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 */
79 struct list_head rules_ops;
82 struct net_device *loopback_dev; /* The loopback */
83 struct netns_core core;
85 struct netns_packet packet;
86 struct netns_unix unx;
87 struct netns_ipv4 ipv4;
88 #if IS_ENABLED(CONFIG_IPV6)
89 struct netns_ipv6 ipv6;
91 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
92 struct netns_sctp sctp;
94 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
95 struct netns_dccp dccp;
97 #ifdef CONFIG_NETFILTER
100 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
103 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
104 struct netns_nf_frag nf_frag;
107 struct sock *nfnl_stash;
109 #ifdef CONFIG_WEXT_CORE
110 struct sk_buff_head wext_nlevents;
112 struct net_generic __rcu *gen;
114 /* Note : following structs are cache line aligned */
116 struct netns_xfrm xfrm;
118 #if IS_ENABLED(CONFIG_IP_VS)
119 struct netns_ipvs *ipvs;
121 struct sock *diag_nlsk;
126 * ifindex generation is per-net namespace, and loopback is
127 * always the 1st device in ns (see net_dev_init), thus any
128 * loopback device should get ifindex 1
131 #define LOOPBACK_IFINDEX 1
133 #include <linux/seq_file_net.h>
135 /* Init's network namespace */
136 extern struct net init_net;
139 extern struct net *copy_net_ns(unsigned long flags,
140 struct user_namespace *user_ns, struct net *old_net);
142 #else /* CONFIG_NET_NS */
143 #include <linux/sched.h>
144 #include <linux/nsproxy.h>
145 static inline struct net *copy_net_ns(unsigned long flags,
146 struct user_namespace *user_ns, struct net *old_net)
148 if (flags & CLONE_NEWNET)
149 return ERR_PTR(-EINVAL);
152 #endif /* CONFIG_NET_NS */
155 extern struct list_head net_namespace_list;
157 extern struct net *get_net_ns_by_pid(pid_t pid);
158 extern struct net *get_net_ns_by_fd(int pid);
161 extern void __put_net(struct net *net);
163 static inline struct net *get_net(struct net *net)
165 atomic_inc(&net->count);
169 static inline struct net *maybe_get_net(struct net *net)
171 /* Used when we know struct net exists but we
172 * aren't guaranteed a previous reference count
173 * exists. If the reference count is zero this
174 * function fails and returns NULL.
176 if (!atomic_inc_not_zero(&net->count))
181 static inline void put_net(struct net *net)
183 if (atomic_dec_and_test(&net->count))
188 int net_eq(const struct net *net1, const struct net *net2)
193 extern void net_drop_ns(void *);
197 static inline struct net *get_net(struct net *net)
202 static inline void put_net(struct net *net)
206 static inline struct net *maybe_get_net(struct net *net)
212 int net_eq(const struct net *net1, const struct net *net2)
217 #define net_drop_ns NULL
221 #ifdef NETNS_REFCNT_DEBUG
222 static inline struct net *hold_net(struct net *net)
225 atomic_inc(&net->use_count);
229 static inline void release_net(struct net *net)
232 atomic_dec(&net->use_count);
235 static inline struct net *hold_net(struct net *net)
240 static inline void release_net(struct net *net)
247 static inline void write_pnet(struct net **pnet, struct net *net)
252 static inline struct net *read_pnet(struct net * const *pnet)
259 #define write_pnet(pnet, net) do { (void)(net);} while (0)
260 #define read_pnet(pnet) (&init_net)
264 #define for_each_net(VAR) \
265 list_for_each_entry(VAR, &net_namespace_list, list)
267 #define for_each_net_rcu(VAR) \
268 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
273 #define __net_initdata
274 #define __net_initconst
276 #define __net_init __init
277 #define __net_exit __exit_refok
278 #define __net_initdata __initdata
279 #define __net_initconst __initconst
282 struct pernet_operations {
283 struct list_head list;
284 int (*init)(struct net *net);
285 void (*exit)(struct net *net);
286 void (*exit_batch)(struct list_head *net_exit_list);
292 * Use these carefully. If you implement a network device and it
293 * needs per network namespace operations use device pernet operations,
294 * otherwise use pernet subsys operations.
296 * Network interfaces need to be removed from a dying netns _before_
297 * subsys notifiers can be called, as most of the network code cleanup
298 * (which is done from subsys notifiers) runs with the assumption that
299 * dev_remove_pack has been called so no new packets will arrive during
300 * and after the cleanup functions have been called. dev_remove_pack
301 * is not per namespace so instead the guarantee of no more packets
302 * arriving in a network namespace is provided by ensuring that all
303 * network devices and all sockets have left the network namespace
304 * before the cleanup methods are called.
306 * For the longest time the ipv4 icmp code was registered as a pernet
307 * device which caused kernel oops, and panics during network
308 * namespace cleanup. So please don't get this wrong.
310 extern int register_pernet_subsys(struct pernet_operations *);
311 extern void unregister_pernet_subsys(struct pernet_operations *);
312 extern int register_pernet_device(struct pernet_operations *);
313 extern void unregister_pernet_device(struct pernet_operations *);
316 struct ctl_table_header;
319 extern int net_sysctl_init(void);
320 extern struct ctl_table_header *register_net_sysctl(struct net *net,
321 const char *path, struct ctl_table *table);
322 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
324 static inline int net_sysctl_init(void) { return 0; }
325 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
326 const char *path, struct ctl_table *table)
330 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
335 static inline int rt_genid_ipv4(struct net *net)
337 return atomic_read(&net->ipv4.rt_genid);
340 static inline void rt_genid_bump_ipv4(struct net *net)
342 atomic_inc(&net->ipv4.rt_genid);
345 #if IS_ENABLED(CONFIG_IPV6)
346 static inline int rt_genid_ipv6(struct net *net)
348 return atomic_read(&net->ipv6.rt_genid);
351 static inline void rt_genid_bump_ipv6(struct net *net)
353 atomic_inc(&net->ipv6.rt_genid);
356 static inline int rt_genid_ipv6(struct net *net)
361 static inline void rt_genid_bump_ipv6(struct net *net)
366 /* For callers who don't really care about whether it's IPv4 or IPv6 */
367 static inline void rt_genid_bump_all(struct net *net)
369 rt_genid_bump_ipv4(net);
370 rt_genid_bump_ipv6(net);
373 static inline int fnhe_genid(struct net *net)
375 return atomic_read(&net->fnhe_genid);
378 static inline void fnhe_genid_bump(struct net *net)
380 atomic_inc(&net->fnhe_genid);
383 #endif /* __NET_NET_NAMESPACE_H */