openwrt/target/linux/generic-2.6/patches/105-netfilter_time.patch

   1 diff -urN linux-2.6.15-rc6.orig/net/ipv4/netfilter/ipt_time.c linux-2.6.15-rc6/net/ipv4/netfilter/ipt_time.c
   2 --- linux-2.6.15-rc6.orig/net/ipv4/netfilter/ipt_time.c 1970-01-01 01:00:00.000000000 +0100
   3 +++ linux-2.6.15-rc6/net/ipv4/netfilter/ipt_time.c      2006-01-07 13:02:59.000000000 +0100
   4 @@ -0,0 +1,178 @@
   5 +/*
   6 +  This is a module which is used for time matching
   7 +  It is using some modified code from dietlibc (localtime() function)
   8 +  that you can find at http://www.fefe.de/dietlibc/
   9 +  This file is distributed under the terms of the GNU General Public
  10 +  License (GPL). Copies of the GPL can be obtained from: ftp://prep.ai.mit.edu/pub/gnu/GPL
  11 +  2001-05-04 Fabrice MARIE <fabrice@netfilter.org> : initial development.
  12 +  2001-21-05 Fabrice MARIE <fabrice@netfilter.org> : bug fix in the match code,
  13 +     thanks to "Zeng Yu" <zengy@capitel.com.cn> for bug report.
  14 +  2001-26-09 Fabrice MARIE <fabrice@netfilter.org> : force the match to be in LOCAL_IN or PRE_ROUTING only.
  15 +  2001-30-11 Fabrice : added the possibility to use the match in FORWARD/OUTPUT with a little hack,
  16 +     added Nguyen Dang Phuoc Dong <dongnd@tlnet.com.vn> patch to support timezones.
  17 +  2004-05-02 Fabrice : added support for date matching, from an idea of Fabien COELHO.
  18 +*/
  19 +
  20 +#include <linux/module.h>
  21 +#include <linux/skbuff.h>
  22 +#include <linux/netfilter_ipv4/ip_tables.h>
  23 +#include <linux/netfilter_ipv4/ipt_time.h>
  24 +#include <linux/time.h>
  25 +
  26 +MODULE_AUTHOR("Fabrice MARIE <fabrice@netfilter.org>");
  27 +MODULE_DESCRIPTION("Match arrival timestamp/date");
  28 +MODULE_LICENSE("GPL");
  29 +
  30 +struct tm
  31 +{
  32 +       int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
  33 +       int tm_min;                   /* Minutes.     [0-59] */
  34 +       int tm_hour;                  /* Hours.       [0-23] */
  35 +       int tm_mday;                  /* Day.         [1-31] */
  36 +       int tm_mon;                   /* Month.       [0-11] */
  37 +       int tm_year;                  /* Year - 1900.  */
  38 +       int tm_wday;                  /* Day of week. [0-6] */
  39 +       int tm_yday;                  /* Days in year.[0-365] */
  40 +       int tm_isdst;                 /* DST.         [-1/0/1]*/
  41 +
  42 +       long int tm_gmtoff;           /* we don't care, we count from GMT */
  43 +       const char *tm_zone;          /* we don't care, we count from GMT */
  44 +};
  45 +
  46 +void
  47 +localtime(const u32 time, struct tm *r);
  48 +
  49 +static int
  50 +match(const struct sk_buff *skb,
  51 +      const struct net_device *in,
  52 +      const struct net_device *out,
  53 +      const void *matchinfo,
  54 +      int offset,
  55 +      int *hotdrop)
  56 +{
  57 +       const struct ipt_time_info *info = matchinfo;   /* match info for rule */
  58 +       struct tm currenttime;                          /* time human readable */
  59 +       u_int8_t days_of_week[7] = {64, 32, 16, 8, 4, 2, 1};
  60 +       u_int16_t packet_time;
  61 +
  62 +       /* We might not have a timestamp, get one */
  63 +       if (skb->tstamp.off_sec == 0)
  64 +               __net_timestamp((struct sk_buff *)skb);
  65 +
  66 +       /* First we make sure we are in the date start-stop boundaries */
  67 +       if ((skb->tstamp.off_sec < info->date_start) || (skb->tstamp.off_sec > info->date_stop))
  68 +               return 0; /* We are outside the date boundaries */
  69 +
  70 +       /* Transform the timestamp of the packet, in a human readable form */
  71 +       localtime(skb->tstamp.off_sec, &currenttime);
  72 +
  73 +       /* check if we match this timestamp, we start by the days... */
  74 +       if ((days_of_week[currenttime.tm_wday] & info->days_match) != days_of_week[currenttime.tm_wday])
  75 +               return 0; /* the day doesn't match */
  76 +
  77 +       /* ... check the time now */
  78 +       packet_time = (currenttime.tm_hour * 60) + currenttime.tm_min;
  79 +       if ((packet_time < info->time_start) || (packet_time > info->time_stop))
  80 +               return 0;
  81 +
  82 +       /* here we match ! */
  83 +       return 1;
  84 +}
  85 +
  86 +static int
  87 +checkentry(const char *tablename,
  88 +           const struct ipt_ip *ip,
  89 +           void *matchinfo,
  90 +           unsigned int matchsize,
  91 +           unsigned int hook_mask)
  92 +{
  93 +       struct ipt_time_info *info = matchinfo;   /* match info for rule */
  94 +
  95 +       /* First, check that we are in the correct hooks */
  96 +       if (hook_mask
  97 +            & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT)))
  98 +       {
  99 +               printk("ipt_time: error, only valid for PRE_ROUTING, LOCAL_IN, FORWARD and OUTPUT)\n");
 100 +               return 0;
 101 +       }
 102 +
 103 +       /* Check the size */
 104 +       if (matchsize != IPT_ALIGN(sizeof(struct ipt_time_info)))
 105 +               return 0;
 106 +       /* Now check the coherence of the data ... */
 107 +       if ((info->time_start > 1439) ||        /* 23*60+59 = 1439*/
 108 +           (info->time_stop  > 1439))
 109 +       {
 110 +               printk(KERN_WARNING "ipt_time: invalid argument\n");
 111 +               return 0;
 112 +       }
 113 +
 114 +       return 1;
 115 +}
 116 +
 117 +static struct ipt_match time_match = {
 118 +       .name = "time",
 119 +       .match = &match,
 120 +       .checkentry = &checkentry,
 121 +       .me = THIS_MODULE
 122 +};
 123 +
 124 +static int __init init(void)
 125 +{
 126 +       printk("ipt_time loading\n");
 127 +       return ipt_register_match(&time_match);
 128 +}
 129 +
 130 +static void __exit fini(void)
 131 +{
 132 +       ipt_unregister_match(&time_match);
 133 +       printk("ipt_time unloaded\n");
 134 +}
 135 +
 136 +module_init(init);
 137 +module_exit(fini);
 138 +
 139 +
 140 +/* The part below is borowed and modified from dietlibc */
 141 +
 142 +/* seconds per day */
 143 +#define SPD 24*60*60
 144 +
 145 +void
 146 +localtime(const u32 time, struct tm *r) {
 147 +       u32 i, timep;
 148 +       extern struct timezone sys_tz;
 149 +       const unsigned int __spm[12] =
 150 +               { 0,
 151 +                 (31),
 152 +                 (31+28),
 153 +                 (31+28+31),
 154 +                 (31+28+31+30),
 155 +                 (31+28+31+30+31),
 156 +                 (31+28+31+30+31+30),
 157 +                 (31+28+31+30+31+30+31),
 158 +                 (31+28+31+30+31+30+31+31),
 159 +                 (31+28+31+30+31+30+31+31+30),
 160 +                 (31+28+31+30+31+30+31+31+30+31),
 161 +                 (31+28+31+30+31+30+31+31+30+31+30),
 162 +               };
 163 +       register u32 work;
 164 +
 165 +       timep = time - (sys_tz.tz_minuteswest * 60);
 166 +       work=timep%(SPD);
 167 +       r->tm_sec=work%60; work/=60;
 168 +       r->tm_min=work%60; r->tm_hour=work/60;
 169 +       work=timep/(SPD);
 170 +       r->tm_wday=(4+work)%7;
 171 +       for (i=1970; ; ++i) {
 172 +               register time_t k= (!(i%4) && ((i%100) || !(i%400)))?366:365;
 173 +               if (work>k)
 174 +                       work-=k;
 175 +               else
 176 +                       break;
 177 +       }
 178 +       r->tm_year=i-1900;
 179 +       for (i=11; i && __spm[i]>work; --i) ;
 180 +       r->tm_mon=i;
 181 +       r->tm_mday=work-__spm[i]+1;
 182 +}
 183 diff -urN linux-2.6.15-rc6.orig/net/ipv4/netfilter/Kconfig linux-2.6.15-rc6/net/ipv4/netfilter/Kconfig
 184 --- linux-2.6.15-rc6.orig/net/ipv4/netfilter/Kconfig    2006-01-07 13:00:21.000000000 +0100
 185 +++ linux-2.6.15-rc6/net/ipv4/netfilter/Kconfig 2006-01-07 13:05:07.000000000 +0100
 186 @@ -278,6 +278,22 @@
 187
 188           To compile it as a module, choose M here.  If unsure, say N.
 189
 190 +
 191 +config IP_NF_MATCH_TIME
 192 +       tristate  'TIME match support'
 193 +       depends on IP_NF_IPTABLES
 194 +       help
 195 +         This option adds a `time' match, which allows you
 196 +         to match based on the packet arrival time/date
 197 +         (arrival time/date at the machine which netfilter is running on) or
 198 +         departure time/date (for locally generated packets).
 199 +
 200 +         If you say Y here, try iptables -m time --help for more information.
 201 +         If you want to compile it as a module, say M here and read
 202 +
 203 +         Documentation/modules.txt.  If unsure, say `N'.
 204 +
 205 +
 206  config IP_NF_MATCH_RECENT
 207         tristate "recent match support"
 208         depends on IP_NF_IPTABLES
 209 diff -urN linux-2.6.15-rc6.orig/net/ipv4/netfilter/Makefile linux-2.6.15-rc6/net/ipv4/netfilter/Makefile
 210 --- linux-2.6.15-rc6.orig/net/ipv4/netfilter/Makefile   2006-01-07 13:00:21.000000000 +0100
 211 +++ linux-2.6.15-rc6/net/ipv4/netfilter/Makefile        2006-01-07 13:03:50.000000000 +0100
 212 @@ -58,6 +58,7 @@
 213  obj-$(CONFIG_IP_NF_MATCH_MULTIPORT) += ipt_multiport.o
 214  obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
 215  obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
 216 +obj-$(CONFIG_IP_NF_MATCH_TIME) += ipt_time.o
 217  obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 218  obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
 219  obj-$(CONFIG_IP_NF_MATCH_DSCP) += ipt_dscp.o
 220 diff -urN linux-2.6.15-rc6.orig/include/linux/netfilter_ipv4/ipt_time.h linux-2.6.15-rc6/include/linux/netfilter_ipv4/ipt_time.h
 221 --- linux-2.6.15-rc6.orig/include/linux/netfilter_ipv4/ipt_time.h       1970-01-01 01:00:00.000000000 +0100
 222 +++ linux-2.6.15-rc6/include/linux/netfilter_ipv4/ipt_time.h    2006-01-07 13:02:14.000000000 +0100
 223 @@ -0,0 +1,18 @@
 224 +#ifndef __ipt_time_h_included__
 225 +#define __ipt_time_h_included__
 226 +
 227 +
 228 +struct ipt_time_info {
 229 +       u_int8_t  days_match;   /* 1 bit per day. -SMTWTFS                      */
 230 +       u_int16_t time_start;   /* 0 < time_start < 23*60+59 = 1439             */
 231 +       u_int16_t time_stop;    /* 0:0 < time_stat < 23:59                      */
 232 +
 233 +                               /* FIXME: Keep this one for userspace iptables binary compability: */
 234 +       u_int8_t  kerneltime;   /* ignore skb time (and use kerneltime) or not. */
 235 +
 236 +       time_t    date_start;
 237 +       time_t    date_stop;
 238 +};
 239 +
 240 +
 241 +#endif /* __ipt_time_h_included__ */