/*
   *	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/if_vlan.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_VLAN_BITMAP_LEN	BITS_TO_LONGS(VLAN_N_VID)

  #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;

  	__u16		vid;

  };

  struct net_port_vlans {
  	u16				port_idx;

  	u16				pvid;

  	union {
  		struct net_bridge_port		*port;
  		struct net_bridge		*br;
  	}				parent;
  	struct rcu_head			rcu;
  	unsigned long			vlan_bitmap[BR_VLAN_BITMAP_LEN];

  	unsigned long			untagged_bitmap[BR_VLAN_BITMAP_LEN];

  	u16				num_vlans;

  };

  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;

  	__u16				vlan_id;

  };

  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;

  	unsigned char			state;

  };
  
  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_BPDU_GUARD           0x00000002

  #define BR_ROOT_BLOCK		0x00000004

  #define BR_MULTICAST_FAST_LEAVE	0x00000008

  #define BR_ADMIN_COST		0x00000010

  
  #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

  #ifdef CONFIG_BRIDGE_VLAN_FILTERING
  	struct net_port_vlans __rcu	*vlan_info;
  #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(const 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

  	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;

  	u8				multicast_querier: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;

  #ifdef CONFIG_BRIDGE_VLAN_FILTERING
  	u8				vlan_enabled;
  	struct net_port_vlans __rcu	*vlan_info;
  #endif

  };

  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;

  
  /* 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, gfp_t gfp);

  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, gfp_t gfp)

  {
  	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,
  						 __u16 vid);

  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,
  			 u16 vid);

  extern void br_fdb_update(struct net_bridge *br,
  			  struct net_bridge_port *source,

  			  const unsigned char *addr,
  			  u16 vid);

  extern int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vid);

  extern int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],

  			 struct net_device *dev,

  			 const unsigned char *addr);

  extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],

  		      struct net_device *dev,

  		      const unsigned char *addr,

  		      u16 nlh_flags);
  extern int br_fdb_dump(struct sk_buff *skb,
  		       struct netlink_callback *cb,
  		       struct net_device *dev,
  		       int idx);

  
  /* 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 unsigned int br_mdb_rehash_seq;

  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, u16 vid);

  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_querier(struct net_bridge *br, unsigned long val);

  extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);

  extern struct net_bridge_mdb_entry *br_mdb_ip_get(
  				struct net_bridge_mdb_htable *mdb,
  				struct br_ip *dst);
  extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
  				struct net_bridge_port *port, struct br_ip *group);
  extern void br_multicast_free_pg(struct rcu_head *head);
  extern struct net_bridge_port_group *br_multicast_new_port_group(
  				struct net_bridge_port *port,
  				struct br_ip *group,

  				struct net_bridge_port_group *next,
  				unsigned char state);

  extern void br_mdb_init(void);

  extern void br_mdb_uninit(void);

  extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
  			  struct br_ip *group, int type);

  #define mlock_dereference(X, br) \
  	rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
  
  #if IS_ENABLED(CONFIG_IPV6)
  #include <net/addrconf.h>
  static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
  {
  	if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
  		return 1;
  	return 0;
  }
  #endif

  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, u16 vid)

  {
  	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;

  }

  static inline void br_mdb_init(void)
  {
  }
  static inline void br_mdb_uninit(void)
  {
  }

  #endif

  /* br_vlan.c */
  #ifdef CONFIG_BRIDGE_VLAN_FILTERING

  extern bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,

  			       struct sk_buff *skb, u16 *vid);

  extern bool br_allowed_egress(struct net_bridge *br,
  			      const struct net_port_vlans *v,
  			      const struct sk_buff *skb);

  extern struct sk_buff *br_handle_vlan(struct net_bridge *br,
  				      const struct net_port_vlans *v,
  				      struct sk_buff *skb);

  extern int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);

  extern int br_vlan_delete(struct net_bridge *br, u16 vid);
  extern void br_vlan_flush(struct net_bridge *br);
  extern int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);

  extern int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);

  extern int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
  extern void nbp_vlan_flush(struct net_bridge_port *port);

  extern bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);

  
  static inline struct net_port_vlans *br_get_vlan_info(
  						const struct net_bridge *br)
  {

  	return rcu_dereference_rtnl(br->vlan_info);

  }
  
  static inline struct net_port_vlans *nbp_get_vlan_info(
  						const struct net_bridge_port *p)
  {

  	return rcu_dereference_rtnl(p->vlan_info);

  }
  
  /* Since bridge now depends on 8021Q module, but the time bridge sees the
   * skb, the vlan tag will always be present if the frame was tagged.
   */
  static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
  {
  	int err = 0;
  
  	if (vlan_tx_tag_present(skb))
  		*vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
  	else {
  		*vid = 0;
  		err = -EINVAL;
  	}
  
  	return err;
  }

  
  static inline u16 br_get_pvid(const struct net_port_vlans *v)
  {
  	/* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
  	 * vid wasn't set
  	 */
  	smp_rmb();
  	return (v->pvid & VLAN_TAG_PRESENT) ?
  			(v->pvid & ~VLAN_TAG_PRESENT) :
  			VLAN_N_VID;
  }

  #else

  static inline bool br_allowed_ingress(struct net_bridge *br,
  				      struct net_port_vlans *v,

  				      struct sk_buff *skb,
  				      u16 *vid)

  {
  	return true;
  }

  static inline bool br_allowed_egress(struct net_bridge *br,
  				     const struct net_port_vlans *v,
  				     const struct sk_buff *skb)
  {
  	return true;
  }

  static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
  					     const struct net_port_vlans *v,
  					     struct sk_buff *skb)
  {
  	return skb;
  }

  static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)

  {
  	return -EOPNOTSUPP;
  }
  
  static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
  {
  	return -EOPNOTSUPP;
  }
  
  static inline void br_vlan_flush(struct net_bridge *br)
  {
  }

  static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)

  {
  	return -EOPNOTSUPP;
  }
  
  static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
  {
  	return -EOPNOTSUPP;
  }
  
  static inline void nbp_vlan_flush(struct net_bridge_port *port)
  {
  }

  static inline struct net_port_vlans *br_get_vlan_info(
  						const struct net_bridge *br)
  {
  	return NULL;
  }
  static inline struct net_port_vlans *nbp_get_vlan_info(
  						const struct net_bridge_port *p)
  {
  	return NULL;
  }

  static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
  {
  	return false;
  }

  static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)

  {
  	return 0;
  }

  static inline u16 br_get_pvid(const struct net_port_vlans *v)
  {
  	return VLAN_N_VID;	/* Returns invalid vid */
  }

  #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 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);

  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 struct rtnl_link_ops br_link_ops;

  extern int br_netlink_init(void);

  extern void br_netlink_fini(void);
  extern void br_ifinfo_notify(int event, struct net_bridge_port *port);

  extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);

  extern int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);

  extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,

  		      struct net_device *dev, u32 filter_mask);

  #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

  static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
  static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
  static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
  static inline void br_sysfs_delbr(struct net_device *dev) { return; }

  #endif /* CONFIG_SYSFS */
  
  #endif