batman-adv: add isolation_mark sysfs attribute

This attribute can be used to set and read the value and the
mask of the skb mark which will be used to classify the
source non-mesh client as ISOLATED. In this way a client can
be advertised as such and the mark can potentially be
restored at the receiving node before delivering the skb.

This can be helpful for creating network wide netfilter
policies.

This sysfs file expects a string of the shape "$mark/$mask".
Where $mark has to be a 32-bit number in any base, while
$mask must be a 32bit mask expressed in hex base. Only bits
in $mark covered by the bitmask are really stored.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index b569932ddcc4..35a82e36c003 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -701,6 +701,8 @@ static int batadv_softif_init_late(struct net_device *dev)
 #endif
         bat_priv->tt.last_changeset = NULL;
         bat_priv->tt.last_changeset_len = 0;
+        bat_priv->isolation_mark = 0;
+        bat_priv->isolation_mark_mask = 0;
 
         /* randomize initial seqno to avoid collision */
         get_random_bytes(&random_seqno, sizeof(random_seqno));