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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EDFF0C4332F for ; Mon, 5 Dec 2022 19:36:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234457AbiLETgE (ORCPT ); Mon, 5 Dec 2022 14:36:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234116AbiLETfo (ORCPT ); Mon, 5 Dec 2022 14:35:44 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 002162A714 for ; Mon, 5 Dec 2022 11:32:03 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 925DCB80EFD for ; Mon, 5 Dec 2022 19:32:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0AEADC433C1; Mon, 5 Dec 2022 19:32:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670268721; bh=5bMzVGY1YiWqGwisWFkNbzx5xsAkkeBLbuNeaP9B05A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vva26Bq1d1od2Qdr3A18PhUBLAhKrWKxxgXuXX2/6dPHlhsZoZCMXiYI3FFV5T7i/ Jj/VQNTx6R2HPYnvQ8/aarEhwoCOwbpF96TKDqZPgbbYMzLgUicN/FMsvZNZYoMBOq 5W8Lg4GpYTojBP9Brc0ebyikn63ewbRCGtmXVSVA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jonas Gorski , Ido Schimmel , Nikolay Aleksandrov , David Ahern , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.10 81/92] ipv4: Fix route deletion when nexthop info is not specified Date: Mon, 5 Dec 2022 20:10:34 +0100 Message-Id: <20221205190806.150192993@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221205190803.464934752@linuxfoundation.org> References: <20221205190803.464934752@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ido Schimmel [ Upstream commit d5082d386eee7e8ec46fa8581932c81a4961dcef ] When the kernel receives a route deletion request from user space it tries to delete a route that matches the route attributes specified in the request. If only prefix information is specified in the request, the kernel should delete the first matching FIB alias regardless of its associated FIB info. However, an error is currently returned when the FIB info is backed by a nexthop object: # ip nexthop add id 1 via 192.0.2.2 dev dummy10 # ip route add 198.51.100.0/24 nhid 1 # ip route del 198.51.100.0/24 RTNETLINK answers: No such process Fix by matching on such a FIB info when legacy nexthop attributes are not specified in the request. An earlier check already covers the case where a nexthop ID is specified in the request. Add tests that cover these flows. Before the fix: # ./fib_nexthops.sh -t ipv4_fcnal ... TEST: Delete route when not specifying nexthop attributes [FAIL] Tests passed: 11 Tests failed: 1 After the fix: # ./fib_nexthops.sh -t ipv4_fcnal ... TEST: Delete route when not specifying nexthop attributes [ OK ] Tests passed: 12 Tests failed: 0 No regressions in other tests: # ./fib_nexthops.sh ... Tests passed: 228 Tests failed: 0 # ./fib_tests.sh ... Tests passed: 186 Tests failed: 0 Cc: stable@vger.kernel.org Reported-by: Jonas Gorski Tested-by: Jonas Gorski Fixes: 493ced1ac47c ("ipv4: Allow routes to use nexthop objects") Fixes: 6bf92d70e690 ("net: ipv4: fix route with nexthop object delete warning") Fixes: 61b91eb33a69 ("ipv4: Handle attempt to delete multipath route when fib_info contains an nh reference") Signed-off-by: Ido Schimmel Reviewed-by: Nikolay Aleksandrov Reviewed-by: David Ahern Link: https://lore.kernel.org/r/20221124210932.2470010-1-idosch@nvidia.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv4/fib_semantics.c | 8 +++++--- tools/testing/selftests/net/fib_nexthops.sh | 11 +++++++++++ 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index f62b1739f63b..52ec0c43e6b8 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -887,9 +887,11 @@ int fib_nh_match(struct net *net, struct fib_config *cfg, struct fib_info *fi, return 1; } - /* cannot match on nexthop object attributes */ - if (fi->nh) - return 1; + if (fi->nh) { + if (cfg->fc_oif || cfg->fc_gw_family || cfg->fc_mp) + return 1; + return 0; + } if (cfg->fc_oif || cfg->fc_gw_family) { struct fib_nh *nh; diff --git a/tools/testing/selftests/net/fib_nexthops.sh b/tools/testing/selftests/net/fib_nexthops.sh index 050c1e0f1b0f..7ece4131dc6f 100755 --- a/tools/testing/selftests/net/fib_nexthops.sh +++ b/tools/testing/selftests/net/fib_nexthops.sh @@ -950,6 +950,17 @@ ipv4_fcnal() run_cmd "$IP ro add 172.16.101.0/24 nhid 21" run_cmd "$IP ro del 172.16.101.0/24 nexthop via 172.16.1.7 dev veth1 nexthop via 172.16.1.8 dev veth1" log_test $? 2 "Delete multipath route with only nh id based entry" + + run_cmd "$IP nexthop add id 22 via 172.16.1.6 dev veth1" + run_cmd "$IP ro add 172.16.102.0/24 nhid 22" + run_cmd "$IP ro del 172.16.102.0/24 dev veth1" + log_test $? 2 "Delete route when specifying only nexthop device" + + run_cmd "$IP ro del 172.16.102.0/24 via 172.16.1.6" + log_test $? 2 "Delete route when specifying only gateway" + + run_cmd "$IP ro del 172.16.102.0/24" + log_test $? 0 "Delete route when not specifying nexthop attributes" } ipv4_grp_fcnal() -- 2.35.1