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/nexthop.h>
23 #include <net/netns/ieee802154_6lowpan.h>
24 #include <net/netns/sctp.h>
25 #include <net/netns/dccp.h>
26 #include <net/netns/netfilter.h>
27 #include <net/netns/x_tables.h>
28 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
29 #include <net/netns/conntrack.h>
31 #include <net/netns/nftables.h>
32 #include <net/netns/xfrm.h>
33 #include <net/netns/mpls.h>
34 #include <net/netns/can.h>
35 #include <net/netns/xdp.h>
36 #include <linux/ns_common.h>
37 #include <linux/idr.h>
38 #include <linux/skbuff.h>
40 struct user_namespace;
41 struct proc_dir_entry;
44 struct ctl_table_header;
51 #define NETDEV_HASHBITS 8
52 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
55 refcount_t passive; /* To decide when the network
56 * namespace should be freed.
58 refcount_t count; /* To decided when the network
59 * namespace should be shut down.
61 spinlock_t rules_mod_lock;
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 net_device *loopback_dev; /* The loopback */
107 struct netns_core core;
108 struct netns_mib mib;
109 struct netns_packet packet;
110 struct netns_unix unx;
111 struct netns_nexthop nexthop;
112 struct netns_ipv4 ipv4;
113 #if IS_ENABLED(CONFIG_IPV6)
114 struct netns_ipv6 ipv6;
116 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
117 struct netns_ieee802154_lowpan ieee802154_lowpan;
119 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
120 struct netns_sctp sctp;
122 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
123 struct netns_dccp dccp;
125 #ifdef CONFIG_NETFILTER
128 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
131 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
132 struct netns_nftables nft;
134 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
135 struct netns_nf_frag nf_frag;
136 struct ctl_table_header *nf_frag_frags_hdr;
139 struct sock *nfnl_stash;
140 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
141 struct list_head nfnl_acct_list;
143 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
144 struct list_head nfct_timeout_list;
147 #ifdef CONFIG_WEXT_CORE
148 struct sk_buff_head wext_nlevents;
150 struct net_generic __rcu *gen;
152 struct bpf_prog __rcu *flow_dissector_prog;
154 /* Note : following structs are cache line aligned */
156 struct netns_xfrm xfrm;
158 #if IS_ENABLED(CONFIG_IP_VS)
159 struct netns_ipvs *ipvs;
161 #if IS_ENABLED(CONFIG_MPLS)
162 struct netns_mpls mpls;
164 #if IS_ENABLED(CONFIG_CAN)
165 struct netns_can can;
167 #ifdef CONFIG_XDP_SOCKETS
168 struct netns_xdp xdp;
170 struct sock *diag_nlsk;
172 } __randomize_layout;
174 #include <linux/seq_file_net.h>
176 /* Init's network namespace */
177 extern struct net init_net;
180 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
181 struct net *old_net);
183 void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
185 void net_ns_barrier(void);
186 #else /* CONFIG_NET_NS */
187 #include <linux/sched.h>
188 #include <linux/nsproxy.h>
189 static inline struct net *copy_net_ns(unsigned long flags,
190 struct user_namespace *user_ns, struct net *old_net)
192 if (flags & CLONE_NEWNET)
193 return ERR_PTR(-EINVAL);
197 static inline void net_ns_get_ownership(const struct net *net,
198 kuid_t *uid, kgid_t *gid)
200 *uid = GLOBAL_ROOT_UID;
201 *gid = GLOBAL_ROOT_GID;
204 static inline void net_ns_barrier(void) {}
205 #endif /* CONFIG_NET_NS */
208 extern struct list_head net_namespace_list;
210 struct net *get_net_ns_by_pid(pid_t pid);
211 struct net *get_net_ns_by_fd(int fd);
214 void ipx_register_sysctl(void);
215 void ipx_unregister_sysctl(void);
217 #define ipx_register_sysctl()
218 #define ipx_unregister_sysctl()
222 void __put_net(struct net *net);
224 static inline struct net *get_net(struct net *net)
226 refcount_inc(&net->count);
230 static inline struct net *maybe_get_net(struct net *net)
232 /* Used when we know struct net exists but we
233 * aren't guaranteed a previous reference count
234 * exists. If the reference count is zero this
235 * function fails and returns NULL.
237 if (!refcount_inc_not_zero(&net->count))
242 static inline void put_net(struct net *net)
244 if (refcount_dec_and_test(&net->count))
249 int net_eq(const struct net *net1, const struct net *net2)
254 static inline int check_net(const struct net *net)
256 return refcount_read(&net->count) != 0;
259 void net_drop_ns(void *);
263 static inline struct net *get_net(struct net *net)
268 static inline void put_net(struct net *net)
272 static inline struct net *maybe_get_net(struct net *net)
278 int net_eq(const struct net *net1, const struct net *net2)
283 static inline int check_net(const struct net *net)
288 #define net_drop_ns NULL
298 static inline void write_pnet(possible_net_t *pnet, struct net *net)
305 static inline struct net *read_pnet(const possible_net_t *pnet)
314 /* Protected by net_rwsem */
315 #define for_each_net(VAR) \
316 list_for_each_entry(VAR, &net_namespace_list, list)
318 #define for_each_net_rcu(VAR) \
319 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
324 #define __net_initdata
325 #define __net_initconst
327 #define __net_init __init
328 #define __net_exit __ref
329 #define __net_initdata __initdata
330 #define __net_initconst __initconst
333 int peernet2id_alloc(struct net *net, struct net *peer);
334 int peernet2id(struct net *net, struct net *peer);
335 bool peernet_has_id(struct net *net, struct net *peer);
336 struct net *get_net_ns_by_id(struct net *net, int id);
338 struct pernet_operations {
339 struct list_head list;
341 * Below methods are called without any exclusive locks.
342 * More than one net may be constructed and destructed
343 * in parallel on several cpus. Every pernet_operations
344 * have to keep in mind all other pernet_operations and
345 * to introduce a locking, if they share common resources.
347 * The only time they are called with exclusive lock is
348 * from register_pernet_subsys(), unregister_pernet_subsys()
349 * register_pernet_device() and unregister_pernet_device().
351 * Exit methods using blocking RCU primitives, such as
352 * synchronize_rcu(), should be implemented via exit_batch.
353 * Then, destruction of a group of net requires single
354 * synchronize_rcu() related to these pernet_operations,
355 * instead of separate synchronize_rcu() for every net.
356 * Please, avoid synchronize_rcu() at all, where it's possible.
358 * Note that a combination of pre_exit() and exit() can
359 * be used, since a synchronize_rcu() is guaranteed between
362 int (*init)(struct net *net);
363 void (*pre_exit)(struct net *net);
364 void (*exit)(struct net *net);
365 void (*exit_batch)(struct list_head *net_exit_list);
371 * Use these carefully. If you implement a network device and it
372 * needs per network namespace operations use device pernet operations,
373 * otherwise use pernet subsys operations.
375 * Network interfaces need to be removed from a dying netns _before_
376 * subsys notifiers can be called, as most of the network code cleanup
377 * (which is done from subsys notifiers) runs with the assumption that
378 * dev_remove_pack has been called so no new packets will arrive during
379 * and after the cleanup functions have been called. dev_remove_pack
380 * is not per namespace so instead the guarantee of no more packets
381 * arriving in a network namespace is provided by ensuring that all
382 * network devices and all sockets have left the network namespace
383 * before the cleanup methods are called.
385 * For the longest time the ipv4 icmp code was registered as a pernet
386 * device which caused kernel oops, and panics during network
387 * namespace cleanup. So please don't get this wrong.
389 int register_pernet_subsys(struct pernet_operations *);
390 void unregister_pernet_subsys(struct pernet_operations *);
391 int register_pernet_device(struct pernet_operations *);
392 void unregister_pernet_device(struct pernet_operations *);
395 struct ctl_table_header;
398 int net_sysctl_init(void);
399 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
400 struct ctl_table *table);
401 void unregister_net_sysctl_table(struct ctl_table_header *header);
403 static inline int net_sysctl_init(void) { return 0; }
404 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
405 const char *path, struct ctl_table *table)
409 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
414 static inline int rt_genid_ipv4(struct net *net)
416 return atomic_read(&net->ipv4.rt_genid);
419 static inline void rt_genid_bump_ipv4(struct net *net)
421 atomic_inc(&net->ipv4.rt_genid);
424 extern void (*__fib6_flush_trees)(struct net *net);
425 static inline void rt_genid_bump_ipv6(struct net *net)
427 if (__fib6_flush_trees)
428 __fib6_flush_trees(net);
431 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
432 static inline struct netns_ieee802154_lowpan *
433 net_ieee802154_lowpan(struct net *net)
435 return &net->ieee802154_lowpan;
439 /* For callers who don't really care about whether it's IPv4 or IPv6 */
440 static inline void rt_genid_bump_all(struct net *net)
442 rt_genid_bump_ipv4(net);
443 rt_genid_bump_ipv6(net);
446 static inline int fnhe_genid(struct net *net)
448 return atomic_read(&net->fnhe_genid);
451 static inline void fnhe_genid_bump(struct net *net)
453 atomic_inc(&net->fnhe_genid);
456 #endif /* __NET_NET_NAMESPACE_H */