From 7d050890f01f32ebb394140cf3206ad5a5548d79 Mon Sep 17 00:00:00 2001
From: Isak Westin <isak.westin@loytec.com>
Date: Thu, 29 Sep 2022 13:03:42 +0200
Subject: mesh: Ignore SNB with invalid IV Index values

If we are in IV update in progress state, and receive a Secure Network
beacon with an IV index equal to last known IV index + 1, and IV update
flag set to 1, it should be ignored. See MshPRFv1.0.1 section 3.10.5.
---
 mesh/net.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'mesh')

diff --git a/mesh/net.c b/mesh/net.c
index dc3d1fd80..c225fdb9a 100644
--- a/mesh/net.c
+++ b/mesh/net.c
@@ -2671,6 +2671,10 @@ static bool update_iv_ivu_state(struct mesh_net *net, uint32_t iv_index,
 		if (iv_index == net->iv_index)
 			return false;
 
+		/* Ignore beacon with invalid IV index value */
+		if (net->iv_update && iv_index == net->iv_index + 1)
+			return false;
+
 		if (!net->iv_update) {
 			l_debug("iv_upd_state = IV_UPD_UPDATING");
 			net->iv_upd_state = IV_UPD_UPDATING;
-- 
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