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 <linux/ns_common.h>
31 struct user_namespace;
32 struct proc_dir_entry;
35 struct ctl_table_header;
41 #define NETDEV_HASHBITS 8
42 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
45 atomic_t passive; /* To decided when the network
46 * namespace should be freed.
48 atomic_t count; /* To decided when the network
49 * namespace should be shut down.
51 #ifdef NETNS_REFCNT_DEBUG
52 atomic_t use_count; /* To track references we
56 spinlock_t rules_mod_lock;
58 struct list_head list; /* list of network namespaces */
59 struct list_head cleanup_list; /* namespaces on death row */
60 struct list_head exit_list; /* Use only net_mutex */
62 struct user_namespace *user_ns; /* Owning user namespace */
66 struct proc_dir_entry *proc_net;
67 struct proc_dir_entry *proc_net_stat;
70 struct ctl_table_set sysctls;
73 struct sock *rtnl; /* rtnetlink socket */
74 struct sock *genl_sock;
76 struct list_head dev_base_head;
77 struct hlist_head *dev_name_head;
78 struct hlist_head *dev_index_head;
79 unsigned int dev_base_seq; /* protected by rtnl_mutex */
81 unsigned int dev_unreg_count;
84 struct list_head rules_ops;
87 struct net_device *loopback_dev; /* The loopback */
88 struct netns_core core;
90 struct netns_packet packet;
91 struct netns_unix unx;
92 struct netns_ipv4 ipv4;
93 #if IS_ENABLED(CONFIG_IPV6)
94 struct netns_ipv6 ipv6;
96 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
97 struct netns_ieee802154_lowpan ieee802154_lowpan;
99 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
100 struct netns_sctp sctp;
102 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
103 struct netns_dccp dccp;
105 #ifdef CONFIG_NETFILTER
108 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
111 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
112 struct netns_nftables nft;
114 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
115 struct netns_nf_frag nf_frag;
118 struct sock *nfnl_stash;
120 #ifdef CONFIG_WEXT_CORE
121 struct sk_buff_head wext_nlevents;
123 struct net_generic __rcu *gen;
125 /* Note : following structs are cache line aligned */
127 struct netns_xfrm xfrm;
129 #if IS_ENABLED(CONFIG_IP_VS)
130 struct netns_ipvs *ipvs;
132 struct sock *diag_nlsk;
136 #include <linux/seq_file_net.h>
138 /* Init's network namespace */
139 extern struct net init_net;
142 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
143 struct net *old_net);
145 #else /* CONFIG_NET_NS */
146 #include <linux/sched.h>
147 #include <linux/nsproxy.h>
148 static inline struct net *copy_net_ns(unsigned long flags,
149 struct user_namespace *user_ns, struct net *old_net)
151 if (flags & CLONE_NEWNET)
152 return ERR_PTR(-EINVAL);
155 #endif /* CONFIG_NET_NS */
158 extern struct list_head net_namespace_list;
160 struct net *get_net_ns_by_pid(pid_t pid);
161 struct net *get_net_ns_by_fd(int pid);
164 void ipx_register_sysctl(void);
165 void ipx_unregister_sysctl(void);
167 #define ipx_register_sysctl()
168 #define ipx_unregister_sysctl()
172 void __put_net(struct net *net);
174 static inline struct net *get_net(struct net *net)
176 atomic_inc(&net->count);
180 static inline struct net *maybe_get_net(struct net *net)
182 /* Used when we know struct net exists but we
183 * aren't guaranteed a previous reference count
184 * exists. If the reference count is zero this
185 * function fails and returns NULL.
187 if (!atomic_inc_not_zero(&net->count))
192 static inline void put_net(struct net *net)
194 if (atomic_dec_and_test(&net->count))
199 int net_eq(const struct net *net1, const struct net *net2)
204 void net_drop_ns(void *);
208 static inline struct net *get_net(struct net *net)
213 static inline void put_net(struct net *net)
217 static inline struct net *maybe_get_net(struct net *net)
223 int net_eq(const struct net *net1, const struct net *net2)
228 #define net_drop_ns NULL
232 #ifdef NETNS_REFCNT_DEBUG
233 static inline struct net *hold_net(struct net *net)
236 atomic_inc(&net->use_count);
240 static inline void release_net(struct net *net)
243 atomic_dec(&net->use_count);
246 static inline struct net *hold_net(struct net *net)
251 static inline void release_net(struct net *net)
258 static inline void write_pnet(struct net **pnet, struct net *net)
263 static inline struct net *read_pnet(struct net * const *pnet)
270 #define write_pnet(pnet, net) do { (void)(net);} while (0)
271 #define read_pnet(pnet) (&init_net)
275 #define for_each_net(VAR) \
276 list_for_each_entry(VAR, &net_namespace_list, list)
278 #define for_each_net_rcu(VAR) \
279 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
284 #define __net_initdata
285 #define __net_initconst
287 #define __net_init __init
288 #define __net_exit __exit_refok
289 #define __net_initdata __initdata
290 #define __net_initconst __initconst
293 struct pernet_operations {
294 struct list_head list;
295 int (*init)(struct net *net);
296 void (*exit)(struct net *net);
297 void (*exit_batch)(struct list_head *net_exit_list);
303 * Use these carefully. If you implement a network device and it
304 * needs per network namespace operations use device pernet operations,
305 * otherwise use pernet subsys operations.
307 * Network interfaces need to be removed from a dying netns _before_
308 * subsys notifiers can be called, as most of the network code cleanup
309 * (which is done from subsys notifiers) runs with the assumption that
310 * dev_remove_pack has been called so no new packets will arrive during
311 * and after the cleanup functions have been called. dev_remove_pack
312 * is not per namespace so instead the guarantee of no more packets
313 * arriving in a network namespace is provided by ensuring that all
314 * network devices and all sockets have left the network namespace
315 * before the cleanup methods are called.
317 * For the longest time the ipv4 icmp code was registered as a pernet
318 * device which caused kernel oops, and panics during network
319 * namespace cleanup. So please don't get this wrong.
321 int register_pernet_subsys(struct pernet_operations *);
322 void unregister_pernet_subsys(struct pernet_operations *);
323 int register_pernet_device(struct pernet_operations *);
324 void unregister_pernet_device(struct pernet_operations *);
327 struct ctl_table_header;
330 int net_sysctl_init(void);
331 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
332 struct ctl_table *table);
333 void unregister_net_sysctl_table(struct ctl_table_header *header);
335 static inline int net_sysctl_init(void) { return 0; }
336 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
337 const char *path, struct ctl_table *table)
341 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
346 static inline int rt_genid_ipv4(struct net *net)
348 return atomic_read(&net->ipv4.rt_genid);
351 static inline void rt_genid_bump_ipv4(struct net *net)
353 atomic_inc(&net->ipv4.rt_genid);
356 extern void (*__fib6_flush_trees)(struct net *net);
357 static inline void rt_genid_bump_ipv6(struct net *net)
359 if (__fib6_flush_trees)
360 __fib6_flush_trees(net);
363 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
364 static inline struct netns_ieee802154_lowpan *
365 net_ieee802154_lowpan(struct net *net)
367 return &net->ieee802154_lowpan;
371 /* For callers who don't really care about whether it's IPv4 or IPv6 */
372 static inline void rt_genid_bump_all(struct net *net)
374 rt_genid_bump_ipv4(net);
375 rt_genid_bump_ipv6(net);
378 static inline int fnhe_genid(struct net *net)
380 return atomic_read(&net->fnhe_genid);
383 static inline void fnhe_genid_bump(struct net *net)
385 atomic_inc(&net->fnhe_genid);
388 #endif /* __NET_NET_NAMESPACE_H */