35 struct net init_net = {
56 static int net_assign_generic(struct net *net, int id, void *data)  in net_assign_generic()  argument
63 	old_ng = rcu_dereference_protected(net->gen,  in net_assign_generic()
86 	rcu_assign_pointer(net->gen, ng);  in net_assign_generic()
93 static int ops_init(const struct pernet_operations *ops, struct net *net)  in ops_init()  argument
103 		err = net_assign_generic(net, *ops->id, data);  in ops_init()
109 		err = ops->init(net);  in ops_init()
120 static void ops_free(const struct pernet_operations *ops, struct net *net)  in ops_free()  argument
124 		kfree(net_generic(net, id));  in ops_free()
131 	struct net *net;  in ops_exit_list()  local
133 		list_for_each_entry(net, net_exit_list, exit_list)  in ops_exit_list()
134 			ops->exit(net);  in ops_exit_list()
143 	struct net *net;  in ops_free_list()  local
145 		list_for_each_entry(net, net_exit_list, exit_list)  in ops_free_list()
146 			ops_free(ops, net);  in ops_free_list()
151 static int alloc_netid(struct net *net, struct net *peer, int reqid)  in alloc_netid()  argument
160 	return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC);  in alloc_netid()
169 static int net_eq_idr(int id, void *net, void *peer)  in net_eq_idr()  argument
171 	if (net_eq(net, peer))  in net_eq_idr()
180 static int __peernet2id_alloc(struct net *net, struct net *peer, bool *alloc)  in __peernet2id_alloc()  argument
182 	int id = idr_for_each(&net->netns_ids, net_eq_idr, peer);  in __peernet2id_alloc()
194 		id = alloc_netid(net, peer, -1);  in __peernet2id_alloc()
203 static int __peernet2id(struct net *net, struct net *peer)  in __peernet2id()  argument
207 	return __peernet2id_alloc(net, peer, &no);  in __peernet2id()
210 static void rtnl_net_notifyid(struct net *net, int cmd, int id);
214 int peernet2id_alloc(struct net *net, struct net *peer)  in peernet2id_alloc()  argument
220 	spin_lock_irqsave(&net->nsid_lock, flags);  in peernet2id_alloc()
222 	id = __peernet2id_alloc(net, peer, &alloc);  in peernet2id_alloc()
223 	spin_unlock_irqrestore(&net->nsid_lock, flags);  in peernet2id_alloc()
225 		rtnl_net_notifyid(net, RTM_NEWNSID, id);  in peernet2id_alloc()
231 int peernet2id(struct net *net, struct net *peer)  in peernet2id()  argument
236 	spin_lock_irqsave(&net->nsid_lock, flags);  in peernet2id()
237 	id = __peernet2id(net, peer);  in peernet2id()
238 	spin_unlock_irqrestore(&net->nsid_lock, flags);  in peernet2id()
245 bool peernet_has_id(struct net *net, struct net *peer)  in peernet_has_id()  argument
247 	return peernet2id(net, peer) >= 0;  in peernet_has_id()
250 struct net *get_net_ns_by_id(struct net *net, int id)  in get_net_ns_by_id()  argument
253 	struct net *peer;  in get_net_ns_by_id()
259 	spin_lock_irqsave(&net->nsid_lock, flags);  in get_net_ns_by_id()
260 	peer = idr_find(&net->netns_ids, id);  in get_net_ns_by_id()
263 	spin_unlock_irqrestore(&net->nsid_lock, flags);  in get_net_ns_by_id()
272 static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)  in setup_net()  argument
279 	atomic_set(&net->count, 1);  in setup_net()
280 	atomic_set(&net->passive, 1);  in setup_net()
281 	net->dev_base_seq = 1;  in setup_net()
282 	net->user_ns = user_ns;  in setup_net()
283 	idr_init(&net->netns_ids);  in setup_net()
284 	spin_lock_init(&net->nsid_lock);  in setup_net()
287 		error = ops_init(ops, net);  in setup_net()
298 	list_add(&net->exit_list, &net_exit_list);  in setup_net()
316 static struct net *net_alloc(void)  in net_alloc()
318 	struct net *net = NULL;  in net_alloc()  local
325 	net = kmem_cache_zalloc(net_cachep, GFP_KERNEL);  in net_alloc()
326 	if (!net)  in net_alloc()
329 	rcu_assign_pointer(net->gen, ng);  in net_alloc()
331 	return net;  in net_alloc()
338 static void net_free(struct net *net)  in net_free()  argument
340 	kfree(rcu_access_pointer(net->gen));  in net_free()
341 	kmem_cache_free(net_cachep, net);  in net_free()
346 	struct net *ns = p;  in net_drop_ns()
351 struct net *copy_net_ns(unsigned long flags,  in copy_net_ns()
352 			struct user_namespace *user_ns, struct net *old_net)  in copy_net_ns()
354 	struct net *net;  in copy_net_ns()  local
360 	net = net_alloc();  in copy_net_ns()
361 	if (!net)  in copy_net_ns()
367 	rv = setup_net(net, user_ns);  in copy_net_ns()
370 		list_add_tail_rcu(&net->list, &net_namespace_list);  in copy_net_ns()
376 		net_drop_ns(net);  in copy_net_ns()
379 	return net;  in copy_net_ns()
388 	struct net *net, *tmp;  in cleanup_net()  local
401 	list_for_each_entry(net, &net_kill_list, cleanup_list) {  in cleanup_net()
402 		list_del_rcu(&net->list);  in cleanup_net()
403 		list_add_tail(&net->exit_list, &net_exit_list);  in cleanup_net()
408 			id = __peernet2id(tmp, net);  in cleanup_net()
415 		spin_lock_irq(&net->nsid_lock);  in cleanup_net()
416 		idr_destroy(&net->netns_ids);  in cleanup_net()
417 		spin_unlock_irq(&net->nsid_lock);  in cleanup_net()
445 	list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {  in cleanup_net()
446 		list_del_init(&net->exit_list);  in cleanup_net()
447 		put_user_ns(net->user_ns);  in cleanup_net()
448 		net_drop_ns(net);  in cleanup_net()
453 void __put_net(struct net *net)  in __put_net()  argument
459 	list_add(&net->cleanup_list, &cleanup_list);  in __put_net()
466 struct net *get_net_ns_by_fd(int fd)  in get_net_ns_by_fd()
470 	struct net *net;  in get_net_ns_by_fd()  local
478 		net = get_net(container_of(ns, struct net, ns));  in get_net_ns_by_fd()
480 		net = ERR_PTR(-EINVAL);  in get_net_ns_by_fd()
483 	return net;  in get_net_ns_by_fd()
487 struct net *get_net_ns_by_fd(int fd)  in get_net_ns_by_fd()
494 struct net *get_net_ns_by_pid(pid_t pid)  in get_net_ns_by_pid()
497 	struct net *net;  in get_net_ns_by_pid()  local
500 	net = ERR_PTR(-ESRCH);  in get_net_ns_by_pid()
508 			net = get_net(nsproxy->net_ns);  in get_net_ns_by_pid()
512 	return net;  in get_net_ns_by_pid()
516 static __net_init int net_ns_net_init(struct net *net)  in net_ns_net_init()  argument
519 	net->ns.ops = &netns_operations;  in net_ns_net_init()
521 	return ns_alloc_inum(&net->ns);  in net_ns_net_init()
524 static __net_exit void net_ns_net_exit(struct net *net)  in net_ns_net_exit()  argument
526 	ns_free_inum(&net->ns);  in net_ns_net_exit()
543 	struct net *net = sock_net(skb->sk);  in rtnl_net_newid()  local
546 	struct net *peer;  in rtnl_net_newid()
566 	spin_lock_irqsave(&net->nsid_lock, flags);  in rtnl_net_newid()
567 	if (__peernet2id(net, peer) >= 0) {  in rtnl_net_newid()
568 		spin_unlock_irqrestore(&net->nsid_lock, flags);  in rtnl_net_newid()
573 	err = alloc_netid(net, peer, nsid);  in rtnl_net_newid()
574 	spin_unlock_irqrestore(&net->nsid_lock, flags);  in rtnl_net_newid()
576 		rtnl_net_notifyid(net, RTM_NEWNSID, err);  in rtnl_net_newid()
592 			 int cmd, struct net *net, int nsid)  in rtnl_net_fill()  argument
617 	struct net *net = sock_net(skb->sk);  in rtnl_net_getid()  local
620 	struct net *peer;  in rtnl_net_getid()
643 	id = peernet2id(net, peer);  in rtnl_net_getid()
645 			    RTM_NEWNSID, net, id);  in rtnl_net_getid()
649 	err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid);  in rtnl_net_getid()
660 	struct net *net;  member
677 			    RTM_NEWNSID, net_cb->net, id);  in rtnl_net_dumpid_one()
688 	struct net *net = sock_net(skb->sk);  in rtnl_net_dumpid()  local
690 		.net = net,  in rtnl_net_dumpid()
698 	spin_lock_irqsave(&net->nsid_lock, flags);  in rtnl_net_dumpid()
699 	idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);  in rtnl_net_dumpid()
700 	spin_unlock_irqrestore(&net->nsid_lock, flags);  in rtnl_net_dumpid()
706 static void rtnl_net_notifyid(struct net *net, int cmd, int id)  in rtnl_net_notifyid()  argument
715 	err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, id);  in rtnl_net_notifyid()
719 	rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0);  in rtnl_net_notifyid()
725 	rtnl_set_sk_err(net, RTNLGRP_NSID, err);  in rtnl_net_notifyid()
733 	net_cachep = kmem_cache_create("net_namespace", sizeof(struct net),  in net_ns_init()
774 	struct net *net;  in __register_pernet_operations()  local
780 		for_each_net(net) {  in __register_pernet_operations()
781 			error = ops_init(ops, net);  in __register_pernet_operations()
784 			list_add_tail(&net->exit_list, &net_exit_list);  in __register_pernet_operations()
799 	struct net *net;  in __unregister_pernet_operations()  local
803 	for_each_net(net)  in __unregister_pernet_operations()
804 		list_add_tail(&net->exit_list, &net_exit_list);  in __unregister_pernet_operations()
964 	struct net *net = NULL;  in netns_get()  local
970 		net = get_net(nsproxy->net_ns);  in netns_get()
973 	return net ? &net->ns : NULL;  in netns_get()
976 static inline struct net *to_net_ns(struct ns_common *ns)  in to_net_ns()
978 	return container_of(ns, struct net, ns);  in to_net_ns()
988 	struct net *net = to_net_ns(ns);  in netns_install()  local
990 	if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) ||  in netns_install()
995 	nsproxy->net_ns = get_net(net);  in netns_install()