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batman-adv: skip the window protection test when the originator has no neighbours

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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>
This commit is contained in:
Antonio Quartulli 2012-02-26 15:39:42 +01:00
parent c97c72b493
commit 1e5cc266db
1 changed files with 2 additions and 1 deletions
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3
net/batman-adv/bat_iv_ogm.c
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@ -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;