tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Operations on the network namespace
3 */
4#ifndef __NET_NET_NAMESPACE_H
5#define __NET_NET_NAMESPACE_H
6
7#include <asm/atomic.h>
8#include <linux/workqueue.h>
9#include <linux/list.h>
10
11struct proc_dir_entry;
12struct net_device;
13struct net {
14 atomic_t count; /* To decided when the network
15 * namespace should be freed.
16 */
17 atomic_t use_count; /* To track references we
18 * destroy on demand
19 */
20 struct list_head list; /* list of network namespaces */
21 struct work_struct work; /* work struct for freeing */
22
23 struct proc_dir_entry *proc_net;
24 struct proc_dir_entry *proc_net_stat;
25 struct proc_dir_entry *proc_net_root;
26
27 struct net_device *loopback_dev; /* The loopback */
28
29 struct list_head dev_base_head;
30 struct hlist_head *dev_name_head;
31 struct hlist_head *dev_index_head;
32};
33
34#ifdef CONFIG_NET
35/* Init's network namespace */
36extern struct net init_net;
37#define INIT_NET_NS(net_ns) .net_ns = &init_net,
38#else
39#define INIT_NET_NS(net_ns)
40#endif
41
42extern struct list_head net_namespace_list;
43
44#ifdef CONFIG_NET
45extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
46#else
47static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
48{
49 /* There is nothing to copy so this is a noop */
50 return net_ns;
51}
52#endif
53
54extern void __put_net(struct net *net);
55
56static inline struct net *get_net(struct net *net)
57{
58#ifdef CONFIG_NET
59 atomic_inc(&net->count);
60#endif
61 return net;
62}
63
64static inline struct net *maybe_get_net(struct net *net)
65{
66 /* Used when we know struct net exists but we
67 * aren't guaranteed a previous reference count
68 * exists. If the reference count is zero this
69 * function fails and returns NULL.
70 */
71 if (!atomic_inc_not_zero(&net->count))
72 net = NULL;
73 return net;
74}
75
76static inline void put_net(struct net *net)
77{
78#ifdef CONFIG_NET
79 if (atomic_dec_and_test(&net->count))
80 __put_net(net);
81#endif
82}
83
84static inline struct net *hold_net(struct net *net)
85{
86#ifdef CONFIG_NET
87 atomic_inc(&net->use_count);
88#endif
89 return net;
90}
91
92static inline void release_net(struct net *net)
93{
94#ifdef CONFIG_NET
95 atomic_dec(&net->use_count);
96#endif
97}
98
99#define for_each_net(VAR) \
100 list_for_each_entry(VAR, &net_namespace_list, list)
101
102#ifdef CONFIG_NET_NS
103#define __net_init
104#define __net_exit
105#define __net_initdata
106#else
107#define __net_init __init
108#define __net_exit __exit_refok
109#define __net_initdata __initdata
110#endif
111
112struct pernet_operations {
113 struct list_head list;
114 int (*init)(struct net *net);
115 void (*exit)(struct net *net);
116};
117
118extern int register_pernet_subsys(struct pernet_operations *);
119extern void unregister_pernet_subsys(struct pernet_operations *);
120extern int register_pernet_device(struct pernet_operations *);
121extern void unregister_pernet_device(struct pernet_operations *);
122
123#endif /* __NET_NET_NAMESPACE_H */