include/linux/rtnetlink.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_RTNETLINK_H
   3 #define __LINUX_RTNETLINK_H
   4
   5
   6 #include <linux/mutex.h>
   7 #include <linux/netdevice.h>
   8 #include <linux/wait.h>
   9 #include <uapi/linux/rtnetlink.h>
  10
  11 extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
  12 extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid);
  13 extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid,
  14                         u32 group, struct nlmsghdr *nlh, gfp_t flags);
  15 extern void rtnl_set_sk_err(struct net *net, u32 group, int error);
  16 extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
  17 extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
  18                               u32 id, long expires, u32 error);
  19
  20 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change, gfp_t flags);
  21 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
  22                                        unsigned change, u32 event,
  23                                        gfp_t flags);
  24 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev,
  25                        gfp_t flags);
  26
  27
  28 /* RTNL is used as a global lock for all changes to network configuration  */
  29 extern void rtnl_lock(void);
  30 extern void rtnl_unlock(void);
  31 extern int rtnl_trylock(void);
  32 extern int rtnl_is_locked(void);
  33
  34 extern wait_queue_head_t netdev_unregistering_wq;
  35 extern struct mutex net_mutex;
  36
  37 #ifdef CONFIG_PROVE_LOCKING
  38 extern bool lockdep_rtnl_is_held(void);
  39 #else
  40 static inline bool lockdep_rtnl_is_held(void)
  41 {
  42         return true;
  43 }
  44 #endif /* #ifdef CONFIG_PROVE_LOCKING */
  45
  46 /**
  47  * rcu_dereference_rtnl - rcu_dereference with debug checking
  48  * @p: The pointer to read, prior to dereferencing
  49  *
  50  * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
  51  * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
  52  */
  53 #define rcu_dereference_rtnl(p)                                 \
  54         rcu_dereference_check(p, lockdep_rtnl_is_held())
  55
  56 /**
  57  * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking
  58  * @p: The pointer to read, prior to dereference
  59  *
  60  * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh()
  61  * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh()
  62  */
  63 #define rcu_dereference_bh_rtnl(p)                              \
  64         rcu_dereference_bh_check(p, lockdep_rtnl_is_held())
  65
  66 /**
  67  * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
  68  * @p: The pointer to read, prior to dereferencing
  69  *
  70  * Return the value of the specified RCU-protected pointer, but omit
  71  * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
  72  * caller holds RTNL.
  73  */
  74 #define rtnl_dereference(p)                                     \
  75         rcu_dereference_protected(p, lockdep_rtnl_is_held())
  76
  77 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
  78 {
  79         return rtnl_dereference(dev->ingress_queue);
  80 }
  81
  82 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
  83
  84 #ifdef CONFIG_NET_INGRESS
  85 void net_inc_ingress_queue(void);
  86 void net_dec_ingress_queue(void);
  87 #endif
  88
  89 #ifdef CONFIG_NET_EGRESS
  90 void net_inc_egress_queue(void);
  91 void net_dec_egress_queue(void);
  92 #endif
  93
  94 void rtnetlink_init(void);
  95 void __rtnl_unlock(void);
  96 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail);
  97
  98 #define ASSERT_RTNL() do { \
  99         if (unlikely(!rtnl_is_locked())) { \
 100                 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
 101                        __FILE__,  __LINE__); \
 102                 dump_stack(); \
 103         } \
 104 } while(0)
 105
 106 extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
 107                              struct netlink_callback *cb,
 108                              struct net_device *dev,
 109                              struct net_device *filter_dev,
 110                              int *idx);
 111 extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
 112                             struct nlattr *tb[],
 113                             struct net_device *dev,
 114                             const unsigned char *addr,
 115                             u16 vid,
 116                             u16 flags);
 117 extern int ndo_dflt_fdb_del(struct ndmsg *ndm,
 118                             struct nlattr *tb[],
 119                             struct net_device *dev,
 120                             const unsigned char *addr,
 121                             u16 vid);
 122
 123 extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 124                                    struct net_device *dev, u16 mode,
 125                                    u32 flags, u32 mask, int nlflags,
 126                                    u32 filter_mask,
 127                                    int (*vlan_fill)(struct sk_buff *skb,
 128                                                     struct net_device *dev,
 129                                                     u32 filter_mask));
 130 #endif  /* __LINUX_RTNETLINK_H */