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authorLinus Lüssing <linus.luessing@web.de>2014-02-15 17:47:52 +0100
committerAntonio Quartulli <antonio@meshcoding.com>2014-03-22 09:18:57 +0100
commit1d8ab8d3c176d31530b3ffd4547cf731018e2a45 (patch)
treeb62208972cdfb70a853ff5177c29154fd165bea7 /net/batman-adv/soft-interface.c
parent60432d756cf06e597ef9da511402dd059b112447 (diff)
downloadop-kernel-dev-1d8ab8d3c176d31530b3ffd4547cf731018e2a45.zip
op-kernel-dev-1d8ab8d3c176d31530b3ffd4547cf731018e2a45.tar.gz
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>
Diffstat (limited to 'net/batman-adv/soft-interface.c')
-rw-r--r--net/batman-adv/soft-interface.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 8ff47b7..1a643fe6 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -32,6 +32,7 @@
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
+#include "multicast.h"
#include "bridge_loop_avoidance.h"
#include "network-coding.h"
@@ -170,6 +171,8 @@ static int batadv_interface_tx(struct sk_buff *skb,
unsigned short vid;
uint32_t seqno;
int gw_mode;
+ enum batadv_forw_mode forw_mode;
+ struct batadv_orig_node *mcast_single_orig = NULL;
if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
goto dropped;
@@ -247,9 +250,19 @@ static int batadv_interface_tx(struct sk_buff *skb,
* directed to a DHCP server
*/
goto dropped;
- }
send:
+ if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
+ forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
+ &mcast_single_orig);
+ if (forw_mode == BATADV_FORW_NONE)
+ goto dropped;
+
+ if (forw_mode == BATADV_FORW_SINGLE)
+ do_bcast = false;
+ }
+ }
+
batadv_skb_set_priority(skb, 0);
/* ethernet packet should be broadcasted */
@@ -301,6 +314,10 @@ send:
if (ret)
goto dropped;
ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
+ } else if (mcast_single_orig) {
+ ret = batadv_send_skb_unicast(bat_priv, skb,
+ BATADV_UNICAST, 0,
+ mcast_single_orig, vid);
} else {
if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
skb))
@@ -691,6 +708,7 @@ static int batadv_softif_init_late(struct net_device *dev)
#endif
#ifdef CONFIG_BATMAN_ADV_MCAST
bat_priv->mcast.flags = BATADV_NO_FLAGS;
+ atomic_set(&bat_priv->multicast_mode, 1);
atomic_set(&bat_priv->mcast.num_disabled, 0);
#endif
atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
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