2 * Operations on the network namespace
4 #ifndef __NET_NET_NAMESPACE_H
5 #define __NET_NET_NAMESPACE_H
7 #include <linux/atomic.h>
8 #include <linux/workqueue.h>
9 #include <linux/list.h>
10 #include <linux/sysctl.h>
12 #include <net/netns/core.h>
13 #include <net/netns/mib.h>
14 #include <net/netns/unix.h>
15 #include <net/netns/packet.h>
16 #include <net/netns/ipv4.h>
17 #include <net/netns/ipv6.h>
18 #include <net/netns/dccp.h>
19 #include <net/netns/x_tables.h>
20 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
21 #include <net/netns/conntrack.h>
23 #include <net/netns/xfrm.h>
25 struct proc_dir_entry;
28 struct ctl_table_header;
34 #define NETDEV_HASHBITS 8
35 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
38 atomic_t passive; /* To decided when the network
39 * namespace should be freed.
41 atomic_t count; /* To decided when the network
42 * namespace should be shut down.
44 #ifdef NETNS_REFCNT_DEBUG
45 atomic_t use_count; /* To track references we
49 spinlock_t rules_mod_lock;
51 struct list_head list; /* list of network namespaces */
52 struct list_head cleanup_list; /* namespaces on death row */
53 struct list_head exit_list; /* Use only net_mutex */
55 struct proc_dir_entry *proc_net;
56 struct proc_dir_entry *proc_net_stat;
59 struct ctl_table_set sysctls;
62 struct sock *rtnl; /* rtnetlink socket */
63 struct sock *genl_sock;
65 struct list_head dev_base_head;
66 struct hlist_head *dev_name_head;
67 struct hlist_head *dev_index_head;
68 unsigned int dev_base_seq; /* protected by rtnl_mutex */
71 struct list_head rules_ops;
74 struct net_device *loopback_dev; /* The loopback */
75 struct netns_core core;
77 struct netns_packet packet;
78 struct netns_unix unx;
79 struct netns_ipv4 ipv4;
80 #if IS_ENABLED(CONFIG_IPV6)
81 struct netns_ipv6 ipv6;
83 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
84 struct netns_dccp dccp;
86 #ifdef CONFIG_NETFILTER
88 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
92 struct sock *nfnl_stash;
94 #ifdef CONFIG_WEXT_CORE
95 struct sk_buff_head wext_nlevents;
97 struct net_generic __rcu *gen;
99 /* Note : following structs are cache line aligned */
101 struct netns_xfrm xfrm;
103 struct netns_ipvs *ipvs;
104 struct sock *diag_nlsk;
109 #include <linux/seq_file_net.h>
111 /* Init's network namespace */
112 extern struct net init_net;
115 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
117 #else /* CONFIG_NET */
118 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
120 /* There is nothing to copy so this is a noop */
123 #endif /* CONFIG_NET */
126 extern struct list_head net_namespace_list;
128 extern struct net *get_net_ns_by_pid(pid_t pid);
129 extern struct net *get_net_ns_by_fd(int pid);
132 extern void __put_net(struct net *net);
134 static inline struct net *get_net(struct net *net)
136 atomic_inc(&net->count);
140 static inline struct net *maybe_get_net(struct net *net)
142 /* Used when we know struct net exists but we
143 * aren't guaranteed a previous reference count
144 * exists. If the reference count is zero this
145 * function fails and returns NULL.
147 if (!atomic_inc_not_zero(&net->count))
152 static inline void put_net(struct net *net)
154 if (atomic_dec_and_test(&net->count))
159 int net_eq(const struct net *net1, const struct net *net2)
164 extern void net_drop_ns(void *);
168 static inline struct net *get_net(struct net *net)
173 static inline void put_net(struct net *net)
177 static inline struct net *maybe_get_net(struct net *net)
183 int net_eq(const struct net *net1, const struct net *net2)
188 #define net_drop_ns NULL
192 #ifdef NETNS_REFCNT_DEBUG
193 static inline struct net *hold_net(struct net *net)
196 atomic_inc(&net->use_count);
200 static inline void release_net(struct net *net)
203 atomic_dec(&net->use_count);
206 static inline struct net *hold_net(struct net *net)
211 static inline void release_net(struct net *net)
218 static inline void write_pnet(struct net **pnet, struct net *net)
223 static inline struct net *read_pnet(struct net * const *pnet)
230 #define write_pnet(pnet, net) do { (void)(net);} while (0)
231 #define read_pnet(pnet) (&init_net)
235 #define for_each_net(VAR) \
236 list_for_each_entry(VAR, &net_namespace_list, list)
238 #define for_each_net_rcu(VAR) \
239 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
244 #define __net_initdata
246 #define __net_init __init
247 #define __net_exit __exit_refok
248 #define __net_initdata __initdata
251 struct pernet_operations {
252 struct list_head list;
253 int (*init)(struct net *net);
254 void (*exit)(struct net *net);
255 void (*exit_batch)(struct list_head *net_exit_list);
261 * Use these carefully. If you implement a network device and it
262 * needs per network namespace operations use device pernet operations,
263 * otherwise use pernet subsys operations.
265 * Network interfaces need to be removed from a dying netns _before_
266 * subsys notifiers can be called, as most of the network code cleanup
267 * (which is done from subsys notifiers) runs with the assumption that
268 * dev_remove_pack has been called so no new packets will arrive during
269 * and after the cleanup functions have been called. dev_remove_pack
270 * is not per namespace so instead the guarantee of no more packets
271 * arriving in a network namespace is provided by ensuring that all
272 * network devices and all sockets have left the network namespace
273 * before the cleanup methods are called.
275 * For the longest time the ipv4 icmp code was registered as a pernet
276 * device which caused kernel oops, and panics during network
277 * namespace cleanup. So please don't get this wrong.
279 extern int register_pernet_subsys(struct pernet_operations *);
280 extern void unregister_pernet_subsys(struct pernet_operations *);
281 extern int register_pernet_device(struct pernet_operations *);
282 extern void unregister_pernet_device(struct pernet_operations *);
285 struct ctl_table_header;
288 extern int net_sysctl_init(void);
289 extern struct ctl_table_header *register_net_sysctl(struct net *net,
290 const char *path, struct ctl_table *table);
291 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
293 static inline int net_sysctl_init(void) { return 0; }
294 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
295 const char *path, struct ctl_table *table)
299 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
304 static inline int rt_genid(struct net *net)
306 return atomic_read(&net->rt_genid);
309 static inline void rt_genid_bump(struct net *net)
311 atomic_inc(&net->rt_genid);
314 #endif /* __NET_NET_NAMESPACE_H */