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Diffstat (limited to 'extensions/libip6t_random.c')
| -rw-r--r-- | extensions/libip6t_random.c | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/extensions/libip6t_random.c b/extensions/libip6t_random.c deleted file mode 100644 index d34a2308..00000000 --- a/extensions/libip6t_random.c +++ /dev/null @@ -1,150 +0,0 @@ -/* - Shared library add-on to iptables to add match support for random match. - - This file is distributed under the terms of the GNU General Public - License (GPL). Copies of the GPL can be obtained from: - ftp://prep.ai.mit.edu/pub/gnu/GPL - - 2001-10-14 Fabrice MARIE <fabrice@netfilter.org> : initial development. - 2003-04-30 Maciej Soltysiak <solt@dns.toxicfilms.tv> : IPv6 port. -*/ - -#include <stdio.h> -#include <netdb.h> -#include <string.h> -#include <stdlib.h> -#include <syslog.h> -#include <getopt.h> -#include <ip6tables.h> -#include <linux/netfilter_ipv6/ip6_tables.h> -#include <linux/netfilter_ipv6/ip6t_random.h> - -/** - * The kernel random routing returns numbers between 0 and 255. - * To ease the task of the user in choosing the probability - * of matching, we want him to be able to use percentages. - * Therefore we have to accept numbers in percentage here, - * turn them into number between 0 and 255 for the kernel module, - * and turn them back to percentages when we print/save - * the rule. - */ - - -/* Function which prints out usage message. */ -static void -help(void) -{ - printf( -"random v%s options:\n" -" [--average] percent The probability in percentage of the match\n" -" If ommited, a probability of 50%% percent is set.\n" -" Percentage must be within : 1 <= percent <= 99.\n\n", -IPTABLES_VERSION); -} - -static struct option opts[] = { - { "average", 1, 0, '1' }, - { 0 } -}; - -/* Initialize the target. */ -static void -init(struct ip6t_entry_match *m, unsigned int *nfcache) -{ - struct ip6t_rand_info *randinfo = (struct ip6t_rand_info *)(m)->data; - - /* We assign the average to be 50 which is our default value */ - /* 50 * 2.55 = 128 */ - randinfo->average = 128; -} - -#define IP6T_RAND_OPT_AVERAGE 0x01 - -/* Function which parses command options; returns true if it - ate an option */ -static int -parse(int c, char **argv, int invert, unsigned int *flags, - const struct ip6t_entry *entry, - unsigned int *nfcache, - struct ip6t_entry_match **match) -{ - struct ip6t_rand_info *randinfo = (struct ip6t_rand_info *)(*match)->data; - unsigned int num; - - switch (c) { - case '1': - /* check for common mistakes... */ - if (invert) - exit_error(PARAMETER_PROBLEM, - "Can't specify ! --average"); - if (*flags & IP6T_RAND_OPT_AVERAGE) - exit_error(PARAMETER_PROBLEM, - "Can't specify --average twice"); - - /* Remember, this function will interpret a leading 0 to be - Octal, a leading 0x to be hexdecimal... */ - if (string_to_number(optarg, 1, 99, &num) == -1 || num < 1) - exit_error(PARAMETER_PROBLEM, - "bad --average `%s', must be between 1 and 99", optarg); - - /* assign the values */ - randinfo->average = (int)(num * 2.55); - *flags |= IP6T_RAND_OPT_AVERAGE; - break; - default: - return 0; - } - return 1; -} - -/* Final check; nothing. */ -static void final_check(unsigned int flags) -{ -} - -/* Prints out the targinfo. */ -static void -print(const struct ip6t_ip6 *ip, - const struct ip6t_entry_match *match, - int numeric) -{ - const struct ip6t_rand_info *randinfo - = (const struct ip6t_rand_info *)match->data; - div_t result = div((randinfo->average*100), 255); - if (result.rem > 127) /* round up... */ - ++result.quot; - - printf(" random %u%% ", result.quot); -} - -/* Saves the union ip6t_targinfo in parsable form to stdout. */ -static void -save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match) -{ - const struct ip6t_rand_info *randinfo - = (const struct ip6t_rand_info *)match->data; - div_t result = div((randinfo->average *100), 255); - if (result.rem > 127) /* round up... */ - ++result.quot; - - printf("--average %u ", result.quot); -} - -struct ip6tables_match rand_match = { - .name = "random", - .version = IPTABLES_VERSION, - .size = IP6T_ALIGN(sizeof(struct ip6t_rand_info)), - .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_rand_info)), - .help = &help, - .init = &init, - .parse = &parse, - .final_check = &final_check, - .print = &print, - .save = &save, - .extra_opts = opts, -}; - -void _init(void) -{ - register_match6(&rand_match); -} |