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