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 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 22 gfp_t flags, int *new_nsid, int new_ifindex); 23 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 24 unsigned change, u32 event, 25 gfp_t flags, int *new_nsid, 26 int new_ifindex); 27 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, 28 gfp_t flags); 29 30 31 /* RTNL is used as a global lock for all changes to network configuration */ 32 extern void rtnl_lock(void); 33 extern void rtnl_unlock(void); 34 extern int rtnl_trylock(void); 35 extern int rtnl_is_locked(void); 36 extern int rtnl_lock_killable(void); 37 38 extern wait_queue_head_t netdev_unregistering_wq; 39 extern struct rw_semaphore pernet_ops_rwsem; 40 extern struct rw_semaphore net_rwsem; 41 42 #ifdef CONFIG_PROVE_LOCKING 43 extern bool lockdep_rtnl_is_held(void); 44 #else 45 static inline bool lockdep_rtnl_is_held(void) 46 { 47 return true; 48 } 49 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 50 51 /** 52 * rcu_dereference_rtnl - rcu_dereference with debug checking 53 * @p: The pointer to read, prior to dereferencing 54 * 55 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock() 56 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference() 57 */ 58 #define rcu_dereference_rtnl(p) \ 59 rcu_dereference_check(p, lockdep_rtnl_is_held()) 60 61 /** 62 * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking 63 * @p: The pointer to read, prior to dereference 64 * 65 * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh() 66 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh() 67 */ 68 #define rcu_dereference_bh_rtnl(p) \ 69 rcu_dereference_bh_check(p, lockdep_rtnl_is_held()) 70 71 /** 72 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL 73 * @p: The pointer to read, prior to dereferencing 74 * 75 * Return the value of the specified RCU-protected pointer, but omit 76 * the READ_ONCE(), because caller holds RTNL. 77 */ 78 #define rtnl_dereference(p) \ 79 rcu_dereference_protected(p, lockdep_rtnl_is_held()) 80 81 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev) 82 { 83 return rtnl_dereference(dev->ingress_queue); 84 } 85 86 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev); 87 88 #ifdef CONFIG_NET_INGRESS 89 void net_inc_ingress_queue(void); 90 void net_dec_ingress_queue(void); 91 #endif 92 93 #ifdef CONFIG_NET_EGRESS 94 void net_inc_egress_queue(void); 95 void net_dec_egress_queue(void); 96 #endif 97 98 void rtnetlink_init(void); 99 void __rtnl_unlock(void); 100 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail); 101 102 #define ASSERT_RTNL() \ 103 WARN_ONCE(!rtnl_is_locked(), \ 104 "RTNL: assertion failed at %s (%d)\n", __FILE__, __LINE__) 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 */ 131