Release 4.11 net/core/net_namespace.c

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/workqueue.h>
#include <linux/rtnetlink.h>
#include <linux/cache.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/idr.h>
#include <linux/rculist.h>
#include <linux/nsproxy.h>
#include <linux/fs.h>
#include <linux/proc_ns.h>
#include <linux/file.h>
#include <linux/export.h>
#include <linux/user_namespace.h>
#include <linux/net_namespace.h>
#include <linux/sched/task.h>

#include <net/sock.h>
#include <net/netlink.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>

/*
 *      Our network namespace constructor/destructor lists
 */

static LIST_HEAD(pernet_list);

static struct list_head *first_device = &pernet_list;

DEFINE_MUTEX(net_mutex);


LIST_HEAD(net_namespace_list);

EXPORT_SYMBOL_GPL(net_namespace_list);


struct net init_net = {
	.dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head),
};

EXPORT_SYMBOL(init_net);


static bool init_net_initialized;


#define MIN_PERNET_OPS_ID	\
	((sizeof(struct net_generic) + sizeof(void *) - 1) / sizeof(void *))


#define INITIAL_NET_GEN_PTRS	13 
/* +1 for len +2 for rcu_head */


static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS;



static struct net_generic *net_alloc_generic(void)
{
	struct net_generic *ng;
	unsigned int generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]);

	ng = kzalloc(generic_size, GFP_KERNEL);
	if (ng)
		ng->s.len = max_gen_ptrs;

	return ng;
}

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static int net_assign_generic(struct net *net, unsigned int id, void *data)
{
	struct net_generic *ng, *old_ng;

	BUG_ON(!mutex_is_locked(&net_mutex));
	BUG_ON(id < MIN_PERNET_OPS_ID);

	old_ng = rcu_dereference_protected(net->gen,
					   lockdep_is_held(&net_mutex));
	if (old_ng->s.len > id) {
		old_ng->ptr[id] = data;
		return 0;
	}

	ng = net_alloc_generic();
	if (ng == NULL)
		return -ENOMEM;

	/*
         * Some synchronisation notes:
         *
         * The net_generic explores the net->gen array inside rcu
         * read section. Besides once set the net->gen->ptr[x]
         * pointer never changes (see rules in netns/generic.h).
         *
         * That said, we simply duplicate this array and schedule
         * the old copy for kfree after a grace period.
         */

	memcpy(&ng->ptr[MIN_PERNET_OPS_ID], &old_ng->ptr[MIN_PERNET_OPS_ID],
	       (old_ng->s.len - MIN_PERNET_OPS_ID) * sizeof(void *));
	ng->ptr[id] = data;

	rcu_assign_pointer(net->gen, ng);
	kfree_rcu(old_ng, s.rcu);
	return 0;
}

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Jiri Pirko
107
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43
26.22%
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Eric Dumazet
12
7.32%
2
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Lai Jiangshan
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static int ops_init(const struct pernet_operations *ops, struct net *net)
{
	int err = -ENOMEM;
	void *data = NULL;

	if (ops->id && ops->size) {
		data = kzalloc(ops->size, GFP_KERNEL);
		if (!data)
			goto out;

		err = net_assign_generic(net, *ops->id, data);
		if (err)
			goto cleanup;
	}
	err = 0;
	if (ops->init)
		err = ops->init(net);
	if (!err)
		return 0;

cleanup:
	kfree(data);

out:
	return err;
}

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Julian Anastasov
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static void ops_free(const struct pernet_operations *ops, struct net *net)
{
	if (ops->id && ops->size) {
		kfree(net_generic(net, *ops->id));
	}
}

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static void ops_exit_list(const struct pernet_operations *ops,
			  struct list_head *net_exit_list)
{
	struct net *net;
	if (ops->exit) {
		list_for_each_entry(net, net_exit_list, exit_list)
			ops->exit(net);
	}
	if (ops->exit_batch)
		ops->exit_batch(net_exit_list);
}

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static void ops_free_list(const struct pernet_operations *ops,
			  struct list_head *net_exit_list)
{
	struct net *net;
	if (ops->size && ops->id) {
		list_for_each_entry(net, net_exit_list, exit_list)
			ops_free(ops, net);
	}
}

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/* should be called with nsid_lock held */


static int alloc_netid(struct net *net, struct net *peer, int reqid)
{
	int min = 0, max = 0;

	if (reqid >= 0) {
		min = reqid;
		max = reqid + 1;
	}

	return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC);
}

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/* This function is used by idr_for_each(). If net is equal to peer, the
 * function returns the id so that idr_for_each() stops. Because we cannot
 * returns the id 0 (idr_for_each() will not stop), we return the magic value
 * NET_ID_ZERO (-1) for it.
 */

#define NET_ID_ZERO -1


static int net_eq_idr(int id, void *net, void *peer)
{
	if (net_eq(net, peer))
		return id ? : NET_ID_ZERO;
	return 0;
}

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/* Should be called with nsid_lock held. If a new id is assigned, the bool alloc
 * is set to true, thus the caller knows that the new id must be notified via
 * rtnl.
 */


static int __peernet2id_alloc(struct net *net, struct net *peer, bool *alloc)
{
	int id = idr_for_each(&net->netns_ids, net_eq_idr, peer);
	bool alloc_it = *alloc;

	*alloc = false;

	/* Magic value for id 0. */
	if (id == NET_ID_ZERO)
		return 0;
	if (id > 0)
		return id;

	if (alloc_it) {
		id = alloc_netid(net, peer, -1);
		*alloc = true;
		return id >= 0 ? id : NETNSA_NSID_NOT_ASSIGNED;
	}

	return NETNSA_NSID_NOT_ASSIGNED;
}

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/* should be called with nsid_lock held */


static int __peernet2id(struct net *net, struct net *peer)
{
	bool no = false;

	return __peernet2id_alloc(net, peer, &no);
}

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static void rtnl_net_notifyid(struct net *net, int cmd, int id);
/* This function returns the id of a peer netns. If no id is assigned, one will
 * be allocated and returned.
 */


int peernet2id_alloc(struct net *net, struct net *peer)
{
	bool alloc;
	int id;

	if (atomic_read(&net->count) == 0)
		return NETNSA_NSID_NOT_ASSIGNED;
	spin_lock_bh(&net->nsid_lock);
	alloc = atomic_read(&peer->count) == 0 ? false : true;
	id = __peernet2id_alloc(net, peer, &alloc);
	spin_unlock_bh(&net->nsid_lock);
	if (alloc && id >= 0)
		rtnl_net_notifyid(net, RTM_NEWNSID, id);
	return id;
}

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Nicolas Dichtel
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Américo Wang
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/* This function returns, if assigned, the id of a peer netns. */


int peernet2id(struct net *net, struct net *peer)
{
	int id;

	spin_lock_bh(&net->nsid_lock);
	id = __peernet2id(net, peer);
	spin_unlock_bh(&net->nsid_lock);
	return id;
}
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Nicolas Dichtel
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Américo Wang
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EXPORT_SYMBOL(peernet2id);

/* This function returns true is the peer netns has an id assigned into the
 * current netns.
 */


bool peernet_has_id(struct net *net, struct net *peer)
{
	return peernet2id(net, peer) >= 0;
}

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struct net *get_net_ns_by_id(struct net *net, int id)
{
	struct net *peer;

	if (id < 0)
		return NULL;

	rcu_read_lock();
	spin_lock_bh(&net->nsid_lock);
	peer = idr_find(&net->netns_ids, id);
	if (peer)
		get_net(peer);
	spin_unlock_bh(&net->nsid_lock);
	rcu_read_unlock();

	return peer;
}

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Nicolas Dichtel
69
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4
5.33%
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Paul Moore
2
2.67%
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75
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4
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/*
 * setup_net runs the initializers for the network namespace object.
 */


static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
{
	/* Must be called with net_mutex held */
	const struct pernet_operations *ops, *saved_ops;
	int error = 0;
	LIST_HEAD(net_exit_list);

	atomic_set(&net->count, 1);
	atomic_set(&net->passive, 1);
	net->dev_base_seq = 1;
	net->user_ns = user_ns;
	idr_init(&net->netns_ids);
	spin_lock_init(&net->nsid_lock);

	list_for_each_entry(ops, &pernet_list, list) {
		error = ops_init(ops, net);
		if (error < 0)
			goto out_undo;
	}
out:
	return error;

out_undo:
	/* Walk through the list backwards calling the exit functions
         * for the pernet modules whose init functions did not fail.
         */
	list_add(&net->exit_list, &net_exit_list);
	saved_ops = ops;
	list_for_each_entry_continue_reverse(ops, &pernet_list, list)
		ops_exit_list(ops, &net_exit_list);

	ops = saved_ops;
	list_for_each_entry_continue_reverse(ops, &pernet_list, list)
		ops_free_list(ops, &net_exit_list);

	rcu_barrier();
	goto out;
}


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10
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Pavel Emelyanov
10
5.62%
3
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Américo Wang
8
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Nicolas Dichtel
8
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Thomas Graf
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Daniel Lezcano
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#ifdef CONFIG_NET_NS


static struct ucounts *inc_net_namespaces(struct user_namespace *ns)
{
	return inc_ucount(ns, current_euid(), UCOUNT_NET_NAMESPACES);
}

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static void dec_net_namespaces(struct ucounts *ucounts)
{
	dec_ucount(ucounts, UCOUNT_NET_NAMESPACES);
}

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static struct kmem_cache *net_cachep;

static struct workqueue_struct *netns_wq;



static struct net *net_alloc(void)
{
	struct net *net = NULL;
	struct net_generic *ng;

	ng = net_alloc_generic();
	if (!ng)
		goto out;

	net = kmem_cache_zalloc(net_cachep, GFP_KERNEL);
	if (!net)
		goto out_free;

	rcu_assign_pointer(net->gen, ng);
out:
	return net;

out_free:
	kfree(ng);
	goto out;
}

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static void net_free(struct net *net)
{
	kfree(rcu_access_pointer(net->gen));
	kmem_cache_free(net_cachep, net);
}

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Eric Dumazet
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void net_drop_ns(void *p)
{
	struct net *ns = p;
	if (ns && atomic_dec_and_test(&ns->passive))
		net_free(ns);
}

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struct net *copy_net_ns(unsigned long flags,
			struct user_namespace *user_ns, struct net *old_net)
{
	struct ucounts *ucounts;
	struct net *net;
	int rv;

	if (!(flags & CLONE_NEWNET))
		return get_net(old_net);

	ucounts = inc_net_namespaces(user_ns);
	if (!ucounts)
		return ERR_PTR(-ENOSPC);

	net = net_alloc();
	if (!net) {
		dec_net_namespaces(ucounts);
		return ERR_PTR(-ENOMEM);
	}

	get_user_ns(user_ns);

	rv = mutex_lock_killable(&net_mutex);
	if (rv < 0) {
		net_free(net);
		dec_net_namespaces(ucounts);
		put_user_ns(user_ns);
		return ERR_PTR(rv);
	}

	net->ucounts = ucounts;
	rv = setup_net(net, user_ns);
	if (rv == 0) {
		rtnl_lock();
		list_add_tail_rcu(&net->list, &net_namespace_list);
		rtnl_unlock();
	}
	mutex_unlock(&net_mutex);
	if (rv < 0) {
		dec_net_namespaces(ucounts);
		put_user_ns(user_ns);
		net_drop_ns(net);
		return ERR_PTR(rv);
	}
	return net;
}

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Andrey Vagin
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Alexey Dobriyan
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14.15%
1
9.09%
Rob Landley
24
11.32%
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Daniel Lezcano
5
2.36%
1
9.09%
Al Viro
1
0.47%
1
9.09%
Johannes Berg
1
0.47%
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9.09%
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212
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static DEFINE_SPINLOCK(cleanup_list_lock);
static LIST_HEAD(cleanup_list);  /* Must hold cleanup_list_lock to touch */



static void cleanup_net(struct work_struct *work)
{
	const struct pernet_operations *ops;
	struct net *net, *tmp;
	struct list_head net_kill_list;
	LIST_HEAD(net_exit_list);

	/* Atomically snapshot the list of namespaces to cleanup */
	spin_lock_irq(&cleanup_list_lock);
	list_replace_init(&cleanup_list, &net_kill_list);
	spin_unlock_irq(&cleanup_list_lock);

	mutex_lock(&net_mutex);

	/* Don't let anyone else find us. */
	rtnl_lock();
	list_for_each_entry(net, &net_kill_list, cleanup_list) {
		list_del_rcu(&net->list);
		list_add_tail(&net->exit_list, &net_exit_list);
		for_each_net(tmp) {
			int id;

			spin_lock_bh(&tmp->nsid_lock);
			id = __peernet2id(tmp, net);
			if (id >= 0)
				idr_remove(&tmp->netns_ids, id);
			spin_unlock_bh(&tmp->nsid_lock);
			if (id >= 0)
				rtnl_net_notifyid(tmp, RTM_DELNSID, id);
		}
		spin_lock_bh(&net->nsid_lock);
		idr_destroy(&net->netns_ids);
		spin_unlock_bh(&net->nsid_lock);

	}
	rtnl_unlock();

	/*
         * Another CPU might be rcu-iterating the list, wait for it.
         * This needs to be before calling the exit() notifiers, so
         * the rcu_barrier() below isn't sufficient alone.
         */
	synchronize_rcu();

	/* Run all of the network namespace exit methods */
	list_for_each_entry_reverse(ops, &pernet_list, list)
		ops_exit_list(ops, &net_exit_list);

	/* Free the net generic variables */
	list_for_each_entry_reverse(ops, &pernet_list, list)
		ops_free_list(ops, &net_exit_list);

	mutex_unlock(&net_mutex);

	/* Ensure there are no outstanding rcu callbacks using this
         * network namespace.
         */
	rcu_barrier();

	/* Finally it is safe to free my network namespace structure */
	list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {
		list_del_init(&net->exit_list);
		dec_net_namespaces(net->ucounts);
		put_user_ns(net->user_ns);
		net_drop_ns(net);
	}
}
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77
28.00%
3
21.43%
Pavel Emelyanov
69
25.09%
1
7.14%
Américo Wang
8
2.91%
1
7.14%
Johannes Berg
5
1.82%
1
7.14%
Paul Moore
4
1.45%
1
7.14%
xiao jin
3
1.09%
1
7.14%
Al Viro
1
0.36%
1
7.14%
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275
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14
100.00%

static DECLARE_WORK(net_cleanup_work, cleanup_net);



void __put_net(struct net *net)
{
	/* Cleanup the network namespace in process context */
	unsigned long flags;

	spin_lock_irqsave(&cleanup_list_lock, flags);
	list_add(&net->cleanup_list, &cleanup_list);
	spin_unlock_irqrestore(&cleanup_list_lock, flags);

	queue_work(netns_wq, &net_cleanup_work);
}
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33.33%
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44.00%
1
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Benjamin Thery
3
6.00%
1
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50
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3
100.00%


EXPORT_SYMBOL_GPL(__put_net);



struct net *get_net_ns_by_fd(int fd)
{
	struct file *file;
	struct ns_common *ns;
	struct net *net;

	file = proc_ns_fget(fd);
	if (IS_ERR(file))
		return ERR_CAST(file);

	ns = get_proc_ns(file_inode(file));
	if (ns->ops == &netns_operations)
		net = get_net(container_of(ns, struct net, ns));
	else
		net = ERR_PTR(-EINVAL);

	fput(file);
	return net;
}

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Stephen Rothwell
57
59.38%
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38
39.58%
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71.43%
David Howells
1
1.04%
1
14.29%
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96
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#else


struct net *get_net_ns_by_fd(int fd)
{
	return ERR_PTR(-EINVAL);
}
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#endif

EXPORT_SYMBOL_GPL(get_net_ns_by_fd);



struct net *get_net_ns_by_pid(pid_t pid)
{
	struct task_struct *tsk;
	struct net *net;

	/* Lookup the network namespace */
	net = ERR_PTR(-ESRCH);
	rcu_read_lock();
	tsk = find_task_by_vpid(pid);
	if (tsk) {
		struct nsproxy *nsproxy;
		task_lock(tsk);
		nsproxy = tsk->nsproxy;
		if (nsproxy)
			net = get_net(nsproxy->net_ns);
		task_unlock(tsk);
	}
	rcu_read_unlock();
	return net;
}
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EXPORT_SYMBOL_GPL(get_net_ns_by_pid);



static __net_init int net_ns_net_init(struct net *net)
{
#ifdef CONFIG_NET_NS
	net->ns.ops = &netns_operations;
#endif
	return ns_alloc_inum(&net->ns);
}

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Prop
Commits
CommitProp
Eric W. Biedermann
19
54.29%
1
25.00%
Al Viro
16
45.71%
3
75.00%
Total
35
100.00%
4
100.00%



static __net_exit void net_ns_net_exit(struct net *net)
{
	ns_free_inum(&net->ns);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
17
85.00%
1
33.33%
Al Viro
3
15.00%
2
66.67%
Total
20
100.00%
3
100.00%


static struct pernet_operations __net_initdata net_ns_ops = {
	.init = net_ns_net_init,
	.exit = net_ns_net_exit,
};


static const struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = {
	[NETNSA_NONE]		= { .type = NLA_UNSPEC },
	[NETNSA_NSID]		= { .type = NLA_S32 },
	[NETNSA_PID]		= { .type = NLA_U32 },
	[NETNSA_FD]		= { .type = NLA_U32 },
};



static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	struct net *net = sock_net(skb->sk);
	struct nlattr *tb[NETNSA_MAX + 1];
	struct net *peer;
	int nsid, err;

	err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX,
			  rtnl_net_policy);
	if (err < 0)
		return err;
	if (!tb[NETNSA_NSID])
		return -EINVAL;
	nsid = nla_get_s32(tb[NETNSA_NSID]);

	if (tb[NETNSA_PID])
		peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID]));
	else if (tb[NETNSA_FD])
		peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD]));
	else
		return -EINVAL;
	if (IS_ERR(peer))
		return PTR_ERR(peer);

	spin_lock_bh(&net->nsid_lock);
	if (__peernet2id(net, peer) >= 0) {
		spin_unlock_bh(&net->nsid_lock);
		err = -EEXIST;
		goto out;
	}

	err = alloc_netid(net, peer, nsid);
	spin_unlock_bh(&net->nsid_lock);
	if (err >= 0) {
		rtnl_net_notifyid(net, RTM_NEWNSID, err);
		err = 0;
	}
out:
	put_net(peer);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
180
73.77%
4
36.36%
Eric W. Biedermann
31
12.70%
2
18.18%
Daniel Lezcano
11
4.51%
1
9.09%
Benjamin Thery
10
4.10%
1
9.09%
Américo Wang
6
2.46%
1
9.09%
Paul Moore
3
1.23%
1
9.09%
Stephen Hemminger
3
1.23%
1
9.09%
Total
244
100.00%
11
100.00%



static int rtnl_net_get_size(void)
{
	return NLMSG_ALIGN(sizeof(struct rtgenmsg))
	       + nla_total_size(sizeof(s32)) /* NETNSA_NSID */
	       ;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%



static int rtnl_net_fill(struct sk_buff *skb, u32 portid, u32 seq, int flags,
			 int cmd, struct net *net, int nsid)
{
	struct nlmsghdr *nlh;
	struct rtgenmsg *rth;

	nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rth), flags);
	if (!nlh)
		return -EMSGSIZE;

	rth = nlmsg_data(nlh);
	rth->rtgen_family = AF_UNSPEC;

	if (nla_put_s32(skb, NETNSA_NSID, nsid))
		goto nla_put_failure;

	nlmsg_end(skb, nlh);
	return 0;

nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
121
100.00%
3
100.00%
Total
121
100.00%
3
100.00%



static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	struct net *net = sock_net(skb->sk);
	struct nlattr *tb[NETNSA_MAX + 1];
	struct sk_buff *msg;
	struct net *peer;
	int err, id;

	err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX,
			  rtnl_net_policy);
	if (err < 0)
		return err;
	if (tb[NETNSA_PID])
		peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID]));
	else if (tb[NETNSA_FD])
		peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD]));
	else
		return -EINVAL;

	if (IS_ERR(peer))
		return PTR_ERR(