From: Simon Wunderlich simon.wunderlich@open-mesh.com

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 --- net/batman-adv/bridge_loop_avoidance.h | 18 ++++++++++++++++++ net/batman-adv/soft-interface.c | 3 ++- 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/net/batman-adv/bridge_loop_avoidance.h b/net/batman-adv/bridge_loop_avoidance.h index 1ae93e4..af550d8 100644 --- a/net/batman-adv/bridge_loop_avoidance.h +++ b/net/batman-adv/bridge_loop_avoidance.h @@ -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 + * + * Returns 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); diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 7b3494a..1f55b4b 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -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);