Release 4.18 net/netfilter/nft_set_rbtree.c

/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>


struct nft_rbtree {
	
struct rb_root		root;
	
rwlock_t		lock;
	
seqcount_t		count;
	
struct delayed_work	gc_work;
};


struct nft_rbtree_elem {
	
struct rb_node		node;
	
struct nft_set_ext	ext;
};



static bool nft_rbtree_interval_end(const struct nft_rbtree_elem *rbe)
{
	return nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) &&
	       (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END);
}

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36
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1
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static bool nft_rbtree_equal(const struct nft_set *set, const void *this,
			     const struct nft_rbtree_elem *interval)
{
	return memcmp(this, nft_set_ext_key(&interval->ext), set->klen) == 0;
}

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static bool __nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
				const u32 *key, const struct nft_set_ext **ext,
				unsigned int seq)
{
	struct nft_rbtree *priv = nft_set_priv(set);
	const struct nft_rbtree_elem *rbe, *interval = NULL;
	u8 genmask = nft_genmask_cur(net);
	const struct rb_node *parent;
	const void *this;
	int d;

	parent = rcu_dereference_raw(priv->root.rb_node);
	while (parent != NULL) {
		if (read_seqcount_retry(&priv->count, seq))
			return false;

		rbe = rb_entry(parent, struct nft_rbtree_elem, node);

		this = nft_set_ext_key(&rbe->ext);
		d = memcmp(this, key, set->klen);
		if (d < 0) {
			parent = rcu_dereference_raw(parent->rb_left);
			if (interval &&
			    nft_rbtree_equal(set, this, interval) &&
			    nft_rbtree_interval_end(rbe) &&
			    !nft_rbtree_interval_end(interval))
				continue;
			interval = rbe;
		} else if (d > 0)
			parent = rcu_dereference_raw(parent->rb_right);
		else {
			if (!nft_set_elem_active(&rbe->ext, genmask)) {
				parent = rcu_dereference_raw(parent->rb_left);
				continue;
			}
			if (nft_rbtree_interval_end(rbe))
				goto out;

			*ext = &rbe->ext;
			return true;
		}
	}

	if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
	    nft_set_elem_active(&interval->ext, genmask) &&
	    !nft_rbtree_interval_end(interval)) {
		*ext = &interval->ext;
		return true;
	}
out:
	return false;
}

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Patrick McHardy
192
63.37%
6
46.15%
Pablo Neira Ayuso
74
24.42%
5
38.46%
Florian Westphal
36
11.88%
1
7.69%
Taehee Yoo
1
0.33%
1
7.69%
Total
303
100.00%
13
100.00%



static bool nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
			      const u32 *key, const struct nft_set_ext **ext)
{
	struct nft_rbtree *priv = nft_set_priv(set);
	unsigned int seq = read_seqcount_begin(&priv->count);
	bool ret;

	ret = __nft_rbtree_lookup(net, set, key, ext, seq);
	if (ret || !read_seqcount_retry(&priv->count, seq))
		return ret;

	read_lock_bh(&priv->lock);
	seq = read_seqcount_begin(&priv->count);
	ret = __nft_rbtree_lookup(net, set, key, ext, seq);
	read_unlock_bh(&priv->lock);

	return ret;
}

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Florian Westphal
121
91.67%
1
25.00%
Liping Zhang
4
3.03%
1
25.00%
Pablo Neira Ayuso
4
3.03%
1
25.00%
Patrick McHardy
3
2.27%
1
25.00%
Total
132
100.00%
4
100.00%



static bool __nft_rbtree_get(const struct net *net, const struct nft_set *set,
			     const u32 *key, struct nft_rbtree_elem **elem,
			     unsigned int seq, unsigned int flags, u8 genmask)
{
	struct nft_rbtree_elem *rbe, *interval = NULL;
	struct nft_rbtree *priv = nft_set_priv(set);
	const struct rb_node *parent;
	const void *this;
	int d;

	parent = rcu_dereference_raw(priv->root.rb_node);
	while (parent != NULL) {
		if (read_seqcount_retry(&priv->count, seq))
			return false;

		rbe = rb_entry(parent, struct nft_rbtree_elem, node);

		this = nft_set_ext_key(&rbe->ext);
		d = memcmp(this, key, set->klen);
		if (d < 0) {
			parent = rcu_dereference_raw(parent->rb_left);
			interval = rbe;
		} else if (d > 0) {
			parent = rcu_dereference_raw(parent->rb_right);
		} else {
			if (!nft_set_elem_active(&rbe->ext, genmask))
				parent = rcu_dereference_raw(parent->rb_left);

			if (!nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) ||
			    (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END) ==
			    (flags & NFT_SET_ELEM_INTERVAL_END)) {
				*elem = rbe;
				return true;
			}
			return false;
		}
	}

	if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
	    nft_set_elem_active(&interval->ext, genmask) &&
	    !nft_rbtree_interval_end(interval)) {
		*elem = interval;
		return true;
	}

	return false;
}

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293
100.00%
1
100.00%



static void *nft_rbtree_get(const struct net *net, const struct nft_set *set,
			    const struct nft_set_elem *elem, unsigned int flags)
{
	struct nft_rbtree *priv = nft_set_priv(set);
	unsigned int seq = read_seqcount_begin(&priv->count);
	struct nft_rbtree_elem *rbe = ERR_PTR(-ENOENT);
	const u32 *key = (const u32 *)&elem->key.val;
	u8 genmask = nft_genmask_cur(net);
	bool ret;

	ret = __nft_rbtree_get(net, set, key, &rbe, seq, flags, genmask);
	if (ret || !read_seqcount_retry(&priv->count, seq))
		return rbe;

	read_lock_bh(&priv->lock);
	seq = read_seqcount_begin(&priv->count);
	ret = __nft_rbtree_get(net, set, key, &rbe, seq, flags, genmask);
	if (!ret)
		rbe = ERR_PTR(-ENOENT);
	read_unlock_bh(&priv->lock);

	return rbe;
}

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190
100.00%
1
100.00%
Total
190
100.00%
1
100.00%



static int __nft_rbtree_insert(const struct net *net, const struct nft_set *set,
			       struct nft_rbtree_elem *new,
			       struct nft_set_ext **ext)
{
	struct nft_rbtree *priv = nft_set_priv(set);
	u8 genmask = nft_genmask_next(net);
	struct nft_rbtree_elem *rbe;
	struct rb_node *parent, **p;
	int d;

	parent = NULL;
	p = &priv->root.rb_node;
	while (*p != NULL) {
		parent = *p;
		rbe = rb_entry(parent, struct nft_rbtree_elem, node);
		d = memcmp(nft_set_ext_key(&rbe->ext),
			   nft_set_ext_key(&new->ext),
			   set->klen);
		if (d < 0)
			p = &parent->rb_left;
		else if (d > 0)
			p = &parent->rb_right;
		else {
			if (nft_rbtree_interval_end(rbe) &&
			    !nft_rbtree_interval_end(new)) {
				p = &parent->rb_left;
			} else if (!nft_rbtree_interval_end(rbe) &&
				   nft_rbtree_interval_end(new)) {
				p = &parent->rb_right;
			} else if (nft_set_elem_active(&rbe->ext, genmask)) {
				*ext = &rbe->ext;
				return -EEXIST;
			} else {
				p = &parent->rb_left;
			}
		}
	}
	rb_link_node_rcu(&new->node, parent, p);
	rb_insert_color(&new->node, &priv->root);
	return 0;
}

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Patrick McHardy
174
64.93%
4
44.44%
Pablo Neira Ayuso
93
34.70%
4
44.44%
Florian Westphal
1
0.37%
1
11.11%
Total
268
100.00%
9
100.00%



static int nft_rbtree_insert(const struct net *net, const struct nft_set *set,
			     const struct nft_set_elem *elem,
			     struct nft_set_ext **ext)
{
	struct nft_rbtree *priv = nft_set_priv(set);
	struct nft_rbtree_elem *rbe = elem->priv;
	int err;

	write_lock_bh(&priv->lock);
	write_seqcount_begin(&priv->count);
	err = __nft_rbtree_insert(net, set, rbe, ext);
	write_seqcount_end(&priv->count);
	write_unlock_bh(&priv->lock);

	return err;
}

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Patrick McHardy
42
42.00%
2
28.57%
Pablo Neira Ayuso
24
24.00%
3
42.86%
Liping Zhang
18
18.00%
1
14.29%
Florian Westphal
16
16.00%
1
14.29%
Total
100
100.00%
7
100.00%



static void nft_rbtree_remove(const struct net *net,
			      const struct nft_set *set,
			      const struct nft_set_elem *elem)
{
	struct nft_rbtree *priv = nft_set_priv(set);
	struct nft_rbtree_elem *rbe = elem->priv;

	write_lock_bh(&priv->lock);
	write_seqcount_begin(&priv->count);
	rb_erase(&rbe->node, &priv->root);
	write_seqcount_end(&priv->count);
	write_unlock_bh(&priv->lock);
}

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Patrick McHardy
50
56.82%
2
33.33%
Florian Westphal
16
18.18%
1
16.67%
Pablo Neira Ayuso
14
15.91%
2
33.33%
Liping Zhang
8
9.09%
1
16.67%
Total
88
100.00%
6
100.00%



static void nft_rbtree_activate(const struct net *net,
				const struct nft_set *set,
				const struct nft_set_elem *elem)
{
	struct nft_rbtree_elem *rbe = elem->priv;

	nft_set_elem_change_active(net, set, &rbe->ext);
	nft_set_elem_clear_busy(&rbe->ext);
}

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37
69.81%
2
50.00%
Pablo Neira Ayuso
16
30.19%
2
50.00%
Total
53
100.00%
4
100.00%



static bool nft_rbtree_flush(const struct net *net,
			     const struct nft_set *set, void *priv)
{
	struct nft_rbtree_elem *rbe = priv;

	if (!nft_set_elem_mark_busy(&rbe->ext) ||
	    !nft_is_active(net, &rbe->ext)) {
		nft_set_elem_change_active(net, set, &rbe->ext);
		return true;
	}
	return false;
}

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71
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3
100.00%



static void *nft_rbtree_deactivate(const struct net *net,
				   const struct nft_set *set,
				   const struct nft_set_elem *elem)
{
	const struct nft_rbtree *priv = nft_set_priv(set);
	const struct rb_node *parent = priv->root.rb_node;
	struct nft_rbtree_elem *rbe, *this = elem->priv;
	u8 genmask = nft_genmask_next(net);
	int d;

	while (parent != NULL) {
		rbe = rb_entry(parent, struct nft_rbtree_elem, node);

		d = memcmp(nft_set_ext_key(&rbe->ext), &elem->key.val,
					   set->klen);
		if (d < 0)
			parent = parent->rb_left;
		else if (d > 0)
			parent = parent->rb_right;
		else {
			if (!nft_set_elem_active(&rbe->ext, genmask)) {
				parent = parent->rb_left;
				continue;
			}
			if (nft_rbtree_interval_end(rbe) &&
			    !nft_rbtree_interval_end(this)) {
				parent = parent->rb_left;
				continue;
			} else if (!nft_rbtree_interval_end(rbe) &&
				   nft_rbtree_interval_end(this)) {
				parent = parent->rb_right;
				continue;
			}
			nft_rbtree_flush(net, set, rbe);
			return rbe;
		}
	}
	return NULL;
}

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Patrick McHardy
162
72.00%
5
55.56%
Pablo Neira Ayuso
63
28.00%
4
44.44%
Total
225
100.00%
9
100.00%



static void nft_rbtree_walk(const struct nft_ctx *ctx,
			    struct nft_set *set,
			    struct nft_set_iter *iter)
{
	struct nft_rbtree *priv = nft_set_priv(set);
	struct nft_rbtree_elem *rbe;
	struct nft_set_elem elem;
	struct rb_node *node;

	read_lock_bh(&priv->lock);
	for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) {
		rbe = rb_entry(node, struct nft_rbtree_elem, node);

		if (iter->count < iter->skip)
			goto cont;
		if (!nft_set_elem_active(&rbe->ext, iter->genmask))
			goto cont;

		elem.priv = rbe;

		iter->err = iter->fn(ctx, set, iter, &elem);
		if (iter->err < 0) {
			read_unlock_bh(&priv->lock);
			return;
		}
cont:
		iter->count++;
	}
	read_unlock_bh(&priv->lock);
}

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Patrick McHardy
152
84.44%
3
50.00%
Pablo Neira Ayuso
16
8.89%
2
33.33%
Liping Zhang
12
6.67%
1
16.67%
Total
180
100.00%
6
100.00%



static void nft_rbtree_gc(struct work_struct *work)
{
	struct nft_set_gc_batch *gcb = NULL;
	struct rb_node *node, *prev = NULL;
	struct nft_rbtree_elem *rbe;
	struct nft_rbtree *priv;
	struct nft_set *set;
	int i;

	priv = container_of(work, struct nft_rbtree, gc_work.work);
	set  = nft_set_container_of(priv);

	write_lock_bh(&priv->lock);
	write_seqcount_begin(&priv->count);
	for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) {
		rbe = rb_entry(node, struct nft_rbtree_elem, node);

		if (nft_rbtree_interval_end(rbe)) {
			prev = node;
			continue;
		}
		if (!nft_set_elem_expired(&rbe->ext))
			continue;
		if (nft_set_elem_mark_busy(&rbe->ext))
			continue;

		gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC);
		if (!gcb)
			break;

		atomic_dec(&set->nelems);
		nft_set_gc_batch_add(gcb, rbe);

		if (prev) {
			rbe = rb_entry(prev, struct nft_rbtree_elem, node);
			atomic_dec(&set->nelems);
			nft_set_gc_batch_add(gcb, rbe);
			prev = NULL;
		}
		node = rb_next(node);
		if (!node)
			break;
	}
	if (gcb) {
		for (i = 0; i < gcb->head.cnt; i++) {
			rbe = gcb->elems[i];
			rb_erase(&rbe->node, &priv->root);
		}
	}
	write_seqcount_end(&priv->count);
	write_unlock_bh(&priv->lock);

	nft_set_gc_batch_complete(gcb);

	queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
			   nft_set_gc_interval(set));
}

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Pablo Neira Ayuso
311
96.58%
1
50.00%
Taehee Yoo
11
3.42%
1
50.00%
Total
322
100.00%
2
100.00%



static unsigned int nft_rbtree_privsize(const struct nlattr * const nla[],
					const struct nft_set_desc *desc)
{
	return sizeof(struct nft_rbtree);
}

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22
78.57%
1
50.00%
Pablo Neira Ayuso
6
21.43%
1
50.00%
Total
28
100.00%
2
100.00%



static int nft_rbtree_init(const struct nft_set *set,
			   const struct nft_set_desc *desc,
			   const struct nlattr * const nla[])
{
	struct nft_rbtree *priv = nft_set_priv(set);

	rwlock_init(&priv->lock);
	seqcount_init(&priv->count);
	priv->root = RB_ROOT;

	INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rbtree_gc);
	if (set->flags & NFT_SET_TIMEOUT)
		queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
				   nft_set_gc_interval(set));

	return 0;
}

Contributors
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Patrick McHardy
45
47.87%
2
40.00%
Pablo Neira Ayuso
33
35.11%
1
20.00%
Liping Zhang
8
8.51%
1
20.00%
Florian Westphal
8
8.51%
1
20.00%
Total
94
100.00%
5
100.00%



static void nft_rbtree_destroy(const struct nft_set *set)
{
	struct nft_rbtree *priv = nft_set_priv(set);
	struct nft_rbtree_elem *rbe;
	struct rb_node *node;

	cancel_delayed_work_sync(&priv->gc_work);
	rcu_barrier();
	while ((node = priv->root.rb_node) != NULL) {
		rb_erase(node, &priv->root);
		rbe = rb_entry(node, struct nft_rbtree_elem, node);
		nft_set_elem_destroy(set, rbe, true);
	}
}

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Patrick McHardy
77
85.56%
2
40.00%
Pablo Neira Ayuso
8
8.89%
1
20.00%
Taehee Yoo
3
3.33%
1
20.00%
Liping Zhang
2
2.22%
1
20.00%
Total
90
100.00%
5
100.00%



static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features,
				struct nft_set_estimate *est)
{
	if (desc->size)
		est->size = sizeof(struct nft_rbtree) +
			    desc->size * sizeof(struct nft_rbtree_elem);
	else
		est->size = ~0;

	est->lookup = NFT_SET_CLASS_O_LOG_N;
	est->space  = NFT_SET_CLASS_O_N;

	return true;
}

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Patrick McHardy
55
79.71%
1
25.00%
Pablo Neira Ayuso
14
20.29%
3
75.00%
Total
69
100.00%
4
100.00%


struct nft_set_type nft_set_rbtree_type __read_mostly = {
	.owner		= THIS_MODULE,
	.features	= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_OBJECT | NFT_SET_TIMEOUT,
	.ops		= {
		.privsize	= nft_rbtree_privsize,
		.elemsize	= offsetof(struct nft_rbtree_elem, ext),
		.estimate	= nft_rbtree_estimate,
		.init		= nft_rbtree_init,
		.destroy	= nft_rbtree_destroy,
		.insert		= nft_rbtree_insert,
		.remove		= nft_rbtree_remove,
		.deactivate	= nft_rbtree_deactivate,
		.flush		= nft_rbtree_flush,
		.activate	= nft_rbtree_activate,
		.lookup		= nft_rbtree_lookup,
		.walk		= nft_rbtree_walk,
		.get		= nft_rbtree_get,
        },
};
Overall Contributors
Person
Tokens
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CommitProp
Pablo Neira Ayuso
1329
48.43%
22
57.89%
Patrick McHardy
1128
41.11%
10
26.32%
Florian Westphal
204
7.43%
1
2.63%
Liping Zhang
52
1.90%
2
5.26%
Phil Sutter
16
0.58%
1
2.63%
Taehee Yoo
15
0.55%
2
5.26%
Total
2744
100.00%
38
100.00%
Directory: net/netfilter

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