rtnetlink.h (4670B)
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 12extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo); 13extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid); 14extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, 15 u32 group, struct nlmsghdr *nlh, gfp_t flags); 16extern void rtnl_set_sk_err(struct net *net, u32 group, int error); 17extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics); 18extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, 19 u32 id, long expires, u32 error); 20 21void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change, gfp_t flags); 22void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 23 gfp_t flags, int *new_nsid, int new_ifindex); 24struct 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); 28void 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 */ 33extern void rtnl_lock(void); 34extern void rtnl_unlock(void); 35extern int rtnl_trylock(void); 36extern int rtnl_is_locked(void); 37extern int rtnl_lock_killable(void); 38extern bool refcount_dec_and_rtnl_lock(refcount_t *r); 39 40extern wait_queue_head_t netdev_unregistering_wq; 41extern struct rw_semaphore pernet_ops_rwsem; 42extern struct rw_semaphore net_rwsem; 43 44#ifdef CONFIG_PROVE_LOCKING 45extern bool lockdep_rtnl_is_held(void); 46#else 47static 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 83static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev) 84{ 85 return rtnl_dereference(dev->ingress_queue); 86} 87 88static inline struct netdev_queue *dev_ingress_queue_rcu(struct net_device *dev) 89{ 90 return rcu_dereference(dev->ingress_queue); 91} 92 93struct netdev_queue *dev_ingress_queue_create(struct net_device *dev); 94 95#ifdef CONFIG_NET_INGRESS 96void net_inc_ingress_queue(void); 97void net_dec_ingress_queue(void); 98#endif 99 100#ifdef CONFIG_NET_EGRESS 101void net_inc_egress_queue(void); 102void net_dec_egress_queue(void); 103void netdev_xmit_skip_txqueue(bool skip); 104#endif 105 106void rtnetlink_init(void); 107void __rtnl_unlock(void); 108void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail); 109 110#define ASSERT_RTNL() \ 111 WARN_ONCE(!rtnl_is_locked(), \ 112 "RTNL: assertion failed at %s (%d)\n", __FILE__, __LINE__) 113 114extern int ndo_dflt_fdb_dump(struct sk_buff *skb, 115 struct netlink_callback *cb, 116 struct net_device *dev, 117 struct net_device *filter_dev, 118 int *idx); 119extern int ndo_dflt_fdb_add(struct ndmsg *ndm, 120 struct nlattr *tb[], 121 struct net_device *dev, 122 const unsigned char *addr, 123 u16 vid, 124 u16 flags); 125extern int ndo_dflt_fdb_del(struct ndmsg *ndm, 126 struct nlattr *tb[], 127 struct net_device *dev, 128 const unsigned char *addr, 129 u16 vid); 130 131extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, 132 struct net_device *dev, u16 mode, 133 u32 flags, u32 mask, int nlflags, 134 u32 filter_mask, 135 int (*vlan_fill)(struct sk_buff *skb, 136 struct net_device *dev, 137 u32 filter_mask)); 138 139extern void rtnl_offload_xstats_notify(struct net_device *dev); 140 141#endif /* __LINUX_RTNETLINK_H */