From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 14D977A70D; Mon, 4 Mar 2024 21:33:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709588003; cv=none; b=JWYnghAyX5+xmKV53y7bafKRjdwKFeeh5vb2RpRB4yqGQ61qAaaGIKgIj7tGm3D+nv7rGZ9aazstRuOUg5MzkCvep6he/397ycJ2hMsrSrtecBATApyRU2TZhP9Sh7iFcDEQpUY5DzqI3qhmWvVTzm97Lm8L2b2M7peKBxfacNY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709588003; c=relaxed/simple; bh=4QrQWM5PCKXe4JHN379qQ2Ne6GltjuyEMK+HLEG1brw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IVxkhh769W0W6OhvWLGRK1XTvaJOGONYGlxO9c3zx0pfsiz8PHFqN9HI9pfIvSQEk40yOmBJpda3lurYpcHOaWnzUXUvsBMa3lW/rKqeUG4RM/RlCOd1c/txY8y9FvysIurLZVHgWvOeIQu6m2Q1S+gbpjOdsn+v8jfhny/MBAM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bowEzUZc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="bowEzUZc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DB93C433F1; Mon, 4 Mar 2024 21:33:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1709588003; bh=4QrQWM5PCKXe4JHN379qQ2Ne6GltjuyEMK+HLEG1brw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bowEzUZcMIAQ8AwKRJQ7PNUlgqacmwD16IYAECmnD37MEUFlQxyj4LFticS9I6C54 jnjYt52it+hi/vBnqDQEv8JzNu69skFZStrtSjjpKXYx6jLBHaC8rynh04/+TDR3xM NNMYI0PrU6fz4FpHMiLDO4yAK5yGptUuherhbtZg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jordan Griege , Ignat Korchagin , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 5.4 10/25] netfilter: nf_tables: allow NFPROTO_INET in nft_(match/target)_validate() Date: Mon, 4 Mar 2024 21:23:46 +0000 Message-ID: <20240304211536.087212391@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240304211535.741936181@linuxfoundation.org> References: <20240304211535.741936181@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ignat Korchagin [ Upstream commit 7e0f122c65912740327e4c54472acaa5f85868cb ] Commit d0009effa886 ("netfilter: nf_tables: validate NFPROTO_* family") added some validation of NFPROTO_* families in the nft_compat module, but it broke the ability to use legacy iptables modules in dual-stack nftables. While with legacy iptables one had to independently manage IPv4 and IPv6 tables, with nftables it is possible to have dual-stack tables sharing the rules. Moreover, it was possible to use rules based on legacy iptables match/target modules in dual-stack nftables. As an example, the program from [2] creates an INET dual-stack family table using an xt_bpf based rule, which looks like the following (the actual output was generated with a patched nft tool as the current nft tool does not parse dual stack tables with legacy match rules, so consider it for illustrative purposes only): table inet testfw { chain input { type filter hook prerouting priority filter; policy accept; bytecode counter packets 0 bytes 0 accept } } After d0009effa886 ("netfilter: nf_tables: validate NFPROTO_* family") we get EOPNOTSUPP for the above program. Fix this by allowing NFPROTO_INET for nft_(match/target)_validate(), but also restrict the functions to classic iptables hooks. Changes in v3: * clarify that upstream nft will not display such configuration properly and that the output was generated with a patched nft tool * remove example program from commit description and link to it instead * no code changes otherwise Changes in v2: * restrict nft_(match/target)_validate() to classic iptables hooks * rewrite example program to use unmodified libnftnl Fixes: d0009effa886 ("netfilter: nf_tables: validate NFPROTO_* family") Link: https://lore.kernel.org/all/Zc1PfoWN38UuFJRI@calendula/T/#mc947262582c90fec044c7a3398cc92fac7afea72 [1] Link: https://lore.kernel.org/all/20240220145509.53357-1-ignat@cloudflare.com/ [2] Reported-by: Jordan Griege Signed-off-by: Ignat Korchagin Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nft_compat.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c index 2372f0bbb133d..fdce5012a4f3c 100644 --- a/net/netfilter/nft_compat.c +++ b/net/netfilter/nft_compat.c @@ -336,10 +336,20 @@ static int nft_target_validate(const struct nft_ctx *ctx, if (ctx->family != NFPROTO_IPV4 && ctx->family != NFPROTO_IPV6 && + ctx->family != NFPROTO_INET && ctx->family != NFPROTO_BRIDGE && ctx->family != NFPROTO_ARP) return -EOPNOTSUPP; + ret = nft_chain_validate_hooks(ctx->chain, + (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_LOCAL_IN) | + (1 << NF_INET_FORWARD) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_POST_ROUTING)); + if (ret) + return ret; + if (nft_is_base_chain(ctx->chain)) { const struct nft_base_chain *basechain = nft_base_chain(ctx->chain); @@ -584,10 +594,20 @@ static int nft_match_validate(const struct nft_ctx *ctx, if (ctx->family != NFPROTO_IPV4 && ctx->family != NFPROTO_IPV6 && + ctx->family != NFPROTO_INET && ctx->family != NFPROTO_BRIDGE && ctx->family != NFPROTO_ARP) return -EOPNOTSUPP; + ret = nft_chain_validate_hooks(ctx->chain, + (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_LOCAL_IN) | + (1 << NF_INET_FORWARD) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_POST_ROUTING)); + if (ret) + return ret; + if (nft_is_base_chain(ctx->chain)) { const struct nft_base_chain *basechain = nft_base_chain(ctx->chain); -- 2.43.0