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 <uapi/linux/rtnetlink.h>
10
11 extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
12 extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid);
13 extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid,
14 u32 group, struct nlmsghdr *nlh, gfp_t flags);
15 extern void rtnl_set_sk_err(struct net *net, u32 group, int error);
16 extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
17 extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
18 u32 id, long expires, u32 error);
19
20 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change, gfp_t flags);
21 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
22 unsigned change, u32 event,
23 gfp_t flags);
24 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev,
25 gfp_t flags);
26
27
28 /* RTNL is used as a global lock for all changes to network configuration */
29 extern void rtnl_lock(void);
30 extern void rtnl_unlock(void);
31 extern int rtnl_trylock(void);
32 extern int rtnl_is_locked(void);
33
34 extern wait_queue_head_t netdev_unregistering_wq;
35 extern struct mutex net_mutex;
36
37 #ifdef CONFIG_PROVE_LOCKING
38 extern bool lockdep_rtnl_is_held(void);
39 #else
lockdep_rtnl_is_held(void)40 static inline bool lockdep_rtnl_is_held(void)
41 {
42 return true;
43 }
44 #endif /* #ifdef CONFIG_PROVE_LOCKING */
45
46 /**
47 * rcu_dereference_rtnl - rcu_dereference with debug checking
48 * @p: The pointer to read, prior to dereferencing
49 *
50 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
51 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
52 */
53 #define rcu_dereference_rtnl(p) \
54 rcu_dereference_check(p, lockdep_rtnl_is_held())
55
56 /**
57 * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking
58 * @p: The pointer to read, prior to dereference
59 *
60 * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh()
61 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh()
62 */
63 #define rcu_dereference_bh_rtnl(p) \
64 rcu_dereference_bh_check(p, lockdep_rtnl_is_held())
65
66 /**
67 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
68 * @p: The pointer to read, prior to dereferencing
69 *
70 * Return the value of the specified RCU-protected pointer, but omit
71 * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
72 * caller holds RTNL.
73 */
74 #define rtnl_dereference(p) \
75 rcu_dereference_protected(p, lockdep_rtnl_is_held())
76
dev_ingress_queue(struct net_device * dev)77 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
78 {
79 return rtnl_dereference(dev->ingress_queue);
80 }
81
82 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
83
84 #ifdef CONFIG_NET_INGRESS
85 void net_inc_ingress_queue(void);
86 void net_dec_ingress_queue(void);
87 #endif
88
89 #ifdef CONFIG_NET_EGRESS
90 void net_inc_egress_queue(void);
91 void net_dec_egress_queue(void);
92 #endif
93
94 void rtnetlink_init(void);
95 void __rtnl_unlock(void);
96 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail);
97
98 #define ASSERT_RTNL() do { \
99 if (unlikely(!rtnl_is_locked())) { \
100 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
101 __FILE__, __LINE__); \
102 dump_stack(); \
103 } \
104 } while(0)
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 #endif /* __LINUX_RTNETLINK_H */
131