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_ENABLED 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: Antonio Quartulli a@unstable.cc --- 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 3cb35c66..f303a149 100644 --- a/include/uapi/linux/batman_adv.h +++ b/include/uapi/linux/batman_adv.h @@ -388,6 +388,14 @@ enum batadv_nl_attrs { */ BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED,
+ /** + * @BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED: 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_ENABLED, + /* 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 0a29dc75..68440d2f 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_ENABLED] = { .type = NLA_U8 }, [BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED] = { .type = NLA_U8 }, };
/** @@ -291,6 +292,12 @@ 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_ENABLED, + !!atomic_read(&bat_priv->distributed_arp_table))) + goto nla_put_failure; +#endif /* CONFIG_BATMAN_ADV_DAT */ + if (primary_if) batadv_hardif_put(primary_if);
@@ -415,6 +422,16 @@ 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_ENABLED]) { + attr = info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED]; + + 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;