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 jiri@mellanox.com Signed-off-by: Sven Eckelmann sven@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;