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)
96 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
97 struct netns_nf_frag nf_frag;
100 struct sock *nfnl_stash;
102 #ifdef CONFIG_WEXT_CORE
103 struct sk_buff_head wext_nlevents;
105 struct net_generic __rcu *gen;
107 /* Note : following structs are cache line aligned */
109 struct netns_xfrm xfrm;
111 struct netns_ipvs *ipvs;
112 struct sock *diag_nlsk;
117 * ifindex generation is per-net namespace, and loopback is
118 * always the 1st device in ns (see net_dev_init), thus any
119 * loopback device should get ifindex 1
122 #define LOOPBACK_IFINDEX 1
124 #include <linux/seq_file_net.h>
126 /* Init's network namespace */
127 extern struct net init_net;
130 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
132 #else /* CONFIG_NET */
133 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
135 /* There is nothing to copy so this is a noop */
138 #endif /* CONFIG_NET */
141 extern struct list_head net_namespace_list;
143 extern struct net *get_net_ns_by_pid(pid_t pid);
144 extern struct net *get_net_ns_by_fd(int pid);
147 extern void __put_net(struct net *net);
149 static inline struct net *get_net(struct net *net)
151 atomic_inc(&net->count);
155 static inline struct net *maybe_get_net(struct net *net)
157 /* Used when we know struct net exists but we
158 * aren't guaranteed a previous reference count
159 * exists. If the reference count is zero this
160 * function fails and returns NULL.
162 if (!atomic_inc_not_zero(&net->count))
167 static inline void put_net(struct net *net)
169 if (atomic_dec_and_test(&net->count))
174 int net_eq(const struct net *net1, const struct net *net2)
179 extern void net_drop_ns(void *);
183 static inline struct net *get_net(struct net *net)
188 static inline void put_net(struct net *net)
192 static inline struct net *maybe_get_net(struct net *net)
198 int net_eq(const struct net *net1, const struct net *net2)
203 #define net_drop_ns NULL
207 #ifdef NETNS_REFCNT_DEBUG
208 static inline struct net *hold_net(struct net *net)
211 atomic_inc(&net->use_count);
215 static inline void release_net(struct net *net)
218 atomic_dec(&net->use_count);
221 static inline struct net *hold_net(struct net *net)
226 static inline void release_net(struct net *net)
233 static inline void write_pnet(struct net **pnet, struct net *net)
238 static inline struct net *read_pnet(struct net * const *pnet)
245 #define write_pnet(pnet, net) do { (void)(net);} while (0)
246 #define read_pnet(pnet) (&init_net)
250 #define for_each_net(VAR) \
251 list_for_each_entry(VAR, &net_namespace_list, list)
253 #define for_each_net_rcu(VAR) \
254 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
259 #define __net_initdata
260 #define __net_initconst
262 #define __net_init __init
263 #define __net_exit __exit_refok
264 #define __net_initdata __initdata
265 #define __net_initconst __initconst
268 struct pernet_operations {
269 struct list_head list;
270 int (*init)(struct net *net);
271 void (*exit)(struct net *net);
272 void (*exit_batch)(struct list_head *net_exit_list);
278 * Use these carefully. If you implement a network device and it
279 * needs per network namespace operations use device pernet operations,
280 * otherwise use pernet subsys operations.
282 * Network interfaces need to be removed from a dying netns _before_
283 * subsys notifiers can be called, as most of the network code cleanup
284 * (which is done from subsys notifiers) runs with the assumption that
285 * dev_remove_pack has been called so no new packets will arrive during
286 * and after the cleanup functions have been called. dev_remove_pack
287 * is not per namespace so instead the guarantee of no more packets
288 * arriving in a network namespace is provided by ensuring that all
289 * network devices and all sockets have left the network namespace
290 * before the cleanup methods are called.
292 * For the longest time the ipv4 icmp code was registered as a pernet
293 * device which caused kernel oops, and panics during network
294 * namespace cleanup. So please don't get this wrong.
296 extern int register_pernet_subsys(struct pernet_operations *);
297 extern void unregister_pernet_subsys(struct pernet_operations *);
298 extern int register_pernet_device(struct pernet_operations *);
299 extern void unregister_pernet_device(struct pernet_operations *);
302 struct ctl_table_header;
305 extern int net_sysctl_init(void);
306 extern struct ctl_table_header *register_net_sysctl(struct net *net,
307 const char *path, struct ctl_table *table);
308 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
310 static inline int net_sysctl_init(void) { return 0; }
311 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
312 const char *path, struct ctl_table *table)
316 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
321 static inline int rt_genid(struct net *net)
323 return atomic_read(&net->rt_genid);
326 static inline void rt_genid_bump(struct net *net)
328 atomic_inc(&net->rt_genid);
331 #endif /* __NET_NET_NAMESPACE_H */