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 READ_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 */ 131