Additional dropping of unicast packets received from another backbone gw of
the same backbone network before being forwarded to the same backbone again
is necessary. It was observed in a test setup that in rare cases these
frames lead to looping unicast traffic backbone->mesh->backbone.
Acked-by: Simon Wunderlich <s...@simonwunderlich.de>
Signed-off-by: Andreas Pape <ap...@phoenixcontact.com>
---
net/batman-adv/routing.c | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index ae850f2..1ef0735 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -864,9 +864,11 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
int check, hdr_size = sizeof(*unicast_packet);
enum batadv_subtype subtype;
bool is4addr;
+ struct ethhdr *ethhdr;
unicast_packet = (struct batadv_unicast_packet *)skb->data;
unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
+ ethhdr = eth_hdr(skb);
is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR;
/* the caller function should have already pulled 2 bytes */
@@ -906,6 +908,20 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
}
}
+ /* If this is a unicast packet from another backgone gw,
+ * drop it.
+ */
+ orig_addr = ethhdr->h_source;
+ orig_node = batadv_orig_hash_find(bat_priv, orig_addr);
+ if (orig_node &&
+ batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) {
+ batadv_dbg(BATADV_DBG_BLA, bat_priv,
+ "Dropped unicast pkt received from another
backbone gw %pM.\n",
+ orig_addr);
+ batadv_orig_node_put(orig_node);
+ return NET_RX_DROP;
+ }
+
if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
hdr_size))
goto rx_success;
--
1.7.0.4
..................................................................
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