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
lockdep_rtnl_is_held(void)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
dev_ingress_queue(struct net_device * dev)75 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
76 {
77 return rtnl_dereference(dev->ingress_queue);
78 }
79
dev_ingress_queue_rcu(struct net_device * dev)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