When we receive an OGM from from a node for the first time, the last_real_seqno field of the orig_node structure has not been initialised yet. The value of this field is used to compute the current ogm-seqno window and therefore the protection mechanism will probably drop the packet due to an out-of-window error. To avoid this situation this patch adds a check to skip the window protection mechanism if no neighbour nodes have already been added. When the first neighbour node is added, the last_real_seqno field is initialised too.
Reported-by: Marek Lindner lindner_marek@yahoo.de Signed-off-by: Antonio Quartulli ordex@autistici.org --- net/batman-adv/bat_iv_ogm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index f36b54c..873ea40 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -861,7 +861,8 @@ static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;
/* signalize caller that the packet is to be dropped. */ - if (window_protected(bat_priv, seq_diff, + if (!hlist_empty(&orig_node->neigh_list) && + window_protected(bat_priv, seq_diff, &orig_node->batman_seqno_reset)) goto out;