41 struct net init_net = {
76 static int net_assign_generic(struct net *net, unsigned int id, void *data)  in net_assign_generic()  argument
82 	old_ng = rcu_dereference_protected(net->gen,  in net_assign_generic()
108 	rcu_assign_pointer(net->gen, ng);  in net_assign_generic()
113 static int ops_init(const struct pernet_operations *ops, struct net *net)  in ops_init()  argument
123 		err = net_assign_generic(net, *ops->id, data);  in ops_init()
129 		err = ops->init(net);  in ops_init()
140 static void ops_free(const struct pernet_operations *ops, struct net *net)  in ops_free()  argument
143 		kfree(net_generic(net, *ops->id));  in ops_free()
150 	struct net *net;  in ops_exit_list()  local
152 		list_for_each_entry(net, net_exit_list, exit_list)  in ops_exit_list()
153 			ops->exit(net);  in ops_exit_list()
162 	struct net *net;  in ops_free_list()  local
164 		list_for_each_entry(net, net_exit_list, exit_list)  in ops_free_list()
165 			ops_free(ops, net);  in ops_free_list()
170 static int alloc_netid(struct net *net, struct net *peer, int reqid)  in alloc_netid()  argument
179 	return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC);  in alloc_netid()
188 static int net_eq_idr(int id, void *net, void *peer)  in net_eq_idr()  argument
190 	if (net_eq(net, peer))  in net_eq_idr()
199 static int __peernet2id_alloc(struct net *net, struct net *peer, bool *alloc)  in __peernet2id_alloc()  argument
201 	int id = idr_for_each(&net->netns_ids, net_eq_idr, peer);  in __peernet2id_alloc()
213 		id = alloc_netid(net, peer, -1);  in __peernet2id_alloc()
222 static int __peernet2id(struct net *net, struct net *peer)  in __peernet2id()  argument
226 	return __peernet2id_alloc(net, peer, &no);  in __peernet2id()
229 static void rtnl_net_notifyid(struct net *net, int cmd, int id);
233 int peernet2id_alloc(struct net *net, struct net *peer)  in peernet2id_alloc()  argument
238 	if (refcount_read(&net->count) == 0)  in peernet2id_alloc()
240 	spin_lock_bh(&net->nsid_lock);  in peernet2id_alloc()
249 	id = __peernet2id_alloc(net, peer, &alloc);  in peernet2id_alloc()
250 	spin_unlock_bh(&net->nsid_lock);  in peernet2id_alloc()
252 		rtnl_net_notifyid(net, RTM_NEWNSID, id);  in peernet2id_alloc()
260 int peernet2id(struct net *net, struct net *peer)  in peernet2id()  argument
264 	spin_lock_bh(&net->nsid_lock);  in peernet2id()
265 	id = __peernet2id(net, peer);  in peernet2id()
266 	spin_unlock_bh(&net->nsid_lock);  in peernet2id()
274 bool peernet_has_id(struct net *net, struct net *peer)  in peernet_has_id()  argument
276 	return peernet2id(net, peer) >= 0;  in peernet_has_id()
279 struct net *get_net_ns_by_id(struct net *net, int id)  in get_net_ns_by_id()  argument
281 	struct net *peer;  in get_net_ns_by_id()
287 	peer = idr_find(&net->netns_ids, id);  in get_net_ns_by_id()
298 static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)  in setup_net()  argument
305 	refcount_set(&net->count, 1);  in setup_net()
306 	refcount_set(&net->passive, 1);  in setup_net()
307 	net->dev_base_seq = 1;  in setup_net()
308 	net->user_ns = user_ns;  in setup_net()
309 	idr_init(&net->netns_ids);  in setup_net()
310 	spin_lock_init(&net->nsid_lock);  in setup_net()
311 	mutex_init(&net->ipv4.ra_mutex);  in setup_net()
314 		error = ops_init(ops, net);  in setup_net()
319 	list_add_tail_rcu(&net->list, &net_namespace_list);  in setup_net()
328 	list_add(&net->exit_list, &net_exit_list);  in setup_net()
341 static int __net_init net_defaults_init_net(struct net *net)  in net_defaults_init_net()  argument
343 	net->core.sysctl_somaxconn = SOMAXCONN;  in net_defaults_init_net()
375 static struct net *net_alloc(void)  in net_alloc()
377 	struct net *net = NULL;  in net_alloc()  local
384 	net = kmem_cache_zalloc(net_cachep, GFP_KERNEL);  in net_alloc()
385 	if (!net)  in net_alloc()
388 	rcu_assign_pointer(net->gen, ng);  in net_alloc()
390 	return net;  in net_alloc()
397 static void net_free(struct net *net)  in net_free()  argument
399 	kfree(rcu_access_pointer(net->gen));  in net_free()
400 	kmem_cache_free(net_cachep, net);  in net_free()
405 	struct net *ns = p;  in net_drop_ns()
410 struct net *copy_net_ns(unsigned long flags,  in copy_net_ns()
411 			struct user_namespace *user_ns, struct net *old_net)  in copy_net_ns()
414 	struct net *net;  in copy_net_ns()  local
424 	net = net_alloc();  in copy_net_ns()
425 	if (!net) {  in copy_net_ns()
429 	refcount_set(&net->passive, 1);  in copy_net_ns()
430 	net->ucounts = ucounts;  in copy_net_ns()
437 	rv = setup_net(net, user_ns);  in copy_net_ns()
444 		net_drop_ns(net);  in copy_net_ns()
449 	return net;  in copy_net_ns()
461 void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid)  in net_ns_get_ownership()  argument
463 	if (net) {  in net_ns_get_ownership()
464 		kuid_t ns_root_uid = make_kuid(net->user_ns, 0);  in net_ns_get_ownership()
465 		kgid_t ns_root_gid = make_kgid(net->user_ns, 0);  in net_ns_get_ownership()
479 static void unhash_nsid(struct net *net, struct net *last)  in unhash_nsid()  argument
481 	struct net *tmp;  in unhash_nsid()
492 		id = __peernet2id(tmp, net);  in unhash_nsid()
501 	spin_lock_bh(&net->nsid_lock);  in unhash_nsid()
502 	idr_destroy(&net->netns_ids);  in unhash_nsid()
503 	spin_unlock_bh(&net->nsid_lock);  in unhash_nsid()
511 	struct net *net, *tmp, *last;  in cleanup_net()  local
522 	llist_for_each_entry(net, net_kill_list, cleanup_list)  in cleanup_net()
523 		list_del_rcu(&net->list);  in cleanup_net()
534 	last = list_last_entry(&net_namespace_list, struct net, list);  in cleanup_net()
537 	llist_for_each_entry(net, net_kill_list, cleanup_list) {  in cleanup_net()
538 		unhash_nsid(net, last);  in cleanup_net()
539 		list_add_tail(&net->exit_list, &net_exit_list);  in cleanup_net()
565 	list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {  in cleanup_net()
566 		list_del_init(&net->exit_list);  in cleanup_net()
567 		dec_net_namespaces(net->ucounts);  in cleanup_net()
568 		put_user_ns(net->user_ns);  in cleanup_net()
569 		net_drop_ns(net);  in cleanup_net()
591 void __put_net(struct net *net)  in __put_net()  argument
594 	if (llist_add(&net->cleanup_list, &cleanup_list))  in __put_net()
599 struct net *get_net_ns_by_fd(int fd)  in get_net_ns_by_fd()
603 	struct net *net;  in get_net_ns_by_fd()  local
611 		net = get_net(container_of(ns, struct net, ns));  in get_net_ns_by_fd()
613 		net = ERR_PTR(-EINVAL);  in get_net_ns_by_fd()
616 	return net;  in get_net_ns_by_fd()
620 struct net *get_net_ns_by_fd(int fd)  in get_net_ns_by_fd()
627 struct net *get_net_ns_by_pid(pid_t pid)  in get_net_ns_by_pid()
630 	struct net *net;  in get_net_ns_by_pid()  local
633 	net = ERR_PTR(-ESRCH);  in get_net_ns_by_pid()
641 			net = get_net(nsproxy->net_ns);  in get_net_ns_by_pid()
645 	return net;  in get_net_ns_by_pid()
649 static __net_init int net_ns_net_init(struct net *net)  in net_ns_net_init()  argument
652 	net->ns.ops = &netns_operations;  in net_ns_net_init()
654 	return ns_alloc_inum(&net->ns);  in net_ns_net_init()
657 static __net_exit void net_ns_net_exit(struct net *net)  in net_ns_net_exit()  argument
659 	ns_free_inum(&net->ns);  in net_ns_net_exit()
677 	struct net *net = sock_net(skb->sk);  in rtnl_net_newid()  local
680 	struct net *peer;  in rtnl_net_newid()
709 	spin_lock_bh(&net->nsid_lock);  in rtnl_net_newid()
710 	if (__peernet2id(net, peer) >= 0) {  in rtnl_net_newid()
711 		spin_unlock_bh(&net->nsid_lock);  in rtnl_net_newid()
719 	err = alloc_netid(net, peer, nsid);  in rtnl_net_newid()
720 	spin_unlock_bh(&net->nsid_lock);  in rtnl_net_newid()
722 		rtnl_net_notifyid(net, RTM_NEWNSID, err);  in rtnl_net_newid()
742 			 int cmd, struct net *net, int nsid)  in rtnl_net_fill()  argument
768 	struct net *net = sock_net(skb->sk);  in rtnl_net_getid()  local
772 	struct net *peer;  in rtnl_net_getid()
802 	id = peernet2id(net, peer);  in rtnl_net_getid()
804 			    RTM_NEWNSID, net, id);  in rtnl_net_getid()
808 	err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid);  in rtnl_net_getid()
819 	struct net *net;  member
836 			    RTM_NEWNSID, net_cb->net, id);  in rtnl_net_dumpid_one()
847 	struct net *net = sock_net(skb->sk);  in rtnl_net_dumpid()  local
849 		.net = net,  in rtnl_net_dumpid()
856 	spin_lock_bh(&net->nsid_lock);  in rtnl_net_dumpid()
857 	idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);  in rtnl_net_dumpid()
858 	spin_unlock_bh(&net->nsid_lock);  in rtnl_net_dumpid()
864 static void rtnl_net_notifyid(struct net *net, int cmd, int id)  in rtnl_net_notifyid()  argument
873 	err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, id);  in rtnl_net_notifyid()
877 	rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0);  in rtnl_net_notifyid()
883 	rtnl_set_sk_err(net, RTNLGRP_NSID, err);  in rtnl_net_notifyid()
891 	net_cachep = kmem_cache_create("net_namespace", sizeof(struct net),  in net_ns_init()
930 	struct net *net;  in __register_pernet_operations()  local
939 		for_each_net(net) {  in __register_pernet_operations()
940 			error = ops_init(ops, net);  in __register_pernet_operations()
943 			list_add_tail(&net->exit_list, &net_exit_list);  in __register_pernet_operations()
958 	struct net *net;  in __unregister_pernet_operations()  local
963 	for_each_net(net)  in __unregister_pernet_operations()
964 		list_add_tail(&net->exit_list, &net_exit_list);  in __unregister_pernet_operations()
1128 	struct net *net = NULL;  in netns_get()  local
1134 		net = get_net(nsproxy->net_ns);  in netns_get()
1137 	return net ? &net->ns : NULL;  in netns_get()
1140 static inline struct net *to_net_ns(struct ns_common *ns)  in to_net_ns()
1142 	return container_of(ns, struct net, ns);  in to_net_ns()
1152 	struct net *net = to_net_ns(ns);  in netns_install()  local
1154 	if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) ||  in netns_install()
1159 	nsproxy->net_ns = get_net(net);  in netns_install()