b.a.t.m.a.n.lists.open-mesh.org archive mirror
 help / color / mirror / Atom feed
From: Andreas Pape <apape@phoenixcontact.com>
To: b.a.t.m.a.n@lists.open-mesh.org
Subject: [B.A.T.M.A.N.] [PATCHv2 4/7] batman-adv: drop unicast packets from other backbone gw
Date: Fri, 26 Feb 2016 14:18:54 +0100	[thread overview]
Message-ID: <1456492734-29785-1-git-send-email-apape@phoenixcontact.com> (raw)

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.

Signed-off-by: Andreas Pape <apape@phoenixcontact.com>
 net/batman-adv/routing.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 4dd646a..606fd22 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -854,9 +854,11 @@ 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 */
@@ -896,6 +898,19 @@ 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 (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);
+			return NET_RX_DROP;
+		}
 		if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
 			goto rx_success;


Sitz der Gesellschaft / registered office of the company: 31812 Bad Pyrmont
USt-Id-Nr.: DE811742156
Amtsgericht Hannover HRB 100528 / district court Hannover HRB 100528
Geschäftsführer / Executive Board: Roland Bent, Dr. Martin Heubeck
Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren, jegliche anderweitige Verwendung sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet.
This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure, distribution or other use of the material or parts thereof is strictly forbidden.

             reply	other threads:[~2016-02-26 13:18 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-26 13:18 Andreas Pape [this message]
2016-02-26 16:07 ` [B.A.T.M.A.N.] [PATCHv2 4/7] batman-adv: drop unicast packets from other backbone gw Sven Eckelmann
2016-03-10 15:03 ` Simon Wunderlich

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1456492734-29785-1-git-send-email-apape@phoenixcontact.com \
    --to=apape@phoenixcontact.com \
    --cc=b.a.t.m.a.n@lists.open-mesh.org \


* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).