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authorLinus Lüssing <linus.luessing@c0d3.blue>2020-09-15 10:54:08 +0300
committerSimon Wunderlich <sw@simonwunderlich.de>2020-09-15 11:05:24 +0300
commit3236d215ad38a3f5372e65cd1e0a52cf93d3c6a2 (patch)
tree203613936d4e054858f80ed304700b33163626a3 /net/batman-adv/multicast.h
parent4bba9dab86b6ac15ca560ef1f2b5aa4529cbf784 (diff)
downloadlinux-3236d215ad38a3f5372e65cd1e0a52cf93d3c6a2.tar.xz
batman-adv: mcast: fix duplicate mcast packets in BLA backbone from LAN
Scenario: * Multicast frame send from a BLA backbone (multiple nodes with their bat0 bridged together, with BLA enabled) Issue: * BLA backbone nodes receive the frame multiple times on bat0 For multicast frames received via batman-adv broadcast packets the originator of the broadcast packet is checked before decapsulating and forwarding the frame to bat0 (batadv_bla_is_backbone_gw()-> batadv_recv_bcast_packet()). If it came from a node which shares the same BLA backbone with us then it is not forwarded to bat0 to avoid a loop. When sending a multicast frame in a non-4-address batman-adv unicast packet we are currently missing this check - and cannot do so because the batman-adv unicast packet has no originator address field. However, we can simply fix this on the sender side by only sending the multicast frame via unicasts to interested nodes which do not share the same BLA backbone with us. This also nicely avoids some unnecessary transmissions on mesh side. Note that no infinite loop was observed, probably because of dropping via batadv_interface_tx()->batadv_bla_tx(). However the duplicates still utterly confuse switches/bridges, ICMPv6 duplicate address detection and neighbor discovery and therefore leads to long delays before being able to establish TCP connections, for instance. And it also leads to the Linux bridge printing messages like: "br-lan: received packet on eth1 with own address as source address ..." Fixes: 2d3f6ccc4ea5 ("batman-adv: Modified forwarding behaviour for multicast packets") Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Diffstat (limited to 'net/batman-adv/multicast.h')
-rw-r--r--net/batman-adv/multicast.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/net/batman-adv/multicast.h b/net/batman-adv/multicast.h
index ebf825991ecd..3e114bc5ca3b 100644
--- a/net/batman-adv/multicast.h
+++ b/net/batman-adv/multicast.h
@@ -46,6 +46,11 @@ enum batadv_forw_mode
batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
struct batadv_orig_node **mcast_single_orig);
+int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv,
+ struct sk_buff *skb,
+ unsigned short vid,
+ struct batadv_orig_node *orig_node);
+
int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
unsigned short vid);
@@ -72,6 +77,16 @@ batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
}
static inline int
+batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv,
+ struct sk_buff *skb,
+ unsigned short vid,
+ struct batadv_orig_node *orig_node)
+{
+ kfree_skb(skb);
+ return NET_XMIT_DROP;
+}
+
+static inline int
batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb,
unsigned short vid)
{