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>
12 #include <net/netns/core.h>
13 #include <net/netns/mib.h>
14 #include <net/netns/unix.h>
15 #include <net/netns/packet.h>
16 #include <net/netns/ipv4.h>
17 #include <net/netns/ipv6.h>
18 #include <net/netns/sctp.h>
19 #include <net/netns/dccp.h>
20 #include <net/netns/netfilter.h>
21 #include <net/netns/x_tables.h>
22 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
23 #include <net/netns/conntrack.h>
25 #include <net/netns/xfrm.h>
27 struct user_namespace;
28 struct proc_dir_entry;
31 struct ctl_table_header;
37 #define NETDEV_HASHBITS 8
38 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
41 atomic_t passive; /* To decided when the network
42 * namespace should be freed.
44 atomic_t count; /* To decided when the network
45 * namespace should be shut down.
47 #ifdef NETNS_REFCNT_DEBUG
48 atomic_t use_count; /* To track references we
52 spinlock_t rules_mod_lock;
54 struct list_head list; /* list of network namespaces */
55 struct list_head cleanup_list; /* namespaces on death row */
56 struct list_head exit_list; /* Use only net_mutex */
58 struct user_namespace *user_ns; /* Owning user namespace */
60 unsigned int proc_inum;
62 struct proc_dir_entry *proc_net;
63 struct proc_dir_entry *proc_net_stat;
66 struct ctl_table_set sysctls;
69 struct sock *rtnl; /* rtnetlink socket */
70 struct sock *genl_sock;
72 struct list_head dev_base_head;
73 struct hlist_head *dev_name_head;
74 struct hlist_head *dev_index_head;
75 unsigned int dev_base_seq; /* protected by rtnl_mutex */
77 unsigned int dev_unreg_count;
80 struct list_head rules_ops;
83 struct net_device *loopback_dev; /* The loopback */
84 struct netns_core core;
86 struct netns_packet packet;
87 struct netns_unix unx;
88 struct netns_ipv4 ipv4;
89 #if IS_ENABLED(CONFIG_IPV6)
90 struct netns_ipv6 ipv6;
92 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
93 struct netns_sctp sctp;
95 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
96 struct netns_dccp dccp;
98 #ifdef CONFIG_NETFILTER
101 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
104 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
105 struct netns_nf_frag nf_frag;
108 struct sock *nfnl_stash;
110 #ifdef CONFIG_WEXT_CORE
111 struct sk_buff_head wext_nlevents;
113 struct net_generic __rcu *gen;
115 /* Note : following structs are cache line aligned */
117 struct netns_xfrm xfrm;
119 #if IS_ENABLED(CONFIG_IP_VS)
120 struct netns_ipvs *ipvs;
122 struct sock *diag_nlsk;
127 * ifindex generation is per-net namespace, and loopback is
128 * always the 1st device in ns (see net_dev_init), thus any
129 * loopback device should get ifindex 1
132 #define LOOPBACK_IFINDEX 1
134 #include <linux/seq_file_net.h>
136 /* Init's network namespace */
137 extern struct net init_net;
140 extern struct net *copy_net_ns(unsigned long flags,
141 struct user_namespace *user_ns, struct net *old_net);
143 #else /* CONFIG_NET_NS */
144 #include <linux/sched.h>
145 #include <linux/nsproxy.h>
146 static inline struct net *copy_net_ns(unsigned long flags,
147 struct user_namespace *user_ns, struct net *old_net)
149 if (flags & CLONE_NEWNET)
150 return ERR_PTR(-EINVAL);
153 #endif /* CONFIG_NET_NS */
156 extern struct list_head net_namespace_list;
158 extern struct net *get_net_ns_by_pid(pid_t pid);
159 extern struct net *get_net_ns_by_fd(int pid);
162 extern void __put_net(struct net *net);
164 static inline struct net *get_net(struct net *net)
166 atomic_inc(&net->count);
170 static inline struct net *maybe_get_net(struct net *net)
172 /* Used when we know struct net exists but we
173 * aren't guaranteed a previous reference count
174 * exists. If the reference count is zero this
175 * function fails and returns NULL.
177 if (!atomic_inc_not_zero(&net->count))
182 static inline void put_net(struct net *net)
184 if (atomic_dec_and_test(&net->count))
189 int net_eq(const struct net *net1, const struct net *net2)
194 extern void net_drop_ns(void *);
198 static inline struct net *get_net(struct net *net)
203 static inline void put_net(struct net *net)
207 static inline struct net *maybe_get_net(struct net *net)
213 int net_eq(const struct net *net1, const struct net *net2)
218 #define net_drop_ns NULL
222 #ifdef NETNS_REFCNT_DEBUG
223 static inline struct net *hold_net(struct net *net)
226 atomic_inc(&net->use_count);
230 static inline void release_net(struct net *net)
233 atomic_dec(&net->use_count);
236 static inline struct net *hold_net(struct net *net)
241 static inline void release_net(struct net *net)
248 static inline void write_pnet(struct net **pnet, struct net *net)
253 static inline struct net *read_pnet(struct net * const *pnet)
260 #define write_pnet(pnet, net) do { (void)(net);} while (0)
261 #define read_pnet(pnet) (&init_net)
265 #define for_each_net(VAR) \
266 list_for_each_entry(VAR, &net_namespace_list, list)
268 #define for_each_net_rcu(VAR) \
269 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
274 #define __net_initdata
275 #define __net_initconst
277 #define __net_init __init
278 #define __net_exit __exit_refok
279 #define __net_initdata __initdata
280 #define __net_initconst __initconst
283 struct pernet_operations {
284 struct list_head list;
285 int (*init)(struct net *net);
286 void (*exit)(struct net *net);
287 void (*exit_batch)(struct list_head *net_exit_list);
293 * Use these carefully. If you implement a network device and it
294 * needs per network namespace operations use device pernet operations,
295 * otherwise use pernet subsys operations.
297 * Network interfaces need to be removed from a dying netns _before_
298 * subsys notifiers can be called, as most of the network code cleanup
299 * (which is done from subsys notifiers) runs with the assumption that
300 * dev_remove_pack has been called so no new packets will arrive during
301 * and after the cleanup functions have been called. dev_remove_pack
302 * is not per namespace so instead the guarantee of no more packets
303 * arriving in a network namespace is provided by ensuring that all
304 * network devices and all sockets have left the network namespace
305 * before the cleanup methods are called.
307 * For the longest time the ipv4 icmp code was registered as a pernet
308 * device which caused kernel oops, and panics during network
309 * namespace cleanup. So please don't get this wrong.
311 extern int register_pernet_subsys(struct pernet_operations *);
312 extern void unregister_pernet_subsys(struct pernet_operations *);
313 extern int register_pernet_device(struct pernet_operations *);
314 extern void unregister_pernet_device(struct pernet_operations *);
317 struct ctl_table_header;
320 extern int net_sysctl_init(void);
321 extern struct ctl_table_header *register_net_sysctl(struct net *net,
322 const char *path, struct ctl_table *table);
323 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
325 static inline int net_sysctl_init(void) { return 0; }
326 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
327 const char *path, struct ctl_table *table)
331 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
336 static inline int rt_genid_ipv4(struct net *net)
338 return atomic_read(&net->ipv4.rt_genid);
341 static inline void rt_genid_bump_ipv4(struct net *net)
343 atomic_inc(&net->ipv4.rt_genid);
346 #if IS_ENABLED(CONFIG_IPV6)
347 static inline int rt_genid_ipv6(struct net *net)
349 return atomic_read(&net->ipv6.rt_genid);
352 static inline void rt_genid_bump_ipv6(struct net *net)
354 atomic_inc(&net->ipv6.rt_genid);
357 static inline int rt_genid_ipv6(struct net *net)
362 static inline void rt_genid_bump_ipv6(struct net *net)
367 /* For callers who don't really care about whether it's IPv4 or IPv6 */
368 static inline void rt_genid_bump_all(struct net *net)
370 rt_genid_bump_ipv4(net);
371 rt_genid_bump_ipv6(net);
374 static inline int fnhe_genid(struct net *net)
376 return atomic_read(&net->fnhe_genid);
379 static inline void fnhe_genid_bump(struct net *net)
381 atomic_inc(&net->fnhe_genid);
384 #endif /* __NET_NET_NAMESPACE_H */