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

   1 Index: linux-2.6.21.7/include/linux/netfilter_ipv4/ipt_time.h
   2 ===================================================================
   3 --- /dev/null
   4 +++ linux-2.6.21.7/include/linux/netfilter_ipv4/ipt_time.h
   5 @@ -0,0 +1,18 @@
   6 +#ifndef __ipt_time_h_included__
   7 +#define __ipt_time_h_included__
   8 +
   9 +
  10 +struct ipt_time_info {
  11 +       u_int8_t  days_match;   /* 1 bit per day. -SMTWTFS                      */
  12 +       u_int16_t time_start;   /* 0 < time_start < 23*60+59 = 1439             */
  13 +       u_int16_t time_stop;    /* 0:0 < time_stat < 23:59                      */
  14 +
  15 +                               /* FIXME: Keep this one for userspace iptables binary compability: */
  16 +       u_int8_t  kerneltime;   /* ignore skb time (and use kerneltime) or not. */
  17 +
  18 +       time_t    date_start;
  19 +       time_t    date_stop;
  20 +};
  21 +
  22 +
  23 +#endif /* __ipt_time_h_included__ */
  24 Index: linux-2.6.21.7/net/ipv4/netfilter/ipt_time.c
  25 ===================================================================
  26 --- /dev/null
  27 +++ linux-2.6.21.7/net/ipv4/netfilter/ipt_time.c
  28 @@ -0,0 +1,178 @@
  29 +/*
  30 +  This is a module which is used for time matching
  31 +  It is using some modified code from dietlibc (localtime() function)
  32 +  that you can find at http://www.fefe.de/dietlibc/
  33 +  This file is distributed under the terms of the GNU General Public
  34 +  License (GPL). Copies of the GPL can be obtained from: ftp://prep.ai.mit.edu/pub/gnu/GPL
  35 +  2001-05-04 Fabrice MARIE <fabrice@netfilter.org> : initial development.
  36 +  2001-21-05 Fabrice MARIE <fabrice@netfilter.org> : bug fix in the match code,
  37 +     thanks to "Zeng Yu" <zengy@capitel.com.cn> for bug report.
  38 +  2001-26-09 Fabrice MARIE <fabrice@netfilter.org> : force the match to be in LOCAL_IN or PRE_ROUTING only.
  39 +  2001-30-11 Fabrice : added the possibility to use the match in FORWARD/OUTPUT with a little hack,
  40 +     added Nguyen Dang Phuoc Dong <dongnd@tlnet.com.vn> patch to support timezones.
  41 +  2004-05-02 Fabrice : added support for date matching, from an idea of Fabien COELHO.
  42 +*/
  43 +
  44 +#include <linux/module.h>
  45 +#include <linux/skbuff.h>
  46 +#include <linux/netfilter_ipv4/ip_tables.h>
  47 +#include <linux/netfilter_ipv4/ipt_time.h>
  48 +#include <linux/time.h>
  49 +
  50 +MODULE_AUTHOR("Fabrice MARIE <fabrice@netfilter.org>");
  51 +MODULE_DESCRIPTION("Match arrival timestamp/date");
  52 +MODULE_LICENSE("GPL");
  53 +
  54 +struct tm
  55 +{
  56 +       int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
  57 +       int tm_min;                   /* Minutes.     [0-59] */
  58 +       int tm_hour;                  /* Hours.       [0-23] */
  59 +       int tm_mday;                  /* Day.         [1-31] */
  60 +       int tm_mon;                   /* Month.       [0-11] */
  61 +       int tm_year;                  /* Year - 1900.  */
  62 +       int tm_wday;                  /* Day of week. [0-6] */
  63 +       int tm_yday;                  /* Days in year.[0-365] */
  64 +       int tm_isdst;                 /* DST.         [-1/0/1]*/
  65 +
  66 +       long int tm_gmtoff;           /* we don't care, we count from GMT */
  67 +       const char *tm_zone;          /* we don't care, we count from GMT */
  68 +};
  69 +
  70 +void
  71 +localtime(const u32 time, struct tm *r);
  72 +
  73 +static int
  74 +match(const struct sk_buff *skb,
  75 +      const struct net_device *in,
  76 +      const struct net_device *out,
  77 +      const struct xt_match *match,
  78 +      const void *matchinfo,
  79 +      int offset,
  80 +      unsigned int protoff,
  81 +      int *hotdrop)
  82 +{
  83 +       const struct ipt_time_info *info = matchinfo;   /* match info for rule */
  84 +       struct tm currenttime;                          /* time human readable */
  85 +       u_int8_t days_of_week[7] = {64, 32, 16, 8, 4, 2, 1};
  86 +       u_int16_t packet_time;
  87 +
  88 +       /* We might not have a timestamp, get one */
  89 +       if (skb->tstamp.off_sec == 0)
  90 +               __net_timestamp((struct sk_buff *)skb);
  91 +
  92 +       /* First we make sure we are in the date start-stop boundaries */
  93 +       if ((skb->tstamp.off_sec < info->date_start) || (skb->tstamp.off_sec > info->date_stop))
  94 +               return 0; /* We are outside the date boundaries */
  95 +
  96 +       /* Transform the timestamp of the packet, in a human readable form */
  97 +       localtime(skb->tstamp.off_sec, &currenttime);
  98 +
  99 +       /* check if we match this timestamp, we start by the days... */
 100 +       if ((days_of_week[currenttime.tm_wday] & info->days_match) != days_of_week[currenttime.tm_wday])
 101 +               return 0; /* the day doesn't match */
 102 +
 103 +       /* ... check the time now */
 104 +       packet_time = (currenttime.tm_hour * 60) + currenttime.tm_min;
 105 +       if ((packet_time < info->time_start) || (packet_time > info->time_stop))
 106 +               return 0;
 107 +
 108 +       /* here we match ! */
 109 +       return 1;
 110 +}
 111 +
 112 +static int
 113 +checkentry(const char *tablename,
 114 +           const void *ip,
 115 +          const struct xt_match *match,
 116 +           void *matchinfo,
 117 +           unsigned int hook_mask)
 118 +{
 119 +       struct ipt_time_info *info = matchinfo;   /* match info for rule */
 120 +
 121 +       /* First, check that we are in the correct hooks */
 122 +       if (hook_mask
 123 +            & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT)))
 124 +       {
 125 +               printk("ipt_time: error, only valid for PRE_ROUTING, LOCAL_IN, FORWARD and OUTPUT)\n");
 126 +               return 0;
 127 +       }
 128 +
 129 +       /* Now check the coherence of the data ... */
 130 +       if ((info->time_start > 1439) ||        /* 23*60+59 = 1439*/
 131 +           (info->time_stop  > 1439))
 132 +       {
 133 +               printk(KERN_WARNING "ipt_time: invalid argument\n");
 134 +               return 0;
 135 +       }
 136 +
 137 +       return 1;
 138 +}
 139 +
 140 +static struct ipt_match time_match = {
 141 +       .name = "time",
 142 +       .match = &match,
 143 +       .matchsize = sizeof(struct ipt_time_info),
 144 +       .checkentry = &checkentry,
 145 +       .me = THIS_MODULE
 146 +};
 147 +
 148 +static int __init init(void)
 149 +{
 150 +       printk("ipt_time loading\n");
 151 +       return xt_register_match(&time_match);
 152 +}
 153 +
 154 +static void __exit fini(void)
 155 +{
 156 +       xt_unregister_match(&time_match);
 157 +       printk("ipt_time unloaded\n");
 158 +}
 159 +
 160 +module_init(init);
 161 +module_exit(fini);
 162 +
 163 +
 164 +/* The part below is borowed and modified from dietlibc */
 165 +
 166 +/* seconds per day */
 167 +#define SPD 24*60*60
 168 +
 169 +void
 170 +localtime(const u32 time, struct tm *r) {
 171 +       u32 i, timep;
 172 +       extern struct timezone sys_tz;
 173 +       const unsigned int __spm[12] =
 174 +               { 0,
 175 +                 (31),
 176 +                 (31+28),
 177 +                 (31+28+31),
 178 +                 (31+28+31+30),
 179 +                 (31+28+31+30+31),
 180 +                 (31+28+31+30+31+30),
 181 +                 (31+28+31+30+31+30+31),
 182 +                 (31+28+31+30+31+30+31+31),
 183 +                 (31+28+31+30+31+30+31+31+30),
 184 +                 (31+28+31+30+31+30+31+31+30+31),
 185 +                 (31+28+31+30+31+30+31+31+30+31+30),
 186 +               };
 187 +       register u32 work;
 188 +
 189 +       timep = time - (sys_tz.tz_minuteswest * 60);
 190 +       work=timep%(SPD);
 191 +       r->tm_sec=work%60; work/=60;
 192 +       r->tm_min=work%60; r->tm_hour=work/60;
 193 +       work=timep/(SPD);
 194 +       r->tm_wday=(4+work)%7;
 195 +       for (i=1970; ; ++i) {
 196 +               register time_t k= (!(i%4) && ((i%100) || !(i%400)))?366:365;
 197 +               if (work>k)
 198 +                       work-=k;
 199 +               else
 200 +                       break;
 201 +       }
 202 +       r->tm_year=i-1900;
 203 +       for (i=11; i && __spm[i]>work; --i) ;
 204 +       r->tm_mon=i;
 205 +       r->tm_mday=work-__spm[i]+1;
 206 +}
 207 Index: linux-2.6.21.7/net/ipv4/netfilter/Kconfig
 208 ===================================================================
 209 --- linux-2.6.21.7.orig/net/ipv4/netfilter/Kconfig
 210 +++ linux-2.6.21.7/net/ipv4/netfilter/Kconfig
 211 @@ -260,6 +260,22 @@ config IP_NF_MATCH_TOS
 212
 213           To compile it as a module, choose M here.  If unsure, say N.
 214
 215 +
 216 +config IP_NF_MATCH_TIME
 217 +       tristate  'TIME match support'
 218 +       depends on IP_NF_IPTABLES
 219 +       help
 220 +         This option adds a `time' match, which allows you
 221 +         to match based on the packet arrival time/date
 222 +         (arrival time/date at the machine which netfilter is running on) or
 223 +         departure time/date (for locally generated packets).
 224 +
 225 +         If you say Y here, try iptables -m time --help for more information.
 226 +         If you want to compile it as a module, say M here and read
 227 +
 228 +         Documentation/modules.txt.  If unsure, say `N'.
 229 +
 230 +
 231  config IP_NF_MATCH_RECENT
 232         tristate "recent match support"
 233         depends on IP_NF_IPTABLES
 234 Index: linux-2.6.21.7/net/ipv4/netfilter/Makefile
 235 ===================================================================
 236 --- linux-2.6.21.7.orig/net/ipv4/netfilter/Makefile
 237 +++ linux-2.6.21.7/net/ipv4/netfilter/Makefile
 238 @@ -86,6 +86,7 @@ obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
 239  obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o
 240  obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
 241  obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
 242 +obj-$(CONFIG_IP_NF_MATCH_TIME) += ipt_time.o
 243  obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 244  obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
 245  obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o