/*
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* IPv6 Hop Limit Target module
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* Maciej Soltysiak <solt@dns.toxicfilms.tv>
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* Based on HW's ttl target
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* This program is distributed under the terms of GNU GPL
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*/
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#include <stdio.h>
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#include <xtables.h>
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#include <linux/netfilter_ipv6/ip6t_HL.h>
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enum {
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O_HL_SET = 0,
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O_HL_INC,
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O_HL_DEC,
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F_HL_SET = 1 << O_HL_SET,
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F_HL_INC = 1 << O_HL_INC,
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F_HL_DEC = 1 << O_HL_DEC,
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F_ANY = F_HL_SET | F_HL_INC | F_HL_DEC,
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};
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#define s struct ip6t_HL_info
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static const struct xt_option_entry HL_opts[] = {
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{.name = "hl-set", .type = XTTYPE_UINT8, .id = O_HL_SET,
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.excl = F_ANY, .flags = XTOPT_PUT, XTOPT_POINTER(s, hop_limit)},
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{.name = "hl-dec", .type = XTTYPE_UINT8, .id = O_HL_DEC,
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.excl = F_ANY, .flags = XTOPT_PUT, XTOPT_POINTER(s, hop_limit),
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.min = 1},
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{.name = "hl-inc", .type = XTTYPE_UINT8, .id = O_HL_INC,
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.excl = F_ANY, .flags = XTOPT_PUT, XTOPT_POINTER(s, hop_limit),
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.min = 1},
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XTOPT_TABLEEND,
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};
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#undef s
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static void HL_help(void)
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{
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printf(
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"HL target options\n"
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" --hl-set value Set HL to <value 0-255>\n"
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" --hl-dec value Decrement HL by <value 1-255>\n"
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" --hl-inc value Increment HL by <value 1-255>\n");
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}
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static void HL_parse(struct xt_option_call *cb)
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{
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struct ip6t_HL_info *info = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_HL_SET:
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info->mode = IP6T_HL_SET;
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break;
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case O_HL_INC:
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info->mode = IP6T_HL_INC;
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break;
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case O_HL_DEC:
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info->mode = IP6T_HL_DEC;
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break;
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}
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}
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static void HL_check(struct xt_fcheck_call *cb)
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{
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if (!(cb->xflags & F_ANY))
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xtables_error(PARAMETER_PROBLEM,
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"HL: You must specify an action");
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}
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static void HL_save(const void *ip, const struct xt_entry_target *target)
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{
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const struct ip6t_HL_info *info =
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(struct ip6t_HL_info *) target->data;
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switch (info->mode) {
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case IP6T_HL_SET:
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printf(" --hl-set");
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break;
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case IP6T_HL_DEC:
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printf(" --hl-dec");
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break;
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case IP6T_HL_INC:
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printf(" --hl-inc");
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break;
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}
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printf(" %u", info->hop_limit);
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}
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static void HL_print(const void *ip, const struct xt_entry_target *target,
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int numeric)
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{
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const struct ip6t_HL_info *info =
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(struct ip6t_HL_info *) target->data;
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printf(" HL ");
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switch (info->mode) {
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case IP6T_HL_SET:
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printf("set to");
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break;
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case IP6T_HL_DEC:
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printf("decrement by");
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break;
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case IP6T_HL_INC:
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printf("increment by");
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break;
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}
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printf(" %u", info->hop_limit);
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}
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static struct xtables_target hl_tg6_reg = {
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.name = "HL",
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.version = XTABLES_VERSION,
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.family = NFPROTO_IPV6,
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.size = XT_ALIGN(sizeof(struct ip6t_HL_info)),
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.userspacesize = XT_ALIGN(sizeof(struct ip6t_HL_info)),
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.help = HL_help,
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.print = HL_print,
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.save = HL_save,
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.x6_parse = HL_parse,
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.x6_fcheck = HL_check,
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.x6_options = HL_opts,
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};
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void _init(void)
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{
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xtables_register_target(&hl_tg6_reg);
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}
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