+++ /dev/null
-/*
- * IPv6 Hop Limit matching module
- * Maciej Soltysiak <solt@dns.toxicfilms.tv>
- * Based on HW's ttl match
- * This program is released under the terms of GNU GPL
- * Cleanups by Stephane Ouellette <ouellettes@videotron.ca>
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <getopt.h>
-#include <ip6tables.h>
-
-#include <linux/netfilter_ipv6/ip6_tables.h>
-#include <linux/netfilter_ipv6/ip6t_hl.h>
-
-static void hl_help(void)
-{
- printf(
-"hl match options:\n"
-" --hl-eq [!] value Match hop limit value\n"
-" --hl-lt value Match HL < value\n"
-" --hl-gt value Match HL > value\n");
-}
-
-static int hl_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct ip6t_hl_info *info = (struct ip6t_hl_info *) (*match)->data;
- u_int8_t value;
-
- check_inverse(optarg, &invert, &optind, 0);
- value = atoi(argv[optind-1]);
-
- if (*flags)
- exit_error(PARAMETER_PROBLEM,
- "Can't specify HL option twice");
-
- if (!optarg)
- exit_error(PARAMETER_PROBLEM,
- "hl: You must specify a value");
- switch (c) {
- case '2':
- if (invert)
- info->mode = IP6T_HL_NE;
- else
- info->mode = IP6T_HL_EQ;
-
- /* is 0 allowed? */
- info->hop_limit = value;
- *flags = 1;
-
- break;
- case '3':
- if (invert)
- exit_error(PARAMETER_PROBLEM,
- "hl: unexpected `!'");
-
- info->mode = IP6T_HL_LT;
- info->hop_limit = value;
- *flags = 1;
-
- break;
- case '4':
- if (invert)
- exit_error(PARAMETER_PROBLEM,
- "hl: unexpected `!'");
-
- info->mode = IP6T_HL_GT;
- info->hop_limit = value;
- *flags = 1;
-
- break;
- default:
- return 0;
- }
-
- return 1;
-}
-
-static void hl_check(unsigned int flags)
-{
- if (!flags)
- exit_error(PARAMETER_PROBLEM,
- "HL match: You must specify one of "
- "`--hl-eq', `--hl-lt', `--hl-gt'");
-}
-
-static void hl_print(const void *ip, const struct xt_entry_match *match,
- int numeric)
-{
- static const char *op[] = {
- [IP6T_HL_EQ] = "==",
- [IP6T_HL_NE] = "!=",
- [IP6T_HL_LT] = "<",
- [IP6T_HL_GT] = ">" };
-
- const struct ip6t_hl_info *info =
- (struct ip6t_hl_info *) match->data;
-
- printf("HL match HL %s %u ", op[info->mode], info->hop_limit);
-}
-
-static void hl_save(const void *ip, const struct xt_entry_match *match)
-{
- static const char *op[] = {
- [IP6T_HL_EQ] = "eq",
- [IP6T_HL_NE] = "eq !",
- [IP6T_HL_LT] = "lt",
- [IP6T_HL_GT] = "gt" };
-
- const struct ip6t_hl_info *info =
- (struct ip6t_hl_info *) match->data;
-
- printf("--hl-%s %u ", op[info->mode], info->hop_limit);
-}
-
-static const struct option hl_opts[] = {
- { .name = "hl", .has_arg = 1, .val = '2' },
- { .name = "hl-eq", .has_arg = 1, .val = '2' },
- { .name = "hl-lt", .has_arg = 1, .val = '3' },
- { .name = "hl-gt", .has_arg = 1, .val = '4' },
- { .name = NULL }
-};
-
-static struct xtables_match hl_mt6_reg = {
- .name = "hl",
- .version = XTABLES_VERSION,
- .family = PF_INET6,
- .size = XT_ALIGN(sizeof(struct ip6t_hl_info)),
- .userspacesize = XT_ALIGN(sizeof(struct ip6t_hl_info)),
- .help = hl_help,
- .parse = hl_parse,
- .final_check = hl_check,
- .print = hl_print,
- .save = hl_save,
- .extra_opts = hl_opts,
-};
-
-
-void _init(void)
-{
- xtables_register_match(&hl_mt6_reg);
-}