Commit a1c8de80 authored by Sven Eckelmann's avatar Sven Eckelmann Committed by Simon Wunderlich
Browse files

batman-adv: Add distributed_arp_table mesh genl configuration 



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: default avatarSven Eckelmann <sven@narfation.org>
Signed-off-by: default avatarSimon Wunderlich <sw@simonwunderlich.de>
parent 43ff6105

include/uapi/linux/batman_adv.h

+8 −0
Original line number Diff line number Diff line
@@ -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 */



	/**

net/batman-adv/netlink.c

+17 −0
Original line number Diff line number Diff line
@@ -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_fill(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;

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