1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Operations on the network namespace
5 #ifndef __NET_NET_NAMESPACE_H
6 #define __NET_NET_NAMESPACE_H
8 #include <linux/atomic.h>
9 #include <linux/refcount.h>
10 #include <linux/workqueue.h>
11 #include <linux/list.h>
12 #include <linux/sysctl.h>
13 #include <linux/uidgid.h>
16 #include <net/netns/core.h>
17 #include <net/netns/mib.h>
18 #include <net/netns/unix.h>
19 #include <net/netns/packet.h>
20 #include <net/netns/ipv4.h>
21 #include <net/netns/ipv6.h>
22 #include <net/netns/ieee802154_6lowpan.h>
23 #include <net/netns/sctp.h>
24 #include <net/netns/dccp.h>
25 #include <net/netns/netfilter.h>
26 #include <net/netns/x_tables.h>
27 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
28 #include <net/netns/conntrack.h>
30 #include <net/netns/nftables.h>
31 #include <net/netns/xfrm.h>
32 #include <net/netns/mpls.h>
33 #include <net/netns/can.h>
34 #include <net/netns/xdp.h>
35 #include <linux/ns_common.h>
36 #include <linux/idr.h>
37 #include <linux/skbuff.h>
39 struct user_namespace;
40 struct proc_dir_entry;
43 struct ctl_table_header;
50 #define NETDEV_HASHBITS 8
51 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
54 refcount_t passive; /* To decided when the network
55 * namespace should be freed.
57 refcount_t count; /* To decided when the network
58 * namespace should be shut down.
60 spinlock_t rules_mod_lock;
63 atomic64_t cookie_gen;
65 struct list_head list; /* list of network namespaces */
66 struct list_head exit_list; /* To linked to call pernet exit
67 * methods on dead net (
68 * pernet_ops_rwsem read locked),
69 * or to unregister pernet ops
70 * (pernet_ops_rwsem write locked).
72 struct llist_node cleanup_list; /* namespaces on death row */
75 struct key_tag *key_domain; /* Key domain of operation tag */
77 struct user_namespace *user_ns; /* Owning user namespace */
78 struct ucounts *ucounts;
84 struct proc_dir_entry *proc_net;
85 struct proc_dir_entry *proc_net_stat;
88 struct ctl_table_set sysctls;
91 struct sock *rtnl; /* rtnetlink socket */
92 struct sock *genl_sock;
94 struct uevent_sock *uevent_sock; /* uevent socket */
96 struct list_head dev_base_head;
97 struct hlist_head *dev_name_head;
98 struct hlist_head *dev_index_head;
99 unsigned int dev_base_seq; /* protected by rtnl_mutex */
101 unsigned int dev_unreg_count;
104 struct list_head rules_ops;
106 struct list_head fib_notifier_ops; /* Populated by
107 * register_pernet_subsys()
109 struct net_device *loopback_dev; /* The loopback */
110 struct netns_core core;
111 struct netns_mib mib;
112 struct netns_packet packet;
113 struct netns_unix unx;
114 struct netns_ipv4 ipv4;
115 #if IS_ENABLED(CONFIG_IPV6)
116 struct netns_ipv6 ipv6;
118 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
119 struct netns_ieee802154_lowpan ieee802154_lowpan;
121 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
122 struct netns_sctp sctp;
124 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
125 struct netns_dccp dccp;
127 #ifdef CONFIG_NETFILTER
130 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
133 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
134 struct netns_nftables nft;
136 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
137 struct netns_nf_frag nf_frag;
138 struct ctl_table_header *nf_frag_frags_hdr;
141 struct sock *nfnl_stash;
142 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
143 struct list_head nfnl_acct_list;
145 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
146 struct list_head nfct_timeout_list;
149 #ifdef CONFIG_WEXT_CORE
150 struct sk_buff_head wext_nlevents;
152 struct net_generic __rcu *gen;
154 struct bpf_prog __rcu *flow_dissector_prog;
156 /* Note : following structs are cache line aligned */
158 struct netns_xfrm xfrm;
160 #if IS_ENABLED(CONFIG_IP_VS)
161 struct netns_ipvs *ipvs;
163 #if IS_ENABLED(CONFIG_MPLS)
164 struct netns_mpls mpls;
166 #if IS_ENABLED(CONFIG_CAN)
167 struct netns_can can;
169 #ifdef CONFIG_XDP_SOCKETS
170 struct netns_xdp xdp;
172 struct sock *diag_nlsk;
174 } __randomize_layout;
176 #include <linux/seq_file_net.h>
178 /* Init's network namespace */
179 extern struct net init_net;
182 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
183 struct net *old_net);
185 void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
187 void net_ns_barrier(void);
188 #else /* CONFIG_NET_NS */
189 #include <linux/sched.h>
190 #include <linux/nsproxy.h>
191 static inline struct net *copy_net_ns(unsigned long flags,
192 struct user_namespace *user_ns, struct net *old_net)
194 if (flags & CLONE_NEWNET)
195 return ERR_PTR(-EINVAL);
199 static inline void net_ns_get_ownership(const struct net *net,
200 kuid_t *uid, kgid_t *gid)
202 *uid = GLOBAL_ROOT_UID;
203 *gid = GLOBAL_ROOT_GID;
206 static inline void net_ns_barrier(void) {}
207 #endif /* CONFIG_NET_NS */
210 extern struct list_head net_namespace_list;
212 struct net *get_net_ns_by_pid(pid_t pid);
213 struct net *get_net_ns_by_fd(int fd);
216 void ipx_register_sysctl(void);
217 void ipx_unregister_sysctl(void);
219 #define ipx_register_sysctl()
220 #define ipx_unregister_sysctl()
224 void __put_net(struct net *net);
226 static inline struct net *get_net(struct net *net)
228 refcount_inc(&net->count);
232 static inline struct net *maybe_get_net(struct net *net)
234 /* Used when we know struct net exists but we
235 * aren't guaranteed a previous reference count
236 * exists. If the reference count is zero this
237 * function fails and returns NULL.
239 if (!refcount_inc_not_zero(&net->count))
244 static inline void put_net(struct net *net)
246 if (refcount_dec_and_test(&net->count))
251 int net_eq(const struct net *net1, const struct net *net2)
256 static inline int check_net(const struct net *net)
258 return refcount_read(&net->count) != 0;
261 void net_drop_ns(void *);
265 static inline struct net *get_net(struct net *net)
270 static inline void put_net(struct net *net)
274 static inline struct net *maybe_get_net(struct net *net)
280 int net_eq(const struct net *net1, const struct net *net2)
285 static inline int check_net(const struct net *net)
290 #define net_drop_ns NULL
300 static inline void write_pnet(possible_net_t *pnet, struct net *net)
307 static inline struct net *read_pnet(const possible_net_t *pnet)
316 /* Protected by net_rwsem */
317 #define for_each_net(VAR) \
318 list_for_each_entry(VAR, &net_namespace_list, list)
320 #define for_each_net_rcu(VAR) \
321 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
326 #define __net_initdata
327 #define __net_initconst
329 #define __net_init __init
330 #define __net_exit __ref
331 #define __net_initdata __initdata
332 #define __net_initconst __initconst
335 int peernet2id_alloc(struct net *net, struct net *peer);
336 int peernet2id(struct net *net, struct net *peer);
337 bool peernet_has_id(struct net *net, struct net *peer);
338 struct net *get_net_ns_by_id(struct net *net, int id);
340 struct pernet_operations {
341 struct list_head list;
343 * Below methods are called without any exclusive locks.
344 * More than one net may be constructed and destructed
345 * in parallel on several cpus. Every pernet_operations
346 * have to keep in mind all other pernet_operations and
347 * to introduce a locking, if they share common resources.
349 * The only time they are called with exclusive lock is
350 * from register_pernet_subsys(), unregister_pernet_subsys()
351 * register_pernet_device() and unregister_pernet_device().
353 * Exit methods using blocking RCU primitives, such as
354 * synchronize_rcu(), should be implemented via exit_batch.
355 * Then, destruction of a group of net requires single
356 * synchronize_rcu() related to these pernet_operations,
357 * instead of separate synchronize_rcu() for every net.
358 * Please, avoid synchronize_rcu() at all, where it's possible.
360 int (*init)(struct net *net);
361 void (*exit)(struct net *net);
362 void (*exit_batch)(struct list_head *net_exit_list);
368 * Use these carefully. If you implement a network device and it
369 * needs per network namespace operations use device pernet operations,
370 * otherwise use pernet subsys operations.
372 * Network interfaces need to be removed from a dying netns _before_
373 * subsys notifiers can be called, as most of the network code cleanup
374 * (which is done from subsys notifiers) runs with the assumption that
375 * dev_remove_pack has been called so no new packets will arrive during
376 * and after the cleanup functions have been called. dev_remove_pack
377 * is not per namespace so instead the guarantee of no more packets
378 * arriving in a network namespace is provided by ensuring that all
379 * network devices and all sockets have left the network namespace
380 * before the cleanup methods are called.
382 * For the longest time the ipv4 icmp code was registered as a pernet
383 * device which caused kernel oops, and panics during network
384 * namespace cleanup. So please don't get this wrong.
386 int register_pernet_subsys(struct pernet_operations *);
387 void unregister_pernet_subsys(struct pernet_operations *);
388 int register_pernet_device(struct pernet_operations *);
389 void unregister_pernet_device(struct pernet_operations *);
392 struct ctl_table_header;
395 int net_sysctl_init(void);
396 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
397 struct ctl_table *table);
398 void unregister_net_sysctl_table(struct ctl_table_header *header);
400 static inline int net_sysctl_init(void) { return 0; }
401 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
402 const char *path, struct ctl_table *table)
406 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
411 static inline int rt_genid_ipv4(struct net *net)
413 return atomic_read(&net->ipv4.rt_genid);
416 static inline void rt_genid_bump_ipv4(struct net *net)
418 atomic_inc(&net->ipv4.rt_genid);
421 extern void (*__fib6_flush_trees)(struct net *net);
422 static inline void rt_genid_bump_ipv6(struct net *net)
424 if (__fib6_flush_trees)
425 __fib6_flush_trees(net);
428 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
429 static inline struct netns_ieee802154_lowpan *
430 net_ieee802154_lowpan(struct net *net)
432 return &net->ieee802154_lowpan;
436 /* For callers who don't really care about whether it's IPv4 or IPv6 */
437 static inline void rt_genid_bump_all(struct net *net)
439 rt_genid_bump_ipv4(net);
440 rt_genid_bump_ipv6(net);
443 static inline int fnhe_genid(struct net *net)
445 return atomic_read(&net->fnhe_genid);
448 static inline void fnhe_genid_bump(struct net *net)
450 atomic_inc(&net->fnhe_genid);
453 #endif /* __NET_NET_NAMESPACE_H */