1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3 #include <linux/workqueue.h>
4 #include <linux/rtnetlink.h>
5 #include <linux/cache.h>
6 #include <linux/slab.h>
7 #include <linux/list.h>
8 #include <linux/delay.h>
9 #include <linux/sched.h>
10 #include <linux/idr.h>
11 #include <linux/rculist.h>
12 #include <linux/nsproxy.h>
14 #include <linux/proc_ns.h>
15 #include <linux/file.h>
16 #include <linux/export.h>
17 #include <linux/user_namespace.h>
18 #include <linux/net_namespace.h>
20 #include <net/netlink.h>
21 #include <net/net_namespace.h>
22 #include <net/netns/generic.h>
25 * Our network namespace constructor/destructor lists
28 static LIST_HEAD(pernet_list
);
29 static struct list_head
*first_device
= &pernet_list
;
30 DEFINE_MUTEX(net_mutex
);
32 LIST_HEAD(net_namespace_list
);
33 EXPORT_SYMBOL_GPL(net_namespace_list
);
35 struct net init_net
= {
36 .dev_base_head
= LIST_HEAD_INIT(init_net
.dev_base_head
),
38 EXPORT_SYMBOL(init_net
);
40 #define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */
42 static unsigned int max_gen_ptrs
= INITIAL_NET_GEN_PTRS
;
44 static struct net_generic
*net_alloc_generic(void)
46 struct net_generic
*ng
;
47 size_t generic_size
= offsetof(struct net_generic
, ptr
[max_gen_ptrs
]);
49 ng
= kzalloc(generic_size
, GFP_KERNEL
);
51 ng
->len
= max_gen_ptrs
;
56 static int net_assign_generic(struct net
*net
, int id
, void *data
)
58 struct net_generic
*ng
, *old_ng
;
60 BUG_ON(!mutex_is_locked(&net_mutex
));
63 old_ng
= rcu_dereference_protected(net
->gen
,
64 lockdep_is_held(&net_mutex
));
66 if (old_ng
->len
>= id
)
69 ng
= net_alloc_generic();
74 * Some synchronisation notes:
76 * The net_generic explores the net->gen array inside rcu
77 * read section. Besides once set the net->gen->ptr[x]
78 * pointer never changes (see rules in netns/generic.h).
80 * That said, we simply duplicate this array and schedule
81 * the old copy for kfree after a grace period.
84 memcpy(&ng
->ptr
, &old_ng
->ptr
, old_ng
->len
* sizeof(void*));
86 rcu_assign_pointer(net
->gen
, ng
);
87 kfree_rcu(old_ng
, rcu
);
89 ng
->ptr
[id
- 1] = data
;
93 static int ops_init(const struct pernet_operations
*ops
, struct net
*net
)
98 if (ops
->id
&& ops
->size
) {
99 data
= kzalloc(ops
->size
, GFP_KERNEL
);
103 err
= net_assign_generic(net
, *ops
->id
, data
);
109 err
= ops
->init(net
);
120 static void ops_free(const struct pernet_operations
*ops
, struct net
*net
)
122 if (ops
->id
&& ops
->size
) {
124 kfree(net_generic(net
, id
));
128 static void ops_exit_list(const struct pernet_operations
*ops
,
129 struct list_head
*net_exit_list
)
133 list_for_each_entry(net
, net_exit_list
, exit_list
)
137 ops
->exit_batch(net_exit_list
);
140 static void ops_free_list(const struct pernet_operations
*ops
,
141 struct list_head
*net_exit_list
)
144 if (ops
->size
&& ops
->id
) {
145 list_for_each_entry(net
, net_exit_list
, exit_list
)
150 /* should be called with nsid_lock held */
151 static int alloc_netid(struct net
*net
, struct net
*peer
, int reqid
)
153 int min
= 0, max
= 0;
160 return idr_alloc(&net
->netns_ids
, peer
, min
, max
, GFP_ATOMIC
);
163 /* This function is used by idr_for_each(). If net is equal to peer, the
164 * function returns the id so that idr_for_each() stops. Because we cannot
165 * returns the id 0 (idr_for_each() will not stop), we return the magic value
166 * NET_ID_ZERO (-1) for it.
168 #define NET_ID_ZERO -1
169 static int net_eq_idr(int id
, void *net
, void *peer
)
171 if (net_eq(net
, peer
))
172 return id
? : NET_ID_ZERO
;
176 /* Should be called with nsid_lock held. If a new id is assigned, the bool alloc
177 * is set to true, thus the caller knows that the new id must be notified via
180 static int __peernet2id_alloc(struct net
*net
, struct net
*peer
, bool *alloc
)
182 int id
= idr_for_each(&net
->netns_ids
, net_eq_idr
, peer
);
183 bool alloc_it
= *alloc
;
187 /* Magic value for id 0. */
188 if (id
== NET_ID_ZERO
)
194 id
= alloc_netid(net
, peer
, -1);
196 return id
>= 0 ? id
: NETNSA_NSID_NOT_ASSIGNED
;
199 return NETNSA_NSID_NOT_ASSIGNED
;
202 /* should be called with nsid_lock held */
203 static int __peernet2id(struct net
*net
, struct net
*peer
)
207 return __peernet2id_alloc(net
, peer
, &no
);
210 static void rtnl_net_notifyid(struct net
*net
, int cmd
, int id
);
211 /* This function returns the id of a peer netns. If no id is assigned, one will
212 * be allocated and returned.
214 int peernet2id_alloc(struct net
*net
, struct net
*peer
)
219 spin_lock_bh(&net
->nsid_lock
);
220 alloc
= atomic_read(&peer
->count
) == 0 ? false : true;
221 id
= __peernet2id_alloc(net
, peer
, &alloc
);
222 spin_unlock_bh(&net
->nsid_lock
);
223 if (alloc
&& id
>= 0)
224 rtnl_net_notifyid(net
, RTM_NEWNSID
, id
);
227 EXPORT_SYMBOL(peernet2id_alloc
);
229 /* This function returns, if assigned, the id of a peer netns. */
230 int peernet2id(struct net
*net
, struct net
*peer
)
234 spin_lock_bh(&net
->nsid_lock
);
235 id
= __peernet2id(net
, peer
);
236 spin_unlock_bh(&net
->nsid_lock
);
240 /* This function returns true is the peer netns has an id assigned into the
243 bool peernet_has_id(struct net
*net
, struct net
*peer
)
245 return peernet2id(net
, peer
) >= 0;
248 struct net
*get_net_ns_by_id(struct net
*net
, int id
)
256 spin_lock_bh(&net
->nsid_lock
);
257 peer
= idr_find(&net
->netns_ids
, id
);
260 spin_unlock_bh(&net
->nsid_lock
);
267 * setup_net runs the initializers for the network namespace object.
269 static __net_init
int setup_net(struct net
*net
, struct user_namespace
*user_ns
)
271 /* Must be called with net_mutex held */
272 const struct pernet_operations
*ops
, *saved_ops
;
274 LIST_HEAD(net_exit_list
);
276 atomic_set(&net
->count
, 1);
277 atomic_set(&net
->passive
, 1);
278 net
->dev_base_seq
= 1;
279 net
->user_ns
= user_ns
;
280 idr_init(&net
->netns_ids
);
281 spin_lock_init(&net
->nsid_lock
);
283 list_for_each_entry(ops
, &pernet_list
, list
) {
284 error
= ops_init(ops
, net
);
292 /* Walk through the list backwards calling the exit functions
293 * for the pernet modules whose init functions did not fail.
295 list_add(&net
->exit_list
, &net_exit_list
);
297 list_for_each_entry_continue_reverse(ops
, &pernet_list
, list
)
298 ops_exit_list(ops
, &net_exit_list
);
301 list_for_each_entry_continue_reverse(ops
, &pernet_list
, list
)
302 ops_free_list(ops
, &net_exit_list
);
310 static struct kmem_cache
*net_cachep
;
311 static struct workqueue_struct
*netns_wq
;
313 static struct net
*net_alloc(void)
315 struct net
*net
= NULL
;
316 struct net_generic
*ng
;
318 ng
= net_alloc_generic();
322 net
= kmem_cache_zalloc(net_cachep
, GFP_KERNEL
);
326 rcu_assign_pointer(net
->gen
, ng
);
335 static void net_free(struct net
*net
)
337 kfree(rcu_access_pointer(net
->gen
));
338 kmem_cache_free(net_cachep
, net
);
341 void net_drop_ns(void *p
)
344 if (ns
&& atomic_dec_and_test(&ns
->passive
))
348 struct net
*copy_net_ns(unsigned long flags
,
349 struct user_namespace
*user_ns
, struct net
*old_net
)
354 if (!(flags
& CLONE_NEWNET
))
355 return get_net(old_net
);
359 return ERR_PTR(-ENOMEM
);
361 get_user_ns(user_ns
);
363 mutex_lock(&net_mutex
);
364 rv
= setup_net(net
, user_ns
);
367 list_add_tail_rcu(&net
->list
, &net_namespace_list
);
370 mutex_unlock(&net_mutex
);
372 put_user_ns(user_ns
);
379 static DEFINE_SPINLOCK(cleanup_list_lock
);
380 static LIST_HEAD(cleanup_list
); /* Must hold cleanup_list_lock to touch */
382 static void cleanup_net(struct work_struct
*work
)
384 const struct pernet_operations
*ops
;
385 struct net
*net
, *tmp
;
386 struct list_head net_kill_list
;
387 LIST_HEAD(net_exit_list
);
389 /* Atomically snapshot the list of namespaces to cleanup */
390 spin_lock_irq(&cleanup_list_lock
);
391 list_replace_init(&cleanup_list
, &net_kill_list
);
392 spin_unlock_irq(&cleanup_list_lock
);
394 mutex_lock(&net_mutex
);
396 /* Don't let anyone else find us. */
398 list_for_each_entry(net
, &net_kill_list
, cleanup_list
) {
399 list_del_rcu(&net
->list
);
400 list_add_tail(&net
->exit_list
, &net_exit_list
);
404 spin_lock_bh(&tmp
->nsid_lock
);
405 id
= __peernet2id(tmp
, net
);
407 idr_remove(&tmp
->netns_ids
, id
);
408 spin_unlock_bh(&tmp
->nsid_lock
);
410 rtnl_net_notifyid(tmp
, RTM_DELNSID
, id
);
412 spin_lock_bh(&net
->nsid_lock
);
413 idr_destroy(&net
->netns_ids
);
414 spin_unlock_bh(&net
->nsid_lock
);
420 * Another CPU might be rcu-iterating the list, wait for it.
421 * This needs to be before calling the exit() notifiers, so
422 * the rcu_barrier() below isn't sufficient alone.
426 /* Run all of the network namespace exit methods */
427 list_for_each_entry_reverse(ops
, &pernet_list
, list
)
428 ops_exit_list(ops
, &net_exit_list
);
430 /* Free the net generic variables */
431 list_for_each_entry_reverse(ops
, &pernet_list
, list
)
432 ops_free_list(ops
, &net_exit_list
);
434 mutex_unlock(&net_mutex
);
436 /* Ensure there are no outstanding rcu callbacks using this
441 /* Finally it is safe to free my network namespace structure */
442 list_for_each_entry_safe(net
, tmp
, &net_exit_list
, exit_list
) {
443 list_del_init(&net
->exit_list
);
444 put_user_ns(net
->user_ns
);
448 static DECLARE_WORK(net_cleanup_work
, cleanup_net
);
450 void __put_net(struct net
*net
)
452 /* Cleanup the network namespace in process context */
455 spin_lock_irqsave(&cleanup_list_lock
, flags
);
456 list_add(&net
->cleanup_list
, &cleanup_list
);
457 spin_unlock_irqrestore(&cleanup_list_lock
, flags
);
459 queue_work(netns_wq
, &net_cleanup_work
);
461 EXPORT_SYMBOL_GPL(__put_net
);
463 struct net
*get_net_ns_by_fd(int fd
)
466 struct ns_common
*ns
;
469 file
= proc_ns_fget(fd
);
471 return ERR_CAST(file
);
473 ns
= get_proc_ns(file_inode(file
));
474 if (ns
->ops
== &netns_operations
)
475 net
= get_net(container_of(ns
, struct net
, ns
));
477 net
= ERR_PTR(-EINVAL
);
484 struct net
*get_net_ns_by_fd(int fd
)
486 return ERR_PTR(-EINVAL
);
489 EXPORT_SYMBOL_GPL(get_net_ns_by_fd
);
491 struct net
*get_net_ns_by_pid(pid_t pid
)
493 struct task_struct
*tsk
;
496 /* Lookup the network namespace */
497 net
= ERR_PTR(-ESRCH
);
499 tsk
= find_task_by_vpid(pid
);
501 struct nsproxy
*nsproxy
;
503 nsproxy
= tsk
->nsproxy
;
505 net
= get_net(nsproxy
->net_ns
);
511 EXPORT_SYMBOL_GPL(get_net_ns_by_pid
);
513 static __net_init
int net_ns_net_init(struct net
*net
)
516 net
->ns
.ops
= &netns_operations
;
518 return ns_alloc_inum(&net
->ns
);
521 static __net_exit
void net_ns_net_exit(struct net
*net
)
523 ns_free_inum(&net
->ns
);
526 static struct pernet_operations __net_initdata net_ns_ops
= {
527 .init
= net_ns_net_init
,
528 .exit
= net_ns_net_exit
,
531 static struct nla_policy rtnl_net_policy
[NETNSA_MAX
+ 1] = {
532 [NETNSA_NONE
] = { .type
= NLA_UNSPEC
},
533 [NETNSA_NSID
] = { .type
= NLA_S32
},
534 [NETNSA_PID
] = { .type
= NLA_U32
},
535 [NETNSA_FD
] = { .type
= NLA_U32
},
538 static int rtnl_net_newid(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
540 struct net
*net
= sock_net(skb
->sk
);
541 struct nlattr
*tb
[NETNSA_MAX
+ 1];
545 err
= nlmsg_parse(nlh
, sizeof(struct rtgenmsg
), tb
, NETNSA_MAX
,
549 if (!tb
[NETNSA_NSID
])
551 nsid
= nla_get_s32(tb
[NETNSA_NSID
]);
554 peer
= get_net_ns_by_pid(nla_get_u32(tb
[NETNSA_PID
]));
555 else if (tb
[NETNSA_FD
])
556 peer
= get_net_ns_by_fd(nla_get_u32(tb
[NETNSA_FD
]));
560 return PTR_ERR(peer
);
562 spin_lock_bh(&net
->nsid_lock
);
563 if (__peernet2id(net
, peer
) >= 0) {
564 spin_unlock_bh(&net
->nsid_lock
);
569 err
= alloc_netid(net
, peer
, nsid
);
570 spin_unlock_bh(&net
->nsid_lock
);
572 rtnl_net_notifyid(net
, RTM_NEWNSID
, err
);
580 static int rtnl_net_get_size(void)
582 return NLMSG_ALIGN(sizeof(struct rtgenmsg
))
583 + nla_total_size(sizeof(s32
)) /* NETNSA_NSID */
587 static int rtnl_net_fill(struct sk_buff
*skb
, u32 portid
, u32 seq
, int flags
,
588 int cmd
, struct net
*net
, int nsid
)
590 struct nlmsghdr
*nlh
;
591 struct rtgenmsg
*rth
;
593 nlh
= nlmsg_put(skb
, portid
, seq
, cmd
, sizeof(*rth
), flags
);
597 rth
= nlmsg_data(nlh
);
598 rth
->rtgen_family
= AF_UNSPEC
;
600 if (nla_put_s32(skb
, NETNSA_NSID
, nsid
))
601 goto nla_put_failure
;
607 nlmsg_cancel(skb
, nlh
);
611 static int rtnl_net_getid(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
613 struct net
*net
= sock_net(skb
->sk
);
614 struct nlattr
*tb
[NETNSA_MAX
+ 1];
619 err
= nlmsg_parse(nlh
, sizeof(struct rtgenmsg
), tb
, NETNSA_MAX
,
624 peer
= get_net_ns_by_pid(nla_get_u32(tb
[NETNSA_PID
]));
625 else if (tb
[NETNSA_FD
])
626 peer
= get_net_ns_by_fd(nla_get_u32(tb
[NETNSA_FD
]));
631 return PTR_ERR(peer
);
633 msg
= nlmsg_new(rtnl_net_get_size(), GFP_KERNEL
);
639 id
= peernet2id(net
, peer
);
640 err
= rtnl_net_fill(msg
, NETLINK_CB(skb
).portid
, nlh
->nlmsg_seq
, 0,
641 RTM_NEWNSID
, net
, id
);
645 err
= rtnl_unicast(msg
, net
, NETLINK_CB(skb
).portid
);
655 struct rtnl_net_dump_cb
{
658 struct netlink_callback
*cb
;
663 static int rtnl_net_dumpid_one(int id
, void *peer
, void *data
)
665 struct rtnl_net_dump_cb
*net_cb
= (struct rtnl_net_dump_cb
*)data
;
668 if (net_cb
->idx
< net_cb
->s_idx
)
671 ret
= rtnl_net_fill(net_cb
->skb
, NETLINK_CB(net_cb
->cb
->skb
).portid
,
672 net_cb
->cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
673 RTM_NEWNSID
, net_cb
->net
, id
);
682 static int rtnl_net_dumpid(struct sk_buff
*skb
, struct netlink_callback
*cb
)
684 struct net
*net
= sock_net(skb
->sk
);
685 struct rtnl_net_dump_cb net_cb
= {
690 .s_idx
= cb
->args
[0],
693 spin_lock_bh(&net
->nsid_lock
);
694 idr_for_each(&net
->netns_ids
, rtnl_net_dumpid_one
, &net_cb
);
695 spin_unlock_bh(&net
->nsid_lock
);
697 cb
->args
[0] = net_cb
.idx
;
701 static void rtnl_net_notifyid(struct net
*net
, int cmd
, int id
)
706 msg
= nlmsg_new(rtnl_net_get_size(), GFP_KERNEL
);
710 err
= rtnl_net_fill(msg
, 0, 0, 0, cmd
, net
, id
);
714 rtnl_notify(msg
, net
, 0, RTNLGRP_NSID
, NULL
, 0);
720 rtnl_set_sk_err(net
, RTNLGRP_NSID
, err
);
723 static int __init
net_ns_init(void)
725 struct net_generic
*ng
;
728 net_cachep
= kmem_cache_create("net_namespace", sizeof(struct net
),
732 /* Create workqueue for cleanup */
733 netns_wq
= create_singlethread_workqueue("netns");
735 panic("Could not create netns workq");
738 ng
= net_alloc_generic();
740 panic("Could not allocate generic netns");
742 rcu_assign_pointer(init_net
.gen
, ng
);
744 mutex_lock(&net_mutex
);
745 if (setup_net(&init_net
, &init_user_ns
))
746 panic("Could not setup the initial network namespace");
749 list_add_tail_rcu(&init_net
.list
, &net_namespace_list
);
752 mutex_unlock(&net_mutex
);
754 register_pernet_subsys(&net_ns_ops
);
756 rtnl_register(PF_UNSPEC
, RTM_NEWNSID
, rtnl_net_newid
, NULL
, NULL
);
757 rtnl_register(PF_UNSPEC
, RTM_GETNSID
, rtnl_net_getid
, rtnl_net_dumpid
,
763 pure_initcall(net_ns_init
);
766 static int __register_pernet_operations(struct list_head
*list
,
767 struct pernet_operations
*ops
)
771 LIST_HEAD(net_exit_list
);
773 list_add_tail(&ops
->list
, list
);
774 if (ops
->init
|| (ops
->id
&& ops
->size
)) {
776 error
= ops_init(ops
, net
);
779 list_add_tail(&net
->exit_list
, &net_exit_list
);
785 /* If I have an error cleanup all namespaces I initialized */
786 list_del(&ops
->list
);
787 ops_exit_list(ops
, &net_exit_list
);
788 ops_free_list(ops
, &net_exit_list
);
792 static void __unregister_pernet_operations(struct pernet_operations
*ops
)
795 LIST_HEAD(net_exit_list
);
797 list_del(&ops
->list
);
799 list_add_tail(&net
->exit_list
, &net_exit_list
);
800 ops_exit_list(ops
, &net_exit_list
);
801 ops_free_list(ops
, &net_exit_list
);
806 static int __register_pernet_operations(struct list_head
*list
,
807 struct pernet_operations
*ops
)
809 return ops_init(ops
, &init_net
);
812 static void __unregister_pernet_operations(struct pernet_operations
*ops
)
814 LIST_HEAD(net_exit_list
);
815 list_add(&init_net
.exit_list
, &net_exit_list
);
816 ops_exit_list(ops
, &net_exit_list
);
817 ops_free_list(ops
, &net_exit_list
);
820 #endif /* CONFIG_NET_NS */
822 static DEFINE_IDA(net_generic_ids
);
824 static int register_pernet_operations(struct list_head
*list
,
825 struct pernet_operations
*ops
)
831 error
= ida_get_new_above(&net_generic_ids
, 1, ops
->id
);
833 if (error
== -EAGAIN
) {
834 ida_pre_get(&net_generic_ids
, GFP_KERNEL
);
839 max_gen_ptrs
= max_t(unsigned int, max_gen_ptrs
, *ops
->id
);
841 error
= __register_pernet_operations(list
, ops
);
845 ida_remove(&net_generic_ids
, *ops
->id
);
851 static void unregister_pernet_operations(struct pernet_operations
*ops
)
854 __unregister_pernet_operations(ops
);
857 ida_remove(&net_generic_ids
, *ops
->id
);
861 * register_pernet_subsys - register a network namespace subsystem
862 * @ops: pernet operations structure for the subsystem
864 * Register a subsystem which has init and exit functions
865 * that are called when network namespaces are created and
866 * destroyed respectively.
868 * When registered all network namespace init functions are
869 * called for every existing network namespace. Allowing kernel
870 * modules to have a race free view of the set of network namespaces.
872 * When a new network namespace is created all of the init
873 * methods are called in the order in which they were registered.
875 * When a network namespace is destroyed all of the exit methods
876 * are called in the reverse of the order with which they were
879 int register_pernet_subsys(struct pernet_operations
*ops
)
882 mutex_lock(&net_mutex
);
883 error
= register_pernet_operations(first_device
, ops
);
884 mutex_unlock(&net_mutex
);
887 EXPORT_SYMBOL_GPL(register_pernet_subsys
);
890 * unregister_pernet_subsys - unregister a network namespace subsystem
891 * @ops: pernet operations structure to manipulate
893 * Remove the pernet operations structure from the list to be
894 * used when network namespaces are created or destroyed. In
895 * addition run the exit method for all existing network
898 void unregister_pernet_subsys(struct pernet_operations
*ops
)
900 mutex_lock(&net_mutex
);
901 unregister_pernet_operations(ops
);
902 mutex_unlock(&net_mutex
);
904 EXPORT_SYMBOL_GPL(unregister_pernet_subsys
);
907 * register_pernet_device - register a network namespace device
908 * @ops: pernet operations structure for the subsystem
910 * Register a device which has init and exit functions
911 * that are called when network namespaces are created and
912 * destroyed respectively.
914 * When registered all network namespace init functions are
915 * called for every existing network namespace. Allowing kernel
916 * modules to have a race free view of the set of network namespaces.
918 * When a new network namespace is created all of the init
919 * methods are called in the order in which they were registered.
921 * When a network namespace is destroyed all of the exit methods
922 * are called in the reverse of the order with which they were
925 int register_pernet_device(struct pernet_operations
*ops
)
928 mutex_lock(&net_mutex
);
929 error
= register_pernet_operations(&pernet_list
, ops
);
930 if (!error
&& (first_device
== &pernet_list
))
931 first_device
= &ops
->list
;
932 mutex_unlock(&net_mutex
);
935 EXPORT_SYMBOL_GPL(register_pernet_device
);
938 * unregister_pernet_device - unregister a network namespace netdevice
939 * @ops: pernet operations structure to manipulate
941 * Remove the pernet operations structure from the list to be
942 * used when network namespaces are created or destroyed. In
943 * addition run the exit method for all existing network
946 void unregister_pernet_device(struct pernet_operations
*ops
)
948 mutex_lock(&net_mutex
);
949 if (&ops
->list
== first_device
)
950 first_device
= first_device
->next
;
951 unregister_pernet_operations(ops
);
952 mutex_unlock(&net_mutex
);
954 EXPORT_SYMBOL_GPL(unregister_pernet_device
);
957 static struct ns_common
*netns_get(struct task_struct
*task
)
959 struct net
*net
= NULL
;
960 struct nsproxy
*nsproxy
;
963 nsproxy
= task
->nsproxy
;
965 net
= get_net(nsproxy
->net_ns
);
968 return net
? &net
->ns
: NULL
;
971 static inline struct net
*to_net_ns(struct ns_common
*ns
)
973 return container_of(ns
, struct net
, ns
);
976 static void netns_put(struct ns_common
*ns
)
978 put_net(to_net_ns(ns
));
981 static int netns_install(struct nsproxy
*nsproxy
, struct ns_common
*ns
)
983 struct net
*net
= to_net_ns(ns
);
985 if (!ns_capable(net
->user_ns
, CAP_SYS_ADMIN
) ||
986 !ns_capable(current_user_ns(), CAP_SYS_ADMIN
))
989 put_net(nsproxy
->net_ns
);
990 nsproxy
->net_ns
= get_net(net
);
994 const struct proc_ns_operations netns_operations
= {
996 .type
= CLONE_NEWNET
,
999 .install
= netns_install
,