From 5f06473908d9e477574c59cb0854eacc38cfcf68 Mon Sep 17 00:00:00 2001 From: Isak Westin Date: Tue, 11 Oct 2022 16:06:12 +0200 Subject: mesh: Keep cancelled SAR data for at least 10 sec When a SAR transmission has been completed or cancelled, the recipent should store the block authentication values for at least 10 seconds and ignore new segments with the same values during this period. See MshPRFv1.0.1 section 3.5.3.4. --- mesh/net.c | 31 ++++++++++++++++++++++++++----- 1 file changed, 26 insertions(+), 5 deletions(-) (limited to 'mesh') diff --git a/mesh/net.c b/mesh/net.c index 3f42d962c..1d27289bf 100644 --- a/mesh/net.c +++ b/mesh/net.c @@ -46,6 +46,7 @@ #define SEG_TO 2 #define MSG_TO 60 +#define SAR_DEL 10 #define DEFAULT_TRANSMIT_COUNT 1 #define DEFAULT_TRANSMIT_INTERVAL 100 @@ -166,6 +167,7 @@ struct mesh_sar { bool segmented; bool frnd; bool frnd_cred; + bool delete; uint8_t ttl; uint8_t last_seg; uint8_t key_aid; @@ -1492,14 +1494,27 @@ static void inseg_to(struct l_timeout *seg_timeout, void *user_data) static void inmsg_to(struct l_timeout *msg_timeout, void *user_data) { struct mesh_net *net = user_data; - struct mesh_sar *sar = l_queue_remove_if(net->sar_in, + struct mesh_sar *sar = l_queue_find(net->sar_in, match_msg_timeout, msg_timeout); - l_timeout_remove(msg_timeout); - if (!sar) + if (!sar) { + l_timeout_remove(msg_timeout); return; + } - sar->msg_timeout = NULL; + if (!sar->delete) { + /* + * Incomplete timer expired, cancel SAR and start + * delete timer + */ + l_timeout_remove(sar->seg_timeout); + sar->seg_timeout = NULL; + sar->delete = true; + l_timeout_modify(sar->msg_timeout, SAR_DEL); + return; + } + + l_queue_remove(net->sar_in, sar); mesh_sar_free(sar); } @@ -1963,7 +1978,9 @@ static bool seg_rxed(struct mesh_net *net, bool frnd, uint32_t iv_index, /* Re-Send ACK for full msg */ send_net_ack(net, sar_in, expected); return true; - } + } else if (sar_in->delete) + /* Ignore cancelled */ + return false; } else { uint16_t len = MAX_SEG_TO_LEN(segN); @@ -2013,6 +2030,10 @@ static bool seg_rxed(struct mesh_net *net, bool frnd, uint32_t iv_index, /* Kill Inter-Seg timeout */ l_timeout_remove(sar_in->seg_timeout); sar_in->seg_timeout = NULL; + + /* Start delete timer */ + sar_in->delete = true; + l_timeout_modify(sar_in->msg_timeout, SAR_DEL); return true; } -- cgit v1.2.1