rtnetlink.h 4.2 KB
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_RTNETLINK_H
#define __LINUX_RTNETLINK_H


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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/wait.h>
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#include <uapi/linux/rtnetlink.h>
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extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid);
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extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid,
			u32 group, struct nlmsghdr *nlh, gfp_t flags);
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extern void rtnl_set_sk_err(struct net *net, u32 group, int error);
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extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
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extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
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			      u32 id, long expires, u32 error);
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void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change, gfp_t flags);
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void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
			 gfp_t flags, int *new_nsid);
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struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
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				       unsigned change, u32 event,
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				       gfp_t flags, int *new_nsid);
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void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev,
		       gfp_t flags);

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/* RTNL is used as a global lock for all changes to network configuration  */
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extern void rtnl_lock(void);
extern void rtnl_unlock(void);
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extern int rtnl_trylock(void);
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extern int rtnl_is_locked(void);
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extern wait_queue_head_t netdev_unregistering_wq;
extern struct mutex net_mutex;

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#ifdef CONFIG_PROVE_LOCKING
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extern bool lockdep_rtnl_is_held(void);
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#else
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static inline bool lockdep_rtnl_is_held(void)
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{
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	return true;
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}
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#endif /* #ifdef CONFIG_PROVE_LOCKING */
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/**
 * rcu_dereference_rtnl - rcu_dereference with debug checking
 * @p: The pointer to read, prior to dereferencing
 *
 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
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 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
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 */
#define rcu_dereference_rtnl(p)					\
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	rcu_dereference_check(p, lockdep_rtnl_is_held())
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/**
 * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking
 * @p: The pointer to read, prior to dereference
 *
 * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh()
 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh()
 */
#define rcu_dereference_bh_rtnl(p)				\
	rcu_dereference_bh_check(p, lockdep_rtnl_is_held())

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/**
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 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
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 * @p: The pointer to read, prior to dereferencing
 *
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 * Return the value of the specified RCU-protected pointer, but omit
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 * both the smp_read_barrier_depends() and the READ_ONCE(), because
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 * caller holds RTNL.
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 */
#define rtnl_dereference(p)					\
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	rcu_dereference_protected(p, lockdep_rtnl_is_held())
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static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
{
	return rtnl_dereference(dev->ingress_queue);
}

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struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);

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#ifdef CONFIG_NET_INGRESS
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void net_inc_ingress_queue(void);
void net_dec_ingress_queue(void);
#endif
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#ifdef CONFIG_NET_EGRESS
void net_inc_egress_queue(void);
void net_dec_egress_queue(void);
#endif

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void rtnetlink_init(void);
void __rtnl_unlock(void);
void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail);
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#define ASSERT_RTNL() \
	WARN_ONCE(!rtnl_is_locked(), \
		  "RTNL: assertion failed at %s (%d)\n", __FILE__,  __LINE__)
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extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
			     struct netlink_callback *cb,
			     struct net_device *dev,
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			     struct net_device *filter_dev,
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			     int *idx);
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extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
			    struct nlattr *tb[],
			    struct net_device *dev,
			    const unsigned char *addr,
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			    u16 vid,
			    u16 flags);
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extern int ndo_dflt_fdb_del(struct ndmsg *ndm,
			    struct nlattr *tb[],
			    struct net_device *dev,
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			    const unsigned char *addr,
			    u16 vid);
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extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
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				   struct net_device *dev, u16 mode,
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				   u32 flags, u32 mask, int nlflags,
				   u32 filter_mask,
				   int (*vlan_fill)(struct sk_buff *skb,
						    struct net_device *dev,
						    u32 filter_mask));
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#endif	/* __LINUX_RTNETLINK_H */