nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)))
+            nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
+            nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)))
                 return -EMSGSIZE;
 
         return 0;
@@ -284,6 +286,7 @@ static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
         [IFLA_BRPORT_GUARD]     = { .type = NLA_U8 },
         [IFLA_BRPORT_PROTECT]   = { .type = NLA_U8 },
         [IFLA_BRPORT_LEARNING]  = { .type = NLA_U8 },
+        [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
 };
 
 /* Change the state of the port and notify spanning tree */
@@ -332,6 +335,7 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
         br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
         br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
         br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
+        br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
 
         if (tb[IFLA_BRPORT_COST]) {
                 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));