The mesh interface can try to detect loops in the same mesh caused by
(indirectly) bridged mesh/soft-interfaces of different nodes. Some of the
loops can also be resolved without breaking the mesh.
The BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH commands allow to set/get the
configuration of this feature using the BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE
attribute. Setting the u8 to zero will disable this feature and setting it
to something else is enabling this feature.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
Cc: Simon Wunderlich <sw@simonwunderlich.de>
---
include/uapi/linux/batman_adv.h | 7 +++++++
net/batman-adv/netlink.c | 17 +++++++++++++++++
2 files changed, 24 insertions(+)
@@ -380,6 +380,13 @@ enum batadv_nl_attrs {
*/
BATADV_ATTR_BONDING,
+ /**
+ * @BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE: whether the bridge loop avoidance
+ * feature is enabled. This feature detects and avoids loops between
+ * the mesh and devices bridged with the soft interface
+ */
+ BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE,
+
/* add attributes above here, update the policy in netlink.c */
/**
@@ -144,6 +144,7 @@ static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
[BATADV_ATTR_ISOLATION_MARK] = { .type = NLA_U32 },
[BATADV_ATTR_ISOLATION_MASK] = { .type = NLA_U32 },
[BATADV_ATTR_BONDING] = { .type = NLA_U8 },
+ [BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE] = { .type = NLA_U8 },
};
/**
@@ -283,6 +284,12 @@ static int batadv_netlink_mesh_put(struct sk_buff *msg,
!!atomic_read(&bat_priv->bonding)))
goto nla_put_failure;
+#ifdef CONFIG_BATMAN_ADV_BLA
+ if (nla_put_u8(msg, BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE,
+ !!atomic_read(&bat_priv->bridge_loop_avoidance)))
+ goto nla_put_failure;
+#endif /* CONFIG_BATMAN_ADV_BLA */
+
batadv_hardif_put(primary_if);
genlmsg_end(msg, hdr);
@@ -396,6 +403,16 @@ static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info)
atomic_set(&bat_priv->bonding, !!nla_get_u8(attr));
}
+#ifdef CONFIG_BATMAN_ADV_BLA
+ if (info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE]) {
+ attr = info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE];
+
+ atomic_set(&bat_priv->bridge_loop_avoidance,
+ !!nla_get_u8(attr));
+ batadv_bla_status_update(bat_priv->soft_iface);
+ }
+#endif /* CONFIG_BATMAN_ADV_BLA */
+
batadv_netlink_notify_mesh(bat_priv);
return 0;