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Message-Id: <20220321123052.70553-6-pablo@netfilter.org>
Date: Mon, 21 Mar 2022 13:30:38 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH net-next 05/19] netfilter: nft_ct: track register operations
Check if the destination register already contains the data that this ct
expression performs. This allows to skip this redundant operation. If
the destination contains a different selector, update the register
tracking information.
Export nft_expr_reduce_bitwise as a symbol since nft_ct might be
compiled as a module.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
net/netfilter/nft_bitwise.c | 1 +
net/netfilter/nft_ct.c | 47 +++++++++++++++++++++++++++++++++++++
2 files changed, 48 insertions(+)
diff --git a/net/netfilter/nft_bitwise.c b/net/netfilter/nft_bitwise.c
index dffda6612369..38caa66632b4 100644
--- a/net/netfilter/nft_bitwise.c
+++ b/net/netfilter/nft_bitwise.c
@@ -529,3 +529,4 @@ bool nft_expr_reduce_bitwise(struct nft_regs_track *track,
return false;
}
+EXPORT_SYMBOL_GPL(nft_expr_reduce_bitwise);
diff --git a/net/netfilter/nft_ct.c b/net/netfilter/nft_ct.c
index 1ec9a7e96e59..d8e1614918a1 100644
--- a/net/netfilter/nft_ct.c
+++ b/net/netfilter/nft_ct.c
@@ -26,6 +26,7 @@
struct nft_ct {
enum nft_ct_keys key:8;
enum ip_conntrack_dir dir:8;
+ u8 len;
union {
u8 dreg;
u8 sreg;
@@ -500,6 +501,7 @@ static int nft_ct_get_init(const struct nft_ctx *ctx,
}
}
+ priv->len = len;
err = nft_parse_register_store(ctx, tb[NFTA_CT_DREG], &priv->dreg, NULL,
NFT_DATA_VALUE, len);
if (err < 0)
@@ -608,6 +610,7 @@ static int nft_ct_set_init(const struct nft_ctx *ctx,
}
}
+ priv->len = len;
err = nft_parse_register_load(tb[NFTA_CT_SREG], &priv->sreg, len);
if (err < 0)
goto err1;
@@ -677,6 +680,29 @@ static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
return -1;
}
+static bool nft_ct_get_reduce(struct nft_regs_track *track,
+ const struct nft_expr *expr)
+{
+ const struct nft_ct *priv = nft_expr_priv(expr);
+ const struct nft_ct *ct;
+
+ if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
+ nft_reg_track_update(track, expr, priv->dreg, priv->len);
+ return false;
+ }
+
+ ct = nft_expr_priv(track->regs[priv->dreg].selector);
+ if (priv->key != ct->key) {
+ nft_reg_track_update(track, expr, priv->dreg, priv->len);
+ return false;
+ }
+
+ if (!track->regs[priv->dreg].bitwise)
+ return true;
+
+ return nft_expr_reduce_bitwise(track, expr);
+}
+
static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_ct *priv = nft_expr_priv(expr);
@@ -710,8 +736,27 @@ static const struct nft_expr_ops nft_ct_get_ops = {
.init = nft_ct_get_init,
.destroy = nft_ct_get_destroy,
.dump = nft_ct_get_dump,
+ .reduce = nft_ct_get_reduce,
};
+static bool nft_ct_set_reduce(struct nft_regs_track *track,
+ const struct nft_expr *expr)
+{
+ int i;
+
+ for (i = 0; i < NFT_REG32_NUM; i++) {
+ if (!track->regs[i].selector)
+ continue;
+
+ if (track->regs[i].selector->ops != &nft_ct_get_ops)
+ continue;
+
+ __nft_reg_track_cancel(track, i);
+ }
+
+ return false;
+}
+
static const struct nft_expr_ops nft_ct_set_ops = {
.type = &nft_ct_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
@@ -719,6 +764,7 @@ static const struct nft_expr_ops nft_ct_set_ops = {
.init = nft_ct_set_init,
.destroy = nft_ct_set_destroy,
.dump = nft_ct_set_dump,
+ .reduce = nft_ct_set_reduce,
};
#ifdef CONFIG_NF_CONNTRACK_ZONES
@@ -729,6 +775,7 @@ static const struct nft_expr_ops nft_ct_set_zone_ops = {
.init = nft_ct_set_init,
.destroy = nft_ct_set_destroy,
.dump = nft_ct_set_dump,
+ .reduce = nft_ct_set_reduce,
};
#endif
--
2.30.2
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