Commit 3e15b06e authored by Sven Eckelmann's avatar Sven Eckelmann Committed by Simon Wunderlich
Browse files

batman-adv: Add fragmentation mesh genl configuration 



The mesh interface can fragment unicast packets when the packet size
exceeds the outgoing slave/hard-interface MTU.

The BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH commands allow to set/get the
configuration of this feature using the BATADV_ATTR_FRAGMENTATION_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 a1c8de80

include/uapi/linux/batman_adv.h

+7 −0
Original line number Diff line number Diff line
@@ -396,6 +396,13 @@ enum batadv_nl_attrs { 
	 */

	BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED,



	/**

	 * @BATADV_ATTR_FRAGMENTATION_ENABLED: whether the data traffic going

	 *  through the mesh will be fragmented or silently discarded if the

	 *  packet size exceeds the outgoing interface MTU.

	 */

	BATADV_ATTR_FRAGMENTATION_ENABLED,



	/* add attributes above here, update the policy in netlink.c */



	/**

net/batman-adv/netlink.c

+12 −0
Original line number Diff line number Diff line
@@ -146,6 +146,7 @@ static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = { 
	[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 },

	[BATADV_ATTR_FRAGMENTATION_ENABLED]	= { .type = NLA_U8 },

};



/**
@@ -298,6 +299,10 @@ static int batadv_netlink_mesh_fill(struct sk_buff *msg, 
		goto nla_put_failure;

#endif /* CONFIG_BATMAN_ADV_DAT */



	if (nla_put_u8(msg, BATADV_ATTR_FRAGMENTATION_ENABLED,

		       !!atomic_read(&bat_priv->fragmentation)))

		goto nla_put_failure;



	if (primary_if)

		batadv_hardif_put(primary_if);
@@ -432,6 +437,13 @@ static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info) 
	}

#endif /* CONFIG_BATMAN_ADV_DAT */



	if (info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED]) {

		attr = info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED];



		atomic_set(&bat_priv->fragmentation, !!nla_get_u8(attr));

		batadv_update_min_mtu(bat_priv->soft_iface);

	}



	batadv_netlink_notify_mesh(bat_priv);



	return 0;

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