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>
13 #include <net/netns/core.h>
14 #include <net/netns/mib.h>
15 #include <net/netns/unix.h>
16 #include <net/netns/packet.h>
17 #include <net/netns/ipv4.h>
18 #include <net/netns/ipv6.h>
19 #include <net/netns/ieee802154_6lowpan.h>
20 #include <net/netns/sctp.h>
21 #include <net/netns/dccp.h>
22 #include <net/netns/netfilter.h>
23 #include <net/netns/x_tables.h>
24 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
25 #include <net/netns/conntrack.h>
27 #include <net/netns/nftables.h>
28 #include <net/netns/xfrm.h>
29 #include <net/netns/mpls.h>
30 #include <linux/ns_common.h>
32 struct user_namespace;
33 struct proc_dir_entry;
36 struct ctl_table_header;
42 #define NETDEV_HASHBITS 8
43 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
46 atomic_t passive; /* To decided when the network
47 * namespace should be freed.
49 atomic_t count; /* To decided when the network
50 * namespace should be shut down.
52 spinlock_t rules_mod_lock;
54 atomic64_t cookie_gen;
56 struct list_head list; /* list of network namespaces */
57 struct list_head cleanup_list; /* namespaces on death row */
58 struct list_head exit_list; /* Use only net_mutex */
60 struct user_namespace *user_ns; /* Owning user namespace */
65 struct proc_dir_entry *proc_net;
66 struct proc_dir_entry *proc_net_stat;
69 struct ctl_table_set sysctls;
72 struct sock *rtnl; /* rtnetlink socket */
73 struct sock *genl_sock;
75 struct list_head dev_base_head;
76 struct hlist_head *dev_name_head;
77 struct hlist_head *dev_index_head;
78 unsigned int dev_base_seq; /* protected by rtnl_mutex */
80 unsigned int dev_unreg_count;
83 struct list_head rules_ops;
86 struct net_device *loopback_dev; /* The loopback */
87 struct netns_core core;
89 struct netns_packet packet;
90 struct netns_unix unx;
91 struct netns_ipv4 ipv4;
92 #if IS_ENABLED(CONFIG_IPV6)
93 struct netns_ipv6 ipv6;
95 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
96 struct netns_ieee802154_lowpan ieee802154_lowpan;
98 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
99 struct netns_sctp sctp;
101 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
102 struct netns_dccp dccp;
104 #ifdef CONFIG_NETFILTER
107 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
110 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
111 struct netns_nftables nft;
113 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
114 struct netns_nf_frag nf_frag;
117 struct sock *nfnl_stash;
119 #ifdef CONFIG_WEXT_CORE
120 struct sk_buff_head wext_nlevents;
122 struct net_generic __rcu *gen;
124 /* Note : following structs are cache line aligned */
126 struct netns_xfrm xfrm;
128 #if IS_ENABLED(CONFIG_IP_VS)
129 struct netns_ipvs *ipvs;
131 #if IS_ENABLED(CONFIG_MPLS)
132 struct netns_mpls mpls;
134 struct sock *diag_nlsk;
138 #include <linux/seq_file_net.h>
140 /* Init's network namespace */
141 extern struct net init_net;
144 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
145 struct net *old_net);
147 #else /* CONFIG_NET_NS */
148 #include <linux/sched.h>
149 #include <linux/nsproxy.h>
150 static inline struct net *copy_net_ns(unsigned long flags,
151 struct user_namespace *user_ns, struct net *old_net)
153 if (flags & CLONE_NEWNET)
154 return ERR_PTR(-EINVAL);
157 #endif /* CONFIG_NET_NS */
160 extern struct list_head net_namespace_list;
162 struct net *get_net_ns_by_pid(pid_t pid);
163 struct net *get_net_ns_by_fd(int pid);
166 void ipx_register_sysctl(void);
167 void ipx_unregister_sysctl(void);
169 #define ipx_register_sysctl()
170 #define ipx_unregister_sysctl()
174 void __put_net(struct net *net);
176 static inline struct net *get_net(struct net *net)
178 atomic_inc(&net->count);
182 static inline struct net *maybe_get_net(struct net *net)
184 /* Used when we know struct net exists but we
185 * aren't guaranteed a previous reference count
186 * exists. If the reference count is zero this
187 * function fails and returns NULL.
189 if (!atomic_inc_not_zero(&net->count))
194 static inline void put_net(struct net *net)
196 if (atomic_dec_and_test(&net->count))
201 int net_eq(const struct net *net1, const struct net *net2)
206 void net_drop_ns(void *);
210 static inline struct net *get_net(struct net *net)
215 static inline void put_net(struct net *net)
219 static inline struct net *maybe_get_net(struct net *net)
225 int net_eq(const struct net *net1, const struct net *net2)
230 #define net_drop_ns NULL
240 static inline void write_pnet(possible_net_t *pnet, struct net *net)
247 static inline struct net *read_pnet(const possible_net_t *pnet)
256 #define for_each_net(VAR) \
257 list_for_each_entry(VAR, &net_namespace_list, list)
259 #define for_each_net_rcu(VAR) \
260 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
265 #define __net_initdata
266 #define __net_initconst
268 #define __net_init __init
269 #define __net_exit __exit_refok
270 #define __net_initdata __initdata
271 #define __net_initconst __initconst
274 int peernet2id(struct net *net, struct net *peer);
275 struct net *get_net_ns_by_id(struct net *net, int id);
277 struct pernet_operations {
278 struct list_head list;
279 int (*init)(struct net *net);
280 void (*exit)(struct net *net);
281 void (*exit_batch)(struct list_head *net_exit_list);
287 * Use these carefully. If you implement a network device and it
288 * needs per network namespace operations use device pernet operations,
289 * otherwise use pernet subsys operations.
291 * Network interfaces need to be removed from a dying netns _before_
292 * subsys notifiers can be called, as most of the network code cleanup
293 * (which is done from subsys notifiers) runs with the assumption that
294 * dev_remove_pack has been called so no new packets will arrive during
295 * and after the cleanup functions have been called. dev_remove_pack
296 * is not per namespace so instead the guarantee of no more packets
297 * arriving in a network namespace is provided by ensuring that all
298 * network devices and all sockets have left the network namespace
299 * before the cleanup methods are called.
301 * For the longest time the ipv4 icmp code was registered as a pernet
302 * device which caused kernel oops, and panics during network
303 * namespace cleanup. So please don't get this wrong.
305 int register_pernet_subsys(struct pernet_operations *);
306 void unregister_pernet_subsys(struct pernet_operations *);
307 int register_pernet_device(struct pernet_operations *);
308 void unregister_pernet_device(struct pernet_operations *);
311 struct ctl_table_header;
314 int net_sysctl_init(void);
315 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
316 struct ctl_table *table);
317 void unregister_net_sysctl_table(struct ctl_table_header *header);
319 static inline int net_sysctl_init(void) { return 0; }
320 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
321 const char *path, struct ctl_table *table)
325 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
330 static inline int rt_genid_ipv4(struct net *net)
332 return atomic_read(&net->ipv4.rt_genid);
335 static inline void rt_genid_bump_ipv4(struct net *net)
337 atomic_inc(&net->ipv4.rt_genid);
340 extern void (*__fib6_flush_trees)(struct net *net);
341 static inline void rt_genid_bump_ipv6(struct net *net)
343 if (__fib6_flush_trees)
344 __fib6_flush_trees(net);
347 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
348 static inline struct netns_ieee802154_lowpan *
349 net_ieee802154_lowpan(struct net *net)
351 return &net->ieee802154_lowpan;
355 /* For callers who don't really care about whether it's IPv4 or IPv6 */
356 static inline void rt_genid_bump_all(struct net *net)
358 rt_genid_bump_ipv4(net);
359 rt_genid_bump_ipv6(net);
362 static inline int fnhe_genid(struct net *net)
364 return atomic_read(&net->fnhe_genid);
367 static inline void fnhe_genid_bump(struct net *net)
369 atomic_inc(&net->fnhe_genid);
372 #endif /* __NET_NET_NAMESPACE_H */