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/nftables.h>
26 #include <net/netns/xfrm.h>
28 struct user_namespace
;
29 struct proc_dir_entry
;
32 struct ctl_table_header
;
38 #define NETDEV_HASHBITS 8
39 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
42 atomic_t passive
; /* To decided when the network
43 * namespace should be freed.
45 atomic_t count
; /* To decided when the network
46 * namespace should be shut down.
48 #ifdef NETNS_REFCNT_DEBUG
49 atomic_t use_count
; /* To track references we
53 spinlock_t rules_mod_lock
;
55 struct list_head list
; /* list of network namespaces */
56 struct list_head cleanup_list
; /* namespaces on death row */
57 struct list_head exit_list
; /* Use only net_mutex */
59 struct user_namespace
*user_ns
; /* Owning user namespace */
61 unsigned int proc_inum
;
63 struct proc_dir_entry
*proc_net
;
64 struct proc_dir_entry
*proc_net_stat
;
67 struct ctl_table_set sysctls
;
70 struct sock
*rtnl
; /* rtnetlink socket */
71 struct sock
*genl_sock
;
73 struct list_head dev_base_head
;
74 struct hlist_head
*dev_name_head
;
75 struct hlist_head
*dev_index_head
;
76 unsigned int dev_base_seq
; /* protected by rtnl_mutex */
78 unsigned int dev_unreg_count
;
81 struct list_head rules_ops
;
84 struct net_device
*loopback_dev
; /* The loopback */
85 struct netns_core core
;
87 struct netns_packet packet
;
88 struct netns_unix unx
;
89 struct netns_ipv4 ipv4
;
90 #if IS_ENABLED(CONFIG_IPV6)
91 struct netns_ipv6 ipv6
;
93 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
94 struct netns_sctp sctp
;
96 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
97 struct netns_dccp dccp
;
99 #ifdef CONFIG_NETFILTER
102 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
105 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
106 struct netns_nftables nft
;
108 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
109 struct netns_nf_frag nf_frag
;
112 struct sock
*nfnl_stash
;
114 #ifdef CONFIG_WEXT_CORE
115 struct sk_buff_head wext_nlevents
;
117 struct net_generic __rcu
*gen
;
119 /* Note : following structs are cache line aligned */
121 struct netns_xfrm xfrm
;
123 #if IS_ENABLED(CONFIG_IP_VS)
124 struct netns_ipvs
*ipvs
;
126 struct sock
*diag_nlsk
;
131 * ifindex generation is per-net namespace, and loopback is
132 * always the 1st device in ns (see net_dev_init), thus any
133 * loopback device should get ifindex 1
136 #define LOOPBACK_IFINDEX 1
138 #include <linux/seq_file_net.h>
140 /* Init's network namespace */
141 extern struct net init_net
;
144 struct net
*copy_net_ns(unsigned long flags
, struct user_namespace
*user_ns
,
145 struct net
*old_net
);
147 #else /* CONFIG_NET_NS */
148 #include <linux/sched.h>
149 #include <linux/nsproxy.h>
150 static inline struct net
*copy_net_ns(unsigned long flags
,
151 struct user_namespace
*user_ns
, struct net
*old_net
)
153 if (flags
& CLONE_NEWNET
)
154 return ERR_PTR(-EINVAL
);
157 #endif /* CONFIG_NET_NS */
160 extern struct list_head net_namespace_list
;
162 struct net
*get_net_ns_by_pid(pid_t pid
);
163 struct net
*get_net_ns_by_fd(int pid
);
166 void ipx_register_sysctl(void);
167 void ipx_unregister_sysctl(void);
169 #define ipx_register_sysctl()
170 #define ipx_unregister_sysctl()
174 void __put_net(struct net
*net
);
176 static inline struct net
*get_net(struct net
*net
)
178 atomic_inc(&net
->count
);
182 static inline struct net
*maybe_get_net(struct net
*net
)
184 /* Used when we know struct net exists but we
185 * aren't guaranteed a previous reference count
186 * exists. If the reference count is zero this
187 * function fails and returns NULL.
189 if (!atomic_inc_not_zero(&net
->count
))
194 static inline void put_net(struct net
*net
)
196 if (atomic_dec_and_test(&net
->count
))
201 int net_eq(const struct net
*net1
, const struct net
*net2
)
206 void net_drop_ns(void *);
210 static inline struct net
*get_net(struct net
*net
)
215 static inline void put_net(struct net
*net
)
219 static inline struct net
*maybe_get_net(struct net
*net
)
225 int net_eq(const struct net
*net1
, const struct net
*net2
)
230 #define net_drop_ns NULL
234 #ifdef NETNS_REFCNT_DEBUG
235 static inline struct net
*hold_net(struct net
*net
)
238 atomic_inc(&net
->use_count
);
242 static inline void release_net(struct net
*net
)
245 atomic_dec(&net
->use_count
);
248 static inline struct net
*hold_net(struct net
*net
)
253 static inline void release_net(struct net
*net
)
260 static inline void write_pnet(struct net
**pnet
, struct net
*net
)
265 static inline struct net
*read_pnet(struct net
* const *pnet
)
272 #define write_pnet(pnet, net) do { (void)(net);} while (0)
273 #define read_pnet(pnet) (&init_net)
277 #define for_each_net(VAR) \
278 list_for_each_entry(VAR, &net_namespace_list, list)
280 #define for_each_net_rcu(VAR) \
281 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
286 #define __net_initdata
287 #define __net_initconst
289 #define __net_init __init
290 #define __net_exit __exit_refok
291 #define __net_initdata __initdata
292 #define __net_initconst __initconst
295 struct pernet_operations
{
296 struct list_head list
;
297 int (*init
)(struct net
*net
);
298 void (*exit
)(struct net
*net
);
299 void (*exit_batch
)(struct list_head
*net_exit_list
);
305 * Use these carefully. If you implement a network device and it
306 * needs per network namespace operations use device pernet operations,
307 * otherwise use pernet subsys operations.
309 * Network interfaces need to be removed from a dying netns _before_
310 * subsys notifiers can be called, as most of the network code cleanup
311 * (which is done from subsys notifiers) runs with the assumption that
312 * dev_remove_pack has been called so no new packets will arrive during
313 * and after the cleanup functions have been called. dev_remove_pack
314 * is not per namespace so instead the guarantee of no more packets
315 * arriving in a network namespace is provided by ensuring that all
316 * network devices and all sockets have left the network namespace
317 * before the cleanup methods are called.
319 * For the longest time the ipv4 icmp code was registered as a pernet
320 * device which caused kernel oops, and panics during network
321 * namespace cleanup. So please don't get this wrong.
323 int register_pernet_subsys(struct pernet_operations
*);
324 void unregister_pernet_subsys(struct pernet_operations
*);
325 int register_pernet_device(struct pernet_operations
*);
326 void unregister_pernet_device(struct pernet_operations
*);
329 struct ctl_table_header
;
332 int net_sysctl_init(void);
333 struct ctl_table_header
*register_net_sysctl(struct net
*net
, const char *path
,
334 struct ctl_table
*table
);
335 void unregister_net_sysctl_table(struct ctl_table_header
*header
);
337 static inline int net_sysctl_init(void) { return 0; }
338 static inline struct ctl_table_header
*register_net_sysctl(struct net
*net
,
339 const char *path
, struct ctl_table
*table
)
343 static inline void unregister_net_sysctl_table(struct ctl_table_header
*header
)
348 static inline int rt_genid_ipv4(struct net
*net
)
350 return atomic_read(&net
->ipv4
.rt_genid
);
353 static inline void rt_genid_bump_ipv4(struct net
*net
)
355 atomic_inc(&net
->ipv4
.rt_genid
);
358 #if IS_ENABLED(CONFIG_IPV6)
359 static inline int rt_genid_ipv6(struct net
*net
)
361 return atomic_read(&net
->ipv6
.rt_genid
);
364 static inline void rt_genid_bump_ipv6(struct net
*net
)
366 atomic_inc(&net
->ipv6
.rt_genid
);
369 static inline int rt_genid_ipv6(struct net
*net
)
374 static inline void rt_genid_bump_ipv6(struct net
*net
)
379 /* For callers who don't really care about whether it's IPv4 or IPv6 */
380 static inline void rt_genid_bump_all(struct net
*net
)
382 rt_genid_bump_ipv4(net
);
383 rt_genid_bump_ipv6(net
);
386 static inline int fnhe_genid(struct net
*net
)
388 return atomic_read(&net
->fnhe_genid
);
391 static inline void fnhe_genid_bump(struct net
*net
)
393 atomic_inc(&net
->fnhe_genid
);
396 #endif /* __NET_NET_NAMESPACE_H */