From 54eb3df3a7d01b6cd395bdc1098280f2f93fbec5 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Mon, 17 Sep 2012 00:23:09 +0000 Subject: netfilter: xt_time: add support to ignore day transition Currently, if you want to do something like: "match Monday, starting 23:00, for two hours" You need two rules, one for Mon 23:00 to 0:00 and one for Tue 0:00-1:00. The rule: --weekdays Mo --timestart 23:00 --timestop 01:00 looks correct, but it will first match on monday from midnight to 1 a.m. and then again for another hour from 23:00 onwards. This permits userspace to explicitly ignore the day transition and match for a single, continuous time period instead. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/xt_time.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) (limited to 'net/netfilter/xt_time.c') diff --git a/net/netfilter/xt_time.c b/net/netfilter/xt_time.c index c48975ff8ea2..0ae55a36f492 100644 --- a/net/netfilter/xt_time.c +++ b/net/netfilter/xt_time.c @@ -42,6 +42,7 @@ static const u_int16_t days_since_leapyear[] = { */ enum { DSE_FIRST = 2039, + SECONDS_PER_DAY = 86400, }; static const u_int16_t days_since_epoch[] = { /* 2039 - 2030 */ @@ -78,7 +79,7 @@ static inline unsigned int localtime_1(struct xtm *r, time_t time) unsigned int v, w; /* Each day has 86400s, so finding the hour/minute is actually easy. */ - v = time % 86400; + v = time % SECONDS_PER_DAY; r->second = v % 60; w = v / 60; r->minute = w % 60; @@ -199,6 +200,18 @@ time_mt(const struct sk_buff *skb, struct xt_action_param *par) if (packet_time < info->daytime_start && packet_time > info->daytime_stop) return false; + + /** if user asked to ignore 'next day', then e.g. + * '1 PM Wed, August 1st' should be treated + * like 'Tue 1 PM July 31st'. + * + * This also causes + * 'Monday, "23:00 to 01:00", to match for 2 hours, starting + * Monday 23:00 to Tuesday 01:00. + */ + if ((info->flags & XT_TIME_CONTIGUOUS) && + packet_time <= info->daytime_stop) + stamp -= SECONDS_PER_DAY; } localtime_2(¤t_time, stamp); @@ -227,6 +240,15 @@ static int time_mt_check(const struct xt_mtchk_param *par) return -EDOM; } + if (info->flags & ~XT_TIME_ALL_FLAGS) { + pr_info("unknown flags 0x%x\n", info->flags & ~XT_TIME_ALL_FLAGS); + return -EINVAL; + } + + if ((info->flags & XT_TIME_CONTIGUOUS) && + info->daytime_start < info->daytime_stop) + return -EINVAL; + return 0; } -- cgit v1.2.3-59-g8ed1b