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batman-adv: Add distributed_arp_table mesh genl configuration

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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>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2018-11-23 13:06:42 +01:00 committed by Simon Wunderlich
parent 43ff6105a5
commit a1c8de8032
2 changed files with 25 additions and 0 deletions
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8
include/uapi/linux/batman_adv.h
View File

@ -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 */
/**

17
net/batman-adv/netlink.c
View File

@ -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;