1 files changed, 48 insertions, 0 deletions

diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index fe91ff5f8fbe..5ab4df56c945 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -750,16 +750,63 @@ static int nft_meta_get_offload(struct nft_offload_ctx *ctx,
 	return 0;
 }
 
+static bool nft_meta_get_reduce(struct nft_regs_track *track,
+				const struct nft_expr *expr)
+{
+	const struct nft_meta *priv = nft_expr_priv(expr);
+	const struct nft_meta *meta;
+
+	if (!track->regs[priv->dreg].selector ||
+	    track->regs[priv->dreg].selector->ops != expr->ops) {
+		track->regs[priv->dreg].selector = expr;
+		track->regs[priv->dreg].bitwise = NULL;
+		return false;
+	}
+
+	meta = nft_expr_priv(track->regs[priv->dreg].selector);
+	if (priv->key != meta->key ||
+	    priv->dreg != meta->dreg) {
+		track->regs[priv->dreg].selector = expr;
+		track->regs[priv->dreg].bitwise = NULL;
+		return false;
+	}
+
+	if (!track->regs[priv->dreg].bitwise)
+		return true;
+
+	return nft_expr_reduce_bitwise(track, expr);
+}
+
 static const struct nft_expr_ops nft_meta_get_ops = {
 	.type		= &nft_meta_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
 	.eval		= nft_meta_get_eval,
 	.init		= nft_meta_get_init,
 	.dump		= nft_meta_get_dump,
+	.reduce		= nft_meta_get_reduce,
 	.validate	= nft_meta_get_validate,
 	.offload	= nft_meta_get_offload,
 };
 
+static bool nft_meta_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_meta_get_ops)
+			continue;
+
+		track->regs[i].selector = NULL;
+		track->regs[i].bitwise = NULL;
+	}
+
+	return false;
+}
+
 static const struct nft_expr_ops nft_meta_set_ops = {
 	.type		= &nft_meta_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
@@ -767,6 +814,7 @@ static const struct nft_expr_ops nft_meta_set_ops = {
 	.init		= nft_meta_set_init,
 	.destroy	= nft_meta_set_destroy,
 	.dump		= nft_meta_set_dump,
+	.reduce		= nft_meta_set_reduce,
 	.validate	= nft_meta_set_validate,
 };