From patchwork Fri Feb 21 09:24:04 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guillaume Nault X-Patchwork-Id: 13985052 X-Patchwork-Delegate: kuba@kernel.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 870E0204C39 for ; Fri, 21 Feb 2025 09:24:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740129853; cv=none; b=FwYdAyTFSGQtZ7m2+okmPMuviWa7DeDg5nQtN2+XFgom9i2eLLmKEtr0VnXRynMy/A0BRV9GBeQRjTCHNr7M+VCqfq1SzaSb6aC6CzNEsZHgrMP9QLydI+GFfpneHIVMFT6+papOFGV+ioekMQdaaiDZJV/Q28ybkSCYFnfQexc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740129853; c=relaxed/simple; bh=cDLm2C1nI275N7W2/cLjmILIrNgL/CpWY5/XxEkE8XY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=tWlPPnjZ2GCrzqybJ9JwUNWRgX3/JTwarJSW6C5r1//oEfBcONoiJ8DKXyK0HbKJRzht/H1xhV9mS0IqTwTF3A/NTOzLXWQ3yMUgwB6QHATzalzgA9wFJs0UpluA1QqHZ2t66dS/MzyRX+2QNQG67eLn/rx9k1AgeZk3fat0La0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=fTOMpnbc; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="fTOMpnbc" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1740129850; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=JSRYm/qNQakanMxCvXY8bFyXAFzTvxkUv5zufFxOGKM=; b=fTOMpnbcOGkWH455I9dbKR5Txub3rB5GLCObenHdoBjkxWp5+nrs5hsqVMalzPap7mxDM2 LNagkDd9i9aBA4AdLaAEIt44nLMv8eLE9Rz6wu7E52s/ogwv6xaanTYYu3f5c9R4784kXG 7lps5bhI1GRVCGqdHHp2be4tM/EXJs4= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-486-OXNV2PJpORqlDVtd_TgdAA-1; Fri, 21 Feb 2025 04:24:08 -0500 X-MC-Unique: OXNV2PJpORqlDVtd_TgdAA-1 X-Mimecast-MFC-AGG-ID: OXNV2PJpORqlDVtd_TgdAA_1740129848 Received: by mail-wr1-f72.google.com with SMTP id ffacd0b85a97d-38f20b530dfso2727070f8f.3 for ; Fri, 21 Feb 2025 01:24:08 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1740129847; x=1740734647; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=JSRYm/qNQakanMxCvXY8bFyXAFzTvxkUv5zufFxOGKM=; b=FI6qZjpS0lG/pfihtD0lWbgIagOcMa3CTJzVHr2JixI0kAxNmnqsUc8KITgcU1Yoki VMxFX2vRxhoxqjKuxwAZPtr6wcx3CDCGQaPNaKqczuCoR0DGPArchfbgvnqNAiWaxiuS FWa/aj83nMDGNQaoiloxynxOIKjvDb2/N+GVfWqADvPyHN7Pzto3B/bfukyGgZZsdN+m CVitXTaYtoVtbxZ4ZjWUeoYSwy960xFJGyMHFeTdggugZcqgNzHLNp+RqdxeORs0XdcV hip7cCkNievZNhYv83/V12e5HXeJYV2rNn9tAsekj3ksAcYtEbMxPFqIw4zbcBFoXhkM H4fA== X-Gm-Message-State: AOJu0YxY7LzmSBrPP+LzGuuAQbMpE483VzKSQvA174QYU2Trl4QqWvU+ wYwNgL6sd/m+sD8wiVCDAXui1wcX4cdF1AlsKnlE+Oy9zmGwoDow0LpXvmr1ZVcaQkQ1SFX9yKV VLHse5G498oc0RFau8ls5hO0m2fnuYQudnuyOMxNa9r4RhCIDgrc1Ig== X-Gm-Gg: ASbGncskV7a+jSaoZ6/W6CG96IqhyC+BL0fkkQmsdydKtd2+OteDPEfqCad1VqKk+qi tePT2Q0J1dO8yzzqWjlg1VnwbbxRy/O5OsRtbp9zwuGv+gTJeltr3YPvX1/pd8xUKKuBEXZZA6I +o0p+bjL2uACjRBXYit7zf6OtpWTVp17E16lwbsOAbot99gTBQY4WkjlqpGV9F33dIbJFMlUwY8 RMOPQgLz06G5L9T5WAX+HBxjR72zJEE+0zLIljOUBVUxX9dP2iwgVrSpq8buCWWK0KgeLohlr/a tCI= X-Received: by 2002:a5d:6c6e:0:b0:38f:2a3e:870c with SMTP id ffacd0b85a97d-38f70799f23mr1580848f8f.16.1740129847422; Fri, 21 Feb 2025 01:24:07 -0800 (PST) X-Google-Smtp-Source: AGHT+IGW4kaKVY3wZyP2lhCcq49Y+JYuolRvoNf7ydAcLm/D2zsD9NGs/lmK4JDHenqQzAJBbq5Y7Q== X-Received: by 2002:a5d:6c6e:0:b0:38f:2a3e:870c with SMTP id ffacd0b85a97d-38f70799f23mr1580814f8f.16.1740129846976; Fri, 21 Feb 2025 01:24:06 -0800 (PST) Received: from debian ([2001:4649:f075:0:a45e:6b9:73fc:f9aa]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38f258b4491sm22462354f8f.7.2025.02.21.01.24.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Feb 2025 01:24:06 -0800 (PST) Date: Fri, 21 Feb 2025 10:24:04 +0100 From: Guillaume Nault To: David Miller , Jakub Kicinski , Paolo Abeni , Eric Dumazet Cc: netdev@vger.kernel.org, Simon Horman , David Ahern , Antonio Quartulli Subject: [PATCH net v2 1/2] gre: Fix IPv6 link-local address generation. Message-ID: <942aa62423e0d7721abd99a5ca1069f4e4901a6d.1740129498.git.gnault@redhat.com> References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Patchwork-Delegate: kuba@kernel.org Use addrconf_addr_gen() to generate IPv6 link-local addresses on GRE devices in most cases and fall back to using add_v4_addrs() only in case the GRE configuration is incompatible with addrconf_addr_gen(). GRE used to use addrconf_addr_gen() until commit e5dd729460ca ("ip/ip6_gre: use the same logic as SIT interfaces when computing v6LL address") restricted this use to gretap devices and created add_v4_addrs() (borrowed from SIT) for non-Ethernet GRE ones. The original problem came when commit 9af28511be10 ("addrconf: refuse isatap eui64 for INADDR_ANY") made __ipv6_isatap_ifid() fail when its addr parameter was 0. The commit says that this would create an invalid address, however, I couldn't find any RFC saying that the generated interface identifier would be wrong. Anyway, since plain gre devices pass their local tunnel address to __ipv6_isatap_ifid(), that commit broke their IPv6 link-local address generation when the local address was unspecified. Then commit e5dd729460ca ("ip/ip6_gre: use the same logic as SIT interfaces when computing v6LL address") tried to fix that case by defining add_v4_addrs() and calling it to generated the IPv6 link-local address instead of using addrconf_addr_gen() (appart for gretap devices which would still use the regular addrconf_addr_gen(), since they have a MAC address). That broke several use cases because add_v4_addrs() isn't properly integrated into the rest of IPv6 Neighbor Discovery code. Several of these shortcomings have been fixed over time, but add_v4_addrs() remains broken on several aspects. In particular, it doesn't send any Router Sollicitations, so the SLAAC process doesn't start until the interface receives a Router Advertisement. Also, add_v4_addrs() mostly ignores the address generation mode of the interface (/proc/sys/net/ipv6/conf/*/addr_gen_mode), thus breaking the IN6_ADDR_GEN_MODE_RANDOM and IN6_ADDR_GEN_MODE_STABLE_PRIVACY cases. Fix all this by reverting to addrconf_addr_gen() in all cases but the very specific one that remains incompatible. Fix the situation by using add_v4_addrs() only in the specific scenario where normal method would fail. That is, for interfaces that have all of the following characteristics: * transport IP packets directly, not Ethernet (that is, not gretap), * run over IPv4, * tunnel endpoint is INADDR_ANY (that is, 0), * device address generation mode is EUI64. In all other cases, revert back to the regular addrconf_addr_gen(). Also, remove the special case for ip6gre interfaces in add_v4_addrs(), since ip6gre devices now always use addrconf_addr_gen() instead. Fixes: e5dd729460ca ("ip/ip6_gre: use the same logic as SIT interfaces when computing v6LL address") Signed-off-by: Guillaume Nault --- net/ipv6/addrconf.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index ac8cc1076536..8b6258819dad 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -3209,16 +3209,13 @@ static void add_v4_addrs(struct inet6_dev *idev) struct in6_addr addr; struct net_device *dev; struct net *net = dev_net(idev->dev); - int scope, plen, offset = 0; + int scope, plen; u32 pflags = 0; ASSERT_RTNL(); memset(&addr, 0, sizeof(struct in6_addr)); - /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ - if (idev->dev->addr_len == sizeof(struct in6_addr)) - offset = sizeof(struct in6_addr) - 4; - memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); + memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { scope = IPV6_ADDR_COMPATv4; @@ -3529,7 +3526,13 @@ static void addrconf_gre_config(struct net_device *dev) return; } - if (dev->type == ARPHRD_ETHER) { + /* Generate the IPv6 link-local address using addrconf_addr_gen(), + * unless we have an IPv4 GRE device not bound to an IP address and + * which is in EUI64 mode (as __ipv6_isatap_ifid() would fail in this + * case). Such devices fall back to add_v4_addrs() instead. + */ + if (!(dev->type == ARPHRD_IPGRE && *(__be32 *)dev->dev_addr == 0 && + idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)) { addrconf_addr_gen(idev, true); return; } From patchwork Fri Feb 21 09:24:10 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guillaume Nault X-Patchwork-Id: 13985053 X-Patchwork-Delegate: kuba@kernel.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 07F931FAC46 for ; Fri, 21 Feb 2025 09:24:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740129861; cv=none; b=lwsRHKpvJaDbDSgB5HLhdqliIDP0y/7eeaTr8XiiJb1yfZ2KunOdeaBQ+V+5Czrp8L5X9xfnM/VBI/j35PBUHZUAPgvCVC8HxE5H+gjII82Tihek5JjnjExl8dpwm87p2Sy9fJq/ZklX1Rs1X9T9BEvm6q/M2n11g4Q7xpGai6I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740129861; c=relaxed/simple; bh=dC5tE7ag9gaxET1RhZIhWjH9+upcBjfxktyxOGFZ4xE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=I9sLM+kRoCk/hIi1HY26iL62izPS0tyIayWcygBe+BSqOSTxC+0xffY8l1poUXfbwlaFvUzekQ5Xc3mgupQgUhAi7W+G+HtV7vfPonVqbi1JDVxHCmtlUagv6knV4fQmtSKFHMRU74PHxKzFbw+dMj5sm7EQZnh7gOBXu6FMJEc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=gAMlyV0h; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gAMlyV0h" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1740129859; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=kifSX+031tKwuktoajViO9/mvxv4MOw+Oe1xNioyW+U=; b=gAMlyV0hNpY/DM8H5VUIVEH5iOsSgXVUU/XMm3DileDQREDyFgqBCJ581RGrCH1JlHYXWy LUw/UYFyUsoPXYp7ruZPP0nEt7VH6Dm0K0Icg0t64bUuCSzbLvta+PxQGWa4YwQ21aiRoW ylmHkeN4QJyQ+oUODm3IjG9yVXW58aU= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-370-xqjipo2iMWa6Kps5Qtj_gw-1; Fri, 21 Feb 2025 04:24:17 -0500 X-MC-Unique: xqjipo2iMWa6Kps5Qtj_gw-1 X-Mimecast-MFC-AGG-ID: xqjipo2iMWa6Kps5Qtj_gw_1740129856 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-4393e873962so9383455e9.3 for ; Fri, 21 Feb 2025 01:24:17 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1740129856; x=1740734656; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=kifSX+031tKwuktoajViO9/mvxv4MOw+Oe1xNioyW+U=; b=LW3fzWSp0rNk0wyQimJYMttLvTI/ZYu11ajbdJoC0e41PzPrMRB8D6MobaEFALLdMO jEc8o8tVzFFZ33S779k7LyWxryrtGr8f64Ls3rHJxj+9bkRNEMfl5HBOUDC+DMkTGbgx fk/kb5vljMZgUKcJ4b36LeIrxHGaSwMDm0zwPzRTCLlZToqqkSIQMd8eO91hS7iNAy/A buE6TiMVu4BKCoVvKjww4/5KSxj/GgA0i8oJ3Lf0+Zed3DPXD/cjROTMuKkPXlfp65Hp FdwDVMj1TDFFiPGIFiIK0pyHlmecIXuAmXDpUhLXA0zT0NRdmkxnU9I2nJ8sA9cBmBgW 9cvw== X-Gm-Message-State: AOJu0Yy2bkSglKt02oBuAHZb3WgWx1BfkHWjUaKblhlk2SdmvBDyS1rb m9Yqm0JsOSBM1yYGuTtJNox1kSHTuGeX6XxqCkK+lqyzkVvgMFs27twT/6WOUxYIFQ/pvIaOU3W /6HTtouwpgfqS+q21EvmExtdYHvk5KPHHn5iZeghknHYghwbd1IyRVg== X-Gm-Gg: ASbGncuGOH2zuGr9nn2P+Qx75EsXoy0VnFcwKYrdQQMc8HTxnx7kw+uYuNDsbZD+n4v SKTlvpTopKw0nbivjLuJgA4ieodTIjPwD1kLhDe60F9MH0k6oRhVVE1eZsWZwCAIfvsxz9bnR+h o2WTnFYK2Xj4Se4MGo4FlRGLcfdi/ndsvF66N7OdU6HUyq1dwB0HlyVqHvyd4UGX+YHy1aUijBs euKLol/A06P2icpD1y3bfrxcsSB+eBjToiV2XJsM4bKoRBGOvb9XABZTjMbqiRM5+jvWaxyuxCp lkU= X-Received: by 2002:a05:600c:45c6:b0:439:84ba:5773 with SMTP id 5b1f17b1804b1-439ae225a44mr18925455e9.31.1740129855740; Fri, 21 Feb 2025 01:24:15 -0800 (PST) X-Google-Smtp-Source: AGHT+IFyQ4tqbJw1dzcfjYSv6AayXk/oJzgWrRboon7xzCcbaFVb9NhIjmbKpGDUR+e8Pq/+JfZpcg== X-Received: by 2002:a05:600c:45c6:b0:439:84ba:5773 with SMTP id 5b1f17b1804b1-439ae225a44mr18924035e9.31.1740129853695; Fri, 21 Feb 2025 01:24:13 -0800 (PST) Received: from debian ([2001:4649:f075:0:a45e:6b9:73fc:f9aa]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-439b02f5b38sm11391315e9.24.2025.02.21.01.24.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Feb 2025 01:24:13 -0800 (PST) Date: Fri, 21 Feb 2025 10:24:10 +0100 From: Guillaume Nault To: David Miller , Jakub Kicinski , Paolo Abeni , Eric Dumazet Cc: netdev@vger.kernel.org, Simon Horman , David Ahern , Antonio Quartulli Subject: [PATCH net v2 2/2] selftests: Add IPv6 link-local address generation tests for GRE devices. Message-ID: <5c40747f9c67a54f8ceba9478924a75755c42b07.1740129498.git.gnault@redhat.com> References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Patchwork-Delegate: kuba@kernel.org GRE devices have their special code for IPv6 link-local address generation that has been the source of several regressions in the past. Add selftest to check that all gre, ip6gre, gretap and ip6gretap get an IPv6 link-link local address in accordance with the net.ipv6.conf..addr_gen_mode sysctl. Signed-off-by: Guillaume Nault --- v2: Add selftest to Makefile. tools/testing/selftests/net/Makefile | 1 + .../testing/selftests/net/gre_ipv6_lladdr.sh | 227 ++++++++++++++++++ 2 files changed, 228 insertions(+) create mode 100755 tools/testing/selftests/net/gre_ipv6_lladdr.sh diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 73ee88d6b043..5916f3b81c39 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -31,6 +31,7 @@ TEST_PROGS += veth.sh TEST_PROGS += ioam6.sh TEST_PROGS += gro.sh TEST_PROGS += gre_gso.sh +TEST_PROGS += gre_ipv6_lladdr.sh TEST_PROGS += cmsg_so_mark.sh TEST_PROGS += cmsg_so_priority.sh TEST_PROGS += cmsg_time.sh cmsg_ipv6.sh diff --git a/tools/testing/selftests/net/gre_ipv6_lladdr.sh b/tools/testing/selftests/net/gre_ipv6_lladdr.sh new file mode 100755 index 000000000000..85e40b6df55e --- /dev/null +++ b/tools/testing/selftests/net/gre_ipv6_lladdr.sh @@ -0,0 +1,227 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +ERR=4 # Return 4 by default, which is the SKIP code for kselftest +PAUSE_ON_FAIL="no" + +readonly NS0=$(mktemp -u ns0-XXXXXXXX) + +# Exit the script after having removed the network namespaces it created +# +# Parameters: +# +# * The list of network namespaces to delete before exiting. +# +exit_cleanup() +{ + for ns in "$@"; do + ip netns delete "${ns}" 2>/dev/null || true + done + + if [ "${ERR}" -eq 4 ]; then + echo "Error: Setting up the testing environment failed." >&2 + fi + + exit "${ERR}" +} + +# Create the network namespaces used by the script (NS0) +# +create_namespaces() +{ + ip netns add "${NS0}" || exit_cleanup +} + +# The trap function handler +# +exit_cleanup_all() +{ + exit_cleanup "${NS0}" +} + +# Add fake IPv4 and IPv6 networks on the loopback device, to be used as +# underlay by future GRE devices. +# +setup_basenet() +{ + ip -netns "${NS0}" link set dev lo up + ip -netns "${NS0}" address add dev lo 192.0.2.10/24 + ip -netns "${NS0}" address add dev lo 2001:db8::10/64 nodad +} + +# Check if network device has an IPv6 link-local address assigned. +# +# Parameters: +# +# * $1: The network device to test +# * $2: An extra regular expression that should be matched (to verify the +# presence of extra attributes) +# * $3: The expected return code from grep (to allow checking the abscence of +# a link-local address) +# * $4: The user visible name for the scenario being tested +# +check_ipv6_ll_addr() +{ + local DEV="$1" + local EXTRA_MATCH="$2" + local XRET="$3" + local MSG="$4" + local RET + + printf "%-75s " "${MSG}" + + set +e + ip -netns "${NS0}" -6 address show dev "${DEV}" scope link | grep "fe80::" | grep -q "${EXTRA_MATCH}" + RET=$? + set -e + + if [ "${RET}" -eq "${XRET}" ]; then + printf "[ OK ]\n" + else + ERR=1 + printf "[FAIL]\n" + if [ "${PAUSE_ON_FAIL}" = "yes" ]; then + printf "\nHit enter to continue, 'q' to quit\n" + read -r a + if [ "$a" = "q" ]; then + exit 1 + fi + fi + fi +} + + +# Create a GRE device and verify that it gets an IPv6 link-local address as +# expected. +# +# Parameters: +# +# * $1: The device type (gre, ip6gre, gretap or ip6gretap) +# * $2: The local underlay IP address (can be an IPv4, an IPv6 or "any") +# * $3: The remote underlay IP address (can be an IPv4, an IPv6 or "any") +# * $4: The IPv6 interface identifier generation mode to use for the GRE +# device (eui64, none, stable-privacy or random). +# +test_gre_device() +{ + local GRE_TYPE="$1" + local LOCAL_IP="$2" + local REMOTE_IP="$3" + local MODE="$4" + local ADDR_GEN_MODE + local MATCH_REGEXP + local MSG + + ip link add netns "${NS0}" name gretest type "${GRE_TYPE}" local "${LOCAL_IP}" remote "${REMOTE_IP}" + + case "${MODE}" in + "eui64") + ADDR_GEN_MODE=0 + MATCH_REGEXP="" + MSG="${GRE_TYPE}, mode: 0 (EUI64), ${LOCAL_IP} -> ${REMOTE_IP}" + XRET=0 + ;; + "none") + ADDR_GEN_MODE=1 + MATCH_REGEXP="" + MSG="${GRE_TYPE}, mode: 1 (none), ${LOCAL_IP} -> ${REMOTE_IP}" + XRET=1 # No link-local address should be generated + ;; + "stable-privacy") + ADDR_GEN_MODE=2 + MATCH_REGEXP="stable-privacy" + MSG="${GRE_TYPE}, mode: 2 (stable privacy), ${LOCAL_IP} -> ${REMOTE_IP}" + XRET=0 + # Initialise stable_secret (required for stable-privacy mode) + ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.stable_secret="2001:db8::abcd" + ;; + "random") + ADDR_GEN_MODE=3 + MATCH_REGEXP="stable-privacy" + MSG="${GRE_TYPE}, mode: 3 (random), ${LOCAL_IP} -> ${REMOTE_IP}" + XRET=0 + ;; + esac + + # Check that IPv6 link-local address is generated when device goes up + ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.addr_gen_mode="${ADDR_GEN_MODE}" + ip -netns "${NS0}" link set dev gretest up + check_ipv6_ll_addr gretest "${MATCH_REGEXP}" "${XRET}" "config: ${MSG}" + + # Now disable link-local address generation + ip -netns "${NS0}" link set dev gretest down + ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.addr_gen_mode=1 + ip -netns "${NS0}" link set dev gretest up + + # Check that link-local address generation works when re-enabled while + # the device is already up + ip netns exec "${NS0}" sysctl -qw net.ipv6.conf.gretest.addr_gen_mode="${ADDR_GEN_MODE}" + check_ipv6_ll_addr gretest "${MATCH_REGEXP}" "${XRET}" "update: ${MSG}" + + ip -netns "${NS0}" link del dev gretest +} + +test_gre4() +{ + local GRE_TYPE + local MODE + + for GRE_TYPE in "gre" "gretap"; do + printf "\n####\nTesting IPv6 link-local address generation on ${GRE_TYPE} devices\n####\n\n" + + for MODE in "eui64" "none" "stable-privacy" "random"; do + test_gre_device "${GRE_TYPE}" 192.0.2.10 192.0.2.11 "${MODE}" + test_gre_device "${GRE_TYPE}" any 192.0.2.11 "${MODE}" + test_gre_device "${GRE_TYPE}" 192.0.2.10 any "${MODE}" + done + done +} + +test_gre6() +{ + local GRE_TYPE + local MODE + + for GRE_TYPE in "ip6gre" "ip6gretap"; do + printf "\n####\nTesting IPv6 link-local address generation on ${GRE_TYPE} devices\n####\n\n" + + for MODE in "eui64" "none" "stable-privacy" "random"; do + test_gre_device "${GRE_TYPE}" 2001:db8::10 2001:db8::11 "${MODE}" + test_gre_device "${GRE_TYPE}" any 2001:db8::11 "${MODE}" + test_gre_device "${GRE_TYPE}" 2001:db8::10 any "${MODE}" + done + done +} + +usage() +{ + echo "Usage: $0 [-p]" + exit 1 +} + +while getopts :p o +do + case $o in + p) PAUSE_ON_FAIL="yes";; + *) usage;; + esac +done + +# Create namespaces before setting up the exit trap. +# Otherwise, exit_cleanup_all() could delete namespaces that were not created +# by this script. +create_namespaces + +set -e +trap exit_cleanup_all EXIT + +setup_basenet + +test_gre4 +test_gre6 + +if [ "${ERR}" -eq 1 ]; then + echo "Some tests failed." >&2 +else + ERR=0 +fi