include/linux/rtnetlink.h

   1 #ifndef __LINUX_RTNETLINK_H
   2 #define __LINUX_RTNETLINK_H
   3
   4
   5 #include <linux/mutex.h>
   6 #include <linux/netdevice.h>
   7 #include <linux/wait.h>
   8 #include <uapi/linux/rtnetlink.h>
   9
  10 extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
  11 extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid);
  12 extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid,
  13                         u32 group, struct nlmsghdr *nlh, gfp_t flags);
  14 extern void rtnl_set_sk_err(struct net *net, u32 group, int error);
  15 extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
  16 extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
  17                               u32 id, long expires, u32 error);
  18
  19 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change, gfp_t flags);
  20
  21 /* RTNL is used as a global lock for all changes to network configuration  */
  22 extern void rtnl_lock(void);
  23 extern void rtnl_unlock(void);
  24 extern int rtnl_trylock(void);
  25 extern int rtnl_is_locked(void);
  26
  27 extern wait_queue_head_t netdev_unregistering_wq;
  28 extern struct mutex net_mutex;
  29
  30 #ifdef CONFIG_PROVE_LOCKING
  31 extern int lockdep_rtnl_is_held(void);
  32 #else
  33 static inline int lockdep_rtnl_is_held(void)
  34 {
  35         return 1;
  36 }
  37 #endif /* #ifdef CONFIG_PROVE_LOCKING */
  38
  39 /**
  40  * rcu_dereference_rtnl - rcu_dereference with debug checking
  41  * @p: The pointer to read, prior to dereferencing
  42  *
  43  * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
  44  * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
  45  */
  46 #define rcu_dereference_rtnl(p)                                 \
  47         rcu_dereference_check(p, lockdep_rtnl_is_held())
  48
  49 /**
  50  * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking
  51  * @p: The pointer to read, prior to dereference
  52  *
  53  * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh()
  54  * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh()
  55  */
  56 #define rcu_dereference_bh_rtnl(p)                              \
  57         rcu_dereference_bh_check(p, lockdep_rtnl_is_held())
  58
  59 /**
  60  * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
  61  * @p: The pointer to read, prior to dereferencing
  62  *
  63  * Return the value of the specified RCU-protected pointer, but omit
  64  * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
  65  * caller holds RTNL.
  66  */
  67 #define rtnl_dereference(p)                                     \
  68         rcu_dereference_protected(p, lockdep_rtnl_is_held())
  69
  70 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
  71 {
  72         return rtnl_dereference(dev->ingress_queue);
  73 }
  74
  75 extern struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
  76
  77 extern void rtnetlink_init(void);
  78 extern void __rtnl_unlock(void);
  79
  80 #define ASSERT_RTNL() do { \
  81         if (unlikely(!rtnl_is_locked())) { \
  82                 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
  83                        __FILE__,  __LINE__); \
  84                 dump_stack(); \
  85         } \
  86 } while(0)
  87
  88 extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
  89                              struct netlink_callback *cb,
  90                              struct net_device *dev,
  91                              struct net_device *filter_dev,
  92                              int idx);
  93 extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
  94                             struct nlattr *tb[],
  95                             struct net_device *dev,
  96                             const unsigned char *addr,
  97                              u16 flags);
  98 extern int ndo_dflt_fdb_del(struct ndmsg *ndm,
  99                             struct nlattr *tb[],
 100                             struct net_device *dev,
 101                             const unsigned char *addr);
 102
 103 extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 104                                    struct net_device *dev, u16 mode);
 105 #endif  /* __LINUX_RTNETLINK_H */