netfilter: xt_NFQUEUE: remove modulo operations

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/netfilter/xt_NFQUEUE.c b/net/netfilter/xt_NFQUEUE.c
index 039cce1bde3d..39627706aac6 100644
--- a/net/netfilter/xt_NFQUEUE.c
+++ b/net/netfilter/xt_NFQUEUE.c
@@ -72,10 +72,12 @@ nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
 
         if (info->queues_total > 1) {
                 if (par->family == NFPROTO_IPV4)
-                        queue = hash_v4(skb) % info->queues_total + queue;
+                        queue = (((u64) hash_v4(skb) * info->queues_total) >>
+                                 32) + queue;
 #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
                 else if (par->family == NFPROTO_IPV6)
-                        queue = hash_v6(skb) % info->queues_total + queue;
+                        queue = (((u64) hash_v6(skb) * info->queues_total) >>
+                                 32) + queue;
 #endif
         }
         return NF_QUEUE_NR(queue);