diff mbox series

[4.9,2/7] batman-adv: Fix own OGM check in aggregated OGMs

Message ID 20211120123958.260826-3-sven@narfation.org (mailing list archive)
State Not Applicable, archived
Delegated to: Simon Wunderlich
Headers
Series batman-adv: Fixes for stable/linux-4.9.y |

Commit Message

Sven Eckelmann Nov. 20, 2021, 12:39 p.m. UTC 
  From: Linus Lüssing <linus.luessing@c0d3.blue>

commit d8bf0c01642275c7dca1e5d02c34e4199c200b1f upstream.

The own OGM check is currently misplaced and can lead to the following
issues:

For one thing we might receive an aggregated OGM from a neighbor node
which has our own OGM in the first place. We would then not only skip
our own OGM but erroneously also any other, following OGM in the
aggregate.

For another, we might receive an OGM aggregate which has our own OGM in
a place other then the first one. Then we would wrongly not skip this
OGM, leading to populating the orginator and gateway table with ourself.

Fixes: 9323158ef9f4 ("batman-adv: OGMv2 - implement originators logic")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
[ bp: 4.9 backported: adjust context, correct fixes line ]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 net/batman-adv/bat_v_ogm.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c
index d2e6885479cb..cb94ac988618 100644
--- a/net/batman-adv/bat_v_ogm.c
+++ b/net/batman-adv/bat_v_ogm.c
@@ -690,6 +690,12 @@  static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset,
 		   ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl,
 		   ogm_packet->version, ntohs(ogm_packet->tvlv_len));
 
+	if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) {
+		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
+			   "Drop packet: originator packet from ourself\n");
+		return;
+	}
+
 	/* If the troughput metric is 0, immediately drop the packet. No need to
 	 * create orig_node / neigh_node for an unusable route.
 	 */
@@ -788,11 +794,6 @@  int batadv_v_ogm_packet_recv(struct sk_buff *skb,
 	if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
 		return NET_RX_DROP;
 
-	ogm_packet = (struct batadv_ogm2_packet *)skb->data;
-
-	if (batadv_is_my_mac(bat_priv, ogm_packet->orig))
-		return NET_RX_DROP;
-
 	batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
 	batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
 			   skb->len + ETH_HLEN);