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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 08345C2BA2B for ; Sat, 11 Apr 2020 12:13:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D664F21556 for ; Sat, 11 Apr 2020 12:13:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586607219; bh=8b6+SjPVlptKlpHpNs5BryqjkHoJs5ngMdVdKcZM1GY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2AOGlGwpJTt+gtVw4Yi+gGj5RBmGg7W6zyBoOjWh+nIOF91N0XJBsTXiOG1+MYxDV U38CuLarRUhWm/kfOS8WaRg3JdMDQ1nM4APkJGc+mhS+sUbL2Agl++05xxNtg09kFb IAAf5x50etx0jS3ax8HasnFTib9AuRREf8g4VXGU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726182AbgDKMNh (ORCPT ); Sat, 11 Apr 2020 08:13:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:46546 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727806AbgDKMNb (ORCPT ); Sat, 11 Apr 2020 08:13:31 -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 DF8A821835; Sat, 11 Apr 2020 12:13:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586607211; bh=8b6+SjPVlptKlpHpNs5BryqjkHoJs5ngMdVdKcZM1GY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UzvoKZw+2FKeFUlF9IQBl8MlIx8VUDOu00KM0zp7WvMlRBVA+k0P/jZ2XeHC3dJ0s UjxzZA2s6tK3ofi0e2H32+QsbJDT8A2TNg8nL9KGDgNyshK4RxHLhGX53y1iuRwG6A MA7iRWk3H+M8J2Bdt5+dyCrqm86R8/cBYNtd2Tow= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, William Dauchy , Nicolas Dichtel , "David S. Miller" Subject: [PATCH 4.14 02/38] net, ip_tunnel: fix interface lookup with no key Date: Sat, 11 Apr 2020 14:08:46 +0200 Message-Id: <20200411115437.998346755@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200411115437.795556138@linuxfoundation.org> References: <20200411115437.795556138@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 From: William Dauchy [ Upstream commit 25629fdaff2ff509dd0b3f5ff93d70a75e79e0a1 ] when creating a new ipip interface with no local/remote configuration, the lookup is done with TUNNEL_NO_KEY flag, making it impossible to match the new interface (only possible match being fallback or metada case interface); e.g: `ip link add tunl1 type ipip dev eth0` To fix this case, adding a flag check before the key comparison so we permit to match an interface with no local/remote config; it also avoids breaking possible userland tools relying on TUNNEL_NO_KEY flag and uninitialised key. context being on my side, I'm creating an extra ipip interface attached to the physical one, and moving it to a dedicated namespace. Fixes: c54419321455 ("GRE: Refactor GRE tunneling code.") Signed-off-by: William Dauchy Signed-off-by: Nicolas Dichtel Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/ip_tunnel.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -155,11 +155,8 @@ struct ip_tunnel *ip_tunnel_lookup(struc cand = t; } - if (flags & TUNNEL_NO_KEY) - goto skip_key_lookup; - hlist_for_each_entry_rcu(t, head, hash_node) { - if (t->parms.i_key != key || + if ((!(flags & TUNNEL_NO_KEY) && t->parms.i_key != key) || t->parms.iph.saddr != 0 || t->parms.iph.daddr != 0 || !(t->dev->flags & IFF_UP)) @@ -171,7 +168,6 @@ struct ip_tunnel *ip_tunnel_lookup(struc cand = t; } -skip_key_lookup: if (cand) return cand;