target/linux/generic-2.4/patches/621-netfilter_random.patch

   1 Index: linux-2.4.35.4/Documentation/Configure.help
   2 ===================================================================
   3 --- linux-2.4.35.4.orig/Documentation/Configure.help
   4 +++ linux-2.4.35.4/Documentation/Configure.help
   5 @@ -2914,6 +2914,15 @@ CONFIG_IP_NF_MATCH_MAC
   6    If you want to compile it as a module, say M here and read
   7    <file:Documentation/modules.txt>.  If unsure, say `N'.
   8
   9 +Random match support
  10 +CONFIG_IP_NF_MATCH_RANDOM
  11 +  This option adds a `random' match,
  12 +  which allow you to match packets randomly
  13 +  following a given probability.
  14 +
  15 +  If you want to compile it as a module, say M here and read
  16 +  Documentation/modules.txt.  If unsure, say `N'.
  17 +
  18  Netfilter MARK match support
  19  CONFIG_IP_NF_MATCH_MARK
  20    Netfilter mark matching allows you to match packets based on the
  21 @@ -3229,6 +3238,7 @@ CONFIG_IP_NF_MATCH_HELPER
  22    If you want to compile it as a module, say M here and read
  23    Documentation/modules.txt.  If unsure, say `Y'.
  24
  25 +
  26  TCPMSS match support
  27  CONFIG_IP_NF_MATCH_TCPMSS
  28    This option adds a `tcpmss' match, which allows you to examine the
  29 @@ -3376,6 +3386,14 @@ CONFIG_IP6_NF_MATCH_MAC
  30    If you want to compile it as a module, say M here and read
  31    <file:Documentation/modules.txt>.  If unsure, say `N'.
  32
  33 +CONFIG_IP6_NF_MATCH_RANDOM
  34 +  This option adds a `random' match,
  35 +  which allow you to match packets randomly
  36 +  following a given probability.
  37 +
  38 +  If you want to compile it as a module, say M here and read
  39 +  Documentation/modules.txt.  If unsure, say `N'.
  40 +
  41  length match support
  42  CONFIG_IP6_NF_MATCH_LENGTH
  43    This option allows you to match the length of a packet against a
  44 Index: linux-2.4.35.4/include/linux/netfilter_ipv4/ipt_random.h
  45 ===================================================================
  46 --- /dev/null
  47 +++ linux-2.4.35.4/include/linux/netfilter_ipv4/ipt_random.h
  48 @@ -0,0 +1,11 @@
  49 +#ifndef _IPT_RAND_H
  50 +#define _IPT_RAND_H
  51 +
  52 +#include <linux/param.h>
  53 +#include <linux/types.h>
  54 +
  55 +struct ipt_rand_info {
  56 +       u_int8_t average;
  57 +};
  58 +
  59 +#endif /*_IPT_RAND_H*/
  60 Index: linux-2.4.35.4/include/linux/netfilter_ipv6/ip6t_random.h
  61 ===================================================================
  62 --- /dev/null
  63 +++ linux-2.4.35.4/include/linux/netfilter_ipv6/ip6t_random.h
  64 @@ -0,0 +1,11 @@
  65 +#ifndef _IP6T_RAND_H
  66 +#define _IP6T_RAND_H
  67 +
  68 +#include <linux/param.h>
  69 +#include <linux/types.h>
  70 +
  71 +struct ip6t_rand_info {
  72 +       u_int8_t average;
  73 +};
  74 +
  75 +#endif /*_IP6T_RAND_H*/
  76 Index: linux-2.4.35.4/net/ipv4/netfilter/Config.in
  77 ===================================================================
  78 --- linux-2.4.35.4.orig/net/ipv4/netfilter/Config.in
  79 +++ linux-2.4.35.4/net/ipv4/netfilter/Config.in
  80 @@ -48,6 +48,7 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ];
  81    dep_tristate '  netfilter MARK match support' CONFIG_IP_NF_MATCH_MARK $CONFIG_IP_NF_IPTABLES
  82    dep_tristate '  Multiple port match support' CONFIG_IP_NF_MATCH_MULTIPORT $CONFIG_IP_NF_IPTABLES
  83    dep_tristate '  TOS match support' CONFIG_IP_NF_MATCH_TOS $CONFIG_IP_NF_IPTABLES
  84 +  dep_tristate '  random match support' CONFIG_IP_NF_MATCH_RANDOM $CONFIG_IP_NF_IPTABLES
  85    dep_tristate '  condition match support' CONFIG_IP_NF_MATCH_CONDITION $CONFIG_IP_NF_IPTABLES
  86    dep_tristate '  recent match support' CONFIG_IP_NF_MATCH_RECENT $CONFIG_IP_NF_IPTABLES
  87    dep_tristate '  ECN match support' CONFIG_IP_NF_MATCH_ECN $CONFIG_IP_NF_IPTABLES
  88 Index: linux-2.4.35.4/net/ipv4/netfilter/ipt_random.c
  89 ===================================================================
  90 --- /dev/null
  91 +++ linux-2.4.35.4/net/ipv4/netfilter/ipt_random.c
  92 @@ -0,0 +1,96 @@
  93 +/*
  94 +  This is a module which is used for a "random" match support.
  95 +  This file is distributed under the terms of the GNU General Public
  96 +  License (GPL). Copies of the GPL can be obtained from:
  97 +     ftp://prep.ai.mit.edu/pub/gnu/GPL
  98 +
  99 +  2001-10-14 Fabrice MARIE <fabrice@netfilter.org> : initial implementation.
 100 +*/
 101 +
 102 +#include <linux/module.h>
 103 +#include <linux/skbuff.h>
 104 +#include <linux/ip.h>
 105 +#include <linux/random.h>
 106 +#include <net/tcp.h>
 107 +#include <linux/spinlock.h>
 108 +#include <linux/netfilter_ipv4/ip_tables.h>
 109 +#include <linux/netfilter_ipv4/ipt_random.h>
 110 +
 111 +MODULE_LICENSE("GPL");
 112 +
 113 +static int
 114 +ipt_rand_match(const struct sk_buff *pskb,
 115 +              const struct net_device *in,
 116 +              const struct net_device *out,
 117 +              const void *matchinfo,
 118 +              int offset,
 119 +              const void *hdr,
 120 +              u_int16_t datalen,
 121 +              int *hotdrop)
 122 +{
 123 +       /* Parameters from userspace */
 124 +       const struct ipt_rand_info *info = matchinfo;
 125 +       u_int8_t random_number;
 126 +
 127 +       /* get 1 random number from the kernel random number generation routine */
 128 +       get_random_bytes((void *)(&random_number), 1);
 129 +
 130 +       /* Do we match ? */
 131 +       if (random_number <= info->average)
 132 +               return 1;
 133 +       else
 134 +               return 0;
 135 +}
 136 +
 137 +static int
 138 +ipt_rand_checkentry(const char *tablename,
 139 +                  const struct ipt_ip *e,
 140 +                  void *matchinfo,
 141 +                  unsigned int matchsize,
 142 +                  unsigned int hook_mask)
 143 +{
 144 +       /* Parameters from userspace */
 145 +       const struct ipt_rand_info *info = matchinfo;
 146 +
 147 +       if (matchsize != IPT_ALIGN(sizeof(struct ipt_rand_info))) {
 148 +               printk("ipt_random: matchsize %u != %u\n", matchsize,
 149 +                      IPT_ALIGN(sizeof(struct ipt_rand_info)));
 150 +               return 0;
 151 +       }
 152 +
 153 +       /* must be  1 <= average % <= 99 */
 154 +       /* 1  x 2.55 = 2   */
 155 +       /* 99 x 2.55 = 252 */
 156 +       if ((info->average < 2) || (info->average > 252)) {
 157 +               printk("ipt_random:  invalid average %u\n", info->average);
 158 +               return 0;
 159 +       }
 160 +
 161 +       return 1;
 162 +}
 163 +
 164 +static struct ipt_match ipt_rand_reg = {
 165 +       {NULL, NULL},
 166 +       "random",
 167 +       ipt_rand_match,
 168 +       ipt_rand_checkentry,
 169 +       NULL,
 170 +       THIS_MODULE };
 171 +
 172 +static int __init init(void)
 173 +{
 174 +       if (ipt_register_match(&ipt_rand_reg))
 175 +               return -EINVAL;
 176 +
 177 +       printk("ipt_random match loaded\n");
 178 +       return 0;
 179 +}
 180 +
 181 +static void __exit fini(void)
 182 +{
 183 +       ipt_unregister_match(&ipt_rand_reg);
 184 +       printk("ipt_random match unloaded\n");
 185 +}
 186 +
 187 +module_init(init);
 188 +module_exit(fini);
 189 Index: linux-2.4.35.4/net/ipv4/netfilter/Makefile
 190 ===================================================================
 191 --- linux-2.4.35.4.orig/net/ipv4/netfilter/Makefile
 192 +++ linux-2.4.35.4/net/ipv4/netfilter/Makefile
 193 @@ -115,6 +115,8 @@ obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos
 194  obj-$(CONFIG_IP_NF_MATCH_TIME) += ipt_time.o
 195  obj-$(CONFIG_IP_NF_MATCH_CONDITION) += ipt_condition.o
 196
 197 +obj-$(CONFIG_IP_NF_MATCH_RANDOM) += ipt_random.o
 198 +
 199  obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 200
 201  obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
 202 Index: linux-2.4.35.4/net/ipv6/netfilter/Config.in
 203 ===================================================================
 204 --- linux-2.4.35.4.orig/net/ipv6/netfilter/Config.in
 205 +++ linux-2.4.35.4/net/ipv6/netfilter/Config.in
 206 @@ -19,6 +19,7 @@ if [ "$CONFIG_IP6_NF_IPTABLES" != "n" ];
 207    dep_tristate '  limit match support' CONFIG_IP6_NF_MATCH_LIMIT $CONFIG_IP6_NF_IPTABLES
 208    dep_tristate '  condition match support' CONFIG_IP6_NF_MATCH_CONDITION $CONFIG_IP6_NF_IPTABLES
 209    dep_tristate '  MAC address match support' CONFIG_IP6_NF_MATCH_MAC $CONFIG_IP6_NF_IPTABLES
 210 +  dep_tristate '  Random match support' CONFIG_IP6_NF_MATCH_RANDOM $CONFIG_IP6_NF_IPTABLES
 211    if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
 212      dep_tristate '  Routing header match support (EXPERIMENTAL)' CONFIG_IP6_NF_MATCH_RT $CONFIG_IP6_NF_IPTABLES
 213    fi
 214 Index: linux-2.4.35.4/net/ipv6/netfilter/ip6t_random.c
 215 ===================================================================
 216 --- /dev/null
 217 +++ linux-2.4.35.4/net/ipv6/netfilter/ip6t_random.c
 218 @@ -0,0 +1,97 @@
 219 +/*
 220 +  This is a module which is used for a "random" match support.
 221 +  This file is distributed under the terms of the GNU General Public
 222 +  License (GPL). Copies of the GPL can be obtained from:
 223 +     ftp://prep.ai.mit.edu/pub/gnu/GPL
 224 +
 225 +  2001-10-14 Fabrice MARIE <fabrice@netfilter.org> : initial implementation.
 226 +  2003-04-30 Maciej Soltysiak <solt@dns.toxicfilms.tv> : IPv6 Port
 227 +*/
 228 +
 229 +#include <linux/module.h>
 230 +#include <linux/skbuff.h>
 231 +#include <linux/ip.h>
 232 +#include <linux/random.h>
 233 +#include <net/tcp.h>
 234 +#include <linux/spinlock.h>
 235 +#include <linux/netfilter_ipv6/ip6_tables.h>
 236 +#include <linux/netfilter_ipv6/ip6t_random.h>
 237 +
 238 +MODULE_LICENSE("GPL");
 239 +
 240 +static int
 241 +ip6t_rand_match(const struct sk_buff *pskb,
 242 +              const struct net_device *in,
 243 +              const struct net_device *out,
 244 +              const void *matchinfo,
 245 +              int offset,
 246 +              const void *hdr,
 247 +              u_int16_t datalen,
 248 +              int *hotdrop)
 249 +{
 250 +       /* Parameters from userspace */
 251 +       const struct ip6t_rand_info *info = matchinfo;
 252 +       u_int8_t random_number;
 253 +
 254 +       /* get 1 random number from the kernel random number generation routine */
 255 +       get_random_bytes((void *)(&random_number), 1);
 256 +
 257 +       /* Do we match ? */
 258 +       if (random_number <= info->average)
 259 +               return 1;
 260 +       else
 261 +               return 0;
 262 +}
 263 +
 264 +static int
 265 +ip6t_rand_checkentry(const char *tablename,
 266 +                  const struct ip6t_ip6 *e,
 267 +                  void *matchinfo,
 268 +                  unsigned int matchsize,
 269 +                  unsigned int hook_mask)
 270 +{
 271 +       /* Parameters from userspace */
 272 +       const struct ip6t_rand_info *info = matchinfo;
 273 +
 274 +       if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_rand_info))) {
 275 +               printk("ip6t_random: matchsize %u != %u\n", matchsize,
 276 +                      IP6T_ALIGN(sizeof(struct ip6t_rand_info)));
 277 +               return 0;
 278 +       }
 279 +
 280 +       /* must be  1 <= average % <= 99 */
 281 +       /* 1  x 2.55 = 2   */
 282 +       /* 99 x 2.55 = 252 */
 283 +       if ((info->average < 2) || (info->average > 252)) {
 284 +               printk("ip6t_random:  invalid average %u\n", info->average);
 285 +               return 0;
 286 +       }
 287 +
 288 +       return 1;
 289 +}
 290 +
 291 +static struct ip6t_match ip6t_rand_reg = {
 292 +       {NULL, NULL},
 293 +       "random",
 294 +       ip6t_rand_match,
 295 +       ip6t_rand_checkentry,
 296 +       NULL,
 297 +       THIS_MODULE };
 298 +
 299 +static int __init init(void)
 300 +{
 301 +       if (ip6t_register_match(&ip6t_rand_reg))
 302 +               return -EINVAL;
 303 +
 304 +       printk("ip6t_random match loaded\n");
 305 +       return 0;
 306 +}
 307 +
 308 +static void __exit fini(void)
 309 +{
 310 +       ip6t_unregister_match(&ip6t_rand_reg);
 311 +       printk("ip6t_random match unloaded\n");
 312 +}
 313 +
 314 +module_init(init);
 315 +module_exit(fini);
 316 Index: linux-2.4.35.4/net/ipv6/netfilter/Makefile
 317 ===================================================================
 318 --- linux-2.4.35.4.orig/net/ipv6/netfilter/Makefile
 319 +++ linux-2.4.35.4/net/ipv6/netfilter/Makefile
 320 @@ -32,6 +32,7 @@ obj-$(CONFIG_IP6_NF_TARGET_MARK) += ip6t
 321  obj-$(CONFIG_IP6_NF_TARGET_IMQ) += ip6t_IMQ.o
 322  obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.o
 323  obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
 324 +obj-$(CONFIG_IP6_NF_MATCH_RANDOM) += ip6t_random.o
 325  obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
 326
 327  include $(TOPDIR)/Rules.make