From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9BC1D204583 for ; Fri, 9 Jan 2026 19:50:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767988216; cv=none; b=L4F+nGlcAzOWBLnJEitFEFmwkKufNQ5FlgI/4bcignU70KHOSPq9EnuOg7N3j1V8o65AiYd587iGV6jGUoqVSbMczdQQ8hMgRiNVSThkYFrrwEo43EZ2r6VKopOONHoINk66lggZaUDX6vM255TQWbNdmrpOQIxtFm+a2pywKp8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767988216; c=relaxed/simple; bh=CY9CUckz/9KgBFiL4k2nndH1tjpEz9rtFYrvcg4GLvI=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=BQPpqC1iLUWeuZ3RypDsTEGww8COb8gPW/GMsU9fljEMYsZSCdqZyBfYt4Lgml6YC78Fisfojn7/n7AjThVfv7EJdhSsqPST1rRNRVJL+yT1cD2OI/56XQFMtyCvRaKsAImyqb7DIOoaXtsTXMa8FRE45NMynpvaN2YkLS2WUDY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GfzadPhC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="GfzadPhC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10795C4CEF1; Fri, 9 Jan 2026 19:50:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767988216; bh=CY9CUckz/9KgBFiL4k2nndH1tjpEz9rtFYrvcg4GLvI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=GfzadPhCJLPWqmzN4aRQHQziScGSapympIPS10AZPfdHiZHk/j5i4y5kUtJjcs/I7 4hDxSsKax5bRh2JKrC7c72jkRad8g7enmwvNC5Xd9M8uT54w/H6OyI5+c1NceoIrQg 7sORXK+aty2rNfmapUZbN6M3rNLTRCLT9qrmDZtZIfEDFnNHj366CYsQ7vem8IMs5N kxx68XSJN7vkPebSBj9ozUeGzMwwkLn75j4ABIDH9bPMJzm3a+As4AwxkY0WibHx+3 P5CGCvlkJDHxnWeHRMweOPz6nUDxeOEnxQQt1Y5st/uArvQyvZqebmTjKeJDKLuNCo uqQdcsQBCs8dw== Date: Fri, 9 Jan 2026 11:50:15 -0800 From: Jakub Kicinski To: Tom Herbert Cc: davem@davemloft.net, netdev@vger.kernel.org Subject: Re: [PATCH net-next v2 0/4] ipv6: Disable IPv6 Destination Options RX processing by default Message-ID: <20260109115015.727c7e9e@kernel.org> In-Reply-To: <20260108171456.47519-1-tom@herbertland.com> References: <20260108171456.47519-1-tom@herbertland.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 8 Jan 2026 09:14:52 -0800 Tom Herbert wrote: > This patchset set changes the interpretation of the Destination Options > and Hop-by-Hop Options sysctl limits, net.ipv6.max_dst_opts_number and > net.ipv6.max_dst_opts_number to mean that when the sysctl is zero > processing of the associated extension header is disabled such that > packets received with the extension header are dropped. Hi Tom! Unfortunately, this breaks GRE: https://netdev.bots.linux.dev/contest.html?pw-n=0&branch=net-next-2026-01-09--18-00&pw-n=0&pass=0