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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 E687BC00449 for ; Wed, 3 Oct 2018 05:25:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A86EC206B2 for ; Wed, 3 Oct 2018 05:25:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A86EC206B2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=davemloft.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726741AbeJCMM3 (ORCPT ); Wed, 3 Oct 2018 08:12:29 -0400 Received: from shards.monkeyblade.net ([23.128.96.9]:54560 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726510AbeJCMM3 (ORCPT ); Wed, 3 Oct 2018 08:12:29 -0400 Received: from localhost (c-67-183-145-105.hsd1.wa.comcast.net [67.183.145.105]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id DDC5213ADE6DB; Tue, 2 Oct 2018 22:25:40 -0700 (PDT) Date: Tue, 02 Oct 2018 22:25:40 -0700 (PDT) Message-Id: <20181002.222540.1948082296309410659.davem@davemloft.net> To: vdronov@redhat.com Cc: kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, netdev@vger.kernel.org, syzkaller@googlegroups.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] net: arp, ipv6: handle special case of tap device From: David Miller In-Reply-To: <1615981257.17285278.1538393552487.JavaMail.zimbra@redhat.com> References: <20180926093018.6646-1-vdronov@redhat.com> <20180929.114023.1370133506922372520.davem@davemloft.net> <1615981257.17285278.1538393552487.JavaMail.zimbra@redhat.com> X-Mailer: Mew version 6.7 on Emacs 26 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Tue, 02 Oct 2018 22:25:41 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vladis Dronov Date: Mon, 1 Oct 2018 07:32:32 -0400 (EDT) > Probably, this functionality is already used by some userspace, so I > believe, I cannot just remove TUNSETLINK ioctl. Who uses it, how do they use it, and what do they sanely expect about the link layer header properties of a tap device which has had ->type changed?