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authorPablo Neira Ayuso <pablo@netfilter.org>2022-01-09 17:11:18 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2022-01-09 23:35:17 +0100
commit3b9e2ea6c11bff72ac1d607f6b954e7666b47409 (patch)
tree7b39eb1807aff03aee6b92efe215111cb673dba0 /net/netfilter/nft_limit.c
parent369b6cb5d391750fc01ce951c2500281d2975705 (diff)
netfilter: nft_limit: move stateful fields out of expression data
In preparation for the rule blob representation. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_limit.c')
-rw-r--r--net/netfilter/nft_limit.c94
1 files changed, 82 insertions, 12 deletions
diff --git a/net/netfilter/nft_limit.c b/net/netfilter/nft_limit.c
index d6e0226b7603..f04be5be73a0 100644
--- a/net/netfilter/nft_limit.c
+++ b/net/netfilter/nft_limit.c
@@ -14,10 +14,14 @@
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
-struct nft_limit_priv {
+struct nft_limit {
spinlock_t lock;
u64 last;
u64 tokens;
+};
+
+struct nft_limit_priv {
+ struct nft_limit *limit;
u64 tokens_max;
u64 rate;
u64 nsecs;
@@ -30,21 +34,21 @@ static inline bool nft_limit_eval(struct nft_limit_priv *priv, u64 cost)
u64 now, tokens;
s64 delta;
- spin_lock_bh(&priv->lock);
+ spin_lock_bh(&priv->limit->lock);
now = ktime_get_ns();
- tokens = priv->tokens + now - priv->last;
+ tokens = priv->limit->tokens + now - priv->limit->last;
if (tokens > priv->tokens_max)
tokens = priv->tokens_max;
- priv->last = now;
+ priv->limit->last = now;
delta = tokens - cost;
if (delta >= 0) {
- priv->tokens = delta;
- spin_unlock_bh(&priv->lock);
+ priv->limit->tokens = delta;
+ spin_unlock_bh(&priv->limit->lock);
return priv->invert;
}
- priv->tokens = tokens;
- spin_unlock_bh(&priv->lock);
+ priv->limit->tokens = tokens;
+ spin_unlock_bh(&priv->limit->lock);
return !priv->invert;
}
@@ -86,8 +90,12 @@ static int nft_limit_init(struct nft_limit_priv *priv,
priv->rate);
}
- priv->tokens = tokens;
- priv->tokens_max = priv->tokens;
+ priv->limit = kmalloc(sizeof(*priv->limit), GFP_KERNEL);
+ if (!priv->limit)
+ return -ENOMEM;
+
+ priv->limit->tokens = tokens;
+ priv->tokens_max = priv->limit->tokens;
if (tb[NFTA_LIMIT_FLAGS]) {
u32 flags = ntohl(nla_get_be32(tb[NFTA_LIMIT_FLAGS]));
@@ -95,8 +103,8 @@ static int nft_limit_init(struct nft_limit_priv *priv,
if (flags & NFT_LIMIT_F_INV)
priv->invert = true;
}
- priv->last = ktime_get_ns();
- spin_lock_init(&priv->lock);
+ priv->limit->last = ktime_get_ns();
+ spin_lock_init(&priv->limit->lock);
return 0;
}
@@ -121,6 +129,32 @@ nla_put_failure:
return -1;
}
+static void nft_limit_destroy(const struct nft_ctx *ctx,
+ const struct nft_limit_priv *priv)
+{
+ kfree(priv->limit);
+}
+
+static int nft_limit_clone(struct nft_limit_priv *priv_dst,
+ const struct nft_limit_priv *priv_src)
+{
+ priv_dst->tokens_max = priv_src->tokens_max;
+ priv_dst->rate = priv_src->rate;
+ priv_dst->nsecs = priv_src->nsecs;
+ priv_dst->burst = priv_src->burst;
+ priv_dst->invert = priv_src->invert;
+
+ priv_dst->limit = kmalloc(sizeof(*priv_dst->limit), GFP_ATOMIC);
+ if (priv_dst->limit)
+ return -ENOMEM;
+
+ spin_lock_init(&priv_dst->limit->lock);
+ priv_dst->limit->tokens = priv_src->tokens_max;
+ priv_dst->limit->last = ktime_get_ns();
+
+ return 0;
+}
+
struct nft_limit_priv_pkts {
struct nft_limit_priv limit;
u64 cost;
@@ -166,12 +200,30 @@ static int nft_limit_pkts_dump(struct sk_buff *skb, const struct nft_expr *expr)
return nft_limit_dump(skb, &priv->limit, NFT_LIMIT_PKTS);
}
+static void nft_limit_pkts_destroy(const struct nft_ctx *ctx,
+ const struct nft_expr *expr)
+{
+ const struct nft_limit_priv_pkts *priv = nft_expr_priv(expr);
+
+ nft_limit_destroy(ctx, &priv->limit);
+}
+
+static int nft_limit_pkts_clone(struct nft_expr *dst, const struct nft_expr *src)
+{
+ struct nft_limit_priv_pkts *priv_dst = nft_expr_priv(dst);
+ struct nft_limit_priv_pkts *priv_src = nft_expr_priv(src);
+
+ return nft_limit_clone(&priv_dst->limit, &priv_src->limit);
+}
+
static struct nft_expr_type nft_limit_type;
static const struct nft_expr_ops nft_limit_pkts_ops = {
.type = &nft_limit_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_limit_priv_pkts)),
.eval = nft_limit_pkts_eval,
.init = nft_limit_pkts_init,
+ .destroy = nft_limit_pkts_destroy,
+ .clone = nft_limit_pkts_clone,
.dump = nft_limit_pkts_dump,
};
@@ -203,12 +255,30 @@ static int nft_limit_bytes_dump(struct sk_buff *skb,
return nft_limit_dump(skb, priv, NFT_LIMIT_PKT_BYTES);
}
+static void nft_limit_bytes_destroy(const struct nft_ctx *ctx,
+ const struct nft_expr *expr)
+{
+ const struct nft_limit_priv *priv = nft_expr_priv(expr);
+
+ nft_limit_destroy(ctx, priv);
+}
+
+static int nft_limit_bytes_clone(struct nft_expr *dst, const struct nft_expr *src)
+{
+ struct nft_limit_priv *priv_dst = nft_expr_priv(dst);
+ struct nft_limit_priv *priv_src = nft_expr_priv(src);
+
+ return nft_limit_clone(priv_dst, priv_src);
+}
+
static const struct nft_expr_ops nft_limit_bytes_ops = {
.type = &nft_limit_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_limit_priv)),
.eval = nft_limit_bytes_eval,
.init = nft_limit_bytes_init,
.dump = nft_limit_bytes_dump,
+ .clone = nft_limit_bytes_clone,
+ .destroy = nft_limit_bytes_destroy,
};
static const struct nft_expr_ops *