bridge: Properly check if local fdb entry can be deleted in br_fdb_delete_by_port

br_fdb_delete_by_port() doesn't care about vlan and mac address of the
bridge device.

As the check is almost the same as mac address changing, slightly modify
fdb_delete_local() and use it.

Note that we can always set added_by_user to 0 in fdb_delete_local() because
- br_fdb_delete_by_port() calls fdb_delete_local() for local entries
  regardless of its added_by_user. In this case, we have to check if another
  port has the same address and vlan, and if found, we have to create the
  entry (by changing dst). This is kernel-added entry, not user-added.
- br_fdb_changeaddr() doesn't call fdb_delete_local() for user-added entry.

Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Acked-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 15bf13d..43e54d1 100644 (file)
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -103,6 +103,7 @@ static void fdb_delete_local(struct net_bridge *br,
                if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
                    (!vid || nbp_vlan_find(op, vid))) {
                        f->dst = op;
+                       f->added_by_user = 0;
                        return;
                }
        }
@@ -111,6 +112,7 @@ static void fdb_delete_local(struct net_bridge *br,
        if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
            (!vid || br_vlan_find(br, vid))) {
                f->dst = NULL;
+               f->added_by_user = 0;
                return;
        }
 
@@ -261,26 +263,11 @@ void br_fdb_delete_by_port(struct net_bridge *br,
 
                        if (f->is_static && !do_all)
                                continue;
-                       /*
-                        * if multiple ports all have the same device address
-                        * then when one port is deleted, assign
-                        * the local entry to other port
-                        */
-                       if (f->is_local) {
-                               struct net_bridge_port *op;
-                               list_for_each_entry(op, &br->port_list, list) {
-                                       if (op != p &&
-                                           ether_addr_equal(op->dev->dev_addr,
-                                                            f->addr.addr)) {
-                                               f->dst = op;
-                                               f->added_by_user = 0;
-                                               goto skip_delete;
-                                       }
-                               }
-                       }
 
-                       fdb_delete(br, f);
-               skip_delete: ;
+                       if (f->is_local)
+                               fdb_delete_local(br, p, f);
+                       else
+                               fdb_delete(br, f);
                }
        }
        spin_unlock_bh(&br->hash_lock);