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rtnetlink: pass link_net to the newlink handler

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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@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel 2015-01-27 11:13:08 +01:00 committed by David S. Miller
parent 86b3bfe914
commit 7b4ce694b2
1 changed files with 1 additions and 1 deletions
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2
net/core/rtnetlink.c
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@ -2148,7 +2148,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
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.