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>
19 #include <linux/sched/task.h>
20 #include <linux/uidgid.h>
23 #include <net/netlink.h>
24 #include <net/net_namespace.h>
25 #include <net/netns/generic.h>
28 * Our network namespace constructor/destructor lists
31 static LIST_HEAD(pernet_list);
32 static struct list_head *first_device = &pernet_list;
34 LIST_HEAD(net_namespace_list);
35 EXPORT_SYMBOL_GPL(net_namespace_list);
37 /* Protects net_namespace_list. Nests iside rtnl_lock() */
38 DECLARE_RWSEM(net_rwsem);
39 EXPORT_SYMBOL_GPL(net_rwsem);
41 struct net init_net = {
42 .count = REFCOUNT_INIT(1),
43 .dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head),
45 EXPORT_SYMBOL(init_net);
47 static bool init_net_initialized;
49 * pernet_ops_rwsem: protects: pernet_list, net_generic_ids,
50 * init_net_initialized and first_device pointer.
51 * This is internal net namespace object. Please, don't use it
54 DECLARE_RWSEM(pernet_ops_rwsem);
55 EXPORT_SYMBOL_GPL(pernet_ops_rwsem);
57 #define MIN_PERNET_OPS_ID \
58 ((sizeof(struct net_generic) + sizeof(void *) - 1) / sizeof(void *))
60 #define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */
62 static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS;
64 static struct net_generic *net_alloc_generic(void)
66 struct net_generic *ng;
67 unsigned int generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]);
69 ng = kzalloc(generic_size, GFP_KERNEL);
71 ng->s.len = max_gen_ptrs;
76 static int net_assign_generic(struct net *net, unsigned int id, void *data)
78 struct net_generic *ng, *old_ng;
80 BUG_ON(id < MIN_PERNET_OPS_ID);
82 old_ng = rcu_dereference_protected(net->gen,
83 lockdep_is_held(&pernet_ops_rwsem));
84 if (old_ng->s.len > id) {
85 old_ng->ptr[id] = data;
89 ng = net_alloc_generic();
94 * Some synchronisation notes:
96 * The net_generic explores the net->gen array inside rcu
97 * read section. Besides once set the net->gen->ptr[x]
98 * pointer never changes (see rules in netns/generic.h).
100 * That said, we simply duplicate this array and schedule
101 * the old copy for kfree after a grace period.
104 memcpy(&ng->ptr[MIN_PERNET_OPS_ID], &old_ng->ptr[MIN_PERNET_OPS_ID],
105 (old_ng->s.len - MIN_PERNET_OPS_ID) * sizeof(void *));
108 rcu_assign_pointer(net->gen, ng);
109 kfree_rcu(old_ng, s.rcu);
113 static int ops_init(const struct pernet_operations *ops, struct net *net)
118 if (ops->id && ops->size) {
119 data = kzalloc(ops->size, GFP_KERNEL);
123 err = net_assign_generic(net, *ops->id, data);
129 err = ops->init(net);
140 static void ops_free(const struct pernet_operations *ops, struct net *net)
142 if (ops->id && ops->size) {
143 kfree(net_generic(net, *ops->id));
147 static void ops_exit_list(const struct pernet_operations *ops,
148 struct list_head *net_exit_list)
152 list_for_each_entry(net, net_exit_list, exit_list)
156 ops->exit_batch(net_exit_list);
159 static void ops_free_list(const struct pernet_operations *ops,
160 struct list_head *net_exit_list)
163 if (ops->size && ops->id) {
164 list_for_each_entry(net, net_exit_list, exit_list)
169 /* should be called with nsid_lock held */
170 static int alloc_netid(struct net *net, struct net *peer, int reqid)
172 int min = 0, max = 0;
179 return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC);
182 /* This function is used by idr_for_each(). If net is equal to peer, the
183 * function returns the id so that idr_for_each() stops. Because we cannot
184 * returns the id 0 (idr_for_each() will not stop), we return the magic value
185 * NET_ID_ZERO (-1) for it.
187 #define NET_ID_ZERO -1
188 static int net_eq_idr(int id, void *net, void *peer)
190 if (net_eq(net, peer))
191 return id ? : NET_ID_ZERO;
195 /* Should be called with nsid_lock held. If a new id is assigned, the bool alloc
196 * is set to true, thus the caller knows that the new id must be notified via
199 static int __peernet2id_alloc(struct net *net, struct net *peer, bool *alloc)
201 int id = idr_for_each(&net->netns_ids, net_eq_idr, peer);
202 bool alloc_it = *alloc;
206 /* Magic value for id 0. */
207 if (id == NET_ID_ZERO)
213 id = alloc_netid(net, peer, -1);
215 return id >= 0 ? id : NETNSA_NSID_NOT_ASSIGNED;
218 return NETNSA_NSID_NOT_ASSIGNED;
221 /* should be called with nsid_lock held */
222 static int __peernet2id(struct net *net, struct net *peer)
226 return __peernet2id_alloc(net, peer, &no);
229 static void rtnl_net_notifyid(struct net *net, int cmd, int id);
230 /* This function returns the id of a peer netns. If no id is assigned, one will
231 * be allocated and returned.
233 int peernet2id_alloc(struct net *net, struct net *peer)
235 bool alloc = false, alive = false;
238 if (refcount_read(&net->count) == 0)
239 return NETNSA_NSID_NOT_ASSIGNED;
240 spin_lock_bh(&net->nsid_lock);
242 * When peer is obtained from RCU lists, we may race with
243 * its cleanup. Check whether it's alive, and this guarantees
244 * we never hash a peer back to net->netns_ids, after it has
245 * just been idr_remove()'d from there in cleanup_net().
247 if (maybe_get_net(peer))
248 alive = alloc = true;
249 id = __peernet2id_alloc(net, peer, &alloc);
250 spin_unlock_bh(&net->nsid_lock);
251 if (alloc && id >= 0)
252 rtnl_net_notifyid(net, RTM_NEWNSID, id);
257 EXPORT_SYMBOL_GPL(peernet2id_alloc);
259 /* This function returns, if assigned, the id of a peer netns. */
260 int peernet2id(struct net *net, struct net *peer)
264 spin_lock_bh(&net->nsid_lock);
265 id = __peernet2id(net, peer);
266 spin_unlock_bh(&net->nsid_lock);
269 EXPORT_SYMBOL(peernet2id);
271 /* This function returns true is the peer netns has an id assigned into the
274 bool peernet_has_id(struct net *net, struct net *peer)
276 return peernet2id(net, peer) >= 0;
279 struct net *get_net_ns_by_id(struct net *net, int id)
287 peer = idr_find(&net->netns_ids, id);
289 peer = maybe_get_net(peer);
296 * setup_net runs the initializers for the network namespace object.
298 static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
300 /* Must be called with pernet_ops_rwsem held */
301 const struct pernet_operations *ops, *saved_ops;
303 LIST_HEAD(net_exit_list);
305 refcount_set(&net->count, 1);
306 refcount_set(&net->passive, 1);
307 get_random_bytes(&net->hash_mix, sizeof(u32));
308 net->dev_base_seq = 1;
309 net->user_ns = user_ns;
310 idr_init(&net->netns_ids);
311 spin_lock_init(&net->nsid_lock);
312 mutex_init(&net->ipv4.ra_mutex);
314 list_for_each_entry(ops, &pernet_list, list) {
315 error = ops_init(ops, net);
319 down_write(&net_rwsem);
320 list_add_tail_rcu(&net->list, &net_namespace_list);
321 up_write(&net_rwsem);
326 /* Walk through the list backwards calling the exit functions
327 * for the pernet modules whose init functions did not fail.
329 list_add(&net->exit_list, &net_exit_list);
331 list_for_each_entry_continue_reverse(ops, &pernet_list, list)
332 ops_exit_list(ops, &net_exit_list);
335 list_for_each_entry_continue_reverse(ops, &pernet_list, list)
336 ops_free_list(ops, &net_exit_list);
342 static int __net_init net_defaults_init_net(struct net *net)
344 net->core.sysctl_somaxconn = SOMAXCONN;
348 static struct pernet_operations net_defaults_ops = {
349 .init = net_defaults_init_net,
352 static __init int net_defaults_init(void)
354 if (register_pernet_subsys(&net_defaults_ops))
355 panic("Cannot initialize net default settings");
360 core_initcall(net_defaults_init);
363 static struct ucounts *inc_net_namespaces(struct user_namespace *ns)
365 return inc_ucount(ns, current_euid(), UCOUNT_NET_NAMESPACES);
368 static void dec_net_namespaces(struct ucounts *ucounts)
370 dec_ucount(ucounts, UCOUNT_NET_NAMESPACES);
373 static struct kmem_cache *net_cachep __ro_after_init;
374 static struct workqueue_struct *netns_wq;
376 static struct net *net_alloc(void)
378 struct net *net = NULL;
379 struct net_generic *ng;
381 ng = net_alloc_generic();
385 net = kmem_cache_zalloc(net_cachep, GFP_KERNEL);
389 rcu_assign_pointer(net->gen, ng);
398 static void net_free(struct net *net)
400 kfree(rcu_access_pointer(net->gen));
401 kmem_cache_free(net_cachep, net);
404 void net_drop_ns(void *p)
407 if (ns && refcount_dec_and_test(&ns->passive))
411 struct net *copy_net_ns(unsigned long flags,
412 struct user_namespace *user_ns, struct net *old_net)
414 struct ucounts *ucounts;
418 if (!(flags & CLONE_NEWNET))
419 return get_net(old_net);
421 ucounts = inc_net_namespaces(user_ns);
423 return ERR_PTR(-ENOSPC);
430 refcount_set(&net->passive, 1);
431 net->ucounts = ucounts;
432 get_user_ns(user_ns);
434 rv = down_read_killable(&pernet_ops_rwsem);
438 rv = setup_net(net, user_ns);
440 up_read(&pernet_ops_rwsem);
444 put_user_ns(user_ns);
447 dec_net_namespaces(ucounts);
454 * net_ns_get_ownership - get sysfs ownership data for @net
455 * @net: network namespace in question (can be NULL)
456 * @uid: kernel user ID for sysfs objects
457 * @gid: kernel group ID for sysfs objects
459 * Returns the uid/gid pair of root in the user namespace associated with the
460 * given network namespace.
462 void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid)
465 kuid_t ns_root_uid = make_kuid(net->user_ns, 0);
466 kgid_t ns_root_gid = make_kgid(net->user_ns, 0);
468 if (uid_valid(ns_root_uid))
471 if (gid_valid(ns_root_gid))
474 *uid = GLOBAL_ROOT_UID;
475 *gid = GLOBAL_ROOT_GID;
478 EXPORT_SYMBOL_GPL(net_ns_get_ownership);
480 static void unhash_nsid(struct net *net, struct net *last)
483 /* This function is only called from cleanup_net() work,
484 * and this work is the only process, that may delete
485 * a net from net_namespace_list. So, when the below
486 * is executing, the list may only grow. Thus, we do not
487 * use for_each_net_rcu() or net_rwsem.
492 spin_lock_bh(&tmp->nsid_lock);
493 id = __peernet2id(tmp, net);
495 idr_remove(&tmp->netns_ids, id);
496 spin_unlock_bh(&tmp->nsid_lock);
498 rtnl_net_notifyid(tmp, RTM_DELNSID, id);
502 spin_lock_bh(&net->nsid_lock);
503 idr_destroy(&net->netns_ids);
504 spin_unlock_bh(&net->nsid_lock);
507 static LLIST_HEAD(cleanup_list);
509 static void cleanup_net(struct work_struct *work)
511 const struct pernet_operations *ops;
512 struct net *net, *tmp, *last;
513 struct llist_node *net_kill_list;
514 LIST_HEAD(net_exit_list);
516 /* Atomically snapshot the list of namespaces to cleanup */
517 net_kill_list = llist_del_all(&cleanup_list);
519 down_read(&pernet_ops_rwsem);
521 /* Don't let anyone else find us. */
522 down_write(&net_rwsem);
523 llist_for_each_entry(net, net_kill_list, cleanup_list)
524 list_del_rcu(&net->list);
525 /* Cache last net. After we unlock rtnl, no one new net
526 * added to net_namespace_list can assign nsid pointer
527 * to a net from net_kill_list (see peernet2id_alloc()).
528 * So, we skip them in unhash_nsid().
530 * Note, that unhash_nsid() does not delete nsid links
531 * between net_kill_list's nets, as they've already
532 * deleted from net_namespace_list. But, this would be
533 * useless anyway, as netns_ids are destroyed there.
535 last = list_last_entry(&net_namespace_list, struct net, list);
536 up_write(&net_rwsem);
538 llist_for_each_entry(net, net_kill_list, cleanup_list) {
539 unhash_nsid(net, last);
540 list_add_tail(&net->exit_list, &net_exit_list);
544 * Another CPU might be rcu-iterating the list, wait for it.
545 * This needs to be before calling the exit() notifiers, so
546 * the rcu_barrier() below isn't sufficient alone.
550 /* Run all of the network namespace exit methods */
551 list_for_each_entry_reverse(ops, &pernet_list, list)
552 ops_exit_list(ops, &net_exit_list);
554 /* Free the net generic variables */
555 list_for_each_entry_reverse(ops, &pernet_list, list)
556 ops_free_list(ops, &net_exit_list);
558 up_read(&pernet_ops_rwsem);
560 /* Ensure there are no outstanding rcu callbacks using this
565 /* Finally it is safe to free my network namespace structure */
566 list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {
567 list_del_init(&net->exit_list);
568 dec_net_namespaces(net->ucounts);
569 put_user_ns(net->user_ns);
575 * net_ns_barrier - wait until concurrent net_cleanup_work is done
577 * cleanup_net runs from work queue and will first remove namespaces
578 * from the global list, then run net exit functions.
580 * Call this in module exit path to make sure that all netns
581 * ->exit ops have been invoked before the function is removed.
583 void net_ns_barrier(void)
585 down_write(&pernet_ops_rwsem);
586 up_write(&pernet_ops_rwsem);
588 EXPORT_SYMBOL(net_ns_barrier);
590 static DECLARE_WORK(net_cleanup_work, cleanup_net);
592 void __put_net(struct net *net)
594 /* Cleanup the network namespace in process context */
595 if (llist_add(&net->cleanup_list, &cleanup_list))
596 queue_work(netns_wq, &net_cleanup_work);
598 EXPORT_SYMBOL_GPL(__put_net);
600 struct net *get_net_ns_by_fd(int fd)
603 struct ns_common *ns;
606 file = proc_ns_fget(fd);
608 return ERR_CAST(file);
610 ns = get_proc_ns(file_inode(file));
611 if (ns->ops == &netns_operations)
612 net = get_net(container_of(ns, struct net, ns));
614 net = ERR_PTR(-EINVAL);
621 struct net *get_net_ns_by_fd(int fd)
623 return ERR_PTR(-EINVAL);
626 EXPORT_SYMBOL_GPL(get_net_ns_by_fd);
628 struct net *get_net_ns_by_pid(pid_t pid)
630 struct task_struct *tsk;
633 /* Lookup the network namespace */
634 net = ERR_PTR(-ESRCH);
636 tsk = find_task_by_vpid(pid);
638 struct nsproxy *nsproxy;
640 nsproxy = tsk->nsproxy;
642 net = get_net(nsproxy->net_ns);
648 EXPORT_SYMBOL_GPL(get_net_ns_by_pid);
650 static __net_init int net_ns_net_init(struct net *net)
653 net->ns.ops = &netns_operations;
655 return ns_alloc_inum(&net->ns);
658 static __net_exit void net_ns_net_exit(struct net *net)
660 ns_free_inum(&net->ns);
663 static struct pernet_operations __net_initdata net_ns_ops = {
664 .init = net_ns_net_init,
665 .exit = net_ns_net_exit,
668 static const struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = {
669 [NETNSA_NONE] = { .type = NLA_UNSPEC },
670 [NETNSA_NSID] = { .type = NLA_S32 },
671 [NETNSA_PID] = { .type = NLA_U32 },
672 [NETNSA_FD] = { .type = NLA_U32 },
673 [NETNSA_TARGET_NSID] = { .type = NLA_S32 },
676 static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh,
677 struct netlink_ext_ack *extack)
679 struct net *net = sock_net(skb->sk);
680 struct nlattr *tb[NETNSA_MAX + 1];
685 err = nlmsg_parse_deprecated(nlh, sizeof(struct rtgenmsg), tb,
686 NETNSA_MAX, rtnl_net_policy, extack);
689 if (!tb[NETNSA_NSID]) {
690 NL_SET_ERR_MSG(extack, "nsid is missing");
693 nsid = nla_get_s32(tb[NETNSA_NSID]);
695 if (tb[NETNSA_PID]) {
696 peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID]));
697 nla = tb[NETNSA_PID];
698 } else if (tb[NETNSA_FD]) {
699 peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD]));
702 NL_SET_ERR_MSG(extack, "Peer netns reference is missing");
706 NL_SET_BAD_ATTR(extack, nla);
707 NL_SET_ERR_MSG(extack, "Peer netns reference is invalid");
708 return PTR_ERR(peer);
711 spin_lock_bh(&net->nsid_lock);
712 if (__peernet2id(net, peer) >= 0) {
713 spin_unlock_bh(&net->nsid_lock);
715 NL_SET_BAD_ATTR(extack, nla);
716 NL_SET_ERR_MSG(extack,
717 "Peer netns already has a nsid assigned");
721 err = alloc_netid(net, peer, nsid);
722 spin_unlock_bh(&net->nsid_lock);
724 rtnl_net_notifyid(net, RTM_NEWNSID, err);
726 } else if (err == -ENOSPC && nsid >= 0) {
728 NL_SET_BAD_ATTR(extack, tb[NETNSA_NSID]);
729 NL_SET_ERR_MSG(extack, "The specified nsid is already used");
736 static int rtnl_net_get_size(void)
738 return NLMSG_ALIGN(sizeof(struct rtgenmsg))
739 + nla_total_size(sizeof(s32)) /* NETNSA_NSID */
740 + nla_total_size(sizeof(s32)) /* NETNSA_CURRENT_NSID */
744 struct net_fill_args {
754 static int rtnl_net_fill(struct sk_buff *skb, struct net_fill_args *args)
756 struct nlmsghdr *nlh;
757 struct rtgenmsg *rth;
759 nlh = nlmsg_put(skb, args->portid, args->seq, args->cmd, sizeof(*rth),
764 rth = nlmsg_data(nlh);
765 rth->rtgen_family = AF_UNSPEC;
767 if (nla_put_s32(skb, NETNSA_NSID, args->nsid))
768 goto nla_put_failure;
771 nla_put_s32(skb, NETNSA_CURRENT_NSID, args->ref_nsid))
772 goto nla_put_failure;
778 nlmsg_cancel(skb, nlh);
782 static int rtnl_net_valid_getid_req(struct sk_buff *skb,
783 const struct nlmsghdr *nlh,
785 struct netlink_ext_ack *extack)
789 if (!netlink_strict_get_check(skb))
790 return nlmsg_parse_deprecated(nlh, sizeof(struct rtgenmsg),
791 tb, NETNSA_MAX, rtnl_net_policy,
794 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct rtgenmsg), tb,
795 NETNSA_MAX, rtnl_net_policy,
800 for (i = 0; i <= NETNSA_MAX; i++) {
808 case NETNSA_TARGET_NSID:
811 NL_SET_ERR_MSG(extack, "Unsupported attribute in peer netns getid request");
819 static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh,
820 struct netlink_ext_ack *extack)
822 struct net *net = sock_net(skb->sk);
823 struct nlattr *tb[NETNSA_MAX + 1];
824 struct net_fill_args fillargs = {
825 .portid = NETLINK_CB(skb).portid,
826 .seq = nlh->nlmsg_seq,
829 struct net *peer, *target = net;
834 err = rtnl_net_valid_getid_req(skb, nlh, tb, extack);
837 if (tb[NETNSA_PID]) {
838 peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID]));
839 nla = tb[NETNSA_PID];
840 } else if (tb[NETNSA_FD]) {
841 peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD]));
843 } else if (tb[NETNSA_NSID]) {
844 peer = get_net_ns_by_id(net, nla_get_s32(tb[NETNSA_NSID]));
846 peer = ERR_PTR(-ENOENT);
847 nla = tb[NETNSA_NSID];
849 NL_SET_ERR_MSG(extack, "Peer netns reference is missing");
854 NL_SET_BAD_ATTR(extack, nla);
855 NL_SET_ERR_MSG(extack, "Peer netns reference is invalid");
856 return PTR_ERR(peer);
859 if (tb[NETNSA_TARGET_NSID]) {
860 int id = nla_get_s32(tb[NETNSA_TARGET_NSID]);
862 target = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, id);
863 if (IS_ERR(target)) {
864 NL_SET_BAD_ATTR(extack, tb[NETNSA_TARGET_NSID]);
865 NL_SET_ERR_MSG(extack,
866 "Target netns reference is invalid");
867 err = PTR_ERR(target);
870 fillargs.add_ref = true;
871 fillargs.ref_nsid = peernet2id(net, peer);
874 msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL);
880 fillargs.nsid = peernet2id(target, peer);
881 err = rtnl_net_fill(msg, &fillargs);
885 err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid);
891 if (fillargs.add_ref)
897 struct rtnl_net_dump_cb {
901 struct net_fill_args fillargs;
906 static int rtnl_net_dumpid_one(int id, void *peer, void *data)
908 struct rtnl_net_dump_cb *net_cb = (struct rtnl_net_dump_cb *)data;
911 if (net_cb->idx < net_cb->s_idx)
914 net_cb->fillargs.nsid = id;
915 if (net_cb->fillargs.add_ref)
916 net_cb->fillargs.ref_nsid = __peernet2id(net_cb->ref_net, peer);
917 ret = rtnl_net_fill(net_cb->skb, &net_cb->fillargs);
926 static int rtnl_valid_dump_net_req(const struct nlmsghdr *nlh, struct sock *sk,
927 struct rtnl_net_dump_cb *net_cb,
928 struct netlink_callback *cb)
930 struct netlink_ext_ack *extack = cb->extack;
931 struct nlattr *tb[NETNSA_MAX + 1];
934 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct rtgenmsg), tb,
935 NETNSA_MAX, rtnl_net_policy,
940 for (i = 0; i <= NETNSA_MAX; i++) {
944 if (i == NETNSA_TARGET_NSID) {
947 net = rtnl_get_net_ns_capable(sk, nla_get_s32(tb[i]));
949 NL_SET_BAD_ATTR(extack, tb[i]);
950 NL_SET_ERR_MSG(extack,
951 "Invalid target network namespace id");
954 net_cb->fillargs.add_ref = true;
955 net_cb->ref_net = net_cb->tgt_net;
956 net_cb->tgt_net = net;
958 NL_SET_BAD_ATTR(extack, tb[i]);
959 NL_SET_ERR_MSG(extack,
960 "Unsupported attribute in dump request");
968 static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
970 struct rtnl_net_dump_cb net_cb = {
971 .tgt_net = sock_net(skb->sk),
974 .portid = NETLINK_CB(cb->skb).portid,
975 .seq = cb->nlh->nlmsg_seq,
976 .flags = NLM_F_MULTI,
980 .s_idx = cb->args[0],
984 if (cb->strict_check) {
985 err = rtnl_valid_dump_net_req(cb->nlh, skb->sk, &net_cb, cb);
990 spin_lock_bh(&net_cb.tgt_net->nsid_lock);
991 if (net_cb.fillargs.add_ref &&
992 !net_eq(net_cb.ref_net, net_cb.tgt_net) &&
993 !spin_trylock_bh(&net_cb.ref_net->nsid_lock)) {
994 spin_unlock_bh(&net_cb.tgt_net->nsid_lock);
998 idr_for_each(&net_cb.tgt_net->netns_ids, rtnl_net_dumpid_one, &net_cb);
999 if (net_cb.fillargs.add_ref &&
1000 !net_eq(net_cb.ref_net, net_cb.tgt_net))
1001 spin_unlock_bh(&net_cb.ref_net->nsid_lock);
1002 spin_unlock_bh(&net_cb.tgt_net->nsid_lock);
1004 cb->args[0] = net_cb.idx;
1006 if (net_cb.fillargs.add_ref)
1007 put_net(net_cb.tgt_net);
1008 return err < 0 ? err : skb->len;
1011 static void rtnl_net_notifyid(struct net *net, int cmd, int id)
1013 struct net_fill_args fillargs = {
1017 struct sk_buff *msg;
1020 msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL);
1024 err = rtnl_net_fill(msg, &fillargs);
1028 rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0);
1034 rtnl_set_sk_err(net, RTNLGRP_NSID, err);
1037 static int __init net_ns_init(void)
1039 struct net_generic *ng;
1041 #ifdef CONFIG_NET_NS
1042 net_cachep = kmem_cache_create("net_namespace", sizeof(struct net),
1044 SLAB_PANIC|SLAB_ACCOUNT, NULL);
1046 /* Create workqueue for cleanup */
1047 netns_wq = create_singlethread_workqueue("netns");
1049 panic("Could not create netns workq");
1052 ng = net_alloc_generic();
1054 panic("Could not allocate generic netns");
1056 rcu_assign_pointer(init_net.gen, ng);
1058 down_write(&pernet_ops_rwsem);
1059 if (setup_net(&init_net, &init_user_ns))
1060 panic("Could not setup the initial network namespace");
1062 init_net_initialized = true;
1063 up_write(&pernet_ops_rwsem);
1065 if (register_pernet_subsys(&net_ns_ops))
1066 panic("Could not register network namespace subsystems");
1068 rtnl_register(PF_UNSPEC, RTM_NEWNSID, rtnl_net_newid, NULL,
1069 RTNL_FLAG_DOIT_UNLOCKED);
1070 rtnl_register(PF_UNSPEC, RTM_GETNSID, rtnl_net_getid, rtnl_net_dumpid,
1071 RTNL_FLAG_DOIT_UNLOCKED);
1076 pure_initcall(net_ns_init);
1078 #ifdef CONFIG_NET_NS
1079 static int __register_pernet_operations(struct list_head *list,
1080 struct pernet_operations *ops)
1084 LIST_HEAD(net_exit_list);
1086 list_add_tail(&ops->list, list);
1087 if (ops->init || (ops->id && ops->size)) {
1088 /* We held write locked pernet_ops_rwsem, and parallel
1089 * setup_net() and cleanup_net() are not possible.
1092 error = ops_init(ops, net);
1095 list_add_tail(&net->exit_list, &net_exit_list);
1101 /* If I have an error cleanup all namespaces I initialized */
1102 list_del(&ops->list);
1103 ops_exit_list(ops, &net_exit_list);
1104 ops_free_list(ops, &net_exit_list);
1108 static void __unregister_pernet_operations(struct pernet_operations *ops)
1111 LIST_HEAD(net_exit_list);
1113 list_del(&ops->list);
1114 /* See comment in __register_pernet_operations() */
1116 list_add_tail(&net->exit_list, &net_exit_list);
1117 ops_exit_list(ops, &net_exit_list);
1118 ops_free_list(ops, &net_exit_list);
1123 static int __register_pernet_operations(struct list_head *list,
1124 struct pernet_operations *ops)
1126 if (!init_net_initialized) {
1127 list_add_tail(&ops->list, list);
1131 return ops_init(ops, &init_net);
1134 static void __unregister_pernet_operations(struct pernet_operations *ops)
1136 if (!init_net_initialized) {
1137 list_del(&ops->list);
1139 LIST_HEAD(net_exit_list);
1140 list_add(&init_net.exit_list, &net_exit_list);
1141 ops_exit_list(ops, &net_exit_list);
1142 ops_free_list(ops, &net_exit_list);
1146 #endif /* CONFIG_NET_NS */
1148 static DEFINE_IDA(net_generic_ids);
1150 static int register_pernet_operations(struct list_head *list,
1151 struct pernet_operations *ops)
1156 error = ida_alloc_min(&net_generic_ids, MIN_PERNET_OPS_ID,
1161 max_gen_ptrs = max(max_gen_ptrs, *ops->id + 1);
1163 error = __register_pernet_operations(list, ops);
1167 ida_free(&net_generic_ids, *ops->id);
1173 static void unregister_pernet_operations(struct pernet_operations *ops)
1175 __unregister_pernet_operations(ops);
1178 ida_free(&net_generic_ids, *ops->id);
1182 * register_pernet_subsys - register a network namespace subsystem
1183 * @ops: pernet operations structure for the subsystem
1185 * Register a subsystem which has init and exit functions
1186 * that are called when network namespaces are created and
1187 * destroyed respectively.
1189 * When registered all network namespace init functions are
1190 * called for every existing network namespace. Allowing kernel
1191 * modules to have a race free view of the set of network namespaces.
1193 * When a new network namespace is created all of the init
1194 * methods are called in the order in which they were registered.
1196 * When a network namespace is destroyed all of the exit methods
1197 * are called in the reverse of the order with which they were
1200 int register_pernet_subsys(struct pernet_operations *ops)
1203 down_write(&pernet_ops_rwsem);
1204 error = register_pernet_operations(first_device, ops);
1205 up_write(&pernet_ops_rwsem);
1208 EXPORT_SYMBOL_GPL(register_pernet_subsys);
1211 * unregister_pernet_subsys - unregister a network namespace subsystem
1212 * @ops: pernet operations structure to manipulate
1214 * Remove the pernet operations structure from the list to be
1215 * used when network namespaces are created or destroyed. In
1216 * addition run the exit method for all existing network
1219 void unregister_pernet_subsys(struct pernet_operations *ops)
1221 down_write(&pernet_ops_rwsem);
1222 unregister_pernet_operations(ops);
1223 up_write(&pernet_ops_rwsem);
1225 EXPORT_SYMBOL_GPL(unregister_pernet_subsys);
1228 * register_pernet_device - register a network namespace device
1229 * @ops: pernet operations structure for the subsystem
1231 * Register a device which has init and exit functions
1232 * that are called when network namespaces are created and
1233 * destroyed respectively.
1235 * When registered all network namespace init functions are
1236 * called for every existing network namespace. Allowing kernel
1237 * modules to have a race free view of the set of network namespaces.
1239 * When a new network namespace is created all of the init
1240 * methods are called in the order in which they were registered.
1242 * When a network namespace is destroyed all of the exit methods
1243 * are called in the reverse of the order with which they were
1246 int register_pernet_device(struct pernet_operations *ops)
1249 down_write(&pernet_ops_rwsem);
1250 error = register_pernet_operations(&pernet_list, ops);
1251 if (!error && (first_device == &pernet_list))
1252 first_device = &ops->list;
1253 up_write(&pernet_ops_rwsem);
1256 EXPORT_SYMBOL_GPL(register_pernet_device);
1259 * unregister_pernet_device - unregister a network namespace netdevice
1260 * @ops: pernet operations structure to manipulate
1262 * Remove the pernet operations structure from the list to be
1263 * used when network namespaces are created or destroyed. In
1264 * addition run the exit method for all existing network
1267 void unregister_pernet_device(struct pernet_operations *ops)
1269 down_write(&pernet_ops_rwsem);
1270 if (&ops->list == first_device)
1271 first_device = first_device->next;
1272 unregister_pernet_operations(ops);
1273 up_write(&pernet_ops_rwsem);
1275 EXPORT_SYMBOL_GPL(unregister_pernet_device);
1277 #ifdef CONFIG_NET_NS
1278 static struct ns_common *netns_get(struct task_struct *task)
1280 struct net *net = NULL;
1281 struct nsproxy *nsproxy;
1284 nsproxy = task->nsproxy;
1286 net = get_net(nsproxy->net_ns);
1289 return net ? &net->ns : NULL;
1292 static inline struct net *to_net_ns(struct ns_common *ns)
1294 return container_of(ns, struct net, ns);
1297 static void netns_put(struct ns_common *ns)
1299 put_net(to_net_ns(ns));
1302 static int netns_install(struct nsproxy *nsproxy, struct ns_common *ns)
1304 struct net *net = to_net_ns(ns);
1306 if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) ||
1307 !ns_capable(current_user_ns(), CAP_SYS_ADMIN))
1310 put_net(nsproxy->net_ns);
1311 nsproxy->net_ns = get_net(net);
1315 static struct user_namespace *netns_owner(struct ns_common *ns)
1317 return to_net_ns(ns)->user_ns;
1320 const struct proc_ns_operations netns_operations = {
1322 .type = CLONE_NEWNET,
1325 .install = netns_install,
1326 .owner = netns_owner,