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.

Signed-off-by: Manika Shrivastava <manika.sh@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>

diff --git a/mesh/net.c b/mesh/net.c
index ca6116f..eb949d2 100644 (file)
--- a/mesh/net.c
+++ b/mesh/net.c
@@ -2669,6 +2669,10 @@ 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;