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=-7.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no 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 68945C2B9F4 for ; Fri, 25 Jun 2021 19:00:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 47FC361942 for ; Fri, 25 Jun 2021 19:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229812AbhFYTDT (ORCPT ); Fri, 25 Jun 2021 15:03:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33692 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229630AbhFYTDT (ORCPT ); Fri, 25 Jun 2021 15:03:19 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1B82FC061574 for ; Fri, 25 Jun 2021 12:00:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=GjEJOefBCEe+RF8GA0tru0Y742WwkzY2nbnFCp2Gb18=; b=ZtT1yEPPjB72tOmAd7ejOeb5Li xX/Qy1dUBOA+vQQ9vcAcf7/VvsjNIqUqBB2UuFq68If91CFqtKp7gKEoNj7rZHUil1DKQKmIrs//B hfdbmuO75qMOAcNeUnYBGuJrmfHyj1iBose+jv8bU4DORx0ez60Bw+m49ajMPyZzc8Y47ab5n/QbJ lqhboc6paMAHy7nwc0wAhLwsdCUUKhVH59SY8sT3W/5GzzNCewz4CkdAjxzH/2pz6DerYeVaMUNos iSQ/BLB47IBp29dtzZCKqYCrIJ4US0bZZdhmdk5CrBZ9v9oWanAs0CTvsz1l0hn3LanOUPglWMS+y zxp4Sdnw==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1lwr4T-002eBi-7l; Fri, 25 Jun 2021 19:00:57 +0000 Message-ID: <97fdd70554fd30d8e9d83051ddc9f820a5e45302.camel@infradead.org> Subject: Re: [PATCH v3 4/5] net: tun: fix tun_xdp_one() for IFF_TUN mode From: David Woodhouse To: Willem de Bruijn Cc: netdev@vger.kernel.org, Jason Wang , Eugenio =?ISO-8859-1?Q?P=E9rez?= Date: Fri, 25 Jun 2021 20:00:54 +0100 In-Reply-To: References: <03ee62602dd7b7101f78e0802249a6e2e4c10b7f.camel@infradead.org> <20210624123005.1301761-1-dwmw2@infradead.org> <20210624123005.1301761-4-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-yK4naBFwJ1T2xdyzxoRr" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --=-yK4naBFwJ1T2xdyzxoRr Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2021-06-25 at 14:43 -0400, Willem de Bruijn wrote: > On Thu, Jun 24, 2021 at 8:30 AM David Woodhouse wro= te: > >=20 > > From: David Woodhouse > >=20 > > In tun_get_user(), skb->protocol is either taken from the tun_pi header > > or inferred from the first byte of the packet in IFF_TUN mode, while > > eth_type_trans() is called only in the IFF_TAP mode where the payload > > is expected to be an Ethernet frame. > >=20 > > The equivalent code path in tun_xdp_one() was unconditionally using > > eth_type_trans(), which is the wrong thing to do in IFF_TUN mode and > > corrupts packets. > >=20 > > Pull the logic out to a separate tun_skb_set_protocol() function, and > > call it from both tun_get_user() and tun_xdp_one(). >=20 > I think this should be two patches. The support for parsing pi is an > independent fix. As things stand, this patch *doesn't* change the pskb_may_pull() behaviour. I think we should make that unconditional, and can indeed do so in a separate subsequent patch. --=-yK4naBFwJ1T2xdyzxoRr Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ 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