From: Jiri Pirko <jiri@resnulli.us>
To: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Cc: davem@davemloft.net, netdev@vger.kernel.org,
j.vosburgh@gmail.com, vfalico@gmail.com,
gospo@cumulusnetworks.com
Subject: Re: [PATCH net v4] rtnl/bond: don't send rtnl msg for unregistered iface
Date: Wed, 13 May 2015 14:24:18 +0200 [thread overview]
Message-ID: <20150513122418.GA2138@nanopsycho.mtl.com> (raw)
In-Reply-To: <1431519582-4219-1-git-send-email-nicolas.dichtel@6wind.com>
Wed, May 13, 2015 at 02:19:42PM CEST, nicolas.dichtel@6wind.com wrote:
>Before the patch, the command 'ip link add bond2 type bond mode 802.3ad'
>causes the kernel to send a rtnl message for the bond2 interface, with an
>ifindex 0.
>
>'ip monitor' shows:
>0: bond2: <BROADCAST,MULTICAST,MASTER> mtu 1500 state DOWN group default
> link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
>9: bond2@NONE: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN group default
> link/ether ea:3e:1f:53:92:7b brd ff:ff:ff:ff:ff:ff
>[snip]
>
>The patch fixes the spotted bug by checking in bond driver if the interface
>is registered before calling the notifier chain.
>It also adds a check in rtmsg_ifinfo() to prevent this kind of bug in the
>future.
>
>Fixes: d4261e565000 ("bonding: create netlink event when bonding option is changed")
>CC: Jiri Pirko <jiri@resnulli.us>
>Reported-by: Julien Meunier <julien.meunier@6wind.com>
>Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
>---
>
>v4: keep the call to the notifier chain
>
>v3: move reg_state check in rtmsg_ifinfo()
>
>v2: check dev->reg_state instead of ifindex
> call rtmsg_ifinfo() directly in __bond_opt_set()
>
>There is about 20 occurences of "dev->reg_state .= NETREG_REGISTERED".
>I will send a patch on net-next to introduce an helper for this when net
>will be merged with this patch in net-next.
>
> drivers/net/bonding/bond_options.c | 2 +-
> net/core/rtnetlink.c | 3 +++
> 2 files changed, 4 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
>index 4df28943d222..e8d3c1d35453 100644
>--- a/drivers/net/bonding/bond_options.c
>+++ b/drivers/net/bonding/bond_options.c
>@@ -624,7 +624,7 @@ int __bond_opt_set(struct bonding *bond,
> out:
> if (ret)
> bond_opt_error_interpret(bond, opt, ret, val);
>- else
>+ else if (bond->dev->reg_state == NETREG_REGISTERED)
> call_netdevice_notifiers(NETDEV_CHANGEINFODATA, bond->dev);
>
> return ret;
>diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
>index 837d30b5ffed..7b25f1ef3d75 100644
>--- a/net/core/rtnetlink.c
>+++ b/net/core/rtnetlink.c
>@@ -2415,6 +2415,9 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
> {
> struct sk_buff *skb;
>
>+ if (dev->reg_state != NETREG_REGISTERED)
>+ return;
>+
This is redundant now that you check it in __bond_opt_set.
Sorry to be a pain Nicolas :/
next prev parent reply other threads:[~2015-05-13 12:24 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-11 14:25 [PATCH net] rtnl: don't send rtnl msg for unregistered iface Nicolas Dichtel
2015-05-11 15:37 ` Jiri Pirko
2015-05-11 16:04 ` Nicolas Dichtel
2015-05-11 16:15 ` Nicolas Dichtel
2015-05-11 17:53 ` Jiri Pirko
2015-05-11 22:15 ` Andy Gospodarek
2015-05-12 8:43 ` Nicolas Dichtel
2015-05-12 15:03 ` [PATCH net v2] rtnl/bond: " Nicolas Dichtel
2015-05-12 15:06 ` Nicolas Dichtel
2015-05-12 15:17 ` [PATCH net v3] " Nicolas Dichtel
2015-05-12 15:58 ` Jiri Pirko
2015-05-12 16:10 ` Nicolas Dichtel
2015-05-12 16:14 ` Jiri Pirko
2015-05-13 12:19 ` [PATCH net v4] " Nicolas Dichtel
2015-05-13 12:24 ` Jiri Pirko [this message]
2015-05-13 12:36 ` Nicolas Dichtel
2015-05-18 2:44 ` David Miller
2015-07-13 14:11 ` Kristian Evensen
2015-07-15 15:07 ` Nicolas Dichtel
2015-07-16 9:06 ` Nicolas Dichtel
2015-07-16 9:31 ` [PATCH linux-3.18.y] rtnl: restore notifications for deleted interfaces Nicolas Dichtel
2015-05-12 17:12 ` [PATCH net v3] rtnl/bond: don't send rtnl msg for unregistered iface Andy Gospodarek
2015-05-13 12:01 ` Nicolas Dichtel
2015-05-13 14:43 ` Andy Gospodarek
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