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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 147FEC76186 for ; Wed, 24 Jul 2019 19:32:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DC08F229FA for ; Wed, 24 Jul 2019 19:32:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563996767; bh=QaNt2Bqoz293TI+9GC4n2RO3J6yhqrLe95Wmi1UZT4U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HGjBMpfzRwZ2nhSt+tzP85kwx2qC6mOwjDhUbPR3E4qQc5ooyQqvPTJGPvDS1sFdQ hls2iHTDdrvm7zRBOF1iBzPhiqiNjXMXqvtASkmHTvNihYUTksRo++NlVaLSAX6u8s f5CD5Ql+2zgyf0oTuKt+e15sbnH4++KTWgtCH+PQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388702AbfGXTcq (ORCPT ); Wed, 24 Jul 2019 15:32:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:54094 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387727AbfGXTcj (ORCPT ); Wed, 24 Jul 2019 15:32:39 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9DEE120659; Wed, 24 Jul 2019 19:32:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563996759; bh=QaNt2Bqoz293TI+9GC4n2RO3J6yhqrLe95Wmi1UZT4U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Oy4l3/n4t+trSyAEMchG0bqGL/UrCh+gnH0Hm+kAZmtQ2pZErK/hd3RguWT5KwZIh 2yUD+Z5P1iSqVxdO2XFS+BRFJ4eI77+JhAFeCgiAwoeHs1tx2gzg8fBzSM0hTwLrAw BDoo6v9eKahedWmXzo1cHDhX8s5QYbH3SWDaubkw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yi Zhao , He Zhe , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 5.2 204/413] netfilter: Fix remainder of pseudo-header protocol 0 Date: Wed, 24 Jul 2019 21:18:15 +0200 Message-Id: <20190724191749.116655234@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190724191735.096702571@linuxfoundation.org> References: <20190724191735.096702571@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 5d1549847c76b1ffcf8e388ef4d0f229bdd1d7e8 ] Since v5.1-rc1, some types of packets do not get unreachable reply with the following iptables setting. Fox example, $ iptables -A INPUT -p icmp --icmp-type 8 -j REJECT $ ping 127.0.0.1 -c 1 PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data. — 127.0.0.1 ping statistics — 1 packets transmitted, 0 received, 100% packet loss, time 0ms We should have got the following reply from command line, but we did not. >>From 127.0.0.1 icmp_seq=1 Destination Port Unreachable Yi Zhao reported it and narrowed it down to: 7fc38225363d ("netfilter: reject: skip csum verification for protocols that don't support it"), This is because nf_ip_checksum still expects pseudo-header protocol type 0 for packets that are of neither TCP or UDP, and thus ICMP packets are mistakenly treated as TCP/UDP. This patch corrects the conditions in nf_ip_checksum and all other places that still call it with protocol 0. Fixes: 7fc38225363d ("netfilter: reject: skip csum verification for protocols that don't support it") Reported-by: Yi Zhao Signed-off-by: He Zhe Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nf_conntrack_proto_icmp.c | 2 +- net/netfilter/nf_nat_proto.c | 2 +- net/netfilter/utils.c | 5 +++-- 3 files changed, 5 insertions(+), 4 deletions(-) diff --git a/net/netfilter/nf_conntrack_proto_icmp.c b/net/netfilter/nf_conntrack_proto_icmp.c index a824367ed518..dd53e2b20f6b 100644 --- a/net/netfilter/nf_conntrack_proto_icmp.c +++ b/net/netfilter/nf_conntrack_proto_icmp.c @@ -218,7 +218,7 @@ int nf_conntrack_icmpv4_error(struct nf_conn *tmpl, /* See ip_conntrack_proto_tcp.c */ if (state->net->ct.sysctl_checksum && state->hook == NF_INET_PRE_ROUTING && - nf_ip_checksum(skb, state->hook, dataoff, 0)) { + nf_ip_checksum(skb, state->hook, dataoff, IPPROTO_ICMP)) { icmp_error_log(skb, state, "bad hw icmp checksum"); return -NF_ACCEPT; } diff --git a/net/netfilter/nf_nat_proto.c b/net/netfilter/nf_nat_proto.c index 07da07788f6b..83a24cc5753b 100644 --- a/net/netfilter/nf_nat_proto.c +++ b/net/netfilter/nf_nat_proto.c @@ -564,7 +564,7 @@ int nf_nat_icmp_reply_translation(struct sk_buff *skb, if (!skb_make_writable(skb, hdrlen + sizeof(*inside))) return 0; - if (nf_ip_checksum(skb, hooknum, hdrlen, 0)) + if (nf_ip_checksum(skb, hooknum, hdrlen, IPPROTO_ICMP)) return 0; inside = (void *)skb->data + hdrlen; diff --git a/net/netfilter/utils.c b/net/netfilter/utils.c index 06dc55590441..51b454d8fa9c 100644 --- a/net/netfilter/utils.c +++ b/net/netfilter/utils.c @@ -17,7 +17,8 @@ __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook, case CHECKSUM_COMPLETE: if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN) break; - if ((protocol == 0 && !csum_fold(skb->csum)) || + if ((protocol != IPPROTO_TCP && protocol != IPPROTO_UDP && + !csum_fold(skb->csum)) || !csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len - dataoff, protocol, skb->csum)) { @@ -26,7 +27,7 @@ __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook, } /* fall through */ case CHECKSUM_NONE: - if (protocol == 0) + if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP) skb->csum = 0; else skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, -- 2.20.1