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

On branch : master

commit 3ef9439011e2b0692fbb965e73c4c70103aa5892 Author: Sven Eckelmann sven@narfation.org Date: Fri Jun 9 17:06:51 2017 +0200

batman-adv: Accept only filled wifi station info

The wifi driver can decide to not provide parts of the station info. For example, the expected throughput of the station can be omitted when the used rate control doesn't provide this kind of information.

The B.A.T.M.A.N. V implementation must therefore check the filled bitfield before it tries to access the expected_throughput of the returned station_info.

Reported-by: Alvaro Antelo alvaro.antelo@gmail.com Fixes: 5c3245172c01 ("batman-adv: ELP - compute the metric based on the estimated throughput") Signed-off-by: Sven Eckelmann sven@narfation.org Reviewed-by: Marek Lindner mareklindner@neomailbox.ch Signed-off-by: Simon Wunderlich sw@simonwunderlich.de

3ef9439011e2b0692fbb965e73c4c70103aa5892 compat-include/linux/nl80211.h | 14 ++++++++++++++ compat-include/uapi/linux/nl80211.h | 16 ++++++++++++++++ net/batman-adv/bat_v_elp.c | 4 ++++ 3 files changed, 34 insertions(+)

diff --git a/compat-include/linux/nl80211.h b/compat-include/linux/nl80211.h new file mode 100644 index 00000000..e6654df8 --- /dev/null +++ b/compat-include/linux/nl80211.h @@ -0,0 +1,14 @@ +#ifndef _NET_BATMAN_ADV_COMPAT_LINUX_NL80211_H_ +#define _NET_BATMAN_ADV_COMPAT_LINUX_NL80211_H_ + +#include <linux/version.h> +#include_next <linux/nl80211.h> + +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) + +/* Linux 3.15 misses the uapi include.... */ +#include <uapi/linux/nl80211.h> + +#endif /* < KERNEL_VERSION(3, 16, 0) */ + +#endif /* _NET_BATMAN_ADV_COMPAT_LINUX_NL80211_H_ */ diff --git a/compat-include/uapi/linux/nl80211.h b/compat-include/uapi/linux/nl80211.h new file mode 100644 index 00000000..06f5625a --- /dev/null +++ b/compat-include/uapi/linux/nl80211.h @@ -0,0 +1,16 @@ +#ifndef _NET_BATMAN_ADV_COMPAT_UAPI_LINUX_NL80211_H_ +#define _NET_BATMAN_ADV_COMPAT_UAPI_LINUX_NL80211_H_ + +#include <linux/version.h> +#include_next <uapi/linux/nl80211.h> + +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0) + +/* for batadv_v_elp_get_throughput which would have used + * STATION_INFO_EXPECTED_THROUGHPUT in Linux 4.0.0 + */ +#define NL80211_STA_INFO_EXPECTED_THROUGHPUT 28 + +#endif /* < KERNEL_VERSION(4, 0, 0) */ + +#endif /* _NET_BATMAN_ADV_COMPAT_UAPI_LINUX_NL80211_H_ */ diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c index 96e73337..b58007b7 100644 --- a/net/batman-adv/bat_v_elp.c +++ b/net/batman-adv/bat_v_elp.c @@ -19,6 +19,7 @@ #include "main.h"

#include <linux/atomic.h> +#include <linux/bitops.h> #include <linux/byteorder/generic.h> #include <linux/errno.h> #include <linux/etherdevice.h> @@ -29,6 +30,7 @@ #include <linux/kernel.h> #include <linux/kref.h> #include <linux/netdevice.h> +#include <linux/nl80211.h> #include <linux/random.h> #include <linux/rculist.h> #include <linux/rcupdate.h> @@ -111,6 +113,8 @@ static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh) } if (ret) goto default_throughput; + if (!(sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT))) + goto default_throughput;

return sinfo.expected_throughput / 100; }