The mesh interface can use a distributed hash table to answer ARP requests
without flooding the request through the whole mesh.
The BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH commands allow to set/get the
configuration of this feature using the BATADV_ATTR_DISTRIBUTED_ARP_TABLE
attribute. Setting the u8 to zero will disable this feature and setting it
to something else is enabling this feature.
Cc: Jiri Pirko <j...@mellanox.com>
Signed-off-by: Sven Eckelmann <s...@narfation.org>
---
include/uapi/linux/batman_adv.h | 8 ++++++++
net/batman-adv/netlink.c | 17 +++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h
index 711379ef..618c727c 100644
--- a/include/uapi/linux/batman_adv.h
+++ b/include/uapi/linux/batman_adv.h
@@ -387,6 +387,14 @@ enum batadv_nl_attrs {
*/
BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE,
+ /**
+ * @BATADV_ATTR_DISTRIBUTED_ARP_TABLE: whether the distributed arp table
+ * feature is enabled. This feature uses a distributed hash table to
+ * answer ARP requests without flooding the request through the whole
+ * mesh.
+ */
+ BATADV_ATTR_DISTRIBUTED_ARP_TABLE,
+
/* add attributes above here, update the policy in netlink.c */
/**
diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c
index 95181808..d93039b2 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -145,6 +145,7 @@ static const struct nla_policy
batadv_netlink_policy[NUM_BATADV_ATTR] = {
[BATADV_ATTR_ISOLATION_MASK] = { .type = NLA_U32 },
[BATADV_ATTR_BONDING] = { .type = NLA_U8 },
[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE] = { .type = NLA_U8 },
+ [BATADV_ATTR_DISTRIBUTED_ARP_TABLE] = { .type = NLA_U8 },
};
/**
@@ -290,6 +291,12 @@ static int batadv_netlink_mesh_put(struct sk_buff *msg,
goto nla_put_failure;
#endif /* CONFIG_BATMAN_ADV_BLA */
+#ifdef CONFIG_BATMAN_ADV_DAT
+ if (nla_put_u8(msg, BATADV_ATTR_DISTRIBUTED_ARP_TABLE,
+ !!atomic_read(&bat_priv->distributed_arp_table)))
+ goto nla_put_failure;
+#endif /* CONFIG_BATMAN_ADV_DAT */
+
batadv_hardif_put(primary_if);
genlmsg_end(msg, hdr);
@@ -413,6 +420,16 @@ static int batadv_netlink_set_mesh(struct sk_buff *skb,
struct genl_info *info)
}
#endif /* CONFIG_BATMAN_ADV_BLA */
+#ifdef CONFIG_BATMAN_ADV_DAT
+ if (info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE]) {
+ attr = info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE];
+
+ atomic_set(&bat_priv->distributed_arp_table,
+ !!nla_get_u8(attr));
+ batadv_dat_status_update(bat_priv->soft_iface);
+ }
+#endif /* CONFIG_BATMAN_ADV_DAT */
+
batadv_netlink_notify_mesh(bat_priv);
return 0;
--
2.19.1
