diff options
author | Pablo Neira Ayuso <pablo@netfilter.org> | 2022-01-09 19:11:23 +0300 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2022-01-10 01:35:17 +0300 |
commit | 9b17afb2c88bbadcc15b96f0275c426ae3d89a33 (patch) | |
tree | 1be7be5fb261e2eed2dc1058bdea1c7ce0f3ddf2 /net/netfilter/nft_meta.c | |
parent | a7c176bf9f0e916f7544f6a00d898b0c90de1887 (diff) | |
download | linux-9b17afb2c88bbadcc15b96f0275c426ae3d89a33.tar.xz |
netfilter: nft_meta: track register operations
Check if the destination register already contains the data that this
meta store expression performs. This allows to skip this redundant
operation. If the destination contains a different selector, update
the register tracking information.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_meta.c')
-rw-r--r-- | net/netfilter/nft_meta.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c index fe91ff5f8fbe..430f40bc3cb4 100644 --- a/net/netfilter/nft_meta.c +++ b/net/netfilter/nft_meta.c @@ -750,12 +750,40 @@ 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 false; +} + 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, }; |