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 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
  21                                        unsigned change, gfp_t flags);
  22 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev,
  23                        gfp_t flags);
  24
  25
  26 /* RTNL is used as a global lock for all changes to network configuration  */
  27 extern void rtnl_lock(void);
  28 extern void rtnl_unlock(void);
  29 extern int rtnl_trylock(void);
  30 extern int rtnl_is_locked(void);
  31
  32 extern wait_queue_head_t netdev_unregistering_wq;
  33 extern struct mutex net_mutex;
  34
  35 #ifdef CONFIG_PROVE_LOCKING
  36 extern bool lockdep_rtnl_is_held(void);
  37 #else
  38 static inline bool lockdep_rtnl_is_held(void)
  39 {
  40         return true;
  41 }
  42 #endif /* #ifdef CONFIG_PROVE_LOCKING */
  43
  44 /**
  45  * rcu_dereference_rtnl - rcu_dereference with debug checking
  46  * @p: The pointer to read, prior to dereferencing
  47  *
  48  * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
  49  * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
  50  */
  51 #define rcu_dereference_rtnl(p)                                 \
  52         rcu_dereference_check(p, lockdep_rtnl_is_held())
  53
  54 /**
  55  * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking
  56  * @p: The pointer to read, prior to dereference
  57  *
  58  * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh()
  59  * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh()
  60  */
  61 #define rcu_dereference_bh_rtnl(p)                              \
  62         rcu_dereference_bh_check(p, lockdep_rtnl_is_held())
  63
  64 /**
  65  * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
  66  * @p: The pointer to read, prior to dereferencing
  67  *
  68  * Return the value of the specified RCU-protected pointer, but omit
  69  * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
  70  * caller holds RTNL.
  71  */
  72 #define rtnl_dereference(p)                                     \
  73         rcu_dereference_protected(p, lockdep_rtnl_is_held())
  74
  75 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
  76 {
  77         return rtnl_dereference(dev->ingress_queue);
  78 }
  79
  80 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
  81
  82 #ifdef CONFIG_NET_INGRESS
  83 void net_inc_ingress_queue(void);
  84 void net_dec_ingress_queue(void);
  85 #endif
  86
  87 #ifdef CONFIG_NET_EGRESS
  88 void net_inc_egress_queue(void);
  89 void net_dec_egress_queue(void);
  90 #endif
  91
  92 extern void rtnetlink_init(void);
  93 extern void __rtnl_unlock(void);
  94
  95 #define ASSERT_RTNL() do { \
  96         if (unlikely(!rtnl_is_locked())) { \
  97                 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
  98                        __FILE__,  __LINE__); \
  99                 dump_stack(); \
 100         } \
 101 } while(0)
 102
 103 extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
 104                              struct netlink_callback *cb,
 105                              struct net_device *dev,
 106                              struct net_device *filter_dev,
 107                              int idx);
 108 extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
 109                             struct nlattr *tb[],
 110                             struct net_device *dev,
 111                             const unsigned char *addr,
 112                             u16 vid,
 113                             u16 flags);
 114 extern int ndo_dflt_fdb_del(struct ndmsg *ndm,
 115                             struct nlattr *tb[],
 116                             struct net_device *dev,
 117                             const unsigned char *addr,
 118                             u16 vid);
 119
 120 extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 121                                    struct net_device *dev, u16 mode,
 122                                    u32 flags, u32 mask, int nlflags,
 123                                    u32 filter_mask,
 124                                    int (*vlan_fill)(struct sk_buff *skb,
 125                                                     struct net_device *dev,
 126                                                     u32 filter_mask));
 127 #endif  /* __LINUX_RTNETLINK_H */