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batman-adv: don't add loop detect macs to TT 

The bridge loop avoidance (BLA) feature of batman-adv sends packets to
probe for Mesh/LAN packet loops. Those packets are not sent by real
clients and should therefore not be added to the translation table (TT).

Signed-off-by: Simon Wunderlich <simon.wunderlich@open-mesh.com>
This commit is contained in:
Simon Wunderlich 2016-11-24 16:11:01 +01:00 committed by Simon Wunderlich
parent 32bcad4b7f
commit d3e9768ab9
2 changed files with 20 additions and 1 deletions
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18
net/batman-adv/bridge_loop_avoidance.h
View File

@ -20,6 +20,8 @@
#include "main.h"
#include <linux/compiler.h>
#include <linux/stddef.h>
#include <linux/types.h>
struct net_device;
@ -27,6 +29,22 @@ struct netlink_callback;
struct seq_file;
struct sk_buff;
/**
* batadv_bla_is_loopdetect_mac - check if the mac address is from a loop detect
* frame sent by bridge loop avoidance
* @mac: mac address to check
*
* Return: true if the it looks like a loop detect frame
* (mac starts with BA:BE), false otherwise
*/
static inline bool batadv_bla_is_loopdetect_mac(const uint8_t *mac)
{
if (mac[0] == 0xba && mac[1] == 0xbe)
return true;
return false;
}
#ifdef CONFIG_BATMAN_ADV_BLA
bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
unsigned short vid, bool is_bcast);

3
net/batman-adv/soft-interface.c
View File

@ -258,7 +258,8 @@ static int batadv_interface_tx(struct sk_buff *skb,
ethhdr = eth_hdr(skb);
/* Register the client MAC in the transtable */
if (!is_multicast_ether_addr(ethhdr->h_source)) {
if (!is_multicast_ether_addr(ethhdr->h_source) &&
!batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
vid, skb->skb_iif,
skb->mark);