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