From patchwork Thu Jul 1 01:17:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Fedorenko X-Patchwork-Id: 469851 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 1B2DEC11F66 for ; Thu, 1 Jul 2021 01:17:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 014AC613FC for ; Thu, 1 Jul 2021 01:17:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238358AbhGABUL (ORCPT ); Wed, 30 Jun 2021 21:20:11 -0400 Received: from novek.ru ([213.148.174.62]:59392 "EHLO novek.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238352AbhGABUJ (ORCPT ); Wed, 30 Jun 2021 21:20:09 -0400 Received: from nat1.ooonet.ru (gw.zelenaya.net [91.207.137.40]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by novek.ru (Postfix) with ESMTPSA id 23695503C0F; Thu, 1 Jul 2021 04:15:34 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 novek.ru 23695503C0F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=novek.ru; s=mail; t=1625102136; bh=NQUurqQ0XpgIceRk7xT+4ni893tKBP1oaQXN708e3RA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Em7hCT72d/DLnYuQyglDx1Qt3j3qG6CXPFO+dAf2jg5arnNj+7KBZHpnh/tZKlPD+ jHSyWUK1kDctB0F1bkn4aiq2LEfiAPwpfZtTrbLfAzVEbrRv3HaLgw0vliBW0q7twH CsPtEDCDyj6uGCkrwYdVKc7ZiJYpQ3IOGhkWPhC8= From: Vadim Fedorenko To: David Ahern , netdev@vger.kernel.org Cc: Jakub Kicinski , Hideaki YOSHIFUJI , "David S. Miller" , Pablo Neira Ayuso , Florian Westphal , Vadim Fedorenko Subject: [RFC net-next 1/2] net: ipv6: introduce ip6_dst_mtu_maybe_forward Date: Thu, 1 Jul 2021 04:17:27 +0300 Message-Id: <20210701011728.22626-2-vfedorenko@novek.ru> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20210701011728.22626-1-vfedorenko@novek.ru> References: <20210701011728.22626-1-vfedorenko@novek.ru> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Replace ip6_dst_mtu_forward with ip6_dst_mtu_maybe_forward and reuse this code in ip6_mtu. Actually these two functions were almost duplicates, this change will simplify the maintaince of mtu calculation code. Signed-off-by: Vadim Fedorenko --- include/net/ip6_route.h | 5 +++-- net/ipv6/ip6_output.c | 2 +- net/ipv6/route.c | 20 +------------------- net/netfilter/nf_flow_table_core.c | 2 +- 4 files changed, 6 insertions(+), 23 deletions(-) diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index f14149df5a65..322960506528 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -316,12 +316,13 @@ static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info * !lwtunnel_cmp_encap(nha->fib_nh_lws, nhb->fib_nh_lws); } -static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst) +static inline unsigned int ip6_dst_mtu_maybe_forward(const struct dst_entry *dst, + bool forwarding) { struct inet6_dev *idev; unsigned int mtu; - if (dst_metric_locked(dst, RTAX_MTU)) { + if (!forwarding || dst_metric_locked(dst, RTAX_MTU)) { mtu = dst_metric_raw(dst, RTAX_MTU); if (mtu) goto out; diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 984050f35c61..bdfe96fe6fc3 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -577,7 +577,7 @@ int ip6_forward(struct sk_buff *skb) } } - mtu = ip6_dst_mtu_forward(dst); + mtu = ip6_dst_mtu_maybe_forward(dst, true); if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 7b756a7dc036..da2c651325e2 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -3201,25 +3201,7 @@ static unsigned int ip6_default_advmss(const struct dst_entry *dst) INDIRECT_CALLABLE_SCOPE unsigned int ip6_mtu(const struct dst_entry *dst) { - struct inet6_dev *idev; - unsigned int mtu; - - mtu = dst_metric_raw(dst, RTAX_MTU); - if (mtu) - goto out; - - mtu = IPV6_MIN_MTU; - - rcu_read_lock(); - idev = __in6_dev_get(dst->dev); - if (idev) - mtu = idev->cnf.mtu6; - rcu_read_unlock(); - -out: - mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); - - return mtu - lwtunnel_headroom(dst->lwtstate, mtu); + return ip6_dst_mtu_maybe_forward(dst, false); } EXPORT_INDIRECT_CALLABLE(ip6_mtu); diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c index 1e50908b1b7e..8fe024a0ae46 100644 --- a/net/netfilter/nf_flow_table_core.c +++ b/net/netfilter/nf_flow_table_core.c @@ -99,7 +99,7 @@ static int flow_offload_fill_route(struct flow_offload *flow, flow_tuple->mtu = ip_dst_mtu_maybe_forward(dst, true); break; case NFPROTO_IPV6: - flow_tuple->mtu = ip6_dst_mtu_forward(dst); + flow_tuple->mtu = ip6_dst_mtu_maybe_forward(dst, true); break; }