--- zzzz-none-000/linux-4.4.271/net/bridge/br_if.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/net/bridge/br_if.c	2023-04-19 10:22:30.000000000 +0000
@@ -1,4 +1,10 @@
 /*
+ **************************************************************************
+ * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+ **************************************************************************
+ */
+
+/*
  *	Userspace interface
  *	Linux ethernet bridge
  *
@@ -28,6 +34,10 @@
 
 #include "br_private.h"
 
+/* Hook for external forwarding logic */
+br_port_dev_get_hook_t __rcu *br_port_dev_get_hook __read_mostly;
+EXPORT_SYMBOL_GPL(br_port_dev_get_hook);
+
 /*
  * Determine initial path cost based on speed.
  * using recommendations from 802.1d standard
@@ -242,6 +252,7 @@
 	nbp_delete_promisc(p);
 
 	spin_lock_bh(&br->lock);
+	br_isol_remove_port(p);
 	br_stp_disable_port(p);
 	spin_unlock_bh(&br->lock);
 
@@ -334,7 +345,7 @@
 	p->path_cost = port_cost(dev);
 	p->priority = 0x8000 >> BR_PORT_BITS;
 	p->port_no = index;
-	p->flags = BR_LEARNING | BR_FLOOD;
+	p->flags = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
 	br_init_port(p);
 	br_set_state(p, BR_STATE_DISABLED);
 	br_stp_port_timer_init(p);
@@ -535,6 +546,7 @@
 	dev_set_mtu(br->dev, br_min_mtu(br));
 
 	kobject_uevent(&p->kobj, KOBJ_ADD);
+	call_netdevice_notifiers(NETDEV_BR_JOIN, dev);
 
 	return 0;
 
@@ -569,6 +581,8 @@
 	if (!p || p->br != br)
 		return -EINVAL;
 
+	call_netdevice_notifiers(NETDEV_BR_LEAVE, dev);
+
 	/* Since more than one interface can be attached to a bridge,
 	 * there still maybe an alternate path for netconsole to use;
 	 * therefore there is no reason for a NETDEV_RELEASE event.
@@ -596,3 +610,97 @@
 	if (mask & BR_AUTO_MASK)
 		nbp_update_port_count(br);
 }
+
+/* br_port_dev_get()
+ *      If a skb is provided, and the br_port_dev_get_hook_t hook exists,
+ *      use that to try and determine the egress port for that skb.
+ *      If not, or no egress port could be determined, use the given addr
+ *      to identify the port to which it is reachable,
+ *	returing a reference to the net device associated with that port.
+ *
+ * NOTE: Return NULL if given dev is not a bridge or the mac has no
+ * associated port.
+ */
+struct net_device *br_port_dev_get(struct net_device *dev, unsigned char *addr,
+				   struct sk_buff *skb,
+				   unsigned int cookie)
+{
+	struct net_bridge_fdb_entry *fdbe;
+	struct net_bridge *br;
+	struct net_device *netdev = NULL;
+
+	/* Is this a bridge? */
+	if (!(dev->priv_flags & IFF_EBRIDGE))
+		return NULL;
+
+	rcu_read_lock();
+
+	/* If the hook exists and the skb isn't NULL, try and get the port */
+	if (skb) {
+		br_port_dev_get_hook_t *port_dev_get_hook;
+
+		port_dev_get_hook = rcu_dereference(br_port_dev_get_hook);
+		if (port_dev_get_hook) {
+			struct net_bridge_port *pdst =
+				__br_get(port_dev_get_hook, NULL, dev, skb,
+					 addr, cookie);
+			if (pdst) {
+				dev_hold(pdst->dev);
+				netdev = pdst->dev;
+				goto out;
+			}
+		}
+	}
+
+	/* Either there is no hook, or can't
+	 * determine the port to use - fall back to using FDB
+	 */
+
+	br = netdev_priv(dev);
+
+	/* Lookup the fdb entry and get reference to the port dev */
+	fdbe = __br_fdb_get(br, addr, 0);
+	if (fdbe && fdbe->dst) {
+		netdev = fdbe->dst->dev; /* port device */
+		dev_hold(netdev);
+	}
+out:
+	rcu_read_unlock();
+	return netdev;
+}
+EXPORT_SYMBOL_GPL(br_port_dev_get);
+
+/* Update bridge statistics for bridge packets processed by offload engines */
+void br_dev_update_stats(struct net_device *dev,
+			 struct rtnl_link_stats64 *nlstats)
+{
+	struct net_bridge *br;
+	struct pcpu_sw_netstats *stats;
+
+	/* Is this a bridge? */
+	if (!(dev->priv_flags & IFF_EBRIDGE))
+		return;
+
+	br = netdev_priv(dev);
+	stats = per_cpu_ptr(br->stats, 0);
+
+	u64_stats_update_begin(&stats->syncp);
+	stats->rx_packets += nlstats->rx_packets;
+	stats->rx_bytes += nlstats->rx_bytes;
+	stats->tx_packets += nlstats->tx_packets;
+	stats->tx_bytes += nlstats->tx_bytes;
+	u64_stats_update_end(&stats->syncp);
+}
+EXPORT_SYMBOL_GPL(br_dev_update_stats);
+
+/* API to know if hairpin feature is enabled/disabled on this bridge port */
+bool br_is_hairpin_enabled(struct net_device *dev)
+{
+	struct net_bridge_port *port = br_port_get_check_rcu(dev);
+
+	if (likely(port))
+		return port->flags & BR_HAIRPIN_MODE;
+	return false;
+}
+EXPORT_SYMBOL_GPL(br_is_hairpin_enabled);
+