1 files changed, 58 insertions, 16 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 90a906e..1f8a59e 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2535,30 +2535,72 @@ EXPORT_SYMBOL(ndo_dflt_fdb_dump);
 
 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
 {
-	int idx = 0;
-	struct net *net = sock_net(skb->sk);
 	struct net_device *dev;
+	struct nlattr *tb[IFLA_MAX+1];
+	struct net_device *bdev = NULL;
+	struct net_device *br_dev = NULL;
+	const struct net_device_ops *ops = NULL;
+	const struct net_device_ops *cops = NULL;
+	struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
+	struct net *net = sock_net(skb->sk);
+	int brport_idx = 0;
+	int br_idx = 0;
+	int idx = 0;
+
+	if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
+			ifla_policy) == 0) {
+		if (tb[IFLA_MASTER])
+			br_idx = nla_get_u32(tb[IFLA_MASTER]);
+	}
+
+	brport_idx = ifm->ifi_index;
+
+	if (br_idx) {
+		br_dev = __dev_get_by_index(net, br_idx);
+		if (!br_dev)
+			return -ENODEV;
+
+		ops = br_dev->netdev_ops;
+		bdev = br_dev;
+	}
+
+	for_each_netdev(net, dev) {
+		if (brport_idx && (dev->ifindex != brport_idx))
+			continue;
+
+		if (!br_idx) { /* user did not specify a specific bridge */
+			if (dev->priv_flags & IFF_BRIDGE_PORT) {
+				br_dev = netdev_master_upper_dev_get(dev);
+				cops = br_dev->netdev_ops;
+			}
+
+			bdev = dev;
+		} else {
+			if (dev != br_dev &&
+			    !(dev->priv_flags & IFF_BRIDGE_PORT))
+				continue;
+
+			if (br_dev != netdev_master_upper_dev_get(dev) &&
+			    !(dev->priv_flags & IFF_EBRIDGE))
+				continue;
+
+			bdev = br_dev;
+			cops = ops;
+		}
 
-	rcu_read_lock();
-	for_each_netdev_rcu(net, dev) {
 		if (dev->priv_flags & IFF_BRIDGE_PORT) {
-			struct net_device *br_dev;
-			const struct net_device_ops *ops;
-
-			br_dev = netdev_master_upper_dev_get(dev);
-			ops = br_dev->netdev_ops;
-			if (ops->ndo_fdb_dump)
-				idx = ops->ndo_fdb_dump(skb, cb, dev, NULL,
-							idx);
+			if (cops && cops->ndo_fdb_dump)
+				idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
+							 idx);
 		}
 
+		idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
 		if (dev->netdev_ops->ndo_fdb_dump)
-			idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
+			idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, bdev, dev,
 							    idx);
-		else
-			idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
+
+		cops = NULL;
 	}
-	rcu_read_unlock();
 
 	cb->args[0] = idx;
 	return skb->len;