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/*
* Shared library add-on to iptables to add CONNSECMARK target support.
*
* Based on the MARK and CONNMARK targets.
*
* Copyright (C) 2006 Red Hat, Inc., James Morris <jmorris@redhat.com>
*/
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter/xt_CONNSECMARK.h>
#define PFX "CONNSECMARK target: "
static void CONNSECMARK_help(void)
{
printf(
"CONNSECMARK target options:\n"
" --save Copy security mark from packet to conntrack\n"
" --restore Copy security mark from connection to packet\n");
}
static const struct option CONNSECMARK_opts[] = {
{.name = "save", .has_arg = false, .val = '1'},
{.name = "restore", .has_arg = false, .val = '2'},
XT_GETOPT_TABLEEND,
};
static int
CONNSECMARK_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_connsecmark_target_info *info =
(struct xt_connsecmark_target_info*)(*target)->data;
switch (c) {
case '1':
if (*flags & CONNSECMARK_SAVE)
xtables_error(PARAMETER_PROBLEM, PFX
"Can't specify --save twice");
info->mode = CONNSECMARK_SAVE;
*flags |= CONNSECMARK_SAVE;
break;
case '2':
if (*flags & CONNSECMARK_RESTORE)
xtables_error(PARAMETER_PROBLEM, PFX
"Can't specify --restore twice");
info->mode = CONNSECMARK_RESTORE;
*flags |= CONNSECMARK_RESTORE;
break;
default:
return 0;
}
return 1;
}
static void CONNSECMARK_check(unsigned int flags)
{
if (!flags)
xtables_error(PARAMETER_PROBLEM, PFX "parameter required");
if (flags == (CONNSECMARK_SAVE|CONNSECMARK_RESTORE))
xtables_error(PARAMETER_PROBLEM, PFX "only one flag of --save "
"or --restore is allowed");
}
static void print_connsecmark(const struct xt_connsecmark_target_info *info)
{
switch (info->mode) {
case CONNSECMARK_SAVE:
printf("save ");
break;
case CONNSECMARK_RESTORE:
printf("restore ");
break;
default:
xtables_error(OTHER_PROBLEM, PFX "invalid mode %hhu\n", info->mode);
}
}
static void
CONNSECMARK_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_connsecmark_target_info *info =
(struct xt_connsecmark_target_info*)(target)->data;
printf("CONNSECMARK ");
print_connsecmark(info);
}
static void
CONNSECMARK_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_connsecmark_target_info *info =
(struct xt_connsecmark_target_info*)target->data;
printf("--");
print_connsecmark(info);
}
static struct xtables_target connsecmark_target = {
.family = NFPROTO_UNSPEC,
.name = "CONNSECMARK",
.version = XTABLES_VERSION,
.revision = 0,
.size = XT_ALIGN(sizeof(struct xt_connsecmark_target_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_connsecmark_target_info)),
.parse = CONNSECMARK_parse,
.help = CONNSECMARK_help,
.final_check = CONNSECMARK_check,
.print = CONNSECMARK_print,
.save = CONNSECMARK_save,
.extra_opts = CONNSECMARK_opts,
};
void _init(void)
{
xtables_register_target(&connsecmark_target);
}
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