From patchwork Tue May 18 21:08:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarod Wilson X-Patchwork-Id: 12265657 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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 5BF4DC433B4 for ; Tue, 18 May 2021 21:09:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 355BE611BD for ; Tue, 18 May 2021 21:09:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352403AbhERVKi (ORCPT ); Tue, 18 May 2021 17:10:38 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:26670 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352364AbhERVKf (ORCPT ); Tue, 18 May 2021 17:10:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1621372157; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=V9gVBAPRX5DhRtI6vP4WZYcb3SfeyZ7GrIMEVvYHEpI=; b=h1YFYnZy4AMjc2ICdLCn5fhRG8tDFihPcqBKUBnJvXuMl6+X9taSqsN2DG9b6GotBt8buX UNd81xyhasZCe1qlI7tZ7bCx64Jlolys+THZ2Gv6vwJypAXeFv8i96uCPVZkh5SqqBwYh9 QuuKcl39+4m2Nx1eGUcfOt+xe8T8lOk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-57-qN96nNgmPaWsUCsrpB7XZw-1; Tue, 18 May 2021 17:09:15 -0400 X-MC-Unique: qN96nNgmPaWsUCsrpB7XZw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B1568106BAA6; Tue, 18 May 2021 21:09:13 +0000 (UTC) Received: from f33vm.wilsonet.com (dhcp-17-185.bos.redhat.com [10.18.17.185]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7A8CC5C1A1; Tue, 18 May 2021 21:09:12 +0000 (UTC) From: Jarod Wilson To: linux-kernel@vger.kernel.org Cc: Jarod Wilson , Jay Vosburgh , Veaceslav Falico , Andy Gospodarek , "David S. Miller" , Jakub Kicinski , Thomas Davis , netdev@vger.kernel.org Subject: [PATCH 2/4] bond_alb: don't rewrite bridged non-local MACs Date: Tue, 18 May 2021 17:08:47 -0400 Message-Id: <20210518210849.1673577-3-jarod@redhat.com> In-Reply-To: <20210518210849.1673577-1-jarod@redhat.com> References: <20210518210849.1673577-1-jarod@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org With a virtual machine behind a bridge on top of a bond, outgoing traffic should retain the VM's source MAC. That works fine most of the time, until doing a failover, and then the MAC gets rewritten to the bond slave's MAC, and the return traffic gets dropped. If we don't rewrite the MAC there, we don't lose any traffic. Cc: Jay Vosburgh Cc: Veaceslav Falico Cc: Andy Gospodarek Cc: "David S. Miller" Cc: Jakub Kicinski Cc: Thomas Davis Cc: netdev@vger.kernel.org Signed-off-by: Jarod Wilson --- drivers/net/bonding/bond_alb.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index 3455f2cc13f2..ce8257c7cbea 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -1302,6 +1302,26 @@ void bond_alb_deinitialize(struct bonding *bond) rlb_deinitialize(bond); } +static bool bond_alb_bridged_mac(struct bonding *bond, struct ethhdr *eth_data) +{ + struct list_head *iter; + struct slave *slave; + + if (BOND_MODE(bond) != BOND_MODE_ALB) + return false; + + /* Don't modify source MACs that do not originate locally + * (e.g.,arrive via a bridge). + */ + if (!netif_is_bridge_port(bond->dev)) + return false; + + if (bond_slave_has_mac_rx(bond, eth_data->h_source)) + return false; + + return true; +} + static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, struct slave *tx_slave) { @@ -1316,7 +1336,8 @@ static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, } if (tx_slave && bond_slave_can_tx(tx_slave)) { - if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) { + if (tx_slave != rcu_access_pointer(bond->curr_active_slave) && + !bond_alb_bridged_mac(bond, eth_data)) { ether_addr_copy(eth_data->h_source, tx_slave->dev->dev_addr); }