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

   1 Index: linux-2.4.35.4/net/ipv4/netfilter/Config.in
   2 ===================================================================
   3 --- linux-2.4.35.4.orig/net/ipv4/netfilter/Config.in    2007-12-15 05:20:10.812456409 +0100
   4 +++ linux-2.4.35.4/net/ipv4/netfilter/Config.in 2007-12-15 05:20:11.208478976 +0100
   5 @@ -47,6 +47,7 @@
   6    dep_tristate '  netfilter MARK match support' CONFIG_IP_NF_MATCH_MARK $CONFIG_IP_NF_IPTABLES
   7    dep_tristate '  Multiple port match support' CONFIG_IP_NF_MATCH_MULTIPORT $CONFIG_IP_NF_IPTABLES
   8    dep_tristate '  TOS match support' CONFIG_IP_NF_MATCH_TOS $CONFIG_IP_NF_IPTABLES
   9 +  dep_tristate '  TIME match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_TIME $CONFIG_IP_NF_IPTABLES
  10    dep_tristate '  condition match support' CONFIG_IP_NF_MATCH_CONDITION $CONFIG_IP_NF_IPTABLES
  11    dep_tristate '  recent match support' CONFIG_IP_NF_MATCH_RECENT $CONFIG_IP_NF_IPTABLES
  12    dep_tristate '  ECN match support' CONFIG_IP_NF_MATCH_ECN $CONFIG_IP_NF_IPTABLES
  13 Index: linux-2.4.35.4/net/ipv4/netfilter/ipt_time.c
  14 ===================================================================
  15 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  16 +++ linux-2.4.35.4/net/ipv4/netfilter/ipt_time.c        2007-12-15 05:20:11.212479205 +0100
  17 @@ -0,0 +1,193 @@
  18 +/*
  19 +  This is a module which is used for time matching
  20 +  It is using some modified code from dietlibc (localtime() function)
  21 +  that you can find at http://www.fefe.de/dietlibc/
  22 +  This file is distributed under the terms of the GNU General Public
  23 +  License (GPL). Copies of the GPL can be obtained from: ftp://prep.ai.mit.edu/pub/gnu/GPL
  24 +  2001-05-04 Fabrice MARIE <fabrice@netfilter.org> : initial development.
  25 +  2001-21-05 Fabrice MARIE <fabrice@netfilter.org> : bug fix in the match code,
  26 +     thanks to "Zeng Yu" <zengy@capitel.com.cn> for bug report.
  27 +  2001-26-09 Fabrice MARIE <fabrice@netfilter.org> : force the match to be in LOCAL_IN or PRE_ROUTING only.
  28 +  2001-30-11 Fabrice : added the possibility to use the match in FORWARD/OUTPUT with a little hack,
  29 +     added Nguyen Dang Phuoc Dong <dongnd@tlnet.com.vn> patch to support timezones.
  30 +  2004-05-02 Fabrice : added support for date matching, from an idea of Fabien COELHO.
  31 +*/
  32 +
  33 +#include <linux/module.h>
  34 +#include <linux/skbuff.h>
  35 +#include <linux/netfilter_ipv4/ip_tables.h>
  36 +#include <linux/netfilter_ipv4/ipt_time.h>
  37 +#include <linux/time.h>
  38 +
  39 +MODULE_AUTHOR("Fabrice MARIE <fabrice@netfilter.org>");
  40 +MODULE_DESCRIPTION("Match arrival timestamp/date");
  41 +MODULE_LICENSE("GPL");
  42 +
  43 +struct tm
  44 +{
  45 +       int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
  46 +       int tm_min;                   /* Minutes.     [0-59] */
  47 +       int tm_hour;                  /* Hours.       [0-23] */
  48 +       int tm_mday;                  /* Day.         [1-31] */
  49 +       int tm_mon;                   /* Month.       [0-11] */
  50 +       int tm_year;                  /* Year - 1900.  */
  51 +       int tm_wday;                  /* Day of week. [0-6] */
  52 +       int tm_yday;                  /* Days in year.[0-365] */
  53 +       int tm_isdst;                 /* DST.         [-1/0/1]*/
  54 +
  55 +       long int tm_gmtoff;           /* we don't care, we count from GMT */
  56 +       const char *tm_zone;          /* we don't care, we count from GMT */
  57 +};
  58 +
  59 +void
  60 +localtime(const time_t *timepr, struct tm *r);
  61 +
  62 +static int
  63 +match(const struct sk_buff *skb,
  64 +      const struct net_device *in,
  65 +      const struct net_device *out,
  66 +      const void *matchinfo,
  67 +      int offset,
  68 +      const void *hdr,
  69 +      u_int16_t datalen,
  70 +      int *hotdrop)
  71 +{
  72 +       const struct ipt_time_info *info = matchinfo;   /* match info for rule */
  73 +       struct tm currenttime;                          /* time human readable */
  74 +       u_int8_t days_of_week[7] = {64, 32, 16, 8, 4, 2, 1};
  75 +       u_int16_t packet_time;
  76 +       struct timeval kerneltimeval;
  77 +       time_t packet_local_time;
  78 +
  79 +       /* if kerneltime=1, we don't read the skb->timestamp but kernel time instead */
  80 +       if (info->kerneltime)
  81 +       {
  82 +               do_gettimeofday(&kerneltimeval);
  83 +               packet_local_time = kerneltimeval.tv_sec;
  84 +       }
  85 +       else
  86 +               packet_local_time = skb->stamp.tv_sec;
  87 +
  88 +       /* First we make sure we are in the date start-stop boundaries */
  89 +       if ((packet_local_time < info->date_start) || (packet_local_time > info->date_stop))
  90 +               return 0; /* We are outside the date boundaries */
  91 +
  92 +       /* Transform the timestamp of the packet, in a human readable form */
  93 +       localtime(&packet_local_time, &currenttime);
  94 +
  95 +       /* check if we match this timestamp, we start by the days... */
  96 +       if ((days_of_week[currenttime.tm_wday] & info->days_match) != days_of_week[currenttime.tm_wday])
  97 +               return 0; /* the day doesn't match */
  98 +
  99 +       /* ... check the time now */
 100 +       packet_time = (currenttime.tm_hour * 60) + currenttime.tm_min;
 101 +       if ((packet_time < info->time_start) || (packet_time > info->time_stop))
 102 +               return 0;
 103 +
 104 +       /* here we match ! */
 105 +       return 1;
 106 +}
 107 +
 108 +static int
 109 +checkentry(const char *tablename,
 110 +           const struct ipt_ip *ip,
 111 +           void *matchinfo,
 112 +           unsigned int matchsize,
 113 +           unsigned int hook_mask)
 114 +{
 115 +       struct ipt_time_info *info = matchinfo;   /* match info for rule */
 116 +
 117 +       /* First, check that we are in the correct hooks */
 118 +       if (hook_mask
 119 +            & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT)))
 120 +       {
 121 +               printk("ipt_time: error, only valid for PRE_ROUTING, LOCAL_IN, FORWARD and OUTPUT)\n");
 122 +               return 0;
 123 +       }
 124 +       /* we use the kerneltime if we are in forward or output */
 125 +       info->kerneltime = 1;
 126 +       if (hook_mask & ~((1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT)))
 127 +               /* we use the skb time */
 128 +               info->kerneltime = 0;
 129 +
 130 +       /* Check the size */
 131 +       if (matchsize != IPT_ALIGN(sizeof(struct ipt_time_info)))
 132 +               return 0;
 133 +       /* Now check the coherence of the data ... */
 134 +       if ((info->time_start > 1439) ||        /* 23*60+59 = 1439*/
 135 +           (info->time_stop  > 1439))
 136 +       {
 137 +               printk(KERN_WARNING "ipt_time: invalid argument\n");
 138 +               return 0;
 139 +       }
 140 +
 141 +       return 1;
 142 +}
 143 +
 144 +static struct ipt_match time_match = {
 145 +       .name           = "time",
 146 +       .match          = match,
 147 +       .checkentry     = checkentry,
 148 +       .me             = THIS_MODULE,
 149 +};
 150 +
 151 +static int __init init(void)
 152 +{
 153 +       printk("ipt_time loading\n");
 154 +       return ipt_register_match(&time_match);
 155 +}
 156 +
 157 +static void __exit fini(void)
 158 +{
 159 +       ipt_unregister_match(&time_match);
 160 +       printk("ipt_time unloaded\n");
 161 +}
 162 +
 163 +module_init(init);
 164 +module_exit(fini);
 165 +
 166 +
 167 +/* The part below is borowed and modified from dietlibc */
 168 +
 169 +/* seconds per day */
 170 +#define SPD 24*60*60
 171 +
 172 +void
 173 +localtime(const time_t *timepr, struct tm *r) {
 174 +       time_t i;
 175 +       time_t timep;
 176 +       extern struct timezone sys_tz;
 177 +       const unsigned int __spm[12] =
 178 +               { 0,
 179 +                 (31),
 180 +                 (31+28),
 181 +                 (31+28+31),
 182 +                 (31+28+31+30),
 183 +                 (31+28+31+30+31),
 184 +                 (31+28+31+30+31+30),
 185 +                 (31+28+31+30+31+30+31),
 186 +                 (31+28+31+30+31+30+31+31),
 187 +                 (31+28+31+30+31+30+31+31+30),
 188 +                 (31+28+31+30+31+30+31+31+30+31),
 189 +                 (31+28+31+30+31+30+31+31+30+31+30),
 190 +               };
 191 +       register time_t work;
 192 +
 193 +       timep = (*timepr) - (sys_tz.tz_minuteswest * 60);
 194 +       work=timep%(SPD);
 195 +       r->tm_sec=work%60; work/=60;
 196 +       r->tm_min=work%60; r->tm_hour=work/60;
 197 +       work=timep/(SPD);
 198 +       r->tm_wday=(4+work)%7;
 199 +       for (i=1970; ; ++i) {
 200 +               register time_t k= (!(i%4) && ((i%100) || !(i%400)))?366:365;
 201 +               if (work>k)
 202 +                       work-=k;
 203 +               else
 204 +                       break;
 205 +       }
 206 +       r->tm_year=i-1900;
 207 +       for (i=11; i && __spm[i]>work; --i) ;
 208 +       r->tm_mon=i;
 209 +       r->tm_mday=work-__spm[i]+1;
 210 +}
 211 Index: linux-2.4.35.4/net/ipv4/netfilter/Makefile
 212 ===================================================================
 213 --- linux-2.4.35.4.orig/net/ipv4/netfilter/Makefile     2007-12-15 05:20:10.812456409 +0100
 214 +++ linux-2.4.35.4/net/ipv4/netfilter/Makefile  2007-12-15 05:20:11.216479434 +0100
 215 @@ -111,6 +111,7 @@
 216  obj-$(CONFIG_IP_NF_MATCH_MULTIPORT) += ipt_multiport.o
 217  obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
 218  obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
 219 +obj-$(CONFIG_IP_NF_MATCH_TIME) += ipt_time.o
 220  obj-$(CONFIG_IP_NF_MATCH_CONDITION) += ipt_condition.o
 221
 222  obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 223 Index: linux-2.4.35.4/include/linux/netfilter_ipv4/ipt_time.h
 224 ===================================================================
 225 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 226 +++ linux-2.4.35.4/include/linux/netfilter_ipv4/ipt_time.h      2007-12-15 05:20:11.216479434 +0100
 227 @@ -0,0 +1,15 @@
 228 +#ifndef __ipt_time_h_included__
 229 +#define __ipt_time_h_included__
 230 +
 231 +
 232 +struct ipt_time_info {
 233 +       u_int8_t  days_match;   /* 1 bit per day. -SMTWTFS                      */
 234 +       u_int16_t time_start;   /* 0 < time_start < 23*60+59 = 1439             */
 235 +       u_int16_t time_stop;    /* 0:0 < time_stat < 23:59                      */
 236 +       u_int8_t  kerneltime;   /* ignore skb time (and use kerneltime) or not. */
 237 +       time_t    date_start;
 238 +       time_t    date_stop;
 239 +};
 240 +
 241 +
 242 +#endif /* __ipt_time_h_included__ */