Repository : ssh://git@open-mesh.org/batman-adv

On branch : master

commit 2b45bb6c3aadc4c4aed0ba7e6d8aae248583067d Author: Marek Lindner mareklindner@neomailbox.ch Date: Fri Sep 30 15:21:04 2016 +0200

batman-adv: additional checks for virtual interfaces on top of WiFi

In a few situations batman-adv tries to determine whether a given interface is a WiFi interface to enable specific WiFi optimizations. If the interface batman-adv has been configured with is a virtual interface (e.g. VLAN) it would not be properly detected as WiFi interface and thus not benefit from the special WiFi treatment. This patch changes that by peeking under the hood whenever a virtual interface is in play.

Signed-off-by: Marek Lindner mareklindner@neomailbox.ch [sven.eckelmann@open-mesh.com: integrate in wifi_flags caching, retrieve namespace of link interface] Signed-off-by: Sven Eckelmann sven.eckelmann@open-mesh.com Signed-off-by: Simon Wunderlich sw@simonwunderlich.de

2b45bb6c3aadc4c4aed0ba7e6d8aae248583067d net/batman-adv/hard-interface.c | 58 +++++++++++++++++++++++++++++++++++++++++ net/batman-adv/types.h | 4 +++ 2 files changed, 62 insertions(+)

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index 07ce424..59455cd 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -202,6 +202,47 @@ static bool batadv_is_valid_iface(const struct net_device *net_dev) }

/** + * batadv_get_real_netdevice - check if the given netdev struct is a virtual + * interface on top of another 'real' interface + * @netdev: the device to check + * + * Return: the 'real' net device or the original net device and NULL in case + * of an error. + */ +static struct net_device *batadv_get_real_netdevice(struct net_device *netdev) +{ + struct batadv_hard_iface *hard_iface = NULL; + struct net_device *real_netdev = NULL; + struct net *real_net; + struct net *net; + int ifindex; + + ASSERT_RTNL(); + + if (!netdev) + return NULL; + + if (netdev->ifindex == dev_get_iflink(netdev)) { + dev_hold(netdev); + return netdev; + } + + hard_iface = batadv_hardif_get_by_netdev(netdev); + if (!hard_iface || !hard_iface->soft_iface) + goto out; + + net = dev_net(hard_iface->soft_iface); + ifindex = dev_get_iflink(netdev); + real_net = batadv_getlink_net(netdev, net); + real_netdev = dev_get_by_index(real_net, ifindex); + +out: + if (hard_iface) + batadv_hardif_put(hard_iface); + return real_netdev; +} + +/** * batadv_is_wext_netdev - check if the given net_device struct is a * wext wifi interface * @net_device: the device to check @@ -254,6 +295,7 @@ static bool batadv_is_cfg80211_netdev(struct net_device *net_device) static u32 batadv_wifi_flags_evaluate(struct net_device *net_device) { u32 wifi_flags = 0; + struct net_device *real_netdev;

if (batadv_is_wext_netdev(net_device)) wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT; @@ -261,6 +303,21 @@ static u32 batadv_wifi_flags_evaluate(struct net_device *net_device) if (batadv_is_cfg80211_netdev(net_device)) wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;

+ real_netdev = batadv_get_real_netdevice(net_device); + if (!real_netdev) + return wifi_flags; + + if (real_netdev == net_device) + goto out; + + if (batadv_is_wext_netdev(real_netdev)) + wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT; + + if (batadv_is_cfg80211_netdev(real_netdev)) + wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT; + +out: + dev_put(real_netdev); return wifi_flags; }

@@ -277,6 +334,7 @@ bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface) u32 allowed_flags = 0;

allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT; + allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;

return !!(hard_iface->wifi_flags & allowed_flags); } diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 1bcce32..caa00a5 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -123,10 +123,14 @@ struct batadv_hard_iface_bat_v { * of a batadv_hard_iface * @BATADV_HARDIF_WIFI_WEXT_DIRECT: it is a wext wifi device * @BATADV_HARDIF_WIFI_CFG80211_DIRECT: it is a cfg80211 wifi device + * @BATADV_HARDIF_WIFI_WEXT_INDIRECT: link device is a wext wifi device + * @BATADV_HARDIF_WIFI_CFG80211_INDIRECT: link device is a cfg80211 wifi device */ enum batadv_hard_iface_wifi_flags { BATADV_HARDIF_WIFI_WEXT_DIRECT = BIT(0), BATADV_HARDIF_WIFI_CFG80211_DIRECT = BIT(1), + BATADV_HARDIF_WIFI_WEXT_INDIRECT = BIT(2), + BATADV_HARDIF_WIFI_CFG80211_INDIRECT = BIT(3), };

/**