net/bridge/br_private.h - kernel/windcharger - Git at Google

 /*
  *	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 _BR_PRIVATE_H
 #define _BR_PRIVATE_H

 #include <linux/netdevice.h>
 #include <linux/if_bridge.h>
 #include <linux/netpoll.h>
 #include <linux/u64_stats_sync.h>
 #include <net/route.h>
 #include <linux/export.h>

 #define BR_HASH_BITS 8
 #define BR_HASH_SIZE (1 << BR_HASH_BITS)

 #define BR_HOLD_TIME (1*HZ)

 #define BR_PORT_BITS	10
 #define BR_MAX_PORTS	(1<<BR_PORT_BITS)

 #define BR_VERSION	"2.3"

 /* Control of forwarding link local multicast */
 #define BR_GROUPFWD_DEFAULT	0
 /* Don't allow forwarding control protocols like STP and LLDP */
 #define BR_GROUPFWD_RESTRICTED	0x4007u

 /* Path to usermode spanning tree program */
 #define BR_STP_PROG	"/sbin/bridge-stp"

 typedef struct bridge_id bridge_id;
 typedef struct mac_addr mac_addr;
 typedef __u16 port_id;

 struct bridge_id
 {
 	unsigned char	prio[2];
 	unsigned char	addr[6];
 };

 struct mac_addr
 {
 	unsigned char	addr[6];
 };

 struct br_ip
 {
 	union {
 		__be32	ip4;
 #if IS_ENABLED(CONFIG_IPV6)
 		struct in6_addr ip6;
 #endif
 	} u;
 	__be16		proto;
 };

 struct net_bridge_fdb_entry
 {
 	struct hlist_node		hlist;
 	struct net_bridge_port		*dst;

 	struct rcu_head			rcu;
 	unsigned long			updated;
 	unsigned long			used;
 	mac_addr			addr;
 	unsigned char			is_local;
 	unsigned char			is_static;
 };

 struct net_bridge_port_group {
 	struct net_bridge_port		*port;
 	struct net_bridge_port_group __rcu *next;
 	struct hlist_node		mglist;
 	struct rcu_head			rcu;
 	struct timer_list		timer;
 	struct br_ip			addr;
 };

 struct net_bridge_mdb_entry
 {
 	struct hlist_node		hlist[2];
 	struct net_bridge		*br;
 	struct net_bridge_port_group __rcu *ports;
 	struct rcu_head			rcu;
 	struct timer_list		timer;
 	struct br_ip			addr;
 	bool				mglist;
 };

 struct net_bridge_mdb_htable
 {
 	struct hlist_head		*mhash;
 	struct rcu_head			rcu;
 	struct net_bridge_mdb_htable	*old;
 	u32				size;
 	u32				max;
 	u32				secret;
 	u32				ver;
 };

 struct net_bridge_port
 {
 	struct net_bridge		*br;
 	struct net_device		*dev;
 	struct list_head		list;

 	/* STP */
 	u8				priority;
 	u8				state;
 	u16				port_no;
 	unsigned char			topology_change_ack;
 	unsigned char			config_pending;
 	port_id				port_id;
 	port_id				designated_port;
 	bridge_id			designated_root;
 	bridge_id			designated_bridge;
 	u32				path_cost;
 	u32				designated_cost;
 	unsigned long			designated_age;

 	struct timer_list		forward_delay_timer;
 	struct timer_list		hold_timer;
 	struct timer_list		message_age_timer;
 	struct kobject			kobj;
 	struct rcu_head			rcu;

 	unsigned long 			flags;
 #define BR_HAIRPIN_MODE		0x00000001
 #define BR_ISOLATE_MODE		0x00000002

 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 	u32				multicast_startup_queries_sent;
 	unsigned char			multicast_router;
 	struct timer_list		multicast_router_timer;
 	struct timer_list		multicast_query_timer;
 	struct hlist_head		mglist;
 	struct hlist_node		rlist;
 #endif

 #ifdef CONFIG_SYSFS
 	char				sysfs_name[IFNAMSIZ];
 #endif

 #ifdef CONFIG_NET_POLL_CONTROLLER
 	struct netpoll			*np;
 #endif
 };

 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)

 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 {
 	return rcu_dereference(dev->rx_handler_data);
 }

 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
 {
 	return br_port_exists(dev) ?
 		rtnl_dereference(dev->rx_handler_data) : NULL;
 }

 struct br_cpu_netstats {
 	u64			rx_packets;
 	u64			rx_bytes;
 	u64			tx_packets;
 	u64			tx_bytes;
 	struct u64_stats_sync	syncp;
 };

 struct net_bridge
 {
 	spinlock_t			lock;
 	struct list_head		port_list;
 	struct net_device		*dev;

 	struct br_cpu_netstats __percpu *stats;
 	spinlock_t			hash_lock;
 	struct hlist_head		hash[BR_HASH_SIZE];
 #ifdef CONFIG_BRIDGE_NETFILTER
 	struct rtable 			fake_rtable;
 	bool				nf_call_iptables;
 	bool				nf_call_ip6tables;
 	bool				nf_call_arptables;
 #endif
 	unsigned long			flags;
 #define BR_SET_MAC_ADDR		0x00000001

 	u16				group_fwd_mask;

 	/* STP */
 	bridge_id			designated_root;
 	bridge_id			bridge_id;
 	u32				root_path_cost;
 	unsigned long			max_age;
 	unsigned long			hello_time;
 	unsigned long			forward_delay;
 	unsigned long			bridge_max_age;
 	unsigned long			ageing_time;
 	unsigned long			bridge_hello_time;
 	unsigned long			bridge_forward_delay;

 	u8				group_addr[ETH_ALEN];
 	u16				root_port;

 	enum {
 		BR_NO_STP, 		/* no spanning tree */
 		BR_KERNEL_STP,		/* old STP in kernel */
 		BR_USER_STP,		/* new RSTP in userspace */
 	} stp_enabled;

 	unsigned char			topology_change;
 	unsigned char			topology_change_detected;

 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 	unsigned char			multicast_router;

 	u8				multicast_disabled:1;

 	u32				hash_elasticity;
 	u32				hash_max;

 	u32				multicast_last_member_count;
 	u32				multicast_startup_queries_sent;
 	u32				multicast_startup_query_count;

 	unsigned long			multicast_last_member_interval;
 	unsigned long			multicast_membership_interval;
 	unsigned long			multicast_querier_interval;
 	unsigned long			multicast_query_interval;
 	unsigned long			multicast_query_response_interval;
 	unsigned long			multicast_startup_query_interval;

 	spinlock_t			multicast_lock;
 	struct net_bridge_mdb_htable __rcu *mdb;
 	struct hlist_head		router_list;

 	struct timer_list		multicast_router_timer;
 	struct timer_list		multicast_querier_timer;
 	struct timer_list		multicast_query_timer;
 #endif

 	struct timer_list		hello_timer;
 	struct timer_list		tcn_timer;
 	struct timer_list		topology_change_timer;
 	struct timer_list		gc_timer;
 	struct kobject			*ifobj;
 };

 struct br_input_skb_cb {
 	struct net_device *brdev;
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 	int igmp;
 	int mrouters_only;
 #endif
 };

 #define BR_INPUT_SKB_CB(__skb)	((struct br_input_skb_cb *)(__skb)->cb)

 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)	(BR_INPUT_SKB_CB(__skb)->mrouters_only)
 #else
 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)	(0)
 #endif

 #define br_printk(level, br, format, args...)	\
 	printk(level "%s: " format, (br)->dev->name, ##args)

 #define br_err(__br, format, args...)			\
 	br_printk(KERN_ERR, __br, format, ##args)
 #define br_warn(__br, format, args...)			\
 	br_printk(KERN_WARNING, __br, format, ##args)
 #define br_notice(__br, format, args...)		\
 	br_printk(KERN_NOTICE, __br, format, ##args)
 #define br_info(__br, format, args...)			\
 	br_printk(KERN_INFO, __br, format, ##args)

 #define br_debug(br, format, args...)			\
 	pr_debug("%s: " format,  (br)->dev->name, ##args)

 extern struct notifier_block br_device_notifier;
 extern const u8 br_group_address[ETH_ALEN];

 /* called under bridge lock */
 static inline int br_is_root_bridge(const struct net_bridge *br)
 {
 	return !memcmp(&br->bridge_id, &br->designated_root, 8);
 }

 /* br_device.c */
 extern void br_dev_setup(struct net_device *dev);
 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 			       struct net_device *dev);
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 {
 	return br->dev->npinfo;
 }

 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 				       struct sk_buff *skb)
 {
 	struct netpoll *np = p->np;

 	if (np)
 		netpoll_send_skb(np, skb);
 }

 extern int br_netpoll_enable(struct net_bridge_port *p);
 extern void br_netpoll_disable(struct net_bridge_port *p);
 #else
 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 {
 	return NULL;
 }

 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 				       struct sk_buff *skb)
 {
 }

 static inline int br_netpoll_enable(struct net_bridge_port *p)
 {
 	return 0;
 }

 static inline void br_netpoll_disable(struct net_bridge_port *p)
 {
 }
 #endif

 /* br_fdb.c */
 extern int br_fdb_init(void);
 extern void br_fdb_fini(void);
 extern void br_fdb_flush(struct net_bridge *br);
 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 			      const unsigned char *newaddr);
 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 extern void br_fdb_cleanup(unsigned long arg);
 extern void br_fdb_delete_by_port(struct net_bridge *br,
 				  const struct net_bridge_port *p, int do_all);
 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 						 const unsigned char *addr);
 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 			  unsigned long count, unsigned long off);
 extern int br_fdb_insert(struct net_bridge *br,
 			 struct net_bridge_port *source,
 			 const unsigned char *addr);
 extern void br_fdb_update(struct net_bridge *br,
 			  struct net_bridge_port *source,
 			  const unsigned char *addr);
 extern int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb);
 extern int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
 extern int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);

 /* br_forward.c */
 extern void br_deliver(const struct net_bridge_port *to,
 		struct sk_buff *skb);
 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 extern void br_forward(const struct net_bridge_port *to,
 		struct sk_buff *skb, struct sk_buff *skb0);
 extern int br_forward_finish(struct sk_buff *skb);
 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 			     struct sk_buff *skb2);

 /* br_if.c */
 extern void br_port_carrier_check(struct net_bridge_port *p);
 extern int br_add_bridge(struct net *net, const char *name);
 extern int br_del_bridge(struct net *net, const char *name);
 extern void br_net_exit(struct net *net);
 extern int br_add_if(struct net_bridge *br,
 	      struct net_device *dev);
 extern int br_del_if(struct net_bridge *br,
 	      struct net_device *dev);
 extern int br_min_mtu(const struct net_bridge *br);
 extern netdev_features_t br_features_recompute(struct net_bridge *br,
 	netdev_features_t features);

 /* br_input.c */
 extern int br_handle_frame_finish(struct sk_buff *skb);
 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);

 /* br_ioctl.c */
 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);

 /* br_multicast.c */
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 extern int br_multicast_rcv(struct net_bridge *br,
 			    struct net_bridge_port *port,
 			    struct sk_buff *skb);
 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 					       struct sk_buff *skb);
 extern void br_multicast_add_port(struct net_bridge_port *port);
 extern void br_multicast_del_port(struct net_bridge_port *port);
 extern void br_multicast_enable_port(struct net_bridge_port *port);
 extern void br_multicast_disable_port(struct net_bridge_port *port);
 extern void br_multicast_init(struct net_bridge *br);
 extern void br_multicast_open(struct net_bridge *br);
 extern void br_multicast_stop(struct net_bridge *br);
 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 				 struct sk_buff *skb);
 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 				 struct sk_buff *skb, struct sk_buff *skb2);
 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 					unsigned long val);
 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);

 static inline bool br_multicast_is_router(struct net_bridge *br)
 {
 	return br->multicast_router == 2 ||
 	       (br->multicast_router == 1 &&
 		timer_pending(&br->multicast_router_timer));
 }
 #else
 static inline int br_multicast_rcv(struct net_bridge *br,
 				   struct net_bridge_port *port,
 				   struct sk_buff *skb)
 {
 	return 0;
 }

 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 						      struct sk_buff *skb)
 {
 	return NULL;
 }

 static inline void br_multicast_add_port(struct net_bridge_port *port)
 {
 }

 static inline void br_multicast_del_port(struct net_bridge_port *port)
 {
 }

 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 {
 }

 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 {
 }

 static inline void br_multicast_init(struct net_bridge *br)
 {
 }

 static inline void br_multicast_open(struct net_bridge *br)
 {
 }

 static inline void br_multicast_stop(struct net_bridge *br)
 {
 }

 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 					struct sk_buff *skb)
 {
 }

 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 					struct sk_buff *skb,
 					struct sk_buff *skb2)
 {
 }
 static inline bool br_multicast_is_router(struct net_bridge *br)
 {
 	return 0;
 }
 #endif

 /* br_netfilter.c */
 #ifdef CONFIG_BRIDGE_NETFILTER
 extern int br_netfilter_init(void);
 extern void br_netfilter_fini(void);
 extern void br_netfilter_rtable_init(struct net_bridge *);
 #else
 #define br_netfilter_init()	(0)
 #define br_netfilter_fini()	do { } while(0)
 #define br_netfilter_rtable_init(x)
 #endif

 /* br_stp.c */
 extern void br_log_state(const struct net_bridge_port *p);
 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 					   u16 port_no);
 extern void br_init_port(struct net_bridge_port *p);
 extern void br_become_designated_port(struct net_bridge_port *p);

 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 extern int br_set_max_age(struct net_bridge *br, unsigned long x);


 /* br_stp_if.c */
 extern void br_stp_enable_bridge(struct net_bridge *br);
 extern void br_stp_disable_bridge(struct net_bridge *br);
 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 extern void br_stp_enable_port(struct net_bridge_port *p);
 extern void br_stp_disable_port(struct net_bridge_port *p);
 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 				       u16 newprio);
 extern int br_stp_set_port_priority(struct net_bridge_port *p,
 				    unsigned long newprio);
 extern int br_stp_set_path_cost(struct net_bridge_port *p,
 				unsigned long path_cost);
 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);

 /* br_stp_bpdu.c */
 struct stp_proto;
 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 		       struct net_device *dev);

 /* br_stp_timer.c */
 extern void br_stp_timer_init(struct net_bridge *br);
 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 extern unsigned long br_timer_value(const struct timer_list *timer);

 /* br.c */
 #if IS_ENABLED(CONFIG_ATM_LANE)
 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 #endif

 /* br_netlink.c */
 extern int br_netlink_init(void);
 extern void br_netlink_fini(void);
 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);

 #ifdef CONFIG_SYSFS
 /* br_sysfs_if.c */
 extern const struct sysfs_ops brport_sysfs_ops;
 extern int br_sysfs_addif(struct net_bridge_port *p);
 extern int br_sysfs_renameif(struct net_bridge_port *p);

 /* br_sysfs_br.c */
 extern int br_sysfs_addbr(struct net_device *dev);
 extern void br_sysfs_delbr(struct net_device *dev);

 #else

 #define br_sysfs_addif(p)	(0)
 #define br_sysfs_renameif(p)	(0)
 #define br_sysfs_addbr(dev)	(0)
 #define br_sysfs_delbr(dev)	do { } while(0)
 #endif /* CONFIG_SYSFS */

 #define __br_get( __hook, __default, __args ... ) \
 		(__hook ? (__hook( __args )) : (__default))

 static inline void __br_notify(int group, int type, const void *data)
 {
 	br_notify_hook_t *notify_hook = rcu_dereference(br_notify_hook);

 	if (notify_hook)
 		notify_hook(group, type, data);
 }

 #endif
	/*
	* 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 _BR_PRIVATE_H
	#define _BR_PRIVATE_H

	#include <linux/netdevice.h>
	#include <linux/if_bridge.h>
	#include <linux/netpoll.h>
	#include <linux/u64_stats_sync.h>
	#include <net/route.h>
	#include <linux/export.h>

	#define BR_HASH_BITS 8
	#define BR_HASH_SIZE (1 << BR_HASH_BITS)

	#define BR_HOLD_TIME (1*HZ)

	#define BR_PORT_BITS 10
	#define BR_MAX_PORTS (1<<BR_PORT_BITS)

	#define BR_VERSION "2.3"

	/* Control of forwarding link local multicast */
	#define BR_GROUPFWD_DEFAULT 0
	/* Don't allow forwarding control protocols like STP and LLDP */
	#define BR_GROUPFWD_RESTRICTED 0x4007u

	/* Path to usermode spanning tree program */
	#define BR_STP_PROG "/sbin/bridge-stp"

	typedef struct bridge_id bridge_id;
	typedef struct mac_addr mac_addr;
	typedef __u16 port_id;

	struct bridge_id
	{
	unsigned char prio[2];
	unsigned char addr[6];
	};

	struct mac_addr
	{
	unsigned char addr[6];
	};

	struct br_ip
	{
	union {
	__be32 ip4;
	#if IS_ENABLED(CONFIG_IPV6)
	struct in6_addr ip6;
	#endif
	} u;
	__be16 proto;
	};

	struct net_bridge_fdb_entry
	{
	struct hlist_node hlist;
	struct net_bridge_port *dst;

	struct rcu_head rcu;
	unsigned long updated;
	unsigned long used;
	mac_addr addr;
	unsigned char is_local;
	unsigned char is_static;
	};

	struct net_bridge_port_group {
	struct net_bridge_port *port;
	struct net_bridge_port_group __rcu *next;
	struct hlist_node mglist;
	struct rcu_head rcu;
	struct timer_list timer;
	struct br_ip addr;
	};

	struct net_bridge_mdb_entry
	{
	struct hlist_node hlist[2];
	struct net_bridge *br;
	struct net_bridge_port_group __rcu *ports;
	struct rcu_head rcu;
	struct timer_list timer;
	struct br_ip addr;
	bool mglist;
	};

	struct net_bridge_mdb_htable
	{
	struct hlist_head *mhash;
	struct rcu_head rcu;
	struct net_bridge_mdb_htable *old;
	u32 size;
	u32 max;
	u32 secret;
	u32 ver;
	};

	struct net_bridge_port
	{
	struct net_bridge *br;
	struct net_device *dev;
	struct list_head list;

	/* STP */
	u8 priority;
	u8 state;
	u16 port_no;
	unsigned char topology_change_ack;
	unsigned char config_pending;
	port_id port_id;
	port_id designated_port;
	bridge_id designated_root;
	bridge_id designated_bridge;
	u32 path_cost;
	u32 designated_cost;
	unsigned long designated_age;

	struct timer_list forward_delay_timer;
	struct timer_list hold_timer;
	struct timer_list message_age_timer;
	struct kobject kobj;
	struct rcu_head rcu;

	unsigned long flags;
	#define BR_HAIRPIN_MODE 0x00000001
	#define BR_ISOLATE_MODE 0x00000002

	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	u32 multicast_startup_queries_sent;
	unsigned char multicast_router;
	struct timer_list multicast_router_timer;
	struct timer_list multicast_query_timer;
	struct hlist_head mglist;
	struct hlist_node rlist;
	#endif

	#ifdef CONFIG_SYSFS
	char sysfs_name[IFNAMSIZ];
	#endif

	#ifdef CONFIG_NET_POLL_CONTROLLER
	struct netpoll *np;
	#endif
	};

	#define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)

	static inline struct net_bridge_port br_port_get_rcu(const struct net_device dev)
	{
	return rcu_dereference(dev->rx_handler_data);
	}

	static inline struct net_bridge_port br_port_get_rtnl(struct net_device dev)
	{
	return br_port_exists(dev) ?
	rtnl_dereference(dev->rx_handler_data) : NULL;
	}

	struct br_cpu_netstats {
	u64 rx_packets;
	u64 rx_bytes;
	u64 tx_packets;
	u64 tx_bytes;
	struct u64_stats_sync syncp;
	};

	struct net_bridge
	{
	spinlock_t lock;
	struct list_head port_list;
	struct net_device *dev;

	struct br_cpu_netstats __percpu *stats;
	spinlock_t hash_lock;
	struct hlist_head hash[BR_HASH_SIZE];
	#ifdef CONFIG_BRIDGE_NETFILTER
	struct rtable fake_rtable;
	bool nf_call_iptables;
	bool nf_call_ip6tables;
	bool nf_call_arptables;
	#endif
	unsigned long flags;
	#define BR_SET_MAC_ADDR 0x00000001

	u16 group_fwd_mask;

	/* STP */
	bridge_id designated_root;
	bridge_id bridge_id;
	u32 root_path_cost;
	unsigned long max_age;
	unsigned long hello_time;
	unsigned long forward_delay;
	unsigned long bridge_max_age;
	unsigned long ageing_time;
	unsigned long bridge_hello_time;
	unsigned long bridge_forward_delay;

	u8 group_addr[ETH_ALEN];
	u16 root_port;

	enum {
	BR_NO_STP, /* no spanning tree */
	BR_KERNEL_STP, /* old STP in kernel */
	BR_USER_STP, /* new RSTP in userspace */
	} stp_enabled;

	unsigned char topology_change;
	unsigned char topology_change_detected;

	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	unsigned char multicast_router;

	u8 multicast_disabled:1;

	u32 hash_elasticity;
	u32 hash_max;

	u32 multicast_last_member_count;
	u32 multicast_startup_queries_sent;
	u32 multicast_startup_query_count;

	unsigned long multicast_last_member_interval;
	unsigned long multicast_membership_interval;
	unsigned long multicast_querier_interval;
	unsigned long multicast_query_interval;
	unsigned long multicast_query_response_interval;
	unsigned long multicast_startup_query_interval;

	spinlock_t multicast_lock;
	struct net_bridge_mdb_htable __rcu *mdb;
	struct hlist_head router_list;

	struct timer_list multicast_router_timer;
	struct timer_list multicast_querier_timer;
	struct timer_list multicast_query_timer;
	#endif

	struct timer_list hello_timer;
	struct timer_list tcn_timer;
	struct timer_list topology_change_timer;
	struct timer_list gc_timer;
	struct kobject *ifobj;
	};

	struct br_input_skb_cb {
	struct net_device *brdev;
	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	int igmp;
	int mrouters_only;
	#endif
	};

	#define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)

	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
	#else
	# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
	#endif

	#define br_printk(level, br, format, args...) \
	printk(level "%s: " format, (br)->dev->name, ##args)

	#define br_err(__br, format, args...) \
	br_printk(KERN_ERR, __br, format, ##args)
	#define br_warn(__br, format, args...) \
	br_printk(KERN_WARNING, __br, format, ##args)
	#define br_notice(__br, format, args...) \
	br_printk(KERN_NOTICE, __br, format, ##args)
	#define br_info(__br, format, args...) \
	br_printk(KERN_INFO, __br, format, ##args)

	#define br_debug(br, format, args...) \
	pr_debug("%s: " format, (br)->dev->name, ##args)

	extern struct notifier_block br_device_notifier;
	extern const u8 br_group_address[ETH_ALEN];

	/* called under bridge lock */
	static inline int br_is_root_bridge(const struct net_bridge *br)
	{
	return !memcmp(&br->bridge_id, &br->designated_root, 8);
	}

	/* br_device.c */
	extern void br_dev_setup(struct net_device *dev);
	extern void br_dev_delete(struct net_device dev, struct list_head list);
	extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
	struct net_device *dev);
	#ifdef CONFIG_NET_POLL_CONTROLLER
	static inline struct netpoll_info br_netpoll_info(struct net_bridge br)
	{
	return br->dev->npinfo;
	}

	static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
	struct sk_buff *skb)
	{
	struct netpoll *np = p->np;

	if (np)
	netpoll_send_skb(np, skb);
	}

	extern int br_netpoll_enable(struct net_bridge_port *p);
	extern void br_netpoll_disable(struct net_bridge_port *p);
	#else
	static inline struct netpoll_info br_netpoll_info(struct net_bridge br)
	{
	return NULL;
	}

	static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
	struct sk_buff *skb)
	{
	}

	static inline int br_netpoll_enable(struct net_bridge_port *p)
	{
	return 0;
	}

	static inline void br_netpoll_disable(struct net_bridge_port *p)
	{
	}
	#endif

	/* br_fdb.c */
	extern int br_fdb_init(void);
	extern void br_fdb_fini(void);
	extern void br_fdb_flush(struct net_bridge *br);
	extern void br_fdb_changeaddr(struct net_bridge_port *p,
	const unsigned char *newaddr);
	extern void br_fdb_change_mac_address(struct net_bridge br, const u8 newaddr);
	extern void br_fdb_cleanup(unsigned long arg);
	extern void br_fdb_delete_by_port(struct net_bridge *br,
	const struct net_bridge_port *p, int do_all);
	extern struct net_bridge_fdb_entry __br_fdb_get(struct net_bridge br,
	const unsigned char *addr);
	extern int br_fdb_test_addr(struct net_device dev, unsigned char addr);
	extern int br_fdb_fillbuf(struct net_bridge br, void buf,
	unsigned long count, unsigned long off);
	extern int br_fdb_insert(struct net_bridge *br,
	struct net_bridge_port *source,
	const unsigned char *addr);
	extern void br_fdb_update(struct net_bridge *br,
	struct net_bridge_port *source,
	const unsigned char *addr);
	extern int br_fdb_dump(struct sk_buff skb, struct netlink_callback cb);
	extern int br_fdb_add(struct sk_buff skb, struct nlmsghdr nlh, void *arg);
	extern int br_fdb_delete(struct sk_buff skb, struct nlmsghdr nlh, void *arg);

	/* br_forward.c */
	extern void br_deliver(const struct net_bridge_port *to,
	struct sk_buff *skb);
	extern int br_dev_queue_push_xmit(struct sk_buff *skb);
	extern void br_forward(const struct net_bridge_port *to,
	struct sk_buff skb, struct sk_buff skb0);
	extern int br_forward_finish(struct sk_buff *skb);
	extern void br_flood_deliver(struct net_bridge br, struct sk_buff skb);
	extern void br_flood_forward(struct net_bridge br, struct sk_buff skb,
	struct sk_buff *skb2);

	/* br_if.c */
	extern void br_port_carrier_check(struct net_bridge_port *p);
	extern int br_add_bridge(struct net net, const char name);
	extern int br_del_bridge(struct net net, const char name);
	extern void br_net_exit(struct net *net);
	extern int br_add_if(struct net_bridge *br,
	struct net_device *dev);
	extern int br_del_if(struct net_bridge *br,
	struct net_device *dev);
	extern int br_min_mtu(const struct net_bridge *br);
	extern netdev_features_t br_features_recompute(struct net_bridge *br,
	netdev_features_t features);

	/* br_input.c */
	extern int br_handle_frame_finish(struct sk_buff *skb);
	extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);

	/* br_ioctl.c */
	extern int br_dev_ioctl(struct net_device dev, struct ifreq rq, int cmd);
	extern int br_ioctl_deviceless_stub(struct net net, unsigned int cmd, void __user arg);

	/* br_multicast.c */
	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	extern int br_multicast_rcv(struct net_bridge *br,
	struct net_bridge_port *port,
	struct sk_buff *skb);
	extern struct net_bridge_mdb_entry br_mdb_get(struct net_bridge br,
	struct sk_buff *skb);
	extern void br_multicast_add_port(struct net_bridge_port *port);
	extern void br_multicast_del_port(struct net_bridge_port *port);
	extern void br_multicast_enable_port(struct net_bridge_port *port);
	extern void br_multicast_disable_port(struct net_bridge_port *port);
	extern void br_multicast_init(struct net_bridge *br);
	extern void br_multicast_open(struct net_bridge *br);
	extern void br_multicast_stop(struct net_bridge *br);
	extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
	struct sk_buff *skb);
	extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
	struct sk_buff skb, struct sk_buff skb2);
	extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
	extern int br_multicast_set_port_router(struct net_bridge_port *p,
	unsigned long val);
	extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
	extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);

	static inline bool br_multicast_is_router(struct net_bridge *br)
	{
	return br->multicast_router == 2 \|\|
	(br->multicast_router == 1 &&
	timer_pending(&br->multicast_router_timer));
	}
	#else
	static inline int br_multicast_rcv(struct net_bridge *br,
	struct net_bridge_port *port,
	struct sk_buff *skb)
	{
	return 0;
	}

	static inline struct net_bridge_mdb_entry br_mdb_get(struct net_bridge br,
	struct sk_buff *skb)
	{
	return NULL;
	}

	static inline void br_multicast_add_port(struct net_bridge_port *port)
	{
	}

	static inline void br_multicast_del_port(struct net_bridge_port *port)
	{
	}

	static inline void br_multicast_enable_port(struct net_bridge_port *port)
	{
	}

	static inline void br_multicast_disable_port(struct net_bridge_port *port)
	{
	}

	static inline void br_multicast_init(struct net_bridge *br)
	{
	}

	static inline void br_multicast_open(struct net_bridge *br)
	{
	}

	static inline void br_multicast_stop(struct net_bridge *br)
	{
	}

	static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
	struct sk_buff *skb)
	{
	}

	static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
	struct sk_buff *skb,
	struct sk_buff *skb2)
	{
	}
	static inline bool br_multicast_is_router(struct net_bridge *br)
	{
	return 0;
	}
	#endif

	/* br_netfilter.c */
	#ifdef CONFIG_BRIDGE_NETFILTER
	extern int br_netfilter_init(void);
	extern void br_netfilter_fini(void);
	extern void br_netfilter_rtable_init(struct net_bridge *);
	#else
	#define br_netfilter_init() (0)
	#define br_netfilter_fini() do { } while(0)
	#define br_netfilter_rtable_init(x)
	#endif

	/* br_stp.c */
	extern void br_log_state(const struct net_bridge_port *p);
	extern struct net_bridge_port br_get_port(struct net_bridge br,
	u16 port_no);
	extern void br_init_port(struct net_bridge_port *p);
	extern void br_become_designated_port(struct net_bridge_port *p);

	extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
	extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
	extern int br_set_max_age(struct net_bridge *br, unsigned long x);


	/* br_stp_if.c */
	extern void br_stp_enable_bridge(struct net_bridge *br);
	extern void br_stp_disable_bridge(struct net_bridge *br);
	extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
	extern void br_stp_enable_port(struct net_bridge_port *p);
	extern void br_stp_disable_port(struct net_bridge_port *p);
	extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
	extern void br_stp_change_bridge_id(struct net_bridge br, const unsigned char a);
	extern void br_stp_set_bridge_priority(struct net_bridge *br,
	u16 newprio);
	extern int br_stp_set_port_priority(struct net_bridge_port *p,
	unsigned long newprio);
	extern int br_stp_set_path_cost(struct net_bridge_port *p,
	unsigned long path_cost);
	extern ssize_t br_show_bridge_id(char buf, const struct bridge_id id);

	/* br_stp_bpdu.c */
	struct stp_proto;
	extern void br_stp_rcv(const struct stp_proto proto, struct sk_buff skb,
	struct net_device *dev);

	/* br_stp_timer.c */
	extern void br_stp_timer_init(struct net_bridge *br);
	extern void br_stp_port_timer_init(struct net_bridge_port *p);
	extern unsigned long br_timer_value(const struct timer_list *timer);

	/* br.c */
	#if IS_ENABLED(CONFIG_ATM_LANE)
	extern int (br_fdb_test_addr_hook)(struct net_device dev, unsigned char *addr);
	#endif

	/* br_netlink.c */
	extern int br_netlink_init(void);
	extern void br_netlink_fini(void);
	extern void br_ifinfo_notify(int event, struct net_bridge_port *port);

	#ifdef CONFIG_SYSFS
	/* br_sysfs_if.c */
	extern const struct sysfs_ops brport_sysfs_ops;
	extern int br_sysfs_addif(struct net_bridge_port *p);
	extern int br_sysfs_renameif(struct net_bridge_port *p);

	/* br_sysfs_br.c */
	extern int br_sysfs_addbr(struct net_device *dev);
	extern void br_sysfs_delbr(struct net_device *dev);

	#else

	#define br_sysfs_addif(p) (0)
	#define br_sysfs_renameif(p) (0)
	#define br_sysfs_addbr(dev) (0)
	#define br_sysfs_delbr(dev) do { } while(0)
	#endif /* CONFIG_SYSFS */

	#define __br_get( __hook, __default, __args ... ) \
	(__hook ? (__hook( __args )) : (__default))

	static inline void __br_notify(int group, int type, const void *data)
	{
	br_notify_hook_t *notify_hook = rcu_dereference(br_notify_hook);

	if (notify_hook)
	notify_hook(group, type, data);
	}

	#endif