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netfilter: slightly optimize nf_inet_addr_mask
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using 64bit computation to slightly optimize nf_inet_addr_mask

Signed-off-by: Li RongQing <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
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lrq-max authored and ummakynes committed May 5, 2019
1 parent eabb478 commit 522e407
Showing 1 changed file with 9 additions and 0 deletions.
9 changes: 9 additions & 0 deletions include/linux/netfilter.h
Original file line number Diff line number Diff line change
Expand Up @@ -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);
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