// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net>
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/log2.h>
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#include <linux/jhash.h>
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#include <linux/netlink.h>
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#include <linux/workqueue.h>
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#include <linux/rhashtable.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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/* We target a hash table size of 4, element hint is 75% of final size */
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#define NFT_RHASH_ELEMENT_HINT 3
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struct nft_rhash {
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struct rhashtable ht;
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struct delayed_work gc_work;
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};
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struct nft_rhash_elem {
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struct rhash_head node;
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struct nft_set_ext ext;
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};
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struct nft_rhash_cmp_arg {
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const struct nft_set *set;
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const u32 *key;
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u8 genmask;
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};
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static inline u32 nft_rhash_key(const void *data, u32 len, u32 seed)
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{
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const struct nft_rhash_cmp_arg *arg = data;
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return jhash(arg->key, len, seed);
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}
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static inline u32 nft_rhash_obj(const void *data, u32 len, u32 seed)
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{
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const struct nft_rhash_elem *he = data;
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return jhash(nft_set_ext_key(&he->ext), len, seed);
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}
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static inline int nft_rhash_cmp(struct rhashtable_compare_arg *arg,
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const void *ptr)
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{
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const struct nft_rhash_cmp_arg *x = arg->key;
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const struct nft_rhash_elem *he = ptr;
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if (memcmp(nft_set_ext_key(&he->ext), x->key, x->set->klen))
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return 1;
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if (nft_set_elem_expired(&he->ext))
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return 1;
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if (!nft_set_elem_active(&he->ext, x->genmask))
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return 1;
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return 0;
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}
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static const struct rhashtable_params nft_rhash_params = {
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.head_offset = offsetof(struct nft_rhash_elem, node),
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.hashfn = nft_rhash_key,
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.obj_hashfn = nft_rhash_obj,
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.obj_cmpfn = nft_rhash_cmp,
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.automatic_shrinking = true,
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};
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static bool nft_rhash_lookup(const struct net *net, const struct nft_set *set,
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const u32 *key, const struct nft_set_ext **ext)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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const struct nft_rhash_elem *he;
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struct nft_rhash_cmp_arg arg = {
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.genmask = nft_genmask_cur(net),
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.set = set,
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.key = key,
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};
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he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
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if (he != NULL)
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*ext = &he->ext;
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return !!he;
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}
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static void *nft_rhash_get(const struct net *net, const struct nft_set *set,
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const struct nft_set_elem *elem, unsigned int flags)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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struct nft_rhash_elem *he;
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struct nft_rhash_cmp_arg arg = {
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.genmask = nft_genmask_cur(net),
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.set = set,
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.key = elem->key.val.data,
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};
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he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
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if (he != NULL)
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return he;
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return ERR_PTR(-ENOENT);
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}
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static bool nft_rhash_update(struct nft_set *set, const u32 *key,
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void *(*new)(struct nft_set *,
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const struct nft_expr *,
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struct nft_regs *regs),
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const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_set_ext **ext)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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struct nft_rhash_elem *he, *prev;
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struct nft_rhash_cmp_arg arg = {
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.genmask = NFT_GENMASK_ANY,
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.set = set,
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.key = key,
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};
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he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
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if (he != NULL)
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goto out;
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he = new(set, expr, regs);
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if (he == NULL)
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goto err1;
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prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
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nft_rhash_params);
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if (IS_ERR(prev))
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goto err2;
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/* Another cpu may race to insert the element with the same key */
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if (prev) {
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nft_set_elem_destroy(set, he, true);
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atomic_dec(&set->nelems);
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he = prev;
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}
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out:
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*ext = &he->ext;
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return true;
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err2:
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nft_set_elem_destroy(set, he, true);
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atomic_dec(&set->nelems);
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err1:
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return false;
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}
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static int nft_rhash_insert(const struct net *net, const struct nft_set *set,
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const struct nft_set_elem *elem,
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struct nft_set_ext **ext)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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struct nft_rhash_elem *he = elem->priv;
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struct nft_rhash_cmp_arg arg = {
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.genmask = nft_genmask_next(net),
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.set = set,
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.key = elem->key.val.data,
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};
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struct nft_rhash_elem *prev;
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prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
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nft_rhash_params);
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if (IS_ERR(prev))
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return PTR_ERR(prev);
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if (prev) {
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*ext = &prev->ext;
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return -EEXIST;
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}
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return 0;
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}
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static void nft_rhash_activate(const struct net *net, const struct nft_set *set,
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const struct nft_set_elem *elem)
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{
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struct nft_rhash_elem *he = elem->priv;
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nft_set_elem_change_active(net, set, &he->ext);
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nft_set_elem_clear_busy(&he->ext);
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}
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static bool nft_rhash_flush(const struct net *net,
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const struct nft_set *set, void *priv)
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{
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struct nft_rhash_elem *he = priv;
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if (!nft_set_elem_mark_busy(&he->ext) ||
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!nft_is_active(net, &he->ext)) {
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nft_set_elem_change_active(net, set, &he->ext);
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return true;
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}
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return false;
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}
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static void *nft_rhash_deactivate(const struct net *net,
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const struct nft_set *set,
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const struct nft_set_elem *elem)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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struct nft_rhash_elem *he;
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struct nft_rhash_cmp_arg arg = {
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.genmask = nft_genmask_next(net),
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.set = set,
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.key = elem->key.val.data,
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};
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rcu_read_lock();
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he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
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if (he != NULL &&
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!nft_rhash_flush(net, set, he))
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he = NULL;
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rcu_read_unlock();
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return he;
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}
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static void nft_rhash_remove(const struct net *net,
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const struct nft_set *set,
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const struct nft_set_elem *elem)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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struct nft_rhash_elem *he = elem->priv;
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rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params);
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}
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static bool nft_rhash_delete(const struct nft_set *set,
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const u32 *key)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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struct nft_rhash_cmp_arg arg = {
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.genmask = NFT_GENMASK_ANY,
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.set = set,
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.key = key,
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};
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struct nft_rhash_elem *he;
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he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
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if (he == NULL)
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return false;
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return rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params) == 0;
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}
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static void nft_rhash_walk(const struct nft_ctx *ctx, struct nft_set *set,
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struct nft_set_iter *iter)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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struct nft_rhash_elem *he;
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struct rhashtable_iter hti;
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struct nft_set_elem elem;
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rhashtable_walk_enter(&priv->ht, &hti);
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rhashtable_walk_start(&hti);
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while ((he = rhashtable_walk_next(&hti))) {
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if (IS_ERR(he)) {
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if (PTR_ERR(he) != -EAGAIN) {
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iter->err = PTR_ERR(he);
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break;
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}
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continue;
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}
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if (iter->count < iter->skip)
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goto cont;
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if (nft_set_elem_expired(&he->ext))
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goto cont;
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if (!nft_set_elem_active(&he->ext, iter->genmask))
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goto cont;
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elem.priv = he;
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iter->err = iter->fn(ctx, set, iter, &elem);
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if (iter->err < 0)
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break;
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cont:
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iter->count++;
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}
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rhashtable_walk_stop(&hti);
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rhashtable_walk_exit(&hti);
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}
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static void nft_rhash_gc(struct work_struct *work)
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{
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struct nft_set *set;
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struct nft_rhash_elem *he;
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struct nft_rhash *priv;
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struct nft_set_gc_batch *gcb = NULL;
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struct rhashtable_iter hti;
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priv = container_of(work, struct nft_rhash, gc_work.work);
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set = nft_set_container_of(priv);
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rhashtable_walk_enter(&priv->ht, &hti);
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rhashtable_walk_start(&hti);
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while ((he = rhashtable_walk_next(&hti))) {
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if (IS_ERR(he)) {
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if (PTR_ERR(he) != -EAGAIN)
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break;
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continue;
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}
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if (nft_set_ext_exists(&he->ext, NFT_SET_EXT_EXPR)) {
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struct nft_expr *expr = nft_set_ext_expr(&he->ext);
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if (expr->ops->gc &&
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expr->ops->gc(read_pnet(&set->net), expr))
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goto gc;
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}
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if (!nft_set_elem_expired(&he->ext))
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continue;
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gc:
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if (nft_set_elem_mark_busy(&he->ext))
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continue;
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gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC);
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if (gcb == NULL)
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break;
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rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params);
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atomic_dec(&set->nelems);
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nft_set_gc_batch_add(gcb, he);
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}
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rhashtable_walk_stop(&hti);
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rhashtable_walk_exit(&hti);
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nft_set_gc_batch_complete(gcb);
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queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
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nft_set_gc_interval(set));
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}
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static u64 nft_rhash_privsize(const struct nlattr * const nla[],
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const struct nft_set_desc *desc)
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{
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return sizeof(struct nft_rhash);
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}
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static void nft_rhash_gc_init(const struct nft_set *set)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
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nft_set_gc_interval(set));
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}
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static int nft_rhash_init(const struct nft_set *set,
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const struct nft_set_desc *desc,
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const struct nlattr * const tb[])
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{
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struct nft_rhash *priv = nft_set_priv(set);
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struct rhashtable_params params = nft_rhash_params;
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int err;
|
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params.nelem_hint = desc->size ?: NFT_RHASH_ELEMENT_HINT;
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params.key_len = set->klen;
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err = rhashtable_init(&priv->ht, ¶ms);
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if (err < 0)
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return err;
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INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc);
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if (set->flags & NFT_SET_TIMEOUT)
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nft_rhash_gc_init(set);
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return 0;
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}
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static void nft_rhash_elem_destroy(void *ptr, void *arg)
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{
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nft_set_elem_destroy(arg, ptr, true);
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}
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static void nft_rhash_destroy(const struct nft_set *set)
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{
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struct nft_rhash *priv = nft_set_priv(set);
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cancel_delayed_work_sync(&priv->gc_work);
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rcu_barrier();
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rhashtable_free_and_destroy(&priv->ht, nft_rhash_elem_destroy,
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(void *)set);
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}
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/* Number of buckets is stored in u32, so cap our result to 1U<<31 */
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#define NFT_MAX_BUCKETS (1U << 31)
|
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static u32 nft_hash_buckets(u32 size)
|
{
|
u64 val = div_u64((u64)size * 4, 3);
|
|
if (val >= NFT_MAX_BUCKETS)
|
return NFT_MAX_BUCKETS;
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|
return roundup_pow_of_two(val);
|
}
|
|
static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features,
|
struct nft_set_estimate *est)
|
{
|
est->size = ~0;
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est->lookup = NFT_SET_CLASS_O_1;
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est->space = NFT_SET_CLASS_O_N;
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|
return true;
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}
|
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struct nft_hash {
|
u32 seed;
|
u32 buckets;
|
struct hlist_head table[];
|
};
|
|
struct nft_hash_elem {
|
struct hlist_node node;
|
struct nft_set_ext ext;
|
};
|
|
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);
|
u8 genmask = nft_genmask_cur(net);
|
const struct nft_hash_elem *he;
|
u32 hash;
|
|
hash = jhash(key, set->klen, priv->seed);
|
hash = reciprocal_scale(hash, priv->buckets);
|
hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
|
if (!memcmp(nft_set_ext_key(&he->ext), key, set->klen) &&
|
nft_set_elem_active(&he->ext, genmask)) {
|
*ext = &he->ext;
|
return true;
|
}
|
}
|
return false;
|
}
|
|
static void *nft_hash_get(const struct net *net, const struct nft_set *set,
|
const struct nft_set_elem *elem, unsigned int flags)
|
{
|
struct nft_hash *priv = nft_set_priv(set);
|
u8 genmask = nft_genmask_cur(net);
|
struct nft_hash_elem *he;
|
u32 hash;
|
|
hash = jhash(elem->key.val.data, set->klen, priv->seed);
|
hash = reciprocal_scale(hash, priv->buckets);
|
hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
|
if (!memcmp(nft_set_ext_key(&he->ext), elem->key.val.data, set->klen) &&
|
nft_set_elem_active(&he->ext, genmask))
|
return he;
|
}
|
return ERR_PTR(-ENOENT);
|
}
|
|
static bool nft_hash_lookup_fast(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);
|
u8 genmask = nft_genmask_cur(net);
|
const struct nft_hash_elem *he;
|
u32 hash, k1, k2;
|
|
k1 = *key;
|
hash = jhash_1word(k1, priv->seed);
|
hash = reciprocal_scale(hash, priv->buckets);
|
hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
|
k2 = *(u32 *)nft_set_ext_key(&he->ext)->data;
|
if (k1 == k2 &&
|
nft_set_elem_active(&he->ext, genmask)) {
|
*ext = &he->ext;
|
return true;
|
}
|
}
|
return false;
|
}
|
|
static u32 nft_jhash(const struct nft_set *set, const struct nft_hash *priv,
|
const struct nft_set_ext *ext)
|
{
|
const struct nft_data *key = nft_set_ext_key(ext);
|
u32 hash, k1;
|
|
if (set->klen == 4) {
|
k1 = *(u32 *)key;
|
hash = jhash_1word(k1, priv->seed);
|
} else {
|
hash = jhash(key, set->klen, priv->seed);
|
}
|
hash = reciprocal_scale(hash, priv->buckets);
|
|
return hash;
|
}
|
|
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_elem *this = elem->priv, *he;
|
struct nft_hash *priv = nft_set_priv(set);
|
u8 genmask = nft_genmask_next(net);
|
u32 hash;
|
|
hash = nft_jhash(set, priv, &this->ext);
|
hlist_for_each_entry(he, &priv->table[hash], node) {
|
if (!memcmp(nft_set_ext_key(&this->ext),
|
nft_set_ext_key(&he->ext), set->klen) &&
|
nft_set_elem_active(&he->ext, genmask)) {
|
*ext = &he->ext;
|
return -EEXIST;
|
}
|
}
|
hlist_add_head_rcu(&this->node, &priv->table[hash]);
|
return 0;
|
}
|
|
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);
|
}
|
|
static bool nft_hash_flush(const struct net *net,
|
const struct nft_set *set, void *priv)
|
{
|
struct nft_hash_elem *he = priv;
|
|
nft_set_elem_change_active(net, set, &he->ext);
|
return true;
|
}
|
|
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 *this = elem->priv, *he;
|
u8 genmask = nft_genmask_next(net);
|
u32 hash;
|
|
hash = nft_jhash(set, priv, &this->ext);
|
hlist_for_each_entry(he, &priv->table[hash], node) {
|
if (!memcmp(nft_set_ext_key(&he->ext), &elem->key.val,
|
set->klen) &&
|
nft_set_elem_active(&he->ext, genmask)) {
|
nft_set_elem_change_active(net, set, &he->ext);
|
return he;
|
}
|
}
|
return NULL;
|
}
|
|
static void nft_hash_remove(const struct net *net,
|
const struct nft_set *set,
|
const struct nft_set_elem *elem)
|
{
|
struct nft_hash_elem *he = elem->priv;
|
|
hlist_del_rcu(&he->node);
|
}
|
|
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 nft_set_elem elem;
|
int i;
|
|
for (i = 0; i < priv->buckets; i++) {
|
hlist_for_each_entry_rcu(he, &priv->table[i], node) {
|
if (iter->count < iter->skip)
|
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)
|
return;
|
cont:
|
iter->count++;
|
}
|
}
|
}
|
|
static u64 nft_hash_privsize(const struct nlattr * const nla[],
|
const struct nft_set_desc *desc)
|
{
|
return sizeof(struct nft_hash) +
|
(u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head);
|
}
|
|
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);
|
|
priv->buckets = nft_hash_buckets(desc->size);
|
get_random_bytes(&priv->seed, sizeof(priv->seed));
|
|
return 0;
|
}
|
|
static void nft_hash_destroy(const struct nft_set *set)
|
{
|
struct nft_hash *priv = nft_set_priv(set);
|
struct nft_hash_elem *he;
|
struct hlist_node *next;
|
int i;
|
|
for (i = 0; i < priv->buckets; i++) {
|
hlist_for_each_entry_safe(he, next, &priv->table[i], node) {
|
hlist_del_rcu(&he->node);
|
nft_set_elem_destroy(set, he, true);
|
}
|
}
|
}
|
|
static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features,
|
struct nft_set_estimate *est)
|
{
|
if (!desc->size)
|
return false;
|
|
if (desc->klen == 4)
|
return false;
|
|
est->size = sizeof(struct nft_hash) +
|
(u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
|
(u64)desc->size * sizeof(struct nft_hash_elem);
|
est->lookup = NFT_SET_CLASS_O_1;
|
est->space = NFT_SET_CLASS_O_N;
|
|
return true;
|
}
|
|
static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features,
|
struct nft_set_estimate *est)
|
{
|
if (!desc->size)
|
return false;
|
|
if (desc->klen != 4)
|
return false;
|
|
est->size = sizeof(struct nft_hash) +
|
(u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
|
(u64)desc->size * sizeof(struct nft_hash_elem);
|
est->lookup = NFT_SET_CLASS_O_1;
|
est->space = NFT_SET_CLASS_O_N;
|
|
return true;
|
}
|
|
const struct nft_set_type nft_set_rhash_type = {
|
.features = NFT_SET_MAP | NFT_SET_OBJECT |
|
NFT_SET_TIMEOUT | NFT_SET_EVAL,
|
.ops = {
|
.privsize = nft_rhash_privsize,
|
.elemsize = offsetof(struct nft_rhash_elem, ext),
|
.estimate = nft_rhash_estimate,
|
.init = nft_rhash_init,
|
.gc_init = nft_rhash_gc_init,
|
.destroy = nft_rhash_destroy,
|
.insert = nft_rhash_insert,
|
.activate = nft_rhash_activate,
|
.deactivate = nft_rhash_deactivate,
|
.flush = nft_rhash_flush,
|
.remove = nft_rhash_remove,
|
.lookup = nft_rhash_lookup,
|
.update = nft_rhash_update,
|
.delete = nft_rhash_delete,
|
.walk = nft_rhash_walk,
|
.get = nft_rhash_get,
|
},
|
};
|
|
const struct nft_set_type nft_set_hash_type = {
|
.features = NFT_SET_MAP | NFT_SET_OBJECT,
|
.ops = {
|
.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,
|
.walk = nft_hash_walk,
|
.get = nft_hash_get,
|
},
|
};
|
|
const struct nft_set_type nft_set_hash_fast_type = {
|
.features = NFT_SET_MAP | NFT_SET_OBJECT,
|
.ops = {
|
.privsize = nft_hash_privsize,
|
.elemsize = offsetof(struct nft_hash_elem, ext),
|
.estimate = nft_hash_fast_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_fast,
|
.walk = nft_hash_walk,
|
.get = nft_hash_get,
|
},
|
};
|
