linux/include/linux/rtnetlink.h
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   1#ifndef __LINUX_RTNETLINK_H
   2#define __LINUX_RTNETLINK_H
   3
   4
   5#include <linux/mutex.h>
   6#include <linux/netdevice.h>
   7#include <uapi/linux/rtnetlink.h>
   8
   9extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
  10extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid);
  11extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid,
  12                        u32 group, struct nlmsghdr *nlh, gfp_t flags);
  13extern void rtnl_set_sk_err(struct net *net, u32 group, int error);
  14extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
  15extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
  16                              u32 id, long expires, u32 error);
  17
  18extern void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change);
  19
  20/* RTNL is used as a global lock for all changes to network configuration  */
  21extern void rtnl_lock(void);
  22extern void rtnl_unlock(void);
  23extern int rtnl_trylock(void);
  24extern int rtnl_is_locked(void);
  25#ifdef CONFIG_PROVE_LOCKING
  26extern int lockdep_rtnl_is_held(void);
  27#endif /* #ifdef CONFIG_PROVE_LOCKING */
  28
  29/**
  30 * rcu_dereference_rtnl - rcu_dereference with debug checking
  31 * @p: The pointer to read, prior to dereferencing
  32 *
  33 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
  34 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
  35 */
  36#define rcu_dereference_rtnl(p)                                 \
  37        rcu_dereference_check(p, lockdep_rtnl_is_held())
  38
  39/**
  40 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
  41 * @p: The pointer to read, prior to dereferencing
  42 *
  43 * Return the value of the specified RCU-protected pointer, but omit
  44 * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
  45 * caller holds RTNL.
  46 */
  47#define rtnl_dereference(p)                                     \
  48        rcu_dereference_protected(p, lockdep_rtnl_is_held())
  49
  50static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
  51{
  52        return rtnl_dereference(dev->ingress_queue);
  53}
  54
  55extern struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
  56
  57extern void rtnetlink_init(void);
  58extern void __rtnl_unlock(void);
  59
  60#define ASSERT_RTNL() do { \
  61        if (unlikely(!rtnl_is_locked())) { \
  62                printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
  63                       __FILE__,  __LINE__); \
  64                dump_stack(); \
  65        } \
  66} while(0)
  67
  68extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
  69                             struct netlink_callback *cb,
  70                             struct net_device *dev,
  71                             int idx);
  72#endif  /* __LINUX_RTNETLINK_H */
  73
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