From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-1025811-1520488142-2-13024753592937248799 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='com', MailFrom='org', XOriginatingCountry='US' X-Spam-charsets: plain='iso-8859-1' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1520488141; b=vgj+1WmEZfORHv7QjxAMXpPOSXn32G3Wh/ymz0bZDfTvwbv mBVFqhL98SblV4ooj2cvCpve5FfXGGsxRF5t94kS75kHfp0tWMSf40PpN5AgMBPI kEzhQ9t8fLT21irVi8dP9H7J/vlX7GnQx8qPzmMJgHFob1ZNKnmj1DmYtBgMg9Yw g3vIRZHyx/t5wgzynryKTZ4eR6vAOVn9A1SHHjDKz2V3LyxRzSRnMBPdHzz9hLMu EYC356b7rbMuD4IqJTKCExkGpGdGPPbAG7TMJ2zTD2YQSmqpLtSVPnTybXVhftbm c8Fa9oAnR1uL6RbgWdnsQM7lLRFzsoCkj9i+OUw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :references:in-reply-to:content-type:content-transfer-encoding :mime-version:sender:list-id; s=arctest; t=1520488141; bh=Flq6nb l8ndIraMnZL9qw5DaRI0p5t3dSkxfDweNMlYo=; b=UBoeQ64asLLj8vgJvZlk8w PztZKZz7RLkF6Vc6ecan+CclsydMox9OpLTp4ybr3obs40VoPY8a2AJNBghqeP1u 7EHcxUWtMRhmDUrQl/su3s9DChMcuXoIUUCWwtfeJYT/L1Vx506jMwRRtjhkOIJ2 /cSKzjA//razFVfR7YWeOylLjbUeecT6SRkXbwqRRWwfUFkIYWZ4DRYoeAE5Y9fW wJSEUPW36vvhPLUKD/xPCaQWPWiHEe9ngmD+U6/d/jroqZ/A2JGqKzGLdE7MYR9Y NVB74IvJxxASoKRSxp4PYL/6drnwpXYCUFbOsToCPrsFosMqGHn53TRdcz029B5w == ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=pass (1024-bit rsa key sha256) header.d=microsoft.com header.i=@microsoft.com header.b=BJ3FDqFo x-bits=1024 x-keytype=rsa x-algorithm=sha256 x-selector=selector1; dmarc=pass (p=reject,has-list-id=yes,d=none) header.from=microsoft.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=pass (1024-bit rsa key sha256) header.d=microsoft.com header.i=@microsoft.com header.b=BJ3FDqFo x-bits=1024 x-keytype=rsa x-algorithm=sha256 x-selector=selector1; dmarc=pass (p=reject,has-list-id=yes,d=none) header.from=microsoft.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966305AbeCHFs5 (ORCPT ); Thu, 8 Mar 2018 00:48:57 -0500 Received: from mail-by2nam03on0127.outbound.protection.outlook.com ([104.47.42.127]:45712 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S935569AbeCHFFB (ORCPT ); Thu, 8 Mar 2018 00:05:01 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Alexey Kodanev , "David S . Miller" , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 183/190] ip6_vti: adjust vti mtu according to mtu of lower device Thread-Topic: [PATCH AUTOSEL for 4.9 183/190] ip6_vti: adjust vti mtu according to mtu of lower device Thread-Index: AQHTtppXccObetgXE0a5UeOJI1a1KA== Date: Thu, 8 Mar 2018 05:00:13 +0000 Message-ID: <20180308045810.8041-183-alexander.levin@microsoft.com> References: <20180308045810.8041-1-alexander.levin@microsoft.com> In-Reply-To: <20180308045810.8041-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0981;7:SnzH1V/sOdWyG6dI7mauWbaxK02EYq5go9DnHkU+yG0MctoUdzFQKJIlO5LchQUK7wLW8FninaDEBUiOVHkwpwaNR2QUhKj5FCngtcwBZnHTX+lbyxfpsejQLwlrbUXbESlVshwbQy2dQbeQK6GOpbLWAyByejR1uKa8NyZrhDfwxMnVR3Nio7MzrR+gl8QJTCnVqfu6pabceOifPyJfzkAVMU8UoCNhYQaATu4KDudEqTKsIVS7SFeVc201uDeh;20:2wRe9/X7fE6QfNpl3CCuFD4UhgcnwnRPSD/YzYstGzrWHK3otVSykeEf7w2O0v1jL7nlvQ4YS2o8y4wBWrtv+i4/SlqD9klfSQXRrlIC0HljKVcN35C/dXGDfW9xDE/TSOSzlUHRxEdViunD9ZNjAeb4d+9fOQSwElrjR+588Po= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: aba817fe-9ffe-4764-fd8b-08d584b2244c x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0981; x-ms-traffictypediagnostic: DM5PR2101MB0981: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(146099531331640); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040501)(2401047)(8121501046)(5005006)(93006095)(93001095)(3231220)(944501244)(52105095)(10201501046)(3002001)(6055026)(61426038)(61427038)(6041288)(20161123562045)(20161123558120)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123564045)(20161123560045)(6072148)(201708071742011);SRVR:DM5PR2101MB0981;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB0981; x-forefront-prvs: 060503E79B x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(39860400002)(39380400002)(396003)(366004)(346002)(376002)(199004)(189003)(305945005)(86612001)(2906002)(7736002)(6486002)(36756003)(54906003)(110136005)(6436002)(6666003)(2950100002)(10290500003)(316002)(186003)(22452003)(10090500001)(478600001)(105586002)(6512007)(53936002)(66066001)(68736007)(76176011)(102836004)(3280700002)(107886003)(25786009)(8936002)(59450400001)(106356001)(6506007)(5660300001)(3846002)(97736004)(14454004)(2501003)(26005)(5250100002)(4326008)(3660700001)(86362001)(6116002)(81166006)(99286004)(72206003)(2900100001)(1076002)(8676002)(81156014)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB0981;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;A:1;MX:1;LANG:en; x-microsoft-antispam-message-info: 5hx8Vy8Cxt1a5GOKJBiIoL9TIF4zVqcoM8Sq5ewGZvirB6JQEgQpdkVPIWoHMk6eUxoUqfNwanSWV0nSxns3uwhSz84hBtOoYw4f0t22/2kKwkOhwSXyYfypOfPsao7w5YLWB1p+WcYBtsJmsPH941srR8PLJMK8p8mQ0z+w25f4RZRMlkYOCi9R830AN0jtbfJnmpNbaqtR+uH8y5j0iPWrxoDwQaZpM2v6+fAZQs55LLo3JzYX85B87VVy9nkzwVZfax/YCD0M4Zj6GV9UJYKjouq0AuXEOh2qRznEQqpzg2H7wKqIqY27e4WzBszJc/x5LmTTYljlaUhzjmEuCg== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: aba817fe-9ffe-4764-fd8b-08d584b2244c X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Mar 2018 05:00:13.5800 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0981 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Alexey Kodanev [ Upstream commit 53c81e95df1793933f87748d36070a721f6cb287 ] LTP/udp6_ipsec_vti tests fail when sending large UDP datagrams over ip6_vti that require fragmentation and the underlying device has an MTU smaller than 1500 plus some extra space for headers. This happens because ip6_vti, by default, sets MTU to ETH_DATA_LEN and not updating it depending on a destination address or link parameter. Further attempts to send UDP packets may succeed because pmtu gets updated on ICMPV6_PKT_TOOBIG in vti6_err(). In case the lower device has larger MTU size, e.g. 9000, ip6_vti works but not using the possible maximum size, output packets have 1500 limit. The above cases require manual MTU setup after ip6_vti creation. However ip_vti already updates MTU based on lower device with ip_tunnel_bind_dev(). Here is the example when the lower device MTU is set to 9000: # ip a sh ltp_ns_veth2 ltp_ns_veth2@if7: mtu 9000 ... inet 10.0.0.2/24 scope global ltp_ns_veth2 inet6 fd00::2/64 scope global # ip li add vti6 type vti6 local fd00::2 remote fd00::1 # ip li show vti6 vti6@NONE: mtu 1500 ... link/tunnel6 fd00::2 peer fd00::1 After the patch: # ip li add vti6 type vti6 local fd00::2 remote fd00::1 # ip li show vti6 vti6@NONE: mtu 8832 ... link/tunnel6 fd00::2 peer fd00::1 Reported-by: Petr Vorel Signed-off-by: Alexey Kodanev Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/ipv6/ip6_vti.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c index 912333586de6..345efeb887ef 100644 --- a/net/ipv6/ip6_vti.c +++ b/net/ipv6/ip6_vti.c @@ -625,6 +625,7 @@ static void vti6_link_config(struct ip6_tnl *t) { struct net_device *dev =3D t->dev; struct __ip6_tnl_parm *p =3D &t->parms; + struct net_device *tdev =3D NULL; =20 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); @@ -637,6 +638,25 @@ static void vti6_link_config(struct ip6_tnl *t) dev->flags |=3D IFF_POINTOPOINT; else dev->flags &=3D ~IFF_POINTOPOINT; + + if (p->flags & IP6_TNL_F_CAP_XMIT) { + int strict =3D (ipv6_addr_type(&p->raddr) & + (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); + struct rt6_info *rt =3D rt6_lookup(t->net, + &p->raddr, &p->laddr, + p->link, strict); + + if (rt) + tdev =3D rt->dst.dev; + ip6_rt_put(rt); + } + + if (!tdev && p->link) + tdev =3D __dev_get_by_index(t->net, p->link); + + if (tdev) + dev->mtu =3D max_t(int, tdev->mtu - dev->hard_header_len, + IPV6_MIN_MTU); } =20 /** --=20 2.14.1