From owner-freebsd-bugs@FreeBSD.ORG Tue Feb 17 04:40:20 2004 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A2ACC16A4CE for ; Tue, 17 Feb 2004 04:40:20 -0800 (PST) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7F65A43D1F for ; Tue, 17 Feb 2004 04:40:20 -0800 (PST) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) i1HCeKbv002450 for ; Tue, 17 Feb 2004 04:40:20 -0800 (PST) (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.12.10/8.12.10/Submit) id i1HCeKRU002449; Tue, 17 Feb 2004 04:40:20 -0800 (PST) (envelope-from gnats) Resent-Date: Tue, 17 Feb 2004 04:40:20 -0800 (PST) Resent-Message-Id: <200402171240.i1HCeKRU002449@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Alexander Motin Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3511916A4CE for ; Tue, 17 Feb 2004 04:36:08 -0800 (PST) Received: from www.freebsd.org (www.freebsd.org [216.136.204.117]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3125343D1D for ; Tue, 17 Feb 2004 04:36:08 -0800 (PST) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.12.10/8.12.10) with ESMTP id i1HCa772054113 for ; Tue, 17 Feb 2004 04:36:07 -0800 (PST) (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.12.10/8.12.10/Submit) id i1HCa7p2054112; Tue, 17 Feb 2004 04:36:07 -0800 (PST) (envelope-from nobody) Message-Id: <200402171236.i1HCa7p2054112@www.freebsd.org> Date: Tue, 17 Feb 2004 04:36:07 -0800 (PST) From: Alexander Motin To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-2.3 Subject: kern/62957: When created dummynet pipe on output router interface with lower MTU system stops to generate 'Fragment Needed but DF was Set' ICMP in cases when it must X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Feb 2004 12:40:20 -0000 >Number: 62957 >Category: kern >Synopsis: When created dummynet pipe on output router interface with lower MTU system stops to generate 'Fragment Needed but DF was Set' ICMP in cases when it must >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Feb 17 04:40:20 PST 2004 >Closed-Date: >Last-Modified: >Originator: Alexander Motin >Release: 4.8 and 5.2 >Organization: Alkar-Teleport ISP >Environment: FreeBSD ghsdr3-dp.alkar.net 4.8-RELEASE FreeBSD 4.8-RELEASE #2: Thu Oct 2 18:36:09 EEST 2003 povar@ghsdr3-dp.alkar.net:/usr/src/sys/compile/GHSDR2-DP i386 FreeBSD orphanage.alkar.net 5.2-RELEASE FreeBSD 5.2-RELEASE #0: Wed Jan 14 04:41:35 EET 2004 mav@orphanage.alkar.net:/usr/obj/usr/src/sys/orphanage i386 >Description: When I create dummynet pipe on output router interface with lower MTU system stops to generate 'Fragment Needed but DF was Set' ICMP in cases when it must. If I create this pipe on incoming interface there is no problem. >How-To-Repeat: Take router with 2 interfaces and small MTU on one of them. Create output dummynet pipe on interface with small MTU. Send big packet with DF flag set. >Fix: Check result code of ip_output() in ip_dummynet.c and send requires ICMP message. Here is no any check of result code: case DN_TO_IP_OUT: (void)ip_output((struct mbuf *)pkt, NULL, NULL, 0, NULL, NULL); rt_unref (pkt->ro.ro_rt, __func__) ; break ; >Release-Note: >Audit-Trail: >Unformatted: