netdev - [PATCH 03/11] batman-adv: randomize initial seqno to avoid collision

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Date:	Tue, 17 Apr 2012 13:58:19 +0200
From:	Antonio Quartulli <ordex@...istici.org>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org,
	Marek Lindner <lindner_marek@...oo.de>,
	Antonio Quartulli <ordex@...istici.org>
Subject: [PATCH 03/11] batman-adv: randomize initial seqno to avoid collision

From: Marek Lindner <lindner_marek@...oo.de>

Signed-off-by: Marek Lindner <lindner_marek@...oo.de>
Signed-off-by: Antonio Quartulli <ordex@...istici.org>
---
 net/batman-adv/bat_iv_ogm.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 117b831..4661bd4 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -33,6 +33,11 @@
 static void bat_iv_ogm_iface_enable(struct hard_iface *hard_iface)
 {
 	struct batman_ogm_packet *batman_ogm_packet;
+	unsigned long random_seqno;
+
+	/* randomize initial seqno to avoid collision */
+	get_random_bytes(&random_seqno, sizeof(unsigned long));
+	atomic_set(&hard_iface->seqno, (uint32_t)random_seqno);
 
 	hard_iface->packet_len = BATMAN_OGM_LEN;
 	hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
-- 
1.7.9.4

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