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 atomic64_t cookie_gen;
61 struct list_head list; /* list of network namespaces */
62 struct list_head cleanup_list; /* namespaces on death row */
63 struct list_head exit_list; /* Use only net_mutex */
65 struct user_namespace *user_ns; /* Owning user namespace */
70 struct proc_dir_entry *proc_net;
71 struct proc_dir_entry *proc_net_stat;
74 struct ctl_table_set sysctls;
77 struct sock *rtnl; /* rtnetlink socket */
78 struct sock *genl_sock;
80 struct list_head dev_base_head;
81 struct hlist_head *dev_name_head;
82 struct hlist_head *dev_index_head;
83 unsigned int dev_base_seq; /* protected by rtnl_mutex */
85 unsigned int dev_unreg_count;
88 struct list_head rules_ops;
91 struct net_device *loopback_dev; /* The loopback */
92 struct netns_core core;
94 struct netns_packet packet;
95 struct netns_unix unx;
96 struct netns_ipv4 ipv4;
97 #if IS_ENABLED(CONFIG_IPV6)
98 struct netns_ipv6 ipv6;
100 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
101 struct netns_ieee802154_lowpan ieee802154_lowpan;
103 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
104 struct netns_sctp sctp;
106 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
107 struct netns_dccp dccp;
109 #ifdef CONFIG_NETFILTER
112 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
115 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
116 struct netns_nftables nft;
118 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
119 struct netns_nf_frag nf_frag;
122 struct sock *nfnl_stash;
124 #ifdef CONFIG_WEXT_CORE
125 struct sk_buff_head wext_nlevents;
127 struct net_generic __rcu *gen;
129 /* Note : following structs are cache line aligned */
131 struct netns_xfrm xfrm;
133 #if IS_ENABLED(CONFIG_IP_VS)
134 struct netns_ipvs *ipvs;
136 #if IS_ENABLED(CONFIG_MPLS)
137 struct netns_mpls mpls;
139 struct sock *diag_nlsk;
143 #include <linux/seq_file_net.h>
145 /* Init's network namespace */
146 extern struct net init_net;
149 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
150 struct net *old_net);
152 #else /* CONFIG_NET_NS */
153 #include <linux/sched.h>
154 #include <linux/nsproxy.h>
155 static inline struct net *copy_net_ns(unsigned long flags,
156 struct user_namespace *user_ns, struct net *old_net)
158 if (flags & CLONE_NEWNET)
159 return ERR_PTR(-EINVAL);
162 #endif /* CONFIG_NET_NS */
165 extern struct list_head net_namespace_list;
167 struct net *get_net_ns_by_pid(pid_t pid);
168 struct net *get_net_ns_by_fd(int pid);
171 void ipx_register_sysctl(void);
172 void ipx_unregister_sysctl(void);
174 #define ipx_register_sysctl()
175 #define ipx_unregister_sysctl()
179 void __put_net(struct net *net);
181 static inline struct net *get_net(struct net *net)
183 atomic_inc(&net->count);
187 static inline struct net *maybe_get_net(struct net *net)
189 /* Used when we know struct net exists but we
190 * aren't guaranteed a previous reference count
191 * exists. If the reference count is zero this
192 * function fails and returns NULL.
194 if (!atomic_inc_not_zero(&net->count))
199 static inline void put_net(struct net *net)
201 if (atomic_dec_and_test(&net->count))
206 int net_eq(const struct net *net1, const struct net *net2)
211 void net_drop_ns(void *);
215 static inline struct net *get_net(struct net *net)
220 static inline void put_net(struct net *net)
224 static inline struct net *maybe_get_net(struct net *net)
230 int net_eq(const struct net *net1, const struct net *net2)
235 #define net_drop_ns NULL
239 #ifdef NETNS_REFCNT_DEBUG
240 static inline struct net *hold_net(struct net *net)
243 atomic_inc(&net->use_count);
247 static inline void release_net(struct net *net)
250 atomic_dec(&net->use_count);
253 static inline struct net *hold_net(struct net *net)
258 static inline void release_net(struct net *net)
265 static inline void write_pnet(struct net **pnet, struct net *net)
270 static inline struct net *read_pnet(struct net * const *pnet)
277 #define write_pnet(pnet, net) do { (void)(net);} while (0)
278 #define read_pnet(pnet) (&init_net)
282 #define for_each_net(VAR) \
283 list_for_each_entry(VAR, &net_namespace_list, list)
285 #define for_each_net_rcu(VAR) \
286 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
291 #define __net_initdata
292 #define __net_initconst
294 #define __net_init __init
295 #define __net_exit __exit_refok
296 #define __net_initdata __initdata
297 #define __net_initconst __initconst
300 int peernet2id(struct net *net, struct net *peer);
301 struct net *get_net_ns_by_id(struct net *net, int id);
303 struct pernet_operations {
304 struct list_head list;
305 int (*init)(struct net *net);
306 void (*exit)(struct net *net);
307 void (*exit_batch)(struct list_head *net_exit_list);
313 * Use these carefully. If you implement a network device and it
314 * needs per network namespace operations use device pernet operations,
315 * otherwise use pernet subsys operations.
317 * Network interfaces need to be removed from a dying netns _before_
318 * subsys notifiers can be called, as most of the network code cleanup
319 * (which is done from subsys notifiers) runs with the assumption that
320 * dev_remove_pack has been called so no new packets will arrive during
321 * and after the cleanup functions have been called. dev_remove_pack
322 * is not per namespace so instead the guarantee of no more packets
323 * arriving in a network namespace is provided by ensuring that all
324 * network devices and all sockets have left the network namespace
325 * before the cleanup methods are called.
327 * For the longest time the ipv4 icmp code was registered as a pernet
328 * device which caused kernel oops, and panics during network
329 * namespace cleanup. So please don't get this wrong.
331 int register_pernet_subsys(struct pernet_operations *);
332 void unregister_pernet_subsys(struct pernet_operations *);
333 int register_pernet_device(struct pernet_operations *);
334 void unregister_pernet_device(struct pernet_operations *);
337 struct ctl_table_header;
340 int net_sysctl_init(void);
341 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
342 struct ctl_table *table);
343 void unregister_net_sysctl_table(struct ctl_table_header *header);
345 static inline int net_sysctl_init(void) { return 0; }
346 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
347 const char *path, struct ctl_table *table)
351 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
356 static inline int rt_genid_ipv4(struct net *net)
358 return atomic_read(&net->ipv4.rt_genid);
361 static inline void rt_genid_bump_ipv4(struct net *net)
363 atomic_inc(&net->ipv4.rt_genid);
366 extern void (*__fib6_flush_trees)(struct net *net);
367 static inline void rt_genid_bump_ipv6(struct net *net)
369 if (__fib6_flush_trees)
370 __fib6_flush_trees(net);
373 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
374 static inline struct netns_ieee802154_lowpan *
375 net_ieee802154_lowpan(struct net *net)
377 return &net->ieee802154_lowpan;
381 /* For callers who don't really care about whether it's IPv4 or IPv6 */
382 static inline void rt_genid_bump_all(struct net *net)
384 rt_genid_bump_ipv4(net);
385 rt_genid_bump_ipv6(net);
388 static inline int fnhe_genid(struct net *net)
390 return atomic_read(&net->fnhe_genid);
393 static inline void fnhe_genid_bump(struct net *net)
395 atomic_inc(&net->fnhe_genid);
398 #endif /* __NET_NET_NAMESPACE_H */