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 A8A41144D15; Thu, 13 Jun 2024 11:45:54 +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=1718279154; cv=none; b=BKbzyOfjzPgcWhuIrVJgpgvL4Lz8fq8nCEDbrfa9xmXo22qq/95QVT/3IhWeDKge4J1PRTV+qVXV+3Gsbm5PZzyDprSiYdWGafEKMvmaNTBj0Je2ipy+eV7pp+KctilsL/pa9UiEx5h2FD5a8Bxe/ZTuZwNIm8nCmdPfKOHaCwE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718279154; c=relaxed/simple; bh=SOTq1H0pnax8JHNgBlWYNzE2ywT0sJJoYMy+gPdDmhU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KYlzmruMfziY+leQHrXBoFm6EzL5NfJpOZrLTYPUB4li1fKJMHTY0GxYDYJQ3wDlkRUPLboDp3WZWmz2eFne1L77whQqGvlFA17SjhcvCddl22Rjc7rH53UgkVsvdFJ1/Y6ah0pXg4c7vhtlzLscNQpwbeFWK/eiNIcoD4Q8elg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=V9I1UwFY; 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="V9I1UwFY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6082C2BBFC; Thu, 13 Jun 2024 11:45:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1718279154; bh=SOTq1H0pnax8JHNgBlWYNzE2ywT0sJJoYMy+gPdDmhU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V9I1UwFYXgzp/4nLTXZFC2cQ3cn+51wtoGegaktTNgrRtKa2BpeNkVvYqA85mvN2Y fvQOG3dmnx+4sui9DP9G12ZWhHl/C0JzCzyWwjU2hAbFsCnSKSSk+43iU+Z4szYZPT HH/CBelYz+6lwXtqB4mnvtLUtQS9frByT6GlmzrI= From: Greg Kroah-Hartman To: stable@vger.kernel.org, netfilter-devel@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jordan Griege , Ignat Korchagin , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 4.19 194/213] netfilter: nf_tables: allow NFPROTO_INET in nft_(match/target)_validate() Date: Thu, 13 Jun 2024 13:34:02 +0200 Message-ID: <20240613113235.461350744@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240613113227.969123070@linuxfoundation.org> References: <20240613113227.969123070@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: netfilter-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-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 Signed-off-by: Greg Kroah-Hartman --- net/netfilter/nft_compat.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) --- a/net/netfilter/nft_compat.c +++ b/net/netfilter/nft_compat.c @@ -321,10 +321,20 @@ static int nft_target_validate(const str 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); @@ -568,10 +578,20 @@ static int nft_match_validate(const stru 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);