From patchwork Wed Jan 15 14:36:58 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Haller X-Patchwork-Id: 311161 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 1DC4E2C0082 for ; Thu, 16 Jan 2014 01:37:25 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751891AbaAOOhW (ORCPT ); Wed, 15 Jan 2014 09:37:22 -0500 Received: from mx1.redhat.com ([209.132.183.28]:64095 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751037AbaAOOhU (ORCPT ); Wed, 15 Jan 2014 09:37:20 -0500 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s0FEbFlD021182 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 15 Jan 2014 09:37:15 -0500 Received: from dhcp-25-241.brq.redhat.com ([10.34.249.213]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s0FEb9gh009439 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 15 Jan 2014 09:37:13 -0500 From: Thomas Haller To: David Miller Cc: hannes@stressinduktion.org, jiri@resnulli.us, netdev@vger.kernel.org, stephen@networkplumber.org, dcbw@redhat.com, Thomas Haller Subject: [PATCH v5 1/2] ipv6 addrconf: add IFA_F_NOPREFIXROUTE flag to suppress creation of IP6 routes Date: Wed, 15 Jan 2014 15:36:58 +0100 Message-Id: <1389796619-13440-2-git-send-email-thaller@redhat.com> In-Reply-To: <1389796619-13440-1-git-send-email-thaller@redhat.com> References: <20140110.181030.2081631538801450145.davem@davemloft.net> <1389796619-13440-1-git-send-email-thaller@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org When adding/modifying an IPv6 address, the userspace application needs a way to suppress adding a prefix route. This is for example relevant together with IFA_F_MANAGERTEMPADDR, where userspace creates autoconf generated addresses, but depending on on-link, no route for the prefix should be added. Signed-off-by: Thomas Haller --- include/uapi/linux/if_addr.h | 1 + net/ipv6/addrconf.c | 19 +++++++++++++------ 2 files changed, 14 insertions(+), 6 deletions(-) diff --git a/include/uapi/linux/if_addr.h b/include/uapi/linux/if_addr.h index cfed10b..dea10a8 100644 --- a/include/uapi/linux/if_addr.h +++ b/include/uapi/linux/if_addr.h @@ -49,6 +49,7 @@ enum { #define IFA_F_TENTATIVE 0x40 #define IFA_F_PERMANENT 0x80 #define IFA_F_MANAGETEMPADDR 0x100 +#define IFA_F_NOPREFIXROUTE 0x200 struct ifa_cacheinfo { __u32 ifa_prefered; diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 1b2e4ee..85100c1 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -2434,8 +2434,11 @@ static int inet6_addr_add(struct net *net, int ifindex, valid_lft, prefered_lft); if (!IS_ERR(ifp)) { - addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, - expires, flags); + if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { + addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, + expires, flags); + } + /* * Note that section 3.1 of RFC 4429 indicates * that the Optimistic flag should not be set for @@ -3662,7 +3665,8 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, spin_lock_bh(&ifp->lock); was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | - IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR); + IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | + IFA_F_NOPREFIXROUTE); ifp->flags |= ifa_flags; ifp->tstamp = jiffies; ifp->valid_lft = valid_lft; @@ -3672,8 +3676,10 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, if (!(ifp->flags&IFA_F_TENTATIVE)) ipv6_ifa_notify(0, ifp); - addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, - expires, flags); + if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { + addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, + expires, flags); + } if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) @@ -3727,7 +3733,8 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; /* We ignore other flags so far. */ - ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR; + ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | + IFA_F_NOPREFIXROUTE; ifa = ipv6_get_ifaddr(net, pfx, dev, 1); if (ifa == NULL) {