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batman-adv: Handle parent interfaces in a different netns 

batman-adv tries to prevent the user from placing a batX soft
interface into another batman mesh as a hard interface. It does this
by walking up the devices list of parents and ensures they are all
none batX interfaces. iflink can point to an interface in a different
namespace, so also retrieve the parents name space when finding the
parent and use it when doing the comparison.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
[sven@narfation.org: Fix alignments, simplify parent netns retrieval]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
This commit is contained in:
Andrew Lunn 2016-07-03 13:31:33 +02:00 committed by Simon Wunderlich
parent b5dcbad252
commit 275019d2f0
1 changed files with 43 additions and 7 deletions
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50
net/batman-adv/hard-interface.c
View File

@ -35,6 +35,8 @@
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/net_namespace.h>
#include <net/rtnetlink.h>
#include "bat_v.h"
#include "bridge_loop_avoidance.h"
@ -83,26 +85,56 @@ out:
return hard_iface;
}
/**
* batadv_getlink_net - return link net namespace (of use fallback)
* @netdev: net_device to check
* @fallback_net: return in case get_link_net is not available for @netdev
*
* Return: result of rtnl_link_ops->get_link_net or @fallback_net
*/
static const struct net *batadv_getlink_net(const struct net_device *netdev,
const struct net *fallback_net)
{
if (!netdev->rtnl_link_ops)
return fallback_net;
if (!netdev->rtnl_link_ops->get_link_net)
return fallback_net;
return netdev->rtnl_link_ops->get_link_net(netdev);
}
/**
* batadv_mutual_parents - check if two devices are each others parent
* @dev1: 1st net_device
* @dev2: 2nd net_device
* @dev1: 1st net dev
* @net1: 1st devices netns
* @dev2: 2nd net dev
* @net2: 2nd devices netns
*
* veth devices come in pairs and each is the parent of the other!
*
* Return: true if the devices are each others parent, otherwise false
*/
static bool batadv_mutual_parents(const struct net_device *dev1,
const struct net_device *dev2)
const struct net *net1,
const struct net_device *dev2,
const struct net *net2)
{
int dev1_parent_iflink = dev_get_iflink(dev1);
int dev2_parent_iflink = dev_get_iflink(dev2);
const struct net *dev1_parent_net;
const struct net *dev2_parent_net;
dev1_parent_net = batadv_getlink_net(dev1, net1);
dev2_parent_net = batadv_getlink_net(dev2, net2);
if (!dev1_parent_iflink || !dev2_parent_iflink)
return false;
return (dev1_parent_iflink == dev2->ifindex) &&
(dev2_parent_iflink == dev1->ifindex);
(dev2_parent_iflink == dev1->ifindex) &&
net_eq(dev1_parent_net, net2) &&
net_eq(dev2_parent_net, net1);
}
/**
@ -120,8 +152,9 @@ static bool batadv_mutual_parents(const struct net_device *dev1,
*/
static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
{
struct net_device *parent_dev;
struct net *net = dev_net(net_dev);
struct net_device *parent_dev;
const struct net *parent_net;
bool ret;
/* check if this is a batman-adv mesh interface */
@ -133,13 +166,16 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
dev_get_iflink(net_dev) == net_dev->ifindex)
return false;
parent_net = batadv_getlink_net(net_dev, net);
/* recurse over the parent device */
parent_dev = __dev_get_by_index(net, dev_get_iflink(net_dev));
parent_dev = __dev_get_by_index((struct net *)parent_net,
dev_get_iflink(net_dev));
/* if we got a NULL parent_dev there is something broken.. */
if (WARN(!parent_dev, "Cannot find parent device"))
return false;
if (batadv_mutual_parents(net_dev, parent_dev))
if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net))
return false;
ret = batadv_is_on_batman_iface(parent_dev);