bridge: skip fdb add if the port shouldn't learn

Check in fdb_add_entry() if the source port should learn, similar
check is used in br_fdb_update.
Note that new fdb entries which are added manually or
as local ones are still permitted.
This patch has been tested by running traffic via a bridge port and
switching the port's state, also by manually adding/removing entries
from the bridge's fdb.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index e0670d7054f9..7896cf143045 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -736,6 +736,12 @@ static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
         struct net_bridge_fdb_entry *fdb;
         bool modified = false;
 
+        /* If the port cannot learn allow only local and static entries */
+        if (!(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
+            !(source->state == BR_STATE_LEARNING ||
+              source->state == BR_STATE_FORWARDING))
+                return -EPERM;
+
         fdb = fdb_find(head, addr, vid);
         if (fdb == NULL) {
                 if (!(flags & NLM_F_CREATE))