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/*
* ebt_mark
*
* Authors:
* Bart De Schuymer <bdschuym@pandora.be>
*
* July, 2002
*
*/
/* The mark target can be used in any chain,
* I believe adding a mangle table just for marking is total overkill.
* Marking a frame doesn't really change anything in the frame anyway.
*/
#include <linux/module.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_mark_t.h>
static unsigned int
ebt_mark_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
const struct ebt_mark_t_info *info = par->targinfo;
int action = info->target & -16;
if (action == MARK_SET_VALUE)
skb->mark = info->mark;
else if (action == MARK_OR_VALUE)
skb->mark |= info->mark;
else if (action == MARK_AND_VALUE)
skb->mark &= info->mark;
else
skb->mark ^= info->mark;
return info->target | ~EBT_VERDICT_BITS;
}
static bool ebt_mark_tg_check(const struct xt_tgchk_param *par)
{
const struct ebt_mark_t_info *info = par->targinfo;
int tmp;
tmp = info->target | ~EBT_VERDICT_BITS;
if (BASE_CHAIN && tmp == EBT_RETURN)
return false;
if (tmp < -NUM_STANDARD_TARGETS || tmp >= 0)
return false;
tmp = info->target & ~EBT_VERDICT_BITS;
if (tmp != MARK_SET_VALUE && tmp != MARK_OR_VALUE &&
tmp != MARK_AND_VALUE && tmp != MARK_XOR_VALUE)
return false;
return true;
}
static struct xt_target ebt_mark_tg_reg __read_mostly = {
.name = "mark",
.revision = 0,
.family = NFPROTO_BRIDGE,
.target = ebt_mark_tg,
.checkentry = ebt_mark_tg_check,
.targetsize = XT_ALIGN(sizeof(struct ebt_mark_t_info)),
.me = THIS_MODULE,
};
static int __init ebt_mark_init(void)
{
return xt_register_target(&ebt_mark_tg_reg);
}
static void __exit ebt_mark_fini(void)
{
xt_unregister_target(&ebt_mark_tg_reg);
}
module_init(ebt_mark_init);
module_exit(ebt_mark_fini);
MODULE_DESCRIPTION("Ebtables: Packet mark modification");
MODULE_LICENSE("GPL");
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