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>
13 #include <net/netns/core.h>
14 #include <net/netns/mib.h>
15 #include <net/netns/unix.h>
16 #include <net/netns/packet.h>
17 #include <net/netns/ipv4.h>
18 #include <net/netns/ipv6.h>
19 #include <net/netns/ieee802154_6lowpan.h>
20 #include <net/netns/sctp.h>
21 #include <net/netns/dccp.h>
22 #include <net/netns/netfilter.h>
23 #include <net/netns/x_tables.h>
24 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
25 #include <net/netns/conntrack.h>
27 #include <net/netns/nftables.h>
28 #include <net/netns/xfrm.h>
29 #include <net/netns/mpls.h>
30 #include <linux/ns_common.h>
31 #include <linux/idr.h>
32 #include <linux/skbuff.h>
34 struct user_namespace;
35 struct proc_dir_entry;
38 struct ctl_table_header;
44 #define NETDEV_HASHBITS 8
45 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
48 atomic_t passive; /* To decided when the network
49 * namespace should be freed.
51 atomic_t count; /* To decided when the network
52 * namespace should be shut down.
54 spinlock_t rules_mod_lock;
57 atomic64_t cookie_gen;
59 struct list_head list; /* list of network namespaces */
60 struct list_head cleanup_list; /* namespaces on death row */
61 struct list_head exit_list; /* Use only net_mutex */
63 struct user_namespace *user_ns; /* Owning user namespace */
64 struct ucounts *ucounts;
70 struct proc_dir_entry *proc_net;
71 struct proc_dir_entry *proc_net_stat;
74 struct ctl_table_set sysctls;
77 struct sock *rtnl; /* rtnetlink socket */
78 struct sock *genl_sock;
80 struct list_head dev_base_head;
81 struct hlist_head *dev_name_head;
82 struct hlist_head *dev_index_head;
83 unsigned int dev_base_seq; /* protected by rtnl_mutex */
85 unsigned int dev_unreg_count;
88 struct list_head rules_ops;
91 struct net_device *loopback_dev; /* The loopback */
92 struct netns_core core;
94 struct netns_packet packet;
95 struct netns_unix unx;
96 struct netns_ipv4 ipv4;
97 #if IS_ENABLED(CONFIG_IPV6)
98 struct netns_ipv6 ipv6;
100 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
101 struct netns_ieee802154_lowpan ieee802154_lowpan;
103 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
104 struct netns_sctp sctp;
106 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
107 struct netns_dccp dccp;
109 #ifdef CONFIG_NETFILTER
112 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
115 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
116 struct netns_nftables nft;
118 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
119 struct netns_nf_frag nf_frag;
120 struct ctl_table_header *nf_frag_frags_hdr;
123 struct sock *nfnl_stash;
124 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
125 struct list_head nfnl_acct_list;
127 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
128 struct list_head nfct_timeout_list;
131 #ifdef CONFIG_WEXT_CORE
132 struct sk_buff_head wext_nlevents;
134 struct net_generic __rcu *gen;
136 /* Note : following structs are cache line aligned */
138 struct netns_xfrm xfrm;
140 #if IS_ENABLED(CONFIG_IP_VS)
141 struct netns_ipvs *ipvs;
143 #if IS_ENABLED(CONFIG_MPLS)
144 struct netns_mpls mpls;
146 struct sock *diag_nlsk;
150 #include <linux/seq_file_net.h>
152 /* Init's network namespace */
153 extern struct net init_net;
156 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
157 struct net *old_net);
159 #else /* CONFIG_NET_NS */
160 #include <linux/sched.h>
161 #include <linux/nsproxy.h>
162 static inline struct net *copy_net_ns(unsigned long flags,
163 struct user_namespace *user_ns, struct net *old_net)
165 if (flags & CLONE_NEWNET)
166 return ERR_PTR(-EINVAL);
169 #endif /* CONFIG_NET_NS */
172 extern struct list_head net_namespace_list;
174 struct net *get_net_ns_by_pid(pid_t pid);
175 struct net *get_net_ns_by_fd(int fd);
178 void ipx_register_sysctl(void);
179 void ipx_unregister_sysctl(void);
181 #define ipx_register_sysctl()
182 #define ipx_unregister_sysctl()
186 void __put_net(struct net *net);
188 static inline struct net *get_net(struct net *net)
190 atomic_inc(&net->count);
194 static inline struct net *maybe_get_net(struct net *net)
196 /* Used when we know struct net exists but we
197 * aren't guaranteed a previous reference count
198 * exists. If the reference count is zero this
199 * function fails and returns NULL.
201 if (!atomic_inc_not_zero(&net->count))
206 static inline void put_net(struct net *net)
208 if (atomic_dec_and_test(&net->count))
213 int net_eq(const struct net *net1, const struct net *net2)
218 static inline int check_net(const struct net *net)
220 return atomic_read(&net->count) != 0;
223 void net_drop_ns(void *);
227 static inline struct net *get_net(struct net *net)
232 static inline void put_net(struct net *net)
236 static inline struct net *maybe_get_net(struct net *net)
242 int net_eq(const struct net *net1, const struct net *net2)
247 static inline int check_net(const struct net *net)
252 #define net_drop_ns NULL
262 static inline void write_pnet(possible_net_t *pnet, struct net *net)
269 static inline struct net *read_pnet(const possible_net_t *pnet)
278 #define for_each_net(VAR) \
279 list_for_each_entry(VAR, &net_namespace_list, list)
281 #define for_each_net_rcu(VAR) \
282 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
287 #define __net_initdata
288 #define __net_initconst
290 #define __net_init __init
291 #define __net_exit __ref
292 #define __net_initdata __initdata
293 #define __net_initconst __initconst
296 int peernet2id_alloc(struct net *net, struct net *peer);
297 int peernet2id(struct net *net, struct net *peer);
298 bool peernet_has_id(struct net *net, struct net *peer);
299 struct net *get_net_ns_by_id(struct net *net, int id);
301 struct pernet_operations {
302 struct list_head list;
303 int (*init)(struct net *net);
304 void (*exit)(struct net *net);
305 void (*exit_batch)(struct list_head *net_exit_list);
311 * Use these carefully. If you implement a network device and it
312 * needs per network namespace operations use device pernet operations,
313 * otherwise use pernet subsys operations.
315 * Network interfaces need to be removed from a dying netns _before_
316 * subsys notifiers can be called, as most of the network code cleanup
317 * (which is done from subsys notifiers) runs with the assumption that
318 * dev_remove_pack has been called so no new packets will arrive during
319 * and after the cleanup functions have been called. dev_remove_pack
320 * is not per namespace so instead the guarantee of no more packets
321 * arriving in a network namespace is provided by ensuring that all
322 * network devices and all sockets have left the network namespace
323 * before the cleanup methods are called.
325 * For the longest time the ipv4 icmp code was registered as a pernet
326 * device which caused kernel oops, and panics during network
327 * namespace cleanup. So please don't get this wrong.
329 int register_pernet_subsys(struct pernet_operations *);
330 void unregister_pernet_subsys(struct pernet_operations *);
331 int register_pernet_device(struct pernet_operations *);
332 void unregister_pernet_device(struct pernet_operations *);
335 struct ctl_table_header;
338 int net_sysctl_init(void);
339 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
340 struct ctl_table *table);
341 void unregister_net_sysctl_table(struct ctl_table_header *header);
343 static inline int net_sysctl_init(void) { return 0; }
344 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
345 const char *path, struct ctl_table *table)
349 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
354 static inline int rt_genid_ipv4(struct net *net)
356 return atomic_read(&net->ipv4.rt_genid);
359 static inline void rt_genid_bump_ipv4(struct net *net)
361 atomic_inc(&net->ipv4.rt_genid);
364 extern void (*__fib6_flush_trees)(struct net *net);
365 static inline void rt_genid_bump_ipv6(struct net *net)
367 if (__fib6_flush_trees)
368 __fib6_flush_trees(net);
371 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
372 static inline struct netns_ieee802154_lowpan *
373 net_ieee802154_lowpan(struct net *net)
375 return &net->ieee802154_lowpan;
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 */