This fixes erroneously cleared sequence number when node performs IV
Recovery procedure on startup in a following scenario:
- node has IV Index set to <N>
- node starts in IV_UPD_INIT state
- node receives a Secure Network Beacon with IV Index <N>+1 and IV
Update flag set
Upon reception, the node shall:
- increase its IV Index to <N>+1
- enter IV_UPD_UPDATING state
This means that the node keeps transmitting messages using IV Index
equal to <N>, therefore it shall not reset its Sequence Number before IV
Update procedure completes.
If, on the other hand, received Secure Network Beacon contains IV Index
<N>+2 (or more), the node shall:
- increase its IV Index to <N>+2 (or more)
- enter IV_UPD_UPDATING state
- reset the Sequence Number to 0
---
mesh/net.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mesh/net.c b/mesh/net.c
index 2785039db..b4b390541 100644
--- a/mesh/net.c
+++ b/mesh/net.c
@@ -2735,7 +2735,7 @@ static void update_iv_kr_state(struct mesh_subnet *subnet, uint32_t iv_index,
}
if (net->iv_upd_state == IV_UPD_INIT) {
- if (iv_index > net->iv_index)
+ if (iv_index > net->iv_index + 1)
mesh_net_set_seq_num(net, 0);
net->iv_index = iv_index;
--
2.19.1
