linux/net/batman-adv/multicast.h
Linus Lüssing 1d8ab8d3c1 batman-adv: Modified forwarding behaviour for multicast packets
With this patch a multicast packet is not always simply flooded anymore,
the behaviour for the following cases is changed to reduce
unnecessary overhead:

If all nodes within the horizon of a certain node have signalized
multicast listener announcement capability then an IPv6 multicast packet
with a destination of IPv6 link-local scope (excluding ff02::1) coming
from the upstream of this node...

* ...is dropped if there is no according multicast listener in the
  translation table,
* ...is forwarded via unicast if there is a single node with interested
  multicast listeners
* ...and otherwise still gets flooded.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2014-03-22 09:18:57 +01:00

81 lines
2.1 KiB
C

/* Copyright (C) 2014 B.A.T.M.A.N. contributors:
*
* Linus Lüssing
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _NET_BATMAN_ADV_MULTICAST_H_
#define _NET_BATMAN_ADV_MULTICAST_H_
/**
* batadv_forw_mode - the way a packet should be forwarded as
* @BATADV_FORW_ALL: forward the packet to all nodes (currently via classic
* flooding)
* @BATADV_FORW_SINGLE: forward the packet to a single node (currently via the
* BATMAN unicast routing protocol)
* @BATADV_FORW_NONE: don't forward, drop it
*/
enum batadv_forw_mode {
BATADV_FORW_ALL,
BATADV_FORW_SINGLE,
BATADV_FORW_NONE,
};
#ifdef CONFIG_BATMAN_ADV_MCAST
void batadv_mcast_mla_update(struct batadv_priv *bat_priv);
enum batadv_forw_mode
batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
struct batadv_orig_node **mcast_single_orig);
void batadv_mcast_init(struct batadv_priv *bat_priv);
void batadv_mcast_free(struct batadv_priv *bat_priv);
void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);
#else
static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
{
return;
}
static inline enum batadv_forw_mode
batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
struct batadv_orig_node **mcast_single_orig)
{
return BATADV_FORW_ALL;
}
static inline int batadv_mcast_init(struct batadv_priv *bat_priv)
{
return 0;
}
static inline void batadv_mcast_free(struct batadv_priv *bat_priv)
{
return;
}
static inline void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node)
{
return;
}
#endif /* CONFIG_BATMAN_ADV_MCAST */
#endif /* _NET_BATMAN_ADV_MULTICAST_H_ */