From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1BBC7C433EF for ; Sat, 12 Mar 2022 15:48:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232090AbiCLPt2 (ORCPT ); Sat, 12 Mar 2022 10:49:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232097AbiCLPt0 (ORCPT ); Sat, 12 Mar 2022 10:49:26 -0500 Received: from mail.netfilter.org (mail.netfilter.org [217.70.188.207]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id A4F368BE23 for ; Sat, 12 Mar 2022 07:48:20 -0800 (PST) Received: from localhost.localdomain (unknown [78.30.32.163]) by mail.netfilter.org (Postfix) with ESMTPSA id 08198625FB for ; Sat, 12 Mar 2022 16:46:10 +0100 (CET) From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Subject: [PATCH nf-next 4/9] netfilter: nft_lookup: only cancel tracking for clobbered dregs Date: Sat, 12 Mar 2022 16:48:06 +0100 Message-Id: <20220312154811.68611-5-pablo@netfilter.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220312154811.68611-1-pablo@netfilter.org> References: <20220312154811.68611-1-pablo@netfilter.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org From: Florian Westphal In most cases, nft_lookup will be read-only, i.e. won't clobber registers. In case of map, we need to cancel the registers that will see stores. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nft_lookup.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/net/netfilter/nft_lookup.c b/net/netfilter/nft_lookup.c index 90becbf5bff3..dfae12759c7c 100644 --- a/net/netfilter/nft_lookup.c +++ b/net/netfilter/nft_lookup.c @@ -253,6 +253,17 @@ static int nft_lookup_validate(const struct nft_ctx *ctx, return 0; } +static bool nft_lookup_reduce(struct nft_regs_track *track, + const struct nft_expr *expr) +{ + const struct nft_lookup *priv = nft_expr_priv(expr); + + if (priv->set->flags & NFT_SET_MAP) + nft_reg_track_cancel(track, priv->dreg, priv->set->dlen); + + return false; +} + static const struct nft_expr_ops nft_lookup_ops = { .type = &nft_lookup_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)), @@ -263,6 +274,7 @@ static const struct nft_expr_ops nft_lookup_ops = { .destroy = nft_lookup_destroy, .dump = nft_lookup_dump, .validate = nft_lookup_validate, + .reduce = nft_lookup_reduce, }; struct nft_expr_type nft_lookup_type __read_mostly = { -- 2.30.2