batman-adv: drop STP over batman

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 4d639b303bd7..10ab49aa568f 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -130,6 +130,8 @@ static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
         struct hard_iface *primary_if = NULL;
         struct bcast_packet *bcast_packet;
         struct vlan_ethhdr *vhdr;
+        static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 0x00,
+                                                   0x00};
         unsigned int header_len = 0;
         int data_len = skb->len, ret;
         short vid = -1;
@@ -159,6 +161,12 @@ static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
         /* Register the client MAC in the transtable */
         tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
 
+        /* don't accept stp packets. STP does not help in meshes.
+         * better use the bridge loop avoidance ...
+         */
+        if (compare_eth(ethhdr->h_dest, stp_addr))
+                goto dropped;
+
         if (is_multicast_ether_addr(ethhdr->h_dest)) {
                 do_bcast = true;