From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sabrina Dubroca Subject: [PATCH net v2 0/2] net: ipv4: fixes for PMTU when link MTU changes Date: Tue, 9 Oct 2018 17:48:13 +0200 Message-ID: Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Cc: David Ahern , Stefano Brivio , Sabrina Dubroca To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:34920 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726393AbeJIXFn (ORCPT ); Tue, 9 Oct 2018 19:05:43 -0400 Sender: netdev-owner@vger.kernel.org List-ID: The first patch adapts the changes that commit e9fa1495d738 ("ipv6: Reflect MTU changes on PMTU of exceptions for MTU-less routes") did in IPv6 to IPv4: lower PMTU when the first hop's MTU drops below it, and raise PMTU when the first hop was limiting PMTU discovery and its MTU is increased. The second patch fixes bugs introduced in commit d52e5a7e7ca4 ("ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu") that only appear once the first patch is applied. Selftests for these cases were introduced in net-next commit e44e428f59e4 ("selftests: pmtu: add basic IPv4 and IPv6 PMTU tests") v2: add cover letter, and fix a few small things in patch 1 Sabrina Dubroca (2): net: ipv4: update fnhe_pmtu when first hop's MTU changes net: ipv4: don't let PMTU updates increase route MTU include/linux/netdevice.h | 7 ++++++ include/net/ip_fib.h | 1 + net/core/dev.c | 28 ++++++++++++++++++++-- net/ipv4/fib_frontend.c | 12 ++++++---- net/ipv4/fib_semantics.c | 50 +++++++++++++++++++++++++++++++++++++++ net/ipv4/route.c | 7 +++--- 6 files changed, 96 insertions(+), 9 deletions(-) -- 2.19.0