From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757417Ab3FMHGx (ORCPT ); Thu, 13 Jun 2013 03:06:53 -0400 Received: from mx1.redhat.com ([209.132.183.28]:32847 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750762Ab3FMHGw (ORCPT ); Thu, 13 Jun 2013 03:06:52 -0400 Date: Thu, 13 Jun 2013 10:07:29 +0300 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: "David S. Miller" , John Fastabend , Patrick McHardy , netdev@vger.kernel.org Subject: [PATCH v2] macvlan: don't touch promisc without passthrough Message-ID: <1371107001-10250-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Mutt-Fcc: =sent Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org commit df8ef8f3aaa6692970a436204c4429210addb23a "macvlan: add FDB bridge ops and macvlan flags" added a way to control NOPROMISC macvlan flag through netlink. However, with a non passthrough device we never set promisc on open, even if NOPROMISC is off. As a result: If userspace clears NOPROMISC on open, then does not clear it on a netlink command, promisc counter is not decremented on stop and there will be no way to clear it once macvlan is detached. If userspace does not clear NOPROMISC on open, then sets NOPROMISC on a netlink command, promisc counter will be decremented from 0 and overflow to fffffffff with no way to clear promisc. To fix, simply ignore NOPROMISC flag in a netlink command for non-passthrough devices, same as we do at open/close. Since we touch this code anyway - check dev_set_promiscuity return code and pass it to users (though an error here is unlikely). Cc: "David S. Miller" Reviewed-by: John Fastabend Signed-off-by: Michael S. Tsirkin --- Changes from v1: minor style changes suggested by Sergei Shtylyov drivers/net/macvlan.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 1c502bb..6e91931 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -853,18 +853,24 @@ static int macvlan_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { struct macvlan_dev *vlan = netdev_priv(dev); - if (data && data[IFLA_MACVLAN_MODE]) - vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); + if (data && data[IFLA_MACVLAN_FLAGS]) { __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; - - if (promisc && (flags & MACVLAN_FLAG_NOPROMISC)) - dev_set_promiscuity(vlan->lowerdev, -1); - else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC)) - dev_set_promiscuity(vlan->lowerdev, 1); + if (vlan->port->passthru && promisc) { + int err; + + if (flags & MACVLAN_FLAG_NOPROMISC) + err = dev_set_promiscuity(vlan->lowerdev, -1); + else + err = dev_set_promiscuity(vlan->lowerdev, 1); + if (err < 0) + return err; + } vlan->flags = flags; } + if (data && data[IFLA_MACVLAN_MODE]) + vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); return 0; } -- MST