[B.A.T.M.A.N.] [PATCH 1/2] batman-adv: fix aggregation timing bug

["Linus Lüssing" <linus.luessing@web.de>]

From: Marek Lindner <lindner_marek@yahoo.de>

batman-adv aggregates routing packets to reduce the number of packets in
the air. Every outgoing packet is compared with other packets in the
buffer to determine whether it can be aggregated or not. Packets sent
at a lower interval can be held back longer to maximize the aggregation.
Due to insufficient checking batman-adv held back all packets for a
certain time depending on its own lowest interval rate which slowed
down all other nodes.

Reported-by: Linus Luessing <linus.luessing@web.de>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 aggregation.c |   12 ++++++++++++
 send.c        |   10 +---------
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/batman-adv-kernelland/aggregation.c b/batman-adv-kernelland/aggregation.c
index a829814..0635b5a 100644
--- a/batman-adv-kernelland/aggregation.c
+++ b/batman-adv-kernelland/aggregation.c
@@ -52,6 +52,8 @@ static bool can_aggregate_with(struct batman_packet *new_batman_packet,
 	 */
 
 	if (time_before(send_time, forw_packet->send_time) &&
+	    time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
+					forw_packet->send_time) &&
 	    (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
 
 		/**
@@ -196,6 +198,16 @@ void add_bat_packet_to_list(unsigned char *packet_buff, int packet_len,
 	if (forw_packet_aggr == NULL) {
 		/* the following section can run without the lock */
 		spin_unlock_irqrestore(&forw_bat_list_lock, flags);
+
+		/**
+		 * if we could not aggregate this packet with one of the others
+		 * we hold it back for a while, so that it might be aggregated
+		 * later on
+		 */
+		if ((!own_packet) &&
+		    (atomic_read(&bat_priv->aggregation_enabled)))
+			send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
+
 		new_aggregated_packet(packet_buff, packet_len,
 				      send_time, direct_link,
 				      if_incoming, own_packet);
diff --git a/batman-adv-kernelland/send.c b/batman-adv-kernelland/send.c
index 1c82f43..4320855 100644
--- a/batman-adv-kernelland/send.c
+++ b/batman-adv-kernelland/send.c
@@ -49,15 +49,7 @@ static unsigned long own_send_time(void)
 /* when do we schedule a forwarded packet to be sent */
 static unsigned long forward_send_time(struct bat_priv *bat_priv)
 {
-	unsigned long send_time = jiffies; /* Starting now plus... */
-
-	if (atomic_read(&bat_priv->aggregation_enabled))
-		send_time += (((MAX_AGGREGATION_MS - (JITTER/2) +
-				(random32() % JITTER)) * HZ) / 1000);
-	else
-		send_time += (((random32() % (JITTER/2)) * HZ) / 1000);
-
-	return send_time;
+	return jiffies + (((random32() % (JITTER/2)) * HZ) / 1000);
 }
 
 /* send out an already prepared packet to the given address via the
-- 
1.7.0