47 struct net init_net;
81 static int net_assign_generic(struct net *net, unsigned int id, void *data)  in net_assign_generic()  argument
87 	old_ng = rcu_dereference_protected(net->gen,  in net_assign_generic()
113 	rcu_assign_pointer(net->gen, ng);  in net_assign_generic()
118 static int ops_init(const struct pernet_operations *ops, struct net *net)  in ops_init()  argument
129 		err = net_assign_generic(net, *ops->id, data);  in ops_init()
135 		err = ops->init(net);  in ops_init()
141 		ng = rcu_dereference_protected(net->gen,  in ops_init()
155 	struct net *net;  in ops_pre_exit_list()  local
158 		list_for_each_entry(net, net_exit_list, exit_list)  in ops_pre_exit_list()
159 			ops->pre_exit(net);  in ops_pre_exit_list()
166 	struct net *net;  in ops_exit_list()  local
168 		list_for_each_entry(net, net_exit_list, exit_list) {  in ops_exit_list()
169 			ops->exit(net);  in ops_exit_list()
180 	struct net *net;  in ops_free_list()  local
182 		list_for_each_entry(net, net_exit_list, exit_list)  in ops_free_list()
183 			kfree(net_generic(net, *ops->id));  in ops_free_list()
188 static int alloc_netid(struct net *net, struct net *peer, int reqid)  in alloc_netid()  argument
197 	return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC);  in alloc_netid()
206 static int net_eq_idr(int id, void *net, void *peer)  in net_eq_idr()  argument
208 	if (net_eq(net, peer))  in net_eq_idr()
214 static int __peernet2id(const struct net *net, struct net *peer)  in __peernet2id()  argument
216 	int id = idr_for_each(&net->netns_ids, net_eq_idr, peer);  in __peernet2id()
227 static void rtnl_net_notifyid(struct net *net, int cmd, int id, u32 portid,
232 int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp)  in peernet2id_alloc()  argument
236 	if (refcount_read(&net->ns.count) == 0)  in peernet2id_alloc()
239 	spin_lock_bh(&net->nsid_lock);  in peernet2id_alloc()
240 	id = __peernet2id(net, peer);  in peernet2id_alloc()
242 		spin_unlock_bh(&net->nsid_lock);  in peernet2id_alloc()
252 		spin_unlock_bh(&net->nsid_lock);  in peernet2id_alloc()
256 	id = alloc_netid(net, peer, -1);  in peernet2id_alloc()
257 	spin_unlock_bh(&net->nsid_lock);  in peernet2id_alloc()
263 	rtnl_net_notifyid(net, RTM_NEWNSID, id, 0, NULL, gfp);  in peernet2id_alloc()
270 int peernet2id(const struct net *net, struct net *peer)  in peernet2id()  argument
275 	id = __peernet2id(net, peer);  in peernet2id()
285 bool peernet_has_id(const struct net *net, struct net *peer)  in peernet_has_id()  argument
287 	return peernet2id(net, peer) >= 0;  in peernet_has_id()
290 struct net *get_net_ns_by_id(const struct net *net, int id)  in get_net_ns_by_id()  argument
292 	struct net *peer;  in get_net_ns_by_id()
298 	peer = idr_find(&net->netns_ids, id);  in get_net_ns_by_id()
310 static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)  in setup_net()  argument
317 	refcount_set(&net->ns.count, 1);  in setup_net()
318 	ref_tracker_dir_init(&net->refcnt_tracker, 128);  in setup_net()
320 	refcount_set(&net->passive, 1);  in setup_net()
321 	get_random_bytes(&net->hash_mix, sizeof(u32));  in setup_net()
323 	net->net_cookie = gen_cookie_next(&net_cookie);  in setup_net()
325 	net->dev_base_seq = 1;  in setup_net()
326 	net->user_ns = user_ns;  in setup_net()
327 	idr_init(&net->netns_ids);  in setup_net()
328 	spin_lock_init(&net->nsid_lock);  in setup_net()
329 	mutex_init(&net->ipv4.ra_mutex);  in setup_net()
332 		error = ops_init(ops, net);  in setup_net()
337 	list_add_tail_rcu(&net->list, &net_namespace_list);  in setup_net()
346 	list_add(&net->exit_list, &net_exit_list);  in setup_net()
365 static int __net_init net_defaults_init_net(struct net *net)  in net_defaults_init_net()  argument
367 	net->core.sysctl_somaxconn = SOMAXCONN;  in net_defaults_init_net()
368 	net->core.sysctl_txrehash = SOCK_TXREHASH_ENABLED;  in net_defaults_init_net()
401 static struct net *net_alloc(void)  in net_alloc()
403 	struct net *net = NULL;  in net_alloc()  local
410 	net = kmem_cache_zalloc(net_cachep, GFP_KERNEL);  in net_alloc()
411 	if (!net)  in net_alloc()
415 	net->key_domain = kzalloc(sizeof(struct key_tag), GFP_KERNEL);  in net_alloc()
416 	if (!net->key_domain)  in net_alloc()
418 	refcount_set(&net->key_domain->usage, 1);  in net_alloc()
421 	rcu_assign_pointer(net->gen, ng);  in net_alloc()
423 	return net;  in net_alloc()
427 	kmem_cache_free(net_cachep, net);  in net_alloc()
428 	net = NULL;  in net_alloc()
435 static void net_free(struct net *net)  in net_free()  argument
437 	if (refcount_dec_and_test(&net->passive)) {  in net_free()
438 		kfree(rcu_access_pointer(net->gen));  in net_free()
439 		kmem_cache_free(net_cachep, net);  in net_free()
445 	struct net *net = (struct net *)p;  in net_drop_ns()  local
447 	if (net)  in net_drop_ns()
448 		net_free(net);  in net_drop_ns()
451 struct net *copy_net_ns(unsigned long flags,  in copy_net_ns()
452 			struct user_namespace *user_ns, struct net *old_net)  in copy_net_ns()
455 	struct net *net;  in copy_net_ns()  local
465 	net = net_alloc();  in copy_net_ns()
466 	if (!net) {  in copy_net_ns()
470 	refcount_set(&net->passive, 1);  in copy_net_ns()
471 	net->ucounts = ucounts;  in copy_net_ns()
478 	rv = setup_net(net, user_ns);  in copy_net_ns()
485 		key_remove_domain(net->key_domain);  in copy_net_ns()
488 		net_free(net);  in copy_net_ns()
493 	return net;  in copy_net_ns()
505 void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid)  in net_ns_get_ownership()  argument
507 	if (net) {  in net_ns_get_ownership()
508 		kuid_t ns_root_uid = make_kuid(net->user_ns, 0);  in net_ns_get_ownership()
509 		kgid_t ns_root_gid = make_kgid(net->user_ns, 0);  in net_ns_get_ownership()
523 static void unhash_nsid(struct net *net, struct net *last)  in unhash_nsid()  argument
525 	struct net *tmp;  in unhash_nsid()
536 		id = __peernet2id(tmp, net);  in unhash_nsid()
546 	spin_lock_bh(&net->nsid_lock);  in unhash_nsid()
547 	idr_destroy(&net->netns_ids);  in unhash_nsid()
548 	spin_unlock_bh(&net->nsid_lock);  in unhash_nsid()
556 	struct net *net, *tmp, *last;  in cleanup_net()  local
567 	llist_for_each_entry(net, net_kill_list, cleanup_list)  in cleanup_net()
568 		list_del_rcu(&net->list);  in cleanup_net()
579 	last = list_last_entry(&net_namespace_list, struct net, list);  in cleanup_net()
582 	llist_for_each_entry(net, net_kill_list, cleanup_list) {  in cleanup_net()
583 		unhash_nsid(net, last);  in cleanup_net()
584 		list_add_tail(&net->exit_list, &net_exit_list);  in cleanup_net()
615 	list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {  in cleanup_net()
616 		list_del_init(&net->exit_list);  in cleanup_net()
617 		dec_net_namespaces(net->ucounts);  in cleanup_net()
619 		key_remove_domain(net->key_domain);  in cleanup_net()
621 		put_user_ns(net->user_ns);  in cleanup_net()
622 		net_free(net);  in cleanup_net()
644 void __put_net(struct net *net)  in __put_net()  argument
646 	ref_tracker_dir_exit(&net->refcnt_tracker);  in __put_net()
648 	if (llist_add(&net->cleanup_list, &cleanup_list))  in __put_net()
661 	return &get_net(container_of(ns, struct net, ns))->ns;  in get_net_ns()
665 struct net *get_net_ns_by_fd(int fd)  in get_net_ns_by_fd()
669 	struct net *net;  in get_net_ns_by_fd()  local
677 		net = get_net(container_of(ns, struct net, ns));  in get_net_ns_by_fd()
679 		net = ERR_PTR(-EINVAL);  in get_net_ns_by_fd()
682 	return net;  in get_net_ns_by_fd()
687 struct net *get_net_ns_by_pid(pid_t pid)  in get_net_ns_by_pid()
690 	struct net *net;  in get_net_ns_by_pid()  local
693 	net = ERR_PTR(-ESRCH);  in get_net_ns_by_pid()
701 			net = get_net(nsproxy->net_ns);  in get_net_ns_by_pid()
705 	return net;  in get_net_ns_by_pid()
709 static __net_init int net_ns_net_init(struct net *net)  in net_ns_net_init()  argument
712 	net->ns.ops = &netns_operations;  in net_ns_net_init()
714 	return ns_alloc_inum(&net->ns);  in net_ns_net_init()
717 static __net_exit void net_ns_net_exit(struct net *net)  in net_ns_net_exit()  argument
719 	ns_free_inum(&net->ns);  in net_ns_net_exit()
738 	struct net *net = sock_net(skb->sk);  in rtnl_net_newid()  local
741 	struct net *peer;  in rtnl_net_newid()
770 	spin_lock_bh(&net->nsid_lock);  in rtnl_net_newid()
771 	if (__peernet2id(net, peer) >= 0) {  in rtnl_net_newid()
772 		spin_unlock_bh(&net->nsid_lock);  in rtnl_net_newid()
780 	err = alloc_netid(net, peer, nsid);  in rtnl_net_newid()
781 	spin_unlock_bh(&net->nsid_lock);  in rtnl_net_newid()
783 		rtnl_net_notifyid(net, RTM_NEWNSID, err, NETLINK_CB(skb).portid,  in rtnl_net_newid()
882 	struct net *net = sock_net(skb->sk);  in rtnl_net_getid()  local
889 	struct net *peer, *target = net;  in rtnl_net_getid()
904 		peer = get_net_ns_by_id(net, nla_get_s32(tb[NETNSA_NSID]));  in rtnl_net_getid()
931 		fillargs.ref_nsid = peernet2id(net, peer);  in rtnl_net_getid()
945 	err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid);  in rtnl_net_getid()
958 	struct net *tgt_net;
959 	struct net *ref_net;
1006 			struct net *net;  in rtnl_valid_dump_net_req()  local
1008 			net = rtnl_get_net_ns_capable(sk, nla_get_s32(tb[i]));  in rtnl_valid_dump_net_req()
1009 			if (IS_ERR(net)) {  in rtnl_valid_dump_net_req()
1013 				return PTR_ERR(net);  in rtnl_valid_dump_net_req()
1017 			net_cb->tgt_net = net;  in rtnl_valid_dump_net_req()
1062 static void rtnl_net_notifyid(struct net *net, int cmd, int id, u32 portid,  in rtnl_net_notifyid()  argument
1082 	rtnl_notify(msg, net, portid, RTNLGRP_NSID, nlh, gfp);  in rtnl_net_notifyid()
1088 	rtnl_set_sk_err(net, RTNLGRP_NSID, err);  in rtnl_net_notifyid()
1096 	net_cachep = kmem_cache_create("net_namespace", sizeof(struct net),  in net_ns_init()
1143 	struct net *net;  in __register_pernet_operations()  local
1152 		for_each_net(net) {  in __register_pernet_operations()
1153 			error = ops_init(ops, net);  in __register_pernet_operations()
1156 			list_add_tail(&net->exit_list, &net_exit_list);  in __register_pernet_operations()
1170 	struct net *net;  in __unregister_pernet_operations()  local
1175 	for_each_net(net)  in __unregister_pernet_operations()
1176 		list_add_tail(&net->exit_list, &net_exit_list);  in __unregister_pernet_operations()
1339 	struct net *net = NULL;  in netns_get()  local
1345 		net = get_net(nsproxy->net_ns);  in netns_get()
1348 	return net ? &net->ns : NULL;  in netns_get()
1351 static inline struct net *to_net_ns(struct ns_common *ns)  in to_net_ns()
1353 	return container_of(ns, struct net, ns);  in to_net_ns()
1364 	struct net *net = to_net_ns(ns);  in netns_install()  local
1366 	if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) ||  in netns_install()
1371 	nsproxy->net_ns = get_net(net);  in netns_install()