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/sctp.h>
19 #include <net/netns/dccp.h>
20 #include <net/netns/x_tables.h>
21 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
22 #include <net/netns/conntrack.h>
24 #include <net/netns/xfrm.h>
26 struct proc_dir_entry;
29 struct ctl_table_header;
35 #define NETDEV_HASHBITS 8
36 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
39 atomic_t passive; /* To decided when the network
40 * namespace should be freed.
42 atomic_t count; /* To decided when the network
43 * namespace should be shut down.
45 #ifdef NETNS_REFCNT_DEBUG
46 atomic_t use_count; /* To track references we
50 spinlock_t rules_mod_lock;
52 struct list_head list; /* list of network namespaces */
53 struct list_head cleanup_list; /* namespaces on death row */
54 struct list_head exit_list; /* Use only net_mutex */
56 struct proc_dir_entry *proc_net;
57 struct proc_dir_entry *proc_net_stat;
60 struct ctl_table_set sysctls;
63 struct sock *rtnl; /* rtnetlink socket */
64 struct sock *genl_sock;
66 struct list_head dev_base_head;
67 struct hlist_head *dev_name_head;
68 struct hlist_head *dev_index_head;
69 unsigned int dev_base_seq; /* protected by rtnl_mutex */
73 struct list_head rules_ops;
76 struct net_device *loopback_dev; /* The loopback */
77 struct netns_core core;
79 struct netns_packet packet;
80 struct netns_unix unx;
81 struct netns_ipv4 ipv4;
82 #if IS_ENABLED(CONFIG_IPV6)
83 struct netns_ipv6 ipv6;
85 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
86 struct netns_sctp sctp;
88 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
89 struct netns_dccp dccp;
91 #ifdef CONFIG_NETFILTER
93 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
97 struct sock *nfnl_stash;
99 #ifdef CONFIG_WEXT_CORE
100 struct sk_buff_head wext_nlevents;
102 struct net_generic __rcu *gen;
104 /* Note : following structs are cache line aligned */
106 struct netns_xfrm xfrm;
108 struct netns_ipvs *ipvs;
109 struct sock *diag_nlsk;
113 * ifindex generation is per-net namespace, and loopback is
114 * always the 1st device in ns (see net_dev_init), thus any
115 * loopback device should get ifindex 1
118 #define LOOPBACK_IFINDEX 1
120 #include <linux/seq_file_net.h>
122 /* Init's network namespace */
123 extern struct net init_net;
126 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
128 #else /* CONFIG_NET */
129 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
131 /* There is nothing to copy so this is a noop */
134 #endif /* CONFIG_NET */
137 extern struct list_head net_namespace_list;
139 extern struct net *get_net_ns_by_pid(pid_t pid);
140 extern struct net *get_net_ns_by_fd(int pid);
143 extern void __put_net(struct net *net);
145 static inline struct net *get_net(struct net *net)
147 atomic_inc(&net->count);
151 static inline struct net *maybe_get_net(struct net *net)
153 /* Used when we know struct net exists but we
154 * aren't guaranteed a previous reference count
155 * exists. If the reference count is zero this
156 * function fails and returns NULL.
158 if (!atomic_inc_not_zero(&net->count))
163 static inline void put_net(struct net *net)
165 if (atomic_dec_and_test(&net->count))
170 int net_eq(const struct net *net1, const struct net *net2)
175 extern void net_drop_ns(void *);
179 static inline struct net *get_net(struct net *net)
184 static inline void put_net(struct net *net)
188 static inline struct net *maybe_get_net(struct net *net)
194 int net_eq(const struct net *net1, const struct net *net2)
199 #define net_drop_ns NULL
203 #ifdef NETNS_REFCNT_DEBUG
204 static inline struct net *hold_net(struct net *net)
207 atomic_inc(&net->use_count);
211 static inline void release_net(struct net *net)
214 atomic_dec(&net->use_count);
217 static inline struct net *hold_net(struct net *net)
222 static inline void release_net(struct net *net)
229 static inline void write_pnet(struct net **pnet, struct net *net)
234 static inline struct net *read_pnet(struct net * const *pnet)
241 #define write_pnet(pnet, net) do { (void)(net);} while (0)
242 #define read_pnet(pnet) (&init_net)
246 #define for_each_net(VAR) \
247 list_for_each_entry(VAR, &net_namespace_list, list)
249 #define for_each_net_rcu(VAR) \
250 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
255 #define __net_initdata
257 #define __net_init __init
258 #define __net_exit __exit_refok
259 #define __net_initdata __initdata
262 struct pernet_operations {
263 struct list_head list;
264 int (*init)(struct net *net);
265 void (*exit)(struct net *net);
266 void (*exit_batch)(struct list_head *net_exit_list);
272 * Use these carefully. If you implement a network device and it
273 * needs per network namespace operations use device pernet operations,
274 * otherwise use pernet subsys operations.
276 * Network interfaces need to be removed from a dying netns _before_
277 * subsys notifiers can be called, as most of the network code cleanup
278 * (which is done from subsys notifiers) runs with the assumption that
279 * dev_remove_pack has been called so no new packets will arrive during
280 * and after the cleanup functions have been called. dev_remove_pack
281 * is not per namespace so instead the guarantee of no more packets
282 * arriving in a network namespace is provided by ensuring that all
283 * network devices and all sockets have left the network namespace
284 * before the cleanup methods are called.
286 * For the longest time the ipv4 icmp code was registered as a pernet
287 * device which caused kernel oops, and panics during network
288 * namespace cleanup. So please don't get this wrong.
290 extern int register_pernet_subsys(struct pernet_operations *);
291 extern void unregister_pernet_subsys(struct pernet_operations *);
292 extern int register_pernet_device(struct pernet_operations *);
293 extern void unregister_pernet_device(struct pernet_operations *);
296 struct ctl_table_header;
299 extern int net_sysctl_init(void);
300 extern struct ctl_table_header *register_net_sysctl(struct net *net,
301 const char *path, struct ctl_table *table);
302 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
304 static inline int net_sysctl_init(void) { return 0; }
305 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
306 const char *path, struct ctl_table *table)
310 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
316 #endif /* __NET_NET_NAMESPACE_H */