/*
 *	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 <net/ip6_fib.h>
#include <linux/if_vlan.h>
#include <linux/rhashtable.h>
#include "br_public.h"

#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 of control protocols like STP, MAC PAUSE and LACP */
#define BR_GROUPFWD_RESTRICTED	0x0007u
/* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
#define BR_GROUPFWD_8021AD	0xB801u

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

#define BR_AGE_MAX_SEC (60 * 60 * 2)
#define BR_AGE_MIN_SEC (30 * 60)

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

/**
 * struct net_bridge_vlan - per-vlan entry
 *
 * @vnode: rhashtable member
 * @vid: VLAN id
 * @flags: bridge vlan flags
 * @stats: per-cpu VLAN statistics
 * @br: if MASTER flag set, this points to a bridge struct
 * @port: if MASTER flag unset, this points to a port struct
 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 *          for this VLAN entry
 * @vlist: sorted list of VLAN entries
 * @rcu: used for entry destruction
 *
 * This structure is shared between the global per-VLAN entries contained in
 * the bridge rhashtable and the local per-port per-VLAN entries contained in
 * the port's rhashtable. The union entries should be interpreted depending on
 * the entry flags that are set.
 */
struct net_bridge_vlan {
	struct rhash_head		vnode;
	u16				vid;
	u16				flags;
	struct br_vlan_stats __percpu	*stats;
	union {
		struct net_bridge	*br;
		struct net_bridge_port	*port;
	};
	union {
		atomic_t		refcnt;
		struct net_bridge_vlan	*brvlan;
	};
	struct list_head		vlist;

	struct rcu_head			rcu;
};

/**
 * struct net_bridge_vlan_group
 *
 * @vlan_hash: VLAN entry rhashtable
 * @vlan_list: sorted VLAN entry list
 * @num_vlans: number of total VLAN entries
 * @pvid: PVID VLAN id
 *
 * IMPORTANT: Be careful when checking if there're VLAN entries using list
 *            primitives because the bridge can have entries in its list which
 *            are just for global context but not for filtering, i.e. they have
 *            the master flag set but not the brentry flag. If you have to check
 *            if there're "real" entries in the bridge please test @num_vlans
 */
struct net_bridge_vlan_group {
	struct rhashtable		vlan_hash;
	struct list_head		vlan_list;
	u16				num_vlans;
	u16				pvid;
};

enum
{
	MCAST_FWD_BLOCK = 0,
	MCAST_FWD_ALLOW = 1,
};

struct net_bridge_mcast_reqs
{
	mac_addr ucast_req_addr;
	unsigned char forward;
	struct list_head list;
};

struct net_bridge_subport_req {
	uint8_t src_mac[ETH_ALEN];
	struct net_bridge_subport_req *next;
};

#define MDB_PG_FLAGS_PERMANENT	BIT(0)
#define MDB_PG_FLAGS_OFFLOAD	BIT(1)

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			flags;
	u32				sub_port;
	struct {
		struct net_bridge_subport_req   *head;
		unsigned int            count;
	} subport_reqs;
};

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;
	u32                             report_flood_indicator;
	unsigned long                   report_target_jiffies;
	u32                             rx_specific_query;
};

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;
};


#define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
#define br_promisc_port(p) ((p)->flags & BR_PROMISC)

#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_input_skb_cb {
	struct net_device *brdev;

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	int igmp;
	int mrouters_only;
#endif

	int ucast_fwd;
	bool proxyarp_replied;

#ifdef CONFIG_BRIDGE_VLAN_FILTERING
	bool vlan_filtered;
#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)
# define BR_INPUT_SKB_CB_UCAST_FWD(__skb)        (BR_INPUT_SKB_CB(__skb)->ucast_fwd)
#else
# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)	(0)
# define BR_INPUT_SKB_CB_UCAST_FWD(__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)

/* 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);
}

/* check if a VLAN entry is global */
static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
{
	return v->flags & BRIDGE_VLAN_INFO_MASTER;
}

/* check if a VLAN entry is used by the bridge */
static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
{
	return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
}

/* check if we should use the vlan entry, returns false if it's only context */
static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
{
	if (br_vlan_is_master(v)) {
		if (br_vlan_is_brentry(v))
			return true;
		else
			return false;
	}

	return true;
}

/* br_device.c */
void br_dev_setup(struct net_device *dev);
void br_dev_delete(struct net_device *dev, struct list_head *list);
netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
#ifdef CONFIG_NET_POLL_CONTROLLER
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);
}

int br_netpoll_enable(struct net_bridge_port *p);
void br_netpoll_disable(struct net_bridge_port *p);
#else
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 */
int br_fdb_init(void);
void br_fdb_fini(void);
void br_fdb_flush(struct net_bridge *br);
void br_fdb_find_delete_local(struct net_bridge *br,
			      const struct net_bridge_port *p,
			      const unsigned char *addr, u16 vid);
void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
void br_fdb_cleanup(unsigned long arg);
extern void br_handle_fwt_capacity(struct net_bridge *br);
void br_fdb_delete_by_port(struct net_bridge *br,
			   const struct net_bridge_port *p, u16 vid, int do_all);
struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
					  const unsigned char *addr, __u16 vid);
struct net_bridge_fdb_entry *br_fdb_get(struct net_bridge *br,
                                               unsigned char *addr);
struct net_bridge_fdb_entry *br_fdb_get_ext(struct net_bridge *br,
                                                struct sk_buff *skb,
                                               unsigned char *addr);
void br_fdb_put(struct net_bridge_fdb_entry *ent);
int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
unsigned char br_fdb_get_attached(struct net_bridge *br, unsigned char *addr);
unsigned char br_fdb_delete_by_sub_port(struct net_bridge *br,
                                      const struct net_bridge_port *p,
                                      port_id sub_port);
int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
		   unsigned long off);
int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
		  const unsigned char *addr, u16 vid);
extern void br_fdb_update_const(struct net_bridge *br,
			  struct net_bridge_port *source,
			  const unsigned char *addr,
			  u16 vid, bool added_by_user,
			  port_id sub_port);
void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
		const unsigned char *addr, u16 vid, bool added_by_user,
		port_id sub_port);

void br_mcast_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
                   const unsigned char *mcast_addr, const unsigned char *ucast_addr,port_id sub_port,
                   int op_join);

int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
		  struct net_device *dev, const unsigned char *addr, u16 vid);
int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
	       const unsigned char *addr, u16 vid, u16 nlh_flags);
int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
		struct net_device *dev, struct net_device *fdev, int idx);
int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
			      const unsigned char *addr, u16 vid);
int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
			      const unsigned char *addr, u16 vid);

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

/* br_if.c */
void br_port_carrier_check(struct net_bridge_port *p);
int br_add_bridge(struct net *net, const char *name, const uint16_t vlan_id);
int br_del_bridge(struct net *net, const char *name);
int br_add_if(struct net_bridge *br, struct net_device *dev);
int br_del_if(struct net_bridge *br, struct net_device *dev);
int br_min_mtu(const struct net_bridge *br);
netdev_features_t br_features_recompute(struct net_bridge *br,
					netdev_features_t features);
void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
void br_manage_promisc(struct net_bridge *br);

/* br_input.c */
int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
rx_handler_result_t br_handle_frame(struct sk_buff **pskb);

static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
{
	return rcu_dereference(dev->rx_handler) == br_handle_frame;
}

static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
{
	return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
}

/* br_ioctl.c */
int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
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;
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
		     struct sk_buff *skb, u16 vid);
struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
					struct sk_buff *skb, u16 vid);
void br_multicast_add_port(struct net_bridge_port *port);
void br_multicast_del_port(struct net_bridge_port *port);
void br_multicast_enable_port(struct net_bridge_port *port);
void br_multicast_disable_port(struct net_bridge_port *port);
void br_multicast_init(struct net_bridge *br);
void br_multicast_open(struct net_bridge *br);
void br_multicast_stop(struct net_bridge *br);
void br_multicast_dev_del(struct net_bridge *br);
void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
			  struct sk_buff *skb);
void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
			  struct sk_buff *skb, struct sk_buff *skb2);
int br_multicast_set_router(struct net_bridge *br, unsigned long val);
int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
int br_multicast_toggle(struct net_bridge *br, unsigned long val);
int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
struct net_bridge_mdb_entry *
br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
struct net_bridge_mdb_entry *
br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
		       struct br_ip *group);
void br_multicast_free_pg(struct rcu_head *head);
struct net_bridge_port_group *
br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
			    struct net_bridge_port_group __rcu *next,
			    unsigned char flags);
void br_mdb_init(void);
void br_mdb_uninit(void);
void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
		   struct br_ip *group, int type, u8 flags);
void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
		   int type);

#define mlock_dereference(X, br) \
	rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))

void br_mdb_delete_by_sub_port(struct net_bridge *br, const struct net_bridge_port *port,
                   port_id sub_port);

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));
}

static inline void br_reset_sub_port_bitmap(uint32_t *sub_port_map, port_id sub_port)
{
        port_id unmap_sub_port;

        unmap_sub_port = BR_SUBPORT_UNMAP(sub_port);
        sub_port_map[BR_SUBPORT_IDX(unmap_sub_port)] &= ~BR_SUBPORT_BITMAP(unmap_sub_port);
}

extern void br_report_flood(struct net_bridge *br,
                struct net_bridge_mdb_entry *mp, struct sk_buff *skb);
extern struct net_bridge_mdb_entry *br_mdb_get_ext(struct net_bridge *br,
		struct sk_buff *skb, u16 vid);
extern void br_multicast_copy_to_sub_ports(struct net_bridge *br,
		struct net_bridge_mdb_entry *mdst, struct sk_buff *skb);
static inline bool
__br_multicast_querier_exists(struct net_bridge *br,
				struct bridge_mcast_other_query *querier,
				const bool is_ipv6)
{
	bool own_querier_enabled;

	if (br->multicast_querier) {
		if (is_ipv6 && !br->has_ipv6_addr)
			own_querier_enabled = false;
		else
			own_querier_enabled = true;
	} else {
		own_querier_enabled = false;
	}

	return time_is_before_jiffies(querier->delay_time) &&
	       (own_querier_enabled || timer_pending(&querier->timer));
}

static inline bool br_multicast_querier_exists(struct net_bridge *br,
					       struct ethhdr *eth)
{
	switch (eth->h_proto) {
	case (htons(ETH_P_IP)):
		return __br_multicast_querier_exists(br,
			&br->ip4_other_query, false);
#if IS_ENABLED(CONFIG_IPV6)
	case (htons(ETH_P_IPV6)):
		return __br_multicast_querier_exists(br,
			&br->ip6_other_query, true);
#endif
	default:
		return false;
	}
}
#else
static inline int br_multicast_rcv(struct net_bridge *br,
				   struct net_bridge_port *port,
				   struct sk_buff *skb,
				   u16 vid)
{
	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_dev_del(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 void br_report_flood(struct net_bridge *br,
                struct net_bridge_mdb_entry *mp, struct sk_buff *skb)
{
}

static inline bool br_multicast_is_router(struct net_bridge *br)
{
	return 0;
}

static inline void br_reset_sub_port_bitmap(uint32_t *sub_port_map, port_id sub_port)
{
}

static inline struct net_bridge_mdb_entry *br_mdb_get_ext(struct net_bridge *br,
                struct sk_buff *skb, u16 vid)
{
        return NULL;
}

static inline bool br_multicast_querier_exists(struct net_bridge *br,
					       struct ethhdr *eth)
{
	return false;
}
static inline void br_mdb_init(void)
{
}
static inline void br_mdb_uninit(void)
{
}
#endif

/* br_vlan.c */
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
bool br_allowed_ingress(const struct net_bridge *br,
			struct net_bridge_vlan_group *vg, struct sk_buff *skb,
			u16 *vid);
bool br_allowed_egress(struct net_bridge_vlan_group *vg,
		       const struct sk_buff *skb);
bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
struct sk_buff *br_handle_vlan(struct net_bridge *br,
			       struct net_bridge_vlan_group *vg,
			       struct sk_buff *skb);
int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
int br_vlan_delete(struct net_bridge *br, u16 vid);
void br_vlan_flush(struct net_bridge *br);
struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
void br_recalculate_fwd_mask(struct net_bridge *br);
int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
int br_vlan_init(struct net_bridge *br);
int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
void nbp_vlan_flush(struct net_bridge_port *port);
int nbp_vlan_init(struct net_bridge_port *port);
int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
void br_vlan_get_stats(const struct net_bridge_vlan *v,
		       struct br_vlan_stats *stats);

static inline struct net_bridge_vlan_group *br_vlan_group(
					const struct net_bridge *br)
{
	return rtnl_dereference(br->vlgrp);
}

static inline struct net_bridge_vlan_group *nbp_vlan_group(
					const struct net_bridge_port *p)
{
	return rtnl_dereference(p->vlgrp);
}

static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
					const struct net_bridge *br)
{
	return rcu_dereference(br->vlgrp);
}

static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
					const struct net_bridge_port *p)
{
	return rcu_dereference(p->vlgrp);
}

/* 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 (skb_vlan_tag_present(skb)) {
		*vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
	} else {
		*vid = 0;
		err = -EINVAL;
	}

	return err;
}

static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
{
	if (!vg)
		return 0;

	smp_rmb();
	return vg->pvid;
}

static inline int br_vlan_enabled(struct net_bridge *br)
{
	return br->vlan_enabled;
}
#else
static inline bool br_allowed_ingress(const struct net_bridge *br,
				      struct net_bridge_vlan_group *vg,
				      struct sk_buff *skb,
				      u16 *vid)
{
	return true;
}

static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
				     const struct sk_buff *skb)
{
	return true;
}

static inline bool br_should_learn(struct net_bridge_port *p,
				   struct sk_buff *skb, u16 *vid)
{
	return true;
}

static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
					     struct net_bridge_vlan_group *vg,
					     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 void br_recalculate_fwd_mask(struct net_bridge *br)
{
}

static inline int br_vlan_init(struct net_bridge *br)
{
	return 0;
}

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_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
						   u16 vid)
{
	return NULL;
}

static inline int nbp_vlan_init(struct net_bridge_port *port)
{
	return 0;
}

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_bridge_vlan_group *vg)
{
	return 0;
}

static inline int br_vlan_enabled(struct net_bridge *br)
{
	return 0;
}

static inline int __br_vlan_filter_toggle(struct net_bridge *br,
					  unsigned long val)
{
	return -EOPNOTSUPP;
}

static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
					 u32 filter_mask)
{
	return 0;
}

static inline struct net_bridge_vlan_group *br_vlan_group(
					const struct net_bridge *br)
{
	return NULL;
}

static inline struct net_bridge_vlan_group *nbp_vlan_group(
					const struct net_bridge_port *p)
{
	return NULL;
}

static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
					const struct net_bridge *br)
{
	return NULL;
}

static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
					const struct net_bridge_port *p)
{
	return NULL;
}

static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
				     struct br_vlan_stats *stats)
{
}
#endif

struct nf_br_ops {
	int (*br_dev_xmit_hook)(struct sk_buff *skb);
};
extern const struct nf_br_ops __rcu *nf_br_ops;

/* br_netfilter.c */
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
int br_nf_core_init(void);
void br_nf_core_fini(void);
void br_netfilter_rtable_init(struct net_bridge *);
#else
static inline int br_nf_core_init(void) { return 0; }
static inline void br_nf_core_fini(void) {}
#define br_netfilter_rtable_init(x)
#endif

/* br_stp.c */
void br_set_state(struct net_bridge_port *p, unsigned int state);
struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
void br_init_port(struct net_bridge_port *p);
void br_become_designated_port(struct net_bridge_port *p);

void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
int br_set_forward_delay(struct net_bridge *br, unsigned long x);
int br_set_hello_time(struct net_bridge *br, unsigned long x);
int br_set_max_age(struct net_bridge *br, unsigned long x);
int br_set_ageing_time(struct net_bridge *br, u32 ageing_time);


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

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

/* br_stp_timer.c */
void br_stp_timer_init(struct net_bridge *br);
void br_stp_port_timer_init(struct net_bridge_port *p);
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
extern int (*br_fdb_get_active_sub_port_hook)(const struct net_bridge_port *p,
							uint32_t *sub_port_bitmap, int size);
/* br_netlink.c */
extern struct rtnl_link_ops br_link_ops;
int br_netlink_init(void);
void br_netlink_fini(void);
void br_ifinfo_notify(int event, struct net_bridge_port *port);
int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
	       u32 filter_mask, int nlflags);

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

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