/usr/src/xtables-addons-3.0/extensions/libxt_IPMARK.c is in xtables-addons-dkms 3.0-0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* "IPMARK" target extension for iptables
* Copyright © Grzegorz Janoszka <Grzegorz.Janoszka@pro.onet.pl>, 2003
* Jan Engelhardt, 2008
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or any later version, as published by the
* Free Software Foundation.
*/
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xtables.h>
#include "xt_IPMARK.h"
#include "compat_user.h"
enum {
FL_ADDR_USED = 1 << 0,
FL_AND_MASK_USED = 1 << 1,
FL_OR_MASK_USED = 1 << 2,
FL_SHIFT = 1 << 3,
};
/* Function which prints out usage message. */
static void ipmark_tg_help(void)
{
printf(
"IPMARK target options:\n"
" --addr {src|dst} use source or destination ip address\n"
" --and-mask value logical AND ip address with this value becomes MARK\n"
" --or-mask value logical OR ip address with this value becomes MARK\n"
" --shift value shift address right by value before copying to mark\n"
"\n");
}
static const struct option ipmark_tg_opts[] = {
{.name = "addr", .has_arg = true, .val = '1'},
{.name = "and-mask", .has_arg = true, .val = '2'},
{.name = "or-mask", .has_arg = true, .val = '3'},
{.name = "shift", .has_arg = true, .val = '4'},
{NULL},
};
/* Initialize the target. */
static void ipmark_tg_init(struct xt_entry_target *t)
{
struct xt_ipmark_tginfo *info = (void *)t->data;
info->andmask = ~0U;
}
static int ipmark_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_ipmark_tginfo *info = (void *)(*target)->data;
unsigned int n;
switch (c) {
case '1':
xtables_param_act(XTF_ONLY_ONCE, "IPMARK", "addr", *flags & FL_ADDR_USED);
xtables_param_act(XTF_NO_INVERT, "IPMARK", "addr", invert);
if (strcmp(optarg, "src") == 0)
info->selector = XT_IPMARK_SRC;
else if (strcmp(optarg, "dst") == 0)
info->selector = XT_IPMARK_DST;
else
xtables_error(PARAMETER_PROBLEM, "Bad addr value `%s' - should be `src' or `dst'", optarg);
*flags |= FL_ADDR_USED;
return true;
case '2':
xtables_param_act(XTF_ONLY_ONCE, "IPMARK", "and-mask", *flags & FL_AND_MASK_USED);
xtables_param_act(XTF_NO_INVERT, "IPMARK", "and-mask", invert);
if (!xtables_strtoui(optarg, NULL, &n, 0, ~0U))
xtables_param_act(XTF_BAD_VALUE, "IPMARK", "and-mask", optarg);
info->andmask = n;
*flags |= FL_AND_MASK_USED;
return true;
case '3':
xtables_param_act(XTF_ONLY_ONCE, "IPMARK", "or-mask", *flags & FL_OR_MASK_USED);
xtables_param_act(XTF_NO_INVERT, "IPMARK", "or-mask", invert);
if (!xtables_strtoui(optarg, NULL, &n, 0, ~0U))
xtables_param_act(XTF_BAD_VALUE, "IPMARK", "or-mask", optarg);
info->ormask = n;
*flags |= FL_OR_MASK_USED;
return true;
case '4':
xtables_param_act(XTF_ONLY_ONCE, "IPMARK", "--shift", *flags & FL_SHIFT);
xtables_param_act(XTF_NO_INVERT, "IPMARK", "--shift", invert);
/*
* Anything >31 does not make sense for IPv4, but it still
* does the right thing.
*/
if (!xtables_strtoui(optarg, NULL, &n, 0, 128))
xtables_param_act(XTF_BAD_VALUE, "IPMARK", "--shift", optarg);
info->shift = n;
*flags |= FL_SHIFT;
return true;
}
return false;
}
static void ipmark_tg_check(unsigned int flags)
{
if (!(flags & FL_ADDR_USED))
xtables_error(PARAMETER_PROBLEM,
"IPMARK target: Parameter --addr is required");
}
static void
ipmark_tg_save(const void *entry, const struct xt_entry_target *target)
{
const struct xt_ipmark_tginfo *info = (const void *)target->data;
if (info->selector == XT_IPMARK_SRC)
printf(" --addr src ");
else
printf(" --addr dst ");
if (info->shift != 0)
printf(" --shift %u ", (unsigned int)info->shift);
if (info->andmask != ~0U)
printf(" --and-mask 0x%x ", (unsigned int)info->andmask);
if (info->ormask != 0)
printf(" --or-mask 0x%x ", (unsigned int)info->ormask);
}
static void
ipmark_tg_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
printf(" -j IPMARK");
ipmark_tg_save(entry, target);
}
static struct xtables_target ipmark_tg_reg = {
.version = XTABLES_VERSION,
.name = "IPMARK",
.family = NFPROTO_UNSPEC,
.revision = 1,
.size = XT_ALIGN(sizeof(struct xt_ipmark_tginfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_ipmark_tginfo)),
.help = ipmark_tg_help,
.init = ipmark_tg_init,
.parse = ipmark_tg_parse,
.final_check = ipmark_tg_check,
.print = ipmark_tg_print,
.save = ipmark_tg_save,
.extra_opts = ipmark_tg_opts,
};
static __attribute__((constructor)) void ipmark_tg_ldr(void)
{
xtables_register_target(&ipmark_tg_reg);
}
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