target/linux/generic-2.6/patches-2.6.21/140-netfilter_time.patch

   1 --- /dev/null
   2 +++ b/include/linux/netfilter_ipv4/ipt_time.h
   3 @@ -0,0 +1,18 @@
   4 +#ifndef __ipt_time_h_included__
   5 +#define __ipt_time_h_included__
   6 +
   7 +
   8 +struct ipt_time_info {
   9 +       u_int8_t  days_match;   /* 1 bit per day. -SMTWTFS                      */
  10 +       u_int16_t time_start;   /* 0 < time_start < 23*60+59 = 1439             */
  11 +       u_int16_t time_stop;    /* 0:0 < time_stat < 23:59                      */
  12 +
  13 +                               /* FIXME: Keep this one for userspace iptables binary compability: */
  14 +       u_int8_t  kerneltime;   /* ignore skb time (and use kerneltime) or not. */
  15 +
  16 +       time_t    date_start;
  17 +       time_t    date_stop;
  18 +};
  19 +
  20 +
  21 +#endif /* __ipt_time_h_included__ */
  22 --- /dev/null
  23 +++ b/net/ipv4/netfilter/ipt_time.c
  24 @@ -0,0 +1,178 @@
  25 +/*
  26 +  This is a module which is used for time matching
  27 +  It is using some modified code from dietlibc (localtime() function)
  28 +  that you can find at http://www.fefe.de/dietlibc/
  29 +  This file is distributed under the terms of the GNU General Public
  30 +  License (GPL). Copies of the GPL can be obtained from: ftp://prep.ai.mit.edu/pub/gnu/GPL
  31 +  2001-05-04 Fabrice MARIE <fabrice@netfilter.org> : initial development.
  32 +  2001-21-05 Fabrice MARIE <fabrice@netfilter.org> : bug fix in the match code,
  33 +     thanks to "Zeng Yu" <zengy@capitel.com.cn> for bug report.
  34 +  2001-26-09 Fabrice MARIE <fabrice@netfilter.org> : force the match to be in LOCAL_IN or PRE_ROUTING only.
  35 +  2001-30-11 Fabrice : added the possibility to use the match in FORWARD/OUTPUT with a little hack,
  36 +     added Nguyen Dang Phuoc Dong <dongnd@tlnet.com.vn> patch to support timezones.
  37 +  2004-05-02 Fabrice : added support for date matching, from an idea of Fabien COELHO.
  38 +*/
  39 +
  40 +#include <linux/module.h>
  41 +#include <linux/skbuff.h>
  42 +#include <linux/netfilter_ipv4/ip_tables.h>
  43 +#include <linux/netfilter_ipv4/ipt_time.h>
  44 +#include <linux/time.h>
  45 +
  46 +MODULE_AUTHOR("Fabrice MARIE <fabrice@netfilter.org>");
  47 +MODULE_DESCRIPTION("Match arrival timestamp/date");
  48 +MODULE_LICENSE("GPL");
  49 +
  50 +struct tm
  51 +{
  52 +       int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
  53 +       int tm_min;                   /* Minutes.     [0-59] */
  54 +       int tm_hour;                  /* Hours.       [0-23] */
  55 +       int tm_mday;                  /* Day.         [1-31] */
  56 +       int tm_mon;                   /* Month.       [0-11] */
  57 +       int tm_year;                  /* Year - 1900.  */
  58 +       int tm_wday;                  /* Day of week. [0-6] */
  59 +       int tm_yday;                  /* Days in year.[0-365] */
  60 +       int tm_isdst;                 /* DST.         [-1/0/1]*/
  61 +
  62 +       long int tm_gmtoff;           /* we don't care, we count from GMT */
  63 +       const char *tm_zone;          /* we don't care, we count from GMT */
  64 +};
  65 +
  66 +void
  67 +localtime(const u32 time, struct tm *r);
  68 +
  69 +static int
  70 +match(const struct sk_buff *skb,
  71 +      const struct net_device *in,
  72 +      const struct net_device *out,
  73 +      const struct xt_match *match,
  74 +      const void *matchinfo,
  75 +      int offset,
  76 +      unsigned int protoff,
  77 +      int *hotdrop)
  78 +{
  79 +       const struct ipt_time_info *info = matchinfo;   /* match info for rule */
  80 +       struct tm currenttime;                          /* time human readable */
  81 +       u_int8_t days_of_week[7] = {64, 32, 16, 8, 4, 2, 1};
  82 +       u_int16_t packet_time;
  83 +
  84 +       /* We might not have a timestamp, get one */
  85 +       if (skb->tstamp.off_sec == 0)
  86 +               __net_timestamp((struct sk_buff *)skb);
  87 +
  88 +       /* First we make sure we are in the date start-stop boundaries */
  89 +       if ((skb->tstamp.off_sec < info->date_start) || (skb->tstamp.off_sec > 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(skb->tstamp.off_sec, &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 void *ip,
 111 +          const struct xt_match *match,
 112 +           void *matchinfo,
 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 +
 125 +       /* Now check the coherence of the data ... */
 126 +       if ((info->time_start > 1439) ||        /* 23*60+59 = 1439*/
 127 +           (info->time_stop  > 1439))
 128 +       {
 129 +               printk(KERN_WARNING "ipt_time: invalid argument\n");
 130 +               return 0;
 131 +       }
 132 +
 133 +       return 1;
 134 +}
 135 +
 136 +static struct ipt_match time_match = {
 137 +       .name = "time",
 138 +       .match = &match,
 139 +       .matchsize = sizeof(struct ipt_time_info),
 140 +       .checkentry = &checkentry,
 141 +       .me = THIS_MODULE
 142 +};
 143 +
 144 +static int __init init(void)
 145 +{
 146 +       printk("ipt_time loading\n");
 147 +       return xt_register_match(&time_match);
 148 +}
 149 +
 150 +static void __exit fini(void)
 151 +{
 152 +       xt_unregister_match(&time_match);
 153 +       printk("ipt_time unloaded\n");
 154 +}
 155 +
 156 +module_init(init);
 157 +module_exit(fini);
 158 +
 159 +
 160 +/* The part below is borowed and modified from dietlibc */
 161 +
 162 +/* seconds per day */
 163 +#define SPD 24*60*60
 164 +
 165 +void
 166 +localtime(const u32 time, struct tm *r) {
 167 +       u32 i, timep;
 168 +       extern struct timezone sys_tz;
 169 +       const unsigned int __spm[12] =
 170 +               { 0,
 171 +                 (31),
 172 +                 (31+28),
 173 +                 (31+28+31),
 174 +                 (31+28+31+30),
 175 +                 (31+28+31+30+31),
 176 +                 (31+28+31+30+31+30),
 177 +                 (31+28+31+30+31+30+31),
 178 +                 (31+28+31+30+31+30+31+31),
 179 +                 (31+28+31+30+31+30+31+31+30),
 180 +                 (31+28+31+30+31+30+31+31+30+31),
 181 +                 (31+28+31+30+31+30+31+31+30+31+30),
 182 +               };
 183 +       register u32 work;
 184 +
 185 +       timep = time - (sys_tz.tz_minuteswest * 60);
 186 +       work=timep%(SPD);
 187 +       r->tm_sec=work%60; work/=60;
 188 +       r->tm_min=work%60; r->tm_hour=work/60;
 189 +       work=timep/(SPD);
 190 +       r->tm_wday=(4+work)%7;
 191 +       for (i=1970; ; ++i) {
 192 +               register time_t k= (!(i%4) && ((i%100) || !(i%400)))?366:365;
 193 +               if (work>k)
 194 +                       work-=k;
 195 +               else
 196 +                       break;
 197 +       }
 198 +       r->tm_year=i-1900;
 199 +       for (i=11; i && __spm[i]>work; --i) ;
 200 +       r->tm_mon=i;
 201 +       r->tm_mday=work-__spm[i]+1;
 202 +}
 203 --- a/net/ipv4/netfilter/Kconfig
 204 +++ b/net/ipv4/netfilter/Kconfig
 205 @@ -260,6 +260,22 @@ config IP_NF_MATCH_TOS
 206
 207           To compile it as a module, choose M here.  If unsure, say N.
 208
 209 +
 210 +config IP_NF_MATCH_TIME
 211 +       tristate  'TIME match support'
 212 +       depends on IP_NF_IPTABLES
 213 +       help
 214 +         This option adds a `time' match, which allows you
 215 +         to match based on the packet arrival time/date
 216 +         (arrival time/date at the machine which netfilter is running on) or
 217 +         departure time/date (for locally generated packets).
 218 +
 219 +         If you say Y here, try iptables -m time --help for more information.
 220 +         If you want to compile it as a module, say M here and read
 221 +
 222 +         Documentation/modules.txt.  If unsure, say `N'.
 223 +
 224 +
 225  config IP_NF_MATCH_RECENT
 226         tristate "recent match support"
 227         depends on IP_NF_IPTABLES
 228 --- a/net/ipv4/netfilter/Makefile
 229 +++ b/net/ipv4/netfilter/Makefile
 230 @@ -86,6 +86,7 @@ obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
 231  obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o
 232  obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
 233  obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
 234 +obj-$(CONFIG_IP_NF_MATCH_TIME) += ipt_time.o
 235  obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 236  obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
 237  obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o