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linux/net/bridge/br_private.h
Hong Zhiguo 716ec052d2 bridge: fix NULL pointer deref of br_port_get_rcu 
The NULL deref happens when br_handle_frame is called between these
2 lines of del_nbp:
	dev->priv_flags &= ~IFF_BRIDGE_PORT;
	/* --> br_handle_frame is called at this time */
	netdev_rx_handler_unregister(dev);

In br_handle_frame the return of br_port_get_rcu(dev) is dereferenced
without check but br_port_get_rcu(dev) returns NULL if:
	!(dev->priv_flags & IFF_BRIDGE_PORT)

Eric Dumazet pointed out the testing of IFF_BRIDGE_PORT is not necessary
here since we're in rcu_read_lock and we have synchronize_net() in
netdev_rx_handler_unregister. So remove the testing of IFF_BRIDGE_PORT
and by the previous patch, make sure br_port_get_rcu is called in
bridging code.

Signed-off-by: Hong Zhiguo <zhiguohong@tencent.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-09-15 22:03:33 -04:00

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/*
* 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;
};
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
/* our own querier */
struct bridge_mcast_query {
struct timer_list timer;
u32 startup_sent;
};
/* other querier */
struct bridge_mcast_querier {
struct timer_list timer;
unsigned long delay_time;
};
#endif
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;
bool timer_armed;
};
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
#define BR_LEARNING 0x00000020
#define BR_FLOOD 0x00000040
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
struct bridge_mcast_query ip4_query;
#if IS_ENABLED(CONFIG_IPV6)
struct bridge_mcast_query ip6_query;
#endif /* IS_ENABLED(CONFIG_IPV6) */
unsigned char multicast_router;
struct timer_list multicast_router_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;
u8 multicast_query_use_ifaddr:1;
u32 hash_elasticity;
u32 hash_max;
u32 multicast_last_member_count;
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 bridge_mcast_querier ip4_querier;
struct bridge_mcast_query ip4_query;
#if IS_ENABLED(CONFIG_IPV6)
struct bridge_mcast_querier ip6_querier;
struct bridge_mcast_query ip6_query;
#endif /* IS_ENABLED(CONFIG_IPV6) */
#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 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 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,
bool unicast);
extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
struct sk_buff *skb2, bool unicast);
/* 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 __rcu *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))
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 bool
__br_multicast_querier_exists(struct net_bridge *br,
struct bridge_mcast_querier *querier)
{
return time_is_before_jiffies(querier->delay_time) &&
(br->multicast_querier || 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_querier);
#if IS_ENABLED(CONFIG_IPV6)
case (htons(ETH_P_IPV6)):
return __br_multicast_querier_exists(br, &br->ip6_querier);
#endif
default:
return false;
}
}
#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 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
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
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