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, const 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 int change, gfp_t flags, 22 u32 portid, const struct nlmsghdr *nlh); 23 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 24 gfp_t flags, int *new_nsid, int new_ifindex); 25 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev, 26 unsigned change, u32 event, 27 gfp_t flags, int *new_nsid, 28 int new_ifindex, u32 portid, u32 seq); 29 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, 30 gfp_t flags, u32 portid, const struct nlmsghdr *nlh); 31 32 33 /* RTNL is used as a global lock for all changes to network configuration */ 34 extern void rtnl_lock(void); 35 extern void rtnl_unlock(void); 36 extern int rtnl_trylock(void); 37 extern int rtnl_is_locked(void); 38 extern int rtnl_lock_killable(void); 39 extern bool refcount_dec_and_rtnl_lock(refcount_t *r); 40 41 extern wait_queue_head_t netdev_unregistering_wq; 42 extern struct rw_semaphore pernet_ops_rwsem; 43 extern struct rw_semaphore net_rwsem; 44 45 #ifdef CONFIG_PROVE_LOCKING 46 extern bool lockdep_rtnl_is_held(void); 47 #else 48 static inline bool lockdep_rtnl_is_held(void) 49 { 50 return true; 51 } 52 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 53 54 /** 55 * rcu_dereference_rtnl - rcu_dereference with debug checking 56 * @p: The pointer to read, prior to dereferencing 57 * 58 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock() 59 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference() 60 */ 61 #define rcu_dereference_rtnl(p) \ 62 rcu_dereference_check(p, lockdep_rtnl_is_held()) 63 64 /** 65 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL 66 * @p: The pointer to read, prior to dereferencing 67 * 68 * Return the value of the specified RCU-protected pointer, but omit 69 * the READ_ONCE(), because caller holds RTNL. 70 */ 71 #define rtnl_dereference(p) \ 72 rcu_dereference_protected(p, lockdep_rtnl_is_held()) 73 74 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev) 75 { 76 return rtnl_dereference(dev->ingress_queue); 77 } 78 79 static inline struct netdev_queue *dev_ingress_queue_rcu(struct net_device *dev) 80 { 81 return rcu_dereference(dev->ingress_queue); 82 } 83 84 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev); 85 86 #ifdef CONFIG_NET_INGRESS 87 void net_inc_ingress_queue(void); 88 void net_dec_ingress_queue(void); 89 #endif 90 91 #ifdef CONFIG_NET_EGRESS 92 void net_inc_egress_queue(void); 93 void net_dec_egress_queue(void); 94 void netdev_xmit_skip_txqueue(bool skip); 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)); 129 130 extern void rtnl_offload_xstats_notify(struct net_device *dev); 131 132 #endif /* __LINUX_RTNETLINK_H */ 133