batman-adv: randomize initial seqno to avoid collision

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 117b8314e8c7..95bfc5962e1a 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;
+        uint32_t random_seqno;
+
+        /* randomize initial seqno to avoid collision */
+        get_random_bytes(&random_seqno, sizeof(random_seqno));
+        atomic_set(&hard_iface->seqno, random_seqno);
 
         hard_iface->packet_len = BATMAN_OGM_LEN;
         hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);