From 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 Mon Sep 17 00:00:00 2001 From: Andreas Pape Date: Mon, 5 Sep 2016 13:20:27 +0200 Subject: [PATCH] batman-adv: drop unicast packets from other backbone gw Additional dropping of unicast packets received from another backbone gw if 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. Signed-off-by: Andreas Pape Acked-by: Simon Wunderlich [sven@narfation.org: fix conflicts with current version] Signed-off-by: Sven Eckelmann Signed-off-by: Simon Wunderlich --- net/batman-adv/routing.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 7fd740b6e36d..c85dc3102519 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -941,15 +941,17 @@ int batadv_recv_unicast_packet(struct sk_buff *skb, struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); struct batadv_unicast_packet *unicast_packet; struct batadv_unicast_4addr_packet *unicast_4addr_packet; - u8 *orig_addr; - struct batadv_orig_node *orig_node = NULL; + u8 *orig_addr, *orig_addr_gw; + struct batadv_orig_node *orig_node = NULL, *orig_node_gw = NULL; int check, hdr_size = sizeof(*unicast_packet); enum batadv_subtype subtype; - bool is4addr; + struct ethhdr *ethhdr; int ret = NET_RX_DROP; + bool is4addr, is_gw; 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 */ @@ -972,6 +974,23 @@ int batadv_recv_unicast_packet(struct sk_buff *skb, /* packet for me */ if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { + /* If this is a unicast packet from another backgone gw, + * drop it. + */ + orig_addr_gw = ethhdr->h_source; + orig_node_gw = batadv_orig_hash_find(bat_priv, orig_addr_gw); + if (orig_node_gw) { + is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw, + hdr_size); + batadv_orig_node_put(orig_node_gw); + if (is_gw) { + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "Dropped unicast pkt received from another backbone gw %pM.\n", + orig_addr_gw); + return NET_RX_DROP; + } + } + if (is4addr) { subtype = unicast_4addr_packet->subtype; batadv_dat_inc_counter(bat_priv, subtype); -- 2.20.1