From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 14 Mar 2013 06:03:17 +0000 (+0000)
Subject: netfilter: nfnetlink_queue: use xor hash function to distribute instances
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1cdb09056b27b2a06b06dc7187d2c33d57082d20;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

netfilter: nfnetlink_queue: use xor hash function to distribute instances

Thanks to Eric Dumazet for suggesting this during the NFWS.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index 858fd52c1040..350c50fbfd4d 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -73,7 +73,7 @@ static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
 
 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
 {
-	return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
+	return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
 }
 
 static struct nfqnl_instance *