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/* Shared library add-on to iptables to add connmark matching support.
*
* (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
* by Henrik Nordstrom <hno@marasystems.com>
*
* Version 1.1
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter/xt_connmark.h>
struct xt_connmark_info {
unsigned long mark, mask;
uint8_t invert;
};
enum {
O_MARK = 0,
};
static void connmark_mt_help(void)
{
printf(
"connmark match options:\n"
"[!] --mark value[/mask] Match ctmark value with optional mask\n");
}
static const struct xt_option_entry connmark_mt_opts[] = {
{.name = "mark", .id = O_MARK, .type = XTTYPE_MARKMASK32,
.flags = XTOPT_MAND | XTOPT_INVERT},
XTOPT_TABLEEND,
};
static void connmark_mt_parse(struct xt_option_call *cb)
{
struct xt_connmark_mtinfo1 *info = cb->data;
xtables_option_parse(cb);
if (cb->invert)
info->invert = true;
info->mark = cb->val.mark;
info->mask = cb->val.mask;
}
static void connmark_parse(struct xt_option_call *cb)
{
struct xt_connmark_info *markinfo = cb->data;
xtables_option_parse(cb);
markinfo->mark = cb->val.mark;
markinfo->mask = cb->val.mask;
if (cb->invert)
markinfo->invert = 1;
}
static void print_mark(unsigned int mark, unsigned int mask)
{
if (mask != 0xffffffffU)
printf(" 0x%x/0x%x", mark, mask);
else
printf(" 0x%x", mark);
}
static void
connmark_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_connmark_info *info = (const void *)match->data;
printf(" CONNMARK match ");
if (info->invert)
printf("!");
print_mark(info->mark, info->mask);
}
static void
connmark_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_connmark_mtinfo1 *info = (const void *)match->data;
printf(" connmark match ");
if (info->invert)
printf("!");
print_mark(info->mark, info->mask);
}
static void connmark_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_connmark_info *info = (const void *)match->data;
if (info->invert)
printf(" !");
printf(" --mark");
print_mark(info->mark, info->mask);
}
static void
connmark_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_connmark_mtinfo1 *info = (const void *)match->data;
if (info->invert)
printf(" !");
printf(" --mark");
print_mark(info->mark, info->mask);
}
static void print_mark_xlate(unsigned int mark, unsigned int mask,
struct xt_xlate *xl, uint32_t op)
{
if (mask != 0xffffffffU)
xt_xlate_add(xl, " and 0x%x %s 0x%x", mask,
op == XT_OP_EQ ? "==" : "!=", mark);
else
xt_xlate_add(xl, " %s0x%x",
op == XT_OP_EQ ? "" : "!= ", mark);
}
static int connmark_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_connmark_info *info = (const void *)params->match->data;
enum xt_op op = XT_OP_EQ;
if (info->invert)
op = XT_OP_NEQ;
xt_xlate_add(xl, "ct mark");
print_mark_xlate(info->mark, info->mask, xl, op);
return 1;
}
static int
connmark_mt_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_connmark_mtinfo1 *info =
(const void *)params->match->data;
enum xt_op op = XT_OP_EQ;
if (info->invert)
op = XT_OP_NEQ;
xt_xlate_add(xl, "ct mark");
print_mark_xlate(info->mark, info->mask, xl, op);
return 1;
}
static struct xtables_match connmark_mt_reg[] = {
{
.family = NFPROTO_UNSPEC,
.name = "connmark",
.revision = 0,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_connmark_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_info)),
.help = connmark_mt_help,
.print = connmark_print,
.save = connmark_save,
.x6_parse = connmark_parse,
.x6_options = connmark_mt_opts,
.xlate = connmark_xlate,
},
{
.version = XTABLES_VERSION,
.name = "connmark",
.revision = 1,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_connmark_mtinfo1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_mtinfo1)),
.help = connmark_mt_help,
.print = connmark_mt_print,
.save = connmark_mt_save,
.x6_parse = connmark_mt_parse,
.x6_options = connmark_mt_opts,
.xlate = connmark_mt_xlate,
},
};
void _init(void)
{
xtables_register_matches(connmark_mt_reg, ARRAY_SIZE(connmark_mt_reg));
}
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