[B.A.T.M.A.N.] [PATCHv2 3/4] 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(a)lunn.ch> Acked-by: Antonio Quartulli <a(a)untable.cc> --- net/batman-adv/hard-interface.c | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index b28eacc..51e9e68 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -85,24 +85,37 @@ out: /** * 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 = net1; + const struct net *dev2_parent_net = net2; + + if (dev1->rtnl_link_ops && dev1->rtnl_link_ops->get_link_net) + dev1_parent_net = dev1->rtnl_link_ops->get_link_net(dev1); + if (dev2->rtnl_link_ops && dev2->rtnl_link_ops->get_link_net) + dev2_parent_net = dev2->rtnl_link_ops->get_link_net(dev2); 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 +133,9 @@ 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; + struct net *parent_net = net; bool ret; /* check if this is a batman-adv mesh interface */ @@ -133,13 +147,16 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev) dev_get_iflink(net_dev) == net_dev->ifindex) return false; + if (net_dev->rtnl_link_ops && net_dev->rtnl_link_ops->get_link_net) + parent_net = net_dev->rtnl_link_ops->get_link_net(net_dev); + /* recurse over the parent device */ - parent_dev = __dev_get_by_index(net, dev_get_iflink(net_dev)); + parent_dev = __dev_get_by_index(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); -- 2.7.0.rc3