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=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 E04EEC35242 for ; Tue, 11 Feb 2020 19:47:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BCF0B2086A for ; Tue, 11 Feb 2020 19:47:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="Cscf9pi2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729555AbgBKTr1 (ORCPT ); Tue, 11 Feb 2020 14:47:27 -0500 Received: from frisell.zx2c4.com ([192.95.5.64]:52685 "EHLO frisell.zx2c4.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728448AbgBKTr0 (ORCPT ); Tue, 11 Feb 2020 14:47:26 -0500 Received: by frisell.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 6f9f2e92; Tue, 11 Feb 2020 19:45:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=zx2c4.com; h=from:to:cc :subject:date:message-id:mime-version:content-transfer-encoding; s=mail; bh=op6WHeg/1QNzAvID/xPxIANnoAU=; b=Cscf9pi2nx6HIkrtBbsF FKduWr+brblH2UsJby6zVRkbUHpUAJN8WQ/bB/GS+446Z6ZJQ6wdheAszbpsRCeT WZGh7xYtvmKoiO2GOyBKeN0SwXgpK+WYrj3f4htCVa+CMytzqfUcItwWfiehHYQ+ KBAAOI6zKV1v6pqZnWvPt8a/Xm7YWaT5V4uFabgSd87VOgpkZ/601D7mHTTdldVn t5x2KPExc5t7+um62la6aLgztkqTvKJ4gNllYOUjHtFRt66n6czHfp7B7l4PJSXu EXi1KgdVeLc9+x6SfwynUh6ESJGzOsRDqnsmECmzP4LCFw0slpFs96wZfmdn1NV4 +Q== Received: by frisell.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id 699ceed6 (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256:NO); Tue, 11 Feb 2020 19:45:39 +0000 (UTC) From: "Jason A. Donenfeld" To: netdev@vger.kernel.org, davem@davemloft.net Cc: "Jason A. Donenfeld" , netfilter-devel@vger.kernel.org Subject: [PATCH v4 net 0/5] icmp: account for NAT when sending icmps from ndo layer Date: Tue, 11 Feb 2020 20:47:04 +0100 Message-Id: <20200211194709.723383-1-Jason@zx2c4.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The ICMP routines use the source address for two reasons: 1. Rate-limiting ICMP transmissions based on source address, so that one source address cannot provoke a flood of replies. If the source address is wrong, the rate limiting will be incorrectly applied. 2. Choosing the interface and hence new source address of the generated ICMP packet. If the original packet source address is wrong, ICMP replies will be sent from the wrong source address, resulting in either a misdelivery, infoleak, or just general network admin confusion. Most of the time, the icmp_send and icmpv6_send routines can just reach down into the skb's IP header to determine the saddr. However, if icmp_send or icmpv6_send is being called from a network device driver -- there are a few in the tree -- then it's possible that by the time icmp_send or icmpv6_send looks at the packet, the packet's source address has already been transformed by SNAT or MASQUERADE or some other transformation that CONNTRACK knows about. In this case, the packet's source address is most certainly the *wrong* source address to be used for the purpose of ICMP replies. Rather, the source address we want to use for ICMP replies is the original one, from before the transformation occurred. Fortunately, it's very easy to just ask CONNTRACK if it knows about this packet, and if so, how to fix it up. The saddr is the only field in the header we need to fix up, for the purposes of the subsequent processing in the icmp_send and icmpv6_send functions, so we do the lookup very early on, so that the rest of the ICMP machinery can progress as usual. Changes v3->v4: - Add back the skb_shared checking, since the previous assumption isn't actually true [Eric]. This implies dropping the additional patches v3 had for removing skb_share_check from various drivers. We can revisit that general set of ideas later, but that's probably better suited as a net-next patchset rather than this stable one which is geared at fixing bugs. So, this implements things in the safe conservative way. Changes v2->v3: - Add selftest to ensure this actually does what we want and never regresses. - Check the size of the skb header before operating on it. - Use skb_ensure_writable to ensure we can modify the cloned skb [Florian]. - Conditionalize this on IPS_SRC_NAT so we don't do anything unnecessarily [Florian]. - It turns out that since we're calling these from the xmit path, skb_share_check isn't required, so remove that [Florian]. This simplifes the code a bit too. **The supposition here is that skbs passed to ndo_start_xmit are _never_ shared. If this is not correct NOW IS THE TIME TO PIPE UP, for doom awaits us later.** - While investigating the shared skb business, several drivers appeared to be calling it incorrectly in the xmit path, so this series also removes those unnecessary calls, based on the supposition mentioned in the previous point. Changes v1->v2: - icmpv6 takes subtly different types than icmpv4, like u32 instead of be32, u8 instead of int. - Since we're technically writing to the skb, we need to make sure it's not a shared one [Dave, 2017]. - Restore the original skb data after icmp_send returns. All current users are freeing the packet right after, so it doesn't matter, but future users might not. - Remove superfluous route lookup in sunvnet [Dave]. - Use NF_NAT instead of NF_CONNTRACK for condition [Florian]. - Include this cover letter [Dave]. Cc: netdev@vger.kernel.org Cc: netfilter-devel@vger.kernel.org Jason A. Donenfeld (5): icmp: introduce helper for nat'd source address in network device context gtp: use icmp_ndo_send helper sunvnet: use icmp_ndo_send helper wireguard: device: use icmp_ndo_send helper xfrm: interface: use icmp_ndo_send helper drivers/net/ethernet/sun/sunvnet_common.c | 23 +++------------ drivers/net/gtp.c | 4 +-- drivers/net/wireguard/device.c | 4 +-- include/linux/icmpv6.h | 6 ++++ include/net/icmp.h | 6 ++++ net/ipv4/icmp.c | 33 +++++++++++++++++++++ net/ipv6/ip6_icmp.c | 34 ++++++++++++++++++++++ net/xfrm/xfrm_interface.c | 6 ++-- tools/testing/selftests/wireguard/netns.sh | 11 +++++++ 9 files changed, 101 insertions(+), 26 deletions(-) -- 2.25.0