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/* Shared library add-on to iptables to add MARK target support. */
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_MARK.h>
/* Version 0 */
struct xt_mark_target_info {
unsigned long mark;
};
/* Version 1 */
enum {
XT_MARK_SET=0,
XT_MARK_AND,
XT_MARK_OR,
};
struct xt_mark_target_info_v1 {
unsigned long mark;
u_int8_t mode;
};
enum {
F_MARK = 1 << 0,
};
static void MARK_help(void)
{
printf(
"MARK target options:\n"
" --set-mark value Set nfmark value\n"
" --and-mark value Binary AND the nfmark with value\n"
" --or-mark value Binary OR the nfmark with value\n");
}
static const struct option MARK_opts[] = {
{ "set-mark", 1, NULL, '1' },
{ "and-mark", 1, NULL, '2' },
{ "or-mark", 1, NULL, '3' },
{ .name = NULL }
};
static const struct option mark_tg_opts[] = {
{.name = "set-xmark", .has_arg = true, .val = 'X'},
{.name = "set-mark", .has_arg = true, .val = '='},
{.name = "and-mark", .has_arg = true, .val = '&'},
{.name = "or-mark", .has_arg = true, .val = '|'},
{.name = "xor-mark", .has_arg = true, .val = '^'},
{ .name = NULL }
};
static void mark_tg_help(void)
{
printf(
"MARK target options:\n"
" --set-xmark value[/mask] Clear bits in mask and XOR value into nfmark\n"
" --set-mark value[/mask] Clear bits in mask and OR value into nfmark\n"
" --and-mark bits Binary AND the nfmark with bits\n"
" --or-mark bits Binary OR the nfmark with bits\n"
" --xor-mask bits Binary XOR the nfmark with bits\n"
"\n");
}
/* Function which parses command options; returns true if it
ate an option */
static int
MARK_parse_v0(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_mark_target_info *markinfo
= (struct xt_mark_target_info *)(*target)->data;
unsigned int mark = 0;
switch (c) {
case '1':
if (!xtables_strtoui(optarg, NULL, &mark, 0, UINT32_MAX))
xtables_error(PARAMETER_PROBLEM, "Bad MARK value \"%s\"", optarg);
markinfo->mark = mark;
if (*flags)
xtables_error(PARAMETER_PROBLEM,
"MARK target: Can't specify --set-mark twice");
*flags = 1;
break;
case '2':
xtables_error(PARAMETER_PROBLEM,
"MARK target: kernel too old for --and-mark");
case '3':
xtables_error(PARAMETER_PROBLEM,
"MARK target: kernel too old for --or-mark");
default:
return 0;
}
return 1;
}
static void MARK_check(unsigned int flags)
{
if (!flags)
xtables_error(PARAMETER_PROBLEM,
"MARK target: Parameter --set/and/or-mark"
" is required");
}
static int
MARK_parse_v1(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_mark_target_info_v1 *markinfo
= (struct xt_mark_target_info_v1 *)(*target)->data;
unsigned int mark = 0;
switch (c) {
case '1':
markinfo->mode = XT_MARK_SET;
break;
case '2':
markinfo->mode = XT_MARK_AND;
break;
case '3':
markinfo->mode = XT_MARK_OR;
break;
default:
return 0;
}
if (!xtables_strtoui(optarg, NULL, &mark, 0, UINT32_MAX))
xtables_error(PARAMETER_PROBLEM, "Bad MARK value \"%s\"", optarg);
markinfo->mark = mark;
if (*flags)
xtables_error(PARAMETER_PROBLEM,
"MARK target: Can't specify --set-mark twice");
*flags = 1;
return 1;
}
static int mark_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_mark_tginfo2 *info = (void *)(*target)->data;
unsigned int value, mask = UINT32_MAX;
char *end;
switch (c) {
case 'X': /* --set-xmark */
case '=': /* --set-mark */
xtables_param_act(XTF_ONE_ACTION, "MARK", *flags & F_MARK);
xtables_param_act(XTF_NO_INVERT, "MARK", "--set-xmark/--set-mark", invert);
if (!xtables_strtoui(optarg, &end, &value, 0, UINT32_MAX))
xtables_param_act(XTF_BAD_VALUE, "MARK", "--set-xmark/--set-mark", optarg);
if (*end == '/')
if (!xtables_strtoui(end + 1, &end, &mask, 0, UINT32_MAX))
xtables_param_act(XTF_BAD_VALUE, "MARK", "--set-xmark/--set-mark", optarg);
if (*end != '\0')
xtables_param_act(XTF_BAD_VALUE, "MARK", "--set-xmark/--set-mark", optarg);
info->mark = value;
info->mask = mask;
if (c == '=')
info->mask = value | mask;
break;
case '&': /* --and-mark */
xtables_param_act(XTF_ONE_ACTION, "MARK", *flags & F_MARK);
xtables_param_act(XTF_NO_INVERT, "MARK", "--and-mark", invert);
if (!xtables_strtoui(optarg, NULL, &mask, 0, UINT32_MAX))
xtables_param_act(XTF_BAD_VALUE, "MARK", "--and-mark", optarg);
info->mark = 0;
info->mask = ~mask;
break;
case '|': /* --or-mark */
xtables_param_act(XTF_ONE_ACTION, "MARK", *flags & F_MARK);
xtables_param_act(XTF_NO_INVERT, "MARK", "--or-mark", invert);
if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
xtables_param_act(XTF_BAD_VALUE, "MARK", "--or-mark", optarg);
info->mark = value;
info->mask = value;
break;
case '^': /* --xor-mark */
xtables_param_act(XTF_ONE_ACTION, "MARK", *flags & F_MARK);
xtables_param_act(XTF_NO_INVERT, "MARK", "--xor-mark", invert);
if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
xtables_param_act(XTF_BAD_VALUE, "MARK", "--xor-mark", optarg);
info->mark = value;
info->mask = 0;
break;
default:
return false;
}
*flags |= F_MARK;
return true;
}
static void mark_tg_check(unsigned int flags)
{
if (flags == 0)
xtables_error(PARAMETER_PROBLEM, "MARK: One of the --set-xmark, "
"--{and,or,xor,set}-mark options is required");
}
static void
print_mark(unsigned long mark)
{
printf("0x%lx ", mark);
}
static void MARK_print_v0(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct xt_mark_target_info *markinfo =
(const struct xt_mark_target_info *)target->data;
printf("MARK set ");
print_mark(markinfo->mark);
}
static void MARK_save_v0(const void *ip, const struct xt_entry_target *target)
{
const struct xt_mark_target_info *markinfo =
(const struct xt_mark_target_info *)target->data;
printf("--set-mark ");
print_mark(markinfo->mark);
}
static void MARK_print_v1(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_mark_target_info_v1 *markinfo =
(const struct xt_mark_target_info_v1 *)target->data;
switch (markinfo->mode) {
case XT_MARK_SET:
printf("MARK set ");
break;
case XT_MARK_AND:
printf("MARK and ");
break;
case XT_MARK_OR:
printf("MARK or ");
break;
}
print_mark(markinfo->mark);
}
static void mark_tg_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_mark_tginfo2 *info = (const void *)target->data;
if (info->mark == 0)
printf("MARK and 0x%x ", (unsigned int)(u_int32_t)~info->mask);
else if (info->mark == info->mask)
printf("MARK or 0x%x ", info->mark);
else if (info->mask == 0)
printf("MARK xor 0x%x ", info->mark);
else if (info->mask == 0xffffffffU)
printf("MARK set 0x%x ", info->mark);
else
printf("MARK xset 0x%x/0x%x ", info->mark, info->mask);
}
static void MARK_save_v1(const void *ip, const struct xt_entry_target *target)
{
const struct xt_mark_target_info_v1 *markinfo =
(const struct xt_mark_target_info_v1 *)target->data;
switch (markinfo->mode) {
case XT_MARK_SET:
printf("--set-mark ");
break;
case XT_MARK_AND:
printf("--and-mark ");
break;
case XT_MARK_OR:
printf("--or-mark ");
break;
}
print_mark(markinfo->mark);
}
static void mark_tg_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_mark_tginfo2 *info = (const void *)target->data;
printf("--set-xmark 0x%x/0x%x ", info->mark, info->mask);
}
static struct xtables_target mark_tg_reg[] = {
{
.family = NFPROTO_UNSPEC,
.name = "MARK",
.version = XTABLES_VERSION,
.revision = 0,
.size = XT_ALIGN(sizeof(struct xt_mark_target_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_mark_target_info)),
.help = MARK_help,
.parse = MARK_parse_v0,
.final_check = MARK_check,
.print = MARK_print_v0,
.save = MARK_save_v0,
.extra_opts = MARK_opts,
},
{
.family = NFPROTO_IPV4,
.name = "MARK",
.version = XTABLES_VERSION,
.revision = 1,
.size = XT_ALIGN(sizeof(struct xt_mark_target_info_v1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_mark_target_info_v1)),
.help = MARK_help,
.parse = MARK_parse_v1,
.final_check = MARK_check,
.print = MARK_print_v1,
.save = MARK_save_v1,
.extra_opts = MARK_opts,
},
{
.version = XTABLES_VERSION,
.name = "MARK",
.revision = 2,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_mark_tginfo2)),
.userspacesize = XT_ALIGN(sizeof(struct xt_mark_tginfo2)),
.help = mark_tg_help,
.parse = mark_tg_parse,
.final_check = mark_tg_check,
.print = mark_tg_print,
.save = mark_tg_save,
.extra_opts = mark_tg_opts,
},
};
void _init(void)
{
xtables_register_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
}
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