Release 4.11 net/netfilter/nft_set_hash.c
/*
* Copyright (c) 2008-2014 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/log2.h>
#include <linux/jhash.h>
#include <linux/netlink.h>
#include <linux/workqueue.h>
#include <linux/rhashtable.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
/* We target a hash table size of 4, element hint is 75% of final size */
#define NFT_HASH_ELEMENT_HINT 3
struct nft_hash {
struct rhashtable ht;
struct delayed_work gc_work;
};
struct nft_hash_elem {
struct rhash_head node;
struct nft_set_ext ext;
};
struct nft_hash_cmp_arg {
const struct nft_set *set;
const u32 *key;
u8 genmask;
};
static const struct rhashtable_params nft_hash_params;
static inline u32 nft_hash_key(const void *data, u32 len, u32 seed)
{
const struct nft_hash_cmp_arg *arg = data;
return jhash(arg->key, len, seed);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 38 | 100.00% | 1 | 100.00% |
Total | 38 | 100.00% | 1 | 100.00% |
static inline u32 nft_hash_obj(const void *data, u32 len, u32 seed)
{
const struct nft_hash_elem *he = data;
return jhash(nft_set_ext_key(&he->ext), len, seed);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 42 | 100.00% | 2 | 100.00% |
Total | 42 | 100.00% | 2 | 100.00% |
static inline int nft_hash_cmp(struct rhashtable_compare_arg *arg,
const void *ptr)
{
const struct nft_hash_cmp_arg *x = arg->key;
const struct nft_hash_elem *he = ptr;
if (memcmp(nft_set_ext_key(&he->ext), x->key, x->set->klen))
return 1;
if (nft_set_elem_expired(&he->ext))
return 1;
if (!nft_set_elem_active(&he->ext, x->genmask))
return 1;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 95 | 100.00% | 5 | 100.00% |
Total | 95 | 100.00% | 5 | 100.00% |
static bool nft_hash_lookup(const struct net *net, const struct nft_set *set,
const u32 *key, const struct nft_set_ext **ext)
{
struct nft_hash *priv = nft_set_priv(set);
const struct nft_hash_elem *he;
struct nft_hash_cmp_arg arg = {
.genmask = nft_genmask_cur(net),
.set = set,
.key = key,
};
he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params);
if (he != NULL)
*ext = &he->ext;
return !!he;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 73 | 70.19% | 7 | 70.00% |
Thomas Graf | 21 | 20.19% | 1 | 10.00% |
Pablo Neira Ayuso | 7 | 6.73% | 1 | 10.00% |
Herbert Xu | 3 | 2.88% | 1 | 10.00% |
Total | 104 | 100.00% | 10 | 100.00% |
static bool nft_hash_update(struct nft_set *set, const u32 *key,
void *(*new)(struct nft_set *,
const struct nft_expr *,
struct nft_regs *regs),
const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_set_ext **ext)
{
struct nft_hash *priv = nft_set_priv(set);
struct nft_hash_elem *he, *prev;
struct nft_hash_cmp_arg arg = {
.genmask = NFT_GENMASK_ANY,
.set = set,
.key = key,
};
he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params);
if (he != NULL)
goto out;
he = new(set, expr, regs);
if (he == NULL)
goto err1;
prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
nft_hash_params);
if (IS_ERR(prev))
goto err2;
/* Another cpu may race to insert the element with the same key */
if (prev) {
nft_set_elem_destroy(set, he, true);
he = prev;
}
out:
*ext = &he->ext;
return true;
err2:
nft_set_elem_destroy(set, he, true);
err1:
return false;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 183 | 83.94% | 3 | 60.00% |
Liping Zhang | 35 | 16.06% | 2 | 40.00% |
Total | 218 | 100.00% | 5 | 100.00% |
static int nft_hash_insert(const struct net *net, const struct nft_set *set,
const struct nft_set_elem *elem,
struct nft_set_ext **ext)
{
struct nft_hash *priv = nft_set_priv(set);
struct nft_hash_elem *he = elem->priv;
struct nft_hash_cmp_arg arg = {
.genmask = nft_genmask_next(net),
.set = set,
.key = elem->key.val.data,
};
struct nft_hash_elem *prev;
prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
nft_hash_params);
if (IS_ERR(prev))
return PTR_ERR(prev);
if (prev) {
*ext = &prev->ext;
return -EEXIST;
}
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 77 | 55.80% | 7 | 63.64% |
Pablo Neira Ayuso | 55 | 39.86% | 2 | 18.18% |
Thomas Graf | 3 | 2.17% | 1 | 9.09% |
Herbert Xu | 3 | 2.17% | 1 | 9.09% |
Total | 138 | 100.00% | 11 | 100.00% |
static void nft_hash_activate(const struct net *net, const struct nft_set *set,
const struct nft_set_elem *elem)
{
struct nft_hash_elem *he = elem->priv;
nft_set_elem_change_active(net, set, &he->ext);
nft_set_elem_clear_busy(&he->ext);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 44 | 83.02% | 5 | 71.43% |
Pablo Neira Ayuso | 8 | 15.09% | 1 | 14.29% |
Thomas Graf | 1 | 1.89% | 1 | 14.29% |
Total | 53 | 100.00% | 7 | 100.00% |
static bool nft_hash_flush(const struct net *net,
const struct nft_set *set, void *priv)
{
struct nft_hash_elem *he = priv;
if (!nft_set_elem_mark_busy(&he->ext) ||
!nft_is_active(net, &he->ext)) {
nft_set_elem_change_active(net, set, &he->ext);
return true;
}
return false;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 71 | 100.00% | 2 | 100.00% |
Total | 71 | 100.00% | 2 | 100.00% |
static void *nft_hash_deactivate(const struct net *net,
const struct nft_set *set,
const struct nft_set_elem *elem)
{
struct nft_hash *priv = nft_set_priv(set);
struct nft_hash_elem *he;
struct nft_hash_cmp_arg arg = {
.genmask = nft_genmask_next(net),
.set = set,
.key = elem->key.val.data,
};
rcu_read_lock();
he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params);
if (he != NULL &&
!nft_hash_flush(net, set, he))
he = NULL;
rcu_read_unlock();
return he;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 81 | 71.05% | 9 | 64.29% |
Herbert Xu | 21 | 18.42% | 1 | 7.14% |
Pablo Neira Ayuso | 12 | 10.53% | 4 | 28.57% |
Total | 114 | 100.00% | 14 | 100.00% |
static void nft_hash_remove(const struct net *net,
const struct nft_set *set,
const struct nft_set_elem *elem)
{
struct nft_hash *priv = nft_set_priv(set);
struct nft_hash_elem *he = elem->priv;
rhashtable_remove_fast(&priv->ht, &he->node, nft_hash_params);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 50 | 86.21% | 4 | 66.67% |
Pablo Neira Ayuso | 6 | 10.34% | 1 | 16.67% |
Thomas Graf | 2 | 3.45% | 1 | 16.67% |
Total | 58 | 100.00% | 6 | 100.00% |
static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_set_iter *iter)
{
struct nft_hash *priv = nft_set_priv(set);
struct nft_hash_elem *he;
struct rhashtable_iter hti;
struct nft_set_elem elem;
int err;
err = rhashtable_walk_init(&priv->ht, &hti, GFP_KERNEL);
iter->err = err;
if (err)
return;
err = rhashtable_walk_start(&hti);
if (err && err != -EAGAIN) {
iter->err = err;
goto out;
}
while ((he = rhashtable_walk_next(&hti))) {
if (IS_ERR(he)) {
err = PTR_ERR(he);
if (err != -EAGAIN) {
iter->err = err;
goto out;
}
continue;
}
if (iter->count < iter->skip)
goto cont;
if (nft_set_elem_expired(&he->ext))
goto cont;
if (!nft_set_elem_active(&he->ext, iter->genmask))
goto cont;
elem.priv = he;
iter->err = iter->fn(ctx, set, iter, &elem);
if (iter->err < 0)
goto out;
cont:
iter->count++;
}
out:
rhashtable_walk_stop(&hti);
rhashtable_walk_exit(&hti);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 134 | 53.39% | 6 | 54.55% |
Herbert Xu | 107 | 42.63% | 2 | 18.18% |
Thomas Graf | 6 | 2.39% | 1 | 9.09% |
Bob Copeland | 2 | 0.80% | 1 | 9.09% |
Pablo Neira Ayuso | 2 | 0.80% | 1 | 9.09% |
Total | 251 | 100.00% | 11 | 100.00% |
static void nft_hash_gc(struct work_struct *work)
{
struct nft_set *set;
struct nft_hash_elem *he;
struct nft_hash *priv;
struct nft_set_gc_batch *gcb = NULL;
struct rhashtable_iter hti;
int err;
priv = container_of(work, struct nft_hash, gc_work.work);
set = nft_set_container_of(priv);
err = rhashtable_walk_init(&priv->ht, &hti, GFP_KERNEL);
if (err)
goto schedule;
err = rhashtable_walk_start(&hti);
if (err && err != -EAGAIN)
goto out;
while ((he = rhashtable_walk_next(&hti))) {
if (IS_ERR(he)) {
if (PTR_ERR(he) != -EAGAIN)
goto out;
continue;
}
if (!nft_set_elem_expired(&he->ext))
continue;
if (nft_set_elem_mark_busy(&he->ext))
continue;
gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC);
if (gcb == NULL)
goto out;
rhashtable_remove_fast(&priv->ht, &he->node, nft_hash_params);
atomic_dec(&set->nelems);
nft_set_gc_batch_add(gcb, he);
}
out:
rhashtable_walk_stop(&hti);
rhashtable_walk_exit(&hti);
nft_set_gc_batch_complete(gcb);
schedule:
queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
nft_set_gc_interval(set));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 247 | 99.20% | 2 | 66.67% |
Bob Copeland | 2 | 0.80% | 1 | 33.33% |
Total | 249 | 100.00% | 3 | 100.00% |
static unsigned int nft_hash_privsize(const struct nlattr * const nla[])
{
return sizeof(struct nft_hash);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 19 | 86.36% | 3 | 75.00% |
Thomas Graf | 3 | 13.64% | 1 | 25.00% |
Total | 22 | 100.00% | 4 | 100.00% |
static const struct rhashtable_params nft_hash_params = {
.head_offset = offsetof(struct nft_hash_elem, node),
.hashfn = nft_hash_key,
.obj_hashfn = nft_hash_obj,
.obj_cmpfn = nft_hash_cmp,
.automatic_shrinking = true,
};
static int nft_hash_init(const struct nft_set *set,
const struct nft_set_desc *desc,
const struct nlattr * const tb[])
{
struct nft_hash *priv = nft_set_priv(set);
struct rhashtable_params params = nft_hash_params;
int err;
params.nelem_hint = desc->size ?: NFT_HASH_ELEMENT_HINT;
params.key_len = set->klen;
err = rhashtable_init(&priv->ht, ¶ms);
if (err < 0)
return err;
INIT_DEFERRABLE_WORK(&priv->gc_work, nft_hash_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
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 99 | 81.15% | 6 | 75.00% |
Thomas Graf | 15 | 12.30% | 1 | 12.50% |
Herbert Xu | 8 | 6.56% | 1 | 12.50% |
Total | 122 | 100.00% | 8 | 100.00% |
static void nft_hash_elem_destroy(void *ptr, void *arg)
{
nft_set_elem_destroy((const struct nft_set *)arg, ptr, true);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Thomas Graf | 25 | 86.21% | 1 | 33.33% |
Patrick McHardy | 2 | 6.90% | 1 | 33.33% |
Liping Zhang | 2 | 6.90% | 1 | 33.33% |
Total | 29 | 100.00% | 3 | 100.00% |
static void nft_hash_destroy(const struct nft_set *set)
{
struct nft_hash *priv = nft_set_priv(set);
cancel_delayed_work_sync(&priv->gc_work);
rhashtable_free_and_destroy(&priv->ht, nft_hash_elem_destroy,
(void *)set);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 40 | 86.96% | 5 | 62.50% |
Thomas Graf | 6 | 13.04% | 3 | 37.50% |
Total | 46 | 100.00% | 8 | 100.00% |
static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features,
struct nft_set_estimate *est)
{
unsigned int esize;
esize = sizeof(struct nft_hash_elem);
if (desc->size) {
est->size = sizeof(struct nft_hash) +
roundup_pow_of_two(desc->size * 4 / 3) *
sizeof(struct nft_hash_elem *) +
desc->size * esize;
} else {
/* Resizing happens when the load drops below 30% or goes
* above 75%. The average of 52.5% load (approximated by 50%)
* is used for the size estimation of the hash buckets,
* meaning we calculate two buckets per element.
*/
est->size = esize + 2 * sizeof(struct nft_hash_elem *);
}
est->lookup = NFT_SET_CLASS_O_1;
est->space = NFT_SET_CLASS_O_N;
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 96 | 88.89% | 2 | 40.00% |
Pablo Neira Ayuso | 7 | 6.48% | 2 | 40.00% |
Thomas Graf | 5 | 4.63% | 1 | 20.00% |
Total | 108 | 100.00% | 5 | 100.00% |
static struct nft_set_ops nft_hash_ops __read_mostly = {
.privsize = nft_hash_privsize,
.elemsize = offsetof(struct nft_hash_elem, ext),
.estimate = nft_hash_estimate,
.init = nft_hash_init,
.destroy = nft_hash_destroy,
.insert = nft_hash_insert,
.activate = nft_hash_activate,
.deactivate = nft_hash_deactivate,
.flush = nft_hash_flush,
.remove = nft_hash_remove,
.lookup = nft_hash_lookup,
.update = nft_hash_update,
.walk = nft_hash_walk,
.features = NFT_SET_MAP | NFT_SET_OBJECT | NFT_SET_TIMEOUT,
.owner = THIS_MODULE,
};
static int __init nft_hash_module_init(void)
{
return nft_register_set(&nft_hash_ops);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 16 | 100.00% | 2 | 100.00% |
Total | 16 | 100.00% | 2 | 100.00% |
static void __exit nft_hash_module_exit(void)
{
nft_unregister_set(&nft_hash_ops);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 15 | 100.00% | 2 | 100.00% |
Total | 15 | 100.00% | 2 | 100.00% |
module_init(nft_hash_module_init);
module_exit(nft_hash_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_SET();
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Patrick McHardy | 1539 | 75.55% | 17 | 41.46% |
Pablo Neira Ayuso | 175 | 8.59% | 11 | 26.83% |
Herbert Xu | 173 | 8.49% | 3 | 7.32% |
Thomas Graf | 107 | 5.25% | 6 | 14.63% |
Liping Zhang | 37 | 1.82% | 2 | 4.88% |
Bob Copeland | 4 | 0.20% | 1 | 2.44% |
David S. Miller | 2 | 0.10% | 1 | 2.44% |
Total | 2037 | 100.00% | 41 | 100.00% |
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