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 X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 C8304C433ED for ; Wed, 5 May 2021 16:47:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9C159613F1 for ; Wed, 5 May 2021 16:47:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235333AbhEEQsX (ORCPT ); Wed, 5 May 2021 12:48:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:39262 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235510AbhEEQmG (ORCPT ); Wed, 5 May 2021 12:42:06 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1F22E61429; Wed, 5 May 2021 16:34:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620232492; bh=bx9BBY/AfT4RyPg1holEfsAsmhFrOH7twyygm48EmYU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jdAN8w9kE1JyXVvJY1S4kALOK3MvvYN8/4T1aS5juujsyva2xX9LIRhh+mzAjEOTo X1r1xH30zOtV6/cZjOTvqWsoe0adRj9doyYrazQUCiyz8N612mzOxb2CSU9nwIqNEw Kf42/2O6wGuIsVT92/N0bl4Ujfrr5udVjLRvkcJgKeIoQOWjWU9GGu/yAk9sYIC38v inuOuoC52tyIZW0NFiSuVzVP+frWqHPfRgtkxHmj21BcFRzQswkXN+xLvLQ89U2USn w2/NwPJWGv6aO9ec0f7XEpDyUoTE7293xrWbH54+b5YW9WGg60pVkI7BaYojB+gnKh /LoCDgHEItXyQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nikolay Aleksandrov , Amer Abdalamer , "David S . Miller" , Sasha Levin , bridge@lists.linux-foundation.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.11 027/104] net: bridge: when suppression is enabled exclude RARP packets Date: Wed, 5 May 2021 12:32:56 -0400 Message-Id: <20210505163413.3461611-27-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210505163413.3461611-1-sashal@kernel.org> References: <20210505163413.3461611-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nikolay Aleksandrov [ Upstream commit 0353b4a96b7a9f60fe20d1b3ebd4931a4085f91c ] Recently we had an interop issue where RARP packets got suppressed with bridge neigh suppression enabled, but the check in the code was meant to suppress GARP. Exclude RARP packets from it which would allow some VMWare setups to work, to quote the report: "Those RARP packets usually get generated by vMware to notify physical switches when vMotion occurs. vMware may use random sip/tip or just use sip=tip=0. So the RARP packet sometimes get properly flooded by the vtep and other times get dropped by the logic" Reported-by: Amer Abdalamer Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/bridge/br_arp_nd_proxy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/bridge/br_arp_nd_proxy.c b/net/bridge/br_arp_nd_proxy.c index dfec65eca8a6..3db1def4437b 100644 --- a/net/bridge/br_arp_nd_proxy.c +++ b/net/bridge/br_arp_nd_proxy.c @@ -160,7 +160,9 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, if (br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) { if (p && (p->flags & BR_NEIGH_SUPPRESS)) return; - if (ipv4_is_zeronet(sip) || sip == tip) { + if (parp->ar_op != htons(ARPOP_RREQUEST) && + parp->ar_op != htons(ARPOP_RREPLY) && + (ipv4_is_zeronet(sip) || sip == tip)) { /* prevent flooding to neigh suppress ports */ BR_INPUT_SKB_CB(skb)->proxyarp_replied = 1; return; -- 2.30.2