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 static bool init_net_initialized;
42 #define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */
44 static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS;
46 static struct net_generic *net_alloc_generic(void)
48 struct net_generic *ng;
49 size_t generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]);
51 ng = kzalloc(generic_size, GFP_KERNEL);
53 ng->len = max_gen_ptrs;
58 static int net_assign_generic(struct net *net, unsigned int id, void *data)
60 struct net_generic *ng, *old_ng;
62 BUG_ON(!mutex_is_locked(&net_mutex));
65 old_ng = rcu_dereference_protected(net->gen,
66 lockdep_is_held(&net_mutex));
68 if (old_ng->len >= id)
71 ng = net_alloc_generic();
76 * Some synchronisation notes:
78 * The net_generic explores the net->gen array inside rcu
79 * read section. Besides once set the net->gen->ptr[x]
80 * pointer never changes (see rules in netns/generic.h).
82 * That said, we simply duplicate this array and schedule
83 * the old copy for kfree after a grace period.
86 memcpy(&ng->ptr, &old_ng->ptr, old_ng->len * sizeof(void*));
88 rcu_assign_pointer(net->gen, ng);
89 kfree_rcu(old_ng, rcu);
91 ng->ptr[id - 1] = data;
95 static int ops_init(const struct pernet_operations *ops, struct net *net)
100 if (ops->id && ops->size) {
101 data = kzalloc(ops->size, GFP_KERNEL);
105 err = net_assign_generic(net, *ops->id, data);
111 err = ops->init(net);
122 static void ops_free(const struct pernet_operations *ops, struct net *net)
124 if (ops->id && ops->size) {
125 kfree(net_generic(net, *ops->id));
129 static void ops_exit_list(const struct pernet_operations *ops,
130 struct list_head *net_exit_list)
134 list_for_each_entry(net, net_exit_list, exit_list)
138 ops->exit_batch(net_exit_list);
141 static void ops_free_list(const struct pernet_operations *ops,
142 struct list_head *net_exit_list)
145 if (ops->size && ops->id) {
146 list_for_each_entry(net, net_exit_list, exit_list)
151 /* should be called with nsid_lock held */
152 static int alloc_netid(struct net *net, struct net *peer, int reqid)
154 int min = 0, max = 0;
161 return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC);
164 /* This function is used by idr_for_each(). If net is equal to peer, the
165 * function returns the id so that idr_for_each() stops. Because we cannot
166 * returns the id 0 (idr_for_each() will not stop), we return the magic value
167 * NET_ID_ZERO (-1) for it.
169 #define NET_ID_ZERO -1
170 static int net_eq_idr(int id, void *net, void *peer)
172 if (net_eq(net, peer))
173 return id ? : NET_ID_ZERO;
177 /* Should be called with nsid_lock held. If a new id is assigned, the bool alloc
178 * is set to true, thus the caller knows that the new id must be notified via
181 static int __peernet2id_alloc(struct net *net, struct net *peer, bool *alloc)
183 int id = idr_for_each(&net->netns_ids, net_eq_idr, peer);
184 bool alloc_it = *alloc;
188 /* Magic value for id 0. */
189 if (id == NET_ID_ZERO)
195 id = alloc_netid(net, peer, -1);
197 return id >= 0 ? id : NETNSA_NSID_NOT_ASSIGNED;
200 return NETNSA_NSID_NOT_ASSIGNED;
203 /* should be called with nsid_lock held */
204 static int __peernet2id(struct net *net, struct net *peer)
208 return __peernet2id_alloc(net, peer, &no);
211 static void rtnl_net_notifyid(struct net *net, int cmd, int id);
212 /* This function returns the id of a peer netns. If no id is assigned, one will
213 * be allocated and returned.
215 int peernet2id_alloc(struct net *net, struct net *peer)
221 if (atomic_read(&net->count) == 0)
222 return NETNSA_NSID_NOT_ASSIGNED;
223 spin_lock_irqsave(&net->nsid_lock, flags);
224 alloc = atomic_read(&peer->count) == 0 ? false : true;
225 id = __peernet2id_alloc(net, peer, &alloc);
226 spin_unlock_irqrestore(&net->nsid_lock, flags);
227 if (alloc && id >= 0)
228 rtnl_net_notifyid(net, RTM_NEWNSID, id);
232 /* This function returns, if assigned, the id of a peer netns. */
233 int peernet2id(struct net *net, struct net *peer)
238 spin_lock_irqsave(&net->nsid_lock, flags);
239 id = __peernet2id(net, peer);
240 spin_unlock_irqrestore(&net->nsid_lock, flags);
243 EXPORT_SYMBOL(peernet2id);
245 /* This function returns true is the peer netns has an id assigned into the
248 bool peernet_has_id(struct net *net, struct net *peer)
250 return peernet2id(net, peer) >= 0;
253 struct net *get_net_ns_by_id(struct net *net, int id)
262 spin_lock_irqsave(&net->nsid_lock, flags);
263 peer = idr_find(&net->netns_ids, id);
266 spin_unlock_irqrestore(&net->nsid_lock, flags);
273 * setup_net runs the initializers for the network namespace object.
275 static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
277 /* Must be called with net_mutex held */
278 const struct pernet_operations *ops, *saved_ops;
280 LIST_HEAD(net_exit_list);
282 atomic_set(&net->count, 1);
283 atomic_set(&net->passive, 1);
284 net->dev_base_seq = 1;
285 net->user_ns = user_ns;
286 idr_init(&net->netns_ids);
287 spin_lock_init(&net->nsid_lock);
289 list_for_each_entry(ops, &pernet_list, list) {
290 error = ops_init(ops, net);
298 /* Walk through the list backwards calling the exit functions
299 * for the pernet modules whose init functions did not fail.
301 list_add(&net->exit_list, &net_exit_list);
303 list_for_each_entry_continue_reverse(ops, &pernet_list, list)
304 ops_exit_list(ops, &net_exit_list);
307 list_for_each_entry_continue_reverse(ops, &pernet_list, list)
308 ops_free_list(ops, &net_exit_list);
316 static struct ucounts *inc_net_namespaces(struct user_namespace *ns)
318 return inc_ucount(ns, current_euid(), UCOUNT_NET_NAMESPACES);
321 static void dec_net_namespaces(struct ucounts *ucounts)
323 dec_ucount(ucounts, UCOUNT_NET_NAMESPACES);
326 static struct kmem_cache *net_cachep;
327 static struct workqueue_struct *netns_wq;
329 static struct net *net_alloc(void)
331 struct net *net = NULL;
332 struct net_generic *ng;
334 ng = net_alloc_generic();
338 net = kmem_cache_zalloc(net_cachep, GFP_KERNEL);
342 rcu_assign_pointer(net->gen, ng);
351 static void net_free(struct net *net)
353 kfree(rcu_access_pointer(net->gen));
354 kmem_cache_free(net_cachep, net);
357 void net_drop_ns(void *p)
360 if (ns && atomic_dec_and_test(&ns->passive))
364 struct net *copy_net_ns(unsigned long flags,
365 struct user_namespace *user_ns, struct net *old_net)
367 struct ucounts *ucounts;
371 if (!(flags & CLONE_NEWNET))
372 return get_net(old_net);
374 ucounts = inc_net_namespaces(user_ns);
376 return ERR_PTR(-ENOSPC);
380 dec_net_namespaces(ucounts);
381 return ERR_PTR(-ENOMEM);
384 get_user_ns(user_ns);
386 rv = mutex_lock_killable(&net_mutex);
389 dec_net_namespaces(ucounts);
390 put_user_ns(user_ns);
394 net->ucounts = ucounts;
395 rv = setup_net(net, user_ns);
398 list_add_tail_rcu(&net->list, &net_namespace_list);
401 mutex_unlock(&net_mutex);
403 dec_net_namespaces(ucounts);
404 put_user_ns(user_ns);
411 static DEFINE_SPINLOCK(cleanup_list_lock);
412 static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */
414 static void cleanup_net(struct work_struct *work)
416 const struct pernet_operations *ops;
417 struct net *net, *tmp;
418 struct list_head net_kill_list;
419 LIST_HEAD(net_exit_list);
421 /* Atomically snapshot the list of namespaces to cleanup */
422 spin_lock_irq(&cleanup_list_lock);
423 list_replace_init(&cleanup_list, &net_kill_list);
424 spin_unlock_irq(&cleanup_list_lock);
426 mutex_lock(&net_mutex);
428 /* Don't let anyone else find us. */
430 list_for_each_entry(net, &net_kill_list, cleanup_list) {
431 list_del_rcu(&net->list);
432 list_add_tail(&net->exit_list, &net_exit_list);
436 spin_lock_irq(&tmp->nsid_lock);
437 id = __peernet2id(tmp, net);
439 idr_remove(&tmp->netns_ids, id);
440 spin_unlock_irq(&tmp->nsid_lock);
442 rtnl_net_notifyid(tmp, RTM_DELNSID, id);
444 spin_lock_irq(&net->nsid_lock);
445 idr_destroy(&net->netns_ids);
446 spin_unlock_irq(&net->nsid_lock);
452 * Another CPU might be rcu-iterating the list, wait for it.
453 * This needs to be before calling the exit() notifiers, so
454 * the rcu_barrier() below isn't sufficient alone.
458 /* Run all of the network namespace exit methods */
459 list_for_each_entry_reverse(ops, &pernet_list, list)
460 ops_exit_list(ops, &net_exit_list);
462 /* Free the net generic variables */
463 list_for_each_entry_reverse(ops, &pernet_list, list)
464 ops_free_list(ops, &net_exit_list);
466 mutex_unlock(&net_mutex);
468 /* Ensure there are no outstanding rcu callbacks using this
473 /* Finally it is safe to free my network namespace structure */
474 list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {
475 list_del_init(&net->exit_list);
476 dec_net_namespaces(net->ucounts);
477 put_user_ns(net->user_ns);
481 static DECLARE_WORK(net_cleanup_work, cleanup_net);
483 void __put_net(struct net *net)
485 /* Cleanup the network namespace in process context */
488 spin_lock_irqsave(&cleanup_list_lock, flags);
489 list_add(&net->cleanup_list, &cleanup_list);
490 spin_unlock_irqrestore(&cleanup_list_lock, flags);
492 queue_work(netns_wq, &net_cleanup_work);
494 EXPORT_SYMBOL_GPL(__put_net);
496 struct net *get_net_ns_by_fd(int fd)
499 struct ns_common *ns;
502 file = proc_ns_fget(fd);
504 return ERR_CAST(file);
506 ns = get_proc_ns(file_inode(file));
507 if (ns->ops == &netns_operations)
508 net = get_net(container_of(ns, struct net, ns));
510 net = ERR_PTR(-EINVAL);
517 struct net *get_net_ns_by_fd(int fd)
519 return ERR_PTR(-EINVAL);
522 EXPORT_SYMBOL_GPL(get_net_ns_by_fd);
524 struct net *get_net_ns_by_pid(pid_t pid)
526 struct task_struct *tsk;
529 /* Lookup the network namespace */
530 net = ERR_PTR(-ESRCH);
532 tsk = find_task_by_vpid(pid);
534 struct nsproxy *nsproxy;
536 nsproxy = tsk->nsproxy;
538 net = get_net(nsproxy->net_ns);
544 EXPORT_SYMBOL_GPL(get_net_ns_by_pid);
546 static __net_init int net_ns_net_init(struct net *net)
549 net->ns.ops = &netns_operations;
551 return ns_alloc_inum(&net->ns);
554 static __net_exit void net_ns_net_exit(struct net *net)
556 ns_free_inum(&net->ns);
559 static struct pernet_operations __net_initdata net_ns_ops = {
560 .init = net_ns_net_init,
561 .exit = net_ns_net_exit,
564 static const struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = {
565 [NETNSA_NONE] = { .type = NLA_UNSPEC },
566 [NETNSA_NSID] = { .type = NLA_S32 },
567 [NETNSA_PID] = { .type = NLA_U32 },
568 [NETNSA_FD] = { .type = NLA_U32 },
571 static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
573 struct net *net = sock_net(skb->sk);
574 struct nlattr *tb[NETNSA_MAX + 1];
579 err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX,
583 if (!tb[NETNSA_NSID])
585 nsid = nla_get_s32(tb[NETNSA_NSID]);
588 peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID]));
589 else if (tb[NETNSA_FD])
590 peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD]));
594 return PTR_ERR(peer);
596 spin_lock_irqsave(&net->nsid_lock, flags);
597 if (__peernet2id(net, peer) >= 0) {
598 spin_unlock_irqrestore(&net->nsid_lock, flags);
603 err = alloc_netid(net, peer, nsid);
604 spin_unlock_irqrestore(&net->nsid_lock, flags);
606 rtnl_net_notifyid(net, RTM_NEWNSID, err);
614 static int rtnl_net_get_size(void)
616 return NLMSG_ALIGN(sizeof(struct rtgenmsg))
617 + nla_total_size(sizeof(s32)) /* NETNSA_NSID */
621 static int rtnl_net_fill(struct sk_buff *skb, u32 portid, u32 seq, int flags,
622 int cmd, struct net *net, int nsid)
624 struct nlmsghdr *nlh;
625 struct rtgenmsg *rth;
627 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rth), flags);
631 rth = nlmsg_data(nlh);
632 rth->rtgen_family = AF_UNSPEC;
634 if (nla_put_s32(skb, NETNSA_NSID, nsid))
635 goto nla_put_failure;
641 nlmsg_cancel(skb, nlh);
645 static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh)
647 struct net *net = sock_net(skb->sk);
648 struct nlattr *tb[NETNSA_MAX + 1];
653 err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX,
658 peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID]));
659 else if (tb[NETNSA_FD])
660 peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD]));
665 return PTR_ERR(peer);
667 msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL);
673 id = peernet2id(net, peer);
674 err = rtnl_net_fill(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
675 RTM_NEWNSID, net, id);
679 err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid);
689 struct rtnl_net_dump_cb {
692 struct netlink_callback *cb;
697 static int rtnl_net_dumpid_one(int id, void *peer, void *data)
699 struct rtnl_net_dump_cb *net_cb = (struct rtnl_net_dump_cb *)data;
702 if (net_cb->idx < net_cb->s_idx)
705 ret = rtnl_net_fill(net_cb->skb, NETLINK_CB(net_cb->cb->skb).portid,
706 net_cb->cb->nlh->nlmsg_seq, NLM_F_MULTI,
707 RTM_NEWNSID, net_cb->net, id);
716 static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
718 struct net *net = sock_net(skb->sk);
719 struct rtnl_net_dump_cb net_cb = {
724 .s_idx = cb->args[0],
728 spin_lock_irqsave(&net->nsid_lock, flags);
729 idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);
730 spin_unlock_irqrestore(&net->nsid_lock, flags);
732 cb->args[0] = net_cb.idx;
736 static void rtnl_net_notifyid(struct net *net, int cmd, int id)
741 msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL);
745 err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, id);
749 rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0);
755 rtnl_set_sk_err(net, RTNLGRP_NSID, err);
758 static int __init net_ns_init(void)
760 struct net_generic *ng;
763 net_cachep = kmem_cache_create("net_namespace", sizeof(struct net),
767 /* Create workqueue for cleanup */
768 netns_wq = create_singlethread_workqueue("netns");
770 panic("Could not create netns workq");
773 ng = net_alloc_generic();
775 panic("Could not allocate generic netns");
777 rcu_assign_pointer(init_net.gen, ng);
779 mutex_lock(&net_mutex);
780 if (setup_net(&init_net, &init_user_ns))
781 panic("Could not setup the initial network namespace");
783 init_net_initialized = true;
786 list_add_tail_rcu(&init_net.list, &net_namespace_list);
789 mutex_unlock(&net_mutex);
791 register_pernet_subsys(&net_ns_ops);
793 rtnl_register(PF_UNSPEC, RTM_NEWNSID, rtnl_net_newid, NULL, NULL);
794 rtnl_register(PF_UNSPEC, RTM_GETNSID, rtnl_net_getid, rtnl_net_dumpid,
800 pure_initcall(net_ns_init);
803 static int __register_pernet_operations(struct list_head *list,
804 struct pernet_operations *ops)
808 LIST_HEAD(net_exit_list);
810 list_add_tail(&ops->list, list);
811 if (ops->init || (ops->id && ops->size)) {
813 error = ops_init(ops, net);
816 list_add_tail(&net->exit_list, &net_exit_list);
822 /* If I have an error cleanup all namespaces I initialized */
823 list_del(&ops->list);
824 ops_exit_list(ops, &net_exit_list);
825 ops_free_list(ops, &net_exit_list);
829 static void __unregister_pernet_operations(struct pernet_operations *ops)
832 LIST_HEAD(net_exit_list);
834 list_del(&ops->list);
836 list_add_tail(&net->exit_list, &net_exit_list);
837 ops_exit_list(ops, &net_exit_list);
838 ops_free_list(ops, &net_exit_list);
843 static int __register_pernet_operations(struct list_head *list,
844 struct pernet_operations *ops)
846 if (!init_net_initialized) {
847 list_add_tail(&ops->list, list);
851 return ops_init(ops, &init_net);
854 static void __unregister_pernet_operations(struct pernet_operations *ops)
856 if (!init_net_initialized) {
857 list_del(&ops->list);
859 LIST_HEAD(net_exit_list);
860 list_add(&init_net.exit_list, &net_exit_list);
861 ops_exit_list(ops, &net_exit_list);
862 ops_free_list(ops, &net_exit_list);
866 #endif /* CONFIG_NET_NS */
868 static DEFINE_IDA(net_generic_ids);
870 static int register_pernet_operations(struct list_head *list,
871 struct pernet_operations *ops)
877 error = ida_get_new_above(&net_generic_ids, 1, ops->id);
879 if (error == -EAGAIN) {
880 ida_pre_get(&net_generic_ids, GFP_KERNEL);
885 max_gen_ptrs = max(max_gen_ptrs, *ops->id);
887 error = __register_pernet_operations(list, ops);
891 ida_remove(&net_generic_ids, *ops->id);
897 static void unregister_pernet_operations(struct pernet_operations *ops)
900 __unregister_pernet_operations(ops);
903 ida_remove(&net_generic_ids, *ops->id);
907 * register_pernet_subsys - register a network namespace subsystem
908 * @ops: pernet operations structure for the subsystem
910 * Register a subsystem 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_subsys(struct pernet_operations *ops)
928 mutex_lock(&net_mutex);
929 error = register_pernet_operations(first_device, ops);
930 mutex_unlock(&net_mutex);
933 EXPORT_SYMBOL_GPL(register_pernet_subsys);
936 * unregister_pernet_subsys - unregister a network namespace subsystem
937 * @ops: pernet operations structure to manipulate
939 * Remove the pernet operations structure from the list to be
940 * used when network namespaces are created or destroyed. In
941 * addition run the exit method for all existing network
944 void unregister_pernet_subsys(struct pernet_operations *ops)
946 mutex_lock(&net_mutex);
947 unregister_pernet_operations(ops);
948 mutex_unlock(&net_mutex);
950 EXPORT_SYMBOL_GPL(unregister_pernet_subsys);
953 * register_pernet_device - register a network namespace device
954 * @ops: pernet operations structure for the subsystem
956 * Register a device which has init and exit functions
957 * that are called when network namespaces are created and
958 * destroyed respectively.
960 * When registered all network namespace init functions are
961 * called for every existing network namespace. Allowing kernel
962 * modules to have a race free view of the set of network namespaces.
964 * When a new network namespace is created all of the init
965 * methods are called in the order in which they were registered.
967 * When a network namespace is destroyed all of the exit methods
968 * are called in the reverse of the order with which they were
971 int register_pernet_device(struct pernet_operations *ops)
974 mutex_lock(&net_mutex);
975 error = register_pernet_operations(&pernet_list, ops);
976 if (!error && (first_device == &pernet_list))
977 first_device = &ops->list;
978 mutex_unlock(&net_mutex);
981 EXPORT_SYMBOL_GPL(register_pernet_device);
984 * unregister_pernet_device - unregister a network namespace netdevice
985 * @ops: pernet operations structure to manipulate
987 * Remove the pernet operations structure from the list to be
988 * used when network namespaces are created or destroyed. In
989 * addition run the exit method for all existing network
992 void unregister_pernet_device(struct pernet_operations *ops)
994 mutex_lock(&net_mutex);
995 if (&ops->list == first_device)
996 first_device = first_device->next;
997 unregister_pernet_operations(ops);
998 mutex_unlock(&net_mutex);
1000 EXPORT_SYMBOL_GPL(unregister_pernet_device);
1002 #ifdef CONFIG_NET_NS
1003 static struct ns_common *netns_get(struct task_struct *task)
1005 struct net *net = NULL;
1006 struct nsproxy *nsproxy;
1009 nsproxy = task->nsproxy;
1011 net = get_net(nsproxy->net_ns);
1014 return net ? &net->ns : NULL;
1017 static inline struct net *to_net_ns(struct ns_common *ns)
1019 return container_of(ns, struct net, ns);
1022 static void netns_put(struct ns_common *ns)
1024 put_net(to_net_ns(ns));
1027 static int netns_install(struct nsproxy *nsproxy, struct ns_common *ns)
1029 struct net *net = to_net_ns(ns);
1031 if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) ||
1032 !ns_capable(current_user_ns(), CAP_SYS_ADMIN))
1035 put_net(nsproxy->net_ns);
1036 nsproxy->net_ns = get_net(net);
1040 static struct user_namespace *netns_owner(struct ns_common *ns)
1042 return to_net_ns(ns)->user_ns;
1045 const struct proc_ns_operations netns_operations = {
1047 .type = CLONE_NEWNET,
1050 .install = netns_install,
1051 .owner = netns_owner,