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[NETFILTER]: ebt_mark: add or/and/xor action support to mark target

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The following patch adds or/and/xor functionality for the mark target,
while staying backwards compatible.

Signed-off-by: Bart De Schuymer <bdschuym@pandora.be>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bart De Schuymer 2006-10-02 16:12:52 -07:00 committed by David S. Miller
parent 9d02002d2d
commit b18dfa90c0
2 changed files with 29 additions and 4 deletions
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12
include/linux/netfilter_bridge/ebt_mark_t.h
View file

@ -1,6 +1,18 @@
#ifndef __LINUX_BRIDGE_EBT_MARK_T_H
#define __LINUX_BRIDGE_EBT_MARK_T_H
/* The target member is reused for adding new actions, the
* value of the real target is -1 to -NUM_STANDARD_TARGETS.
* For backward compatibility, the 4 lsb (2 would be enough,
* but let's play it safe) are kept to designate this target.
* The remaining bits designate the action. By making the set
* action 0xfffffff0, the result will look ok for older
* versions. [September 2006] */
#define MARK_SET_VALUE (0xfffffff0)
#define MARK_OR_VALUE (0xffffffe0)
#define MARK_AND_VALUE (0xffffffd0)
#define MARK_XOR_VALUE (0xffffffc0)
struct ebt_mark_t_info
{
unsigned long mark;

21
net/bridge/netfilter/ebt_mark.c
View file

@ -22,24 +22,37 @@ static int ebt_target_mark(struct sk_buff **pskb, unsigned int hooknr,
const void *data, unsigned int datalen)
{
struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
int action = info->target & -16;
if ((*pskb)->nfmark != info->mark)
if (action == MARK_SET_VALUE)
(*pskb)->nfmark = info->mark;
else if (action == MARK_OR_VALUE)
(*pskb)->nfmark |= info->mark;
else if (action == MARK_AND_VALUE)
(*pskb)->nfmark &= info->mark;
else
(*pskb)->nfmark ^= info->mark;
return info->target;
return info->target | -16;
}
static int ebt_target_mark_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
int tmp;
if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_t_info)))
return -EINVAL;
if (BASE_CHAIN && info->target == EBT_RETURN)
tmp = info->target | -16;
if (BASE_CHAIN && tmp == EBT_RETURN)
return -EINVAL;
CLEAR_BASE_CHAIN_BIT;
if (INVALID_TARGET)
if (tmp < -NUM_STANDARD_TARGETS || tmp >= 0)
return -EINVAL;
tmp = info->target & -16;
if (tmp != MARK_SET_VALUE && tmp != MARK_OR_VALUE &&
tmp != MARK_AND_VALUE && tmp != MARK_XOR_VALUE)
return -EINVAL;
return 0;
}