batman-adv: randomize initial seqno to avoid collision

Signed-off-by: Marek Lindner <[email protected]>
Signed-off-by: Antonio Quartulli <[email protected]>

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 117b8314e8c77a4c3bb6c833ce1c158037b5e89c..95bfc5962e1ad1881adc6e8a15677d2bc027dbe7 100644 (file)
--- 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);