From 4f4c9430cf5ee1ca3567bc88faf8b4c18ed0bd13 Mon Sep 17 00:00:00 2001 From: Jan Engelhardt Date: Mon, 10 Mar 2008 16:42:40 -0700 Subject: [PATCH] [NETFILTER]: xt_time: fix failure to match on Sundays From: Andrew Schulman xt_time_match() in net/netfilter/xt_time.c in kernel 2.6.24 never matches on Sundays. On my host I have a rule like iptables -A OUTPUT -m time --weekdays Sun -j REJECT and it never matches. The problem is in localtime_2(), which uses r->weekday = (4 + r->dse) % 7; to map the epoch day onto a weekday in {0,...,6}. In particular this gives 0 for Sundays. But 0 has to be wrong; a weekday of 0 can never match. xt_time_match() has if (!(info->weekdays_match & (1 << current_time.weekday))) return false; and when current_time.weekday = 0, the result of the & is always zero, even when info->weekdays_match = XT_TIME_ALL_WEEKDAYS = 0xFE. Signed-off-by: Jan Engelhardt Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/netfilter/xt_time.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/net/netfilter/xt_time.c b/net/netfilter/xt_time.c index e9a8794bc3ab..9fa2e0824708 100644 --- a/net/netfilter/xt_time.c +++ b/net/netfilter/xt_time.c @@ -95,8 +95,11 @@ static inline void localtime_2(struct xtm *r, time_t time) */ r->dse = time / 86400; - /* 1970-01-01 (w=0) was a Thursday (4). */ - r->weekday = (4 + r->dse) % 7; + /* + * 1970-01-01 (w=0) was a Thursday (4). + * -1 and +1 map Sunday properly onto 7. + */ + r->weekday = (4 + r->dse - 1) % 7 + 1; } static void localtime_3(struct xtm *r, time_t time) -- GitLab