140-netfilter_time.patch

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Index: linux-2.6.21.7/include/linux/netfilter_ipv4/ipt_time.h
===================================================================
--- /dev/null
+++ linux-2.6.21.7/include/linux/netfilter_ipv4/ipt_time.h
@@ -0,0 +1,18 @@
+#ifndef __ipt_time_h_included__
+#define __ipt_time_h_included__
+
+
+struct ipt_time_info {
+	u_int8_t  days_match;   /* 1 bit per day. -SMTWTFS                      */
+	u_int16_t time_start;   /* 0 < time_start < 23*60+59 = 1439             */
+	u_int16_t time_stop;    /* 0:0 < time_stat < 23:59                      */
+
+				/* FIXME: Keep this one for userspace iptables binary compability: */
+	u_int8_t  kerneltime;   /* ignore skb time (and use kerneltime) or not. */
+
+	time_t    date_start;
+	time_t    date_stop;
+};
+
+
+#endif /* __ipt_time_h_included__ */
Index: linux-2.6.21.7/net/ipv4/netfilter/ipt_time.c
===================================================================
--- /dev/null
+++ linux-2.6.21.7/net/ipv4/netfilter/ipt_time.c
@@ -0,0 +1,178 @@
+/*
+  This is a module which is used for time matching
+  It is using some modified code from dietlibc (localtime() function)
+  that you can find at http://www.fefe.de/dietlibc/
+  This file is distributed under the terms of the GNU General Public
+  License (GPL). Copies of the GPL can be obtained from: ftp://prep.ai.mit.edu/pub/gnu/GPL
+  2001-05-04 Fabrice MARIE <[e-mail]> : initial development.
+  2001-21-05 Fabrice MARIE <[e-mail]> : bug fix in the match code,
+     thanks to "Zeng Yu" <[e-mail]> for bug report.
+  2001-26-09 Fabrice MARIE <[e-mail]> : force the match to be in LOCAL_IN or PRE_ROUTING only.
+  2001-30-11 Fabrice : added the possibility to use the match in FORWARD/OUTPUT with a little hack,
+     added Nguyen Dang Phuoc Dong <[e-mail]> patch to support timezones.
+  2004-05-02 Fabrice : added support for date matching, from an idea of Fabien COELHO.
+*/
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_time.h>
+#include <linux/time.h>
+
+MODULE_AUTHOR("Fabrice MARIE <[e-mail]>");
+MODULE_DESCRIPTION("Match arrival timestamp/date");
+MODULE_LICENSE("GPL");
+
+struct tm
+{
+	int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
+	int tm_min;                   /* Minutes.     [0-59] */
+	int tm_hour;                  /* Hours.       [0-23] */
+	int tm_mday;                  /* Day.         [1-31] */
+	int tm_mon;                   /* Month.       [0-11] */
+	int tm_year;                  /* Year - 1900.  */
+	int tm_wday;                  /* Day of week. [0-6] */
+	int tm_yday;                  /* Days in year.[0-365] */
+	int tm_isdst;                 /* DST.         [-1/0/1]*/
+
+	long int tm_gmtoff;           /* we don't care, we count from GMT */
+	const char *tm_zone;          /* we don't care, we count from GMT */
+};
+
+void
+localtime(const u32 time, struct tm *r);
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const struct xt_match *match,
+      const void *matchinfo,
+      int offset,
+      unsigned int protoff,
+      int *hotdrop)
+{
+	const struct ipt_time_info *info = matchinfo;   /* match info for rule */
+	struct tm currenttime;                          /* time human readable */
+	u_int8_t days_of_week[7] = {64, 32, 16, 8, 4, 2, 1};
+	u_int16_t packet_time;
+
+	/* We might not have a timestamp, get one */
+	if (skb->tstamp.off_sec == 0)
+		__net_timestamp((struct sk_buff *)skb);
+
+	/* First we make sure we are in the date start-stop boundaries */
+	if ((skb->tstamp.off_sec < info->date_start) || (skb->tstamp.off_sec > info->date_stop))
+		return 0; /* We are outside the date boundaries */
+
+	/* Transform the timestamp of the packet, in a human readable form */
+	localtime(skb->tstamp.off_sec, &currenttime);
+
+	/* check if we match this timestamp, we start by the days... */
+	if ((days_of_week[currenttime.tm_wday] & info->days_match) != days_of_week[currenttime.tm_wday])
+		return 0; /* the day doesn't match */
+
+	/* ... check the time now */
+	packet_time = (currenttime.tm_hour * 60) + currenttime.tm_min;
+	if ((packet_time < info->time_start) || (packet_time > info->time_stop))
+		return 0;
+
+	/* here we match ! */
+	return 1;
+}
+
+static int
+checkentry(const char *tablename,
+           const void *ip,
+	   const struct xt_match *match,
+           void *matchinfo,
+           unsigned int hook_mask)
+{
+	struct ipt_time_info *info = matchinfo;   /* match info for rule */
+
+	/* First, check that we are in the correct hooks */
+	if (hook_mask
+            & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT)))
+	{
+		printk("ipt_time: error, only valid for PRE_ROUTING, LOCAL_IN, FORWARD and OUTPUT)\n");
+		return 0;
+	}
+
+	/* Now check the coherence of the data ... */
+	if ((info->time_start > 1439) ||        /* 23*60+59 = 1439*/
+	    (info->time_stop  > 1439))
+	{
+		printk(KERN_WARNING "ipt_time: invalid argument\n");
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_match time_match = {
+	.name = "time",
+	.match = &match,
+	.matchsize = sizeof(struct ipt_time_info),
+	.checkentry = &checkentry,
+	.me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+	printk("ipt_time loading\n");
+	return xt_register_match(&time_match);
+}
+
+static void __exit fini(void)
+{
+	xt_unregister_match(&time_match);
+	printk("ipt_time unloaded\n");
+}
+
+module_init(init);
+module_exit(fini);
+
+
+/* The part below is borowed and modified from dietlibc */
+
+/* seconds per day */
+#define SPD 24*60*60
+
+void
+localtime(const u32 time, struct tm *r) {
+	u32 i, timep;
+	extern struct timezone sys_tz;
+	const unsigned int __spm[12] =
+		{ 0,
+		  (31),
+		  (31+28),
+		  (31+28+31),
+		  (31+28+31+30),
+		  (31+28+31+30+31),
+		  (31+28+31+30+31+30),
+		  (31+28+31+30+31+30+31),
+		  (31+28+31+30+31+30+31+31),
+		  (31+28+31+30+31+30+31+31+30),
+		  (31+28+31+30+31+30+31+31+30+31),
+		  (31+28+31+30+31+30+31+31+30+31+30),
+		};
+	register u32 work;
+
+	timep = time - (sys_tz.tz_minuteswest * 60);
+	work=timep%(SPD);
+	r->tm_sec=work%60; work/=60;
+	r->tm_min=work%60; r->tm_hour=work/60;
+	work=timep/(SPD);
+	r->tm_wday=(4+work)%7;
+	for (i=1970; ; ++i) {
+		register time_t k= (!(i%4) && ((i%100) || !(i%400)))?366:365;
+		if (work>k)
+			work-=k;
+		else
+			break;
+	}
+	r->tm_year=i-1900;
+	for (i=11; i && __spm[i]>work; --i) ;
+	r->tm_mon=i;
+	r->tm_mday=work-__spm[i]+1;
+}
Index: linux-2.6.21.7/net/ipv4/netfilter/Kconfig
===================================================================
--- linux-2.6.21.7.orig/net/ipv4/netfilter/Kconfig
+++ linux-2.6.21.7/net/ipv4/netfilter/Kconfig
@@ -260,6 +260,22 @@ config IP_NF_MATCH_TOS
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+
+config IP_NF_MATCH_TIME
+	tristate  'TIME match support'
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a `time' match, which allows you
+	  to match based on the packet arrival time/date
+	  (arrival time/date at the machine which netfilter is running on) or
+	  departure time/date (for locally generated packets).
+
+	  If you say Y here, try iptables -m time --help for more information.
+	  If you want to compile it as a module, say M here and read
+
+	  Documentation/modules.txt.  If unsure, say `N'.
+
+
 config IP_NF_MATCH_RECENT
 	tristate "recent match support"
 	depends on IP_NF_IPTABLES
Index: linux-2.6.21.7/net/ipv4/netfilter/Makefile
===================================================================
--- linux-2.6.21.7.orig/net/ipv4/netfilter/Makefile
+++ linux-2.6.21.7/net/ipv4/netfilter/Makefile
@@ -86,6 +86,7 @@ obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
 obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o
 obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
 obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
+obj-$(CONFIG_IP_NF_MATCH_TIME) += ipt_time.o
 obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
 obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o