target/linux/generic-2.4/patches/617-netfilter_time.patch

   1 diff -urN linux-2.4.32.orig/net/ipv4/netfilter/Config.in linux-2.4.32/net/ipv4/netfilter/Config.in
   2 --- linux-2.4.32.orig/net/ipv4/netfilter/Config.in      2006-01-07 12:11:37.000000000 +0100
   3 +++ linux-2.4.32/net/ipv4/netfilter/Config.in   2006-01-07 12:15:45.000000000 +0100
   4 @@ -48,6 +48,7 @@
   5    dep_tristate '  netfilter MARK match support' CONFIG_IP_NF_MATCH_MARK $CONFIG_IP_NF_IPTABLES
   6    dep_tristate '  Multiple port match support' CONFIG_IP_NF_MATCH_MULTIPORT $CONFIG_IP_NF_IPTABLES
   7    dep_tristate '  TOS match support' CONFIG_IP_NF_MATCH_TOS $CONFIG_IP_NF_IPTABLES
   8 +  dep_tristate '  TIME match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_TIME $CONFIG_IP_NF_IPTABLES
   9    dep_tristate '  condition match support' CONFIG_IP_NF_MATCH_CONDITION $CONFIG_IP_NF_IPTABLES
  10    dep_tristate '  recent match support' CONFIG_IP_NF_MATCH_RECENT $CONFIG_IP_NF_IPTABLES
  11    dep_tristate '  ECN match support' CONFIG_IP_NF_MATCH_ECN $CONFIG_IP_NF_IPTABLES
  12 diff -urN linux-2.4.32.orig/net/ipv4/netfilter/ipt_time.c linux-2.4.32/net/ipv4/netfilter/ipt_time.c
  13 --- linux-2.4.32.orig/net/ipv4/netfilter/ipt_time.c     1970-01-01 01:00:00.000000000 +0100
  14 +++ linux-2.4.32/net/ipv4/netfilter/ipt_time.c  2006-01-07 12:14:32.000000000 +0100
  15 @@ -0,0 +1,193 @@
  16 +/*
  17 +  This is a module which is used for time matching
  18 +  It is using some modified code from dietlibc (localtime() function)
  19 +  that you can find at http://www.fefe.de/dietlibc/
  20 +  This file is distributed under the terms of the GNU General Public
  21 +  License (GPL). Copies of the GPL can be obtained from: ftp://prep.ai.mit.edu/pub/gnu/GPL
  22 +  2001-05-04 Fabrice MARIE <fabrice@netfilter.org> : initial development.
  23 +  2001-21-05 Fabrice MARIE <fabrice@netfilter.org> : bug fix in the match code,
  24 +     thanks to "Zeng Yu" <zengy@capitel.com.cn> for bug report.
  25 +  2001-26-09 Fabrice MARIE <fabrice@netfilter.org> : force the match to be in LOCAL_IN or PRE_ROUTING only.
  26 +  2001-30-11 Fabrice : added the possibility to use the match in FORWARD/OUTPUT with a little hack,
  27 +     added Nguyen Dang Phuoc Dong <dongnd@tlnet.com.vn> patch to support timezones.
  28 +  2004-05-02 Fabrice : added support for date matching, from an idea of Fabien COELHO.
  29 +*/
  30 +
  31 +#include <linux/module.h>
  32 +#include <linux/skbuff.h>
  33 +#include <linux/netfilter_ipv4/ip_tables.h>
  34 +#include <linux/netfilter_ipv4/ipt_time.h>
  35 +#include <linux/time.h>
  36 +
  37 +MODULE_AUTHOR("Fabrice MARIE <fabrice@netfilter.org>");
  38 +MODULE_DESCRIPTION("Match arrival timestamp/date");
  39 +MODULE_LICENSE("GPL");
  40 +
  41 +struct tm
  42 +{
  43 +       int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
  44 +       int tm_min;                   /* Minutes.     [0-59] */
  45 +       int tm_hour;                  /* Hours.       [0-23] */
  46 +       int tm_mday;                  /* Day.         [1-31] */
  47 +       int tm_mon;                   /* Month.       [0-11] */
  48 +       int tm_year;                  /* Year - 1900.  */
  49 +       int tm_wday;                  /* Day of week. [0-6] */
  50 +       int tm_yday;                  /* Days in year.[0-365] */
  51 +       int tm_isdst;                 /* DST.         [-1/0/1]*/
  52 +
  53 +       long int tm_gmtoff;           /* we don't care, we count from GMT */
  54 +       const char *tm_zone;          /* we don't care, we count from GMT */
  55 +};
  56 +
  57 +void
  58 +localtime(const time_t *timepr, struct tm *r);
  59 +
  60 +static int
  61 +match(const struct sk_buff *skb,
  62 +      const struct net_device *in,
  63 +      const struct net_device *out,
  64 +      const void *matchinfo,
  65 +      int offset,
  66 +      const void *hdr,
  67 +      u_int16_t datalen,
  68 +      int *hotdrop)
  69 +{
  70 +       const struct ipt_time_info *info = matchinfo;   /* match info for rule */
  71 +       struct tm currenttime;                          /* time human readable */
  72 +       u_int8_t days_of_week[7] = {64, 32, 16, 8, 4, 2, 1};
  73 +       u_int16_t packet_time;
  74 +       struct timeval kerneltimeval;
  75 +       time_t packet_local_time;
  76 +
  77 +       /* if kerneltime=1, we don't read the skb->timestamp but kernel time instead */
  78 +       if (info->kerneltime)
  79 +       {
  80 +               do_gettimeofday(&kerneltimeval);
  81 +               packet_local_time = kerneltimeval.tv_sec;
  82 +       }
  83 +       else
  84 +               packet_local_time = skb->stamp.tv_sec;
  85 +
  86 +       /* First we make sure we are in the date start-stop boundaries */
  87 +       if ((packet_local_time < info->date_start) || (packet_local_time > info->date_stop))
  88 +               return 0; /* We are outside the date boundaries */
  89 +
  90 +       /* Transform the timestamp of the packet, in a human readable form */
  91 +       localtime(&packet_local_time, &currenttime);
  92 +
  93 +       /* check if we match this timestamp, we start by the days... */
  94 +       if ((days_of_week[currenttime.tm_wday] & info->days_match) != days_of_week[currenttime.tm_wday])
  95 +               return 0; /* the day doesn't match */
  96 +
  97 +       /* ... check the time now */
  98 +       packet_time = (currenttime.tm_hour * 60) + currenttime.tm_min;
  99 +       if ((packet_time < info->time_start) || (packet_time > info->time_stop))
 100 +               return 0;
 101 +
 102 +       /* here we match ! */
 103 +       return 1;
 104 +}
 105 +
 106 +static int
 107 +checkentry(const char *tablename,
 108 +           const struct ipt_ip *ip,
 109 +           void *matchinfo,
 110 +           unsigned int matchsize,
 111 +           unsigned int hook_mask)
 112 +{
 113 +       struct ipt_time_info *info = matchinfo;   /* match info for rule */
 114 +
 115 +       /* First, check that we are in the correct hooks */
 116 +       if (hook_mask
 117 +            & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT)))
 118 +       {
 119 +               printk("ipt_time: error, only valid for PRE_ROUTING, LOCAL_IN, FORWARD and OUTPUT)\n");
 120 +               return 0;
 121 +       }
 122 +       /* we use the kerneltime if we are in forward or output */
 123 +       info->kerneltime = 1;
 124 +       if (hook_mask & ~((1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT)))
 125 +               /* we use the skb time */
 126 +               info->kerneltime = 0;
 127 +
 128 +       /* Check the size */
 129 +       if (matchsize != IPT_ALIGN(sizeof(struct ipt_time_info)))
 130 +               return 0;
 131 +       /* Now check the coherence of the data ... */
 132 +       if ((info->time_start > 1439) ||        /* 23*60+59 = 1439*/
 133 +           (info->time_stop  > 1439))
 134 +       {
 135 +               printk(KERN_WARNING "ipt_time: invalid argument\n");
 136 +               return 0;
 137 +       }
 138 +
 139 +       return 1;
 140 +}
 141 +
 142 +static struct ipt_match time_match = {
 143 +       .name           = "time",
 144 +       .match          = match,
 145 +       .checkentry     = checkentry,
 146 +       .me             = THIS_MODULE,
 147 +};
 148 +
 149 +static int __init init(void)
 150 +{
 151 +       printk("ipt_time loading\n");
 152 +       return ipt_register_match(&time_match);
 153 +}
 154 +
 155 +static void __exit fini(void)
 156 +{
 157 +       ipt_unregister_match(&time_match);
 158 +       printk("ipt_time unloaded\n");
 159 +}
 160 +
 161 +module_init(init);
 162 +module_exit(fini);
 163 +
 164 +
 165 +/* The part below is borowed and modified from dietlibc */
 166 +
 167 +/* seconds per day */
 168 +#define SPD 24*60*60
 169 +
 170 +void
 171 +localtime(const time_t *timepr, struct tm *r) {
 172 +       time_t i;
 173 +       time_t timep;
 174 +       extern struct timezone sys_tz;
 175 +       const unsigned int __spm[12] =
 176 +               { 0,
 177 +                 (31),
 178 +                 (31+28),
 179 +                 (31+28+31),
 180 +                 (31+28+31+30),
 181 +                 (31+28+31+30+31),
 182 +                 (31+28+31+30+31+30),
 183 +                 (31+28+31+30+31+30+31),
 184 +                 (31+28+31+30+31+30+31+31),
 185 +                 (31+28+31+30+31+30+31+31+30),
 186 +                 (31+28+31+30+31+30+31+31+30+31),
 187 +                 (31+28+31+30+31+30+31+31+30+31+30),
 188 +               };
 189 +       register time_t work;
 190 +
 191 +       timep = (*timepr) - (sys_tz.tz_minuteswest * 60);
 192 +       work=timep%(SPD);
 193 +       r->tm_sec=work%60; work/=60;
 194 +       r->tm_min=work%60; r->tm_hour=work/60;
 195 +       work=timep/(SPD);
 196 +       r->tm_wday=(4+work)%7;
 197 +       for (i=1970; ; ++i) {
 198 +               register time_t k= (!(i%4) && ((i%100) || !(i%400)))?366:365;
 199 +               if (work>k)
 200 +                       work-=k;
 201 +               else
 202 +                       break;
 203 +       }
 204 +       r->tm_year=i-1900;
 205 +       for (i=11; i && __spm[i]>work; --i) ;
 206 +       r->tm_mon=i;
 207 +       r->tm_mday=work-__spm[i]+1;
 208 +}
 209 diff -urN linux-2.4.32.orig/net/ipv4/netfilter/Makefile linux-2.4.32/net/ipv4/netfilter/Makefile
 210 --- linux-2.4.32.orig/net/ipv4/netfilter/Makefile       2006-01-07 12:11:37.000000000 +0100
 211 +++ linux-2.4.32/net/ipv4/netfilter/Makefile    2006-01-07 12:16:07.000000000 +0100
 212 @@ -118,6 +118,7 @@
 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_CONDITION) += ipt_condition.o
 218
 219  obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 220 diff -urN linux-2.4.32.orig/include/linux/netfilter_ipv4/ipt_time.h linux-2.4.32/include/linux/netfilter_ipv4/ipt_time.h
 221 --- linux-2.4.32.orig/include/linux/netfilter_ipv4/ipt_time.h   1970-01-01 01:00:00.000000000 +0100
 222 +++ linux-2.4.32/include/linux/netfilter_ipv4/ipt_time.h        2006-01-07 12:16:42.000000000 +0100
 223 @@ -0,0 +1,15 @@
 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 +       u_int8_t  kerneltime;   /* ignore skb time (and use kerneltime) or not. */
 233 +       time_t    date_start;
 234 +       time_t    date_stop;
 235 +};
 236 +
 237 +
 238 +#endif /* __ipt_time_h_included__ */