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netfilter: optimize nf_inet_addr_cmp

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optimize nf_inet_addr_cmp by 64bit xor computation
similar to ipv6_addr_equal()

Signed-off-by: Yuan Linsi <yuanlinsi01@baidu.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Li RongQing 2019-03-26 20:06:20 +08:00 committed by Pablo Neira Ayuso
parent 84c0d5e96f
commit 01902f8c85
1 changed files with 7 additions and 0 deletions
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7
include/linux/netfilter.h
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@ -24,10 +24,17 @@ static inline int NF_DROP_GETERR(int verdict)
static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
const union nf_inet_addr *a2)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
const unsigned long *ul1 = (const unsigned long *)a1;
const unsigned long *ul2 = (const unsigned long *)a2;
return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
#else
return a1->all[0] == a2->all[0] &&
a1->all[1] == a2->all[1] &&
a1->all[2] == a2->all[2] &&
a1->all[3] == a2->all[3];
#endif
}
static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,