#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
+#define NFT_RHASH_ELEMENT_HINT 3
-struct nft_hash {
+struct nft_rhash {
struct rhashtable ht;
struct delayed_work gc_work;
};
-struct nft_hash_elem {
+struct nft_rhash_elem {
struct rhash_head node;
struct nft_set_ext ext;
};
-struct nft_hash_cmp_arg {
+struct nft_rhash_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)
+static inline u32 nft_rhash_key(const void *data, u32 len, u32 seed)
{
- const struct nft_hash_cmp_arg *arg = data;
+ const struct nft_rhash_cmp_arg *arg = data;
return jhash(arg->key, len, seed);
}
-static inline u32 nft_hash_obj(const void *data, u32 len, u32 seed)
+static inline u32 nft_rhash_obj(const void *data, u32 len, u32 seed)
{
- const struct nft_hash_elem *he = data;
+ const struct nft_rhash_elem *he = data;
return jhash(nft_set_ext_key(&he->ext), len, seed);
}
-static inline int nft_hash_cmp(struct rhashtable_compare_arg *arg,
- const void *ptr)
+static inline int nft_rhash_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;
+ const struct nft_rhash_cmp_arg *x = arg->key;
+ const struct nft_rhash_elem *he = ptr;
if (memcmp(nft_set_ext_key(&he->ext), x->key, x->set->klen))
return 1;
return 0;
}
-static bool nft_hash_lookup(const struct net *net, const struct nft_set *set,
- const u32 *key, const struct nft_set_ext **ext)
+static const struct rhashtable_params nft_rhash_params = {
+ .head_offset = offsetof(struct nft_rhash_elem, node),
+ .hashfn = nft_rhash_key,
+ .obj_hashfn = nft_rhash_obj,
+ .obj_cmpfn = nft_rhash_cmp,
+ .automatic_shrinking = true,
+};
+
+static bool nft_rhash_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 = {
+ struct nft_rhash *priv = nft_set_priv(set);
+ const struct nft_rhash_elem *he;
+ struct nft_rhash_cmp_arg arg = {
.genmask = nft_genmask_cur(net),
.set = set,
.key = key,
};
- he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params);
+ he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
if (he != NULL)
*ext = &he->ext;
return !!he;
}
-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)
+static bool nft_rhash_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 = {
+ struct nft_rhash *priv = nft_set_priv(set);
+ struct nft_rhash_elem *he, *prev;
+ struct nft_rhash_cmp_arg arg = {
.genmask = NFT_GENMASK_ANY,
.set = set,
.key = key,
};
- he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params);
+ he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
if (he != NULL)
goto out;
goto err1;
prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
- nft_hash_params);
+ nft_rhash_params);
if (IS_ERR(prev))
goto err2;
return false;
}
-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)
+static int nft_rhash_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 = {
+ struct nft_rhash *priv = nft_set_priv(set);
+ struct nft_rhash_elem *he = elem->priv;
+ struct nft_rhash_cmp_arg arg = {
.genmask = nft_genmask_next(net),
.set = set,
.key = elem->key.val.data,
};
- struct nft_hash_elem *prev;
+ struct nft_rhash_elem *prev;
prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
- nft_hash_params);
+ nft_rhash_params);
if (IS_ERR(prev))
return PTR_ERR(prev);
if (prev) {
return 0;
}
-static void nft_hash_activate(const struct net *net, const struct nft_set *set,
- const struct nft_set_elem *elem)
+static void nft_rhash_activate(const struct net *net, const struct nft_set *set,
+ const struct nft_set_elem *elem)
{
- struct nft_hash_elem *he = elem->priv;
+ struct nft_rhash_elem *he = elem->priv;
nft_set_elem_change_active(net, set, &he->ext);
nft_set_elem_clear_busy(&he->ext);
}
-static bool nft_hash_flush(const struct net *net,
- const struct nft_set *set, void *priv)
+static bool nft_rhash_flush(const struct net *net,
+ const struct nft_set *set, void *priv)
{
- struct nft_hash_elem *he = priv;
+ struct nft_rhash_elem *he = priv;
if (!nft_set_elem_mark_busy(&he->ext) ||
!nft_is_active(net, &he->ext)) {
return false;
}
-static void *nft_hash_deactivate(const struct net *net,
- const struct nft_set *set,
- const struct nft_set_elem *elem)
+static void *nft_rhash_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 = {
+ struct nft_rhash *priv = nft_set_priv(set);
+ struct nft_rhash_elem *he;
+ struct nft_rhash_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);
+ he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
if (he != NULL &&
- !nft_hash_flush(net, set, he))
+ !nft_rhash_flush(net, set, he))
he = NULL;
rcu_read_unlock();
return he;
}
-static void nft_hash_remove(const struct net *net,
- const struct nft_set *set,
- const struct nft_set_elem *elem)
+static void nft_rhash_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;
+ struct nft_rhash *priv = nft_set_priv(set);
+ struct nft_rhash_elem *he = elem->priv;
- rhashtable_remove_fast(&priv->ht, &he->node, nft_hash_params);
+ rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params);
}
-static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set,
- struct nft_set_iter *iter)
+static void nft_rhash_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_rhash *priv = nft_set_priv(set);
+ struct nft_rhash_elem *he;
struct rhashtable_iter hti;
struct nft_set_elem elem;
int err;
rhashtable_walk_exit(&hti);
}
-static void nft_hash_gc(struct work_struct *work)
+static void nft_rhash_gc(struct work_struct *work)
{
struct nft_set *set;
- struct nft_hash_elem *he;
- struct nft_hash *priv;
+ struct nft_rhash_elem *he;
+ struct nft_rhash *priv;
struct nft_set_gc_batch *gcb = NULL;
struct rhashtable_iter hti;
int err;
- priv = container_of(work, struct nft_hash, gc_work.work);
+ priv = container_of(work, struct nft_rhash, gc_work.work);
set = nft_set_container_of(priv);
err = rhashtable_walk_init(&priv->ht, &hti, GFP_KERNEL);
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);
+ rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params);
atomic_dec(&set->nelems);
nft_set_gc_batch_add(gcb, he);
}
nft_set_gc_interval(set));
}
-static unsigned int nft_hash_privsize(const struct nlattr * const nla[])
+static unsigned int nft_rhash_privsize(const struct nlattr * const nla[],
+ const struct nft_set_desc *desc)
{
- return sizeof(struct nft_hash);
+ return sizeof(struct nft_rhash);
}
-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[])
+static int nft_rhash_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;
+ struct nft_rhash *priv = nft_set_priv(set);
+ struct rhashtable_params params = nft_rhash_params;
int err;
- params.nelem_hint = desc->size ?: NFT_HASH_ELEMENT_HINT;
+ params.nelem_hint = desc->size ?: NFT_RHASH_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);
+ INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc);
if (set->flags & NFT_SET_TIMEOUT)
queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
nft_set_gc_interval(set));
return 0;
}
-static void nft_hash_elem_destroy(void *ptr, void *arg)
+static void nft_rhash_elem_destroy(void *ptr, void *arg)
{
nft_set_elem_destroy(arg, ptr, true);
}
-static void nft_hash_destroy(const struct nft_set *set)
+static void nft_rhash_destroy(const struct nft_set *set)
{
- struct nft_hash *priv = nft_set_priv(set);
+ struct nft_rhash *priv = nft_set_priv(set);
cancel_delayed_work_sync(&priv->gc_work);
- rhashtable_free_and_destroy(&priv->ht, nft_hash_elem_destroy,
+ rhashtable_free_and_destroy(&priv->ht, nft_rhash_elem_destroy,
(void *)set);
}
-static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features,
- struct nft_set_estimate *est)
+static u32 nft_hash_buckets(u32 size)
{
- unsigned int esize;
+ return roundup_pow_of_two(size * 4 / 3);
+}
- 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 *);
+static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features,
+ struct nft_set_estimate *est)
+{
+ est->size = ~0;
+ est->lookup = NFT_SET_CLASS_O_1;
+ est->space = NFT_SET_CLASS_O_N;
+
+ return true;
+}
+
+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;
+}
+
+/* nft_hash_select_ops() makes sure key size can be either 2 or 4 bytes . */
+static inline u32 nft_hash_key(const u32 *key, u32 klen)
+{
+ if (klen == 4)
+ return *key;
+
+ return *(u16 *)key;
+}
+
+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 = nft_hash_key(key, set->klen);
+ hash = jhash_1word(k1, priv->seed);
+ hash = reciprocal_scale(hash, priv->buckets);
+ hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
+ k2 = nft_hash_key(nft_set_ext_key(&he->ext)->data, set->klen);
+ if (k1 == k2 &&
+ nft_set_elem_active(&he->ext, genmask)) {
+ *ext = &he->ext;
+ return true;
+ }
+ }
+ return false;
+}
+
+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 = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed);
+ hash = reciprocal_scale(hash, priv->buckets);
+ 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 = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed);
+ hash = reciprocal_scale(hash, priv->buckets);
+ hlist_for_each_entry(he, &priv->table[hash], node) {
+ if (!memcmp(nft_set_ext_key(&this->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 unsigned int nft_hash_privsize(const struct nlattr * const nla[],
+ const struct nft_set_desc *desc)
+{
+ return sizeof(struct nft_hash) +
+ 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)
+{
+ est->size = sizeof(struct nft_hash) +
+ nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
+ desc->size * sizeof(struct nft_hash_elem);
est->lookup = NFT_SET_CLASS_O_1;
est->space = NFT_SET_CLASS_O_N;
return true;
}
+static struct nft_set_type nft_hash_type;
+static struct nft_set_ops nft_rhash_ops __read_mostly = {
+ .type = &nft_hash_type,
+ .privsize = nft_rhash_privsize,
+ .elemsize = offsetof(struct nft_rhash_elem, ext),
+ .estimate = nft_rhash_estimate,
+ .init = nft_rhash_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,
+ .walk = nft_rhash_walk,
+ .features = NFT_SET_MAP | NFT_SET_OBJECT | NFT_SET_TIMEOUT,
+};
+
static struct nft_set_ops nft_hash_ops __read_mostly = {
+ .type = &nft_hash_type,
.privsize = nft_hash_privsize,
.elemsize = offsetof(struct nft_hash_elem, ext),
.estimate = nft_hash_estimate,
.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,
+ .features = NFT_SET_MAP | NFT_SET_OBJECT,
+};
+
+static struct nft_set_ops nft_hash_fast_ops __read_mostly = {
+ .type = &nft_hash_type,
+ .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_fast,
+ .walk = nft_hash_walk,
+ .features = NFT_SET_MAP | NFT_SET_OBJECT,
+};
+
+static const struct nft_set_ops *
+nft_hash_select_ops(const struct nft_ctx *ctx, const struct nft_set_desc *desc,
+ u32 flags)
+{
+ if (desc->size) {
+ switch (desc->klen) {
+ case 2:
+ case 4:
+ return &nft_hash_fast_ops;
+ default:
+ return &nft_hash_ops;
+ }
+ }
+
+ return &nft_rhash_ops;
+}
+
+static struct nft_set_type nft_hash_type __read_mostly = {
+ .select_ops = nft_hash_select_ops,
.owner = THIS_MODULE,
};
static int __init nft_hash_module_init(void)
{
- return nft_register_set(&nft_hash_ops);
+ return nft_register_set(&nft_hash_type);
}
static void __exit nft_hash_module_exit(void)
{
- nft_unregister_set(&nft_hash_ops);
+ nft_unregister_set(&nft_hash_type);
}
module_init(nft_hash_module_init);
projects / karo-tx-linux.git / blobdiff