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()
150 static void rtnl_net_notifyid(struct net *net, struct net *peer, int cmd,
152 static int alloc_netid(struct net *net, struct net *peer, int reqid)  in alloc_netid()  argument
163 	id = idr_alloc(&net->netns_ids, peer, min, max, GFP_KERNEL);  in alloc_netid()
165 		rtnl_net_notifyid(net, peer, RTM_NEWNSID, id);  in alloc_netid()
176 static int net_eq_idr(int id, void *net, void *peer)  in net_eq_idr()  argument
178 	if (net_eq(net, peer))  in net_eq_idr()
183 static int __peernet2id(struct net *net, struct net *peer, bool alloc)  in __peernet2id()  argument
185 	int id = idr_for_each(&net->netns_ids, net_eq_idr, peer);  in __peernet2id()
196 		return alloc_netid(net, peer, -1);  in __peernet2id()
204 int peernet2id(struct net *net, struct net *peer)  in peernet2id()  argument
209 	id = __peernet2id(net, peer, alloc);  in peernet2id()
214 struct net *get_net_ns_by_id(struct net *net, int id)  in get_net_ns_by_id()  argument
216 	struct net *peer;  in get_net_ns_by_id()
222 	peer = idr_find(&net->netns_ids, id);  in get_net_ns_by_id()
233 static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)  in setup_net()  argument
240 	atomic_set(&net->count, 1);  in setup_net()
241 	atomic_set(&net->passive, 1);  in setup_net()
242 	net->dev_base_seq = 1;  in setup_net()
243 	net->user_ns = user_ns;  in setup_net()
244 	idr_init(&net->netns_ids);  in setup_net()
247 		error = ops_init(ops, net);  in setup_net()
258 	list_add(&net->exit_list, &net_exit_list);  in setup_net()
276 static struct net *net_alloc(void)  in net_alloc()
278 	struct net *net = NULL;  in net_alloc()  local
285 	net = kmem_cache_zalloc(net_cachep, GFP_KERNEL);  in net_alloc()
286 	if (!net)  in net_alloc()
289 	rcu_assign_pointer(net->gen, ng);  in net_alloc()
291 	return net;  in net_alloc()
298 static void net_free(struct net *net)  in net_free()  argument
300 	kfree(rcu_access_pointer(net->gen));  in net_free()
301 	kmem_cache_free(net_cachep, net);  in net_free()
306 	struct net *ns = p;  in net_drop_ns()
311 struct net *copy_net_ns(unsigned long flags,  in copy_net_ns()
312 			struct user_namespace *user_ns, struct net *old_net)  in copy_net_ns()
314 	struct net *net;  in copy_net_ns()  local
320 	net = net_alloc();  in copy_net_ns()
321 	if (!net)  in copy_net_ns()
327 	rv = setup_net(net, user_ns);  in copy_net_ns()
330 		list_add_tail_rcu(&net->list, &net_namespace_list);  in copy_net_ns()
336 		net_drop_ns(net);  in copy_net_ns()
339 	return net;  in copy_net_ns()
348 	struct net *net, *tmp;  in cleanup_net()  local
361 	list_for_each_entry(net, &net_kill_list, cleanup_list) {  in cleanup_net()
362 		list_del_rcu(&net->list);  in cleanup_net()
363 		list_add_tail(&net->exit_list, &net_exit_list);  in cleanup_net()
365 			int id = __peernet2id(tmp, net, false);  in cleanup_net()
368 				rtnl_net_notifyid(tmp, net, RTM_DELNSID, id);  in cleanup_net()
372 		idr_destroy(&net->netns_ids);  in cleanup_net()
400 	list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {  in cleanup_net()
401 		list_del_init(&net->exit_list);  in cleanup_net()
402 		put_user_ns(net->user_ns);  in cleanup_net()
403 		net_drop_ns(net);  in cleanup_net()
408 void __put_net(struct net *net)  in __put_net()  argument
414 	list_add(&net->cleanup_list, &cleanup_list);  in __put_net()
421 struct net *get_net_ns_by_fd(int fd)  in get_net_ns_by_fd()
425 	struct net *net;  in get_net_ns_by_fd()  local
433 		net = get_net(container_of(ns, struct net, ns));  in get_net_ns_by_fd()
435 		net = ERR_PTR(-EINVAL);  in get_net_ns_by_fd()
438 	return net;  in get_net_ns_by_fd()
442 struct net *get_net_ns_by_fd(int fd)  in get_net_ns_by_fd()
449 struct net *get_net_ns_by_pid(pid_t pid)  in get_net_ns_by_pid()
452 	struct net *net;  in get_net_ns_by_pid()  local
455 	net = ERR_PTR(-ESRCH);  in get_net_ns_by_pid()
463 			net = get_net(nsproxy->net_ns);  in get_net_ns_by_pid()
467 	return net;  in get_net_ns_by_pid()
471 static __net_init int net_ns_net_init(struct net *net)  in net_ns_net_init()  argument
474 	net->ns.ops = &netns_operations;  in net_ns_net_init()
476 	return ns_alloc_inum(&net->ns);  in net_ns_net_init()
479 static __net_exit void net_ns_net_exit(struct net *net)  in net_ns_net_exit()  argument
481 	ns_free_inum(&net->ns);  in net_ns_net_exit()
498 	struct net *net = sock_net(skb->sk);  in rtnl_net_newid()  local
500 	struct net *peer;  in rtnl_net_newid()
520 	if (__peernet2id(net, peer, false) >= 0) {  in rtnl_net_newid()
525 	err = alloc_netid(net, peer, nsid);  in rtnl_net_newid()
541 			 int cmd, struct net *net, struct net *peer,  in rtnl_net_fill()  argument
560 		id = __peernet2id(net, peer, false);  in rtnl_net_fill()
577 	struct net *net = sock_net(skb->sk);  in rtnl_net_getid()  local
580 	struct net *peer;  in rtnl_net_getid()
604 			    RTM_NEWNSID, net, peer, -1);  in rtnl_net_getid()
608 	err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid);  in rtnl_net_getid()
619 	struct net *net;  member
636 			    RTM_NEWNSID, net_cb->net, peer, id);  in rtnl_net_dumpid_one()
647 	struct net *net = sock_net(skb->sk);  in rtnl_net_dumpid()  local
649 		.net = net,  in rtnl_net_dumpid()
658 	idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);  in rtnl_net_dumpid()
664 static void rtnl_net_notifyid(struct net *net, struct net *peer, int cmd,  in rtnl_net_notifyid()  argument
674 	err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, peer, id);  in rtnl_net_notifyid()
678 	rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0);  in rtnl_net_notifyid()
684 	rtnl_set_sk_err(net, RTNLGRP_NSID, err);  in rtnl_net_notifyid()
692 	net_cachep = kmem_cache_create("net_namespace", sizeof(struct net),  in net_ns_init()
733 	struct net *net;  in __register_pernet_operations()  local
739 		for_each_net(net) {  in __register_pernet_operations()
740 			error = ops_init(ops, net);  in __register_pernet_operations()
743 			list_add_tail(&net->exit_list, &net_exit_list);  in __register_pernet_operations()
758 	struct net *net;  in __unregister_pernet_operations()  local
762 	for_each_net(net)  in __unregister_pernet_operations()
763 		list_add_tail(&net->exit_list, &net_exit_list);  in __unregister_pernet_operations()
923 	struct net *net = NULL;  in netns_get()  local
929 		net = get_net(nsproxy->net_ns);  in netns_get()
932 	return net ? &net->ns : NULL;  in netns_get()
935 static inline struct net *to_net_ns(struct ns_common *ns)  in to_net_ns()
937 	return container_of(ns, struct net, ns);  in to_net_ns()
947 	struct net *net = to_net_ns(ns);  in netns_install()  local
949 	if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) ||  in netns_install()
954 	nsproxy->net_ns = get_net(net);  in netns_install()