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 */
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 #if IS_ENABLED(CONFIG_MPLS)
133 struct netns_mpls mpls;
135 struct sock *diag_nlsk;
139 #include <linux/seq_file_net.h>
141 /* Init's network namespace */
142 extern struct net init_net;
145 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
146 struct net *old_net);
148 #else /* CONFIG_NET_NS */
149 #include <linux/sched.h>
150 #include <linux/nsproxy.h>
151 static inline struct net *copy_net_ns(unsigned long flags,
152 struct user_namespace *user_ns, struct net *old_net)
154 if (flags & CLONE_NEWNET)
155 return ERR_PTR(-EINVAL);
158 #endif /* CONFIG_NET_NS */
161 extern struct list_head net_namespace_list;
163 struct net *get_net_ns_by_pid(pid_t pid);
164 struct net *get_net_ns_by_fd(int pid);
167 void ipx_register_sysctl(void);
168 void ipx_unregister_sysctl(void);
170 #define ipx_register_sysctl()
171 #define ipx_unregister_sysctl()
175 void __put_net(struct net *net);
177 static inline struct net *get_net(struct net *net)
179 atomic_inc(&net->count);
183 static inline struct net *maybe_get_net(struct net *net)
185 /* Used when we know struct net exists but we
186 * aren't guaranteed a previous reference count
187 * exists. If the reference count is zero this
188 * function fails and returns NULL.
190 if (!atomic_inc_not_zero(&net->count))
195 static inline void put_net(struct net *net)
197 if (atomic_dec_and_test(&net->count))
202 int net_eq(const struct net *net1, const struct net *net2)
207 void net_drop_ns(void *);
211 static inline struct net *get_net(struct net *net)
216 static inline void put_net(struct net *net)
220 static inline struct net *maybe_get_net(struct net *net)
226 int net_eq(const struct net *net1, const struct net *net2)
231 #define net_drop_ns NULL
241 static inline void write_pnet(possible_net_t *pnet, struct net *net)
248 static inline struct net *read_pnet(const possible_net_t *pnet)
257 #define for_each_net(VAR) \
258 list_for_each_entry(VAR, &net_namespace_list, list)
260 #define for_each_net_rcu(VAR) \
261 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
266 #define __net_initdata
267 #define __net_initconst
269 #define __net_init __init
270 #define __net_exit __exit_refok
271 #define __net_initdata __initdata
272 #define __net_initconst __initconst
275 int peernet2id_alloc(struct net *net, struct net *peer);
276 int peernet2id(struct net *net, struct net *peer);
277 bool peernet_has_id(struct net *net, struct net *peer);
278 struct net *get_net_ns_by_id(struct net *net, int id);
280 struct pernet_operations {
281 struct list_head list;
282 int (*init)(struct net *net);
283 void (*exit)(struct net *net);
284 void (*exit_batch)(struct list_head *net_exit_list);
290 * Use these carefully. If you implement a network device and it
291 * needs per network namespace operations use device pernet operations,
292 * otherwise use pernet subsys operations.
294 * Network interfaces need to be removed from a dying netns _before_
295 * subsys notifiers can be called, as most of the network code cleanup
296 * (which is done from subsys notifiers) runs with the assumption that
297 * dev_remove_pack has been called so no new packets will arrive during
298 * and after the cleanup functions have been called. dev_remove_pack
299 * is not per namespace so instead the guarantee of no more packets
300 * arriving in a network namespace is provided by ensuring that all
301 * network devices and all sockets have left the network namespace
302 * before the cleanup methods are called.
304 * For the longest time the ipv4 icmp code was registered as a pernet
305 * device which caused kernel oops, and panics during network
306 * namespace cleanup. So please don't get this wrong.
308 int register_pernet_subsys(struct pernet_operations *);
309 void unregister_pernet_subsys(struct pernet_operations *);
310 int register_pernet_device(struct pernet_operations *);
311 void unregister_pernet_device(struct pernet_operations *);
314 struct ctl_table_header;
317 int net_sysctl_init(void);
318 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
319 struct ctl_table *table);
320 void unregister_net_sysctl_table(struct ctl_table_header *header);
322 static inline int net_sysctl_init(void) { return 0; }
323 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
324 const char *path, struct ctl_table *table)
328 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
333 static inline int rt_genid_ipv4(struct net *net)
335 return atomic_read(&net->ipv4.rt_genid);
338 static inline void rt_genid_bump_ipv4(struct net *net)
340 atomic_inc(&net->ipv4.rt_genid);
343 extern void (*__fib6_flush_trees)(struct net *net);
344 static inline void rt_genid_bump_ipv6(struct net *net)
346 if (__fib6_flush_trees)
347 __fib6_flush_trees(net);
350 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
351 static inline struct netns_ieee802154_lowpan *
352 net_ieee802154_lowpan(struct net *net)
354 return &net->ieee802154_lowpan;
358 /* For callers who don't really care about whether it's IPv4 or IPv6 */
359 static inline void rt_genid_bump_all(struct net *net)
361 rt_genid_bump_ipv4(net);
362 rt_genid_bump_ipv6(net);
365 static inline int fnhe_genid(struct net *net)
367 return atomic_read(&net->fnhe_genid);
370 static inline void fnhe_genid_bump(struct net *net)
372 atomic_inc(&net->fnhe_genid);
375 #endif /* __NET_NET_NAMESPACE_H */