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, 29 const struct nlmsghdr *nlh); 30 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, 31 gfp_t flags, u32 portid, const struct nlmsghdr *nlh); 32 33 34 /* RTNL is used as a global lock for all changes to network configuration */ 35 extern void rtnl_lock(void); 36 extern void rtnl_unlock(void); 37 extern int rtnl_trylock(void); 38 extern int rtnl_is_locked(void); 39 extern int rtnl_lock_killable(void); 40 extern bool refcount_dec_and_rtnl_lock(refcount_t *r); 41 42 extern wait_queue_head_t netdev_unregistering_wq; 43 extern struct rw_semaphore pernet_ops_rwsem; 44 extern struct rw_semaphore net_rwsem; 45 46 #ifdef CONFIG_PROVE_LOCKING 47 extern bool lockdep_rtnl_is_held(void); 48 #else 49 static inline bool lockdep_rtnl_is_held(void) 50 { 51 return true; 52 } 53 #endif /* #ifdef CONFIG_PROVE_LOCKING */ 54 55 /** 56 * rcu_dereference_rtnl - rcu_dereference with debug checking 57 * @p: The pointer to read, prior to dereferencing 58 * 59 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock() 60 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference() 61 */ 62 #define rcu_dereference_rtnl(p) \ 63 rcu_dereference_check(p, lockdep_rtnl_is_held()) 64 65 /** 66 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL 67 * @p: The pointer to read, prior to dereferencing 68 * 69 * Return the value of the specified RCU-protected pointer, but omit 70 * the READ_ONCE(), because caller holds RTNL. 71 */ 72 #define rtnl_dereference(p) \ 73 rcu_dereference_protected(p, lockdep_rtnl_is_held()) 74 75 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev) 76 { 77 return rtnl_dereference(dev->ingress_queue); 78 } 79 80 static inline struct netdev_queue *dev_ingress_queue_rcu(struct net_device *dev) 81 { 82 return rcu_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 void netdev_xmit_skip_txqueue(bool skip); 96 #endif 97 98 void rtnetlink_init(void); 99 void __rtnl_unlock(void); 100 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail); 101 102 #define ASSERT_RTNL() \ 103 WARN_ONCE(!rtnl_is_locked(), \ 104 "RTNL: assertion failed at %s (%d)\n", __FILE__, __LINE__) 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)); 130 131 extern void rtnl_offload_xstats_notify(struct net_device *dev); 132 133 #endif /* __LINUX_RTNETLINK_H */ 134