Drop nft_set_type's ability to act as a container of multiple backend
implementations it chooses from. Instead consolidate the whole selection
logic in nft_select_set_ops() and the actual backend provided estimate()
callback.
This turns nf_tables_set_types into a list containing all available
backends which is traversed when selecting one matching userspace
requested criteria.
Also, this change allows to embed nft_set_ops structure into
nft_set_type and pull flags field into the latter as it's only used
during selection phase.
A crucial part of this change is to make sure the new layout respects
hash backend constraints formerly enforced by nft_hash_select_ops()
function: This is achieved by introduction of a specific estimate()
callback for nft_hash_fast_ops which returns false for key lengths != 4.
In turn, nft_hash_estimate() is changed to return false for key lengths
== 4 so it won't be chosen by accident. Also, both callbacks must return
false for unbounded sets as their size estimate depends on a known
maximum element count.
Note that this patch partially reverts commit 4f2921ca21b71 ("netfilter:
nf_tables: meter: pick a set backend that supports updates") by making
nft_set_ops_candidate() not explicitly look for an update callback but
make NFT_SET_EVAL a regular backend feature flag which is checked along
with the others. This way all feature requirements are checked in one
go.
Signed-off-by: Phil Sutter <phil@xxxxxx>
---
include/net/netfilter/nf_tables.h | 34 ++++-----
net/netfilter/nf_tables_api.c | 25 +++----
net/netfilter/nft_set_bitmap.c | 34 ++++-----
net/netfilter/nft_set_hash.c | 153 +++++++++++++++++++++-----------------
net/netfilter/nft_set_rbtree.c | 36 ++++-----
5 files changed, 139 insertions(+), 143 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index cd368d1b8cb84..ff4723ba51f29 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -275,23 +275,6 @@ struct nft_set_estimate {
enum nft_set_class space;
};
-/**
- * struct nft_set_type - nf_tables set type
- *
- * @select_ops: function to select nft_set_ops
- * @ops: default ops, used when no select_ops functions is present
- * @list: used internally
- * @owner: module reference
- */
-struct nft_set_type {
- const struct nft_set_ops *(*select_ops)(const struct nft_ctx *,
- const struct nft_set_desc *desc,
- u32 flags);
- const struct nft_set_ops *ops;
- struct list_head list;
- struct module *owner;
-};
-
struct nft_set_ext;
struct nft_expr;
@@ -310,7 +293,6 @@ struct nft_expr;
* @init: initialize private data of new set instance
* @destroy: destroy private data of set instance
* @elemsize: element private size
- * @features: features supported by the implementation
*/
struct nft_set_ops {
bool (*lookup)(const struct net *net,
@@ -361,9 +343,23 @@ struct nft_set_ops {
void (*destroy)(const struct nft_set *set);
unsigned int elemsize;
+};
+
+/**
+ * struct nft_set_type - nf_tables set type
+ *
+ * @ops: set ops for this type
+ * @list: used internally
+ * @owner: module reference
+ * @features: features supported by the implementation
+ */
+struct nft_set_type {
+ const struct nft_set_ops ops;
+ struct list_head list;
+ struct module *owner;
u32 features;
- const struct nft_set_type *type;
};
+#define to_set_type(o) container_of(o, struct nft_set_type, ops)
int nft_register_set(struct nft_set_type *type);
void nft_unregister_set(struct nft_set_type *type);
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 9134cc429ad48..c90e7bf8d63c9 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2505,14 +2505,12 @@ void nft_unregister_set(struct nft_set_type *type)
EXPORT_SYMBOL_GPL(nft_unregister_set);
#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
- NFT_SET_TIMEOUT | NFT_SET_OBJECT)
+ NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
+ NFT_SET_EVAL)
-static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags)
+static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
{
- if ((flags & NFT_SET_EVAL) && !ops->update)
- return false;
-
- return (flags & ops->features) == (flags & NFT_SET_FEATURES);
+ return (flags & type->features) == (flags & NFT_SET_FEATURES);
}
/*
@@ -2549,14 +2547,9 @@ nft_select_set_ops(const struct nft_ctx *ctx,
best.space = ~0;
list_for_each_entry(type, &nf_tables_set_types, list) {
- if (!type->select_ops)
- ops = type->ops;
- else
- ops = type->select_ops(ctx, desc, flags);
- if (!ops)
- continue;
+ ops = &type->ops;
- if (!nft_set_ops_candidate(ops, flags))
+ if (!nft_set_ops_candidate(type, flags))
continue;
if (!ops->estimate(desc, flags, &est))
continue;
@@ -2587,7 +2580,7 @@ nft_select_set_ops(const struct nft_ctx *ctx,
if (!try_module_get(type->owner))
continue;
if (bops != NULL)
- module_put(bops->type->owner);
+ module_put(to_set_type(bops)->owner);
bops = ops;
best = est;
@@ -3222,14 +3215,14 @@ static int nf_tables_newset(struct net *net, struct sock *nlsk,
err2:
kvfree(set);
err1:
- module_put(ops->type->owner);
+ module_put(to_set_type(ops)->owner);
return err;
}
static void nft_set_destroy(struct nft_set *set)
{
set->ops->destroy(set);
- module_put(set->ops->type->owner);
+ module_put(to_set_type(set->ops)->owner);
kfree(set->name);
kvfree(set);
}
diff --git a/net/netfilter/nft_set_bitmap.c b/net/netfilter/nft_set_bitmap.c
index 45fb2752fb637..d6626e01c7ee6 100644
--- a/net/netfilter/nft_set_bitmap.c
+++ b/net/netfilter/nft_set_bitmap.c
@@ -296,27 +296,23 @@ static bool nft_bitmap_estimate(const struct nft_set_desc *desc, u32 features,
return true;
}
-static struct nft_set_type nft_bitmap_type;
-static struct nft_set_ops nft_bitmap_ops __read_mostly = {
- .type = &nft_bitmap_type,
- .privsize = nft_bitmap_privsize,
- .elemsize = offsetof(struct nft_bitmap_elem, ext),
- .estimate = nft_bitmap_estimate,
- .init = nft_bitmap_init,
- .destroy = nft_bitmap_destroy,
- .insert = nft_bitmap_insert,
- .remove = nft_bitmap_remove,
- .deactivate = nft_bitmap_deactivate,
- .flush = nft_bitmap_flush,
- .activate = nft_bitmap_activate,
- .lookup = nft_bitmap_lookup,
- .walk = nft_bitmap_walk,
- .get = nft_bitmap_get,
-};
-
static struct nft_set_type nft_bitmap_type __read_mostly = {
- .ops = &nft_bitmap_ops,
.owner = THIS_MODULE,
+ .ops = {
+ .privsize = nft_bitmap_privsize,
+ .elemsize = offsetof(struct nft_bitmap_elem, ext),
+ .estimate = nft_bitmap_estimate,
+ .init = nft_bitmap_init,
+ .destroy = nft_bitmap_destroy,
+ .insert = nft_bitmap_insert,
+ .remove = nft_bitmap_remove,
+ .deactivate = nft_bitmap_deactivate,
+ .flush = nft_bitmap_flush,
+ .activate = nft_bitmap_activate,
+ .lookup = nft_bitmap_lookup,
+ .walk = nft_bitmap_walk,
+ .get = nft_bitmap_get,
+ },
};
static int __init nft_bitmap_module_init(void)
diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c
index fc9c6d5d64cd7..dbf1f4ad077c5 100644
--- a/net/netfilter/nft_set_hash.c
+++ b/net/netfilter/nft_set_hash.c
@@ -605,6 +605,12 @@ static void nft_hash_destroy(const struct nft_set *set)
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) +
nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
desc->size * sizeof(struct nft_hash_elem);
@@ -614,91 +620,100 @@ static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features,
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,
- .get = nft_rhash_get,
- .features = NFT_SET_MAP | NFT_SET_OBJECT | NFT_SET_TIMEOUT,
-};
+static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features,
+ struct nft_set_estimate *est)
+{
+ if (!desc->size)
+ return false;
-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,
- .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,
- .features = NFT_SET_MAP | NFT_SET_OBJECT,
-};
+ if (desc->klen != 4)
+ return false;
-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,
- .get = nft_hash_get,
- .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 && !(flags & (NFT_SET_EVAL | NFT_SET_TIMEOUT))) {
- switch (desc->klen) {
- case 4:
- return &nft_hash_fast_ops;
- default:
- return &nft_hash_ops;
- }
- }
+ 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 &nft_rhash_ops;
+ return true;
}
+static struct nft_set_type nft_rhash_type __read_mostly = {
+ .owner = THIS_MODULE,
+ .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,
+ .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,
+ .get = nft_rhash_get,
+ },
+};
+
static struct nft_set_type nft_hash_type __read_mostly = {
- .select_ops = nft_hash_select_ops,
.owner = THIS_MODULE,
+ .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,
+ },
+};
+
+static struct nft_set_type nft_hash_fast_type __read_mostly = {
+ .owner = THIS_MODULE,
+ .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,
+ },
};
static int __init nft_hash_module_init(void)
{
- return nft_register_set(&nft_hash_type);
+ if (nft_register_set(&nft_hash_fast_type) ||
+ nft_register_set(&nft_hash_type) ||
+ nft_register_set(&nft_rhash_type))
+ return 1;
+ return 0;
}
static void __exit nft_hash_module_exit(void)
{
+ nft_unregister_set(&nft_rhash_type);
nft_unregister_set(&nft_hash_type);
+ nft_unregister_set(&nft_hash_fast_type);
}
module_init(nft_hash_module_init);
diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c
index e6f08bc5f359b..22c57d7612c47 100644
--- a/net/netfilter/nft_set_rbtree.c
+++ b/net/netfilter/nft_set_rbtree.c
@@ -393,28 +393,24 @@ static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features,
return true;
}
-static struct nft_set_type nft_rbtree_type;
-static struct nft_set_ops nft_rbtree_ops __read_mostly = {
- .type = &nft_rbtree_type,
- .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,
- .features = NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_OBJECT,
-};
-
static struct nft_set_type nft_rbtree_type __read_mostly = {
- .ops = &nft_rbtree_ops,
.owner = THIS_MODULE,
+ .features = NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_OBJECT,
+ .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,
+ },
};
static int __init nft_rbtree_module_init(void)
--
2.16.1
--
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