v4.19.13 snapshot.
diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
new file mode 100644
index 0000000..c20c7e1
--- /dev/null
+++ b/include/linux/if_bridge.h
@@ -0,0 +1,132 @@
+/*
+ * Linux ethernet bridge
+ *
+ * Authors:
+ * Lennert Buytenhek <buytenh@gnu.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _LINUX_IF_BRIDGE_H
+#define _LINUX_IF_BRIDGE_H
+
+
+#include <linux/netdevice.h>
+#include <uapi/linux/if_bridge.h>
+#include <linux/bitops.h>
+
+struct br_ip {
+ union {
+ __be32 ip4;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct in6_addr ip6;
+#endif
+ } u;
+ __be16 proto;
+ __u16 vid;
+};
+
+struct br_ip_list {
+ struct list_head list;
+ struct br_ip addr;
+};
+
+#define BR_HAIRPIN_MODE BIT(0)
+#define BR_BPDU_GUARD BIT(1)
+#define BR_ROOT_BLOCK BIT(2)
+#define BR_MULTICAST_FAST_LEAVE BIT(3)
+#define BR_ADMIN_COST BIT(4)
+#define BR_LEARNING BIT(5)
+#define BR_FLOOD BIT(6)
+#define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
+#define BR_PROMISC BIT(7)
+#define BR_PROXYARP BIT(8)
+#define BR_LEARNING_SYNC BIT(9)
+#define BR_PROXYARP_WIFI BIT(10)
+#define BR_MCAST_FLOOD BIT(11)
+#define BR_MULTICAST_TO_UNICAST BIT(12)
+#define BR_VLAN_TUNNEL BIT(13)
+#define BR_BCAST_FLOOD BIT(14)
+#define BR_NEIGH_SUPPRESS BIT(15)
+#define BR_ISOLATED BIT(16)
+
+#define BR_DEFAULT_AGEING_TIME (300 * HZ)
+
+extern void brioctl_set(int (*ioctl_hook)(struct net *, unsigned int, void __user *));
+
+typedef int br_should_route_hook_t(struct sk_buff *skb);
+extern br_should_route_hook_t __rcu *br_should_route_hook;
+
+#if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)
+int br_multicast_list_adjacent(struct net_device *dev,
+ struct list_head *br_ip_list);
+bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto);
+bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto);
+bool br_multicast_enabled(const struct net_device *dev);
+bool br_multicast_router(const struct net_device *dev);
+#else
+static inline int br_multicast_list_adjacent(struct net_device *dev,
+ struct list_head *br_ip_list)
+{
+ return 0;
+}
+static inline bool br_multicast_has_querier_anywhere(struct net_device *dev,
+ int proto)
+{
+ return false;
+}
+static inline bool br_multicast_has_querier_adjacent(struct net_device *dev,
+ int proto)
+{
+ return false;
+}
+static inline bool br_multicast_enabled(const struct net_device *dev)
+{
+ return false;
+}
+static inline bool br_multicast_router(const struct net_device *dev)
+{
+ return false;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)
+bool br_vlan_enabled(const struct net_device *dev);
+int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid);
+int br_vlan_get_info(const struct net_device *dev, u16 vid,
+ struct bridge_vlan_info *p_vinfo);
+#else
+static inline bool br_vlan_enabled(const struct net_device *dev)
+{
+ return false;
+}
+
+static inline int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
+{
+ return -EINVAL;
+}
+
+static inline int br_vlan_get_info(const struct net_device *dev, u16 vid,
+ struct bridge_vlan_info *p_vinfo)
+{
+ return -EINVAL;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_BRIDGE)
+struct net_device *br_fdb_find_port(const struct net_device *br_dev,
+ const unsigned char *addr,
+ __u16 vid);
+#else
+static inline struct net_device *
+br_fdb_find_port(const struct net_device *br_dev,
+ const unsigned char *addr,
+ __u16 vid)
+{
+ return NULL;
+}
+#endif
+
+#endif