| /* |
| * 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/netfilter_bridge/ebtables.h> |
| #include <linux/netfilter_bridge/ebt_mark_t.h> |
| #include <linux/module.h> |
| |
| static int ebt_target_mark(struct sk_buff **pskb, unsigned int hooknr, |
| const struct net_device *in, const struct net_device *out, |
| const void *data, unsigned int datalen) |
| { |
| struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data; |
| int action = info->target & -16; |
| |
| 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 | -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; |
| tmp = info->target | -16; |
| if (BASE_CHAIN && tmp == EBT_RETURN) |
| return -EINVAL; |
| CLEAR_BASE_CHAIN_BIT; |
| 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; |
| } |
| |
| static struct ebt_target mark_target = |
| { |
| .name = EBT_MARK_TARGET, |
| .target = ebt_target_mark, |
| .check = ebt_target_mark_check, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init ebt_mark_init(void) |
| { |
| return ebt_register_target(&mark_target); |
| } |
| |
| static void __exit ebt_mark_fini(void) |
| { |
| ebt_unregister_target(&mark_target); |
| } |
| |
| module_init(ebt_mark_init); |
| module_exit(ebt_mark_fini); |
| MODULE_LICENSE("GPL"); |