From patchwork Tue Apr 7 10:21:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 228147 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=-6.9 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=unavailable 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 9EC78C2BB1D for ; Tue, 7 Apr 2020 10:28:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6B1D02078A for ; Tue, 7 Apr 2020 10:28:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586255326; bh=+9/waoq6urivDfNZvIaeIMosuJ6pHCmjRRVUUlB8Uig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lNnDvK5OeN/I4cSgWIkQp+6LDBfcSDnHN5+/wQExD9H2a3iA3MM2O6A1SKa/pKlPw P8imCyujjK42X5nI+5sWCTR1OW6HzCErDBDayPdqt8Ipqb3QVDmo63OncH8tgHzCWe RiYVnk0IEZ7dp45kd4TvvE2iWyhw14rzmAW1nZgg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728460AbgDGKY4 (ORCPT ); Tue, 7 Apr 2020 06:24:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:35316 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728829AbgDGKY4 (ORCPT ); Tue, 7 Apr 2020 06:24:56 -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 8BA4220644; Tue, 7 Apr 2020 10:24:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586255095; bh=+9/waoq6urivDfNZvIaeIMosuJ6pHCmjRRVUUlB8Uig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uMG3VH7ScGv6b/gxvFtk1sCnJhMJ2BD+vZKMQmi0YuMCQhbVZgiio42W3oEeWNGhP yRg8lnVLycIxMODYDvub/c8+Z0BJBUZsLTx252fe/gLfpjjGh0holGH6xfrveKtbaR HXF9DIe5GC7Ta3Ro7tvBFNRfFT2Vn2a6Hq2LEsoU= 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 5.5 03/46] net, ip_tunnel: fix interface lookup with no key Date: Tue, 7 Apr 2020 12:21:34 +0200 Message-Id: <20200407101459.875071972@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200407101459.502593074@linuxfoundation.org> References: <20200407101459.502593074@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 @@ -142,11 +142,8 @@ 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)) @@ -158,7 +155,6 @@ struct ip_tunnel *ip_tunnel_lookup(struc cand = t; } -skip_key_lookup: if (cand) return cand;