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/* ebt_mark
*
* Authors:
* Bart De Schuymer <bdschuym@pandora.be>
*
* July, 2002, September 2006
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include "../include/ebtables_u.h"
#include <linux/netfilter_bridge/ebt_mark_t.h>
static int mark_supplied;
#define MARK_TARGET '1'
#define MARK_SETMARK '2'
#define MARK_ORMARK '3'
#define MARK_ANDMARK '4'
#define MARK_XORMARK '5'
static const struct option opts[] =
{
{ "mark-target" , required_argument, 0, MARK_TARGET },
/* an oldtime messup, we should have always used the scheme
* <extension-name>-<option> */
{ "set-mark" , required_argument, 0, MARK_SETMARK },
{ "mark-set" , required_argument, 0, MARK_SETMARK },
{ "mark-or" , required_argument, 0, MARK_ORMARK },
{ "mark-and" , required_argument, 0, MARK_ANDMARK },
{ "mark-xor" , required_argument, 0, MARK_XORMARK },
{ 0 }
};
static void print_help()
{
printf(
"mark target options:\n"
" --mark-set value : Set nfmark value\n"
" --mark-or value : Or nfmark with value (nfmark |= value)\n"
" --mark-and value : And nfmark with value (nfmark &= value)\n"
" --mark-xor value : Xor nfmark with value (nfmark ^= value)\n"
" --mark-target target : ACCEPT, DROP, RETURN or CONTINUE\n");
}
static void init(struct ebt_entry_target *target)
{
struct ebt_mark_t_info *markinfo =
(struct ebt_mark_t_info *)target->data;
markinfo->target = EBT_ACCEPT;
markinfo->mark = 0;
mark_supplied = 0;
}
#define OPT_MARK_TARGET 0x01
#define OPT_MARK_SETMARK 0x02
#define OPT_MARK_ORMARK 0x04
#define OPT_MARK_ANDMARK 0x08
#define OPT_MARK_XORMARK 0x10
static int parse(int c, char **argv, int argc,
const struct ebt_u_entry *entry, unsigned int *flags,
struct ebt_entry_target **target)
{
struct ebt_mark_t_info *markinfo =
(struct ebt_mark_t_info *)(*target)->data;
char *end;
switch (c) {
case MARK_TARGET:
{ int tmp;
ebt_check_option2(flags, OPT_MARK_TARGET);
if (FILL_TARGET(optarg, tmp))
ebt_print_error2("Illegal --mark-target target");
/* the 4 lsb are left to designate the target */
markinfo->target = (markinfo->target & ~EBT_VERDICT_BITS) | (tmp & EBT_VERDICT_BITS);
}
return 1;
case MARK_SETMARK:
ebt_check_option2(flags, OPT_MARK_SETMARK);
if (*flags & (OPT_MARK_ORMARK|OPT_MARK_ANDMARK|OPT_MARK_XORMARK))
ebt_print_error2("--mark-set cannot be used together with specific --mark option");
break;
case MARK_ORMARK:
ebt_check_option2(flags, OPT_MARK_ORMARK);
if (*flags & (OPT_MARK_SETMARK|OPT_MARK_ANDMARK|OPT_MARK_XORMARK))
ebt_print_error2("--mark-or cannot be used together with specific --mark option");
markinfo->target = (markinfo->target & EBT_VERDICT_BITS) | MARK_OR_VALUE;
break;
case MARK_ANDMARK:
ebt_check_option2(flags, OPT_MARK_ANDMARK);
if (*flags & (OPT_MARK_SETMARK|OPT_MARK_ORMARK|OPT_MARK_XORMARK))
ebt_print_error2("--mark-and cannot be used together with specific --mark option");
markinfo->target = (markinfo->target & EBT_VERDICT_BITS) | MARK_AND_VALUE;
break;
case MARK_XORMARK:
ebt_check_option2(flags, OPT_MARK_XORMARK);
if (*flags & (OPT_MARK_SETMARK|OPT_MARK_ANDMARK|OPT_MARK_ORMARK))
ebt_print_error2("--mark-xor cannot be used together with specific --mark option");
markinfo->target = (markinfo->target & EBT_VERDICT_BITS) | MARK_XOR_VALUE;
break;
default:
return 0;
}
/* mutual code */
markinfo->mark = strtoul(optarg, &end, 0);
if (*end != '\0' || end == optarg)
ebt_print_error2("Bad MARK value '%s'", optarg);
mark_supplied = 1;
return 1;
}
static void final_check(const struct ebt_u_entry *entry,
const struct ebt_entry_target *target, const char *name,
unsigned int hookmask, unsigned int time)
{
struct ebt_mark_t_info *markinfo =
(struct ebt_mark_t_info *)target->data;
if (time == 0 && mark_supplied == 0) {
ebt_print_error("No mark value supplied");
} else if (BASE_CHAIN && (markinfo->target|~EBT_VERDICT_BITS) == EBT_RETURN)
ebt_print_error("--mark-target RETURN not allowed on base chain");
}
static void print(const struct ebt_u_entry *entry,
const struct ebt_entry_target *target)
{
struct ebt_mark_t_info *markinfo =
(struct ebt_mark_t_info *)target->data;
int tmp;
tmp = markinfo->target & ~EBT_VERDICT_BITS;
if (tmp == MARK_SET_VALUE)
printf("--mark-set");
else if (tmp == MARK_OR_VALUE)
printf("--mark-or");
else if (tmp == MARK_XOR_VALUE)
printf("--mark-xor");
else if (tmp == MARK_AND_VALUE)
printf("--mark-and");
else
ebt_print_error("oops, unknown mark action, try a later version of ebtables");
printf(" 0x%lx", markinfo->mark);
tmp = markinfo->target | ~EBT_VERDICT_BITS;
printf(" --mark-target %s", TARGET_NAME(tmp));
}
static int compare(const struct ebt_entry_target *t1,
const struct ebt_entry_target *t2)
{
struct ebt_mark_t_info *markinfo1 =
(struct ebt_mark_t_info *)t1->data;
struct ebt_mark_t_info *markinfo2 =
(struct ebt_mark_t_info *)t2->data;
return markinfo1->target == markinfo2->target &&
markinfo1->mark == markinfo2->mark;
}
static struct ebt_u_target mark_target =
{
.name = "mark",
.size = sizeof(struct ebt_mark_t_info),
.help = print_help,
.init = init,
.parse = parse,
.final_check = final_check,
.print = print,
.compare = compare,
.extra_ops = opts,
};
void _init(void)
{
ebt_register_target(&mark_target);
}
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