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/x_tables.h>
21 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
22 #include <net/netns/conntrack.h>
24 #include <net/netns/xfrm.h>
26 struct proc_dir_entry
;
29 struct ctl_table_header
;
35 #define NETDEV_HASHBITS 8
36 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
39 atomic_t passive
; /* To decided when the network
40 * namespace should be freed.
42 atomic_t count
; /* To decided when the network
43 * namespace should be shut down.
45 #ifdef NETNS_REFCNT_DEBUG
46 atomic_t use_count
; /* To track references we
50 spinlock_t rules_mod_lock
;
52 struct list_head list
; /* list of network namespaces */
53 struct list_head cleanup_list
; /* namespaces on death row */
54 struct list_head exit_list
; /* Use only net_mutex */
56 struct proc_dir_entry
*proc_net
;
57 struct proc_dir_entry
*proc_net_stat
;
60 struct ctl_table_set sysctls
;
63 struct sock
*rtnl
; /* rtnetlink socket */
64 struct sock
*genl_sock
;
66 struct list_head dev_base_head
;
67 struct hlist_head
*dev_name_head
;
68 struct hlist_head
*dev_index_head
;
69 unsigned int dev_base_seq
; /* protected by rtnl_mutex */
73 struct list_head rules_ops
;
76 struct net_device
*loopback_dev
; /* The loopback */
77 struct netns_core core
;
79 struct netns_packet packet
;
80 struct netns_unix unx
;
81 struct netns_ipv4 ipv4
;
82 #if IS_ENABLED(CONFIG_IPV6)
83 struct netns_ipv6 ipv6
;
85 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
86 struct netns_sctp sctp
;
88 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
89 struct netns_dccp dccp
;
91 #ifdef CONFIG_NETFILTER
93 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
96 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
97 struct netns_nf_frag nf_frag
;
100 struct sock
*nfnl_stash
;
102 #ifdef CONFIG_WEXT_CORE
103 struct sk_buff_head wext_nlevents
;
105 struct net_generic __rcu
*gen
;
107 /* Note : following structs are cache line aligned */
109 struct netns_xfrm xfrm
;
111 struct netns_ipvs
*ipvs
;
112 struct sock
*diag_nlsk
;
117 * ifindex generation is per-net namespace, and loopback is
118 * always the 1st device in ns (see net_dev_init), thus any
119 * loopback device should get ifindex 1
122 #define LOOPBACK_IFINDEX 1
124 #include <linux/seq_file_net.h>
126 /* Init's network namespace */
127 extern struct net init_net
;
130 extern struct net
*copy_net_ns(unsigned long flags
, struct net
*net_ns
);
132 #else /* CONFIG_NET */
133 static inline struct net
*copy_net_ns(unsigned long flags
, struct net
*net_ns
)
135 /* There is nothing to copy so this is a noop */
138 #endif /* CONFIG_NET */
141 extern struct list_head net_namespace_list
;
143 extern struct net
*get_net_ns_by_pid(pid_t pid
);
144 extern struct net
*get_net_ns_by_fd(int pid
);
147 extern void __put_net(struct net
*net
);
149 static inline struct net
*get_net(struct net
*net
)
151 atomic_inc(&net
->count
);
155 static inline struct net
*maybe_get_net(struct net
*net
)
157 /* Used when we know struct net exists but we
158 * aren't guaranteed a previous reference count
159 * exists. If the reference count is zero this
160 * function fails and returns NULL.
162 if (!atomic_inc_not_zero(&net
->count
))
167 static inline void put_net(struct net
*net
)
169 if (atomic_dec_and_test(&net
->count
))
174 int net_eq(const struct net
*net1
, const struct net
*net2
)
179 extern void net_drop_ns(void *);
183 static inline struct net
*get_net(struct net
*net
)
188 static inline void put_net(struct net
*net
)
192 static inline struct net
*maybe_get_net(struct net
*net
)
198 int net_eq(const struct net
*net1
, const struct net
*net2
)
203 #define net_drop_ns NULL
207 #ifdef NETNS_REFCNT_DEBUG
208 static inline struct net
*hold_net(struct net
*net
)
211 atomic_inc(&net
->use_count
);
215 static inline void release_net(struct net
*net
)
218 atomic_dec(&net
->use_count
);
221 static inline struct net
*hold_net(struct net
*net
)
226 static inline void release_net(struct net
*net
)
233 static inline void write_pnet(struct net
**pnet
, struct net
*net
)
238 static inline struct net
*read_pnet(struct net
* const *pnet
)
245 #define write_pnet(pnet, net) do { (void)(net);} while (0)
246 #define read_pnet(pnet) (&init_net)
250 #define for_each_net(VAR) \
251 list_for_each_entry(VAR, &net_namespace_list, list)
253 #define for_each_net_rcu(VAR) \
254 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
259 #define __net_initdata
261 #define __net_init __init
262 #define __net_exit __exit_refok
263 #define __net_initdata __initdata
266 struct pernet_operations
{
267 struct list_head list
;
268 int (*init
)(struct net
*net
);
269 void (*exit
)(struct net
*net
);
270 void (*exit_batch
)(struct list_head
*net_exit_list
);
276 * Use these carefully. If you implement a network device and it
277 * needs per network namespace operations use device pernet operations,
278 * otherwise use pernet subsys operations.
280 * Network interfaces need to be removed from a dying netns _before_
281 * subsys notifiers can be called, as most of the network code cleanup
282 * (which is done from subsys notifiers) runs with the assumption that
283 * dev_remove_pack has been called so no new packets will arrive during
284 * and after the cleanup functions have been called. dev_remove_pack
285 * is not per namespace so instead the guarantee of no more packets
286 * arriving in a network namespace is provided by ensuring that all
287 * network devices and all sockets have left the network namespace
288 * before the cleanup methods are called.
290 * For the longest time the ipv4 icmp code was registered as a pernet
291 * device which caused kernel oops, and panics during network
292 * namespace cleanup. So please don't get this wrong.
294 extern int register_pernet_subsys(struct pernet_operations
*);
295 extern void unregister_pernet_subsys(struct pernet_operations
*);
296 extern int register_pernet_device(struct pernet_operations
*);
297 extern void unregister_pernet_device(struct pernet_operations
*);
300 struct ctl_table_header
;
303 extern int net_sysctl_init(void);
304 extern struct ctl_table_header
*register_net_sysctl(struct net
*net
,
305 const char *path
, struct ctl_table
*table
);
306 extern void unregister_net_sysctl_table(struct ctl_table_header
*header
);
308 static inline int net_sysctl_init(void) { return 0; }
309 static inline struct ctl_table_header
*register_net_sysctl(struct net
*net
,
310 const char *path
, struct ctl_table
*table
)
314 static inline void unregister_net_sysctl_table(struct ctl_table_header
*header
)
319 static inline int rt_genid(struct net
*net
)
321 return atomic_read(&net
->rt_genid
);
324 static inline void rt_genid_bump(struct net
*net
)
326 atomic_inc(&net
->rt_genid
);
329 #endif /* __NET_NET_NAMESPACE_H */