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Commit | Line | Data |
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5f256bec EB |
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 | ||
a0a53c8b DL |
11 | #include <net/netns/unix.h> |
12 | ||
457c4cbc | 13 | struct proc_dir_entry; |
2774c7ab | 14 | struct net_device; |
97c53cac | 15 | struct sock; |
1597fbc0 PE |
16 | struct ctl_table_header; |
17 | ||
5f256bec EB |
18 | struct net { |
19 | atomic_t count; /* To decided when the network | |
20 | * namespace should be freed. | |
21 | */ | |
22 | atomic_t use_count; /* To track references we | |
23 | * destroy on demand | |
24 | */ | |
25 | struct list_head list; /* list of network namespaces */ | |
26 | struct work_struct work; /* work struct for freeing */ | |
457c4cbc EB |
27 | |
28 | struct proc_dir_entry *proc_net; | |
29 | struct proc_dir_entry *proc_net_stat; | |
30 | struct proc_dir_entry *proc_net_root; | |
881d966b | 31 | |
95bdfccb EB |
32 | struct list_head sysctl_table_headers; |
33 | ||
2774c7ab EB |
34 | struct net_device *loopback_dev; /* The loopback */ |
35 | ||
881d966b EB |
36 | struct list_head dev_base_head; |
37 | struct hlist_head *dev_name_head; | |
38 | struct hlist_head *dev_index_head; | |
97c53cac DL |
39 | |
40 | struct sock *rtnl; /* rtnetlink socket */ | |
d12d01d6 | 41 | |
024626e3 PE |
42 | /* core sysctls */ |
43 | struct ctl_table_header *sysctl_core_hdr; | |
b8e1f9b5 | 44 | int sysctl_somaxconn; |
024626e3 | 45 | |
d12d01d6 DL |
46 | /* List of all packet sockets. */ |
47 | rwlock_t packet_sklist_lock; | |
48 | struct hlist_head packet_sklist; | |
d392e497 | 49 | |
a0a53c8b | 50 | struct netns_unix unx; |
5f256bec EB |
51 | }; |
52 | ||
4fabcd71 DL |
53 | #ifdef CONFIG_NET |
54 | /* Init's network namespace */ | |
5f256bec | 55 | extern struct net init_net; |
4fabcd71 DL |
56 | #define INIT_NET_NS(net_ns) .net_ns = &init_net, |
57 | #else | |
58 | #define INIT_NET_NS(net_ns) | |
59 | #endif | |
60 | ||
5f256bec EB |
61 | extern struct list_head net_namespace_list; |
62 | ||
9dd776b6 EB |
63 | #ifdef CONFIG_NET |
64 | extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); | |
65 | #else | |
66 | static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) | |
67 | { | |
68 | /* There is nothing to copy so this is a noop */ | |
69 | return net_ns; | |
70 | } | |
71 | #endif | |
72 | ||
d4655795 | 73 | #ifdef CONFIG_NET_NS |
5f256bec EB |
74 | extern void __put_net(struct net *net); |
75 | ||
76 | static inline struct net *get_net(struct net *net) | |
77 | { | |
78 | atomic_inc(&net->count); | |
79 | return net; | |
80 | } | |
81 | ||
077130c0 EB |
82 | static inline struct net *maybe_get_net(struct net *net) |
83 | { | |
84 | /* Used when we know struct net exists but we | |
85 | * aren't guaranteed a previous reference count | |
86 | * exists. If the reference count is zero this | |
87 | * function fails and returns NULL. | |
88 | */ | |
89 | if (!atomic_inc_not_zero(&net->count)) | |
90 | net = NULL; | |
91 | return net; | |
92 | } | |
93 | ||
5f256bec EB |
94 | static inline void put_net(struct net *net) |
95 | { | |
96 | if (atomic_dec_and_test(&net->count)) | |
97 | __put_net(net); | |
98 | } | |
99 | ||
100 | static inline struct net *hold_net(struct net *net) | |
101 | { | |
102 | atomic_inc(&net->use_count); | |
103 | return net; | |
104 | } | |
105 | ||
106 | static inline void release_net(struct net *net) | |
107 | { | |
108 | atomic_dec(&net->use_count); | |
109 | } | |
d4655795 PE |
110 | #else |
111 | static inline struct net *get_net(struct net *net) | |
112 | { | |
113 | return net; | |
114 | } | |
115 | ||
116 | static inline void put_net(struct net *net) | |
117 | { | |
118 | } | |
119 | ||
120 | static inline struct net *hold_net(struct net *net) | |
121 | { | |
122 | return net; | |
123 | } | |
124 | ||
125 | static inline void release_net(struct net *net) | |
126 | { | |
127 | } | |
128 | ||
129 | static inline struct net *maybe_get_net(struct net *net) | |
130 | { | |
131 | return net; | |
132 | } | |
133 | #endif | |
5f256bec | 134 | |
5f256bec EB |
135 | #define for_each_net(VAR) \ |
136 | list_for_each_entry(VAR, &net_namespace_list, list) | |
137 | ||
4665079c PE |
138 | #ifdef CONFIG_NET_NS |
139 | #define __net_init | |
140 | #define __net_exit | |
022cbae6 | 141 | #define __net_initdata |
4665079c PE |
142 | #else |
143 | #define __net_init __init | |
144 | #define __net_exit __exit_refok | |
022cbae6 | 145 | #define __net_initdata __initdata |
4665079c | 146 | #endif |
5f256bec EB |
147 | |
148 | struct pernet_operations { | |
149 | struct list_head list; | |
150 | int (*init)(struct net *net); | |
151 | void (*exit)(struct net *net); | |
152 | }; | |
153 | ||
154 | extern int register_pernet_subsys(struct pernet_operations *); | |
155 | extern void unregister_pernet_subsys(struct pernet_operations *); | |
156 | extern int register_pernet_device(struct pernet_operations *); | |
157 | extern void unregister_pernet_device(struct pernet_operations *); | |
158 | ||
95bdfccb EB |
159 | struct ctl_path; |
160 | struct ctl_table; | |
161 | struct ctl_table_header; | |
162 | extern struct ctl_table_header *register_net_sysctl_table(struct net *net, | |
163 | const struct ctl_path *path, struct ctl_table *table); | |
164 | extern void unregister_net_sysctl_table(struct ctl_table_header *header); | |
165 | ||
5f256bec | 166 | #endif /* __NET_NET_NAMESPACE_H */ |