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netfilter: xt_time: use is_leap_year() helper

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Use the is_leap_year() helper from rtc.h instead of
writing it by hand

Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Jinjie Ruan 2026-01-23 16:10:51 +08:00 • committed by Florian Westphal
parent 5e51803521
commit 77fd1b4c6e
1 changed files with 2 additions and 6 deletions
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8
net/netfilter/xt_time.c
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@ -14,6 +14,7 @@
#include <linux/ktime.h>
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/netfilter/x_tables.h>
@ -64,11 +65,6 @@ static const u_int16_t days_since_epoch[] = {
3287, 2922, 2557, 2191, 1826, 1461, 1096, 730, 365, 0,
};
static inline bool is_leap(unsigned int y)
{
return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);
}
/*
* Each network packet has a (nano)seconds-since-the-epoch (SSTE) timestamp.
* Since we match against days and daytime, the SSTE value needs to be
@ -138,7 +134,7 @@ static void localtime_3(struct xtm *r, time64_t time)
* (A different approach to use would be to subtract a monthlength
* from w repeatedly while counting.)
*/
if (is_leap(year)) {
if (is_leap_year(year)) {
/* use days_since_leapyear[] in a leap year */
for (i = ARRAY_SIZE(days_since_leapyear) - 1;
i > 0 && days_since_leapyear[i] > w; --i)