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); 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 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, 27 gfp_t flags); 28 29 30 /* RTNL is used as a global lock for all changes to network configuration */ 31 extern void rtnl_lock(void); 32 extern void rtnl_unlock(void); 33 extern int rtnl_trylock(void); 34 extern int rtnl_is_locked(void); 35 36 extern wait_queue_head_t netdev_unregistering_wq; 37 extern struct mutex net_mutex; 38 39 #ifdef CONFIG_PROVE_LOCKING 40 extern bool lockdep_rtnl_is_held(void); 41 #else 42 static inline bool lockdep_rtnl_is_held(void) 43 { 44 return true; 45 } 46 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 47 48 /** 49 * rcu_dereference_rtnl - rcu_dereference with debug checking 50 * @p: The pointer to read, prior to dereferencing 51 * 52 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock() 53 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference() 54 */ 55 #define rcu_dereference_rtnl(p) \ 56 rcu_dereference_check(p, lockdep_rtnl_is_held()) 57 58 /** 59 * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking 60 * @p: The pointer to read, prior to dereference 61 * 62 * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh() 63 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh() 64 */ 65 #define rcu_dereference_bh_rtnl(p) \ 66 rcu_dereference_bh_check(p, lockdep_rtnl_is_held()) 67 68 /** 69 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL 70 * @p: The pointer to read, prior to dereferencing 71 * 72 * Return the value of the specified RCU-protected pointer, but omit 73 * the READ_ONCE(), because caller holds RTNL. 74 */ 75 #define rtnl_dereference(p) \ 76 rcu_dereference_protected(p, lockdep_rtnl_is_held()) 77 78 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev) 79 { 80 return rtnl_dereference(dev->ingress_queue); 81 } 82 83 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev); 84 85 #ifdef CONFIG_NET_INGRESS 86 void net_inc_ingress_queue(void); 87 void net_dec_ingress_queue(void); 88 #endif 89 90 #ifdef CONFIG_NET_EGRESS 91 void net_inc_egress_queue(void); 92 void net_dec_egress_queue(void); 93 #endif 94 95 void rtnetlink_init(void); 96 void __rtnl_unlock(void); 97 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail); 98 99 #define ASSERT_RTNL() do { \ 100 if (unlikely(!rtnl_is_locked())) { \ 101 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \ 102 __FILE__, __LINE__); \ 103 dump_stack(); \ 104 } \ 105 } while(0) 106 107 extern int ndo_dflt_fdb_dump(struct sk_buff *skb, 108 struct netlink_callback *cb, 109 struct net_device *dev, 110 struct net_device *filter_dev, 111 int *idx); 112 extern int ndo_dflt_fdb_add(struct ndmsg *ndm, 113 struct nlattr *tb[], 114 struct net_device *dev, 115 const unsigned char *addr, 116 u16 vid, 117 u16 flags); 118 extern int ndo_dflt_fdb_del(struct ndmsg *ndm, 119 struct nlattr *tb[], 120 struct net_device *dev, 121 const unsigned char *addr, 122 u16 vid); 123 124 extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 125 struct net_device *dev, u16 mode, 126 u32 flags, u32 mask, int nlflags, 127 u32 filter_mask, 128 int (*vlan_fill)(struct sk_buff *skb, 129 struct net_device *dev, 130 u32 filter_mask)); 131 #endif /* __LINUX_RTNETLINK_H */ 132