From: Florian Westphal <fw@xxxxxxxxx>
Check if we can elide the load. Cancel if the new candidate
isn't identical to previous store.
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/netfilter/nft_exthdr.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/net/netfilter/nft_exthdr.c b/net/netfilter/nft_exthdr.c
index d2b9378164bb..22c3e05b52db 100644
--- a/net/netfilter/nft_exthdr.c
+++ b/net/netfilter/nft_exthdr.c
@@ -603,12 +603,40 @@ static int nft_exthdr_dump_strip(struct sk_buff *skb, const struct nft_expr *exp
return nft_exthdr_dump_common(skb, priv);
}
+static bool nft_exthdr_reduce(struct nft_regs_track *track,
+ const struct nft_expr *expr)
+{
+ const struct nft_exthdr *priv = nft_expr_priv(expr);
+ const struct nft_exthdr *exthdr;
+
+ if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
+ nft_reg_track_update(track, expr, priv->dreg, priv->len);
+ return false;
+ }
+
+ exthdr = nft_expr_priv(track->regs[priv->dreg].selector);
+ if (priv->type != exthdr->type ||
+ priv->op != exthdr->op ||
+ priv->flags != exthdr->flags ||
+ priv->offset != exthdr->offset ||
+ priv->len != exthdr->len) {
+ 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 const struct nft_expr_ops nft_exthdr_ipv6_ops = {
.type = &nft_exthdr_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)),
.eval = nft_exthdr_ipv6_eval,
.init = nft_exthdr_init,
.dump = nft_exthdr_dump,
+ .reduce = nft_exthdr_reduce,
};
static const struct nft_expr_ops nft_exthdr_ipv4_ops = {
@@ -617,6 +645,7 @@ static const struct nft_expr_ops nft_exthdr_ipv4_ops = {
.eval = nft_exthdr_ipv4_eval,
.init = nft_exthdr_ipv4_init,
.dump = nft_exthdr_dump,
+ .reduce = nft_exthdr_reduce,
};
static const struct nft_expr_ops nft_exthdr_tcp_ops = {
@@ -625,6 +654,7 @@ static const struct nft_expr_ops nft_exthdr_tcp_ops = {
.eval = nft_exthdr_tcp_eval,
.init = nft_exthdr_init,
.dump = nft_exthdr_dump,
+ .reduce = nft_exthdr_reduce,
};
static const struct nft_expr_ops nft_exthdr_tcp_set_ops = {
@@ -633,6 +663,7 @@ static const struct nft_expr_ops nft_exthdr_tcp_set_ops = {
.eval = nft_exthdr_tcp_set_eval,
.init = nft_exthdr_tcp_set_init,
.dump = nft_exthdr_dump_set,
+ .reduce = NFT_REDUCE_READONLY,
};
static const struct nft_expr_ops nft_exthdr_tcp_strip_ops = {
@@ -641,6 +672,7 @@ static const struct nft_expr_ops nft_exthdr_tcp_strip_ops = {
.eval = nft_exthdr_tcp_strip_eval,
.init = nft_exthdr_tcp_strip_init,
.dump = nft_exthdr_dump_strip,
+ .reduce = NFT_REDUCE_READONLY,
};
static const struct nft_expr_ops nft_exthdr_sctp_ops = {
@@ -649,6 +681,7 @@ static const struct nft_expr_ops nft_exthdr_sctp_ops = {
.eval = nft_exthdr_sctp_eval,
.init = nft_exthdr_init,
.dump = nft_exthdr_dump,
+ .reduce = nft_exthdr_reduce,
};
static const struct nft_expr_ops *
--
2.30.2
