From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.netfilter.org (mail.netfilter.org [217.70.190.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 261CE2918DC; Thu, 24 Apr 2025 21:15:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.190.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745529327; cv=none; b=XCOInMy0h5WEQ0Zd7+mW+3I4mpbJSxU5cJaWiy/c41gIVvkEdXYCiWkK5qSnZjp0k7McuD6mvXqc1S0HwG2dNRmxKrqA+UL3Y8iwA6CDKu9FeO7TAFrhNLD9Qegm09iDJW9D6iQ9BJs8TPPUPkOuhFeiad38hYeg28gUxDOizHI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745529327; c=relaxed/simple; bh=xjQUqdHomWBGV+L9OFBYKbZJrG26ub27QJgU0MZfnfo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=lD4XzBaPubU3jY56jAWNHfwaVMt5yyf2jipzEPvwtZ/A3rWJkSNQFNofPXiARgtO/SVeJXEILa4h14rO8NvzSUOdCO5dsB+LdYHY1/CQPMkG2ldgUpMwtj4EoSOoGn5wzpzSQ2UEDE2r9nykP40XzZ8cg1Rp2HT/RqeHdXaNwPY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=netfilter.org; spf=pass smtp.mailfrom=netfilter.org; dkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org header.b=PHfitAbG; dkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org header.b=JWa95ESd; arc=none smtp.client-ip=217.70.190.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=netfilter.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=netfilter.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org header.b="PHfitAbG"; dkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org header.b="JWa95ESd" Received: by mail.netfilter.org (Postfix, from userid 109) id 876056071D; Thu, 24 Apr 2025 23:15:24 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=netfilter.org; s=2025; t=1745529324; bh=Kx0D9pn3i6pERyxfuCLZBf3n2d0K6uejemARtibfXZ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PHfitAbGIH7ELemg0+ilYGUgFv1C2wmHgFUT3HXTki3X+KClSd8GWGAoAwFWTNkR7 9u1nDLVi3WvDXpkKoUoyzPUdPMepMExLcr5lx4ERPtUoX92B15s68/zKr+HfAYWwKX WkC7xGCuEyQ/LJhtZp2MRCt0bb1AbaLe/C5vpmRSM4gzgqVswWcCaom9v7sxhu8K9u Qbyolvx5183/TR4ufD9BApPSO36fFffm8l2LA+Ig+F4MGcUm3ASkvyHFyYZdTbyACl DlCwzJvRDPys+Jz7tiDkL0wfByqJylZW9ERL3QIYRxLXscxo9rQLLqtpWew7F6KaM4 +4gUmBowfh5Jw== X-Spam-Level: Received: from localhost.localdomain (mail-agni [217.70.190.124]) by mail.netfilter.org (Postfix) with ESMTPSA id BA06B60724; Thu, 24 Apr 2025 23:15:15 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=netfilter.org; s=2025; t=1745529316; bh=Kx0D9pn3i6pERyxfuCLZBf3n2d0K6uejemARtibfXZ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JWa95ESdsf95uGduKd0R6/j5FoeiFb7L++MmuXmhNC1bkcY56BI5cTUYc/HSU5GEl MwTBVpeDuD4LXcyfzEbAJ7cUa1YF55A0G842cNBnvpZc2H0vBZFYh+Y9WIyxUYy2k2 bcJ+IRS17W3XKDEq0FBqzJcEKoSLksQFfNSazVAOaGAUB4n+Nn5jgLR0WpEafgjVAv M2o+e8w1nYOuJQI6lYBPYNp0Ow2bkNvHUMHSvd4sbWF53vaGZ/dgPt3TeKoKESQBAQ NPO5bLJDYZIGnN+n4z3XEgF5dMVdCuDiMqrfUkQ4wVLlHt6KTaSrFQy8QRQMghNWS3 OBqPv+dAT1upQ== From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com, fw@strlen.de, horms@kernel.org Subject: [PATCH net-next 7/7] netfilter: nf_tables: export set count and backend name to userspace Date: Thu, 24 Apr 2025 23:14:55 +0200 Message-Id: <20250424211455.242482-8-pablo@netfilter.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20250424211455.242482-1-pablo@netfilter.org> References: <20250424211455.242482-1-pablo@netfilter.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Florian Westphal nf_tables picks a suitable set backend implementation (bitmap, hash, rbtree..) based on the userspace requirements. Figuring out the chosen backend requires information about the set flags and the kernel version. Export this to userspace so nft can include this information in '--debug=netlink' output. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- include/uapi/linux/netfilter/nf_tables.h | 4 ++++ net/netfilter/nf_tables_api.c | 26 ++++++++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h index 49c944e78463..7d6bc19a0153 100644 --- a/include/uapi/linux/netfilter/nf_tables.h +++ b/include/uapi/linux/netfilter/nf_tables.h @@ -394,6 +394,8 @@ enum nft_set_field_attributes { * @NFTA_SET_HANDLE: set handle (NLA_U64) * @NFTA_SET_EXPR: set expression (NLA_NESTED: nft_expr_attributes) * @NFTA_SET_EXPRESSIONS: list of expressions (NLA_NESTED: nft_list_attributes) + * @NFTA_SET_TYPE: set backend type (NLA_STRING) + * @NFTA_SET_COUNT: number of set elements (NLA_U32) */ enum nft_set_attributes { NFTA_SET_UNSPEC, @@ -415,6 +417,8 @@ enum nft_set_attributes { NFTA_SET_HANDLE, NFTA_SET_EXPR, NFTA_SET_EXPRESSIONS, + NFTA_SET_TYPE, + NFTA_SET_COUNT, __NFTA_SET_MAX }; #define NFTA_SET_MAX (__NFTA_SET_MAX - 1) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index a133e1c175ce..b28f6730e26d 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -4569,6 +4569,8 @@ static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { [NFTA_SET_HANDLE] = { .type = NLA_U64 }, [NFTA_SET_EXPR] = { .type = NLA_NESTED }, [NFTA_SET_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy), + [NFTA_SET_TYPE] = { .type = NLA_REJECT }, + [NFTA_SET_COUNT] = { .type = NLA_REJECT }, }; static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = { @@ -4763,6 +4765,27 @@ static u32 nft_set_userspace_size(const struct nft_set_ops *ops, u32 size) return size; } +static noinline_for_stack int +nf_tables_fill_set_info(struct sk_buff *skb, const struct nft_set *set) +{ + unsigned int nelems; + char str[40]; + int ret; + + ret = snprintf(str, sizeof(str), "%ps", set->ops); + + /* Not expected to happen and harmless: NFTA_SET_TYPE is dumped + * to userspace purely for informational/debug purposes. + */ + DEBUG_NET_WARN_ON_ONCE(ret >= sizeof(str)); + + if (nla_put_string(skb, NFTA_SET_TYPE, str)) + return -EMSGSIZE; + + nelems = nft_set_userspace_size(set->ops, atomic_read(&set->nelems)); + return nla_put_be32(skb, NFTA_SET_COUNT, htonl(nelems)); +} + static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, const struct nft_set *set, u16 event, u16 flags) { @@ -4843,6 +4866,9 @@ static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, nla_nest_end(skb, nest); + if (nf_tables_fill_set_info(skb, set)) + goto nla_put_failure; + if (set->num_exprs == 1) { nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR); if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0) -- 2.30.2