Check if the destination register already contains the data that this
tunnel expression performs. This allows to skip this redundant operation.
If the destination contains a different selector, update the register
tracking information. This patch does not perform bitwise tracking.
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
v2: new in this series
net/netfilter/nft_tunnel.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/net/netfilter/nft_tunnel.c b/net/netfilter/nft_tunnel.c
index 3b27926d5382..d0f9b1d51b0e 100644
--- a/net/netfilter/nft_tunnel.c
+++ b/net/netfilter/nft_tunnel.c
@@ -17,6 +17,7 @@ struct nft_tunnel {
enum nft_tunnel_keys key:8;
u8 dreg;
enum nft_tunnel_mode mode:8;
+ u8 len;
};
static void nft_tunnel_get_eval(const struct nft_expr *expr,
@@ -101,6 +102,7 @@ static int nft_tunnel_get_init(const struct nft_ctx *ctx,
priv->mode = NFT_TUNNEL_MODE_NONE;
}
+ priv->len = len;
return nft_parse_register_store(ctx, tb[NFTA_TUNNEL_DREG], &priv->dreg,
NULL, NFT_DATA_VALUE, len);
}
@@ -122,6 +124,31 @@ static int nft_tunnel_get_dump(struct sk_buff *skb,
return -1;
}
+static bool nft_tunnel_get_reduce(struct nft_regs_track *track,
+ const struct nft_expr *expr)
+{
+ const struct nft_tunnel *priv = nft_expr_priv(expr);
+ const struct nft_tunnel *tunnel;
+
+ if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
+ nft_reg_track_update(track, expr, priv->dreg, priv->len);
+ return false;
+ }
+
+ tunnel = nft_expr_priv(track->regs[priv->dreg].selector);
+ if (priv->key != tunnel->key ||
+ priv->dreg != tunnel->dreg ||
+ priv->mode != tunnel->mode) {
+ nft_reg_track_update(track, expr, priv->dreg, priv->len);
+ return false;
+ }
+
+ if (!track->regs[priv->dreg].bitwise)
+ return true;
+
+ return false;
+}
+
static struct nft_expr_type nft_tunnel_type;
static const struct nft_expr_ops nft_tunnel_get_ops = {
.type = &nft_tunnel_type,
@@ -129,6 +156,7 @@ static const struct nft_expr_ops nft_tunnel_get_ops = {
.eval = nft_tunnel_get_eval,
.init = nft_tunnel_get_init,
.dump = nft_tunnel_get_dump,
+ .reduce = nft_tunnel_get_reduce,
};
static struct nft_expr_type nft_tunnel_type __read_mostly = {
--
2.30.2
