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/ieee802154_6lowpan.h>
19 #include <net/netns/sctp.h>
20 #include <net/netns/dccp.h>
21 #include <net/netns/netfilter.h>
22 #include <net/netns/x_tables.h>
23 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
24 #include <net/netns/conntrack.h>
26 #include <net/netns/nftables.h>
27 #include <net/netns/xfrm.h>
29 struct user_namespace;
30 struct proc_dir_entry;
33 struct ctl_table_header;
39 #define NETDEV_HASHBITS 8
40 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
43 atomic_t passive; /* To decided when the network
44 * namespace should be freed.
46 atomic_t count; /* To decided when the network
47 * namespace should be shut down.
49 #ifdef NETNS_REFCNT_DEBUG
50 atomic_t use_count; /* To track references we
54 spinlock_t rules_mod_lock;
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 */
62 unsigned int proc_inum;
64 struct proc_dir_entry *proc_net;
65 struct proc_dir_entry *proc_net_stat;
68 struct ctl_table_set sysctls;
71 struct sock *rtnl; /* rtnetlink socket */
72 struct sock *genl_sock;
74 struct list_head dev_base_head;
75 struct hlist_head *dev_name_head;
76 struct hlist_head *dev_index_head;
77 unsigned int dev_base_seq; /* protected by rtnl_mutex */
79 unsigned int dev_unreg_count;
82 struct list_head rules_ops;
85 struct net_device *loopback_dev; /* The loopback */
86 struct netns_core core;
88 struct netns_packet packet;
89 struct netns_unix unx;
90 struct netns_ipv4 ipv4;
91 #if IS_ENABLED(CONFIG_IPV6)
92 struct netns_ipv6 ipv6;
94 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
95 struct netns_ieee802154_lowpan ieee802154_lowpan;
97 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
98 struct netns_sctp sctp;
100 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
101 struct netns_dccp dccp;
103 #ifdef CONFIG_NETFILTER
106 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
109 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
110 struct netns_nftables nft;
112 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
113 struct netns_nf_frag nf_frag;
116 struct sock *nfnl_stash;
118 #ifdef CONFIG_WEXT_CORE
119 struct sk_buff_head wext_nlevents;
121 struct net_generic __rcu *gen;
123 /* Note : following structs are cache line aligned */
125 struct netns_xfrm xfrm;
127 #if IS_ENABLED(CONFIG_IP_VS)
128 struct netns_ipvs *ipvs;
130 struct sock *diag_nlsk;
135 * ifindex generation is per-net namespace, and loopback is
136 * always the 1st device in ns (see net_dev_init), thus any
137 * loopback device should get ifindex 1
140 #define LOOPBACK_IFINDEX 1
142 #include <linux/seq_file_net.h>
144 /* Init's network namespace */
145 extern struct net init_net;
148 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
149 struct net *old_net);
151 #else /* CONFIG_NET_NS */
152 #include <linux/sched.h>
153 #include <linux/nsproxy.h>
154 static inline struct net *copy_net_ns(unsigned long flags,
155 struct user_namespace *user_ns, struct net *old_net)
157 if (flags & CLONE_NEWNET)
158 return ERR_PTR(-EINVAL);
161 #endif /* CONFIG_NET_NS */
164 extern struct list_head net_namespace_list;
166 struct net *get_net_ns_by_pid(pid_t pid);
167 struct net *get_net_ns_by_fd(int pid);
170 void ipx_register_sysctl(void);
171 void ipx_unregister_sysctl(void);
173 #define ipx_register_sysctl()
174 #define ipx_unregister_sysctl()
178 void __put_net(struct net *net);
180 static inline struct net *get_net(struct net *net)
182 atomic_inc(&net->count);
186 static inline struct net *maybe_get_net(struct net *net)
188 /* Used when we know struct net exists but we
189 * aren't guaranteed a previous reference count
190 * exists. If the reference count is zero this
191 * function fails and returns NULL.
193 if (!atomic_inc_not_zero(&net->count))
198 static inline void put_net(struct net *net)
200 if (atomic_dec_and_test(&net->count))
205 int net_eq(const struct net *net1, const struct net *net2)
210 void net_drop_ns(void *);
214 static inline struct net *get_net(struct net *net)
219 static inline void put_net(struct net *net)
223 static inline struct net *maybe_get_net(struct net *net)
229 int net_eq(const struct net *net1, const struct net *net2)
234 #define net_drop_ns NULL
238 #ifdef NETNS_REFCNT_DEBUG
239 static inline struct net *hold_net(struct net *net)
242 atomic_inc(&net->use_count);
246 static inline void release_net(struct net *net)
249 atomic_dec(&net->use_count);
252 static inline struct net *hold_net(struct net *net)
257 static inline void release_net(struct net *net)
264 static inline void write_pnet(struct net **pnet, struct net *net)
269 static inline struct net *read_pnet(struct net * const *pnet)
276 #define write_pnet(pnet, net) do { (void)(net);} while (0)
277 #define read_pnet(pnet) (&init_net)
281 #define for_each_net(VAR) \
282 list_for_each_entry(VAR, &net_namespace_list, list)
284 #define for_each_net_rcu(VAR) \
285 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
290 #define __net_initdata
291 #define __net_initconst
293 #define __net_init __init
294 #define __net_exit __exit_refok
295 #define __net_initdata __initdata
296 #define __net_initconst __initconst
299 struct pernet_operations {
300 struct list_head list;
301 int (*init)(struct net *net);
302 void (*exit)(struct net *net);
303 void (*exit_batch)(struct list_head *net_exit_list);
309 * Use these carefully. If you implement a network device and it
310 * needs per network namespace operations use device pernet operations,
311 * otherwise use pernet subsys operations.
313 * Network interfaces need to be removed from a dying netns _before_
314 * subsys notifiers can be called, as most of the network code cleanup
315 * (which is done from subsys notifiers) runs with the assumption that
316 * dev_remove_pack has been called so no new packets will arrive during
317 * and after the cleanup functions have been called. dev_remove_pack
318 * is not per namespace so instead the guarantee of no more packets
319 * arriving in a network namespace is provided by ensuring that all
320 * network devices and all sockets have left the network namespace
321 * before the cleanup methods are called.
323 * For the longest time the ipv4 icmp code was registered as a pernet
324 * device which caused kernel oops, and panics during network
325 * namespace cleanup. So please don't get this wrong.
327 int register_pernet_subsys(struct pernet_operations *);
328 void unregister_pernet_subsys(struct pernet_operations *);
329 int register_pernet_device(struct pernet_operations *);
330 void unregister_pernet_device(struct pernet_operations *);
333 struct ctl_table_header;
336 int net_sysctl_init(void);
337 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
338 struct ctl_table *table);
339 void unregister_net_sysctl_table(struct ctl_table_header *header);
341 static inline int net_sysctl_init(void) { return 0; }
342 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
343 const char *path, struct ctl_table *table)
347 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
352 static inline int rt_genid_ipv4(struct net *net)
354 return atomic_read(&net->ipv4.rt_genid);
357 static inline void rt_genid_bump_ipv4(struct net *net)
359 atomic_inc(&net->ipv4.rt_genid);
362 #if IS_ENABLED(CONFIG_IPV6)
363 static inline int rt_genid_ipv6(struct net *net)
365 return atomic_read(&net->ipv6.rt_genid);
368 static inline void rt_genid_bump_ipv6(struct net *net)
370 atomic_inc(&net->ipv6.rt_genid);
373 static inline int rt_genid_ipv6(struct net *net)
378 static inline void rt_genid_bump_ipv6(struct net *net)
383 /* For callers who don't really care about whether it's IPv4 or IPv6 */
384 static inline void rt_genid_bump_all(struct net *net)
386 rt_genid_bump_ipv4(net);
387 rt_genid_bump_ipv6(net);
390 static inline int fnhe_genid(struct net *net)
392 return atomic_read(&net->fnhe_genid);
395 static inline void fnhe_genid_bump(struct net *net)
397 atomic_inc(&net->fnhe_genid);
400 #endif /* __NET_NET_NAMESPACE_H */