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 37 extern wait_queue_head_t netdev_unregistering_wq; 38 extern struct mutex net_mutex; 39 extern struct rw_semaphore net_sem; 40 41 #ifdef CONFIG_PROVE_LOCKING 42 extern bool lockdep_rtnl_is_held(void); 43 #else 44 static inline bool lockdep_rtnl_is_held(void) 45 { 46 return true; 47 } 48 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 49 50 /** 51 * rcu_dereference_rtnl - rcu_dereference with debug checking 52 * @p: The pointer to read, prior to dereferencing 53 * 54 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock() 55 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference() 56 */ 57 #define rcu_dereference_rtnl(p) \ 58 rcu_dereference_check(p, lockdep_rtnl_is_held()) 59 60 /** 61 * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking 62 * @p: The pointer to read, prior to dereference 63 * 64 * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh() 65 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh() 66 */ 67 #define rcu_dereference_bh_rtnl(p) \ 68 rcu_dereference_bh_check(p, lockdep_rtnl_is_held()) 69 70 /** 71 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL 72 * @p: The pointer to read, prior to dereferencing 73 * 74 * Return the value of the specified RCU-protected pointer, but omit 75 * the READ_ONCE(), because caller holds RTNL. 76 */ 77 #define rtnl_dereference(p) \ 78 rcu_dereference_protected(p, lockdep_rtnl_is_held()) 79 80 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev) 81 { 82 return rtnl_dereference(dev->ingress_queue); 83 } 84 85 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev); 86 87 #ifdef CONFIG_NET_INGRESS 88 void net_inc_ingress_queue(void); 89 void net_dec_ingress_queue(void); 90 #endif 91 92 #ifdef CONFIG_NET_EGRESS 93 void net_inc_egress_queue(void); 94 void net_dec_egress_queue(void); 95 #endif 96 97 void rtnetlink_init(void); 98 void __rtnl_unlock(void); 99 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail); 100 101 #define ASSERT_RTNL() \ 102 WARN_ONCE(!rtnl_is_locked(), \ 103 "RTNL: assertion failed at %s (%d)\n", __FILE__, __LINE__) 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 */ 130