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