netfilter: slightly optimize nf_inet_addr_mask

using 64bit computation to slightly optimize nf_inet_addr_mask

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index a7252f3..996bc24 100644 (file)
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -41,10 +41,19 @@ static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
                                     union nf_inet_addr *result,
                                     const union nf_inet_addr *mask)
 {
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+       const unsigned long *ua = (const unsigned long *)a1;
+       unsigned long *ur = (unsigned long *)result;
+       const unsigned long *um = (const unsigned long *)mask;
+
+       ur[0] = ua[0] & um[0];
+       ur[1] = ua[1] & um[1];
+#else
        result->all[0] = a1->all[0] & mask->all[0];
        result->all[1] = a1->all[1] & mask->all[1];
        result->all[2] = a1->all[2] & mask->all[2];
        result->all[3] = a1->all[3] & mask->all[3];
+#endif
 }
 
 int netfilter_init(void);