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 <linux/cleanup.h>
11 #include <uapi/linux/rtnetlink.h>
12
13 extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
14
rtnetlink_maybe_send(struct sk_buff * skb,struct net * net,u32 pid,u32 group,int echo)15 static inline int rtnetlink_maybe_send(struct sk_buff *skb, struct net *net,
16 u32 pid, u32 group, int echo)
17 {
18 return !skb ? 0 : rtnetlink_send(skb, net, pid, group, echo);
19 }
20
21 extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid);
22 extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid,
23 u32 group, const struct nlmsghdr *nlh, gfp_t flags);
24 extern void rtnl_set_sk_err(struct net *net, u32 group, int error);
25 extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
26 extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
27 u32 id, long expires, u32 error);
28
29 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change, gfp_t flags,
30 u32 portid, const struct nlmsghdr *nlh);
31 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
32 gfp_t flags, int *new_nsid, int new_ifindex);
33 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
34 unsigned change, u32 event,
35 gfp_t flags, int *new_nsid,
36 int new_ifindex, u32 portid,
37 const struct nlmsghdr *nlh);
38 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev,
39 gfp_t flags, u32 portid, const struct nlmsghdr *nlh);
40
41
42 /* RTNL is used as a global lock for all changes to network configuration */
43 extern void rtnl_lock(void);
44 extern void rtnl_unlock(void);
45 extern int rtnl_trylock(void);
46 extern int rtnl_is_locked(void);
47 extern int rtnl_lock_killable(void);
48 extern bool refcount_dec_and_rtnl_lock(refcount_t *r);
49
50 DEFINE_LOCK_GUARD_0(rtnl, rtnl_lock(), rtnl_unlock())
51
52 extern wait_queue_head_t netdev_unregistering_wq;
53 extern atomic_t dev_unreg_count;
54 extern struct rw_semaphore pernet_ops_rwsem;
55 extern struct rw_semaphore net_rwsem;
56
57 #ifdef CONFIG_PROVE_LOCKING
58 extern bool lockdep_rtnl_is_held(void);
59 #else
lockdep_rtnl_is_held(void)60 static inline bool lockdep_rtnl_is_held(void)
61 {
62 return true;
63 }
64 #endif /* #ifdef CONFIG_PROVE_LOCKING */
65
66 /**
67 * rcu_dereference_rtnl - rcu_dereference with debug checking
68 * @p: The pointer to read, prior to dereferencing
69 *
70 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
71 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
72 */
73 #define rcu_dereference_rtnl(p) \
74 rcu_dereference_check(p, lockdep_rtnl_is_held())
75
76 /**
77 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
78 * @p: The pointer to read, prior to dereferencing
79 *
80 * Return the value of the specified RCU-protected pointer, but omit
81 * the READ_ONCE(), because caller holds RTNL.
82 */
83 #define rtnl_dereference(p) \
84 rcu_dereference_protected(p, lockdep_rtnl_is_held())
85
86 /**
87 * rcu_replace_pointer_rtnl - replace an RCU pointer under rtnl_lock, returning
88 * its old value
89 * @rp: RCU pointer, whose value is returned
90 * @p: regular pointer
91 *
92 * Perform a replacement under rtnl_lock, where @rp is an RCU-annotated
93 * pointer. The old value of @rp is returned, and @rp is set to @p
94 */
95 #define rcu_replace_pointer_rtnl(rp, p) \
96 rcu_replace_pointer(rp, p, lockdep_rtnl_is_held())
97
dev_ingress_queue(struct net_device * dev)98 static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
99 {
100 return rtnl_dereference(dev->ingress_queue);
101 }
102
dev_ingress_queue_rcu(struct net_device * dev)103 static inline struct netdev_queue *dev_ingress_queue_rcu(struct net_device *dev)
104 {
105 return rcu_dereference(dev->ingress_queue);
106 }
107
108 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
109
110 #ifdef CONFIG_NET_INGRESS
111 void net_inc_ingress_queue(void);
112 void net_dec_ingress_queue(void);
113 #endif
114
115 #ifdef CONFIG_NET_EGRESS
116 void net_inc_egress_queue(void);
117 void net_dec_egress_queue(void);
118 void netdev_xmit_skip_txqueue(bool skip);
119 #endif
120
121 void rtnetlink_init(void);
122 void __rtnl_unlock(void);
123 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail);
124
125 #define ASSERT_RTNL() \
126 WARN_ONCE(!rtnl_is_locked(), \
127 "RTNL: assertion failed at %s (%d)\n", __FILE__, __LINE__)
128
129 extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
130 struct netlink_callback *cb,
131 struct net_device *dev,
132 struct net_device *filter_dev,
133 int *idx);
134 extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
135 struct nlattr *tb[],
136 struct net_device *dev,
137 const unsigned char *addr,
138 u16 vid,
139 u16 flags);
140 extern int ndo_dflt_fdb_del(struct ndmsg *ndm,
141 struct nlattr *tb[],
142 struct net_device *dev,
143 const unsigned char *addr,
144 u16 vid);
145
146 extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
147 struct net_device *dev, u16 mode,
148 u32 flags, u32 mask, int nlflags,
149 u32 filter_mask,
150 int (*vlan_fill)(struct sk_buff *skb,
151 struct net_device *dev,
152 u32 filter_mask));
153
154 extern void rtnl_offload_xstats_notify(struct net_device *dev);
155
rtnl_has_listeners(const struct net * net,u32 group)156 static inline int rtnl_has_listeners(const struct net *net, u32 group)
157 {
158 struct sock *rtnl = net->rtnl;
159
160 return netlink_has_listeners(rtnl, group);
161 }
162
163 /**
164 * rtnl_notify_needed - check if notification is needed
165 * @net: Pointer to the net namespace
166 * @nlflags: netlink ingress message flags
167 * @group: rtnl group
168 *
169 * Based on the ingress message flags and rtnl group, returns true
170 * if a notification is needed, false otherwise.
171 */
172 static inline bool
rtnl_notify_needed(const struct net * net,u16 nlflags,u32 group)173 rtnl_notify_needed(const struct net *net, u16 nlflags, u32 group)
174 {
175 return (nlflags & NLM_F_ECHO) || rtnl_has_listeners(net, group);
176 }
177
178 void netdev_set_operstate(struct net_device *dev, int newstate);
179
180 #endif /* __LINUX_RTNETLINK_H */
181