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 #ifdef NETNS_REFCNT_DEBUG
53 atomic_t use_count; /* To track references we
57 spinlock_t rules_mod_lock;
59 struct list_head list; /* list of network namespaces */
60 struct list_head cleanup_list; /* namespaces on death row */
61 struct list_head exit_list; /* Use only net_mutex */
63 struct user_namespace *user_ns; /* Owning user namespace */
68 struct proc_dir_entry *proc_net;
69 struct proc_dir_entry *proc_net_stat;
72 struct ctl_table_set sysctls;
75 struct sock *rtnl; /* rtnetlink socket */
76 struct sock *genl_sock;
78 struct list_head dev_base_head;
79 struct hlist_head *dev_name_head;
80 struct hlist_head *dev_index_head;
81 unsigned int dev_base_seq; /* protected by rtnl_mutex */
83 unsigned int dev_unreg_count;
86 struct list_head rules_ops;
89 struct net_device *loopback_dev; /* The loopback */
90 struct netns_core core;
92 struct netns_packet packet;
93 struct netns_unix unx;
94 struct netns_ipv4 ipv4;
95 #if IS_ENABLED(CONFIG_IPV6)
96 struct netns_ipv6 ipv6;
98 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
99 struct netns_ieee802154_lowpan ieee802154_lowpan;
101 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
102 struct netns_sctp sctp;
104 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
105 struct netns_dccp dccp;
107 #ifdef CONFIG_NETFILTER
110 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
113 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
114 struct netns_nftables nft;
116 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
117 struct netns_nf_frag nf_frag;
120 struct sock *nfnl_stash;
122 #ifdef CONFIG_WEXT_CORE
123 struct sk_buff_head wext_nlevents;
125 struct net_generic __rcu *gen;
127 /* Note : following structs are cache line aligned */
129 struct netns_xfrm xfrm;
131 #if IS_ENABLED(CONFIG_IP_VS)
132 struct netns_ipvs *ipvs;
134 #if IS_ENABLED(CONFIG_MPLS)
135 struct netns_mpls mpls;
137 struct sock *diag_nlsk;
141 #include <linux/seq_file_net.h>
143 /* Init's network namespace */
144 extern struct net init_net;
147 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
148 struct net *old_net);
150 #else /* CONFIG_NET_NS */
151 #include <linux/sched.h>
152 #include <linux/nsproxy.h>
153 static inline struct net *copy_net_ns(unsigned long flags,
154 struct user_namespace *user_ns, struct net *old_net)
156 if (flags & CLONE_NEWNET)
157 return ERR_PTR(-EINVAL);
160 #endif /* CONFIG_NET_NS */
163 extern struct list_head net_namespace_list;
165 struct net *get_net_ns_by_pid(pid_t pid);
166 struct net *get_net_ns_by_fd(int pid);
169 void ipx_register_sysctl(void);
170 void ipx_unregister_sysctl(void);
172 #define ipx_register_sysctl()
173 #define ipx_unregister_sysctl()
177 void __put_net(struct net *net);
179 static inline struct net *get_net(struct net *net)
181 atomic_inc(&net->count);
185 static inline struct net *maybe_get_net(struct net *net)
187 /* Used when we know struct net exists but we
188 * aren't guaranteed a previous reference count
189 * exists. If the reference count is zero this
190 * function fails and returns NULL.
192 if (!atomic_inc_not_zero(&net->count))
197 static inline void put_net(struct net *net)
199 if (atomic_dec_and_test(&net->count))
204 int net_eq(const struct net *net1, const struct net *net2)
209 void net_drop_ns(void *);
213 static inline struct net *get_net(struct net *net)
218 static inline void put_net(struct net *net)
222 static inline struct net *maybe_get_net(struct net *net)
228 int net_eq(const struct net *net1, const struct net *net2)
233 #define net_drop_ns NULL
237 #ifdef NETNS_REFCNT_DEBUG
238 static inline struct net *hold_net(struct net *net)
241 atomic_inc(&net->use_count);
245 static inline void release_net(struct net *net)
248 atomic_dec(&net->use_count);
251 static inline struct net *hold_net(struct net *net)
256 static inline void release_net(struct net *net)
263 static inline void write_pnet(struct net **pnet, struct net *net)
268 static inline struct net *read_pnet(struct net * const *pnet)
275 #define write_pnet(pnet, net) do { (void)(net);} while (0)
276 #define read_pnet(pnet) (&init_net)
280 #define for_each_net(VAR) \
281 list_for_each_entry(VAR, &net_namespace_list, list)
283 #define for_each_net_rcu(VAR) \
284 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
289 #define __net_initdata
290 #define __net_initconst
292 #define __net_init __init
293 #define __net_exit __exit_refok
294 #define __net_initdata __initdata
295 #define __net_initconst __initconst
298 int peernet2id(struct net *net, struct net *peer);
299 struct net *get_net_ns_by_id(struct net *net, int id);
301 struct pernet_operations {
302 struct list_head list;
303 int (*init)(struct net *net);
304 void (*exit)(struct net *net);
305 void (*exit_batch)(struct list_head *net_exit_list);
311 * Use these carefully. If you implement a network device and it
312 * needs per network namespace operations use device pernet operations,
313 * otherwise use pernet subsys operations.
315 * Network interfaces need to be removed from a dying netns _before_
316 * subsys notifiers can be called, as most of the network code cleanup
317 * (which is done from subsys notifiers) runs with the assumption that
318 * dev_remove_pack has been called so no new packets will arrive during
319 * and after the cleanup functions have been called. dev_remove_pack
320 * is not per namespace so instead the guarantee of no more packets
321 * arriving in a network namespace is provided by ensuring that all
322 * network devices and all sockets have left the network namespace
323 * before the cleanup methods are called.
325 * For the longest time the ipv4 icmp code was registered as a pernet
326 * device which caused kernel oops, and panics during network
327 * namespace cleanup. So please don't get this wrong.
329 int register_pernet_subsys(struct pernet_operations *);
330 void unregister_pernet_subsys(struct pernet_operations *);
331 int register_pernet_device(struct pernet_operations *);
332 void unregister_pernet_device(struct pernet_operations *);
335 struct ctl_table_header;
338 int net_sysctl_init(void);
339 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
340 struct ctl_table *table);
341 void unregister_net_sysctl_table(struct ctl_table_header *header);
343 static inline int net_sysctl_init(void) { return 0; }
344 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
345 const char *path, struct ctl_table *table)
349 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
354 static inline int rt_genid_ipv4(struct net *net)
356 return atomic_read(&net->ipv4.rt_genid);
359 static inline void rt_genid_bump_ipv4(struct net *net)
361 atomic_inc(&net->ipv4.rt_genid);
364 extern void (*__fib6_flush_trees)(struct net *net);
365 static inline void rt_genid_bump_ipv6(struct net *net)
367 if (__fib6_flush_trees)
368 __fib6_flush_trees(net);
371 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
372 static inline struct netns_ieee802154_lowpan *
373 net_ieee802154_lowpan(struct net *net)
375 return &net->ieee802154_lowpan;
379 /* For callers who don't really care about whether it's IPv4 or IPv6 */
380 static inline void rt_genid_bump_all(struct net *net)
382 rt_genid_bump_ipv4(net);
383 rt_genid_bump_ipv6(net);
386 static inline int fnhe_genid(struct net *net)
388 return atomic_read(&net->fnhe_genid);
391 static inline void fnhe_genid_bump(struct net *net)
393 atomic_inc(&net->fnhe_genid);
396 #endif /* __NET_NET_NAMESPACE_H */