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 */ 138