From patchwork Tue Jul 20 20:06:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Fedorenko X-Patchwork-Id: 12389199 X-Patchwork-Delegate: kuba@kernel.org 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,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 03A35C07E95 for ; Tue, 20 Jul 2021 20:11:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D70656024A for ; Tue, 20 Jul 2021 20:11:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232712AbhGTT3T (ORCPT ); Tue, 20 Jul 2021 15:29:19 -0400 Received: from novek.ru ([213.148.174.62]:46314 "EHLO novek.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232241AbhGTT0Z (ORCPT ); Tue, 20 Jul 2021 15:26:25 -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 1FAEA503E20; Tue, 20 Jul 2021 23:04:30 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 novek.ru 1FAEA503E20 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=novek.ru; s=mail; t=1626811471; bh=gW3aGHf/lDdAM5zBNFyaoJKkvl1CnxQ7OgOl2qK9pzA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E4bTo+8zUWD0ygD8+PR+1S42lpYjk6cUhhtsrUsygxgv17cpXKzOmqtzKCRzOZyVP Ts2VRayP2kh4Q/5vqsbOTRPAFd6lUonYLypegUm2OOaChlUb/lATSK7YHcslG3XW85 i32wqH+FA36w1bTDw8XBVTMdOuul37G8NP333I8Q= From: Vadim Fedorenko To: David Ahern Cc: Jakub Kicinski , "David S. Miller" , netdev@vger.kernel.org, Hideaki YOSHIFUJI , Vadim Fedorenko , Pablo Neira Ayuso , Florian Westphal Subject: [PATCH RESEND net-next 1/2] net: ipv6: introduce ip6_dst_mtu_maybe_forward Date: Tue, 20 Jul 2021 23:06:27 +0300 Message-Id: <20210720200628.16805-2-vfedorenko@novek.ru> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20210720200628.16805-1-vfedorenko@novek.ru> References: <20210720200628.16805-1-vfedorenko@novek.ru> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@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 Reviewed-by: David Ahern --- 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 625a38ccb5d9..820eae3ea95f 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 01bea76e3891..f6bc7828a480 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -607,7 +607,7 @@ 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; }