Re: [B.A.T.M.A.N.] [PATCH 3/8] batman-adv: randomize initial seqno to avoid collision

On Tue, Feb 07, 2012 at 05:20:46PM +0800, Marek Lindner wrote:

Signed-off-by: Marek Lindner lindner_marek@yahoo.de

bat_iv_ogm.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index 3eff7f0..4ac2d1d 100644 --- a/bat_iv_ogm.c +++ b/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);

Hi Marek

Does this sequence number have any security relevance? Does it make sense to use the TCP sequence number generation code?

Andrew