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;
108 #include <linux/seq_file_net.h>
110 /* Init's network namespace */
111 extern struct net init_net;
114 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
116 #else /* CONFIG_NET */
117 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
119 /* There is nothing to copy so this is a noop */
122 #endif /* CONFIG_NET */
125 extern struct list_head net_namespace_list;
127 extern struct net *get_net_ns_by_pid(pid_t pid);
128 extern struct net *get_net_ns_by_fd(int pid);
131 extern void __put_net(struct net *net);
133 static inline struct net *get_net(struct net *net)
135 atomic_inc(&net->count);
139 static inline struct net *maybe_get_net(struct net *net)
141 /* Used when we know struct net exists but we
142 * aren't guaranteed a previous reference count
143 * exists. If the reference count is zero this
144 * function fails and returns NULL.
146 if (!atomic_inc_not_zero(&net->count))
151 static inline void put_net(struct net *net)
153 if (atomic_dec_and_test(&net->count))
158 int net_eq(const struct net *net1, const struct net *net2)
163 extern void net_drop_ns(void *);
167 static inline struct net *get_net(struct net *net)
172 static inline void put_net(struct net *net)
176 static inline struct net *maybe_get_net(struct net *net)
182 int net_eq(const struct net *net1, const struct net *net2)
187 #define net_drop_ns NULL
191 #ifdef NETNS_REFCNT_DEBUG
192 static inline struct net *hold_net(struct net *net)
195 atomic_inc(&net->use_count);
199 static inline void release_net(struct net *net)
202 atomic_dec(&net->use_count);
205 static inline struct net *hold_net(struct net *net)
210 static inline void release_net(struct net *net)
217 static inline void write_pnet(struct net **pnet, struct net *net)
222 static inline struct net *read_pnet(struct net * const *pnet)
229 #define write_pnet(pnet, net) do { (void)(net);} while (0)
230 #define read_pnet(pnet) (&init_net)
234 #define for_each_net(VAR) \
235 list_for_each_entry(VAR, &net_namespace_list, list)
237 #define for_each_net_rcu(VAR) \
238 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
243 #define __net_initdata
245 #define __net_init __init
246 #define __net_exit __exit_refok
247 #define __net_initdata __initdata
250 struct pernet_operations {
251 struct list_head list;
252 int (*init)(struct net *net);
253 void (*exit)(struct net *net);
254 void (*exit_batch)(struct list_head *net_exit_list);
260 * Use these carefully. If you implement a network device and it
261 * needs per network namespace operations use device pernet operations,
262 * otherwise use pernet subsys operations.
264 * Network interfaces need to be removed from a dying netns _before_
265 * subsys notifiers can be called, as most of the network code cleanup
266 * (which is done from subsys notifiers) runs with the assumption that
267 * dev_remove_pack has been called so no new packets will arrive during
268 * and after the cleanup functions have been called. dev_remove_pack
269 * is not per namespace so instead the guarantee of no more packets
270 * arriving in a network namespace is provided by ensuring that all
271 * network devices and all sockets have left the network namespace
272 * before the cleanup methods are called.
274 * For the longest time the ipv4 icmp code was registered as a pernet
275 * device which caused kernel oops, and panics during network
276 * namespace cleanup. So please don't get this wrong.
278 extern int register_pernet_subsys(struct pernet_operations *);
279 extern void unregister_pernet_subsys(struct pernet_operations *);
280 extern int register_pernet_device(struct pernet_operations *);
281 extern void unregister_pernet_device(struct pernet_operations *);
284 struct ctl_table_header;
287 extern int net_sysctl_init(void);
288 extern struct ctl_table_header *register_net_sysctl(struct net *net,
289 const char *path, struct ctl_table *table);
290 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
292 static inline int net_sysctl_init(void) { return 0; }
293 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
294 const char *path, struct ctl_table *table)
298 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
304 #endif /* __NET_NET_NAMESPACE_H */