netdev - [PATCH net-next v2] rtnetlink: pass link

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Message-Id: <1422353588-4830-1-git-send-email-nicolas.dichtel@6wind.com>
Date:	Tue, 27 Jan 2015 11:13:08 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH net-next v2] rtnetlink: pass link_net to the newlink handler

When IFLA_LINK_NETNSID is used, the netdevice should be built in this link netns
and moved at the end to another netns (pointed by the socket netns or
IFLA_NET_NS_[PID|FD]).

Existing user of the newlink handler will use the netns argument (src_net) to
find a link netdevice or to check some other information into the link netns.
For example, to find a netdevice, two information are required: an ifindex
(usually from IFLA_LINK) and a netns (this link netns).

Note: when using IFLA_LINK_NETNSID and IFLA_NET_NS_[PID|FD], a user may create a
netdevice that stands in netnsX and with its link part in netnsY, by sending a
rtnl message from netnsZ.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---

v2: instead of patching each subsystem, pass the right netns to
    the newlink handler

 net/core/rtnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 07447d1665e6..fedd7ab4085a 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2148,7 +2148,7 @@ replay:
 		dev->ifindex = ifm->ifi_index;

 		if (ops->newlink) {
-			err = ops->newlink(net, dev, tb, data);
+			err = ops->newlink(link_net ? : net, dev, tb, data);
 			/* Drivers should call free_netdev() in ->destructor
 			 * and unregister it on failure after registration
 			 * so that device could be finally freed in rtnl_unlock.
-- 
2.2.2

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